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CN113803279A - Axial flow fan - Google Patents

Axial flow fan Download PDF

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Publication number
CN113803279A
CN113803279A CN202110643118.6A CN202110643118A CN113803279A CN 113803279 A CN113803279 A CN 113803279A CN 202110643118 A CN202110643118 A CN 202110643118A CN 113803279 A CN113803279 A CN 113803279A
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CN
China
Prior art keywords
impeller
flow fan
axial flow
axial
wall portion
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202110643118.6A
Other languages
Chinese (zh)
Inventor
吉野慎吾
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nidec Corp
Original Assignee
Nidec Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from JP2020149400A external-priority patent/JP2021195943A/en
Application filed by Nidec Corp filed Critical Nidec Corp
Publication of CN113803279A publication Critical patent/CN113803279A/en
Pending legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D25/00—Pumping installations or systems
    • F04D25/02—Units comprising pumps and their driving means
    • F04D25/08—Units comprising pumps and their driving means the working fluid being air, e.g. for ventilation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D19/00—Axial-flow pumps
    • F04D19/002—Axial flow fans
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/32—Rotors specially for elastic fluids for axial flow pumps
    • F04D29/325—Rotors specially for elastic fluids for axial flow pumps for axial flow fans
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/32—Rotors specially for elastic fluids for axial flow pumps
    • F04D29/38—Blades
    • F04D29/388—Blades characterised by construction
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
    • F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
    • F04D29/663—Sound attenuation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
    • F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
    • F04D29/666—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps by means of rotor construction or layout, e.g. unequal distribution of blades or vanes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
    • F04D29/661—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
    • F04D29/668—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps damping or preventing mechanical vibrations

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

本发明提供轴流风扇。轴流风扇具有：马达，其具有沿上下方向延伸的中心轴线；以及叶轮，其具有多个叶片，并且该叶轮以中心轴线为中心通过马达的旋转而产生空气的流动。马达具有定子部和与定子部对置地进行旋转的转子部。叶轮具有固定于转子部的叶轮杯。叶轮杯具有在与中心轴线交叉的方向上扩展的顶板部和从顶板部向下方延伸的侧面部。叶片从侧面部向径向外侧延伸，具有位于旋转方向最后方的后缘部和位于旋转方向最前方的前缘部。叶片从后缘部朝向前缘部从下方向上方倾斜，前缘部位于比顶板部靠上侧的位置，在前缘部与叶轮杯之间配置有壁部。

Figure 202110643118

The present invention provides an axial flow fan. An axial flow fan includes a motor having a central axis extending in the up-down direction, and an impeller having a plurality of blades, and the impeller generates a flow of air by rotation of the motor around the central axis. The motor includes a stator portion and a rotor portion that rotates facing the stator portion. The impeller has an impeller cup fixed to the rotor portion. The impeller cup has a top plate portion extending in a direction intersecting the central axis, and a side surface portion extending downward from the top plate portion. The vane extends radially outward from the side surface portion, and has a trailing edge portion located rearmost in the rotational direction and a leading edge portion located furthest forward in the rotational direction. The vanes are inclined upward from the bottom toward the leading edge from the trailing edge portion, the leading edge portion is positioned above the top plate portion, and a wall portion is arranged between the leading edge portion and the impeller cup.

Figure 202110643118

Description

Axial flow fan
Technical Field
The present invention relates to an axial fan.
Background
Conventionally, in a fan motor in which an axial flow fan and a motor are integrated, there is known a structure including: a hub provided with a motor therein; a plurality of blades mounted on the hub; and a fan housing formed to surround the blades.
Patent document 1: japanese laid-open patent publication No. 2002-
In the conventional axial flow fan, the blades and the fan casing are deformed by vibration of the motor and flow of wind when the fan motor is driven, and the deformation becomes a main cause of vibration and noise. In particular, in an axial flow fan for use in home electric appliances, etc., it is required to reduce vibration and noise.
Disclosure of Invention
An object of the present invention is to provide an axial fan in which vibration and noise are reduced at the time of driving.
An exemplary axial flow fan of the present invention has: a motor having a central axis extending in an up-down direction; and an impeller having a plurality of blades, and generating a flow of air by rotation of the motor centering on the central axis. The motor includes a stator portion and a rotor portion that rotates in opposition to the stator portion. The impeller has an impeller cup fixed to the rotor portion. The impeller cup has a top plate portion extending in a direction intersecting the center axis, and a side surface portion extending downward from the top plate portion. The blade extends radially outward from the side surface portion, and has a trailing edge portion positioned furthest rearward in the rotational direction and a leading edge portion positioned furthest forward in the rotational direction. The blade is inclined upward from the rear edge portion toward the front edge portion, the front edge portion is located above the top plate portion, and a wall portion is disposed between the front edge portion and the impeller cup.
According to the exemplary axial flow fan of the present invention, vibration and noise can be reduced.
The above and other features, elements, steps, characteristics and advantages of the present invention will become apparent from the following detailed description of preferred embodiments of the present invention and the accompanying drawings.
Drawings
Fig. 1 is an overall perspective view showing an axial flow fan 50 according to embodiment 1 of the present invention.
Fig. 2 is a longitudinal sectional view of an axial flow fan 50 according to embodiment 1 of the present invention.
Fig. 3 is a perspective view showing an impeller 1 according to embodiment 1 of the present invention.
Fig. 4 is a plan view of axial flow fan 50 according to embodiment 1 of the present invention as viewed from the exhaust port side.
Fig. 5 is a perspective view showing an impeller 1A according to embodiment 2 of the present invention.
Fig. 6 is a graph showing characteristics of the impeller 1A according to embodiment 2 of the present invention.
Fig. 7 is a perspective view showing an impeller 1B according to embodiment 3 of the present invention.
Fig. 8 is a side view showing an impeller 1B according to embodiment 3 of the present invention.
Fig. 9 is a side view showing an axial flow fan 50B according to embodiment 3 of the present invention.
Fig. 10 is a graph showing characteristics of the impeller 1B according to embodiment 3 of the present invention.
Detailed Description
Hereinafter, exemplary embodiments of the present invention will be described with reference to the drawings. In the following description relating to the structure of the axial flow fan, the direction in which the rotation axis in which the impeller rotates extends is referred to as the "vertical direction". The radial direction centered on the rotation axis is simply referred to as "radial direction", and the circumferential direction centered on the rotation axis is simply referred to as "circumferential direction". However, the vertical direction does not indicate a positional relationship and a direction when the device is incorporated into an actual apparatus.
First, the overall structure of an axial flow fan according to embodiment 1 of the present invention will be described with reference to fig. 1 to 4. Fig. 1 is an overall perspective view showing an axial flow fan 50 according to embodiment 1 of the present invention. Fig. 2 is a longitudinal sectional view of an axial flow fan 50 according to embodiment 1 of the present invention. Fig. 3 is a perspective view showing an impeller 1 according to embodiment 1 of the present invention. Fig. 4 is a plan view of axial flow fan 50 according to embodiment 1 of the present invention as viewed from the exhaust port side.
The axial fan 50 includes an impeller 1, a motor 2, and a casing 3.
The casing 3 is disposed radially outward of the impeller 1. The housing 3 has a motor base portion 31, a frame portion 32, and a connecting rib 33. The motor base part 31 supports the motor 2. The frame portion 32 is located radially outward of the motor base portion 31. The connecting ribs 33 connect the motor base portion 31 and the frame portion 32. The housing 3 is made of a resin material, and the motor base portion 31, the frame portion 32, and the connection ribs 33 are made of a resin material as the same member.
The motor 2 rotationally drives the impeller 1 about the center axis C1. The motor 2 includes a stator portion 21, a rotor portion 22 that rotates to face the stator portion 21, a bearing portion 23, a shaft 24, and a circuit board 25.
The motor base part 31 supports the motor 2. The motor base part 31 has a base part 311 expanding in the radial direction on the lower surface side and a bearing holding part 312 protruding upward from the central part of the base part 311. The bearing holding portion 312 accommodates the cylindrical bearing portion 23 therein and holds the bearing portion 23. The bearing portion 23 is, for example, a sleeve bearing. The bearing portions 23 may be a pair of ball bearings arranged vertically.
The shaft 24 is a columnar member extending in the vertical direction, and is made of metal such as stainless steel, for example. The bearing portion 23 can hold the shaft 24 to rotate about the center axis C1.
The stator portion 21 is fixed to the outer peripheral surface of the bearing holding portion 312. The stator portion 21 includes a stator core 211, an insulating member (not shown) made of insulating resin, and a coil 213. The stator core 211 is formed of a laminated steel plate in which electromagnetic steel plates such as silicon steel plates are laminated in the vertical direction. The coil 213 is provided by winding a wire around the stator core 211 with an insulator interposed therebetween.
A circuit board 25 is disposed below the stator portion 21. The circuit board 25 is a board on which an electronic circuit for supplying a driving current to the coil 213 is mounted. The lead wire of the coil 213 is electrically connected to the circuit board 25.
The rotor portion 22 has a rotor yoke 221 and a magnet 222. The rotor yoke 221 is a substantially cylindrical member and is formed of a magnetic body. A cylindrical magnet 222 is fixed to an inner peripheral surface of the rotor yoke 221. The magnet 222 is disposed radially outward of the stator portion 21. The magnetic pole surfaces on the inner circumferential side of the magnet 222 are arranged such that N poles and S poles alternate in the circumferential direction. By forming a magnetic path between rotor yoke 221 and magnet 222, leakage flux from magnet 222 to the outside of axial fan 50 can be reduced.
The impeller 1 is made of a resin material, and has an impeller cup 11 and a plurality of blades 12. The impeller cup 11 is a substantially cylindrical member having a cover at the upper part, and more specifically, has a top plate 111 extending in a direction intersecting the center axis C1, and a side surface 112 extending downward from the top plate 111. A rotor yoke 221 is fixed to the inside of the side surface portion 112. A plurality of blades 12 are formed radially outward of the side surface portion 112. In the present embodiment, as an example, 3 blades 12 are arranged at equal intervals in the circumferential direction as shown in fig. 4 in particular. The shaft 24 is fixed to the top plate 111.
In the axial flow fan 50 configured as described above, when a drive current is applied to the coil 213 of the stator portion 21, a magnetic flux in the radial direction is generated in the stator core 211. Then, a circumferential torque is generated by the action of magnetic flux between the stator core 211 and the magnet 222. As a result, the rotating portion constituted by the rotor portion 22 and the impeller 1 rotates about the central axis C1.
When the impeller 1 rotates, an air flow is generated by the plurality of blades 12. That is, air flow is generated with the upper side of the axial fan 50 as the intake side and the lower side as the exhaust side, and air can be blown.
The blade 12 extends radially outward from the side surface portion 112. Further, the blade 12 has a leading edge portion 121 positioned at the forefront in the rotation direction and a trailing edge portion 122 positioned at the rearmost in the rotation direction, and the blade 12 is shaped so as to be inclined upward from the trailing edge portion 122 toward the leading edge portion 121 from below.
By reducing the axial height of the motor 2, the length of the side surface portion 112 of the impeller cup 11 can be reduced, and as a result, the amount of resin used can be reduced. However, when the blades 12 are formed at the same angle, if the top plate and the front edge of the impeller cup are located at the same position as in the conventional impeller, the circumferential length of the blades 12 becomes short, and as a result, the air volume decreases. Since the leading edge 121 is located above the top plate 111, the circumferential length of the blade can be maintained, and the air volume can be ensured.
A wall portion 123 extending from the front edge portion 121 to the top plate portion 111 is provided. More specifically, the wall portion 123 extends in the axial direction from the outer edge of the top plate portion 111, and is connected to the surface of the blade 12 on the impeller cup 11 side from the front edge portion 121 to the rear edge portion 122.
When the leading edge portion 121 is not connected to the top plate portion 111, the leading edge portion 121 vibrates when the impeller 1 rotates, which causes noise, because the rigidity of the blade 12 is weak. By providing the wall portion 123, the rigidity of the leading edge portion 121 can be improved, and vibration and noise during rotation of the impeller 1 can be reduced.
The radially inward surface of the wall portion 123 is curved in the circumferential direction. This allows air to flow smoothly along the curved wall portion 123 when the impeller 1 rotates, and prevents turbulence from occurring in the wall portion 123 when the impeller rotates.
A radially outward surface of the wall portion 123 extends in the axial direction so as to be flush with the side surface portion 112 of the impeller cup 11. Thus, when the impeller 1 rotates, air flows smoothly along the curved wall portion 123, and turbulence is prevented from being generated in the wall portion 123 when rotating.
The top plate 111 has a groove 1111 recessed downward in the axial direction. The groove 1111 is located radially inward of a radially inward surface of the wall portion 123. A balancer (not shown) for correcting the balance of the impeller 1 is disposed in the groove 1111. By disposing the groove 1111 of the top plate 111 inside the wall portion 123, balance correction can be easily performed.
Next, the structure of the housing 3 will be described in detail with reference to fig. 4.
The frame portion 32 has an inner wall portion 321 extending in the axial direction, and the inner wall portion 321 has an air inlet on the upper side in the axial direction and an air outlet on the lower side in the axial direction. The inner wall 321 is formed in a cylindrical shape so that an inner peripheral surface thereof faces an outer edge portion of the blade 12 and so that wind flows in an axial direction inside. The inner wall 321 is connected to the connecting rib 33.
Frame portion 32 has an outer wall portion 322 extending in the axial direction, and outer wall portion 322 is located radially outward of inner wall portion 321. The outer wall portion 322 is rectangular when viewed from the axial direction. Having a1 st side 3221 and a2 nd side 3222 constituting the outer wall portion 322. Side 1 3221 and side 2 3222 are connected to each other at right angles. A fixing portion 323 is provided at a corner portion formed by the 1 st side 3221 and the 2 nd side 3222. The fixing portion 323 has a through hole 3231 to which a screw or the like for fixing an actual device such as a home appliance is attached.
The inner wall 321 and the outer wall 322 are disposed separately. More specifically, the inner wall 321 and the outer wall 322 are open at one axial side. This can reduce the amount of resin used for the case 3. In order to reduce the amount of resin used for the housing 3, the housing may have a shape that penetrates in the axial direction.
A1 st rib 324 is provided between the inner wall 321 and the outer wall 322 to connect the inner wall 321 and the outer wall 322. In more detail, the 1 st rib 324 extends from the connection rib 33 in the same direction as the connection rib 33, and is connected to the 1 st side 3221. Also, the 1 st rib 324 is not connected to the fixing portion 323, i.e., is connected to the 1 st side 3221 at a position apart from the fixing portion 323.
When the motor is driven, the connection rib 33 is stressed by vibration of the motor 2 and wind pressure, and a force for deforming the inner wall 321 is applied. The deformation of the inner wall 321 causes the position of the motor 2 to move, that is, the motor 2 to vibrate, which causes noise of the axial flow fan. By providing the 1 st rib 324, the rigidity of the inner wall 321 is increased, and deformation of the inner wall 321 due to a force from the connecting rib 33 is reduced. As a result, since the position of the motor 2 is maintained, vibration and noise can be reduced.
The 2 nd rib 325 extending perpendicularly from the 1 st side 3221 toward the inner wall 321 is connected to the connecting rib 33 as viewed in the axial direction. The strength of the 1 st side 3221 is maintained by the 2 nd rib 325, reducing vibration.
The 3 rd rib 326 extending perpendicularly from the 2 nd side 3222 toward the inner wall 321 is connected to the inner wall 321 as viewed in the axial direction. The 3 rd rib 326 maintains the strength of the 2 nd side 3222 and the inner wall 321, thereby reducing vibration.
Next, embodiment 2, which is a modification of embodiment 1, will be described. Fig. 5 is a perspective view showing an impeller 1A according to embodiment 2 of the present invention. Fig. 6 is a graph showing characteristics of the impeller 1A according to embodiment 2 of the present invention.
The blade 12A of the impeller 1A includes: a thin-walled portion 125 having a short axial length; a thick portion 126 that is longer than the thin portion 125 in the axial direction on the leading edge portion 121A side; and a step portion 127 connecting the thin portion 125 and the thick portion 126.
Fig. 6 is a graph showing characteristics of the impeller 1A according to embodiment 2 of the present invention. More specifically, the present invention is a graph showing static pressure-air volume characteristics (P-Q curve) obtained by comparing the impeller 1A of the present invention (the present invention in the figure) with a conventional impeller (conventional art in the figure) having no thin portion 125, thick portion 126, and stepped portion 127. According to the graph of fig. 6, surge increases in the middle region a1 of the P-Q curve, which causes vibration and noise. By forming the impeller 1A in a distorted shape such that the axial length thereof becomes thinner from the leading edge portion 121A side toward the trailing edge portion 122A, the flow of wind flowing on the surface of the blade 12A is less likely to separate from the blade 12A, and the region where surging occurs in the intermediate region a1 of the P-Q curve can be reduced.
Further, the axial length of thick portion 126 becomes shorter from wall portion 123A toward outer edge 124A of blade 12A. That is, the outer edge portion 124A is formed in a streamline shape having the same length, i.e., the length from the leading edge portion 121A side to the trailing edge portion 122A.
The outer edge portion 124A has an action of preventing the reverse flow of wind by a slight gap from the inner peripheral portion of the casing 3, and is not a distorted shape but a streamline shape having the same length in order to give priority to the action.
Next, embodiment 3, which is a modification of embodiment 1, will be described. Fig. 7 is a perspective view showing an impeller 1B according to embodiment 3 of the present invention. Fig. 8 is a side view showing an impeller 1B according to embodiment 3 of the present invention. Fig. 9 is a side view showing an axial flow fan 50B according to embodiment 3 of the present invention. Fig. 10 is a graph showing characteristics of the impeller 1B according to embodiment 3 of the present invention.
As shown in fig. 7 and 8, the blade 1B has a blade end portion 128 extending in the axial direction downward on the trailing edge portion 122B side of the outer edge portion 124B of the blade 12B. When impeller 1B is viewed from the side, blade end 128 has a rectangular plate shape. As shown in fig. 9, the axial flow fan 50B further has a casing 3B. The casing 3B is disposed radially outward of the impeller 1B.
As shown in fig. 8, when the impeller 1B is viewed from the side, the blade end 128 is located between the axial upper end and the axial lower end of the impeller cup 11B. In more detail, the wing tip 128 is located within the housing 3B, as shown in fig. 9, in a position hidden by the housing 8.
Fig. 10 is a graph showing characteristics of the impeller 1B according to embodiment 3 of the present invention. More specifically, the graph shows static pressure-air volume characteristics (P-Q curve) obtained by comparing the impeller 1B of the present invention (the present invention in the figure) with a conventional impeller (conventional technique in the figure) having no blade end 128. According to the graph of fig. 10, the surge becomes large in the middle region a2 of the P-Q curve, which becomes a cause of vibration and noise. By providing the blade end 128 as in the impeller 1B of the present invention, the ventilation resistance with the inner peripheral portion of the casing 3 becomes large, and the backflow is less likely to occur. As a result, the region in the P-Q curve of fig. 10 where surging occurs can be reduced.
Further, the longer the length of the blade end 128, the smaller the region where surging occurs, but if the length of the blade end 128 is too long, the flow of wind in the blowing direction is also obstructed, and the blowing capability is lowered. By positioning the length of the blade tip portion 128 between the axial upper end and the axial lower end of the impeller cup 11B, surge and blowing performance can be balanced.
The present invention can be applied to, for example, an axial fan mounted on a refrigerator.

Claims (11)

1.一种轴流风扇，其具有：1. An axial flow fan having: 马达，其具有沿上下方向延伸的中心轴线；以及a motor having a central axis extending in an up-down direction; and 叶轮，其具有多个叶片，并且该叶轮以所述中心轴线为中心通过所述马达的旋转而产生空气的流动，An impeller having a plurality of blades, and the impeller generates a flow of air by the rotation of the motor about the central axis, 所述马达具有：The motor has: 定子部；以及the stator part; and 转子部，其与所述定子部对置地进行旋转，a rotor part that rotates facing the stator part, 所述叶轮具有固定于所述转子部的叶轮杯，The impeller has an impeller cup fixed to the rotor portion, 所述叶轮杯具有：The impeller cup has: 顶板部，其在与所述中心轴线交叉的方向上扩展；以及a top plate portion that expands in a direction intersecting the central axis; and 侧面部，其从所述顶板部向下方延伸，a side portion extending downward from the top plate portion, 所述叶片从所述侧面部向径向外侧延伸，The vane extends radially outward from the side portion, 所述叶片具有位于旋转方向最后方的后缘部和位于旋转方向最前方的前缘部，The blade has a trailing edge portion located rearmost in the rotational direction and a leading edge portion located furthest forward in the rotational direction, 其特征在于，It is characterized in that, 所述叶片从所述后缘部朝向所述前缘部从下方向上方倾斜，The blade is inclined from the bottom to the top from the trailing edge portion toward the leading edge portion, 所述前缘部位于比所述顶板部靠上侧的位置，The front edge portion is positioned above the top plate portion, 在所述前缘部与所述叶轮杯之间配置有壁部。A wall portion is arranged between the leading edge portion and the impeller cup. 2.根据权利要求1所述的轴流风扇，其特征在于，2. The axial flow fan according to claim 1, characterized in that, 所述壁部的朝向径向内侧的面呈沿周向弯曲的形状。The radially inner surface of the wall portion has a shape curved in the circumferential direction. 3.根据权利要求1或2所述的轴流风扇，其特征在于，3. The axial flow fan according to claim 1 or 2, characterized in that, 所述壁部的朝向径向外侧的面与所述叶轮杯的所述侧面部在轴向上共面地延伸。The radially outer surface of the wall portion extends coplanarly with the side surface portion of the impeller cup in the axial direction. 4.根据权利要求1至3中的任意一项所述的轴流风扇，其特征在于，4. The axial flow fan according to any one of claims 1 to 3, characterized in that, 所述叶片具有：The blade has: 薄壁部，其轴向长度短；The thin-walled part has a short axial length; 厚壁部，其在所述前缘部侧且轴向长度比所述薄壁部长；以及a thick-walled portion that is on the front edge portion side and has an axial length longer than the thin-walled portion; and 台阶部，其连接所述厚壁部和所述薄壁部。and a stepped portion connecting the thick-walled portion and the thin-walled portion. 5.根据权利要求4所述的轴流风扇，其特征在于，5. The axial flow fan according to claim 4, wherein, 所述厚壁部的轴向长度随着从所述壁部朝向所述叶片的外缘部而变短。The axial length of the thick wall portion becomes shorter from the wall portion toward the outer edge portion of the blade. 6.根据权利要求1至5中的任意一项所述的轴流风扇，其特征在于，6. The axial flow fan according to any one of claims 1 to 5, wherein, 该轴流风扇还具有壳体，该壳体配置在比所述叶轮靠径向外侧的位置，The axial flow fan further includes a casing disposed radially outward of the impeller, 在所述叶片的外缘部的所述后缘部侧具有朝向轴向的下方向延伸的翼端部。The outer edge part of the said blade has the blade edge part extended toward the axial direction downward on the said trailing edge part side. 7.根据权利要求6所述的轴流风扇，其特征在于，7. The axial flow fan according to claim 6, wherein, 从侧面观察所述叶轮时，所述翼端部位于所述叶轮杯的轴向上端与轴向下端之间。When viewing the impeller from the side, the wing end is located between the axially upper end and the axially lower end of the impeller cup. 8.根据权利要求2或7所述的轴流风扇，其特征在于，8. The axial flow fan according to claim 2 or 7, characterized in that, 所述顶板部具有向轴向下侧凹陷的槽，The top plate portion has a groove recessed toward the axial lower side, 所述槽配置在比所述壁部的朝向径向内侧的面靠径向内侧的位置。The groove is arranged radially inward of the radially inward surface of the wall portion. 9.根据权利要求1至8中的任意一项所述的轴流风扇，其特征在于，9. The axial flow fan according to any one of claims 1 to 8, characterized in that, 该轴流风扇还具有壳体，该壳体配置在比所述叶轮靠径向外侧的位置，The axial flow fan further includes a casing disposed radially outward of the impeller, 所述壳体具有：The housing has: 马达基座部，其对所述马达进行支承；a motor base portion supporting the motor; 框架部，其位于比所述马达基座部靠径向外侧的位置；以及a frame portion located radially outward of the motor base portion; and 连接肋，其连接所述马达基座部和所述框架部，a connecting rib connecting the motor base portion and the frame portion, 所述框架部具有内壁部和外壁部，The frame portion has an inner wall portion and an outer wall portion, 该内壁部在上侧设置有进气口，在下侧设置有排气口，并且内侧供空气流动，The inner wall is provided with an air inlet on the upper side and an exhaust port on the lower side, and the inner wall is provided with air flow, 该轴流风扇设置有第1肋，该第1肋与所述内壁部和所述外壁部连接，并且从所述连接肋沿与所述连接肋相同的方向延伸。The axial flow fan is provided with a first rib which is connected to the inner wall portion and the outer wall portion and extends from the connecting rib in the same direction as the connecting rib. 10.根据权利要求9所述的轴流风扇，其特征在于，10. The axial flow fan according to claim 9, wherein, 所述外壁部包含互相呈直角连接的第1边和第2边，The outer wall portion includes a first side and a second side connected at right angles to each other, 从轴向观察时，从第1边垂直延伸的第2肋与所述连接肋连接。When viewed in the axial direction, a second rib extending perpendicularly from the first side is connected to the connecting rib. 11.根据权利要求10所述的轴流风扇，其特征在于，11. The axial flow fan according to claim 10, wherein, 从轴向观察时，从所述第2边垂直延伸的第3肋与所述内壁部连接。When viewed in the axial direction, a third rib extending perpendicularly from the second side is connected to the inner wall portion.
CN202110643118.6A 2020-06-12 2021-06-09 Axial flow fan Pending CN113803279A (en)

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Application publication date: 20211217