CN111441977A - Axial flow fan blade, fan assembly and air conditioner thereof - Google Patents

Axial flow fan blade, fan assembly and air conditioner thereof Download PDF

Info

Publication number
CN111441977A
CN111441977A CN202010337597.4A CN202010337597A CN111441977A CN 111441977 A CN111441977 A CN 111441977A CN 202010337597 A CN202010337597 A CN 202010337597A CN 111441977 A CN111441977 A CN 111441977A
Authority
CN
China
Prior art keywords
arc
blade
hub
wing structure
shaped section
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.)
Granted
Application number
CN202010337597.4A
Other languages
Chinese (zh)
Other versions
CN111441977B (en
Inventor
钱培
刘佳薇
蒋力
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.)
Aux Air Conditioning Co Ltd
Ningbo Aux Electric Co Ltd
Original Assignee
Aux Air Conditioning Co Ltd
Ningbo Aux Electric Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Aux Air Conditioning Co Ltd, Ningbo Aux Electric Co Ltd filed Critical Aux Air Conditioning Co Ltd
Priority to CN202010337597.4A priority Critical patent/CN111441977B/en
Publication of CN111441977A publication Critical patent/CN111441977A/en
Application granted granted Critical
Publication of CN111441977B publication Critical patent/CN111441977B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • 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
    • 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
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/52—Casings; Connections of working fluid for axial pumps
    • F04D29/54—Fluid-guiding means, e.g. diffusers
    • F04D29/541—Specially adapted for elastic fluid pumps
    • F04D29/545—Ducts
    • F04D29/547—Ducts having a special shape in order to influence fluid flow
    • 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

Landscapes

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

Abstract

The invention provides an axial flow fan blade, a fan assembly and an air conditioner thereof, wherein the axial flow fan blade comprises a hub, blades and a guide wing structure, and the blades are arranged around the hub; the two side surfaces of the blade are respectively a suction surface and a pressure surface, and the guide wing structure is convexly arranged at one end, far away from the hub, of the pressure surface. According to the axial flow fan blade, the guide wing structure is arranged on the pressure surface of the blade, so that airflow flowing from the pressure surface of the blade to the top of the blade is blocked, and the airflow flowing through the pressure surface of the blade is prevented from flowing back to the side of the suction surface of the blade from the top of the blade along the pressure surface, so that the leakage amount of the airflow at the top of the blade when the fan blows out is reduced, the air output loss of the fan is reduced, and the air output of the fan is increased.

Description

Axial flow fan blade, fan assembly and air conditioner thereof
Technical Field
The invention relates to the technical field of air conditioners, in particular to an axial flow fan blade, a fan assembly and an air conditioner with the axial flow fan blade.
Background
At present, an air conditioner outdoor unit fan system widely uses axial flow fan blades and a semi-open type guide ring surrounding the peripheries of the axial flow fan blades. Because the inner diameter of the flow guide ring is slightly larger than the maximum diameter of the axial-flow fan blade, a gap exists between the inner wall of the flow guide ring and the top of the axial-flow fan blade (namely the blade top), when a fan in an outdoor unit works, airflow in the outdoor unit easily flows back to the suction side of the blade from the pressure surface of the blade through the blade top when flowing from the front edge to the rear edge of the axial-flow fan blade, and therefore the airflow flowing into the space between the blade top and the inner wall of the flow guide ring is blocked from being blown out of the fan through the flow guide ring, the airflow leaks at the blade top.
Disclosure of Invention
The invention solves the problems that: how to reduce the leakage amount of the airflow at the blade top when the fan blows out.
In order to solve the problems, the invention provides an axial flow fan blade which comprises a hub, blades and a guide wing structure, wherein the blades are arranged around the hub; the two side surfaces of the blade are respectively a suction surface and a pressure surface, and the guide wing structure is convexly arranged at one end, far away from the hub, of the pressure surface.
Therefore, the axial flow fan blade and the flow guide ring are coaxially arranged, and the guide wing structure is strip-shaped and convexly arranged at one end of the pressure surface, which is far away from the hub; when the axial flow fan blade rotates, when airflow flows from the pressure surface of the blade to the edge of the end, far away from the hub, of the pressure surface, the guide wing structure can restrain the speed component, radially outward along the hub, of the airflow flowing from the pressure surface of the blade to the blade top, namely the airflow is prevented from flowing radially outward along the hub, the airflow flowing through the pressure surface of the blade can be prevented from flowing back to the side, where the suction surface of the blade is located, of the blade from the blade top along the pressure surface, and accordingly leakage of the airflow at the blade top when the fan blows out air is reduced, loss of air output of the fan is reduced, and air output of the fan is increased; moreover, the guide wing structure is arranged, so that the strength of a blade tip leakage vortex generated by airflow leakage at the blade tip is weakened, and the vortex noise of the blade tip is reduced.
Optionally, the blade has an outer edge, which is an edge portion of an end of the blade remote from the hub; the guide wing structure is connected with the outer edge.
Therefore, the distance between one end of the guide wing structure in the rotation direction of the hub and the outer edge is 0, so that when the distance between one end of the guide wing structure in the rotation direction of the hub and the outer edge is larger than 0, the air flow is easy to separate at one end of the guide wing structure in the rotation direction of the hub and flows to the blade top of the blade along the pressure surface of the blade from the position between the guide wing structure and the outer edge.
Optionally, the outer rim comprises a first arc segment and a second arc segment, the direction from the first arc segment to the second arc segment being opposite to the direction of rotation of the hub; and the curvature of the first arc-shaped section is smaller than that of the second arc-shaped section, and the guide wing structure is positioned at the joint of the first arc-shaped section and the second arc-shaped section.
Therefore, the outer edge of the blade comprises a first arc-shaped section and a second arc-shaped section, and the first arc-shaped section is in smooth transition connection with the second arc-shaped section; the second arc-shaped section with smaller curvature radius is arranged in the flow guide ring, and the distance between the second arc-shaped section and the inner wall of the flow guide ring is gradually increased in the direction from the suction surface to the pressure surface of the blade, so that an air outlet channel of the fan has larger volume, and the air outlet quantity of the fan is increased; the guide vane structure is preferably provided at the junction of the first arcuate segment and the second arcuate segment to impede airflow tending to flow from the junction of the first arcuate segment and the second arcuate segment back to the suction surface side.
Optionally, the perpendicular distance from the first arc-shaped segment to the hub axis is a fixed value, and the perpendicular distance from the second arc-shaped segment to the hub axis gradually decreases from the junction of the second arc-shaped segment and the first arc-shaped segment to the junction of the second arc-shaped segment away from the junction.
Therefore, when the first arc-shaped section is arranged outside the area enclosed by the flow guide ring, the blades have larger contact area with the airflow in the outdoor unit, so that the blades can drive more airflow to be blown out of the outdoor unit through the flow guide ring; and, the second segmental arc that curvature radius is less than first segmental arc sets up in the water conservancy diversion circle, and in the direction from the suction surface of blade to the pressure surface, the distance of second segmental arc and water conservancy diversion circle inner wall increases gradually for the air-out passageway of fan has bigger volume, thereby improves the air output of fan.
Optionally, the direction of extension of the guide vane structure is opposite to the direction of rotation of the hub; the guide wing structure is provided with a large end and a small end, and the extending direction of the guide wing structure is the direction from the large end to the small end.
Therefore, the extending direction of the guide wing structure is opposite to the rotating direction of the hub, when the axial flow fan blade rotates, when the guide wing structure is impacted by foreign matters, the large end, which is positioned at one end of the guide wing structure, which is the same as the rotating direction of the hub, is firstly contacted with the foreign matters, and as the guide wing structure has a certain width at the large end, the guide wing structure can bear larger impact resistance and can ensure the stable operation of the axial flow fan blade.
Optionally, the orthographic projection of the guide wing structure on the blade is wing-shaped; and the distance from the large end to the outer edge is smaller than the distance from the small end to the outer edge.
Therefore, in the extending direction of the guide wing structure, the distance from the guide wing structure to the outer edge of the blade where the guide wing structure is located is gradually increased, so that the speed and the air volume flowing towards the hub direction can be obtained when the airflow flows along the side face of the guide wing structure towards one side of the hub, the airflow is prevented from flowing to the blade top after leaving the guide wing structure, the airflow finally leaves the pressure surface and then flows out of the outdoor unit towards the direction away from the pressure surface, and the flow guiding effect of the guide wing structure is guaranteed.
Optionally, an included angle between a line connecting the large end and the small end and a tangent line at a connection point of the first arc-shaped segment and the second arc-shaped segment is less than or equal to 30 °.
Therefore, the value range of the included angle between the connecting line between the large end and the small end and the tangent line at the connecting part of the first arc-shaped section and the second arc-shaped section is 0-30 degrees, so that the airflow of the pressure surface is blocked from flowing to the suction surface side, the separation of the airflow at the large end of the guide wing structure is prevented, and the blocking effect of the guide wing structure on the airflow is guaranteed.
Optionally, a ratio of a distance from the large end to the small end of the guide wing structure to the outer edge arc length of the blade where the guide wing structure is located is between 0.02 and 0.2.
Therefore, the ratio of the distance from the large end to the small end to the arc length of the outer edge is between 0.02 and 0.2, so that the guide wing structure is ensured to have the effect of blocking airflow from flowing to the suction surface from the joint of the first arc-shaped section and the second arc-shaped section, and meanwhile, the guide wing structure cannot cause great obstruction to the rotation of the axial flow fan blade.
Optionally, the ratio of the protrusion height of the guide vane structure to the thickness of the blade at the junction of the first and second arc segments is between 0.5 and 2; wherein the thickness of the blade is the vertical distance between the suction surface and the pressure surface.
Therefore, the ratio of the height of the protrusion of the guide wing structure on the pressure surface to the thickness of the blade at the joint of the first arc-shaped section and the second arc-shaped section is between 0.5 and 2, so that the guide wing structure has the function of blocking airflow from flowing to the suction surface from the joint of the first arc-shaped section and the second arc-shaped section, and meanwhile, the guide wing structure cannot cause great obstruction to the rotation of the axial flow fan blade; and because the guide wing structure has certain protruding height, the rigidity of the blade at the joint of the first arc-shaped section and the second arc-shaped section is increased, so that the blade is prevented from deforming.
Optionally, the blade further has a trailing edge, the trailing edge is an edge portion of the blade opposite to the rotation direction of the hub, one end of the trailing edge is connected to the hub, and the other end of the trailing edge is connected to the second arc-shaped segment; the guide wing structure is provided with a plurality of guide wing structures, the plurality of guide wing structures are all located the junction of the first arc-shaped section and the second arc-shaped section with the trailing edge with between the junction of the outer edge, and a plurality of the guide wing structures are distributed along the rotation direction of the hub at intervals.
From this, set up a plurality of interval distribution's guide wing structure on the blade to block that the air current flows to the suction surface from the second segmental arc on the pressure surface, reduce the leakage quantity of air current at second segmental arc department, reduce the air output loss of fan.
Optionally, an included angle of a vertical line between the large end or the small end of each two adjacent guide wing structures and the axis of the hub is greater than or equal to 10 ° and less than or equal to 30 °.
Therefore, in two adjacent guide wing structures, the value range of an included angle t between a vertical connecting line between the large end (small end) of one guide wing structure and the axis of the hub and a vertical connecting line between the large end (small end) of the other guide wing structure and the axis of the hub is 10-30 degrees; the guide wing structure can not cause great obstruction to the rotation of the axial flow fan blade while playing a role of blocking the airflow from flowing from the second arc-shaped section to the side where the suction surface is located.
Optionally, the blade further has a leading edge, the leading edge is an edge portion of the blade in the same rotation direction as the hub, one end of the leading edge is connected to the hub, and the other end of the leading edge is connected to the first arc-shaped segment; and the linear form of the front edge is the steepest descent linear form.
Therefore, the front edge line type of the axial flow fan blade is in a most speed reduction line (namely, cycloid, also called as spinning wheel line) type, so that the flow resistance of the airflow on the front edge is the minimum, the centrifugal force generated when the airflow rotates along with the blade can be well balanced, the airflow is restrained from flowing outwards along the radial direction of the hub, the blade top leakage loss of the airflow is reduced, the air output of the fan is improved, and the heat exchange effect of the fan is further improved.
Optionally, an XY coordinate system is established on a plane perpendicular to the axis of the hub, where a straight line on which a connecting line between the two ends of the leading edge is located is an X axis, and a straight line perpendicular to the X axis and passing through one end of the leading edge connected to the hub is a Y axis, and the linear equation of the leading edge is:
Figure BDA0002467187100000041
wherein k is a coefficient, L is a distance between two ends of the leading edge on the X-axis, θ is an angle between a connecting line between a point on the leading edge and an origin of the XY coordinate system and the X-axis, X is a vertical distance from the point on the leading edge to the Y-axis, and Y is a vertical distance from the point on the leading edge to the X-axis.
Therefore, the front edge is of the steepest descent type, so that the time of the airflow from the blade tip to the blade root along the front edge is the shortest, the resistance received by the airflow during flowing is the smallest, the centrifugal force generated when the airflow rotates along with the blade can be better balanced, the airflow is inhibited from flowing outwards along the radial direction of the hub, the leakage loss of the blade top of the airflow is reduced, the air output of the fan is improved, and the heat exchange effect of the fan is further improved.
Optionally, an orthographic projection of a connection of the leading edge and the first arc-shaped segment on a plane perpendicular to the hub axis is arc-shaped or elliptical arc-shaped.
Therefore, the connecting part of the first arc-shaped section of the outer edge of the blade and the front edge of the blade is rounded, so that the connecting part of the first arc-shaped section and the front edge is arc-shaped or elliptic arc-shaped, the safety of the blade is improved, and the blade is prevented from scratching a human body; and the arc or the elliptic arc is in smooth transition with the front edge and the first arc section so as to ensure the high-order curvature continuity of the curve of the blade at the blade tip and inhibit the separation of airflow at the blade tip, thereby improving the pneumatic performance of the axial flow fan blade.
In order to solve the above problems, the present invention further provides a fan assembly, which comprises a flow guiding ring and the above axial flow fan blade, wherein the axial flow fan blade is coaxially arranged with the flow guiding ring; the guide ring comprises a first air guide part, a second air guide part and a third air guide part which are sequentially connected, air flow flowing into the guide ring flows in from the first air guide part and flows out from the third air guide part, and the inner diameter of the end part of the first air guide part far away from the second air guide part and the inner diameter of the end part of the third air guide part far away from the second air guide part are both larger than the inner diameter of the second air guide part.
The advantages of the fan assembly and the axial flow fan blade relative to the prior art are the same, and are not described again.
Optionally, the blade has an outer edge, the outer edge includes a first arc-shaped section and a second arc-shaped section, and a connection point of the first arc-shaped section and the second arc-shaped section is located in an area surrounded by the first air guiding portion.
Therefore, the joint of the first arc-shaped section and the second arc-shaped section is positioned in the area enclosed by the first air guide part, so that most of the first arc-shaped section is positioned outside the area enclosed by the first air guide part, the blades have larger contact area with the air flow in the outdoor unit, and more air flow can be blown out of the outdoor unit through the flow guide ring; meanwhile, the first air guide part is used as an inlet guide arc to guide the air flow to flow into the guide ring, and the air flow has a velocity component pointing to the axis direction of the hub (namely, radially inwards along the hub) when flowing in the inlet guide arc, so that the air flow can inhibit the flow of the air flow flowing from the pressure surface of the blade to the blade top, the vortex and the blade top leakage of the air flow at the joint of the first arc-shaped section and the second arc-shaped section are prevented, and the leakage amount of the air flow at the blade top when the fan blows out air is further reduced.
Optionally, the first air guiding portion is in a bell mouth shape, an orthographic projection of the first air guiding portion on a plane parallel to the axis of the hub is provided with two arcs, and the two arcs are respectively located at two ends of the orthographic projection of the first air guiding portion in the direction perpendicular to the axis of the hub; the ratio of the vertical distance from the joint of the first arc-shaped section and the second arc-shaped section to the end face of the first air guiding part far away from the second air guiding part to the radius of the arc is between 0.1 and 0.9.
From this, first wind-guiding portion is the horn mouth form, the junction of first segmental arc and second segmental arc is located the region that first wind-guiding portion encloses, make when the air current pastes the inner wall that leans on first wind-guiding portion and gets into the water conservancy diversion circle, the air current has a radial velocity that flows towards wheel hub position department, the guide wing structure can further guide this air current to flow on the pressure surface of blade, with the rotatory centrifugal force of balanced air current, further block the air current that is located on the pressure surface and flow to suction surface place side from the outer fringe, the leakage quantity of air current when the fan goes out the wind in blade top department is reduced, thereby reduce the air output loss of fan, reduce the vortex noise of blade top, improve the wind-guiding efficiency of axial compressor fan blade.
In order to solve the above problems, the present invention further provides an air conditioner, including the axial flow fan blade described above, and/or the fan assembly described above.
Compared with the prior art, the air conditioner has the same advantages as the axial flow fan blade or the fan assembly, and the description is omitted.
Drawings
FIG. 1 is a schematic structural diagram of an axial-flow fan blade according to an embodiment of the present invention;
FIG. 2 is an enlarged view of a portion A of FIG. 1;
FIG. 3 is an enlarged view of a portion B of FIG. 1;
FIG. 4 is a schematic structural diagram of an axial-flow fan blade according to another view angle in the embodiment of the present disclosure;
FIG. 5 is an enlarged view of a portion of FIG. 4 at C;
FIG. 6 is a schematic structural diagram of a fan assembly according to an embodiment of the present invention;
FIG. 7 is a schematic structural view of another perspective of a fan assembly according to an embodiment of the present invention;
FIG. 8 is an enlarged view of a portion of FIG. 7 at D;
FIG. 9 is a schematic view of a blade and hub configuration according to an embodiment of the present invention;
FIG. 10 is a schematic structural diagram of a blade and guide vane structure according to an embodiment of the present invention.
Description of reference numerals:
1-axial flow fan blade; 11-a blade; 111-the trailing edge; 112-leading edge; 113-outer edge; 1131 — a first arc segment; 1132 — a second arc segment; 12-a hub; 13-a guide wing structure; 131-big end; 132-small end; 2-a flow guide ring; 21-a first air guiding part; 22-a second wind-guiding portion; 23-third wind-guiding portion.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "upper", "lower", "left", "right", "high", "low", and the like are based on the orientations or positional relationships shown in the drawings, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, cannot be construed as limiting the present invention.
Referring to fig. 1 and 4, the present invention provides an axial flow fan blade 1, including a hub 12, a blade 11 and a guide wing structure 13, where the blade 11 is disposed around the hub 12 and located in a radial direction of the hub 12; two side surfaces of the blade 11 are respectively a suction surface and a pressure surface, and the guide wing structure 13 is convexly arranged at one end of the pressure surface far away from the hub 12.
The axial flow fan blade 1 comprises a hub 12 and at least two blades 11 arranged around the hub 12, wherein the blades 11 and the hub 12 can be integrally formed (such as integral casting) or welded, riveted or connected by using a fastener; the hub 12 is columnar, one end of the blade 11 is connected with the hub 12, and the other end extends in the direction far away from the hub 12 along the radial direction of the hub 12; the blades 11 are flat or arc-shaped to guide wind. Two side surfaces of the blade 11 are a suction surface and a pressure surface respectively, the suction surface of the blade 11 faces the inside of the outdoor unit, the pressure surface of the blade 11 faces the outside of the outdoor unit, when the axial flow fan blade 1 rotates, the blade 11 drives an air flow on the side where the suction surface is located to flow through the pressure surface and flow in a direction away from the pressure surface, and the heat absorbed by the fan from the condenser is blown out of the outdoor unit along with the air flow, which is worth explaining that the rotation of the axial flow fan blade 1 in this embodiment refers to the rotation of the axial flow fan blade 1 when the axial flow fan blade 1 operates, and ω in fig. 1 is the rotation direction of the hub 12 and is also the rotation direction (or rotation.
The axial flow fan blade 1 and the flow guide ring 2 are coaxially arranged, and because a gap exists between the blade top of the blade 11 (namely, one end of the blade 11 far away from the hub 12) and the inner wall of the flow guide ring 2, when the axial flow fan blade 1 rotates, airflow easily flows back to the side of the suction surface from the edge of one end, far away from the hub 12, of the pressure surface of the blade 11, and the airflow on the side of the suction surface is blocked to flow to the side of the pressure surface through the blade top, so that the airflow leaks at the blade top, and the air output of the fan is reduced; moreover, the airflow is easy to generate vortex at the blade tip, namely, the blade tip leakage vortex is formed, and great noise is generated. This embodiment can solve the problem by providing the guide wing structure 13 at the end of the pressure surface of the blade 11 far from the hub 12, specifically, the guide wing structure 13 is strip-shaped and is convexly provided at the edge of the end of the pressure surface far from the hub 12; the leading wing structure 13 may be connected to the edge of the pressure surface of the blade 11 away from the hub 12, or the leading wing structure 13 may be arranged near the edge of the pressure surface of the blade 11 away from the hub 12, i.e. the leading wing structure 13 is not connected to the edge of the pressure surface away from the hub 12, but has a certain distance. When the axial flow fan blade 1 rotates, the airflow flowing on the pressure surface of the blade 11 has a velocity component radially outward along the hub 12 (i.e. toward the direction away from the hub 12), so that the airflow easily flows in the direction away from the hub 12, when the airflow flows to the edge of the end of the pressure surface away from the hub 12, the guide wing structure 13 can block the airflow from flowing radially outward along the hub 12, so as to prevent the airflow from flowing back to the suction surface side of the blade 11 from the blade top, and make the airflow blocked by the guide wing structure 13 flow along the side surface of the guide wing structure 13 toward the hub 12 (the guide wing structure 13 has a flow guiding effect on the airflow), so that the airflow continues to flow along the pressure surface, and finally flows out of the outdoor unit; in addition, the leakage amount of the airflow at the blade top is reduced, so that the strength of a blade top leakage vortex formed at the blade top is weakened, and the noise of the blade top leakage vortex is reduced; and the airflow at the side of the suction surface is not easily hindered by the backflow airflow at the blade top when flowing to the side of the pressure surface through the blade top, and after the airflow at the side of the suction surface flows to the side of the pressure surface through the blade top, the airflow can flow to the pressure surface along the side surface of the guide wing structure 13 facing the hub 12 side under the guiding action of the guide wing structure 13, and flows along the pressure surface, and finally flows out of the outdoor unit.
The edge of one end, far away from the hub 12, of the pressure surface of the blade 11 is provided with the guide wing structure 13, so that the speed component of the airflow flowing from the pressure surface of the blade 11 to the blade top, which is radially outward along the hub 12, is inhibited, namely, the airflow is prevented from flowing along the hub 12 radially outward, the airflow flowing through the pressure surface of the blade 11 can be prevented from flowing back to the side of the suction surface of the blade 11 from the blade top along the pressure surface, and accordingly, the leakage of the airflow at the blade top when the fan blows out air is reduced, the air output loss of the fan is reduced, and the air output of the fan is increased; moreover, the guide vane structure 13 is provided to weaken the strength of tip leakage vortex generated by the leakage of the airflow at the tip, thereby reducing the vortex noise of the tip.
Alternatively, as shown in fig. 2 and 6, the blade 11 has an outer edge 113, and the outer edge 113 is an edge portion of the end of the blade 11 away from the hub 12; the wing structure 13 is connected to the outer rim 113.
The blade 11 has a leading edge 112 (described in detail later), an outer edge 113, and a trailing edge 111 (described in detail later) connected in sequence, and a direction from the trailing edge 111 to the leading edge 112 of the blade 11 is the same as a rotation direction of the hub 12, that is, the leading edge 112 is an edge portion of the blade 11 in the same rotation direction as the hub 12, and the trailing edge 111 is an edge portion of the blade 11 in the opposite rotation direction to the hub 12. The guide wing structure 13 is preferably connected to the outer edge 113 of the blade 11, such that the distance between the end of the guide wing structure 13 in the rotation direction of the hub 12 and the outer edge 113 is 0, to avoid the situation that when the distance between the end of the guide wing structure 13 in the rotation direction of the hub 12 and the outer edge 113 is greater than 0, the airflow is easily separated at the end of the guide wing structure 13 in the rotation direction of the hub 12 and flows from between the guide wing structure 13 and the outer edge 113 to the blade tip of the blade 11 along the pressure surface of the blade 11.
Optionally, the outer rim 113 includes a first arcuate segment 1131 and a second arcuate segment 1132, the direction from the first arcuate segment 1131 to the second arcuate segment 1132 being opposite the direction of rotation of the hub 12; and the curvature of the first arcuate segment 1131 is less than the curvature of the second arcuate segment 1132, the guide wing structure 13 is located at the junction of the first arcuate segment 1131 and the second arcuate segment 1132.
The outer edge 113 of the blade 11 includes a first arc-shaped section 1131 and a second arc-shaped section 1132, the first arc-shaped section 1131 is in smooth transition connection with the second arc-shaped section 1132, and the curvature of the first arc-shaped section 1131 is smaller than that of the second arc-shaped section 1132, that is, the curvature radius of the first arc-shaped section 1131 is larger than that of the second arc-shaped section 1132, wherein the curvature radius is the inverse of the curvature, and the smaller the curvature radius is, the more the corresponding arc is bent; so, the bigger second segmental arc 1132 of crooked degree sets up in water conservancy diversion circle 2, in the direction from the suction surface of blade 11 to the pressure surface, the distance crescent of 2 inner walls of second segmental arc 1132 and water conservancy diversion circle for the air-out passageway of fan has bigger volume, thereby improves the air output of fan. The radius of curvature of the outer edge 113 of the blade 11 is changed (decreased) at the junction of the first and second arc-shaped sections 1131 and 1132 in the direction opposite to the rotation direction of the hub 12, so that the airflow passing through the pressure surface of the blade 11 easily flows back to the side of the suction surface from the junction of the first and second arc-shaped sections 1131 and 1132, therefore, the guide wing structure 13 is preferably provided at the junction of the first and second arc-shaped sections 1131 and 1132 to block the airflow passing through the pressure surface of the blade 11 from flowing back to the side of the suction surface from the junction of the first and second arc-shaped sections 1131 and 1132, so that the leakage amount of the airflow passing through the pressure surface of the blade 11 at the tip of the blade 11 is reduced.
Optionally, the perpendicular distance from the first arc segment 1131 to the axis of the hub 12 is a constant value, and the perpendicular distance from the second arc segment 1132 to the axis of the hub 12 decreases from the connection of the second arc segment 1132 with the first arc segment 1131 to the connection of the second arc segment 1132 away from the hub.
The direction from the end of the second arc-shaped segment 1132 connected to the first arc-shaped segment 1131 to the other end of the second arc-shaped segment 1132 is opposite to the rotation direction of the hub 12, and based on the fact that the curvature of the first arc-shaped segment 1131 is smaller than that of the second arc-shaped segment 1132, in the embodiment, the perpendicular distance from the outer edge 113 of the blade 11 to the axis of the hub 12 in the direction opposite to the rotation direction of the hub 12 gradually decreases from the connection point of the first arc-shaped segment 1131 and the second arc-shaped segment 1132; specifically, for the orthographic projection of the axial flow fan blade 1 on the plane perpendicular to the axis of the hub 12, the first arc-shaped section 1131 is an arc in the orthographic projection, the diameter of the circle where the arc is located is d1, and the center of the circle where the arc is located is on the axis of the hub 12; the perpendicular distance d1/2 from the first arcuate segment 1131 to the axis of the hub 12 in the direction opposite the direction of rotation of the hub 12 is a fixed value; and the second arc-shaped section 1132 is a smooth curve section in the orthographic projection, and the distance between the curve section and the axis of the hub 12 gradually decreases from the end of the second arc-shaped section 1132 connected with the first arc-shaped section 1131 to the end of the second arc-shaped section 1132 far away from the first arc-shaped section 1131. The perpendicular distance from the end of the second arc-shaped segment 1132 connected with the first arc-shaped segment 1131 to the axis of the hub 12 is d1/2, the diameter of the circle on which the end of the second arc-shaped segment 1132 far from the first arc-shaped segment 1131 is located is d2, then the perpendicular distance from the end of the second arc-shaped segment 1132 far from the first arc-shaped segment 1131 to the axis of the hub 12 is d2/2, and d1 > d 2.
With such an arrangement, in the vertical distances from the positions on the outer edge 113 of the blade 11 to the axis of the hub 12, the vertical distance from the first arc-shaped section 1131 to the axis of the hub 12 is the largest, so that when the first arc-shaped section 1131 is arranged outside the area enclosed by the flow guide ring 2, the blade 1 has a larger contact area with the airflow inside the outdoor unit, and the blade 1 can drive more airflow to blow out of the outdoor unit through the flow guide ring 2; moreover, the second arc-shaped section 1132 that the bending degree is greater than first arc-shaped section 1131 sets up in water conservancy diversion circle 2, and in the direction from the suction surface of blade 11 to the pressure surface, the distance crescent of 2 inner walls of second arc-shaped section 1132 and water conservancy diversion circle for the air-out passageway of fan has bigger volume, thereby improves the air output of fan.
Alternatively, as shown in connection with fig. 2, the direction of extension of the guide vane structure 13 is opposite to the direction of rotation of the hub 12; the guide wing structure 13 has a large end 131 and a small end 132, and the extending direction of the guide wing structure 13 is the direction from the large end 131 to the small end 132.
The width of the guide wing structure 13 at the large end 131 is greater than the width of the guide wing structure 13 at the small end 132, wherein the width of the guide wing structure 13 refers to the dimension of the guide wing structure 13 in the radial direction of the hub 12; the direction from the large end 131 to the small end 132 of the guide wing structure 13 is opposite to the rotation direction of the hub 12, so that when the axial flow fan blade 1 rotates, when the guide wing structure 13 is impacted by foreign matters (such as gravel and bugs), the large end 131 at the end of the guide wing structure 13, which is the same as the rotation direction of the hub 12, is firstly contacted with the foreign matters, and as the guide wing structure 13 has a certain width at the large end 131, the guide wing structure can bear a large impact resistance, and can ensure the stable operation of the axial flow fan blade 1.
Optionally, the orthographic projection of the guide wing structure 13 on the blade 11 on which it is located is in the shape of a wing; and the distance from large end 131 to outer edge 113 is less than the distance from small end 132 to outer edge 113.
In the extending direction of the guide wing structure 13, the distance from the guide wing structure 13 to the outer edge 113 of the blade 11 where the guide wing structure 13 is located gradually increases, and accordingly, the vertical distance from the guide wing structure 13 to the axis of the hub 12 gradually decreases, so that when the airflow flows along the side surface of the guide wing structure 13 facing the hub 12 side, the airflow can obtain the speed and the airflow flowing towards the hub 12 direction, and the airflow is prevented from flowing to the blade top after leaving the guide wing structure 13, so that the airflow finally leaves the pressure surface and then flows out of the outdoor unit towards the direction away from the pressure surface, and the flow guiding effect of the guide wing structure 13 is ensured.
Alternatively, as shown in connection with fig. 2, the line between the large end 131 and the small end 132 makes an angle less than or equal to 30 ° with a tangent line at the junction of the first arcuate segment 1131 and the second arcuate segment 1132.
The forward projection of the wing structure 13 on the blade 11 is in the form of an airfoil, in which the large end 131 of the wing structure 13 is an arc segment in the forward projection, and the small end 132 of the wing structure 13 is a sharp point in the forward projection, since the direction from the large end 131 to the small end 132 is opposite to the direction of rotation of the hub 12, the large end 131 of the wing structure 13 is also the front end of the wing structure 13, and the small end 132 of the wing structure 13 is also the rear end of the wing structure 13, the sharp point can be referred to as the rear end point of the forward projection of the wing structure 13, the point on the arc segment having the greatest distance from the rear end point is referred to as the front end point of the forward projection, and the line between the large end 131 and the small end 132 is referred to as the line between the front end point and the rear end point, the line between the large end 131 and the small end 132 and the tangent to the first arc segment 1131 is in the range of 0-30 DEG, if the line between the large end 131 and the small end 132 and the tangent to the first arc segment 1132 is greater than the angle of the tangent to the radial direction 6332 of the tip 13, so that the flow of the blade structure is reduced (the flow of the air flow structure) on the blade structure on the side of the blade 13 is prevented from separating from the tip 13 and the tip 13 from the tip 13, thereby preventing the tip 13 from the flow of the flow structure from the tip 13 (the radial flow structure from the tip 13, the tip 13 from being caused by the radial flow of the tip 13, which is reduced).
Optionally, as shown in fig. 1 and fig. 2, the ratio of the distance from the large end 131 to the small end 132 of the guide wing structure 13 to the arc length of the outer edge 113 of the blade 11 where the guide wing structure 13 is located is between 0.02 and 0.2.
According to the foregoing, the connection line between the large end 131 and the small end 132 of the guide wing structure 13 is the connection line between the front end point and the rear end point of the orthographic projection of the guide wing structure 13 on the blade 11, the distance from the large end 131 to the small end 132 refers to the length b of the connection line between the front end point and the rear end point, the arc length of the outer edge 113 is the sum S of the arc lengths of the first arc-shaped section 1131 and the second arc-shaped section 1132, and the ratio of b to S is between 0.02 and 0.2. If the ratio of b to S is less than 0.02, the effect of the guide wing structure 13 for blocking airflow from flowing back to the side where the suction surface is located is poor; the guide wing structure 13 has a certain weight, so that the weight of the blade 11 at the blade top is increased, and if the ratio of b to S is greater than 0.2, the volume and the weight of the guide wing structure 13 are increased, so that the resistance brought by the guide wing structure 13 is increased when the axial flow fan blade 1 rotates; therefore, the ratio of b to S is between 0.02 and 0.2, so as to ensure that the guide vane structure 13 has the function of blocking the airflow from flowing from the connection of the first arc-shaped section 1131 and the second arc-shaped section 1132 to the suction surface, and meanwhile, cannot cause a large obstruction to the rotation of the axial flow fan blade 1.
Optionally, as shown in fig. 4 and 5, the ratio of the protrusion height of the guide wing structure 13 to the thickness of the blade 11 at the connection of the first arc-shaped section 1131 and the second arc-shaped section 1132 is between 0.5 and 2; wherein the thickness of the blade 11 is the vertical distance between the suction surface and the pressure surface.
The height of the protrusion of the guide wing structure 13 on the pressure surface of the blade 11 is recorded as h1, the thickness of the blade 11 at the connection between the first arc-shaped section 1131 and the second arc-shaped section 1132 is recorded as h2, and the ratio of h1 to h2 is between 0.5 and 2, wherein the height of the protrusion of the guide wing structure 13 refers to the vertical distance from the side of the guide wing structure 13 away from the pressure surface to the connection between the guide wing structure 13 and the pressure surface; if the ratio of h1 to h2 is less than 0.5, the height h1 of the guide wing structure 13 on the pressure surface is too small to effectively prevent the airflow from flowing back to the suction surface of the blade 11; because the guide wing structure 13 has a certain weight, the weight of the blade 11 at the blade top is increased, and if the ratio of h1 to h2 is greater than 2, the protrusion height h1 of the guide wing structure 13 on the pressure surface is too large, the volume and the weight of the guide wing structure 13 are increased, and the resistance brought by the guide wing structure 13 is increased when the axial flow fan blade 1 rotates; therefore, the ratio of h1 to h2 is between 0.5 and 2, so as to ensure that the guide vane structure 13 has the function of blocking the airflow from flowing from the joint of the first arc-shaped section 1131 and the second arc-shaped section 1132 to the suction surface, and does not cause a large obstruction to the rotation of the axial flow fan blade 1; and because the guide wing structure 13 has a certain protrusion height, the rigidity of the blade 11 at the connection of the first arc-shaped section 1131 and the second arc-shaped section 1132 is increased to prevent the blade 11 from being deformed.
Optionally, as shown in fig. 6, 9, and 10, the blade 11 further has a trailing edge 111, where the trailing edge 111 is an edge portion of the blade 11 opposite to the rotation direction of the hub 12, and one end of the trailing edge 111 is connected to the hub 12, and the other end is connected to the second arc-shaped segment 1132; the plurality of guide wing structures 13 are provided, the plurality of guide wing structures 13 are located between the connection of the first arc-shaped section 1131 and the second arc-shaped section 1132 and the connection of the trailing edge 111 and the outer edge 113, and the plurality of guide wing structures 13 are distributed at intervals along the rotation direction of the hub 12.
In this embodiment, a plurality of guide wing structures 13 are provided, and since the radius of curvature of the outer edge 113 of the blade 11 is changed (reduced) at the connection between the first arc-shaped section 1131 and the second arc-shaped section 1132, tip leakage of the airflow is likely to occur between the connection between the first arc-shaped section 1131 and the second arc-shaped section 1132 and the connection between the trailing edge 111 and the outer edge 113, and therefore, the plurality of guide wing structures 13 are all disposed between the connection between the first arc-shaped section 1131 and the second arc-shaped section 1132 and the connection between the trailing edge 111 and the outer edge 113, so that when the axial flow fan blade 1 rotates, the guide wing structures 13 can prevent the airflow flowing along the pressure surface of the blade 11 to the end of the blade 11 away from the hub 12 from flowing back to the side of the suction surface through the tip. The plurality of guide wing structures 13 are distributed at intervals along the rotation direction of the hub 12, that is, a space exists between two adjacent guide wing structures 13; the problem that when two adjacent guide wing structures 13 are connected together, mutual interference is easy to occur, and a flow channel is blocked is avoided, so that air resistance is large when the axial flow fan blade 1 rotates.
Further, the guide wing structures 13 are equally spaced between the junction of the first and second arc segments 1131 and 1132 and the junction of the trailing edge 111 and the outer edge 113; if the distance between two adjacent guide wing structures 13 in the plurality of guide wing structures 13 is inconsistent, the stability of the blade 11 during rotation is not facilitated; therefore, the plurality of guide wing structures 13 are preferably distributed at equal intervals, and the large ends 131 of the plurality of guide wing structures 13 are all arranged at the second arc-shaped section 1132 of the outer edge 113, so as to better prevent the airflow flowing on the pressure surface of the blade 11 from flowing back to the side of the suction surface from the second arc-shaped section 1132, further reduce the leakage amount of the airflow at the second arc-shaped section 1132, reduce the loss of the air output of the fan, and increase the air output of the fan; moreover, the strength of the generated tip leakage vortex is further weakened, and the vortex noise of the tip leakage vortex is reduced.
Alternatively, as shown in fig. 9 and 10, the included angle between the large end 131 or the small end 132 of two adjacent guide wing structures 13 and the vertical line between the axes of the hubs 12 is greater than or equal to 10 ° and less than or equal to 30 °.
On the basis that the guide wing structures 13 are provided with a plurality of guide wing structures 13, in two adjacent guide wing structures 13, the included angle t between the vertical connecting line between the large end 131 (small end 132) of one guide wing structure 13 and the axis of the hub 12 and the vertical connecting line between the large end 131 (small end 132) of the other guide wing structure 13 and the axis of the hub 12 is within the range of 10-30 degrees; if the included angle t is too small (less than 10 degrees), the distance between the adjacent guide wing structures 13 is too small, mutual interference is easy to occur, the flow channel is blocked, and the air resistance is larger when the axial flow fan blade 1 rotates; if the included angle t is too large (greater than 30 °), the distance between adjacent guide wing structures 13 is too large, and due to the size limitation of the blade 11, a part of the guide wing structures 13 easily exceeds the pressure surface of the blade 11, so that the guide wing structures 13 are influenced to guide the flow of the airflow on the pressure surface. Therefore, the angle t is preferably between 10 ° and 30 °.
Optionally, as shown in fig. 6 and 9, the blade 11 further has a leading edge 112, where the leading edge 112 is an edge portion of the blade 11 that rotates in the same direction as the hub 12, and one end of the leading edge 112 is connected to the hub 12, and the other end is connected to the first arc-shaped segment 1131; and the leading edge 112 has a steepest descent line type.
When the axial flow fan blade 1 rotates, the upper front edge 112 of the blade 11 is firstly contacted with the airflow formed when the fan rotates, the airflow flows from the pressure surface to the rear edge 111 through the front edge 112, and leaves the pressure surface towards the direction far away from the pressure surface to flow out of the fan; the linear shape of the front edge 112 is a most deceleration line (i.e., a cycloid line, also called a trochoid line), so that the time for the airflow to flow from the blade tip (i.e., the end where the front edge 112 is connected to the first arc-shaped section 1131) to the blade root (i.e., the end where the front edge 112 is connected to the hub 12) along the front edge 112 is the shortest, and the resistance applied to the airflow during flowing is the smallest, which can better balance the centrifugal force generated when the airflow rotates along with the blade 11, suppress the airflow from flowing radially outward along the hub 12, reduce the tip leakage loss of the airflow, increase the air output of the fan, and further increase the heat exchange effect of the fan.
Alternatively, as shown in fig. 9, an XY coordinate system is established on a plane perpendicular to the axis of the hub 12, a straight line connecting the two ends of the leading edge 112 is an X axis, a straight line perpendicular to the X axis and passing through the end of the leading edge 112 connected to the hub 12 is a Y axis, and the linear equation of the leading edge 112 is:
Figure BDA0002467187100000151
where k is a coefficient, L is a distance between two ends of the leading edge 112 on the X-axis, θ is an angle between a line connecting a point on the leading edge 112 and an origin of the XY coordinate system and the X-axis, X is a perpendicular distance from the point on the leading edge 112 to the Y-axis, and Y is a perpendicular distance from the point on the leading edge 112 to the X-axis.
In the linear equation of the leading edge 112, k is a coefficient with a value ranging from 0.1 to 10, and the distance L between the two ends of the leading edge 112 is the length of the connecting line between the two ends of the arc segment, and the positive direction of the X axis is the direction from the end of the leading edge 112 connected to the hub 12 to the end of the leading edge 112 connected to the first arc segment 1131, and the positive direction of the Y axis is the direction from the end of the leading edge 112 connected to the hub 12 to the side of the blade 11, the intersection point of the Y axis and the X axis is the positive direction of the XY coordinate system, and the Y axis and the X axis are 90 degrees, the transverse coordinate of the point on the leading edge 112 is X, and the longitudinal coordinate of the point is y., so that the profile 112 is in the most speed reduction line, so that the airflow from the leading edge 112 to the leading edge 112 flows along the radial direction of the arc segment, and the airflow flowing along the tip of the arc segment 112 is more smoothly guided along the radial direction of the outer edge of the arc segment, and the blade tip 13, so that the airflow flowing along the arc segment is more smoothly and the outer edge 112 is more smoothly prevented from flowing along the tip of the outer edge 12, and the flow of the arc segment, and the flow of the arc segment is prevented from flowing along the flow of the outer edge 112.
Alternatively, as shown in fig. 1, 3, and 6, the forward projection of the connection between the leading edge 112 and the first arc-shaped segment 1131 on a plane perpendicular to the axis of the hub 12 is arc-shaped or elliptical arc-shaped.
In this embodiment, the joint between the first arc-shaped section 1131 of the outer edge 113 of the blade 1 and the front edge 112 of the blade 1 is rounded, so that the joint between the first arc-shaped section 1131 and the front edge 112 is arc-shaped or elliptical, thereby improving the safety of the blade 11 and preventing the blade 11 from scratching human body; and the arc or the elliptical arc is in smooth transition with the front edge 112 and the first arc-shaped section 1131, so as to ensure that the high-order curvature of the curve of the blade 11 at the blade tip is continuous, and inhibit the separation of the airflow at the blade tip, thereby improving the aerodynamic performance of the axial flow blade 1.
The invention also provides a fan assembly, which comprises a flow guide ring 2 and the axial flow fan blade 1, wherein the axial flow fan blade 1 and the flow guide ring 2 are coaxially arranged; the deflector ring 2 comprises a first air guiding part 21, a second air guiding part 22 and a third air guiding part 23 which are connected in sequence, air flow flowing into the deflector ring 2 flows in from the first air guiding part 21 and flows out from the third air guiding part 23, and the inner diameter of the end part of the first air guiding part 21 far away from the second air guiding part 22 and the inner diameter of the end part of the third air guiding part 23 far away from the second air guiding part 22 are both larger than the inner diameter of the second air guiding part 22.
When the axial flow fan blade 1 rotates, the airflow passes through the first air guiding part 21, the second air guiding part 22 and the third air guiding part 23 in sequence and finally flows out of the outdoor unit; the inner diameter of the end part of the first air guiding part 21 far away from the second air guiding part 22 and the inner diameter of the end part of the third air guiding part 23 far away from the second air guiding part 22 are both larger than the inner diameter of the second air guiding part 22, so that more air flow enters the second air guiding part 22 from the first air guiding part 21 and then flows out from the third air guiding part 23. According to the fan assembly, the axial flow fan blade 1 and the guide ring 2 which are coaxially arranged are arranged, and the guide wing structure 13 is arranged on the pressure surface of the blade 11 of the axial flow fan blade 1, so that the speed component of airflow flowing from the pressure surface of the blade 11 to the blade top and radially outward along the hub 12 is inhibited, namely, the airflow is prevented from flowing along the hub 12 and radially outward, the airflow flowing through the pressure surface of the blade 11 can be prevented from flowing back to the suction surface side of the blade 11 along the pressure surface from the blade top, namely, the leakage of the airflow at the blade top when the fan blows out is reduced, the air output loss of the fan is reduced, and the air output of the fan is increased; moreover, the guide vane structure 13 is provided to weaken the strength of tip leakage vortex generated by the leakage of the airflow at the tip, thereby reducing the vortex noise of the tip.
Optionally, as shown in fig. 7 and 8, the blade 11 has an outer edge 113, the outer edge 113 includes a first arc-shaped section 1131 and a second arc-shaped section 1132, and a connection point of the first arc-shaped section 1131 and the second arc-shaped section 1132 is located in an area enclosed by the first wind guiding portion 21.
The joint of the first arc-shaped section 1131 and the second arc-shaped section 1132 is located in the area enclosed by the first air guiding portion 21, and the joint of the first arc-shaped section 1131 and the second arc-shaped section 1132 is provided with the guide wing structure 13, that is, the guide wing structure 13 is located in the area enclosed by the first air guiding portion 21, so that when the airflow flows back to the suction surface side from the edge of the end of the pressure surface of the blade 11 away from the hub 12 through the gap between the blade tip and the guide ring 2, the guide wing structure 13 can suppress the speed component of the airflow flowing from the pressure surface of the blade 11 to the blade tip along the radial direction of the hub 12, that is, block the airflow from flowing along the radial direction of the hub 12, prevent the airflow from flowing back to the suction surface side of the blade 11 from the gap between the blade tip and the inner wall of the first air guiding portion 21, and further prevent the airflow flowing from the suction surface side of the blade 11 to the gap between the blade tip and the inner wall of the first air guiding portion 21 from being blocked by the backflow airflow and being, therefore, the leakage amount of the airflow at the blade top when the fan blows out can be further reduced. Moreover, the first air guiding portion 21 and the third air guiding portion 23 are both in a bell mouth shape, because the flow path of the air flow in the flow guiding ring 2 sequentially passes through the first air guiding portion 21, the second air guiding portion 22 and the third air guiding portion 23, the first air guiding portion 21 serves as an inlet arc guide to guide the air flow to flow into the flow guiding ring 2, the third air guiding portion 23 serves as an outlet arc guide to guide the air flow to flow out of the flow guiding ring 2, and the air flow has a velocity component pointing to the axial direction of the hub 12 (i.e. radially inward along the hub 12) when flowing towards the outlet arc guide in the inlet arc guide, so that the air flow can inhibit the flow of the air flow flowing from the pressure surface of the blade 11 to the blade tip, thereby preventing the air flow from generating a vortex and blade tip leakage at the connection of the first arc-shaped section 1131 and the second arc-shaped section 1132, and reducing the leakage amount of the air flow at the blade tip when the; after the air flow enters the third air guiding part 23 in the shape of a bell mouth, the air flow has a radially outward velocity component along the hub 12 when flowing in the outlet arc guide, so that the air flow is diffused radially outward along the hub 12 at the third air guiding part 23 to leave the guide ring 2, and meanwhile, the air pressure of the air flow is reduced, and thus, the air flow leakage cannot occur. So, to lead wing structure 13 and set up the junction of first segmental arc 1131 and second segmental arc 1132 in the region that is located first wind-guiding portion 21 and encloses, the leakage quantity of air current at the blade top department of blade 11 when further having reduced the fan and going out the wind has guaranteed the air output of fan. In addition, because the connection point of the first arc-shaped section 1131 and the second arc-shaped section 1132 is located in the area enclosed by the first air guiding portion 21, most of the first arc-shaped section 1131 is located outside the area enclosed by the first air guiding portion 21, the air flow between the blade 1 and the inside of the outdoor unit has a larger contact area, so that the blade 1 can drive more air flow to blow out of the outdoor unit through the flow guiding ring 2; on the opposite direction with wheel hub 12 direction of rotation, the second segmental arc 1132 that the radius of curvature increases progressively then sets up in water conservancy diversion circle 2, on the direction from the suction surface of blade 11 to the pressure surface, the distance crescent of 2 inner walls of second segmental arc 1132 and water conservancy diversion circle for the air-out passageway of fan has bigger volume, thereby improves the air output of fan.
Optionally, as shown in fig. 6 and 7, the first wind guiding portion 21 is in a bell mouth shape, and an orthographic projection of the first wind guiding portion 21 on a plane parallel to the axis of the hub 12 has two circular arcs, and the two circular arcs are respectively located at two ends of the orthographic projection of the first wind guiding portion 21 in the direction perpendicular to the axis of the hub 12; the ratio of the perpendicular distance from the joint of the first arc-shaped section 1131 and the second arc-shaped section 1132 to the end surface of the first wind guiding part 21 far away from the second wind guiding part 22 to the radius of the arc is between 0.1 and 0.9.
The first air guiding portion 21 is in a bell mouth shape, and a vertical distance from a connection position of the first arc-shaped section 1131 and the second arc-shaped section 1132 to an end surface of the first air guiding portion 21, which is far away from the second air guiding portion 22, is between 0.1 and 0.9, so that the connection position of the first arc-shaped section 1131 and the second arc-shaped section 1132 is located in an area enclosed by the first air guiding portion 21, when the airflow abuts against an inner wall of the first air guiding portion 21 and enters the guide ring 2, the airflow has a radial velocity flowing towards the position of the hub 12, so that the guide wing structure 13 can further guide the airflow to flow on a pressure surface of the blade 11 to balance a centrifugal force of the rotation of the airflow, further block the airflow on the pressure surface of the blade 11 from an outer edge 113 to a side of a suction surface, and reduce a leakage amount of the airflow at a blade tip when the fan is out of wind, therefore, the air output loss of the fan is reduced, the eddy noise of the blade top is reduced, and the air guide efficiency of the axial flow fan blade 1 is improved.
The invention also provides an air conditioner which comprises the axial flow fan blade 1 and/or the fan assembly.
According to the air conditioner, the axial flow fan blade 1 and the guide ring 2 which are coaxially arranged are arranged on the fan assembly, and the guide wing structure 13 is arranged on the pressure surface of the blade 11 of the axial flow fan blade 1, so that the speed component of airflow flowing from the pressure surface of the blade 11 to the blade top and outwards along the radial direction of the hub 12 is inhibited, namely, the airflow is prevented from flowing outwards along the radial direction of the hub 12, the airflow flowing through the pressure surface of the blade 11 can be prevented from flowing back to the side of the suction surface of the blade 11 along the pressure surface, namely, the leakage of the airflow at the blade top when the fan blows out is reduced, the loss of the air output of the fan is reduced, and the air output of the fan is increased; moreover, the guide vane structure 13 is provided to weaken the strength of tip leakage vortex generated by the leakage of the airflow at the tip, thereby reducing the vortex noise of the tip.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (18)

1. The axial flow fan blade (1) is characterized by comprising a hub (12), a blade (11) and a guide wing structure (13), wherein the blade (11) is arranged around the hub (12); two side surfaces of the blade (11) are respectively a suction surface and a pressure surface, and the guide wing structure (13) is convexly arranged at one end, far away from the hub (12), of the pressure surface.
2. The axial fan blade (1) according to claim 1, wherein said blade (11) has an outer edge (113), said outer edge (113) being the edge portion of the end of said blade (11) remote from said hub (12); the guide wing structure (13) is connected with the outer edge (113).
3. The axial fan blade (1) according to claim 2, wherein said outer rim (113) comprises a first arc-shaped segment (1131) and a second arc-shaped segment (1132), the direction from said first arc-shaped segment (1131) to said second arc-shaped segment (1132) being opposite to the rotation direction of said hub (12); and the curvature of the first arc-shaped section (1131) is smaller than the curvature of the second arc-shaped section (1132), and the guide wing structure (13) is positioned at the connection part of the first arc-shaped section (1131) and the second arc-shaped section (1132).
4. The axial flow blade (1) of claim 3, wherein the perpendicular distance from the first arc-shaped segment (1131) to the axis of the hub (12) is constant, and the perpendicular distance from the second arc-shaped segment (1132) to the axis of the hub (12) decreases from the junction of the second arc-shaped segment (1132) with the first arc-shaped segment (1131) to the junction of the second arc-shaped segment (1132) away from the junction.
5. The axial-flow fan blade (1) according to claim 3, wherein the direction of extension of said guide wing structure (13) is opposite to the direction of rotation of said hub (12); wherein the guide wing structure (13) is provided with a large end (131) and a small end (132), and the extending direction of the guide wing structure (13) is the direction from the large end (131) to the small end (132).
6. The axial-flow fan blade (1) of claim 5, wherein the orthographic projection of the guide wing structure (13) on the blade (11) on which the guide wing structure is arranged is wing-shaped; and the distance from the large end (131) to the outer edge (113) is smaller than the distance from the small end (132) to the outer edge (113).
7. The axial fan blade (1) according to claim 5, wherein the angle between the line connecting the large end (131) and the small end (132) and the tangent line at the connection point of the first arc-shaped segment (1131) and the second arc-shaped segment (1132) is less than or equal to 30 °.
8. The axial-flow fan blade (1) according to claim 5, wherein the ratio of the distance from the large end (131) to the small end (132) of the guide wing structure (13) to the arc length of the outer edge (113) of the blade (11) on which the guide wing structure (13) is located is between 0.02 and 0.2.
9. The axial fan blade (1) according to claim 5, wherein the ratio of the height of the protrusion of the guide vane structure (13) to the thickness of the blade (11) at the junction of the first arc-shaped section (1131) and the second arc-shaped section (1132) is between 0.5 and 2; wherein the thickness of the blade (11) is the vertical distance between the suction surface and the pressure surface.
10. The axial-flow fan blade (1) according to claim 5, wherein said blade (11) further has a trailing edge (111), said trailing edge (111) is an edge portion of said blade (11) opposite to the rotation direction of said hub (12), one end of said trailing edge (111) is connected to said hub (12), and the other end is connected to said second arc-shaped section (1132); guide wing structure (13) are equipped with a plurality ofly, and are a plurality of guide wing structure (13) all are located first segmental arc (1131) with the junction of second segmental arc (1132) with trailing edge (111) with between the junction of outer fringe (113), and are a plurality of guide wing structure (13) are followed the direction of rotation interval distribution of hub (12).
11. The axial-flow fan blade (1) according to claim 10, wherein the angle between the vertical line between the large end (131) or the small end (132) of two adjacent guide wing structures (13) and the axis of the hub (12) is greater than or equal to 10 ° and less than or equal to 30 °.
12. The axial-flow fan blade (1) according to any one of claims 3 to 11, wherein the blade (11) further has a leading edge (112), the leading edge (112) is an edge portion of the blade (11) that has the same rotation direction as the hub (12), one end of the leading edge (112) is connected to the hub (12), and the other end is connected to the first arc-shaped section (1131); and the linear shape of the front edge (112) is the steepest descent linear shape.
13. The axial-flow fan blade (1) according to claim 12, wherein an XY coordinate system is established on a plane perpendicular to the axis of the hub (12), a straight line perpendicular to the X axis and passing through one end of the leading edge (112) connected to the hub (12) is an X axis, a straight line perpendicular to the X axis and passing through the end of the leading edge (112) connected to the hub (12) is a Y axis, and the linear equation of the leading edge (112) is:
Figure FDA0002467187090000031
wherein k is a coefficient, L is a distance between two ends of the leading edge (112) on the X-axis, θ is an angle between a line connecting a point on the leading edge (112) and an origin of the XY-coordinate system and the X-axis, X is a perpendicular distance from the point on the leading edge (112) to the Y-axis, and Y is a perpendicular distance from the point on the leading edge (112) to the X-axis.
14. The axial-flow fan blade (1) according to claim 12, wherein the orthogonal projection of the connection of the leading edge (112) and the first arc-shaped segment (1131) on a plane perpendicular to the axis of the hub (12) is in the shape of an arc or an elliptical arc.
15. A fan assembly, characterized by comprising a flow guiding ring (2) and an axial flow fan blade (1) according to any one of claims 1 to 14, wherein the axial flow fan blade (1) is coaxially arranged with the flow guiding ring (2); the flow guide ring (2) comprises a first air guide part (21), a second air guide part (22) and a third air guide part (23) which are sequentially connected, air flow flowing into the flow guide ring (2) flows in from the first air guide part (21) and flows out from the third air guide part (23), and the inner diameter of the end part, far away from the second air guide part (22), of the first air guide part (21) and the inner diameter of the end part, far away from the second air guide part (22), of the third air guide part (23) are both larger than the inner diameter of the second air guide part (22).
16. The fan assembly of claim 15, wherein the blade (11) has an outer edge (113), the outer edge (113) comprises a first arc-shaped section (1131) and a second arc-shaped section (1132), and a connection point of the first arc-shaped section (1131) and the second arc-shaped section (1132) is located in an area surrounded by the first wind guiding portion (21).
17. The fan assembly according to claim 16, wherein the first wind guiding portion (21) is in a shape of a bell mouth, and an orthographic projection of the first wind guiding portion (21) on a plane parallel to an axis of the hub (12) has two circular arcs, and the two circular arcs are respectively located at two ends of the orthographic projection of the first wind guiding portion (21) in a direction perpendicular to the axis of the hub (12); the ratio of the vertical distance from the joint of the first arc-shaped section (1131) and the second arc-shaped section (1132) to the end face, away from the second air guiding part (22), of the first air guiding part (21) to the radius of the arc is between 0.1 and 0.9.
18. An air conditioner, characterized in that it comprises an axial fan blade (1) according to any one of claims 1 to 14, and/or a fan assembly according to any one of claims 15 to 17.
CN202010337597.4A 2020-04-26 2020-04-26 Axial flow fan blade, fan assembly and air conditioner with same Active CN111441977B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010337597.4A CN111441977B (en) 2020-04-26 2020-04-26 Axial flow fan blade, fan assembly and air conditioner with same

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010337597.4A CN111441977B (en) 2020-04-26 2020-04-26 Axial flow fan blade, fan assembly and air conditioner with same

Publications (2)

Publication Number Publication Date
CN111441977A true CN111441977A (en) 2020-07-24
CN111441977B CN111441977B (en) 2024-07-02

Family

ID=71654456

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202010337597.4A Active CN111441977B (en) 2020-04-26 2020-04-26 Axial flow fan blade, fan assembly and air conditioner with same

Country Status (1)

Country Link
CN (1) CN111441977B (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113757171A (en) * 2021-10-13 2021-12-07 珠海格力电器股份有限公司 Blade assembly, axial flow fan and design method of blade tip winglet
CN114688049A (en) * 2020-12-25 2022-07-01 广东美的白色家电技术创新中心有限公司 Fan subassembly and air conditioner
CN115264599A (en) * 2022-08-04 2022-11-01 珠海格力电器股份有限公司 Guiding device, fan and air conditioner

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003184792A (en) * 2001-12-21 2003-07-03 Daikin Ind Ltd Blower
CN102828996A (en) * 2011-06-14 2012-12-19 珠海格力电器股份有限公司 Axial fan
KR20140039976A (en) * 2012-09-24 2014-04-02 삼성전자주식회사 Propeller fan
CN106837871A (en) * 2017-03-22 2017-06-13 广东美的制冷设备有限公司 Axial-flow windwheel, axial flow blower and air-conditioner
CN206957984U (en) * 2017-04-21 2018-02-02 广东森博科瑞莱空气制冷有限公司 A kind of reducing blade and fan blade and axial flow blower with reducing blade
CN108087330A (en) * 2017-11-27 2018-05-29 珠海格力电器股份有限公司 Blade structure and air conditioner with same
CN212130847U (en) * 2020-04-26 2020-12-11 宁波奥克斯电气股份有限公司 Axial flow fan blade, fan assembly and air conditioner thereof

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003184792A (en) * 2001-12-21 2003-07-03 Daikin Ind Ltd Blower
CN102828996A (en) * 2011-06-14 2012-12-19 珠海格力电器股份有限公司 Axial fan
KR20140039976A (en) * 2012-09-24 2014-04-02 삼성전자주식회사 Propeller fan
CN106837871A (en) * 2017-03-22 2017-06-13 广东美的制冷设备有限公司 Axial-flow windwheel, axial flow blower and air-conditioner
CN206957984U (en) * 2017-04-21 2018-02-02 广东森博科瑞莱空气制冷有限公司 A kind of reducing blade and fan blade and axial flow blower with reducing blade
CN108087330A (en) * 2017-11-27 2018-05-29 珠海格力电器股份有限公司 Blade structure and air conditioner with same
CN212130847U (en) * 2020-04-26 2020-12-11 宁波奥克斯电气股份有限公司 Axial flow fan blade, fan assembly and air conditioner thereof

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114688049A (en) * 2020-12-25 2022-07-01 广东美的白色家电技术创新中心有限公司 Fan subassembly and air conditioner
CN114688049B (en) * 2020-12-25 2024-02-20 广东美的白色家电技术创新中心有限公司 Fan assembly and air conditioner
CN113757171A (en) * 2021-10-13 2021-12-07 珠海格力电器股份有限公司 Blade assembly, axial flow fan and design method of blade tip winglet
CN113757171B (en) * 2021-10-13 2023-08-25 珠海格力电器股份有限公司 Blade assembly, axial flow fan and design method of small blade tip wing
CN115264599A (en) * 2022-08-04 2022-11-01 珠海格力电器股份有限公司 Guiding device, fan and air conditioner

Also Published As

Publication number Publication date
CN111441977B (en) 2024-07-02

Similar Documents

Publication Publication Date Title
US11506211B2 (en) Counter-rotating fan
CN111441977B (en) Axial flow fan blade, fan assembly and air conditioner with same
EP2213882B1 (en) Centrifugal fan
JP5495700B2 (en) Centrifugal compressor impeller
JP2015034503A (en) Axial fan and air conditioner having axial fan
CN108825552B (en) Air treatment equipment, fan and centrifugal fan blade thereof
CN104641121A (en) Propeller fan and air conditioner equipped with same
CN111577655B (en) Blade and axial flow impeller using same
CN110513329B (en) Axial-flow wind wheel and air conditioner with same
CN106593950B (en) Blade, centrifugal fan impeller, centrifugal fan and range hood
CN113757171B (en) Blade assembly, axial flow fan and design method of small blade tip wing
CN212130847U (en) Axial flow fan blade, fan assembly and air conditioner thereof
CN111379746A (en) Fan and hairdryer
CN108005956B (en) Volute structure for automobile air conditioner
CN212479700U (en) Fan and hairdryer
CN111878455A (en) Centrifugal impeller, centrifugal fan and refrigeration equipment
CN215293004U (en) Blade, impeller, centrifugal fan and range hood
CN210686426U (en) Axial flow wind wheel and air conditioner with same
CN212868015U (en) Blade of fan
CN209012125U (en) Axial-flow windwheel and warm-air drier
JPH04143499A (en) Diffuser of centrifugal fluid machine
CN217873415U (en) Blade and impeller, forward centrifugal fan and range hood with same
CN214063377U (en) S-shaped axial flow blade profile and axial flow wind wheel with same
CN212868014U (en) Low-noise centrifugal fan blade
CN215637547U (en) Air conditioner indoor unit and air conditioner

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant