CN113757168A - Fan blade, fan, air condensing units and air conditioning system - Google Patents

Fan blade, fan, air condensing units and air conditioning system Download PDF

Info

Publication number
CN113757168A
CN113757168A CN202010483228.6A CN202010483228A CN113757168A CN 113757168 A CN113757168 A CN 113757168A CN 202010483228 A CN202010483228 A CN 202010483228A CN 113757168 A CN113757168 A CN 113757168A
Authority
CN
China
Prior art keywords
blade
fan
blades
hub
stage
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
CN202010483228.6A
Other languages
Chinese (zh)
Inventor
胡小文
胡斯特
詹东文
张龙新
李跃飞
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.)
Midea Group Co Ltd
GD Midea Heating and Ventilating Equipment Co Ltd
Guangdong Midea White Goods Technology Innovation Center Co Ltd
Original Assignee
Midea Group Co Ltd
GD Midea Heating and Ventilating Equipment Co Ltd
Guangdong Midea White Goods Technology Innovation Center 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 Midea Group Co Ltd, GD Midea Heating and Ventilating Equipment Co Ltd, Guangdong Midea White Goods Technology Innovation Center Co Ltd filed Critical Midea Group Co Ltd
Priority to CN202010483228.6A priority Critical patent/CN113757168A/en
Priority to PCT/CN2020/129502 priority patent/WO2021243969A1/en
Publication of CN113757168A publication Critical patent/CN113757168A/en
Pending legal-status Critical Current

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
    • 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
    • F04D29/384—Blades characterised by form
    • F04D29/386—Skewed blades
    • 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
    • F04D25/00—Pumping installations or systems
    • F04D25/16—Combinations of two or more pumps ; Producing two or more separate gas flows
    • 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
    • F04D25/16—Combinations of two or more pumps ; Producing two or more separate gas flows
    • F04D25/166—Combinations of two or more pumps ; Producing two or more separate gas flows using 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
    • 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
    • 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
    • F04D29/667—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps by influencing the flow pattern, e.g. suppression of turbulence
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
    • F24F1/38—Fan details of outdoor units, e.g. bell-mouth shaped inlets or fan mountings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F1/00—Room units for air-conditioning, e.g. separate or self-contained units or units receiving primary air from a central station
    • F24F1/06—Separate outdoor units, e.g. outdoor unit to be linked to a separate room comprising a compressor and a heat exchanger
    • F24F1/46—Component arrangements in separate outdoor units

Abstract

The invention provides a fan blade, a fan, an air conditioner outdoor unit and an air conditioning system, wherein the fan blade comprises: a hub; the blade is arranged on the hub and comprises a blade front edge and a blade tail edge; wherein, along wheel hub's radial direction, the outline line of blade trailing edge includes first bight and second bight, and first bight is protruding to one side of keeping away from the blade leading edge, and the second bight is protruding towards one side of blade leading edge. According to the fan blade provided by the invention, the contour line of the blade tail edge of the blade is designed to be in the form of the bent part with the opposite protruding direction, so that the noise generated by the leakage vortex of the fan blade is reduced, the noise generated by the interference action of the leakage vortex and other blades is reduced, the fan efficiency is improved while the leakage flow is reduced, further, the damage to the fan blade caused by high load is avoided, and the use stability and the service life of the fan blade are improved.

Description

Fan blade, fan, air condensing units and air conditioning system
Technical Field
The invention relates to the technical field of household appliances, in particular to a fan blade, a fan, an air conditioner outdoor unit and an air conditioning system.
Background
At present, the design of the counter-rotating blades is widely applied to various fields, and the counter-rotating blades have the advantages of being compact in structure, having no guide vanes, and being capable of generating two-stage static pressure.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art or the related art.
To this end, a first aspect of the invention proposes a fan blade.
The second aspect of the present invention provides a fan blade.
A third aspect of the invention provides a wind turbine.
A fourth aspect of the present invention provides an outdoor unit of an air conditioner.
A fifth aspect of the present invention provides an air conditioning system.
In view of the above, the first aspect of the present invention provides a fan blade, including: a hub; the blades are arranged on the hub and comprise blade front edges and blade tail edges which are respectively positioned at two sides of the blades along the rotation direction of the hub; wherein, along wheel hub's radial direction, the outline line of blade trailing edge includes first bight and second bight, and first bight is protruding to one side of keeping away from the blade leading edge, and the second bight is protruding towards one side of blade leading edge.
The present invention provides a fan blade, comprising: the blade comprises a blade leading edge positioned on one side of the blade and a blade trailing edge positioned on the other side of the blade, and the contour line of the blade trailing edge of the blade comprises two bent parts with opposite protruding directions, wherein the first bent part protrudes to one side far away from the blade leading edge, and the second bent part protrudes to one side of the blade leading edge, so that the blade top load can be obviously reduced, the flow of a subsurface flow from a pressure surface to a suction surface is reduced, and the strength of a blade top leakage vortex is inhibited.
According to the fan blade provided by the invention, the contour line of the blade trailing edge of the blade is designed to be in the form of two bent parts with opposite protruding directions, so that the blade top load and the flow of the undercurrent from the pressure surface to the suction surface are reduced, the strength of the blade top leakage vortex is inhibited, the noise generated by the leakage vortex of the fan blade is reduced, the noise generated by the interference action of the leakage vortex and other blades is reduced, the high noise problem caused by high pressure pulsation is avoided, the fan efficiency is improved by reducing the leakage flow, further, the structure is prevented from damaging the structure of the fan blade caused by the high load caused by the leakage vortex, and the use stability and the service life of the fan blade are improved.
In addition, according to the fan blade in the above technical solution provided by the present invention, the following additional technical features may also be provided:
in any of the above technical solutions, further, the blade further includes: a free end; the connecting end is connected with the hub; the middle blade section is positioned between the connecting end and the free end; the chord length of the free end position is larger than that of the middle blade section and the connecting end position.
In the technical scheme, the blades are arranged to be of a structure that the chord length of the free end is larger than that of the middle blade section and the chord length of the connecting end, so that the wind power provided by the fan can be further improved, the applicable range of the fan is wider, the universality of the fan is improved, the blade top load and the flow of the undercurrent from the pressure surface to the suction surface are reduced, the strength of blade top leakage vortex is inhibited, the noise of the fan is reduced, and the use stability and the service life of the fan blade are improved.
In any of the above technical solutions, further, from the connecting end to the free end, the contour line of the blade leading edge gradually extends forward in the rotation direction of the hub.
In this technical scheme, by the direction of link to free end, set up the profile line of blade leading edge into the form that extends towards the direction of rotation of wheel hub gradually, form the structure of forward bend promptly, can make the flabellum adapt to complicated blade leading edge air current to reduce with the produced interference of other blades, further reduced fan noise.
In any one of the above technical solutions, further, along the direction from the connecting end to the free end, the contour line of the trailing edge of the blade further includes a third bent portion, the third bent portion is connected with the second bent portion, and the third bent portion protrudes toward the side away from the leading edge of the blade.
In the technical scheme, the contour line of the blade trailing edge of the blade is designed to comprise three bent parts, and the protruding directions of any two connected bent parts are different, so that the reduction of the blade top load and the flow of the undercurrent from the pressure surface to the suction surface are realized, the strength of the blade top leakage vortex is inhibited, the noise generated by the leakage vortex is reduced, the noise generated by the leakage vortex and the noise generated by the interference effect of other blades are reduced, the high-noise problem caused by high pressure pulsation is avoided, the fan efficiency is improved by reducing the leakage flow, and further, the damage to the structure of the blade caused by the high load caused by the leakage vortex is avoided by the structure, and the use stability and the service life of the blade are improved.
According to a second aspect of the present invention, there is provided a fan blade, comprising: a hub; the blades are arranged on the hub and comprise blade front edges and blade tail edges which are respectively positioned at two sides of the blades along the rotation direction of the hub; the blade tail edge and the hub are connected with each other through a first connecting line, the first connecting line is arranged between the intersection point of the blade tail edge and the hub and the axis of the hub, the axis of the hub is used as the center of a circle, the radius of the second connecting line is R, the intersection point of the circle and the blade tail edge and the axis of the hub are connected with each other through a second connecting line, and the included angle formed by the first connecting line and the second connecting line is increased and then reduced along with the increase of the radius R; the radius R is larger than the radius of the hub and smaller than the distance from the free end of the blade to the axis.
According to the fan blade, a connecting line between the intersection point of the tail edge of the fan blade and the hub and the axis of the hub is designated as a first connecting line; a connecting line between the intersection point of a circle with the radius R and the tail edge of the blade and the axis of the hub is designated as a second connecting line, the included angle formed by the first connecting line and the second connecting line is increased and then reduced along with the increase of the radius R, the structural design of the tail edge of the blade is further optimized, the contour line of the tail edge of the blade is of a spoon-shaped structure, the reduction of the blade top load and the flow of the undercurrent from a pressure surface to a suction surface are realized, the strength of a blade top leakage vortex is inhibited, the noise generated by the leakage vortex is reduced, the noise generated by the leakage vortex and the interference effect generated by other blades is also reduced, and the problem of high noise generated by high pressure pulsation is avoided, meanwhile, the efficiency of the fan is improved due to the reduction of leakage flow, the damage to the structure of the fan blade due to high load caused by leakage vortex is further avoided, and the use stability and the service life of the fan blade are improved.
In the above technical solution, further, the blade includes a connection end and a free end, the connection end is connected with the hub; the inflection point of which the included angle is increased and then reduced is positioned in the interval of 60 to 90 percent of the blade height of the blade; the blade height is the distance between the connecting end and the free end along the radial direction of the hub.
In the technical scheme, the inflection point with the included angle increased firstly and then reduced is arranged in the interval of 60-90% of the blade height of the blade, so that the load of the upper half part of the blade is higher by 60-90%, the spoon-shaped tail edge structure is formed, the running rotating speed of the fan when the fan reaches the same air volume and air pressure level can be reduced, the rim speed of the fan is reduced, and the brought direct action effect is that the noise of the fan is reduced.
In any of the above technical solutions, further, in a direction from the connecting end to the free end, as the radius R decreases, the chord length of the blade corresponding to the radius R decreases and then increases.
In the technical scheme, the chord length of the blade is set to be the structure which is firstly reduced and then increased along with the reduction of the radius R from the connecting end to the free end, so that the blade top load and the flow of the undercurrent from the pressure surface to the suction surface are further reduced, the strength of the blade top leakage vortex is inhibited, the noise of the fan is reduced, the efficiency of the fan is improved, the service stability of the fan blade is improved, and the service life of the fan blade is prolonged. Moreover, the design with shorter middle chord length can lead each blade to be lighter, thereby reducing the dead weight of the whole fan.
In any of the above technical solutions, further, the blade further includes: the middle blade section is positioned between the connecting end and the free end; the chord length corresponding to the free end is larger than that corresponding to the blade middle section and the connecting end.
In the technical scheme, the blades are arranged to be of a structure that the chord length of the free end is larger than that of the middle blade section and the chord length of the connecting end, so that the wind power provided by the fan can be further improved, the applicable range of the fan is wider, the universality of the fan is improved, the blade top load and the flow of the undercurrent from the pressure surface to the suction surface are reduced, the strength of blade top leakage vortex is inhibited, the noise of the fan is reduced, and the use stability and the service life of the fan blade are improved.
In any of the above technical solutions, further, from the connecting end to the free end, the contour line of the blade leading edge gradually extends forward in the rotation direction of the hub.
In this technical scheme, by the direction of link to free end, set up the profile line of blade leading edge into the form that extends towards the direction of rotation of wheel hub gradually, form the structure of forward bend promptly, can make the flabellum adapt to complicated blade leading edge air current to reduce with the produced interference of other blades, further reduced fan noise.
In any of the above technical solutions, further, as the radius R increases, an included angle formed by the first connection line and the second connection line increases first, then decreases, and then increases.
In the technical scheme, as the radius R is increased, an included angle formed by the first connecting line and the second connecting line is increased and then decreased, and then is increased. The contour line of the trailing edge of the blade is set to be a multi-bending structure, and at least two inflection points are formed on the included angle between the connecting end and the free end of the blade, so that the curve setting is adopted to reduce the blade top load and the flow of the undercurrent from the pressure surface to the suction surface, the strength of the blade top leakage vortex is inhibited, the noise is reduced, and meanwhile, the fan efficiency is improved due to the reduction of the leakage flow.
According to a third aspect of the present invention, there is also provided a fan comprising: the first-stage fan blade comprises the fan blade in any one of the technical schemes; a second stage fan blade; the driving assembly is connected with the first-stage fan blades and the second-stage fan blades, wherein the rotating directions of the first-stage fan blades and the second-stage fan blades are opposite, the first-stage fan blades are upstream fan blades, and the second-stage fan blades are downstream fan blades; along the rotating direction of the first-stage fan blades, the front edges of the blades of the first-stage fan blades are positioned in front of the tail edges of the blades.
According to the fan provided by the invention, the driving assembly is connected with the first-stage fan blade and the second-stage fan blade, and the rotation directions of the first-stage fan blade and the second-stage fan blade are opposite, so that the counter rotation of the second-stage fan is realized, and higher wind pressure can be provided. Further, along the incoming flow direction of the airflow, the first stage fan blades located in front are upstream fan blades, and the second stage fan blades located in rear are downstream fan blades. Wherein, the first-stage flabellum is because of including above-mentioned flabellum of any technical scheme, along the direction of rotation of first-stage flabellum, the blade leading edge of the blade of first-stage flabellum is located the place ahead of blade trailing edge, and then realized reducing the flow of the undercurrent of blade top load and from the pressure surface to the suction surface, the intensity of blade top leakage vortex has been suppressed, also reduced the noise that produces because of the interference effect that the vortex produced with the second level flabellum when reducing the noise that self produces because of the leakage vortex, the high noise problem of having avoided forming because of higher pressure pulsation, the mechanical energy that two-stage flabellum loss has also been brought in the reduction of leakage flow simultaneously reduces, the fan efficiency has been improved, furtherly, this fan has also avoided causing the damage to flabellum self structure because of the high load that the leakage vortex brought, the stability in utilization and the life of fan have been promoted.
In the above technical solution, further, the second-stage fan blade includes the fan blade in any of the above technical solutions; and the front edge of the blade of the second-stage fan blade is positioned in front of the tail edge of the blade along the rotation direction of the second-stage fan blade.
In this technical solution, since the second-stage fan blade includes the fan blade of any one of the above technical solutions, all the beneficial effects of the fan blade are achieved, and are not described herein again.
In any of the above technical solutions, further, the driving assembly includes: a motor; the first output shaft is connected with the motor, the output end of the first output shaft is connected with the first-stage fan blades, and the first output shaft is provided with an axial through hole; the second output shaft penetrates through the through hole, one end of the second output shaft is connected with the motor, and the other end of the second output shaft is connected with the second-stage fan blades; wherein, the rotation directions of the first output shaft and the second output shaft are opposite.
In this technical scheme, drive assembly includes the motor, first output shaft, the second output shaft, concretely, first output shaft one end links to each other with the motor, the output links to each other with first order flabellum, make the power transmission of motor give first order flabellum, the second output shaft wears to locate in the axial through hole of first output shaft through nested connection's mode, second output shaft one end links to each other with the motor, the output links to each other with the second order flabellum, make the power transmission of motor give the second order flabellum, and make it rotate towards the direction opposite with first order flabellum direction of rotation, make the second order flabellum form the disrotatory, provide higher wind pressure.
In any of the above technical solutions, further, the driving assembly includes: a first motor; the first output shaft is connected with the first motor, and the output end of the first output shaft is connected with the first-stage fan blades; a second motor; the output end of the second output shaft is connected with the second-stage fan blades; wherein, the rotation directions of the first output shaft and the second output shaft are opposite.
In this technical scheme, drive assembly includes first motor, first output shaft, the second motor, the second output shaft, concretely, the one end of first output shaft links to each other with first motor, the output links to each other with first order flabellum, make the power transmission of first motor make its rotation for first order flabellum, the one end of second output shaft links to each other with the second motor, the output links to each other with second order flabellum, and make it rotate towards the direction opposite with first order flabellum direction of rotation, make the second order flabellum form the disrotatory, provide higher wind pressure, and the mode modularization that controls a flabellum respectively through two motors is strong, realize more easily.
Furthermore, the air conditioner outdoor unit also comprises a first motor bracket, and a first motor of the fan is arranged on the first motor bracket; and the second motor of the fan is arranged on the second motor support. The first motor of the fan is arranged on the first motor support, and the second motor of the fan is arranged on the second motor support, so that the two motors of the fan are fixedly arranged on the air conditioner outdoor unit, relative movement cannot occur, and the fan and the air conditioner outdoor unit are assembled.
In any of the above technical solutions, further, the fan is projected along the rotation axis direction of the first-stage blades, and the intersection included angle between the blade trailing edge contour line corresponding to the blades of the first-stage blades and the blade leading edge contour line corresponding to the blades of the second-stage blades in the projection plane is greater than 20 °.
In this technical scheme, in the projection plane that carries out the projection to the fan along the axis of rotation direction of first order flabellum, through being greater than 20 arranging with the blade trailing edge contour line that the blade of first order flabellum corresponds and the blade leading edge contour line that the blade of second order flabellum corresponds, can reduce the flow phase place interference of the blade trailing edge of first order flabellum and the blade leading edge of second order flabellum to reduce interference noise.
According to the fourth aspect of the present invention, there is also provided an outdoor unit of an air conditioner, comprising: the shell is provided with an air outlet; the air guide ring is arranged at the air outlet; and the fan is arranged on the shell and positioned in the air guide ring.
The air conditioner outdoor unit provided by the invention comprises the fan in any technical scheme, so that the air conditioner outdoor unit has all the beneficial effects of the fan, and is not repeated herein.
In the above technical solution, further, the outdoor unit of an air conditioner further includes third stage fan blades, and the third stage fan blades are disposed on the air guide ring and distributed along the circumferential side of the inner ring of the air guide ring.
In the technical scheme, the third-stage fan blades are arranged on the outdoor unit of the air conditioner, so that the pressure of the fan can be further increased, the applicable range of the outdoor unit is wider, and the universality of the outdoor unit of the air conditioner is improved.
In any of the above technical solutions, further, the third stage fan blade is located between the first stage fan blade and the second stage fan blade; and/or the third stage fan blade is positioned between the first stage fan blade and the inlet end of the air outlet; the third stage fan blade is positioned between the second stage fan blade and the outlet end of the air outlet.
In this technical scheme, the third level flabellum can set up multiple positions in the fan, can further promote fan pressure, and first order flabellum and second level flabellum include the flabellum of any one of above-mentioned technical scheme, consequently have all beneficial effects of this flabellum, no longer give consideration to here.
Further, the third stage fan blade may be a stationary blade, or may be a dynamic blade having the fan blade according to any of the above-described embodiments.
According to a fifth aspect of the present invention, there is also provided an air conditioning system comprising: the fan of any one of the above technical schemes; or the air conditioner outdoor unit according to any one of the above technical solutions.
The air conditioning system provided by the invention comprises the fan in any technical scheme or the air conditioning outdoor unit in any technical scheme, so that the air conditioning system has all the beneficial effects of the fan or the air conditioning outdoor unit, and is not repeated herein.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 shows a view of a fan blade of one embodiment of the present invention;
FIG. 2 shows a left side view of the fan blade of the embodiment of FIG. 1;
FIG. 3 shows the relationship between the radius R and the angle formed by the first connecting line and the second connecting line in the fan blade of the embodiment shown in FIG. 1;
FIG. 4 is a schematic view of a leakage vortex structure of a fan blade in the embodiment of FIG. 1;
FIG. 5 shows a view of a fan blade of yet another embodiment of the present invention;
FIG. 6 shows the relationship between the radius R and the angle formed by the first connecting line and the second connecting line in the fan blade of the embodiment shown in FIG. 5;
FIG. 7 illustrates a schematic structural diagram of a wind turbine according to an embodiment of the present invention;
FIG. 8 is an axial view of the second stage fan blade of the embodiment of FIG. 7;
FIG. 9 is a side view of the second stage fan blade of the embodiment of FIG. 7;
FIG. 10 shows an axial view of the blower of the embodiment of FIG. 7;
fig. 11 is a schematic structural view illustrating an outdoor unit of an air conditioner according to an embodiment of the present invention;
FIG. 12 is a graph comparing experimental data for noise generated by a fan as provided herein with noise generated by a fan of the prior art.
Wherein, the correspondence between the reference numbers and the part names in fig. 1 to 11 is:
100 fan blades, 102 hub, 104 blades, 106 blade leading edges, 108 blade trailing edges, 110 first bending parts, 112 second bending parts, 114 connecting ends, 116 free ends, 118 blade middle sections, 120 blade tip leakage vortexes, 122 suction surfaces, 124 pressure surfaces, 126 third bending parts, 200 fans, 202 first-stage fan blades, 204 second-stage fan blades, 206 motors, 208 first output shafts, 210 second output shafts, 300 air conditioner outdoor units, 302 shells, 304 air outlets and 306 air guide rings.
Detailed Description
In order that the above objects, features and advantages of the present invention can be more clearly understood, a more particular description of the invention will be rendered by reference to the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.
The fan blades 100, the fan 200, and the outdoor unit 300 according to some embodiments of the present invention will be described with reference to fig. 1 to 12.
Example one
As shown in fig. 1, fig. 2 and fig. 4, a first aspect of the present invention provides a fan blade 100, including: a hub 102 and blades 104, the blades 104 being arranged on the hub 102.
The blade 104 includes a blade leading edge 106 and a blade trailing edge 108 located at two sides of the blade, and the blade leading edge 106 is located in front of the blade trailing edge 108 along the rotation direction of the hub 102; in the radial direction of the hub 102, the contour line of the blade trailing edge 108 includes a first curved portion 110 and a second curved portion 112, the first curved portion 110 is convex toward the side far away from the blade leading edge 106, and the second curved portion 112 is convex toward the side of the blade leading edge 106.
The present invention provides a fan blade 100, including: the blade comprises a hub 102 and a plurality of blades 104, wherein the plurality of blades 104 are arranged on the hub along the circumferential side of the hub 102, the blades 104 comprise a blade leading edge 106 positioned in the front in the rotation direction and a blade trailing edge 108 positioned in the rear, the contour line of the blade trailing edge 108 of the blades 104 comprises two bent parts with opposite protruding directions, wherein the first bent part 110 protrudes to the side far away from the blade leading edge 106, and the second bent part 112 protrudes to the side of the blade leading edge 106, so that the blade top load can be obviously reduced, the flow rate of a potential flow from a pressure surface 124 to a suction surface 122 can be reduced, and the blade top leakage vortex 120 can be inhibited.
According to the fan blade 100 provided by the invention, the contour line of the blade trailing edge 108 of the blade 104 is designed to comprise two bending parts with opposite protrusion directions, so that the blade top load and the flow of the undercurrent from the pressure surface 124 to the suction surface 122 are reduced, the flow strength of the blade top leakage vortex 120 is inhibited, the noise generated by the blade top leakage vortex 120 and the noise generated by the interference action of the leakage vortex and other blades are reduced, the high noise problem caused by high pressure pulsation is avoided, the fan efficiency is improved by reducing the leakage flow, further, the structure also avoids the damage to the structure of the fan blade caused by the high load caused by the leakage vortex, and the use stability and the service life of the fan blade are improved.
Example two
As shown in fig. 1, fig. 2, fig. 3 and fig. 4, the present invention provides a fan blade 100, including: hub 102, blades 104; wherein, the blade 104 is disposed on the hub 102, the blade 104 includes a blade leading edge 106 on one side of the blade and a blade trailing edge 108 on the other side of the blade; in the radial direction of the hub 102, the contour line of the blade trailing edge 108 includes a first curved portion 110 and a second curved portion 112, the first curved portion 110 is convex toward the side far away from the blade leading edge 106, and the second curved portion 112 is convex toward the side of the blade leading edge 106.
Further, as shown in fig. 1, the blade includes a connecting end 114 and a free end 116, the connecting end 114 being connected with the hub 102; a midship section 118, the midship section being located between the connection end 114 and the free end 116; the chord length corresponding to the free end 116 is larger than the chord length corresponding to the midship section 118 and the connecting end 114.
In this embodiment, by setting the chord length of the free end 116 to be greater than the chord length of the midship 118 and the connecting end 114, the wind power provided by the fan can be further increased, the applicable range of the fan can be wider, the versatility of the fan can be improved, the blade tip load and the flow rate of the latent flow from the pressure surface 124 to the suction surface 122 can be reduced, the flow strength of the tip leakage vortex 120 can be suppressed, the fan noise can be reduced, and the service stability and the service life of the fan blade can be improved.
In any of the above embodiments, as shown in fig. 1, further, the contour of the blade leading edge 106 gradually extends forward in the rotation direction of the hub 102 from the connecting end 114 to the free end 116.
In this embodiment, the contour of the leading edge 106 of the blade is gradually extended toward the rotation direction of the hub 102 from the connecting end 114 to the free end 116, i.e., a forward-curved structure is formed, so that the blade can adapt to the complicated leading edge airflow of the blade, and the interference with other blades is reduced, thereby further reducing the fan noise.
Further, as shown in fig. 5, in one embodiment of the present application, the contour of the blade trailing edge 108 along the direction from the connecting end 114 to the free end 116 further includes a third curved portion 126, the third curved portion 126 is connected to the second curved portion 112, and the third curved portion 126 is convex toward the side away from the blade leading edge 106.
In this technical scheme, through the profile line design of the blade trailing edge 108 with blade 104 for including three curved portion, and the protruding different forms of direction of arbitrary two consecutive curved portions, through setting up a plurality of unsmooth curved portions, can adjust the air current by the free end of blade to the link, and then can reduce the flow of blade top load and the undercurrent from pressure surface 124 to suction surface 122, and then can reduce the flow strength of leakage vortex.
EXAMPLE III
A second aspect of the present invention provides a fan blade 100, comprising: the blade 104 comprises a blade leading edge 106 and a blade trailing edge 108 which are positioned on two sides of the blade, and the blade leading edge 106 is positioned in front of the blade trailing edge 108 along the rotation direction of the hub 102.
As shown in fig. 1 to 4, along a first connecting line a between an intersection point of the blade trailing edge 108 and the hub 102 and an axis of the hub 102, a second connecting line b between an intersection point of a circle with a radius R and the blade trailing edge 108 and the axis of the hub 102 is taken as a circle center, and an included angle β formed by the first connecting line and the second connecting line increases and then decreases with the increase of the radius R; the radius R is larger than the radius of the hub 102 and smaller than the distance from the free end 116 to the axis, through the arrangement, the structural design of the blade trailing edge 108 is further optimized, the contour line of the blade trailing edge 108 is of a spoon-shaped structure, the blade top load and the flow of the underflow from the pressure surface 124 to the suction surface 122 are reduced, the strength of the blade top leakage vortex 120 is inhibited, the noise generated by the blade top leakage vortex 120 is reduced, meanwhile, the noise generated by the interference effect of the leakage vortex and other blades is also reduced, the high noise problem caused by high pressure pulsation is avoided, meanwhile, the fan efficiency is improved due to reduction of the leakage flow, the damage to the structure of the fan blade due to the high load caused by the leakage vortex is further avoided, and the use stability and the service life of the fan blade are improved.
Further, as shown in fig. 1, the blade includes a connecting end 114 and a free end 116, the connecting end 114 being connected with the hub 102; the inflection point of the included angle beta which is increased and then reduced is positioned in the interval of 60 to 90 percent of the blade height of the blade; wherein the blade height is the distance from the connecting end 114 to the free end 116 in the radial direction of the hub 102.
In this embodiment, the inflection point at which the included angle β is increased and then decreased is set within the interval of 60% to 90% of the blade height of the blade 104, so that the load of 60% to 90% of the upper half is higher, and the scoop-shaped trailing edge structure is formed, which can reduce the operating speed of the fan when the fan reaches the same air volume and air pressure level, and thus the rim speed of the fan is reduced, which brings a direct effect of reducing the noise of the fan.
Further, as shown in fig. 1, as the radius R decreases, the chord length of the blade 104 corresponding to the radius R decreases and then increases from the free end 116 to the connection end 114.
In this embodiment, the chord length of the blade 104 is set to decrease and then increase along with the decrease of the radius R from the free end 116 to the connecting end 114, so as to further reduce the tip load and the flow rate of the latent flow from the pressure surface 124 to the suction surface 122, suppress the strength of the tip leakage vortex 120, reduce the fan noise, improve the fan efficiency, and improve the stability and the service life of the fan blade. Moreover, the design with a shorter intermediate chord length allows each blade 104 to be more lightweight, thereby reducing the weight of the entire fan.
Further, the blade 104 further includes: a midship section 118, the midship section being located between the connection end 114 and the free end 116; the chord length corresponding to the free end 116 is larger than the chord length corresponding to the midship section 118 and the connecting end 114.
In this embodiment, by setting the chord length of the free end 116 to be greater than the chord length of the midship 118 and the connecting end 114, the wind power provided by the fan can be further increased, the applicable range of the fan can be wider, the versatility of the fan can be improved, the blade tip load and the flow rate of the latent flow from the pressure surface 124 to the suction surface 122 can be reduced, the strength of the tip leakage vortex 120 can be suppressed, the fan noise can be reduced, and the use stability and the service life of the fan blade can be improved.
In any of the above embodiments, as shown in fig. 1, further, the contour of the blade leading edge 106 gradually extends forward in the rotation direction of the hub 102 from the connecting end 114 to the free end 116.
In this embodiment, the contour of the leading edge 106 of the blade is gradually extended toward the rotation direction of the hub 102 from the connecting end 114 to the free end 116, i.e., a forward-curved structure is formed, so that the blade can adapt to the complicated leading edge airflow of the blade, and the interference with other blades is reduced, thereby further reducing the fan noise.
Further, as shown in fig. 6, as the radius R increases, the included angle formed by the first connection line a and the second connection line b increases after increasing and then decreases. The contour line of the blade trailing edge 108 is set to be a multi-bending structure, and at least two inflection points are formed on the included angle between the connecting end 114 and the free end 116 of the blade 104, so that the curve setting is adopted to reduce the blade top load and the flow of the undercurrent from the pressure surface to the suction surface, the strength of the blade top leakage vortex is restrained, the noise is reduced, and meanwhile, the fan efficiency is improved due to the reduction of the leakage flow.
Example four
According to a third aspect of the present invention, as shown in fig. 7, 8, 9, 10, there is also provided a fan 200, comprising: a first stage fan blade 202, the first stage fan blade 202 comprising the fan blade 100 and a second stage fan blade 204 as described above in any of the embodiments; the driving assembly is connected with the first-stage fan blades 202 and the second-stage fan blades 204, wherein the rotating directions of the first-stage fan blades 202 and the second-stage fan blades 204 are opposite, the first-stage fan blades 202 are upstream fan blades, and the second-stage fan blades 204 are downstream fan blades; along the rotating direction of the first-stage fan blades, the front edges of the blades of the first-stage fan blades are positioned in front of the tail edges of the blades.
In this embodiment, the driving assembly is connected to the first stage fan blade 202 and the second stage fan blade 204, and the rotation directions of the first stage fan blade 202 and the second stage fan blade 204 are opposite, so that the counter-rotation of the second stage fan is realized, and a higher wind pressure can be provided, specifically, the rotation directions of the first stage fan blade 202 and the second stage fan blade 204 are respectively shown by arrows in fig. 1 and fig. 8. Further, in the incoming flow direction of the airflow, the first stage fan blade 202 located at the front is an upstream fan blade, and the second stage fan blade 204 located at the rear is a downstream fan blade. Wherein, the first-stage fan blade 202 includes the fan blade 100 of any of the above embodiments, along the rotation direction of the first-stage fan blade, the blade leading edge of the blade of the first-stage fan blade is located in front of the blade trailing edge, thereby realizing reduction of the blade top load and the flow rate of the undercurrent from the pressure surface to the suction surface, suppressing the strength of the blade top leakage vortex, reducing the noise generated by the interference between the blade top leakage vortex and the second-stage fan blade 204, avoiding the problem of high noise caused by high pressure pulsation, reducing the leakage flow rate, reducing the mechanical energy lost by the two stages of fan blades, improving the efficiency of the fan, further avoiding the damage to the structure of the fan blade due to the high load caused by the leakage vortex, and improving the service stability and the service life of the fan.
Further, as shown in fig. 8 and 9, the second stage fan blade 204 includes the fan blade 100 according to any of the above embodiments; and the front edge of the blade of the fan blade of the second-stage fan blade is positioned in front of the tail edge of the blade along the rotation direction of the second-stage fan blade.
In this embodiment, since the second-stage fan blade 204 includes the fan blade 100 of any of the above embodiments, all the advantages of the fan blade are provided, and are not described herein again.
Further, as shown in fig. 7, the driving assembly in one embodiment includes: a motor 206; the first output shaft 208, the first output shaft 208 is connected with the motor 206, the output end of the first output shaft 208 is connected with the first stage fan blades 202, and the first output shaft 208 is provided with an axial through hole; the second output shaft 210 penetrates through the through hole, one end of the second output shaft 210 is connected with the motor 206, and the other end of the second output shaft 210 is connected with the second-stage fan blades 204; wherein the first output shaft 208 and the second output shaft 210 rotate in opposite directions.
In this implementation, the driving assembly includes a motor 206, a first output shaft 208, and a second output shaft 210, specifically, one end of the first output shaft 208 is connected to the motor 206, and the output end is connected to the first stage fan blades 202, so that the power of the motor 206 is transmitted to the first stage fan blades 202, the second output shaft 210 is inserted into the axial through hole of the first output shaft 208 in a nested connection manner, one end of the second output shaft 210 is connected to the motor 206, and the output end is connected to the second stage fan blades 204, so that the power of the motor 206 is transmitted to the second stage fan blades 204 and is rotated in the direction opposite to the rotation direction of the first stage fan blades 202, so that the second stage fan blades form a disrotatory structure, and a higher wind pressure is provided.
Further, in yet another embodiment, a drive assembly includes: a first motor; the first output shaft is connected with the first motor, and the output end of the first output shaft is connected with the first-stage fan blades; a second motor; the output end of the second output shaft is connected with the second-stage fan blades; wherein, the rotation directions of the first output shaft and the second output shaft are opposite. Specifically, the one end of first output shaft links to each other with first motor, the output links to each other with first order flabellum, the power transmission who makes first motor makes its rotation for first order flabellum, the one end of second output shaft links to each other with the second motor, the output links to each other with the second order flabellum, and make it rotate towards the direction opposite with first order flabellum direction of rotation, make the second order flabellum form the disrotatory, provide higher wind pressure, and the mode modularization that controls a flabellum respectively through two motors is strong, realize more easily.
Further, in this embodiment, the outdoor unit of an air conditioner further includes a first motor bracket, and the first motor of the fan is disposed on the first motor bracket; and the second motor of the fan is arranged on the second motor support. The first motor of the fan is arranged on the first motor support, and the second motor of the fan is arranged on the second motor support, so that the two motors of the fan are fixedly arranged on the air conditioner outdoor unit, relative movement cannot occur, and the fan and the air conditioner outdoor unit are assembled.
Further, as shown in fig. 10, when the fan is projected along the rotation axis direction of the first-stage blades, the intersection angle between the contour line 108 of the trailing edge of the blade of the first-stage blade 202 and the contour line of the leading edge 106 of the blade of the second-stage blade 204 in the projection plane is greater than 20 °.
In this embodiment, the fan is projected along the direction of the rotation axis of the first-stage fan blade, and in the projection plane, by arranging the intersection angle between the contour line of the trailing edge of the blade corresponding to the first-stage fan blade 202 and the contour line of the leading edge 106 of the blade corresponding to the second-stage fan blade 204 to be greater than 20 °, the flow phase interference between the trailing edge 108 of the blade of the first-stage fan blade 202 and the leading edge 106 of the blade of the second-stage fan blade 204 can be reduced, so as to reduce interference noise. Specifically, the intersection angle refers to an angle formed between a tangent line of the blade trailing edge contour line 108 corresponding to the first-stage blade 202 and a tangent line of the blade leading edge contour line 106 corresponding to the second-stage blade 204 in the intersection state.
EXAMPLE five
According to a fourth aspect of the present invention, as shown in fig. 11, there is also provided an outdoor unit 300 of an air conditioner, comprising: a housing 302 provided with an air outlet 304; the air guide ring 306 is arranged at the air outlet 304; and as for the fan 200 according to any of the above technical solutions, the fan 200 is disposed on the casing 302 and located in the wind guide ring 306.
In this embodiment, the fan 200 according to any of the above technical solutions is included, so that all the beneficial effects of the fan 200 are achieved, and details are not described herein.
Further, the outdoor unit of the air conditioner further includes third stage fan blades (not shown in the figure), and the third stage fan blades are disposed on the wind-guiding ring 306 and distributed along the inner circumference of the wind-guiding ring 306.
In this embodiment, the third stage fan blades are arranged in the outdoor unit 300, so that the fan pressure can be further increased, the applicable range of the outdoor unit is wider, and the universality of the outdoor unit is improved.
Further, third stage blades (not shown) are located between first stage blades 202 and second stage blades 204; and/or the third stage fan blades are positioned between the first stage fan blades 202 and the inlet end of the air outlet 304; the third stage fan is located between the second stage fan 204 and the outlet end of the outlet 304.
In this embodiment, the third stage fan blade may be disposed at various positions in the fan 200 to further increase the fan pressure, and the first stage fan blade 202 and the second stage fan blade 204 include the fan blade 100 of any of the above embodiments, so that all the advantages of the fan blade are achieved, and the description thereof is omitted.
Further, the third stage fan blade may be a stationary blade, or a dynamic blade having the fan blade of any of the above embodiments.
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
In this embodiment, a fan structure is provided, as shown in fig. 7 to 10, the fan structure is specifically a counter-rotating fan structure, and includes: the motor 206, the first-stage fan blades 202, the second-stage fan blades 204 and the motor 206 extend out of two main shafts which are nested inside and outside and are respectively a first output shaft 208 and a second output shaft 210, the design rotating directions of the two shafts driving the fan to rotate are opposite, the two stages of fan blades transmit torque through matching of the main shafts and inner holes of the fan blades, and the axial position is locked through a locking nut in the axial direction.
Fig. 1 shows a structure diagram of a first stage fan blade 202 of a fan 200, which mainly includes: the blades 104 and hub 102 are arranged in a plurality of circumferential directions about a central axis. The blade 104 is divided into a blade leading edge (i.e., a blade leading edge 106) and a blade trailing edge (i.e., a blade trailing edge 108) according to the airflow direction, and is divided into a blade root region (i.e., a connecting end 114), a blade middle section 118 and a blade tip region (i.e., a free end 116) according to the blade trailing edge along the blade height increasing direction, and an included angle β defined by a first connecting line between the intersection point of the blade trailing edge and the hub 102 and the axis and a second connecting line between the intersection point of a circle with a radius R and a trailing edge contour line and the axis of the hub 102 by taking the axis of the hub 102 as the center of a circle is defined.
As shown in fig. 1 to 4, the blade 104 has the following structural features, first, as shown in fig. 1, a projection view of the blade along the rotation axis direction of the hub 102 is shown, and the front edge of the blade 104 extends forward along the rotation direction of the hub to form a forward-curved structure to adapt to the complicated front edge airflow.
Secondly, the trailing edge wrap angle β formed by the blade trailing edge profile configuration has the characteristics shown in fig. 3, and the relationship between the trailing edge wrap angle β and the ratio of the radius R to the blade tip-to-axis distance R2 is shown schematically. As shown, the trailing edge wrap angle β is smaller at small radii, increasing gradually as the radius R increases, with inflection points occurring in the approximately 60% to 90% span near the upper half, and a decrease in the trailing edge line wrap angle β as the diameter increases further. This design configuration results in a spoon-type configuration of the trailing edge contour as shown in fig. 1.
Finally, the camber line of the blade 104 as taken by concentric circles of different radii corresponds to a chord length of the blade that decreases rapidly from the free end 116 as the radius R decreases. And subsequently increases in chord length of the blade 104 again as the radius R decreases. The chord length of the blade refers to the chord length corresponding to the arc shape of the blade corresponding to the section of the circle, wherein the circle with the center of the hub as the center and the radius as R is used for carrying out axial section on the blade.
This design is primarily considered in view of the fact that the pressure surface 124 and the suction surface 122 have high and low pressure characteristics, respectively, as the airflow passes over the first stage fan blades 202. A latent flow is created at the top of the blade from the pressure side 124 to the suction side 122. And forms tip leakage vortices 120 from the leading edge of the blade, as shown in fig. 4. When the wind guide ring is provided, the blade tip leakage vortex 120 is separated from the blade due to the scraping action of the wind guide ring, the blade tip leakage vortex 120 of the first-stage fan blade 202 develops downstream and interferes with the front edge of the second-stage fan blade 204, and strong aerodynamic noise is generated. In order to reduce the strong aerodynamic noise caused by the tip leakage vortex 120, the design of the blade structure shown in fig. 1, in which the leading edge has a longer chord length, is larger than the design of the other chord lengths of the middle and upper portions with different radii, and the trailing edge wrap angle β is the special design shown in fig. 3, so that the tip load can be significantly reduced, the flow rate of the latent flow from the pressure surface 124 to the suction surface 122 can be reduced, and the strength of the tip leakage vortex 120 can be suppressed. This brings about an effect of suppressing the interference between the leakage vortex strength of the first stage blades 202 and the blade leading edge 106 of the second stage blades 204, and further brings about a low noise characteristic of the pair of rotary fans. And a reduction in leakage flow also results in an increase in fan efficiency.
Fig. 8 and 9 show a structure diagram of the second stage fan blade 204, and like the first stage fan blade 202, the front edge of the second stage fan blade 204 extends forward along the rotation direction when viewed from the axial direction, and this design is mainly considered to match the first stage fan blade 202. The first stage blades 202 and the second stage blades 204 rotate in opposite directions, and the trailing edge of the first stage blades 202 generally extends forward in the direction of rotation. Therefore, as large as possible the crossing angle between the trailing edge of the first stage blade 202 and the leading edge of the second stage blade 204 as shown in FIG. 10 is designed, typically greater than 20. This design also reduces the interference of the flow phase between the trailing edge of the first stage fan blade 202 and the leading edge of the second stage fan blade 204, and reduces the interference noise. The trailing edge of the second stage blade 204, like the trailing edge of the first stage blade 202, also has the same trailing edge wrap angle feature as in FIG. 3. The trailing edge wrap angle β is smaller at small radii, with increasing radii, with inflection points occurring in the approximately 60% to 90% span of the blade height near the upper half, and a decrease in the trailing edge wrap angle β as the diameter increases further. This design configuration creates a downstream fan blade trailing edge line also appearing as a scoop type structure as shown in FIG. 8. And the chord length of the second stage fan blade 204 decreases rapidly from the free end 116 as the radius decreases and increases again as the radius decreases. This configuration also reduces tip leakage vortex 120 strength of second stage fan blades 204, reduces aerodynamic noise generated by two-stage flow interference of fan 200, and improves efficiency.
Further, the counter-rotating fan is not limited to two-stage counter-rotation, and may also be provided with three or more stages of counter-rotation, and each stage of fan blade may include the fan blade 100 of the above embodiment.
The low-noise blade structure design scheme of the counter-rotating fan provided by the invention can bring the following main beneficial effects:
firstly, the technical scheme of the invention adopts the characteristic design that the trailing edge wrap angle beta has the characteristic design as shown in fig. 3, an inflection point appears in the blade height interval of about 60-90% close to the upper half part, and the trailing edge line is constructed to form a spoon-type structure, so that the design brings the greatest benefit that the load of the blade is concentrated on about 60-90% of the blade height of the upper half part, the lower load is adopted in the blade height profile of more than 90%, and the length of the chord length of the blade top area is longer. The longer chord length of the blade top area can reduce the load on two sides of the blade in the blade top area and reduce the blade top leakage potential flow intensity generated by the pressure difference effect from the pressure surface to the suction surface. The method is not only beneficial to reducing the noise generated by the single-stage blade tip leakage vortex 120, but also can reduce the interference between the flow developed by the leakage vortex and the flow of the second-stage fan blade 204, thereby bringing about the reduction of two-stage interference aerodynamic noise. Meanwhile, the reduction of the tip leakage vortex 120 also brings about two-stage rotor loss reduction, the efficiency of the fan is improved, and the power consumption is reduced.
Specifically, as shown in fig. 12, a comparison graph of test data of noise generated by the fan provided by the present application and noise generated by the fan in the prior art is obtained through experiments, where an abscissa is a ratio of an actual flow rate to a set flow rate measured corresponding to different rotation speeds, and an ordinate is a corresponding measured noise value, and it can be clearly seen that the noise generated by the present application is significantly lower than the noise of the fan in the prior art under the condition of the same rotation speed.
The structure formed by the technical scheme of the invention has higher load of about 60-90% at the upper half part, and a spoon-shaped tail edge structure is formed, so that the running rotating speed of the fan can be reduced when the same air quantity and air pressure level is reached, the rim speed of the fan is reduced, and the direct action effect is that the noise of the fan is reduced.
The leading edge of the last two stages of blade designs extends forward along the direction of rotation when viewed axially, forming a forward curved structure to accommodate complex leading edge airflow, reducing interference caused by the trailing edge of the first stage blade 202, which is beneficial to improving two-stage matching and obtaining a lower noise fan 200.
Furthermore, the counter-rotating fan provided by the invention can not only be applied to an external unit of a central air conditioner, but also be applied to other scenes such as an external unit of a household air conditioner, an internal unit of a household air conditioner and the like which generate air transportation.
In the description of the present invention, the terms "plurality" or "a plurality" refer to two or more, and unless otherwise specifically defined, the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships illustrated in the drawings, and are only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention; the terms "connected," "mounted," "secured," and the like are to be construed broadly and include, for example, fixed connections, removable connections, or integral connections; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the description of the present invention, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In the present invention, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (17)

1. A fan blade, comprising:
a hub;
the blades are arranged on the hub, and along the rotation direction of the hub, the blades comprise blade front edges and blade tail edges which are respectively positioned at two sides of the blades;
wherein, follow wheel hub's radial direction, the contour line of blade trailing edge includes first bight and second bight, first bight is to keeping away from one side of blade leading edge is protruding, the second bight orientation one side of blade leading edge is protruding.
2. The fan blade of claim 1, wherein said blade comprises:
a free end;
the connecting end is connected with the hub;
a midship section located between the connection end and the free end;
wherein a chord length of the free end position of the blade is greater than a chord length of the midship section and the connection end position.
3. The fan blade of claim 2,
the contour line of the leading edge of the blade extends towards the front of the rotation direction of the hub from the connecting end to the free end.
4. The fan blade according to claim 2 or 3,
the edge the link extremely the direction of free end, the contour line of blade trailing edge still includes the third bight, the third bight with the second bight is connected, the third bight is to keeping away from one side of blade leading edge is protruding.
5. A fan blade is characterized in that a fan blade is provided,
a hub;
the blades are arranged on the hub, and along the rotation direction of the hub, the blades comprise blade front edges and blade tail edges which are respectively positioned at two sides of the blades;
along a first connecting line between the intersection point of the blade tail edge and the hub and the axis of the hub, taking the axis of the hub as a circle center, and a second connecting line between the intersection point of a circle with a radius of R and the blade tail edge and the axis of the hub, wherein an included angle formed by the first connecting line and the second connecting line is increased and then decreased along with the increase of the radius of R;
the radius R is larger than the radius of the hub and smaller than the distance from the free end of the blade to the axis.
6. The fan blade of claim 5,
the blade comprises a connecting end and a free end, and the connecting end is connected with the hub;
the inflection point of which the included angle is increased and then reduced is positioned in the interval of 60 to 90 percent of the blade height of the blade;
wherein the blade height is along the radial direction of the hub, and the distance between the connecting end and the free end is smaller than the blade height.
7. The fan blade of claim 6,
and along the direction from the free end to the connecting end, along with the reduction of the radius R, the chord length of the blade at the position of the radius R is firstly reduced and then increased.
8. The fan blade of claim 6, further comprising:
a midship section located between the connection end and the free end;
wherein a chord length of the free end position of the blade is greater than a chord length of the midship section and the connection end position.
9. The fan blade according to any of the claims 6 to 8,
the contour line of the leading edge of the blade extends towards the front of the rotation direction of the hub from the connecting end to the free end.
10. The fan blade according to any of the claims 5 to 8,
with the increase of the radius R, the included angle formed by the first connecting line and the second connecting line is increased and then decreased, and then is increased.
11. A fan, comprising:
a first stage fan blade comprising the fan blade of any of claims 1 to 4 or the fan blade of any of claims 5 to 10;
a second stage fan blade;
the driving assembly is connected with the first-stage fan blades and the second-stage fan blades;
the first-stage fan blades and the second-stage fan blades rotate in opposite directions, the first-stage fan blades are upstream fan blades, and the second-stage fan blades are downstream fan blades;
along the rotation direction of the first-stage fan blades, the blade front edges of the blades of the first-stage fan blades are positioned in front of the blade tail edges.
12. The fan as recited in claim 11,
the second stage fan blade comprises the fan blade of any one of claims 1 to 4 or the fan blade of any one of claims 5 to 10;
the blade front edge of the blade of the second-stage fan blade is positioned in front of the blade tail edge along the rotation direction of the second-stage fan blade.
13. The fan as recited in claim 12,
the fan is projected along the direction of the rotation axis of the first-stage fan blade, and the cross included angle between the blade trailing edge contour line corresponding to the blade of the first-stage fan blade and the blade leading edge contour line corresponding to the blade of the second-stage fan blade is larger than 20 degrees in the projection plane.
14. An outdoor unit of an air conditioner, comprising:
a housing provided with an air outlet;
the air guide ring is arranged at the air outlet; and
the blower of any one of claims 11-13, wherein the blower is disposed on the housing and within the wind-guiding ring.
15. The outdoor unit of claim 14, further comprising:
and the third-stage fan blades are arranged on the air guide ring and distributed along the circumferential side of the inner ring of the air guide ring.
16. The outdoor unit of claim 15, wherein,
the third stage fan blade is positioned between the first stage fan blade and the second stage fan blade; and/or
The third stage fan blade is positioned between the first stage fan blade and the inlet end of the air outlet; and/or
The third stage fan blade is positioned between the second stage fan blade and the outlet end of the air outlet.
17. An air conditioning system, comprising:
the blower of any one of claims 11-13; or
The outdoor unit of any one of claims 14 to 16.
CN202010483228.6A 2020-06-01 2020-06-01 Fan blade, fan, air condensing units and air conditioning system Pending CN113757168A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN202010483228.6A CN113757168A (en) 2020-06-01 2020-06-01 Fan blade, fan, air condensing units and air conditioning system
PCT/CN2020/129502 WO2021243969A1 (en) 2020-06-01 2020-11-17 Fan blade, fan, air conditioner outdoor unit and air conditioner system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010483228.6A CN113757168A (en) 2020-06-01 2020-06-01 Fan blade, fan, air condensing units and air conditioning system

Publications (1)

Publication Number Publication Date
CN113757168A true CN113757168A (en) 2021-12-07

Family

ID=78782541

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202010483228.6A Pending CN113757168A (en) 2020-06-01 2020-06-01 Fan blade, fan, air condensing units and air conditioning system

Country Status (2)

Country Link
CN (1) CN113757168A (en)
WO (1) WO2021243969A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115111194A (en) * 2022-06-27 2022-09-27 约克广州空调冷冻设备有限公司 Blade and axial flow impeller using same

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114754023A (en) * 2022-03-28 2022-07-15 约克广州空调冷冻设备有限公司 Blade, impeller and backward centrifugal fan

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1374460A (en) * 2001-03-06 2002-10-16 东芝开利株式会社 Tube-axial fan
JP2003343489A (en) * 2002-05-30 2003-12-03 Mitsubishi Electric Corp Air blower, controlling method and air cleaner
CN101012839A (en) * 2007-01-31 2007-08-08 广东美的电器股份有限公司 Axial-flow windwheel
CN102168686A (en) * 2010-02-26 2011-08-31 松下电器产业株式会社 Impeller and pressure fan and air conditioner using the same
CN106089769A (en) * 2016-07-27 2016-11-09 江苏超力电器有限公司 A kind of big flow low noise automobile air conditioning system condenser fan
CN106438471A (en) * 2016-11-15 2017-02-22 广东美的制冷设备有限公司 Axial-flow wind wheel and air conditioner
CN206221361U (en) * 2016-11-09 2017-06-06 广东美的暖通设备有限公司 Axial-flow windwheel and the air-conditioner with axial-flow windwheel
CN208059152U (en) * 2018-03-20 2018-11-06 广东美的制冷设备有限公司 Air-conditioner outdoor unit and air conditioner
CN109058161A (en) * 2018-09-27 2018-12-21 美的集团股份有限公司 Axial-flow windwheel and air-conditioner outdoor unit
CN110345106A (en) * 2019-07-31 2019-10-18 广东美的制冷设备有限公司 Axial-flow leaf, axial flow blower and air conditioner
CN111043058A (en) * 2018-10-15 2020-04-21 广东美的白色家电技术创新中心有限公司 Counter-rotating fan

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107989827B (en) * 2017-11-23 2024-02-20 广东美的制冷设备有限公司 Axial flow wind wheel and air conditioner
CN109958637A (en) * 2019-04-22 2019-07-02 广东美的制冷设备有限公司 The fan assembly of air-conditioner outdoor unit and air-conditioner outdoor unit with it

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1374460A (en) * 2001-03-06 2002-10-16 东芝开利株式会社 Tube-axial fan
JP2003343489A (en) * 2002-05-30 2003-12-03 Mitsubishi Electric Corp Air blower, controlling method and air cleaner
CN101012839A (en) * 2007-01-31 2007-08-08 广东美的电器股份有限公司 Axial-flow windwheel
CN102168686A (en) * 2010-02-26 2011-08-31 松下电器产业株式会社 Impeller and pressure fan and air conditioner using the same
CN106089769A (en) * 2016-07-27 2016-11-09 江苏超力电器有限公司 A kind of big flow low noise automobile air conditioning system condenser fan
CN206221361U (en) * 2016-11-09 2017-06-06 广东美的暖通设备有限公司 Axial-flow windwheel and the air-conditioner with axial-flow windwheel
CN106438471A (en) * 2016-11-15 2017-02-22 广东美的制冷设备有限公司 Axial-flow wind wheel and air conditioner
CN208059152U (en) * 2018-03-20 2018-11-06 广东美的制冷设备有限公司 Air-conditioner outdoor unit and air conditioner
CN109058161A (en) * 2018-09-27 2018-12-21 美的集团股份有限公司 Axial-flow windwheel and air-conditioner outdoor unit
CN111043058A (en) * 2018-10-15 2020-04-21 广东美的白色家电技术创新中心有限公司 Counter-rotating fan
CN110345106A (en) * 2019-07-31 2019-10-18 广东美的制冷设备有限公司 Axial-flow leaf, axial flow blower and air conditioner

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115111194A (en) * 2022-06-27 2022-09-27 约克广州空调冷冻设备有限公司 Blade and axial flow impeller using same

Also Published As

Publication number Publication date
WO2021243969A1 (en) 2021-12-09

Similar Documents

Publication Publication Date Title
EP0183787B1 (en) Fan and housing
US7762769B2 (en) Axial fan assembly
US5906179A (en) High efficiency, low solidity, low weight, axial flow fan
CN201560963U (en) High-efficiency axial flow fan
US20030026699A1 (en) High efficiency, inflow-adapted, axial-flow fan
JPH0522080B2 (en)
KR20000047976A (en) Axial flow fan
US7186080B2 (en) Fan inlet and housing for a centrifugal blower whose impeller has forward curved fan blades
AU2003207098A1 (en) Fan
US6206635B1 (en) Fan stator
CN113757168A (en) Fan blade, fan, air condensing units and air conditioning system
KR101913147B1 (en) Centrifugal impeller having backward blades using dual gradient sectional shape type
WO2021208496A1 (en) Mixed flow wind wheel, fan assembly, power system, and fan
JP2003148395A (en) Impeller of air-conditioning fan
CN107975494B (en) Axial flow wind wheel and air conditioner
JPS6116298A (en) Fan
KR100663965B1 (en) Axial flow fan
KR20130009792A (en) Free-tipped axial fan assembly
JP2016511358A (en) Turbine, compressor or pump impeller
JP2020186649A (en) Impeller for centrifugal compressor, centrifugal compressor and turbo charger
CN113309714A (en) Multi-wing centrifugal fan and household appliance
CN113123979B (en) Outdoor machine of air conditioner
CN112855609B (en) Fan and motor
JP4576304B2 (en) Propeller fan
KR100761153B1 (en) Axial flow fan

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