CN111255743B - Fan blade, cooling fan and microwave oven - Google Patents

Fan blade, cooling fan and microwave oven Download PDF

Info

Publication number
CN111255743B
CN111255743B CN202010135190.3A CN202010135190A CN111255743B CN 111255743 B CN111255743 B CN 111255743B CN 202010135190 A CN202010135190 A CN 202010135190A CN 111255743 B CN111255743 B CN 111255743B
Authority
CN
China
Prior art keywords
blade
fan
sweep angle
forward sweep
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.)
Active
Application number
CN202010135190.3A
Other languages
Chinese (zh)
Other versions
CN111255743A (en
Inventor
林健
赵涛
任志文
周宇
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
Guangdong Midea Kitchen Appliances Manufacturing Co Ltd
Original Assignee
Midea Group Co Ltd
Guangdong Midea Kitchen Appliances Manufacturing 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, Guangdong Midea Kitchen Appliances Manufacturing Co Ltd filed Critical Midea Group Co Ltd
Priority to CN202010135190.3A priority Critical patent/CN111255743B/en
Publication of CN111255743A publication Critical patent/CN111255743A/en
Application granted granted Critical
Publication of CN111255743B publication Critical patent/CN111255743B/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
    • 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
    • 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
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C15/00—Details
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C7/00—Stoves or ranges heated by electric energy
    • F24C7/02—Stoves or ranges heated by electric energy using microwaves

Abstract

The invention discloses a fan blade, a cooling fan and a microwave oven, wherein the fan blade comprises a hub and a plurality of blades, the hub is provided with a shaft hole, the blades are distributed at intervals along the circumferential direction of the hub, the blades adopted by the fan blade are forward swept, the forward swept can reduce the axial flow diffusion of the blade tip of the blade, the front edge bending angle of a suction surface is smaller, and the accumulation of boundary layers on the surfaces of the blades is effectively reduced, so that the distribution of the boundary layers is improved, and the interference loss of the boundary layers is reduced; and through improving the distribution of the sweepforward angle of the blade, make the spanwise distribution along blade aerodynamic load more even, the blade edge flow quality is better, can reduce the pressure difference of pressure surface and suction surface, make the apex reveal the whirlpool and improve, and limit the value range of the biggest sweepforward angle, avoid the sweepforward angle too big and influence the flabellum performance, can promote the air-out efficiency of the flabellum, can reduce the noise that the flabellum rotates and produces simultaneously, guarantee that the flabellum has stable operating performance, be applicable to the radiator fan of microwave oven, meet the requirement of high-efficient heat dissipation.

Description

Fan blade, cooling fan and microwave oven
Technical Field
The invention relates to the technical field of household appliances, in particular to a fan blade, a cooling fan and a microwave oven.
Background
At present, microwave ovens are widely used in people's lives as food heating appliances. The inside of the microwave oven mainly utilizes an axial fan component to radiate components such as a transformer, a frequency converter, a magnetron and the like. With the increasing requirements for miniaturization and portability of microwave ovens, the arrangement of high-power heating electrical components such as magnetrons, transformers or frequency converters and the like is more and more concentrated, and the requirements for heat dissipation are higher and higher.
In the rotating process of the fan blades, air flows along the surfaces of the blades, and because the surfaces of the fans are not absolutely smooth and the air has viscosity, a layer of air tightly attached to the surfaces of the blades is blocked, the flow speed is reduced to zero, and the air with the flow speed of zero affects the flow of the air in the previous layer through the viscosity action, so that the air flow speed in the upper layer is reduced; such a layer affects the layer, and a thin layer of air with a gradually increasing flow velocity in the direction of the object plane normal appears in close proximity to the blade surface, which is often referred to as a boundary layer, which is a significant source of loss of fan flow. Meanwhile, when the fan blade rotates, the front edge of the blade tip cuts air, pressure difference exists between the pressure surface and the suction surface of the blade, and under the action of the pressure difference, airflow flows from the pressure surface to the suction surface to form blade tip leakage vortex, the blade tip leakage vortex is a key factor determining flow loss and is also one of noise sources of the fan, and the boundary layer and the blade tip leakage vortex are two important factors influencing the pneumatic performance and the acoustic performance of the fan.
As shown in fig. 1 and 2, the shape of the axial fan blade for the existing microwave oven is simple, the conventional technical means is that the air volume of the fan can be increased by increasing the rotating speed of the fan, but the noise level of the fan is also correspondingly increased, the high rotating speed of the motor can aggravate the loss of the motor, the cost is increased, and meanwhile, the reliability and the safety are both reduced, and it can be seen that the existing fan cannot reduce the influence of the boundary layer and the tip leakage vortex on the performance of the blade.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides the fan blade, the cooling fan and the microwave oven, which can effectively improve the performance of the fan blade, can improve the air outlet efficiency of the fan and is beneficial to reducing noise.
According to a first aspect of the present invention, there is provided a fan blade comprising:
a hub having a shaft hole;
the blades are distributed at intervals along the circumferential direction of the hub, the blades are forward swept, forward sweep angles are gradually increased along the radial direction and are distributed linearly, and the maximum forward sweep angle of the blades ranges from 10 degrees to 25 degrees.
The blades adopted by the fan blades are all forward swept, namely the blades are forward swept blades which are bent along the axial direction of the hub in the direction of the incoming wind, and the forward swept angles of the blades are gradually increased along the radial direction and are linearly distributed, so that the forward swept blades can reduce the axial flow diffusion of the blade tips of the blades, and are beneficial to reducing the leading edge bending angle of the suction surface and reducing the accumulation of boundary layers on the surfaces of the blades, thereby improving the distribution of the boundary layers and reducing the interference loss of the boundary layers; and through improving the distribution of the sweepforward angle of the blade and limiting the value of the maximum sweepforward angle within the range of 10-25 degrees, the pressure difference between the pressure surface and the suction surface can be reduced, the effect of improving the tip leakage vortex is achieved, the influence on the performance of the blade due to the overlarge sweepforward angle is avoided, the air outlet efficiency of the blade can be improved, meanwhile, the noise generated by the rotation of the blade can be reduced, the stable operation performance of the blade is ensured, the microwave oven heat dissipation fan is suitable for the microwave oven heat dissipation fan, and the requirement of efficient heat dissipation is met.
According to some embodiments of the invention, the blade has a radial cross section centered on the hub at a relative position of (x-R)/(R-R), and the maximum forward sweep angle position is at (x-R)/(R-R) ═ 1, where R is the hub radius, R is the blade outer diameter, and x is the radial height of the blade cross section.
According to a second aspect of the present invention, there is provided a fan blade comprising:
a hub having a shaft hole;
the blades are distributed at intervals along the circumferential direction of the hub, the blades sequentially comprise a first blade section and a second blade section along the radial direction, the first blade section and the second blade section are swept forward, the forward sweep angle of the first blade section is gradually increased along the radial direction and is in nonlinear distribution, the forward sweep angle of the second blade section is gradually decreased along the radial direction and is in nonlinear distribution, and the maximum forward sweep angle of the blades ranges from 10 degrees to 25 degrees.
The blades adopted by the fan blades are forward swept, namely the blades are forward swept blades which are bent along the axial direction of the hub in the direction of the incoming wind, the forward swept angle of the first blade body section is gradually increased along the radial direction and is in nonlinear distribution, and the forward swept angle of the second blade body section is gradually decreased along the radial direction and is in nonlinear distribution, so that the forward swept blades can effectively reduce the axial flow diffusion of the blade tip of the blade, the front edge bending angle of the suction surface is smaller, the accumulation of boundary layers on the surface of the blade is effectively reduced, the distribution of the boundary layers is improved, and the interference loss of the boundary layers is reduced; and through improving the distribution of the sweepforward angle of the blade, make the spanwise distribution along blade aerodynamic load more even, the blade edge flow quality is better, can reduce the pressure difference of pressure surface and suction surface, make the apex reveal the whirlpool and improve, and limit the value of the biggest sweepforward angle in 10 to 25 within ranges, avoid the sweepforward angle too big and influence the flabellum performance, can promote the air-out efficiency of the flabellum, can reduce the noise that the flabellum rotates and produce at the same time, guarantee that the flabellum has stable operating performance, is suitable for the radiator fan of microwave oven, meet the requirement of high-efficient heat dissipation.
According to some embodiments of the invention, the minimum sweep angle of the blade ranges from 0 ° to 5 °.
According to some embodiments of the invention, the blades are located along a radial section centered on the hub at a relative position of (x-R)/(R-R), the maximum forward sweep position is (x-R)/(R-R) in the range of 0.6 to 0.9, and the minimum forward sweep position is at x-R, where R is the hub radius, R is the blade outer diameter, and x is the radial height of the blade section.
According to a third aspect of the present invention, there is provided a fan blade comprising:
a hub having a shaft hole;
the blades are distributed at intervals along the circumferential direction of the hub, the blades sequentially comprise a first blade section and a second blade section along the radial direction, the first blade section and the second blade section are swept forward, the forward sweep angle of the first blade section is gradually reduced along the radial direction and is in nonlinear distribution, the forward sweep angle of the second blade section is gradually increased along the radial direction and is in nonlinear distribution, and the maximum forward sweep angle of the blades ranges from 8 degrees to 20 degrees.
The blades adopted by the fan blades are forward swept, namely the blades are forward swept blades which are bent along the axial direction of the hub in the direction of the incoming wind, the forward swept angle of the first blade body section is gradually reduced along the radial direction and is in nonlinear distribution, the forward swept angle of the second blade body section is gradually increased along the radial direction and is in nonlinear distribution, and the forward swept blades can effectively reduce the axial flow diffusion of the blade tips of the blades, so that the front edge bending angle of the suction surface is smaller, the accumulation of boundary layers on the surfaces of the blades is effectively reduced, the distribution of the boundary layers is improved, and the interference loss of the boundary layers is reduced; and through improving the distribution of the sweepforward angle of the blade, make the spanwise distribution along blade aerodynamic load more even, the blade edge flow quality is better, can reduce the pressure difference of pressure surface and suction surface, make the apex reveal the whirlpool and improve, and limit the value of the biggest sweepforward angle in 8 to 20 within ranges, avoid the sweepforward angle too big and influence the flabellum performance, can promote the air-out efficiency of the flabellum, can reduce the noise that the flabellum rotates and produce simultaneously, guarantee that the flabellum has stable operating performance, is applicable to the radiator fan of microwave oven, satisfy the high-efficient radiating requirement.
According to some embodiments of the invention, the minimum sweep angle ranges from-5 ° to 5 °.
According to some embodiments of the invention, the blades are located along a radial section centered on the hub at a relative position of (x-R)/(R-R), the maximum forward sweep position is at x-R, and the minimum forward sweep position is at (x-R)/(R-R) in the range of 0.6 to 0.9, where R is the hub radius, R is the blade outer diameter, and x is the radial height of the blade section.
According to a fourth aspect of the present invention, there is provided a heat dissipation fan, comprising the fan blade of the first aspect, the fan blade of the second aspect, or the fan blade of the third aspect.
According to a fifth aspect of the present invention, there is provided a microwave oven including the heat dissipating fan of the fourth aspect.
One of the above technical solutions of the present invention has at least one of the following advantages or beneficial effects:
the blades adopted by the fan blades are forward swept, the forward swept can reduce axial flow diffusion of blade tips of the blades, so that the front edge bend angle of the suction surface is smaller, and the accumulation of boundary layers on the surfaces of the blades is effectively reduced, thereby improving the distribution of the boundary layers and reducing the interference loss of the boundary layers; and through improving the distribution of the sweepforward angle of the blade, make the spanwise distribution along blade aerodynamic load more even, the blade edge flow quality is better, can reduce the pressure difference of pressure surface and suction surface, make the apex reveal the whirlpool and improve, and limit the value range of the biggest sweepforward angle, avoid the sweepforward angle too big and influence the flabellum performance, can promote the air-out efficiency of the flabellum, can reduce the noise that the flabellum rotates and produces simultaneously, guarantee that the flabellum has stable operating performance, be applicable to the radiator fan of microwave oven, meet the requirement of high-efficient heat dissipation.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
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 is a schematic front view of a conventional fan blade;
FIG. 2 is a schematic side view of a conventional fan blade;
FIG. 3 is a schematic view of a blade bend angle according to an embodiment of the present invention;
FIG. 4 is a schematic view of a sweep angle of a fan blade according to an embodiment of the present invention;
FIG. 5 is a schematic side view of a fan blade according to a first embodiment of the present invention;
FIG. 6 is a schematic front view of a fan blade according to a first embodiment of the present invention;
FIG. 7 is a graph showing the distribution of the relative positions of the forward sweep angles over the height of the blade for the first embodiment of the present invention;
FIG. 8 is a graph of the distribution of the relative position of the forward sweep angle over the height of the blade for the first embodiment of the present invention;
FIG. 9 is a schematic side view of a fan blade according to a second embodiment of the present invention;
FIG. 10 is a schematic front view of a fan blade according to a second embodiment of the present invention;
FIG. 11 is a graph showing the distribution of the relative positions of the forward sweep angles over the height of the blade for the second embodiment of the present invention;
FIG. 12 is a graph of the distribution of the relative position of the forward sweep angle over the height of the blade for a second embodiment of the present invention;
FIG. 13 is a schematic side view of a fan blade according to a third embodiment of the present invention;
FIG. 14 is a schematic front view of a fan blade according to a third embodiment of the present invention;
FIG. 15 is a graph showing the distribution of the relative positions of the forward sweep angles over the height of the blade for the third embodiment of the present invention;
FIG. 16 is a graph of the distribution of the relative position of the forward sweep angle over the height of the blade for the third embodiment of the present invention;
fig. 17 is a schematic view of an assembly structure of a heat dissipation fan according to an embodiment of the present invention;
fig. 18 is a schematic view of the internal structure of a microwave oven according to an embodiment of the present invention.
Description of reference numerals:
fan blade 100, hub 110, shaft hole 111, blade 120, blade root 121, blade tip 122, center of gravity stacking line 123, cross section 124, pressure surface 125, suction surface 126;
a heat radiation fan 200, a bracket 210, a current collector 220, and a motor 230;
microwave oven 300, heating chamber 310, magnetron 320, transformer 330, back plate 340, bottom plate 350.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, if there is any description of "first", "second", "third", etc. for the purpose of distinguishing technical features, it is not to be understood as indicating or implying relative importance or implying number of indicated technical features or implying precedence of indicated technical features.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted" and "connected" are to be interpreted broadly, e.g., the connection may be a fixed connection or a movable connection, a detachable connection or a non-detachable connection, or an integral connection; may be mechanically connected, may be electrically connected or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or may be connected through one or more other elements or indirectly connected through one or more other elements or in an interactive relationship between two elements.
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the embodiments described below are some, but not all embodiments of the present invention.
As shown in fig. 1 and 2, in the conventional fan blade 100, the gravity center stacking line 123 of the blade 120 deflects along the circumferential direction of the hub 110 instead of along the axial direction of the hub 110, the sweep angle of the blade 120 is constant, the included angle of the gravity center stacking line 123 deflecting along the circumferential direction of the hub 110 is a bending angle, which is also called circumferential bending, the bending of the gravity center stacking line 123 along the rotation direction is forward bending, and the bending along the reverse rotation direction is backward bending. As shown in fig. 3, the forward bend angle is θ1The back bend angle is theta2And ω is the rotation direction of fan blade 100. The conventional fan blade 100 generally improves the air outlet performance by changing the bending angle of the blade 120, but the bending angle has a limited effect on improving the performance of the fan blade 100. In terms of aerodynamic performance, because the existing blade 120 has a large pressure gradient along the radial direction, the accumulated thickness of the boundary layer near the blade tip 122 is increased, and the flow channel of the blade 100 is blocked, so that the flow loss is increased, and thus the working capacity and the efficiency of the blade 100 are poor, and the boundary layer is an important factor for causing the flow loss. As shown in fig. 2, when the blade 120 rotates, the leading edge of the blade tip 122 cuts air, one side of the blade 120 that flaps the airflow is a pressure side 125, the opposite side is a suction side 126, a pressure difference exists between the pressure side 125 and the suction side 126, and due to the pressure difference, the airflow flows from the pressure side 125 to the suction side 126 of the blade 120 to form a tip 122 leakage vortex, which is a key factor determining flow loss and is one of noise sources of the fan. It can be seen that boundary layer and tip 122 leakage vortex are two important factors limiting the performance of existing fans.
In addition, in the conventional fan blade 100, since the small turbulent incoming flows at different radial positions of the blades 120 almost simultaneously impact the leading edges of the blades 120, an air flow resonance phenomenon is formed, which causes large pressure pulsation to be generated at the leading edges of the blades 120, thereby generating noise; on the other hand, the turbulent boundary layer on the blade surface interferes with the trailing edge of the blade 120, so that the trails at different radial positions periodically drop off at the same time, the phenomenon of air flow resonance is also generated, and noise is also generated.
Fan blade 100 according to an embodiment of the present invention is described below with reference to fig. 4 to 16.
Referring to fig. 5 and 6, in the first embodiment of the present invention, a fan blade 100 includes a hub 110 and a plurality of blades 120, a shaft hole 111 is formed in a center position of the hub 110, five blades 120 are disposed on the hub 110, the five blades 120 are connected to an outer wall of the hub 110 and are distributed at equal intervals along a circumferential direction of the hub 110, a blade root 121 is formed at a front end of each blade 120, the blade root 121 is connected to the hub 110, and a blade tip 122 is formed at a tail end of each blade 120.
Referring to fig. 4 and 5, each blade 120 is forward swept, and it can be understood that the sweep angle of the blade 120 is the angle between the gravity center stacking line 123 of the blade 120 and the axial vertical line of the hub 110, which is also called axial sweep, wherein the sweep toward the wind side is forward sweep (positive angle), the sweep toward the wind side is backward sweep (negative angle), the forward sweep angle is the sweep angle of the gravity center stacking line 123 axially offset to the wind side along the hub 110, and the backward sweep angle is the sweep angle of the gravity center stacking line 123 axially offset to the wind side along the hub 110. As shown in fig. 4, the direction of arrow u is the direction of the incoming wind, the angle between line FO and line AO is the forward sweep angle α, the angle between line BO and line AO is the backward sweep angle, R represents the radius of hub 110, and R represents the outer diameter of blade 120. The gravity center overlap line 123 is a line connecting the gravity centers of the blades 120 at different positions of the cross sections 124 in the radial direction, and when the sweep angles at the positions of the cross sections 124 are the same, the gravity center overlap line 123 is a straight line, and when the sweep angles at the positions of the cross sections 124 are different, the gravity center overlap line 123 is a curved line.
Referring to fig. 5 and 6, in the present embodiment, the blade 120 is a forward swept blade 120, and the forward sweep angle α increases linearly in the radial direction, it can be understood that the forward sweep angle α of the blade 120 increases linearly from the blade root 121 to the blade tip 122, that is, the forward sweep angle α increases in a constant speed, the forward sweep angle α at the position of the blade root 121 is minimum, the minimum forward sweep angle is 0 °, the forward sweep angle α at the position of the blade tip 122 is maximum, as shown in fig. 5, the line segment FO is a gravity center stacking line 123, the line segment AO is a vertical line perpendicular to the axis of the hub 110, and the angle between the line segment FO and the line segment AO is the forward sweep angle α, and it can be seen that the forward sweep angle α of the blade 120 increases from the blade root 121 to the blade tip 122. Compared with the existing fan blade 100, the distribution of boundary layers can be improved by changing the forward sweep angle alpha distribution of the blades 120 along the radial direction of different cross sections 124, so that the span direction of each cross section 124 can be matched with the radial transportation of airflow along the boundary layers, the axial flow diffusion of the blade tips 122 of the blades 120 is effectively reduced, the reduction of the front edge bending angle of the suction surface 126 and the accumulation of the boundary layers on the surfaces of the blades 120 are facilitated, the interference loss of the boundary layers is reduced, meanwhile, the generation of larger pressure pulsation on the front edges of the blades 120 is reduced, and the noise can be effectively reduced.
In addition, the forward swept blades 120 can effectively improve the air outlet efficiency of the fan and have a noise effect, but when the forward swept angle α exceeds a certain value, the fan performance is obviously reduced. Therefore, in the present embodiment, the maximum forward sweep angle of the blade 120 ranges from 10 ° to 25 °, the maximum forward sweep angle of the blade 120 may be 10 °, 25 ° or any angle between 10 ° and 25 °, for example, the diameter of the hub 110 is 32.4mm, the outer diameter of the blade 120 is 105mm, the forward sweep angle α of the blade 120 increases linearly from the blade root 121 to the blade tip 122, the forward sweep angle α at the position of the blade root 121 is minimum and the minimum forward sweep angle is 0 °, and the forward sweep angle α at the position of the blade tip 122 is maximum and the maximum forward sweep angle is 20 °. Therefore, the pressure difference between the pressure surface 125 and the suction surface 126 can be reduced, the effect of improving vortex leakage of the blade tip 122 is achieved, the influence on the performance of the fan blade 100 caused by the overlarge forward sweep angle alpha is avoided, the air outlet efficiency of the fan blade 100 can be improved, meanwhile, the noise generated by rotation of the fan blade 100 can be reduced, and the fan blade 100 is ensured to have good pneumatic performance and acoustic performance.
In some embodiments, the position distribution of the sweep angle α is represented by the position of the blade 120 along the radial direction at different cross sections 124 with the hub 110 as the center, and it can be understood that the height of the blade 120 is the difference between the outer diameter R of the blade 120 and the radius R of the hub 110, which can be represented as R-R; the relative height of the cross-section 124 over the blade 120 is the difference between the radial height x of the cross-section 124 of the blade 120 and the radius R of the hub 110, which can be expressed as x-R, and then the relative position of the blade 120 along the radial cross-section 124 with the hub 110 as the center is (x-R)/(R-R), which can also be understood as the relative position of the cross-section 124 along the radial direction over the height of the blade 120. Since the sweep angle α of the blade 120 increases linearly from the blade root 121 to the blade tip 122, that is, the sweep angle α at the position of the blade root 121 is the smallest, and the position x of the blade root 121 is R, the relative position at the height of the blade 120 is (x-R)/(R-R) 0, the sweep angle α at the position of the blade tip 122 is the largest, and the relative position at the height of the maximum sweep angle blade 120 is (x-R)/(R-R) 1. Therefore, (x-R)/(R-R) is used for representing the position distribution of the forward sweep angle alpha, so that the forward sweep angle alpha can be uniformly distributed, the air outlet efficiency of the fan blade 100 is effectively improved, the noise is reduced, and the operating performance of the fan is improved.
Describing by way of specific example, in the first embodiment, as shown in fig. 7, the relative position relationship between the different forward sweep angles α and the corresponding sections 124 thereof is shown, and as shown in fig. 8, the relative position relationship between the different forward sweep angles α and the corresponding sections 124 thereof is shown in a coordinate form, as can be seen from fig. 7 and 8, the forward sweep angle α of the blade 120 increases linearly in the radial direction, and the forward sweep angle α increases by 2 ° every time the sections 124 increase by 0.1 in the radial direction, and the maximum forward sweep angle is 20 °, and corresponds to (x-R)/(R-R): 1, so that the distribution of the forward sweep angles α can be understood more intuitively.
Referring to fig. 9 and 10, in a second embodiment of the present invention, a fan blade 100 includes a hub 110 and a plurality of blades 120, a shaft hole 111 is formed in a central position of the hub 110, five blades 120 are disposed on the hub 110, the five blades 120 are connected to an outer wall of the hub 110 and are equally spaced along a circumferential direction of the hub 110, the blades 120 are forward swept, each blade 120 includes a first blade section and a second blade section along a radial direction, a forward sweep angle α of the first blade section gradually increases along the radial direction to form a non-linear distribution, a forward sweep angle α of the second blade section gradually decreases along the radial direction to form a non-linear distribution, the first blade section and the second blade section are understood as two blade sections with different forward sweep angles α of the blades 120, it is also understood that the first blade section is a front section of the blade 120, the second blade section is a rear section of the blade 120, the forward sweep angle α of the blade 120 increases non-linearly from a blade root 121 to a blade tip 122 and then decreases non-linearly, the forward sweep angle alpha is greatest at the transition between the first blade section and the second blade section.
As shown in fig. 9 and 10, the barycentric stack line 123 of the blade 120 is not only curved in the direction of the incoming wind, but also curved in the direction of rotation of the blade 120, that is, the barycentric stack line 123 has both a forward sweep angle α and a forward bend angle, where the line FO is the barycentric stack line 123, the line AO is a vertical line perpendicular TO the axis of the hub 110, the line TO is the barycentric stack line 123 of the first blade section, the line FT is the barycentric stack line 123 of the second blade section, the angle between the line FO and the line AO is the forward sweep angle α, the drawing does not show the forward bend angle, the line TO and the forward sweep angle α of the line AO increase nonlinearly, the line FT and the forward sweep angle α of the line AO decrease nonlinearly, the forward angle α between the line FT and the line TO is the maximum, and the forward bend angle of the line FT is greater than the forward bend angle of the line TO.
Therefore, the distribution of the forward sweep angle alpha of the first blade body section is increased in a nonlinear manner, and the forward sweep angle alpha is decreased in a nonlinear manner after being increased in a nonlinear manner, so that the distribution of the boundary layer can be improved, the span direction of the section 124 of the blade 120 can be matched with the radial transportation of airflow along the boundary layer, the axial flow diffusion of the blade tip 122 of the blade 120 is effectively reduced, the front edge bend angle of the suction surface 126 is smaller, the accumulation of the boundary layer on the surface of the blade 120 is effectively reduced, and the interference loss of the boundary layer is greatly reduced; meanwhile, the performance of the fan blade 100 is prevented from being influenced by an overlarge forward sweep angle alpha, the distribution of the aerodynamic load along the spanwise direction of the blade 120 is more uniform, and the increase of the flow loss caused by the increase of the accumulated thickness of the boundary layer near the blade tip 122 is avoided, so that the edge flow quality of the blade 120 is better, the pressure gradient of each radial section 124 of the blade 120 is reduced, and the pressure gradient is a power source for the leakage vortex of the blade tip 122, so that the leakage vortex of the blade tip 122 is improved by reducing the pressure gradient of each section 124, and the aerodynamic performance of the fan blade 100 is effectively improved. In addition, due to the cooperation of forward sweep and forward bend, the impact of airflow on the front edge is reduced, the airflow resonance phenomenon is reduced, the noise reduction effect is achieved, and the acoustic performance is improved.
In this embodiment, the maximum forward sweep angle of the blade 120 is in a range of 10 ° to 25 °, the maximum forward sweep angle of the blade 120 may be 10 ° or 25 ° or any angle between 10 ° and 25 °, and the forward sweep angle α at the transition position between the first blade section and the second blade section is the maximum. For example, the diameter of the hub 110 is 32.4mm, the outer diameter of the blade 120 is 105mm, the forward sweep angle α of the blade 120 increases nonlinearly from the blade root 121 to the blade tip 122 and then decreases nonlinearly, the forward sweep angle α of the first blade section increases exponentially, the forward sweep angle α of the second blade section decreases exponentially, the maximum forward sweep angle is 20 °, the maximum forward sweep angle is located at the transition position between the first blade section and the second blade section, specifically, at a position close to the blade tip 122, that is, the forward sweep angle α of the blade 120 increases nonlinearly to 20 ° and then decreases nonlinearly, it can be understood that the maximum forward sweep angle is close to the blade tip 122, the decreasing amplitude is not too large, thus, the forward sweep angle α is maintained within a certain range, the full pressure and the efficiency of the rotation of the blade 100 are improved, the forward sweep angle α is prevented from being too large to affect the performance of the blade 100, and the static pressure distribution of the surface of the blade 120 increases the load distribution of the upper half blade height, the work capacity of the blade 120 is enhanced; the distribution of the forward sweep angle α may reduce the turbulent energy of the blade tip 122, reducing clearance flow losses.
The minimum forward sweep angle of the blade 120 ranges from 0 ° to 5 °, the minimum forward sweep angle is located at the position of the blade root 121, the minimum forward sweep angle may be 0 °, 5 °, or any angle between 0 ° and 5 °, the maximum forward sweep angle is taken as an example, when the minimum forward sweep angle is 0 °, the forward sweep angle α of the blade 120 increases nonlinearly from 0 ° to 10 °, then decreases nonlinearly from 10 °, and the forward sweep angle α decreasing to the position of the blade tip 122 is about 9 °. For another example, when the maximum forward sweep angle is 20 ° and the minimum forward sweep angle is 5 °, the forward sweep angle α of the blade 120 increases nonlinearly from 5 ° to 20 ° and then decreases nonlinearly from 20 °. It can be understood that, under the condition that the forward sweep angle α is increased in speed and the maximum forward sweep angle is the same, the larger the minimum forward sweep angle is, the faster the forward sweep angle α is increased to reach the maximum forward sweep angle, and the distribution of the cross section 124 is also changed, so that the forward sweep angle α is increased and decreased within a certain range, which is beneficial to improving the efficiency of the fan blade 100 and reducing noise.
In some embodiments, where blades 120 are centered on hub 110 along radial section 124 at a relative position of (x-R)/(R-R), where x-R represents the relative height of section 124 over blades 120 and R-R represents the height of blades 120, then (x-R)/(R-R) may also be understood as the relative position of section 124 along the radial direction over the height of blades 120. Wherein the minimum forward sweep angle position is (x-R)/(R-R) ═ 0, and the maximum forward sweep angle position is (x-R)/(R-R) within the range of 0.6 to 0.9, it can be understood that the relative position of the cross section 124 on the height of the blade 120 is used to represent the position of the forward sweep angle α, and the distribution of the forward sweep angle α and the cross section 124 can be reasonably arranged, and it can be known that the (x-R)/(R-R) ═ 0.5 position is the middle position of the height of the blade 120, the maximum forward sweep angle is located in the latter half of the blade 120, and for the large pressure difference between the pressure surface 125 and the suction surface 126 at the leading edge position of the blade tip 122 during the rotation of the fan blade 100, the maximum forward sweep angle is located in the latter half of the blade 120, and the non-linear increase of the forward sweep angle α to the maximum value is reduced, so that the forward sweep angle α is maintained within a certain range, therefore, the distribution of the aerodynamic load along the spanwise direction of the blade 120 is more uniform, the increase of the flow loss caused by the increase of the accumulated thickness of the boundary layer near the blade tip 122 is avoided, the flow quality of the front edge of the blade tip 122 is better, the pressure gradient of the blade 120 along each radial section 124 is reduced, and the pressure gradient is the power source of the tip 122 leakage vortex, so that the tip 122 leakage vortex is improved by reducing the pressure gradient of each section 124, and the aerodynamic performance and the acoustic performance of the fan blade 100 are effectively improved.
Describing by way of specific example, in the second embodiment, as shown in fig. 11, the relative position relationship between the different forward sweep angles α and the corresponding sections 124 is shown, and as shown in fig. 12, the relative position relationship between the different forward sweep angles α and the corresponding sections 124 is shown in a coordinate form, as can be seen from fig. 11 and 12, the forward sweep angle α of the front section of the blade 120 increases nonlinearly from 0 ° to 10 ° in the radial direction, then the forward sweep angle α of the rear section of the blade 120 decreases nonlinearly from 10 ° in the radial direction, the forward sweep angle α of the tip 122 position is 9.682 °, and the maximum forward sweep angle position is (x-R)/(R-R) ═ 0.8.
Referring to fig. 13 and 14, the third embodiment of the present invention is different from the second embodiment in that the forward sweep angle α of the first blade section gradually decreases in a non-linear distribution along the radial direction, the forward sweep angle α of the second blade section gradually increases in a non-linear distribution along the radial direction, and the maximum forward sweep angle of the blade 120 ranges from 8 ° to 20 °. The forward sweep angle α of the blade 120 decreases non-linearly from the blade root 121 to the blade tip 122, and then increases non-linearly, the forward sweep angle α at the position of the blade root 121 is the largest, and the forward sweep angle α at the transition position between the first blade section and the second blade section is the smallest.
As shown in fig. 13 and 14, the barycentric stack line 123 of the blade 120 is not only curved in the direction of the incoming wind, but also curved in the direction of the rotation of the blade 120, that is, the barycentric stack line 123 has both a forward sweep angle α and a forward bend angle, where the line FO is the barycentric stack line 123, the line AO is a vertical line perpendicular TO the axis of the hub 110, the line TO is the barycentric stack line 123 of the first blade section, the line FT is the barycentric stack line 123 of the second blade section, the angle formed by the line FO and the line AO is the forward sweep angle α, the drawing does not show the forward bend angle, the line TO and the forward sweep angle α of the line AO decrease non-linearly, the line FT and the forward sweep angle α of the line AO increase non-linearly, the forward sweep angle α at the position of the blade root 121 is the maximum, and as shown in fig. 13, the forward bend angle of the line FT is greater than the forward bend angle of the line TO.
The forward sweep angle alpha of the blade 120 is first decreased in a nonlinear manner from the blade root 121 to the blade tip 122, and then increased in a nonlinear manner, the forward sweep angle alpha at the position of the blade root 121 is the largest, and the position at which the forward sweep angle alpha is the smallest is positioned at the rear section of the blade 120, so that the forward sweep angle alpha at the front section of the blade 120 is within a certain angle range, the span direction of the section 124 of the blade 120 can be matched with the radial transport of airflow along the boundary layer, the axial flow diffusion of the blade 120 is effectively reduced, the leading edge bending angle of the suction surface 126 is smaller, the accumulation of the boundary layer on the surface of the blade 120 is effectively reduced, and the interference loss of the boundary layer is greatly reduced. Moreover, the distribution mode of the forward sweep angle α of the blade 120 that decreases first and increases last can make the spanwise distribution of the aerodynamic load along the blade 120 more uniform, and ensure that a certain forward sweep angle α and forward bend angle are provided at the position of the blade tip 122, so that the flow quality of the blade tip 122 is better, the pressure gradient of each radial section 124 of the blade 120 is reduced, and because the pressure gradient is a power source for the tip 122 to leak the vortex, the pressure gradient of each section 124 is reduced, so that the tip 122 to leak the vortex is improved, and the aerodynamic performance of the fan blade 100 is effectively improved. In addition, the distribution of the forward sweep angle alpha which is gradually decreased and then gradually increased is combined with the transformation of forward bending, so that the front edge bend angle of the suction surface 126 can be reduced, the impact of the air flow on the front edge is reduced, the air flow resonance phenomenon is reduced, the noise reduction effect is realized, and the acoustic performance is improved.
In this embodiment, the maximum forward sweep angle of the blade 120 is set to range from 8 ° to 20 °, the maximum forward sweep angle of the blade 120 may be 8 ° or 20 ° or any angle between 8 ° and 20 °, the forward sweep angle α of the blade root 121 is the largest, and the forward sweep angle α at the transition position between the first blade section and the second blade section is the smallest. For example, the diameter of the hub 110 is 32.4mm, the outer diameter of the blade 120 is 105mm, the forward sweep angle α of the blade 120 decreases in a logarithmic manner from the blade root 121 to the blade tip 122 and then increases in a nonlinear manner, the forward sweep angle α of the first blade section decreases in a logarithmic manner, the forward sweep angle α of the second blade section increases in an exponential manner and increases in a maximum forward sweep angle of 10 °, the forward sweep angle α of the blade 120 decreases in a nonlinear manner from 10 ° to 0 ° and then increases in a nonlinear manner from 0 ° to the blade root, so that a certain forward sweep angle α can be maintained at the positions of the blade root 121 and the blade tip 122, the full pressure and the efficiency of the rotation of the blade 100 are improved, the forward sweep angle α is prevented from being excessively large to affect the performance of the blade 100, the forward sweep of the blade root 121 and the blade tip 122 is beneficial to improving the load distribution of the blade 120 and enhancing the power capability of the blade 120 from static pressure distribution of the surface of the blade 120, and the distribution of the forward sweep angle α can reduce the kinetic energy of the blade tip 122, reducing gap flow losses.
In some embodiments, the minimum sweep angle may range from-5 ° to 5 °, the minimum sweep angle may be 8 °, 20 °, or any angle between 8 ° and 20 ° near the tip 122, and it should be noted that the minimum sweep angle may be a negative angle, which means that the sweep angle α of the blade 120 decreases nonlinearly from 10 ° to-5 ° and then increases nonlinearly from-5 ° when the maximum sweep angle is 10 ° and the sweep angle α of the blade 120 decreases nonlinearly from-5 ° to 0 ° when the minimum sweep angle is-5 °. On one hand, the forward sweep angle α distribution extends to a negative angle, which can facilitate uniform spanwise distribution of aerodynamic loads of the sections 124, can better match the radial airflow transportation of the boundary layer, reduce the pressure gradient of each section 124 in the radial direction, and facilitate improvement of tip 122 leakage vortex and noise reduction.
In some embodiments, the blades 120 are centered on the hub 110 along the radial cross-section 124 at a relative position of (x-R)/(R-R), where x-R represents the relative height of the cross-section 124 over the blades 120, R-R represents the height of the blades 120, and (x-R)/(R-R) may be understood as the relative position of the cross-section 124 along the radial direction over the height of the blades 120. Wherein, the minimum forward sweep angle position is (x-R)/(R-R) in the range of 0.6 to 0.9, and the maximum forward sweep angle position is (x-R)/(R-R) at 0, i.e. the position of the blade root 121. It can be understood that, by using the relative position of the section 124 on the height of the blade 120 to represent the position of the forward sweep angle α, the distribution of the forward sweep angle α and the section 124 can be reasonably arranged, a certain forward sweep angle α can be maintained at the position of the blade root 121 and the blade tip 122, the increase of the accumulated thickness of the boundary layer near the blade tip 122 and the increase of the flow loss can be avoided, the flow quality of the leading edge of the blade tip 122 is better, the pressure gradient of the blade 120 along each radial section 124 can be reduced, and the influence of the excessive forward sweep angle α on the performance of the fan blade 100 can be avoided.
In the third embodiment, as shown in fig. 15, the relative position relationship between the different forward sweep angles α and the corresponding sections 124 is shown, as shown in fig. 16, the relative position relationship between the different forward sweep angles α and the corresponding sections 124 is shown in a coordinate form, as can be seen from fig. 15 and 16, the forward sweep angle α of the front section of the blade 120 decreases from 8 ° to 0 ° in a non-linear manner in the radial direction, then the forward sweep angle α of the rear section of the blade 120 increases from 0 ° in a non-linear manner in the radial direction, the forward sweep angle α of the blade tip 122 position is 0.318 °, and the minimum forward sweep angle position is (x-R)/(R-R) ═ 0.8.
Referring to fig. 17, the heat dissipation fan 200 provided by the present invention includes the fan blades 100 of any of the embodiments described above, and therefore, the heat dissipation fan 200 also has the advantages of the embodiments described above.
As shown in fig. 17, the heat dissipation fan 200 further includes a current collector 220, a bracket 210, and a motor 230, wherein the bracket 210 is installed inside the current collector 220, the motor 230 is fixed on the bracket 210, and a rotating shaft of the motor 230 is connected to the shaft hole 111 of the fan blade 100. The collector 220, the bracket 210 and the motor 230 in the embodiment are all in the prior art, and the detailed structure is not described.
Referring to fig. 18, the present invention also provides a microwave oven 300 including the heat radiating fan 200 of the above-described embodiment.
Generally, the microwave oven 300 further includes a heating chamber 310, a magnetron 320, a transformer 330 or a frequency converter, a base plate 350, and a rear plate 340. The magnetron 320 is used for generating microwaves to heat food in the heating cavity 310, the transformer 330 or the frequency converter is used for supplying power to the magnetron 320, and the cooling fan 200 is used for cooling the magnetron 320 and the transformer 330 or the frequency converter, and the embodiment adopts the transformer 330 for supplying power. Wherein, the bottom plate 350 is connected with the rear plate 340, the heating chamber 310 and the transformer 330 are fixed on the bottom plate 350, the magnetron 320 is fixed on the heating chamber 310, and the cooling fan 200 is installed on the rear plate 340.
The performance of the cooling fan 200 using the conventional fan blade 100 and the fan blade 100 of the above embodiment is compared below.
As shown in fig. 1, the hub 110 of the conventional fan blade 100 has a diameter of 32.4mm, the outer diameter of the fan blade 120 is 106mm, the sweep angle is 0 °, and the operation performance of the heat dissipation fan 200 at 2500rpm is as follows: the maximum air volume is 123m3/h, the maximum air pressure is 56Pa, and the pneumatic noise is 47.38 dB.
The heat dissipating fan 200 employs the fan blade 100 of the first embodiment, as shown in fig. 5 and 6, the forward sweep angle α of the fan blade 120 increases linearly in the radial direction, the maximum forward sweep angle is 10 °, and the operation performance of the heat dissipating fan 200 at 2500rpm is: the maximum air volume is 128m3The maximum wind pressure is 61Pa, and the pneumatic noise is 46.5 dB.
The heat dissipation fan 200 employs the fan blade 100 of the second embodiment, as shown in fig. 9 and 10, the forward sweep angle α of the fan blade 120 increases non-linearly in the radial direction, and then decreases non-linearly, the maximum forward sweep angle is 10 °, and the maximum forward sweep angle position is (x-R)/(R-R) ═ 0.8. The operation performance of the cooling fan 200 at 2500rpm is as follows: the maximum air volume is 130m3The maximum wind pressure is 63Pa, and the pneumatic noise is 45.32 dB.
The heat dissipation fan 200 employs the fan blade 100 of the third embodiment, as shown in fig. 13 and 14, the forward sweep angle α of the fan blade 120 is first decreased in a non-linear manner and then increased in a non-linear manner, the maximum forward sweep angle is 8 °, the minimum forward sweep angle is 0 °, and the minimum forward sweep angle is (x-R)/(R-R) ═ 0.8. The operation performance of the cooling fan 200 at 2500rpm is as follows: maximum windThe amount is 125m3The maximum wind pressure is 58Pa, and the pneumatic noise is 46.12 dB.
Therefore, compared with the existing fan blade 100, the fan blade 100 of the three embodiments has the advantages that the maximum air volume and the maximum air pressure are improved, the noise can be effectively reduced, and the pneumatic performance and the acoustic performance of the fan blade 100 are improved.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of those skilled in the art without departing from the gist of the present invention.

Claims (8)

1. A fan blade, comprising:
a hub having a shaft hole;
the blades are distributed at intervals along the circumferential direction of the hub, the blades comprise a first blade section and a second blade section along the radial direction, the first blade section and the second blade section are swept forward, the forward sweep angle of the first blade section is gradually increased along the radial direction and is in nonlinear distribution, the forward sweep angle of the second blade section is gradually decreased along the radial direction and is in nonlinear distribution, and the maximum forward sweep angle of the blades ranges from 10 degrees to 25 degrees.
2. The fan blade of claim 1, wherein the minimum sweep angle of the blade ranges from 0 ° to 5 °.
3. The fan blade according to claim 2, wherein the blade has a radial cross section centered on the hub at a relative position of (x-R)/(R-R), the maximum forward sweep position is (x-R)/(R-R) in the range of 0.6 to 0.9, and the minimum forward sweep position is at x-R, where R is the hub radius, R is the blade outer diameter, and x is the radial height of the blade cross section.
4. A fan blade, comprising:
a hub having a shaft hole;
the blades are distributed at intervals along the circumferential direction of the hub, the blades sequentially comprise a first blade section and a second blade section along the radial direction, the first blade section and the second blade section are swept forward, the forward sweep angle of the first blade section is gradually reduced along the radial direction and is in nonlinear distribution, the forward sweep angle of the second blade section is gradually increased along the radial direction and is in nonlinear distribution, and the maximum forward sweep angle of the blades ranges from 8 degrees to 20 degrees.
5. The fan blade of claim 4, wherein the minimum sweep angle is in the range of-5 ° to 5 °.
6. The fan blade according to claim 5, wherein the blade has a radial cross section centered on the hub at a relative position of (x-R)/(R-R), the maximum forward sweep position is at x-R, and the minimum forward sweep position is at (x-R)/(R-R) in a range of 0.6 to 0.9, where R is the hub radius, R is the blade outer diameter, and x is the radial height of the blade cross section.
7. A heat dissipating fan comprising the fan blade as claimed in any one of claims 1 to 6.
8. A microwave oven comprising the heat radiating fan as claimed in claim 7.
CN202010135190.3A 2020-03-02 2020-03-02 Fan blade, cooling fan and microwave oven Active CN111255743B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010135190.3A CN111255743B (en) 2020-03-02 2020-03-02 Fan blade, cooling fan and microwave oven

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010135190.3A CN111255743B (en) 2020-03-02 2020-03-02 Fan blade, cooling fan and microwave oven

Publications (2)

Publication Number Publication Date
CN111255743A CN111255743A (en) 2020-06-09
CN111255743B true CN111255743B (en) 2021-10-22

Family

ID=70953062

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202010135190.3A Active CN111255743B (en) 2020-03-02 2020-03-02 Fan blade, cooling fan and microwave oven

Country Status (1)

Country Link
CN (1) CN111255743B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116398471A (en) * 2023-04-11 2023-07-07 威海克莱特菲尔风机股份有限公司 Sweepforward blade impeller and constitute axial fan

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000110785A (en) * 1998-10-05 2000-04-18 Calsonic Corp Axial fan
RU2377445C1 (en) * 2008-09-17 2009-12-27 Сергей Вячеславович Караджи Axial rotor
CN201339607Y (en) * 2008-12-31 2009-11-04 邱荣泉 Minitype radiating fan
CN102392831A (en) * 2011-11-24 2012-03-28 中国农业大学 Swept-curved blade for high-speed fuel oil axial-flow pump
CN202914389U (en) * 2012-12-03 2013-05-01 浙江泰达微电机有限公司 Axial flow fan
CN204878074U (en) * 2015-08-13 2015-12-16 扬州大学 Stator blade of back stator sweepforward of axial compressor pump station
CN207961060U (en) * 2017-12-30 2018-10-12 广东美的厨房电器制造有限公司 Fan and micro-wave oven

Also Published As

Publication number Publication date
CN111255743A (en) 2020-06-09

Similar Documents

Publication Publication Date Title
EP3839261B1 (en) Counter-rotating fan
CN211398054U (en) Diffusion device, fan and dust catcher
CN111255743B (en) Fan blade, cooling fan and microwave oven
CN109058161B (en) Axial flow wind wheel and air conditioner outdoor unit
WO2022062430A1 (en) Blade, axial flow airfoil, and fan
US11680580B2 (en) Axial-flow impeller and air-conditioner having the same
TW202237993A (en) Fan
CN210290259U (en) Impeller, fan and motor
US6911636B2 (en) Cooling fan for microwave oven
CN102966594A (en) Centrifugal fan, centrifugal blower and air-cooling type refrigeration equipment
CN108980104B (en) Axial fan and air conditioner with same
CN113586482B (en) Multi-wing centrifugal fan
CN108561332B (en) Fan and microwave oven
CN108953222B (en) Centrifugal impeller
CN108061059B (en) Fan and microwave oven
CN207961053U (en) Fan and micro-wave oven
CN220850131U (en) Fan blade and fan based on Mobius ring
RU2812993C1 (en) Wind turbine, fan and air conditioner
CN219711861U (en) Backward centrifugal wind wheel and centrifugal fan
CN216554519U (en) Centrifugal fan impeller structure and centrifugal fan
CN220227271U (en) Diagonal flow centrifugal wind wheel
CN209892508U (en) Axial flow fan blade and electric fan
CN216742163U (en) Air compressor machine fan blade case
EP4265914A1 (en) Wind wheel, fan, and air conditioner
CN217327807U (en) Centrifugal fan and centrifugal wind wheel thereof

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
GR01 Patent grant