CN111441984A - Impeller, mixed flow fan and air conditioner - Google Patents

Impeller, mixed flow fan and air conditioner Download PDF

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Publication number
CN111441984A
CN111441984A CN202010063829.1A CN202010063829A CN111441984A CN 111441984 A CN111441984 A CN 111441984A CN 202010063829 A CN202010063829 A CN 202010063829A CN 111441984 A CN111441984 A CN 111441984A
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China
Prior art keywords
impeller
surface section
end point
blade
line
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Pending
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CN202010063829.1A
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Chinese (zh)
Inventor
谭建明
张治平
马屈杨
池晓龙
苏玉海
张碧瑶
夏凯
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Gree Electric Appliances Inc of Zhuhai
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Gree Electric Appliances Inc of Zhuhai
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Application filed by Gree Electric Appliances Inc of Zhuhai filed Critical Gree Electric Appliances Inc of Zhuhai
Priority to CN202010063829.1A priority Critical patent/CN111441984A/en
Publication of CN111441984A publication Critical patent/CN111441984A/en
Priority to PCT/CN2020/138941 priority patent/WO2021147605A1/en
Pending legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/26—Rotors specially for elastic fluids
    • 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

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

Abstract

The invention discloses an impeller, a mixed flow fan and an air conditioner. The impeller comprises a wheel cover, a wheel hub and a plurality of blades, wherein the wheel cover comprises an inner cavity which is communicated along an axis, and the inner cavity is provided with an air inlet end and an air outlet end which are oppositely arranged; the wheel hub is arranged in the wheel cover; the plurality of blades are connected between the inner surface of the shroud and the outer surface of the hub, and the blades are twisted blades, the surfaces of which include a first surface section, a second surface section, and a third surface section, the second surface section being located between the first surface section and the third surface section and being recessed toward the rotation direction side of the impeller with respect to the first surface section and the third surface section. The twisted blade is of a double-twisted structure, so that the surface of the blade extends in multiple directions, the change of multi-directional speed airflow is effectively adapted, airflow flowing separation in an internal flow passage is reduced, a large number of vortexes are avoided, and the airflow flowing condition of the whole fan is optimized.

Description

Impeller, mixed flow fan and air conditioner
Technical Field
The invention relates to the technical field of electric appliances, in particular to an impeller, a mixed flow fan and an air conditioner.
Background
The air path system is one of the components in the air conditioner for promoting the air in the active area of the air conditioner to exchange heat quickly. In the wind path system of the air conditioner, a designer selects and matches a proper fan according to actual requirements corresponding to different types and specifications of the air conditioner so as to meet the working quality and the use comfort of the air conditioner.
In order to meet the air volume and pressure head index of the air conditioner, the mixed flow fan is adopted in the air path system of the air conditioner in the related technology. Because the air inlet direction of the mixed flow fan generally follows the axis of the hub, and the air outlet direction generally inclines a certain angle relative to the axis, the air flow in the flow channel of the mixed flow fan comprises the component speeds along different directions. The blades of the mixed flow fan in the related art are smooth surfaces, so that air flows with different directional component speeds can generate a severe boundary separation phenomenon when passing through the surfaces of the blades, and further vortex is generated.
Disclosure of Invention
The invention provides an impeller, a mixed flow fan and an air conditioner, which are used for avoiding airflow flowing separation.
A first aspect of the present invention provides an impeller comprising:
the wheel cover comprises an inner cavity which is communicated along the axis, and the inner cavity is provided with an air inlet end and an air outlet end which are oppositely arranged;
the wheel hub is arranged in the wheel cover; and
and a plurality of blades connected between the inner surface of the shroud and the outer surface of the hub, wherein the blades are twisted blades, the surfaces of the twisted blades include a first surface section, a second surface section and a third surface section, and the second surface section is located between the first surface section and the third surface section and is recessed toward one side of the rotation direction of the impeller relative to the first surface section and the third surface section.
In some embodiments, the first surface segment, the second surface segment, and the third surface segment are transitioned through a circular arc surface therebetween.
In some embodiments, the surface of the twisted blade is curved and includes a first curved surface segment, a second curved surface segment, and a third curved surface segment.
In some embodiments, the blade further comprises a trailing edge located on the side of the air outlet end, and the projection of the contour line of the trailing edge on the longitudinal projection plane is a concave arc which is concave towards the outer side of the blade.
In some embodiments, the concave arc has a first end point and a second end point, and a chord line between the first end point and the second end point has a length in a range of [10mm,30mm ].
In some embodiments, the length of the chord line between the first end point and the second end point is 19 mm.
In some embodiments, the concave arc has a first end point and a second end point, wherein a tangent to the concave arc at the first end point is at an angle in the range of [10 °,50 ° ]; and/or the included angle between the tangent line of the concave arc line at the second end point and the chord line is [10 degrees and 50 degrees ].
In some embodiments, the concave arc has a first end point and a second end point, wherein a tangent to the concave arc at the first end point is at an angle ranging from 31 ° to the chord line; and/or the included angle between the tangent to the concave arc at the second end point and the chord line is 31.5 degrees.
In some embodiments, the blade comprises a blade root connected with and extending along the outer surface of the hub and a blade outer edge opposite to the blade root, the projection of the contour line of the blade outer edge on the longitudinal projection plane passing through the axis is a variable-pitch curve, and the included angle between the tangent line of the variable-pitch curve and the longitudinal datum line is gradually increased in the direction from the air inlet end to the air outlet end.
In some embodiments, the variable inclination curve is a first sigmoid curve.
In some embodiments, the projection of the blade root onto the longitudinal plane of projection is a second sigmoid curve.
In some embodiments, the blade further comprises a front edge positioned on one side of the air inlet end, and the projection of the contour line of the front edge on a transverse projection plane perpendicular to the axis is a concave curve.
In some embodiments, the number of blades is 6 to 20.
A second aspect of the invention provides a mixed flow fan comprising an impeller as in any one of the first aspects of the invention.
A third aspect of the invention provides an air conditioner comprising a mixed flow fan according to the second aspect of the invention.
Based on the technical scheme provided by the invention, the impeller comprises a wheel cover, a hub and a plurality of blades, wherein the wheel cover comprises an inner cavity which is communicated along an axis, and the inner cavity is provided with an air inlet end and an air outlet end which are oppositely arranged; the wheel hub is arranged in the wheel cover; the plurality of blades are connected between the inner surface of the shroud and the outer surface of the hub, and the blades are twisted blades, the surfaces of which include a first surface section, a second surface section, and a third surface section, the second surface section being located between the first surface section and the third surface section and being recessed toward the rotation direction side of the impeller with respect to the first surface section and the third surface section. The twisted blade is of a double-twisted structure, so that the surface of the blade extends in multiple directions, the change of multi-directional speed airflow is effectively adapted, airflow flowing separation in an internal flow passage is reduced, a large number of vortexes are avoided, and the airflow flowing condition of the whole fan is optimized.
Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
FIG. 1 is a schematic perspective view of an impeller according to an embodiment of the present invention;
FIG. 2 is a schematic cross-sectional view of the impeller shown in FIG. 1;
FIG. 3 is an enlarged partial schematic view of the impeller shown in FIG. 2;
FIG. 4 is a schematic view of the impeller shown in FIG. 1 with the shroud removed;
FIG. 5 is a perspective view of one of the blades of FIG. 4;
FIG. 6 is a schematic top view of the impeller shown in FIG. 1;
FIG. 7 is an enlarged partial schematic view of the impeller of FIG. 6;
FIG. 8 is a schematic bottom view of the impeller shown in FIG. 1;
fig. 9 to 11 are schematic perspective views of another blade in fig. 4 on a longitudinal projection plane;
FIG. 12 is a velocity vector diagram within an inlet flow path of a related art mixed flow fan;
fig. 13 is a velocity vector diagram in the mixed flow fan inlet flow channel according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may be otherwise variously oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.
The specific structure of the impeller according to the embodiment of the present invention will be described in detail with reference to fig. 1 to 13.
As shown in fig. 1, fig. 2, fig. 4 and fig. 5, the impeller according to the embodiment of the present invention includes a hub 1, a shroud 3 and a plurality of blades 2, wherein the shroud 3 includes an inner cavity passing through along an axis, and the inner cavity has an air inlet end and an air outlet end which are oppositely disposed; the wheel hub 1 is arranged in the wheel cover 3; a plurality of blades 2 are connected between the inner surface of the shroud 3 and the outer surface of the hub 1. The blade 2 is a twisted blade. The twisted blade comprises three surface sections from an air inlet end to an air outlet end, wherein the three curved surface sections are a first surface section, a second surface section and a third surface section respectively, and the second surface section is positioned between the first surface section and the third surface section and is concave towards one side of the rotation direction of the impeller relative to the first surface section and the third surface section. That is to say, the twisted blade of this embodiment is two twisted structures for the surface of blade extends to many directions, thereby effectively adapts to the change of multi-direction speed air current and then reduces the air current flow separation in the internal flow channel, avoids the production of a large amount of eddies and then optimizes the air current flow situation of whole fan.
The first surface section, the second surface section and the third surface section of the present embodiment are in transition through the arc surface, so that the speed direction of the air flow of the present embodiment cannot be suddenly changed when the air flow flows along the wall surface, and the generation of the vortex is further reduced.
Specifically, as shown in fig. 5, each surface segment of the twisted blade of the present embodiment is a curved surface segment, which is a first curved surface segment 2A, a second curved surface segment 2B, and a third curved surface segment 2C. Setting each surface segment as a curved surface segment makes the surface of the twisted blade of the present embodiment more adaptable to airflow having multiple velocity directions.
Further, the blade 2 of the present embodiment further includes a trailing edge 23 located on the side of the air outlet end, as shown in fig. 9, a projection of the trailing edge 23 on the longitudinal projection plane is a concave arc. And the concave camber line is concave towards the outer side of the blade. The outer side of the blade as referred to herein refers to the side remote from the body of the blade. As shown in fig. 6, the impeller is viewed from below from the bottom, and the trailing edge 23 of the blade 2 is concave to adapt to the airflow in different speed directions so as to avoid the formation of vortex when the airflow is discharged.
In practice, the two end points of the concave arc are the first end point C and the second end point D, respectively, the chord line CD has a length in the range of [10mm,30mm ], the included angle e between the tangent line of the concave arc at the first end point C and the chord line is in the range of [10 °,50 ° ], and the included angle f between the tangent line of the concave arc at the second end point D and the chord line is in the range of [10 °,50 ° ]. Preferably, the chord line CD of this embodiment has a length of 19mm, the included angle e between the tangent of the concave arc at the first end point C and the chord line is 31 °, and the included angle f between the tangent of the concave arc at the second end point D and the chord line is 31.5 °.
As shown in FIG. 5, the blade 2 comprises a blade root 24 connected with the outer surface of the hub 1 and extending along the outer surface of the hub 1 and a blade outer edge 22 opposite to the blade root 24. the projection of the contour line of the blade outer edge 22 on the longitudinal projection plane passing through the axis L is a variable-pitch curve, and the included angle between the tangent line of the variable-pitch curve and the longitudinal reference line is gradually increased in the direction from the air inlet end to the air outlet end.
The projection of the outer edge 22 of the blade in the embodiment of the invention on the longitudinal projection plane is a variable-inclination-angle curve, and the included angle between the tangent line of the variable-inclination-angle curve and the longitudinal datum line is gradually increased, so that the blade in the embodiment guides the airflow in the flow channel step by step, thereby avoiding large pressure gradient and reducing flow loss.
It should be noted that the transverse projection plane of the embodiment of the present invention is perpendicular to the axis L of the impeller, the longitudinal projection plane of the embodiment of the present invention is required to pass through the axis L of the impeller, and for any one blade, the longitudinal projection plane refers to the longitudinal projection plane facing the direction of the axis L, for example, the longitudinal projection plane corresponding to the blade located at the front side of the hub 1 and at the middle of the blade in fig. 4 is the longitudinal projection plane parallel to the paper plane, that is, the position of the longitudinal projection plane is different for different blades, the longitudinal reference line of the embodiment of the present invention is located in the longitudinal projection plane and parallel to the axis L, and the transverse reference line is perpendicular to the axis L.
In some embodiments, as shown in fig. 10, the variable inclination curve comprises a third end point B at the side of the air inlet end and a first end point C at the side of the air outlet end, wherein an inlet included angle d between a tangent of the variable inclination curve at the third end point B and the longitudinal reference line is in the range of [20 °, 85 ° ]. The exit angle g between the tangent of the variable slope curve at the first endpoint C and the longitudinal reference line is in the range of [10 °, 70 ° ].
Alternatively, the flow loss of the gas stream was minimized by testing the inlet angle d at 50 ° and the outlet angle g at 57.7 °.
In the present embodiment, as shown in fig. 10, the variable inclination angle curve is a first S-shaped curve. Specifically, the first S-shaped curve of the present embodiment has an inflection point and includes a first curve segment and a second curve segment respectively located at both sides of the inflection point, and a ratio range between a curvature radius R1 of the first curve segment and a curvature radius R2 of the second curve segment is [0.2, 5 ].
Alternatively, it has been experimentally confirmed that the flow loss of the air stream is minimized when the radius of curvature R1 of the first curved section is set to 125mm and the radius of curvature R2 of the second curved section is set to 38 mm.
As shown in fig. 11, in the present embodiment, the projection of the blade root 24 on the longitudinal projection plane is a second S-shaped curve.
Specifically, the second S-shaped curve includes a fourth end point A on the side of the air inlet end and a second end point D on the side of the air outlet end, wherein an entrance angle m between a tangent of the second S-shaped curve at the fourth end point A and the transverse reference line is in the range of [65 degrees, 120 degrees ], an exit angle n between a tangent of the second S-shaped curve at the fourth end point D and the transverse reference line is in the range of [10 degrees, 65 degrees ], and the transverse reference line is not an absolute transverse reference line but is positioned in a longitudinal projection plane passing through the axis L and perpendicular to the axis L.
Optionally, an entrance angle m between a tangent of the second S-shaped curve at the fourth end point a and the transverse reference line is 91 °, and an entrance angle n between a tangent of the second S-shaped curve at the second end point D and the transverse reference line is 24 °.
As shown in fig. 5, the vane 2 further comprises a front edge 21 at the side of the air inlet end, as shown in fig. 6 and 7, the projection of the contour line of the front edge 21 on the transverse projection plane perpendicular to the axis L is a concave curve, that is, the front edge 21 of the vane 2 is approximately concave when the impeller is viewed from the top, so that the air inlet resistance and the direct impact on the vane are reduced, the air inlet fluency is improved, and the fan can operate efficiently and at low noise.
It should be noted that the transverse projection plane of the embodiment of the present invention is not an absolute transverse projection plane, but is a relative transverse projection plane that is perpendicular to the axis L of the impeller regardless of the placement of the impeller.
When the impeller of the present embodiment is applied to a mixed flow fan and the mixed flow fan is applied to an air conditioner, the number of blades is set to 6 to 20.
The structure of the impeller according to the embodiment of the present invention will be described in detail with reference to fig. 1 to 11.
As shown in fig. 1, the impeller of the present embodiment includes a hub 1, a shroud 3, and a plurality of blades 2; wherein. The wheel cover 3 is provided with an inner cavity which is communicated along the axis, and the inner cavity is provided with an air inlet end and an air outlet end which are respectively positioned at the two ends. Wherein, the air inlet end is located the upside, and the air outlet end is located the downside. As shown in fig. 2, the outer surface of the hub 1 is generally conical. The wheel cover 3 is coaxially sleeved outside the wheel hub 1. A plurality of blades 2 are connected between the outer surface of the hub 1 and the inner surface of the shroud 3. As shown in fig. 5, each blade 2 includes a leading edge 21 on the side of the wind inlet end, a trailing edge 23 on the side of the wind outlet end, a blade root 23 connected to the outer surface of the hub 1 and extending along the outer surface of the hub 1, and an outer edge 22 opposite to the blade root 23.
As shown in FIGS. 6 and 7, in a top view of the impeller, the leading edge 21 of the present embodiment has a first intersection point E intersecting the hub 1 and a second intersection point F intersecting the shroud 3, and in this case, the leading edge 21 is a concave curve connecting the first intersection point E and the second intersection point F. that is, a projection of a contour line of the leading edge 21 on a transverse projection plane perpendicular to the axis L is a concave curve.
In the present embodiment, the concave curve is oriented in the same direction as the rotation direction of the impeller. Specifically, as shown in fig. 7, the impeller of the present embodiment rotates counterclockwise. The arrangement can further improve the air inlet fluency.
Specifically, the concave curve of the present embodiment includes a leaf line. The following equation may be used, for example, to obtain the leaf-line locus.
x＝p*m1*k*t/n1+t3；
y＝m1*k*t2/n2+t3；
Wherein the content of the first and second substances,k is a parameter for adjusting the chord length of the concave curve; p ═ 1 to adjust the orientation of the concave curve; t has a value range of; m is1、n1、n2For adjusting the degree of curvature of the concave curve.
In the present embodiment, as shown in fig. 6 and 7, the angle a between the tangent line of the concave curve at the first intersection point E and the tangent line of the contour line of the hub 1 at the first intersection point E ranges from [20 °, 150 ° ], and preferably, the angle a is 70 °. And the angle b between the tangent to the concave curve at the second point of intersection F and the tangent to the shroud 3 at the second point of intersection F is in the range [20 °, 150 °, preferably the angle b is 78.5 °.
In the present embodiment, the projection of the maximum bending point O of the concave curve on the chord line connecting the first intersection point E and the second intersection point F is 20% to 85% of the chord length from the first intersection point a. The maximum bending point O here means a point on the concave curve at which the distance from the chord line is maximum.
The distance c between the maximum bending line O and the chord line in this embodiment ranges from 2mm, 12 mm. Preferably, the distance c between the maximum bending line O and the chord line is 2.4 mm.
As shown in fig. 3, the projection of the leading edge 21 on the longitudinal projection plane is an inclined line, and the vertical distance between the inclined line and the transverse reference line gradually increases in the extending direction from the radially inner side to the radially outer side. The transverse reference line herein refers to a transverse reference line that passes through the radially inner end point of the inclined line and is perpendicular to the axis. Preferably, the maximum vertical distance h between the tilting line and the transverse reference line is in the range of [0, 15mm ]. More preferably, h is 6.7 mm.
In some embodiments, the number of blades is 6 to 20.
Fig. 9 to 11 are projections of a single blade on a longitudinal projection plane.
As shown in fig. 10, the projection of the outer edge 22 of the blade 2 of the present embodiment on the longitudinal projection plane is a variable-inclination-angle arc, and the inclination angle between the tangent of the variable-inclination-angle arc and the longitudinal reference line gradually increases in the direction from the air inlet end to the air outlet end.
Specifically, as shown in fig. 10, the outer edge 22 of the present embodiment is an S-shaped curve.
In some embodiments, as shown in fig. 10, the variable inclination curve comprises a third end point B at the side of the air inlet end and a first end point C at the side of the air outlet end, wherein an inlet included angle d between a tangent of the variable inclination curve at the third end point B and the longitudinal reference line is in the range of [20 °, 85 ° ]. The exit angle g between the tangent of the variable slope curve at the first endpoint C and the longitudinal reference line is in the range of [10 °, 70 ° ].
Alternatively, the flow loss of the gas stream was minimized by testing the inlet angle d at 50 ° and the outlet angle g at 57.7 °.
Through the optimized design, as shown in fig. 2, the internal flow channel of the mixed flow fan of the present embodiment is specially shaped, so that the air flow flows in along the impeller axis L and flows out obliquely, specifically, in the longitudinal projection plane, the impeller flow channel of the present embodiment is approximately the flow channel curve M1M2The flow path curve M1M2The included angle α between the tangent line at the air inlet end and the longitudinal reference line is [0, 30 °]The included angle β between the tangent line at the air outlet end and the transverse reference line is [0, 80 °]. Optionally, the flow path curve M1M2An included angle α between the tangent line at the air inlet end and the longitudinal reference line is 10 degrees, and an included angle β between the tangent line at the air outlet end and the transverse reference line is 40 degrees.
The simulation experiment is carried out on the mixed flow fan of the embodiment, and the simulation is compared with the simulation of the mixed flow fan before optimization, the experimental data are shown in the following table, and in the simulation experiment, a noise measuring point is 0.5m of the outlet of the fan.
Figure BDA0002375350460000101
According to simulation data, under the condition that the air quantity is close, the rotating speed of the fan is obviously reduced after optimization, the noise value is reduced under the same air quantity, the operation efficiency and the pressure head are improved, and the pneumatic performance and the air noise level of the fan are obviously improved. Through the comparison of the velocity vector diagrams shown in fig. 12 and fig. 13, it can be found that after optimization, the air flow entering direction along the guide ring is obviously changed, the air flow deviates to the middle of the flow channel, the flow velocity distribution is more uniform through air inlet rectification, and the velocity gradient is obviously slowed down.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention and not to limit it; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art will understand that: modifications to the specific embodiments of the invention or equivalent substitutions for parts of the technical features may be made; without departing from the spirit of the present invention, it is intended to cover all aspects of the invention as defined by the appended claims.

Claims (15)

1. An impeller, comprising:
the wheel cover (3) comprises an inner cavity which is communicated along the axis, and the inner cavity is provided with an air inlet end and an air outlet end which are oppositely arranged;
a hub (1) arranged in the wheel cover (3); and
a plurality of blades (2) connected between an inner surface of the shroud (3) and an outer surface of the hub (1), and the blades (2) are twisted blades whose surfaces include a first surface section, a second surface section, and a third surface section, the second surface section being located between the first surface section and the third surface section and being recessed to one side of a rotation direction of the impeller with respect to the first surface section and the third surface section.
2. The impeller according to claim 1, characterized in that said first surface section, said second surface section and said third surface section are transited by a circular arc surface.
3. The impeller of claim 1, wherein the surface of the twisted blade is curved and includes a first track segment, a second curved segment, and a third curved segment.
4. The impeller of claim 1, wherein the blade (2) further comprises a trailing edge (23) located on the side of the air outlet end, the projection of the contour line of the trailing edge (23) on a longitudinal projection plane through the axis being a concave arc, the concave arc being concave toward the outer side of the blade.
5. The impeller according to claim 4, characterized in that said concave camber line has a first end point (C) and a second end point (D), a chord line between said first end point (C) and said second end point (D) having a length in the range [10mm,30mm ].
6. The impeller of claim 5, wherein the length of a chord line between the first end point (C) and the second end point (D) is 19 mm.
7. The impeller according to claim 4, wherein said concave arc has a first end point (C) and a second end point (D), wherein an angle (e) between a tangent of said concave arc at said first end point (C) and a chord line ranges from [10 °,50 ° ]; and/or the included angle (f) between the tangent of the concave arc line at the second end point (D) and the chord line is [10 degrees, 50 degrees ].
8. The impeller according to claim 4, wherein said concave arc has a first end point (C) and a second end point (D), wherein an angle (e) between a tangent of said concave arc at said first end point (C) and a chord line is in the range of 31 °; and/or the included angle (f) between the tangent of the concave arc at the second end point (D) and the chord line is 31.5 degrees.
9. The impeller as claimed in any one of claims 1 to 8, characterized in that the blade comprises a blade root (24) connected to and extending along the outer surface of the hub (1) and a blade outer edge (22) opposite the blade root (24), the projection of the contour line of the blade outer edge (22) on a longitudinal projection plane through the axis (L) being a variable pitch curve, the angle between the tangent of the variable pitch curve and a longitudinal reference line increasing in the direction from the inlet end to the outlet end.
10. The impeller of claim 9, wherein the variable-pitch curve is a first S-shaped curve.
11. The impeller according to claim 9, characterized in that the projection of the blade root (24) on the longitudinal projection plane is a second S-shaped curve.
12. The impeller of any one of claims 1 to 8, wherein the blade (2) further comprises a leading edge (21) located on the side of the air intake end, and a projection of a contour line of the leading edge (21) on a transverse projection plane perpendicular to the axis (L) is a concave curve.
13. The impeller according to claim 1, characterized in that the number of blades (2) is between 6 and 20.
14. A mixed flow fan comprising an impeller as claimed in any one of claims 1 to 13.
15. An air conditioner comprising the mixed flow fan of claim 14.
CN202010063829.1A 2020-01-20 2020-01-20 Impeller, mixed flow fan and air conditioner Pending CN111441984A (en)

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WO2021147605A1 (en) * 2020-01-20 2021-07-29 珠海格力电器股份有限公司 Impeller, mixed flow blower, and air conditioner
WO2021147604A1 (en) * 2020-01-20 2021-07-29 珠海格力电器股份有限公司 Impeller, mixed-flow fan, and air conditioner
WO2021147606A1 (en) * 2020-01-20 2021-07-29 珠海格力电器股份有限公司 Impeller, mixed flow blower and air conditioner
WO2023226379A1 (en) * 2022-05-27 2023-11-30 珠海格力电器股份有限公司 Mixed flow fan and ducted air conditioner

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JP4094495B2 (en) * 2003-06-16 2008-06-04 株式会社東芝 Francis-type runner
CN111441984A (en) * 2020-01-20 2020-07-24 珠海格力电器股份有限公司 Impeller, mixed flow fan and air conditioner
CN111255738A (en) * 2020-01-20 2020-06-09 珠海格力电器股份有限公司 Impeller, mixed flow fan and air conditioner
CN211501072U (en) * 2020-01-20 2020-09-15 珠海格力电器股份有限公司 Impeller, mixed flow fan and air conditioner
CN111156191A (en) * 2020-01-20 2020-05-15 珠海格力电器股份有限公司 Impeller, mixed flow fan and air conditioner
CN211715393U (en) * 2020-01-20 2020-10-20 珠海格力电器股份有限公司 Impeller, mixed flow fan and air conditioner
CN211449177U (en) * 2020-01-20 2020-09-08 珠海格力电器股份有限公司 Impeller, mixed flow fan and air conditioner

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Publication number Priority date Publication date Assignee Title
WO2021147605A1 (en) * 2020-01-20 2021-07-29 珠海格力电器股份有限公司 Impeller, mixed flow blower, and air conditioner
WO2021147604A1 (en) * 2020-01-20 2021-07-29 珠海格力电器股份有限公司 Impeller, mixed-flow fan, and air conditioner
WO2021147606A1 (en) * 2020-01-20 2021-07-29 珠海格力电器股份有限公司 Impeller, mixed flow blower and air conditioner
WO2023226379A1 (en) * 2022-05-27 2023-11-30 珠海格力电器股份有限公司 Mixed flow fan and ducted air conditioner

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