CN111156191A - Impeller, mixed flow fan and air conditioner - Google Patents
Impeller, mixed flow fan and air conditioner Download PDFInfo
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- CN111156191A CN111156191A CN202010063828.7A CN202010063828A CN111156191A CN 111156191 A CN111156191 A CN 111156191A CN 202010063828 A CN202010063828 A CN 202010063828A CN 111156191 A CN111156191 A CN 111156191A
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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
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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
- F04D29/66—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
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 blades are connected between the inner surface of the wheel cover and the outer surface of the hub, each blade comprises a blade root connected with the outer surface of the hub 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-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 in the direction from the air inlet end to the air outlet end. The projection of the outer edge of the blade 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 gradually guides the airflow in the flow channel, thereby avoiding large pressure gradient and reducing flow loss.
Description
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. Designers have found that the pressure gradient of the airflow in the flow channel of the mixed flow fan in the related art is large, thereby causing great flow loss.
Disclosure of Invention
The invention provides an impeller, a mixed flow fan and an air conditioner, which are used for avoiding flow loss caused by large pressure gradient.
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
the blade comprises a blade root part connected with the outer surface of the hub and extending along the outer surface of the hub and a blade outer edge opposite to the blade root part, the projection of the contour line of the blade outer edge on the longitudinal projection plane passing through the axis is a variable-inclination-angle curve, the included angle between the tangent line of the variable-inclination-angle curve and the longitudinal datum line is gradually increased from the air inlet end to the air outlet end, and the longitudinal datum line is parallel to the axis.
In some embodiments, the variable-inclination curve comprises a first end point on the side of the air-inlet end and a second end point on the side of the air-outlet end, wherein an inlet included angle between a tangent of the variable-inclination curve at the first end point and the longitudinal reference line ranges from [20 °, 85 ° ]; and/or the exit included angle between the tangent of the variable inclination angle curve at the second end point and the longitudinal reference line is in the range of [10 degrees, 70 degrees ].
In some embodiments, the entrance angle is 50 ° and the exit angle is 57.7 °.
In some embodiments, the variable inclination curve is a first sigmoid curve.
In some embodiments, the first S-curve has an inflection point and includes first and second curve segments on opposite sides of the inflection point, respectively, with a range of ratios between a radius of curvature of the first curve segment and a radius of curvature of the second curve segment [0.2, 5 ].
In some embodiments, the radius of curvature of the first curved section is 125mm and the radius of curvature of the second curved section is 38 mm.
In some embodiments, the projection of the blade root onto the longitudinal plane of projection is a second sigmoid curve.
In some embodiments, the second S-shaped curve comprises a third end point on the side of the air inlet end and a fourth end point on the side of the air outlet end, wherein an inlet included angle between a tangent of the second S-shaped curve at the third end point and the transverse reference line ranges from [65 °, 120 ° ]; and/or the exit angle between the tangent of the second S-shaped curve at the fourth end point and the transverse reference line is in the range of [10 °, 65 ° ].
In some embodiments, the entrance angle between the tangent of the second S-shaped curve at the third end point and the transverse reference line is 91 °, and the entrance angle between the tangent of the second S-shaped curve at the fourth end point and the transverse reference line is 24 °.
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 blade is a twisted blade, the surface of the twisted blade includes a first curved surface section, a second curved surface section, and a third curved surface section that are sequentially arranged from the air inlet end to the air outlet end, and the second curved surface section is located between the first curved surface section and the third curved surface section and is recessed toward the rotation direction side of the impeller with respect to the first curved surface section and the third curved surface section.
In some embodiments, the first curved surface segment, the second curved surface segment, and the third curved surface segment are transitioned through a circular arc surface.
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 line.
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 blades are connected between the inner surface of the wheel cover and the outer surface of the hub, each blade comprises a blade root connected with the outer surface of the hub 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-inclination-angle curve, the included angle between the tangent line of the variable-inclination-angle curve and the longitudinal datum line is gradually increased from the air inlet end to the air outlet end, and the longitudinal datum line is parallel to the axis. The projection of the outer edge of the blade 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 gradually guides the airflow in the flow channel, thereby avoiding large pressure gradient and reducing flow loss.
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. 5 and fig. 10, 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, and the blades 2 comprise a blade root 24 connected to the outer surface of the hub 1 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 outer edge 22 of the blade on the longitudinal projection plane passing through the axis L 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 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 embodiments of the present invention needs to pass through the axis L of the impeller. Also for any blade, the longitudinal projection plane refers to the longitudinal projection plane of the blade facing in the direction of the axis L. For example, in fig. 4, a longitudinal projection plane corresponding to the blade located at the front side of the hub 1 and at the center among the blades 2 is a longitudinal projection plane parallel to the paper plane. That is, the position of the longitudinal projection plane differs for different blades. The longitudinal datum line of the embodiment of the invention is positioned in the longitudinal projection plane and is parallel to the axis L, and the transverse datum line is perpendicular to the axis L.
In some embodiments, as shown in fig. 10, the variable-inclination curve comprises a first end point B at the side of the air inlet end and a second 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 first 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 second end point 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 comprises a third end point a located on one side of the air inlet end and a fourth end point D located on one side of the air outlet end, wherein an inlet included angle m between a tangent of the second S-shaped curve at the third end point a and the transverse reference line is in a range of [65 °, 120 ° ]; the exit angle n between the tangent of the second S-curve at the fourth end point D and the transverse reference line is in the range [10 °, 65 ° ]. The transverse reference line here is also not an absolute transverse reference line, but is located in a longitudinal projection plane 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 third 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 fourth end point D and the transverse reference line is 24 °.
The second 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, the first curve segment having a curvature radius R4Radius of curvature R of the second curve segment3The ratio therebetween is in the range of [0, 3.5 ]]。
As shown in fig. 4, the blade 2 further comprises a leading edge 21 on the side of the air intake end. As shown in fig. 7, the projection of the contour line of the leading edge 21 on the transverse projection plane perpendicular to the axis L is a concave curve. That is, the front edge 21 of the blade 2 is substantially concave when the impeller is viewed from above, so that the air intake resistance is reduced and the direct impact on the blade is reduced, thereby improving the air intake fluency and enabling the fan to operate with high efficiency and low noise.
In the present embodiment, the blade 2 is a twisted blade. The twisted blade comprises three curved surface sections from an air inlet end to an air outlet end, wherein the three curved surface sections are a first curved surface section, a second curved surface section and a third curved surface section respectively, and the second curved surface section is positioned between the first curved surface section and the third curved surface section and is recessed towards one side of the rotation direction of the impeller relative to the first curved surface section and the third curved surface section. That is to say the twisted blade of this embodiment is two twisted structure, so set up and to reduce the air current flow separation in the internal flow channel, avoid the production of a large amount of eddies and then optimize the air current flow situation of whole fan.
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, where said outer side of the blade refers to the side away from the blade body. As shown in fig. 6, the impeller is viewed from below, and the trailing edge 23 of its blades 2 is generally concave in shape to avoid swirling of the gas flow during gassing and thus to optimize the gas flow.
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. 4, 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 fig. 6 and 7, in a plan view of the impeller, the front 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 front edge 21 is a concave curve connecting the first intersection point E and the second intersection point F. That is, the projection of the contour line of the leading edge 21 on the transverse projection plane perpendicular to the axis L is a concave curve. The projection of the blade 21 of the impeller of the embodiment in the transverse projection plane is a concave curve so as to reduce the air inlet resistance and the direct impact of the airflow on the blade, and further optimize the air inlet condition, so that the high-efficiency and low-noise operation of the fan is facilitated. In this embodiment, the concave curve is oriented opposite to the direction of rotation 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 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.
In the present embodiment, as shown in fig. 8 and 9, the trailing edge of the trailing edge 23 is projected as a concave arc. The flowing condition of the mixed flow fan can be optimized to the greatest extent by designing the trailing edge of the concave arc line, the flow separation of air flow in the internal flow passage of the mixed flow fan is reduced, and the generation of a large number of vortex shedding is avoided.
In practical application, two end points of the concave arc line are a second end point C and a fourth end point D, respectively, the chord line CD has a length in a range of [10mm,30mm ], an included angle e between a tangent line of the concave arc line at the second end point C and the chord line is in a range of [10 degrees, 50 degrees ], and an included angle f between a tangent line of the concave arc line at the fourth end point D and the chord line is in a range of [10 degrees, 50 degrees ]. Preferably, the chord line CD of the present embodiment has a length of 19mm, the included angle e between the tangent of the concave arc at the second end point C and the chord line is 31 °, and the included angle f between the tangent of the concave arc at the fourth end point D and the chord line is 31.5 °.
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 first end point B at the side of the air inlet end and a second 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 first 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 second end point 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 embodiment has a special form, so that the airflow flows in along the axis L of the impeller and then 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.
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 (16)
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
the blade comprises a plurality of blades (2), wherein the blades (2) are connected between the inner surface of the wheel cover (3) and the outer surface of the hub (1), each blade (2) comprises a blade root (24) which is connected with the outer surface of the hub (1) and extends 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-inclination-angle curve, the included angle between the tangent line of the variable-inclination-angle curve and a longitudinal datum line is gradually increased in the direction from the air inlet end to the air outlet end, and the longitudinal datum line is parallel to the axis (L).
2. The impeller of claim 1, wherein the variable-pitch curve comprises a first end point (B) on the side of the air inlet end and a second end point (C) on the side of the air outlet end, wherein an inlet angle (d) between a tangent of the variable-pitch curve at the first end point (B) and the longitudinal reference line ranges from [20 °, 85 ° ]; and/or the exit angle (g) between the tangent of the variable inclination curve at the second end point (C) and the longitudinal reference line is in the range of [10 °, 70 ° ].
3. The impeller according to claim 2, characterized in that said inlet angle (d) is 50 ° and said outlet angle (g) is 57.7 °.
4. The impeller of claim 1, wherein the variable-pitch curve is a first S-shaped curve.
5. The impeller of claim 4, wherein the first S-shaped curve has an inflection point and comprises a first curve segment and a second curve segment, respectively located on either side of the inflection point, the first curve segment having a radius of curvature (R)1) Radius of curvature (R) of said second curve segment2) The ratio therebetween is in the range of [0.2, 5]]。
6. The impeller of claim 5, wherein the radius of curvature (R) of the first curved section1) 125mm, the radius of curvature (R) of said second curved section2) Is 38 mm.
7. The impeller according to any one of claims 1 to 6, characterized in that the projection of the blade root (24) on the longitudinal projection plane is a second S-shaped curve.
8. The impeller of claim 7, wherein the second S-shaped curve comprises a third end point (a) on the side of the inlet end and a fourth end point (D) on the side of the outlet end, wherein an inlet angle (m) between a tangent of the second S-shaped curve at the third end point (a) and a transverse reference line is in the range of [65 °, 120 ° ]; and/or the exit angle (n) between the tangent of the second S-curve at the fourth end point (D) and the transverse reference line is in the range [10 °, 65 ° ].
9. The impeller according to claim 8, characterized in that the entry angle (m) between the tangent of the second S-shaped curve at the third end point (a) and a transverse reference line is 91 °, and the entry angle (n) between the tangent of the second S-shaped curve at the fourth end point (D) and a transverse reference line is 24 °.
10. The impeller according to any one of claims 1 to 6, characterized in that the blade (2) further comprises a leading edge (21) on the side of the air intake end, the projection of the contour line of the leading edge (21) on a transverse projection plane perpendicular to the axis (L) being a concave curve.
11. The impeller according to any one of claims 1 to 6, wherein the blade (2) is a twisted blade, the surface of the twisted blade comprises a first curved surface section, a second curved surface section and a third curved surface section which are sequentially arranged from the air inlet end to the air outlet end, and the second curved surface section is located between the first curved surface section and the third curved surface section and is recessed to one side of the rotation direction of the impeller relative to the first curved surface section and the third curved surface section.
12. The impeller of claim 11, wherein the first curved surface segment, the second curved surface segment, and the third curved surface segment are transitioned through a circular arc surface.
13. The impeller according to any one of claims 1 to 6, characterized in that the blade (2) further comprises a trailing edge (23) located on the side of the outlet end, the projection of the contour line of the trailing edge (23) on the longitudinal projection plane being a concave arc.
14. The impeller according to claim 1, characterized in that the number of blades (2) is between 6 and 20.
15. A mixed flow fan comprising an impeller as claimed in any one of claims 1 to 14.
16. An air conditioner comprising the mixed flow fan of claim 15.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010063828.7A CN111156191A (en) | 2020-01-20 | 2020-01-20 | Impeller, mixed flow fan and air conditioner |
| PCT/CN2020/139097 WO2021147606A1 (en) | 2020-01-20 | 2020-12-24 | Impeller, mixed flow blower and air conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010063828.7A CN111156191A (en) | 2020-01-20 | 2020-01-20 | Impeller, mixed flow fan and air conditioner |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111156191A true CN111156191A (en) | 2020-05-15 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010063828.7A Pending CN111156191A (en) | 2020-01-20 | 2020-01-20 | Impeller, mixed flow fan and air conditioner |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN111156191A (en) |
| WO (1) | WO2021147606A1 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112283800A (en) * | 2020-09-16 | 2021-01-29 | 珠海格力电器股份有限公司 | Machine and air conditioner in air conditioning |
| 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 |
| 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 |
| 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 |
| WO2022217956A1 (en) * | 2021-04-13 | 2022-10-20 | 浙江银轮机械股份有限公司 | Impeller and vehicle air conditioner blower |
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| CN2345758Y (en) * | 1998-05-13 | 1999-10-27 | 高歌 | Centrifugal pump impeller with twisted salix-leaf-type blade |
| JP2004044409A (en) * | 2002-07-09 | 2004-02-12 | Mitsubishi Heavy Ind Ltd | Water turbine and runner therefor |
| JP4094495B2 (en) * | 2003-06-16 | 2008-06-04 | 株式会社東芝 | Francis-type runner |
| CA2488714A1 (en) * | 2004-11-30 | 2006-05-30 | General Electric Canada | Runner for francis type hydraulic turbine |
| JP5314441B2 (en) * | 2009-01-20 | 2013-10-16 | 日立三菱水力株式会社 | Centrifugal hydraulic machine |
| GB2502104B (en) * | 2012-05-16 | 2016-01-27 | Dyson Technology Ltd | A fan |
| EP2829732B1 (en) * | 2013-05-10 | 2019-11-20 | LG Electronics Inc. | Centrifugal fan and method for manufacturing same |
| CN106402020A (en) * | 2016-10-31 | 2017-02-15 | 广东威灵电机制造有限公司 | Impeller and fan having same |
| CN108252949A (en) * | 2018-01-29 | 2018-07-06 | 广东美的厨房电器制造有限公司 | Mixed flow wind wheel and flow-mixing blower fan |
| CN110701097A (en) * | 2019-11-19 | 2020-01-17 | 东莞市盛沃高叶轮机械设计有限公司 | Mixed flow type impeller |
| 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 |
| 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 |
| 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 |
| 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 |
| 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 |
-
2020
- 2020-01-20 CN CN202010063828.7A patent/CN111156191A/en active Pending
- 2020-12-24 WO PCT/CN2020/139097 patent/WO2021147606A1/en active Application Filing
Cited By (5)
| 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 |
| 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 |
| 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 |
| CN112283800A (en) * | 2020-09-16 | 2021-01-29 | 珠海格力电器股份有限公司 | Machine and air conditioner in air conditioning |
| WO2022217956A1 (en) * | 2021-04-13 | 2022-10-20 | 浙江银轮机械股份有限公司 | Impeller and vehicle air conditioner blower |
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|---|---|
| WO2021147606A1 (en) | 2021-07-29 |
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