CN212479687U - Centrifugal impeller, centrifugal fan and refrigeration equipment - Google Patents

Centrifugal impeller, centrifugal fan and refrigeration equipment Download PDF

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Publication number
CN212479687U
CN212479687U CN202022041633.0U CN202022041633U CN212479687U CN 212479687 U CN212479687 U CN 212479687U CN 202022041633 U CN202022041633 U CN 202022041633U CN 212479687 U CN212479687 U CN 212479687U
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Prior art keywords
centrifugal impeller
line
blade
central axis
plane
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CN202022041633.0U
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Chinese (zh)
Inventor
卓明胜
汤雁翔
陈帆
崔剑飞
刘司轶
朱国善
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Gree Electric Appliances Inc of Zhuhai
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Gree Electric Appliances Inc of Zhuhai
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Abstract

The utility model relates to a centrifugal impeller, centrifugal fan and refrigeration plant for alleviate the problem of centrifugal impeller inefficiency. Wherein, centrifugal impeller includes: a first wheel disc; the second wheel disc and the first wheel disc are arranged at intervals along the axial direction of the centrifugal impeller; and a blade connected between the first disk and the second disk, the blade including a leading edge and a trailing edge in an airflow direction; the part that the trailing edge is connected with first rim plate is first end, the part that the trailing edge is connected with the second rim plate is the second end, first end for the second end is farther away from centrifugal impeller's the central axis. The utility model discloses can improve near the air current in the runner of first rim plate and flow, the separation that flows in the runner reduces the air current loss of flowing between the control blade, promotes centrifugal impeller's work efficiency.

Description

Centrifugal impeller, centrifugal fan and refrigeration equipment
Technical Field
The utility model relates to an impeller field especially relates to a centrifugal impeller, centrifugal fan and refrigeration plant.
Background
The centrifugal impeller is a wind wheel which supplies air in the axial direction and discharges air in the radial direction, and applies work by utilizing centrifugal force to improve the pressure of the air. The inventors have found that the centrifugal impeller in the related art has a problem of low efficiency.
Disclosure of Invention
Some embodiments of the utility model provide a centrifugal impeller, centrifugal fan and refrigeration plant for alleviate the problem of centrifugal impeller inefficiency.
Some embodiments of the utility model provide a centrifugal impeller, it includes:
a first wheel disc;
the second wheel disc and the first wheel disc are arranged at intervals along the axial direction of the centrifugal impeller; and
a blade coupled between the first disk and the second disk, the blade including a leading edge and a trailing edge in an airflow direction; the part that the trailing edge is connected with first rim plate is first end, the part that the trailing edge is connected with the second rim plate is the second end, first end for the second end is farther away from centrifugal impeller's the central axis.
In some embodiments, the first disk is upstream of the second disk in the airflow direction.
In some embodiments, a line connecting the first end and the second end is a first line, and an angle a between the first line and a central axis of the centrifugal impeller is in a range of 10 ° < a <20 °.
In some embodiments, the second line and the third line have an included angle therebetween that is greater than zero; wherein the content of the first and second substances,
a plane perpendicular to the central axis of the centrifugal impeller is a first plane;
the intersection point of the central axis of the centrifugal impeller and the first plane is a first intersection point;
the projection of the first end on the first plane is a first projection point;
the projection of the second end on the first plane is a second projection point;
the second line is a connecting line between the first projection point and the first intersection point;
the third line is a connecting line between the second projection point and the first intersection point.
In some embodiments, the location where the leading edge connects to the first disk is a third end, and the location where the leading edge connects to the second disk is a fourth end, the third end being remote from the central axis of the centrifugal impeller relative to the fourth end.
In some embodiments, a line connecting the third end and the fourth end is a fourth line, and an angle b between the fourth line and a central axis of the centrifugal impeller is in a range of 10 ° < b <20 °.
In some embodiments, the fifth line and the sixth line have an included angle therebetween that is greater than zero; wherein the content of the first and second substances,
a plane perpendicular to the central axis of the centrifugal impeller is a first plane;
the intersection point of the central axis of the centrifugal impeller and the first plane is a first intersection point;
the projection of the third end on the first plane is a third projection point;
the projection of the fourth end on the first plane is a fourth projection point;
the fifth line is a connecting line of the third projection point and the first intersection point;
the sixth line is a connection line between the fourth projection point and the first intersection point.
In some embodiments, the angle between the fifth line and the sixth line ranges from 5 ° to 12 °.
In some embodiments, an inlet angle c at the leading edge tapers in a direction from the first disk to the second disk;
wherein the inlet angle c at the leading edge is the angle between the tangent of the leading edge on the blade profile and the profile of the blade.
In some embodiments, the difference between the maximum inlet angle and the minimum inlet angle at the leading edge is less than or equal to 18 °.
In some embodiments, the blade comprises a plurality of profiles, a line connecting the leading edge of each profile and the second intersection point O is a seventh line, a line connecting the trailing edge of each profile and the second intersection point O is an eighth line, and an included angle between the seventh line and the eighth line is a wrap angle d; in wrap angles d of all profiles of the blade, the difference between the maximum wrap angle and the minimum wrap angle is less than or equal to 15 degrees; the plane where the molded surface is located is a second plane, and the intersection point of the second plane and the central axis of the centrifugal impeller is a second intersection point 0.
In some embodiments, a thickness of the vane between the leading edge and the trailing edge is greater than a thickness of the leading edge and a thickness of the trailing edge in the airflow direction.
In some embodiments, the trailing edge is configured as a straight line, or alternatively, the trailing edge is configured as an arc line with a concave portion inward.
In some embodiments, the centrifugal impeller satisfies the following relationship:
2×D0/(D1max+D1min)=0.9~1.1
wherein D is0Is the radius at the entrance of the first wheel disc;
D1maxthe distance between the third end of the blade and the central axis of the centrifugal impeller;
D1minfrom the fourth end of the blade to the centrifugal impellerIs measured in the center axis.
In some embodiments, the centrifugal impeller satisfies the following relationship:
(D1max+D1min)/(D2max+D2min)=0.6~0.75
wherein D is1maxThe distance between the third end of the blade and the central axis of the centrifugal impeller;
D1minthe distance between the fourth end of the blade and the central axis of the centrifugal impeller;
D2maxthe distance between the first ends of the blades and the central axis of the centrifugal impeller;
D2minis the distance between the second ends of the blades to the central axis of the centrifugal impeller.
Some embodiments of the present invention provide a centrifugal fan comprising the above-mentioned centrifugal impeller.
Some embodiments of the utility model provide a refrigeration plant, it includes foretell centrifugal fan.
In some embodiments, the refrigeration appliance is an air conditioner.
Based on the technical scheme, the utility model discloses following beneficial effect has at least:
in some embodiments, the centrifugal impeller comprises a first disk, a second disk, and blades; the second wheel disc and the first wheel disc are arranged at intervals along the axial direction of the centrifugal impeller; the blades are arranged between the first wheel disc and the second wheel disc; the blade includes along the leading edge and the trailing edge of air current flow direction, and the first end that the trailing edge of blade is connected with first rim plate is held more far away from centrifugal impeller's central axis for the second that trailing edge and second rim plate are connected, can improve the air current flow in the near runner of first rim plate, and the flow separation in the runner between the control blade reduces the air current loss of flowing, promotes centrifugal impeller's work efficiency.
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 undue limitation to the invention. In the drawings:
fig. 1 is a three-dimensional schematic view of a centrifugal impeller provided in accordance with some embodiments of the present invention;
fig. 2 is a schematic top view of a centrifugal impeller provided in accordance with some embodiments of the present invention;
fig. 3 is a three-dimensional schematic view of a blade provided in accordance with some embodiments of the present invention;
fig. 4 is a schematic profile view of a blade provided according to some embodiments of the present invention;
fig. 5 is a schematic cross-sectional view of a centrifugal impeller provided in accordance with some embodiments of the present invention;
fig. 6 is a three-dimensional schematic view of a blade provided in accordance with further embodiments of the present invention;
fig. 7 is a schematic cross-sectional view of a centrifugal impeller provided in accordance with further embodiments of the present invention.
The reference numbers in the drawings illustrate the following:
1-a first wheel;
2-a second wheel disc;
3-a blade; 31-leading edge; 32-trailing edge; 33-a first connection face; 34-a second connection face; 301-a first end; 302-a second end; 303-a third terminal; 304-fourth end.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only some of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be taken as limiting the scope of the invention.
As shown in fig. 1 and 2, some embodiments provide a centrifugal impeller comprising a first disk 1, a second disk 2 and blades 3.
The second wheel disc 2 and the first wheel disc 1 are arranged at intervals along the axial direction of the centrifugal impeller. The blade 3 is arranged between the first wheel disc 1 and the second wheel disc 2, and the blade 3 is connected with the first wheel disc 1 and the second wheel disc 2.
As shown in fig. 3, a portion where the blade 3 is connected to the first disk 1 is a first connection surface 33, and a portion where the blade 3 is connected to the second disk 2 is a second connection surface 34.
The blade 3 comprises a leading edge 31 and a trailing edge 32 in the flow direction of the air flow. The airflow flows through the front edge 31 of the blade 3 along the axial direction of the centrifugal impeller, and the airflow flows to the tail edge 32 of the blade 3 along the radial direction of the centrifugal impeller under the guiding action of the blade 3; axial air inlet and radial air outlet of the centrifugal impeller are realized.
The portion of the trailing edge 32 that connects to the first wheel disc 1 is the first end 301; the location where the trailing edge 32 joins the second disc 2 is the second end 302. The first end 301 is further away from the central axis of the centrifugal impeller than the second end 302.
That is, the first end 301 and the second end 302 are projected on the first plane, and the distance from the first end 301 to the first intersection point is greater than the distance from the second end 302 to the first intersection point. Wherein, the plane perpendicular to the central axis of the centrifugal impeller is a first plane; the intersection point of the central axis of the centrifugal impeller and the first plane is a first intersection point. The structure can improve the flow in the blade channel, and reduce the pressure difference between the pressure surface and the suction surface of the blade, thereby reducing the stress of the blade, reducing the power of the blade and improving the efficiency.
The leading edge 31 is located between the first connection face 33 and the second connection face 34, and connects the first connection face 33 and the second connection face 34. The trailing edge 32 is located between the first connection face 33 and the second connection face 34, and connects the first connection face 33 and the second connection face 34. A first end 301 of the trailing edge 32 to which the first disc 1 is attached is located at the first joint face 33 and a second end 302 of the trailing edge 32 to which the second disc 2 is attached is located at the second joint face 34. A third end 303 of the leading edge 31, which is connected to the first wheel disc 1, is located at the first connection face 33 and a fourth end 304 of the leading edge 31, which is connected to the second wheel disc 2, is located at the second connection face 34.
Be equipped with two above blades 3 between first rim plate 1 and the second rim plate 22, form the runner between two adjacent blades 3, the centrifugal impeller is rotatory to do work and realize the air supply to the air current, first end 301 that trailing edge 32 and first rim plate 1 of at least one blade 3 are connected is farther away from centrifugal impeller's the central axis for second end 302 that trailing edge 32 and second rim plate 2 are connected, this structure sets up can be under the condition that does not additionally increase the technology procedure, improve the air current flow in the near runner of first rim plate 1, control the flow separation in the runner between the blade, reduce the air current loss of flowing, promote centrifugal impeller's work efficiency.
In some embodiments, the first disk 1 has a central aperture, which is an air flow inlet. A hub is arranged on the second wheel disc 2, the hub extends towards the first wheel disc 22, and each blade 3 is arranged around the hub.
In some embodiments, the first wheel 1 is located upstream of the second wheel 2 in the direction of airflow. The first wheel 1 first meets the air flow with respect to the second wheel 2.
The central hole on the first wheel disc 1 is an airflow inlet, airflow flows to the airflow inlet of the first wheel disc 1 along the axial direction of the centrifugal impeller, after passing through the airflow inlet of the first wheel disc 1, the airflow flows to the radial direction of the centrifugal impeller under the guiding action of the blades 3, and finally, the airflow is discharged at the tail edge of the blades 3.
In some embodiments, as shown in fig. 5, a line connecting the first end 301 and the second end 302 is a first line, and the first line has an angle a greater than zero with a central axis of the centrifugal impeller, and the angle a is in a range of 10 ° < a <20 °. Through experimental comparison, under the same working condition, the numerical range is favorable for improving the static pressure efficiency of the fan relative to other numerical ranges.
In some embodiments, the second line and the third line have an included angle therebetween that is greater than zero; wherein the content of the first and second substances,
a plane perpendicular to the central axis of the centrifugal impeller is a first plane;
the intersection point of the central axis of the centrifugal impeller and the first plane is a first intersection point;
the projection of the first end 301 on the first plane is a first projection point;
the projection of the second end 302 on the first plane is a second projection point;
the second line is a connecting line of the first projection point and the first intersection point;
the third line is a connecting line between the second projection point and the first intersection point.
In some embodiments, as shown in fig. 2 and 5, the point where the leading edge 31 is connected to the first disk 1 is a third end 303, the point where the leading edge 31 is connected to the second disk 2 is a fourth end 304, and the third end 303 is away from the central axis of the centrifugal impeller with respect to the fourth end 304.
In some embodiments, as shown in fig. 5, the third end 303 and the fourth end 304 are connected by a fourth line, and the fourth line has an angle b greater than zero with the central axis of the centrifugal impeller, and the angle b is in a range of 10 ° < b <20 °.
In some embodiments, the fifth line and the sixth line have an included angle therebetween that is greater than zero; wherein the content of the first and second substances,
a plane perpendicular to the central axis of the centrifugal impeller is a first plane;
the intersection point of the central axis of the centrifugal impeller and the first plane is a first intersection point;
the projection of the third end 303 on the first plane is a third projection point;
the projection of the fourth end 304 on the first plane is a fourth projection point;
the fifth line is a connecting line of the third projection point and the first intersection point;
the sixth line is a connecting line between the fourth projection point and the first intersection point.
In some embodiments, the angle between the fifth line and the sixth line ranges from 5 ° to 12 °. That is, the third end 303 is offset from the fourth end 304 by 5 ° to 12 ° in the circumferential direction around the first intersection point.
In some embodiments, as shown in fig. 4, the entrance angle c at the leading edge 31 gradually decreases in the direction of the first wheel disc 1 to the second wheel disc 2.
Wherein the inlet angle c at the leading edge 31 is the angle between the tangent of the leading edge 31 on the profile of the blade 3 and the profile L of the blade 3.
The profile of the blade 3 is a profile produced by extending the profile L of the blade 3 to both sides of the profile L, and the profile L of the blade 3 is a line representing the shape of the blade 3 extending from the leading edge 31 to the trailing edge 32. Further, the profile L of the blade 3 is a camber line of the blade 3.
In some embodiments, the difference between the maximum inlet angle and the minimum inlet angle at the leading edge 31 is less than or equal to 18 °.
The inlet angle c at the leading edge 31 gradually decreases in the direction from the first disk 1 to the second disk 2 by not more than 18 °, which helps to improve the flow state of the air flow entering the blade and reduce the flow separation of the air flow at the inlet of the blade.
When the airflow changes from the axial direction to the radial direction under the guiding action of the blades 3, the speed of the airflow near the first wheel disc 1 is the maximum, according to the speed triangle analysis of the airflow at the blades, the inlet angle c near the front edge 31 of the first wheel disc 1 is the maximum, and the inlet angle c near the front edge 31 gradually decreases towards the second wheel disc 2, so that the purpose of the method is to meet the air inlet angles at different positions when the airflow enters the blades, and the flow separation is reduced.
Wherein the three sides of the velocity triangle are respectively the bulk velocity (tangential to the direction of blade rotation), the relative velocity (in the direction of the blade), and the absolute velocity (vector sum of the first two).
In some embodiments, as shown in fig. 4, the blade 3 comprises a plurality of profiles, a line connecting the leading edge 31 of each profile and the second intersection point O is a seventh line, a line connecting the trailing edge 32 of each profile and the second intersection point O is an eighth line, and an included angle between the seventh line and the eighth line is a wrap angle d; in wrap angles d of all profiles of the blade, the difference between the maximum wrap angle and the minimum wrap angle is less than or equal to 15 degrees; the plane where the molded surface is located is a second plane, and an intersection point of the second plane and the central axis of the centrifugal impeller is a second intersection point O.
A plurality of profiles can be made along the direction of first rim plate 1 to second rim plate 2 to blade 3, and a plurality of profiles are arranged between first rim plate 1 and second rim plate 2 by layers, and wrap angle d on each profile of blade 3 evenly passes through.
In some embodiments, the leading edge 31 is configured as a straight line.
In some embodiments, as shown in fig. 3 and 5, the trailing edge 32 is configured as an arc that is concave inward in the middle.
A plurality of profiles can be made along the direction of first rim plate 1 to second rim plate 2 to blade 3, and the cornerite d on each profile of blade 3 evenly reduces gradually earlier along the direction of first rim plate 1 to second rim plate 2, and the back is even crescent.
The connecting part of the blade 3 and the first wheel disc 1 is a first connecting surface 33, and the connecting part of the blade 3 and the second wheel disc 2 is a second connecting surface 34. The first 33 and second 34 connection faces are two of the profiles of the blade 3. The first connection surface 33 has a larger wrap angle than the second connection surface 34.
In other embodiments, as shown in fig. 6 and 7, the trailing edge 32 is configured to be linear.
The blade 3 can make a plurality of profiles along the direction of first rim plate 1 to second rim plate 2, and the cornerite d on each profile of blade 3 evenly reduces along the direction of first rim plate 1 to second rim plate 2 gradually.
In some embodiments, the thickness of the blade 3 between the leading edge 31 and the trailing edge 32 is greater than the thickness of the leading edge 31 and the thickness of the trailing edge 32 in the airflow direction. That is, the thickness of the middle portion of the vane 3 is larger than the thickness of the both side portions in the flow direction of the air current.
As shown in fig. 5 and 7, the first wheel disc 1 has an arc shape, and the first wheel disc 1 gradually bulges in a direction away from the second wheel disc 2 along a direction from the outer edge of the first wheel disc 1 to the center hole.
In some embodiments, the centrifugal impeller further satisfies the following relationship:
2×D0/(D1max+D1min)=0.9~1.1
wherein D is0Being a first wheel disc 1A radius at the inlet;
D1maxthe distance between the third end 303 of the blade 3 and the central axis of the centrifugal impeller;
D1minis the distance between the fourth end 304 of the blade 3 to the centre axis of the centrifugal impeller.
In some embodiments, the centrifugal impeller further satisfies the following relationship:
(D1max+D1min)/(D2max+D2min)=0.6~0.75
wherein D is1maxThe distance between the third end 303 of the blade 3 and the central axis of the centrifugal impeller;
D1minthe distance between the fourth end 304 of the blade 3 to the central axis of the centrifugal impeller;
D2maxthe distance between the first end 301 of the blade 3 and the central axis of the centrifugal impeller;
D2minthe distance between the second end 302 of the blade 3 to the central axis of the centrifugal impeller.
The relational expression is mainly used for limiting the length of a flow channel between adjacent blades, if the value is too large, the blades are too short, when the back pressure is large, the blades do not work enough to airflow, the content of the flow channel between the adjacent blades is easy to generate backflow, and the pneumatic performance of the fan is poor; this value is too small, the length of the blade is too long, and the frictional flow loss in the flow channel between adjacent blades is increased, which is not favorable for the aerodynamic performance of the fan.
Based on the control of each angle and size parameter of the blade 3 provided by the embodiment of the present disclosure, the airflow flow loss in the flow channel between the adjacent blades can be reduced, and the fan efficiency is improved.
In some embodiments, the blade 3 comprises an aeronautical airfoil blade, for example: NACA airfoil blades. The thickness of the blade gradually changes along the molded line direction of the blade, and the middle of the blade is thick and the two sides are thin.
With the trailing edge in this centrifugal impeller and the correlation technique that this disclosure provided for the trailing edge is the straight line, trailing edge radius position is the same, and the centrifugal impeller of trailing edge perpendicular to second rim plate compares, obtain the absolute total pressure cloud picture in the runner between the blade that is close to first rim plate 1 of centrifugal impeller through CFD numerical simulation, according to absolute total pressure cloud picture, the analysis obtains, centrifugal impeller in the correlation technique is at the blade suction surface, the centrifugal impeller that the comparison fan total pressure loss region obviously is greater than this disclosure provides, the centrifugal turbine that this disclosure provided can reduce the flow loss in the runner between the partial blade that is close to first rim plate 1, thereby promote fan efficiency.
Some embodiments provide a centrifugal fan comprising a centrifugal impeller according to any of the above embodiments.
In some embodiments, the centrifugal fan is a volute-less centrifugal fan.
In some embodiments, the centrifugal fan is a backward centrifugal fan, which is an induced draft fan.
Some embodiments provide a refrigeration device comprising a centrifugal fan as in any of the embodiments above.
In some embodiments, the refrigeration appliance comprises an air conditioner or refrigerator, or the like.
In the description of the present invention, it should be understood that the terms "first", "second", "third", etc. are used to define the components, and are only used for the convenience of distinguishing the components, and if not stated otherwise, the terms have no special meaning, and thus, should not be construed as limiting the scope of the present invention.
Furthermore, the technical features of one embodiment may be combined with one or more other embodiments advantageously without explicit negatives.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the same; although the present invention has been described in detail with reference to preferred embodiments, it should be understood by those skilled in the art that: the invention can be modified or equivalent substituted for some technical features; without departing from the spirit of the present invention, it should be understood that the scope of the claims is intended to cover all such modifications and variations.

Claims (18)

1. A centrifugal impeller, comprising:
a first wheel disc (1);
the second wheel disc (2) and the first wheel disc (1) are arranged at intervals along the axial direction of the centrifugal impeller; and
-a blade (3) connected between the first disc (1) and the second disc (2), the blade (3) comprising a leading edge (31) and a trailing edge (32) in the direction of the airflow; the connecting part of the tail edge (32) and the first wheel disc (1) is a first end (301), the connecting part of the tail edge (32) and the second wheel disc (2) is a second end (302), and the first end (301) is far away from the central axis of the centrifugal impeller relative to the second end (302).
2. A centrifugal impeller according to claim 1, wherein the first disk (1) is located upstream of the second disk (2) in the direction of the flow of the gas.
3. The centrifugal impeller according to claim 1, wherein the line connecting the first end (301) and the second end (302) is a first line, the angle a between the first line and the central axis of the centrifugal impeller being in the range of 10 ° < a <20 °.
4. The centrifugal impeller of claim 1, wherein the second line and the third line have an included angle therebetween greater than zero; wherein the content of the first and second substances,
a plane perpendicular to the central axis of the centrifugal impeller is a first plane;
the intersection point of the central axis of the centrifugal impeller and the first plane is a first intersection point;
the projection of the first end (301) on the first plane is a first projection point;
the projection of the second end (302) on the first plane is a second projection point;
the second line is a connecting line between the first projection point and the first intersection point;
the third line is a connecting line between the second projection point and the first intersection point.
5. The centrifugal impeller according to claim 1, wherein the location where the leading edge (31) is connected to the first disk (1) is a third end (303), and the location where the leading edge (31) is connected to the second disk (2) is a fourth end (304), the third end (303) being remote from the central axis of the centrifugal impeller with respect to the fourth end (304).
6. The centrifugal impeller according to claim 5, wherein the line connecting the third end (303) and the fourth end (304) is a fourth line, the angle b between the fourth line and the central axis of the centrifugal impeller being in the range of 10 ° < b <20 °.
7. The centrifugal impeller of claim 5, wherein the fifth line and the sixth line have an included angle greater than zero; wherein the content of the first and second substances,
a plane perpendicular to the central axis of the centrifugal impeller is a first plane;
the intersection point of the central axis of the centrifugal impeller and the first plane is a first intersection point;
the projection of the third end (303) on the first plane is a third projection point;
a projection of the fourth end (304) on the first plane is a fourth proxel;
the fifth line is a connecting line of the third projection point and the first intersection point;
the sixth line is a connection line between the fourth projection point and the first intersection point.
8. The centrifugal impeller of claim 7, wherein the angle between said fifth line and said sixth line is in the range of 5 ° to 12 °.
9. The centrifugal impeller according to claim 1, wherein the inlet angle c at the leading edge (31) decreases gradually in the direction from the first disk (1) to the second disk (2);
wherein the inlet angle c at the leading edge (31) is the angle between the tangent of the leading edge (31) on the profile of the blade (3) and the profile of the blade (3).
10. The centrifugal impeller according to claim 9, wherein the difference between the maximum inlet angle and the minimum inlet angle at the leading edge (31) is less than or equal to 18 °.
11. A centrifugal impeller according to claim 1, characterized in that the blade (3) comprises a plurality of profiles, the leading edge (31) of each profile being connected to the second point of intersection O by a seventh line, the trailing edge (32) of each profile being connected to the second point of intersection O by an eighth line, the seventh line being angled with respect to the eighth line by a wrap angle d; in wrap angles d of all profiles of the blade, the difference between the maximum wrap angle and the minimum wrap angle is less than or equal to 15 degrees; the plane where the molded surface is located is a second plane, and the intersection point of the second plane and the central axis of the centrifugal impeller is a second intersection point O.
12. The centrifugal impeller as claimed in claim 1, characterized in that the thickness of the blade (3) in the flow direction between the leading edge (31) and the trailing edge (32) is greater than the thickness of the leading edge (31) and the thickness of the trailing edge (32).
13. The centrifugal impeller as recited in claim 1, wherein the trailing edge (32) is configured as a straight line, or wherein the trailing edge (32) is configured as an arc line that is concave inward in the middle.
14. The centrifugal impeller according to claim 1, wherein the following relationship is satisfied:
2×D0/(D1max+D1min)=0.9~1.1
wherein D is0Is the radius at the entrance of the first wheel disc (1);
D1maxis the distance between the third end (303) of the blade (3) and the central axis of the centrifugal impeller;
D1minis the distance between the fourth end (304) of the blade (3) to the centre axis of the centrifugal impeller.
15. The centrifugal impeller according to claim 1, wherein the following relationship is satisfied:
(D1max+D1min)/(D2max+D2min)=0.6~0.75
wherein D is1maxIs the distance between the third end (303) of the blade (3) and the central axis of the centrifugal impeller;
D1minis the distance between the fourth end (304) of the blade (3) to the central axis of the centrifugal impeller;
D2maxis the distance between the first end (301) of the blade (3) and the central axis of the centrifugal impeller;
D2minis the distance between the second end (302) of the blade (3) and the central axis of the centrifugal impeller.
16. A centrifugal fan comprising a centrifugal impeller according to any one of claims 1 to 15.
17. A refrigeration apparatus comprising a centrifugal fan as claimed in claim 16.
18. The refrigeration appliance according to claim 17 wherein said refrigeration appliance is an air conditioner.
CN202022041633.0U 2020-09-17 2020-09-17 Centrifugal impeller, centrifugal fan and refrigeration equipment Active CN212479687U (en)

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