CN218177548U

CN218177548U - Centrifugal impeller, centrifugal fan and air conditioning unit

Info

Publication number: CN218177548U
Application number: CN202222779978.5U
Authority: CN
Inventors: 李亚冲; 汤雁翔; 吴健; 邹先平; 尹欧阳; 何锦峰
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2022-10-21
Filing date: 2022-10-21
Publication date: 2022-12-30
Anticipated expiration: 2032-10-21

Abstract

The disclosure provides a centrifugal impeller, a centrifugal fan and an air conditioning unit. A centrifugal impeller (1) comprises: a hub (14); the centrifugal fan blade (11) is mounted on the hub (14); the fixing ring (13) is connected to the radial outer side of the air inlet end of the centrifugal fan blade (11); and the reinforcing part (12) is connected between the centrifugal fan blade (11) and the fixing ring (13). The centrifugal fan and the air conditioning unit respectively comprise the centrifugal impeller. Based on this centrifugal impeller that openly provides, can improve the intensity of centrifugal fan blade and solid fixed ring hookup location, increase centrifugal impeller's the rotational speed that can move.

Description

Centrifugal impeller, centrifugal fan and air conditioning unit

Technical Field

The disclosure relates to the technical field of fans and air conditioning equipment, in particular to a centrifugal impeller, a centrifugal fan and an air conditioning unit.

Background

The multi-wing centrifugal fan has the characteristics of high pressure coefficient, large flow coefficient, low noise and the like, and is widely applied to cooling and ventilation in air conditioning equipment and household electrical appliance equipment. According to the materials used by the centrifugal fan blades, the centrifugal fan blades of the multi-blade centrifugal fan can be divided into two types, namely metal fan blades and non-metal fan blades. The metal fan blades have good strength and high running rotating speed, but because the metal fan blades cannot be designed in a wing shape and have higher noise, the metal fan blades are generally used in application scenes with higher requirements on the strength of the centrifugal fan blades of the multi-wing centrifugal fan, and the use of the metal fan blades means that more excellent noise indexes cannot be ensured; the nonmetal fan blade can be designed into an airfoil shape, has low noise and less flow separation, but has poor strength and lower running rotating speed.

With the increasing market competition, the noise requirements of users on products cannot be met by using metal fan blades with good strength. Therefore, the strength problem of the non-metal fan blade needs to be solved, the noise level can be ensured, the strength of the non-metal fan blade is enhanced, and the running rotating speed and the reliability of the non-metal fan blade are improved.

When the multi-wing centrifugal fan runs, the centrifugal fan blades are subjected to centrifugal force. Meanwhile, the centrifugal fan blade rotates at a high speed to accelerate the gas and change the flow direction of the gas, so that the centrifugal fan blade is subjected to larger impact force. In order to ensure the strength of the centrifugal fan blade, a fixing ring is usually designed at the outer edge of the air inlet end of the centrifugal fan blade, and the centrifugal fan blade and the fixing ring are fixed together to ensure the strength of the centrifugal fan blade at low rotation speed. But the centrifugal fan blade and the solid fixed ring joint position stress concentration, the structure is weak, and when centrifugal fan blade rotational speed was higher, easy fracture took place for nonmetal centrifugal fan blade can't be applicable to higher rotational speed.

SUMMERY OF THE UTILITY MODEL

The purpose of the present disclosure is to provide a centrifugal impeller, a centrifugal fan and an air conditioning unit, which aim to improve the connection strength between a centrifugal fan blade and a fixing ring.

A first aspect of the present disclosure provides a centrifugal impeller comprising:

a hub;

the centrifugal fan blade is arranged on the hub;

the fixing ring is connected to the radial outer side of the air inlet end of the centrifugal fan blade; and

and the reinforcing part is positioned at the air inlet end of the centrifugal fan blade and is connected between the centrifugal fan blade and the fixing ring.

In the centrifugal impeller of some embodiments,

the reinforcing part is positioned at one axial end of the fixing ring along the axial direction of the centrifugal impeller and is positioned in the extension range of the centrifugal fan blade; and/or

The reinforcing part is positioned on the outer side of the centrifugal fan blade along the radial direction of the centrifugal impeller; and/or

The reinforcing portion is located inside an outer edge of the fixed ring in a radial direction of the centrifugal impeller.

In the centrifugal impeller of some embodiments, the reinforcing part includes a side surface, and a top end and a bottom end that are located at the axial both ends of the side surface respectively, the top end is summit, topside or top surface, the bottom end is the bottom surface, the bottom surface with the laminating of the axial terminal surface of solid fixed ring is connected, the side surface include with the first side portion that centrifugal fan blade is connected.

In the centrifugal impeller of some embodiments, at least a portion of the side surface is smoothly connected to the fixing ring.

In the centrifugal impeller of some embodiments, the side face includes second and third side face portions located on opposite sides in a circumferential direction of the centrifugal impeller and a fourth side face portion facing a radially outer side of the centrifugal impeller.

In the centrifugal impeller of some embodiments,

at least one of the second side surface portion, the third side surface portion, and the fourth side surface portion is smoothly connected to the fixing ring; and/or

At least one side surface part of the second side surface part, the third side surface part and the fourth side surface part is gradually far away from the centrifugal fan blade from the top end to the bottom end; and/or

The second side surface portion and the third side surface portion are disposed symmetrically with respect to a plane passing through an axis of the centrifugal impeller; and/or

At least one of the second side surface portion, the third side surface portion, and the fourth side surface portion is a flat surface, a concave surface that is concave toward the inside of the reinforcement portion, or a convex surface that is convex toward the outside of the reinforcement portion.

In the centrifugal impeller of some embodiments,

the second side surface portion and the third side surface portion are recessed surfaces that are recessed toward the inside of the reinforcement portion, and the cross-sectional shapes of the second side surface portion and the third side surface portion on a tangential plane of the centrifugal impeller are circular arcs; and/or

The cross-sectional shape of the fourth side surface portion on the radial plane of the centrifugal impeller is a straight line.

In the centrifugal impeller of some embodiments,

the second side surface part and the third side surface part are concave surfaces which are concave towards the inside of the reinforcing part, the cross sections of the second side surface part and the third side surface part on the tangential plane of the centrifugal impeller are circular arcs, the radius b of each circular arc is between 0.45a and 0.55a, and a is the outlet width of a flow passage between two adjacent centrifugal blades.

In the centrifugal impeller of some embodiments, a length e of a first intersection line where the second side surface portion intersects with the fixing ring is equal to a length f of a second intersection line where the third side surface portion intersects with the fixing ring.

In some embodiments, a length e of a first intersection line of the second side portion and the fixing ring and a length f of a second intersection line of the third side portion and the fixing ring are 0.4 (d-c) to 0.6 (d-c), where c is an outer edge radius of the centrifugal fan blade 11 and d is an outer edge radius of the fixing ring.

In the centrifugal impeller of some embodiments,

the top end is a top edge connected with the centrifugal fan blade, and the length g of the top edge is 0.3[ (2 pi c/p) -a ] to 0.4[ (2 pi c/p) -a ]; and/or

The length h of a third intersection line of the fourth side surface part and the fixing ring is 2.5[ (2 pi c/p) -a ] to 3[ (2 pi c/p) -a ];

wherein p is the number of the centrifugal fan blades, c is the outer edge radius of the centrifugal fan blades, and a is the outlet width of a flow channel between two adjacent centrifugal fan blades.

In some embodiments, in the axial direction of the centrifugal impeller, the distance m between the top end and the bottom end of the reinforcing part is 0.05 q-0.08 q, where q is the length of the centrifugal fan blade.

In the centrifugal impeller of some embodiments, the reinforcement portion is integrally formed with the centrifugal fan blade and the fixing ring.

In some embodiments, the centrifugal impeller includes a plurality of centrifugal blades evenly distributed along a circumferential direction of the centrifugal impeller, and a plurality of reinforcing portions corresponding to the plurality of centrifugal blades one to one.

In the centrifugal impeller of some embodiments, the retaining ring is a water slinger.

A second aspect of the present disclosure provides a centrifugal fan comprising the centrifugal impeller of the first aspect of the present disclosure.

A third aspect of the present disclosure provides an air conditioning unit comprising a centrifugal impeller according to the first aspect of the present disclosure.

Based on this centrifugal impeller that openly provides, can improve the intensity of centrifugal fan blade and solid fixed ring hookup location, increase centrifugal impeller's the rotational speed that can move. When the centrifugal impeller is made of the non-metal material, the problems of weak structure and stress concentration of the connecting position of the non-metal material centrifugal impeller and the fixing ring are solved, the strength of the connecting position of the centrifugal impeller and the fixing ring is effectively improved, the running rotating speed of the non-metal material centrifugal impeller is increased, and the low noise performance of the non-metal material centrifugal impeller and the high strength performance of the metal material centrifugal impeller can be considered. The centrifugal impeller is made of the metal centrifugal fan blade, so that the connection strength between the metal centrifugal fan blade and the fixing ring can be further improved, and the operable rotating speed of the centrifugal impeller can be further improved.

Other features of the present disclosure 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 disclosure and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the disclosure and together with the description serve to explain the disclosure and not to limit the disclosure. In the drawings:

fig. 1 is a schematic structural diagram of a centrifugal fan according to an embodiment of the present disclosure.

Fig. 2 is a schematic structural view of a centrifugal impeller according to an embodiment of the present disclosure.

Fig. 3 is a schematic view showing a structure of the reinforcing portion of the centrifugal impeller shown in fig. 2 in one direction.

Fig. 4 is a schematic structural view of the reinforcing portion of the centrifugal impeller shown in fig. 2 in another direction.

Fig. 5 is a partial sectional structural view in one direction of the centrifugal impeller shown in fig. 2.

Fig. 6 is a graph showing the results of stress calculation of a centrifugal impeller without a reinforcing portion in the related art.

Fig. 7 is a graph showing the calculation results of the stress of the centrifugal impeller of the embodiment shown in fig. 2.

Detailed Description

The technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the drawings in the embodiments of the present disclosure, and it is obvious that the described embodiments are only a part of the embodiments of the present disclosure, 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 disclosure, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.

The relative arrangement of parts and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present disclosure 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 exemplary only and not as 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.

In the description of the present disclosure, it should be understood that the terms "first", "second", etc. are used to define the components, and are used only for convenience of distinguishing the corresponding components, and if not otherwise stated, the terms have no special meaning, and thus, should not be construed as limiting the scope of the present disclosure.

In the description of the present disclosure, it is to be understood that the orientation or positional relationship indicated by the directional terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc., are generally based on the orientation or positional relationship shown in the drawings, and are presented only for the convenience of describing and simplifying the disclosure, and in the absence of a contrary indication, these directional terms are not intended to indicate and imply that the device or element being referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore, should not be taken as limiting the scope of the disclosure; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.

As shown in fig. 1 to 5, the present disclosure provides a centrifugal impeller 1. The centrifugal impeller comprises a hub 14, a centrifugal fan blade 11, a fixing ring 13 and a reinforcing part 12. The centrifugal fan blade 11 is mounted on a hub 14. The fixed ring 13 is connected to the radial outer side of the air inlet end of the centrifugal fan blade 11. The reinforcing part 12 is positioned at the air inlet end of the centrifugal fan blade 11 and is connected between the centrifugal fan blade 11 and the fixing ring 13.

The centrifugal impeller 1 disclosed by the embodiment of the disclosure can improve the strength of the connecting position of the centrifugal fan blade 11 and the fixing ring 13, and increase the operable rotating speed of the centrifugal impeller 1. For example, the centrifugal impeller 1 of this embodiment may adopt the centrifugal fan blade 11 made of the non-metallic material, so as to solve the problems of weak structure and stress concentration at the connection position of the centrifugal fan blade 11 made of the non-metallic material and the fixing ring 13, effectively improve the strength at the connection position of the centrifugal fan blade 11 and the fixing ring 13, increase the operable rotating speed of the centrifugal impeller 1 having the centrifugal fan blade 11 made of the non-metallic material, and take into account the low noise performance of the centrifugal fan blade made of the non-metallic material and the high strength performance of the centrifugal fan blade made of the metallic material. Of course, the structure of the embodiment of the present disclosure may also be applied to a centrifugal impeller having a centrifugal fan blade made of a metal material, so as to further improve the connection strength between the centrifugal fan blade made of the metal material and the fixing ring 13, and further improve the operable rotation speed of the centrifugal impeller.

The structure of the reinforcing portion 12 may be various, such as a sheet, a strip, a wing, etc., and the arrangement position of the reinforcing portion 12 may also be various, such as being arranged inside and/or outside the radial direction of the fixed ring 13 along the radial direction of the centrifugal impeller 1, and being arranged inside and/or outside the range of the fixed ring 13 along the axial direction of the centrifugal impeller 1.

As shown in fig. 1, in the centrifugal impeller 1 of some embodiments, the reinforcing portion 12 is located at one axial end of the fixing ring 13 in the axial direction of the centrifugal impeller 1 and within an extending range of the centrifugal fan blade 11; and/or the reinforcing part 12 is positioned outside the centrifugal fan blade 11 along the radial direction of the centrifugal impeller 1; and/or the reinforcement portion 12 is located inside the outer edge of the fixed ring 13 in the radial direction of the centrifugal impeller 1.

The above arrangements are all advantageous to limit the reinforcement part 12 within the overall size of the centrifugal impeller 1, so that the overall size of the centrifugal impeller 1 is not additionally increased and/or the operation of the centrifugal fan blade 11 is not relatively less affected.

In the embodiment shown in fig. 1 to 5, the reinforcing portion 12 is located at one end of the fixing ring 13 on the axial inner side, and is located on the outer side of the centrifugal fan blade 11 and on the inner side of the outer edge of the fixing ring 13 in the radial direction of the centrifugal impeller 1.

As shown in fig. 1 to 5, in the centrifugal impeller 1 of some embodiments, the reinforcing portion 12 includes a side surface, and a top end and a bottom end respectively located at two axial ends of the side surface, the top end is a vertex, a top edge 120A or a top surface, the bottom end is a bottom surface 121, the bottom surface 121 is attached to and connected to an axial end surface of the fixing ring 13, and the side surface includes a first side surface portion 123 connected to the centrifugal fan blade 11.

The arrangement of the reinforcing part is beneficial to larger connecting area of the reinforcing part 12, the centrifugal fan blade 11 and the fixing ring 13, so that the reinforcing part is beneficial to reinforcing the connecting strength between the centrifugal fan blade 11 and the fixing ring 13.

In the embodiment shown in fig. 1 to 5, the top end of the reinforcing portion 12 is a top edge 120A, and the top edge 120A is attached to the centrifugal fan blade 11.

As shown in fig. 1 to 5, in the centrifugal impeller 1 of some embodiments, at least a part of the side surface is smoothly connected to the fixing ring 13.

At least part of the side surface is smoothly connected with the fixing ring 13, which is beneficial to reducing the stress concentration problem between the strengthening part 12 and the fixing ring 13 and preventing the connecting part of the centrifugal fan blade 11 and the fixing ring 13 from being broken.

As shown in fig. 1 to 5, in the centrifugal impeller 1 of some embodiments, the side faces include a second side face portion 122 and a third side face portion 124 which are located on opposite sides in the circumferential direction of the centrifugal impeller 1, and a fourth side face portion 125 which faces the radially outer side of the centrifugal impeller 1.

As shown in fig. 1 to 5, in the centrifugal impeller 1 of some embodiments, at least one of the second side surface part 122, the third side surface part 124, and the fourth side surface part 125 is smoothly connected to the fixing ring 13; and/or at least one side surface of the second side surface 122, the third side surface 124 and the fourth side surface 125 gradually gets away from the centrifugal fan blade 11 from the top end to the bottom end; and/or the second side portion 122 and the third side portion 124 are arranged symmetrically with respect to a plane passing through the axis of the centrifugal impeller 1; and/or at least one of the second side surface portion 122, the third side surface portion 124, and the fourth side surface portion 125 is a plane, a concave surface that is concave toward the inside of the reinforcement portion 12, or a convex surface that is convex toward the outside of the reinforcement portion 12.

At least one of the second side surface 122, the third side surface 124 and the fourth side surface 125 is smoothly connected to the fixing ring 13, which is favorable for reducing the stress concentration between the reinforcing part 12 and the fixing ring 13.

At least one side face portion of the second side face portion 122, the third side face portion 124 and the fourth side face portion 125 is gradually away from the centrifugal fan blade 11 from the top end to the bottom end, so that on the basis of ensuring that the connection strength between the centrifugal fan blade 11 and the fixing ring 13 is increased, the disturbance of the reinforcing portion 12 on the air flow is reduced, and the performance influence of the centrifugal fan blade 11 is reduced.

The second side surface portion 122 and the third side surface portion 124 are symmetrically arranged relative to a plane passing through the axis of the centrifugal impeller 1, so that the reinforcing portion 12 has a relatively balanced reinforcing effect on the two circumferential sides of the centrifugal fan blade 11, and the performance of the two sides of the centrifugal fan blade 11 is less affected and balanced.

At least one of the second side surface portion 122, the third side surface portion 124, and the fourth side surface portion 125 is a flat surface, a concave surface that is concave toward the inside of the reinforcement portion 12, or a convex surface that is convex toward the outside of the reinforcement portion 12, which facilitates flexible arrangement of the reinforcement portion 12 and reduction of disturbance to the air flow, thereby facilitating reduction of the influence of the arrangement of the reinforcement portion 12 on the performance of the centrifugal impeller 12.

As shown in fig. 1 to 5, in the centrifugal impeller 1 of some embodiments, the second side surface portion 122 and the third side surface portion 124 are concave surfaces that are concave toward the inside of the reinforcing portion 12, and the sectional shapes of the second side surface portion 122 and the third side surface portion 124 on the tangential plane of the centrifugal impeller 1 are circular arcs; and/or the fourth side surface portion 125 has a straight line shape in a cross-sectional shape on a radial plane of the centrifugal impeller.

The arrangement enables the structure of the reinforcing part 12 to form hard fins similar to the wing shape of a ray, so that the reinforcing part 12 can effectively strengthen the connecting part of the centrifugal fan blade 11 and the fixing ring 13. In addition, the reinforcing portion 12 disturbs the flow of the air stream more than necessary, thereby having a smaller influence on the flow performance of the centrifugal impeller 1.

As shown in fig. 1 to 5, in the centrifugal impeller 1 of some embodiments, the second side surface portion 122 and the third side surface portion 124 are concave surfaces that are concave toward the inside of the reinforcing portion 12, and the cross-sectional shapes of the second side surface portion 122 and the third side surface portion 124 on the tangential plane of the centrifugal impeller 1 are circular arcs, and the radius b of the circular arcs is between 0.45a and 0.55a, where a is the outlet width of the flow passage between two adjacent centrifugal blades 11.

The value of the radius b is reasonably set, so that the influence on the flow area of a flow channel between adjacent centrifugal fan blades 11 is reduced while the strength of the centrifugal fan blades 11 is reasonably improved, and the adverse influence on the air volume caused by the arrangement of the reinforcing part 12 is reduced.

As shown in fig. 1 to 5, in the centrifugal impeller 1 of some embodiments, a length e of a first intersection line 120B where the second side surface portion 122 intersects with the fixed ring 13 is equal to a length f of a second intersection line 120D where the third side surface portion 124 intersects with the fixed ring 13.

The length e is equal to the length f, so that the reinforcing part 12 has a relatively balanced reinforcing effect on the two circumferential sides of the centrifugal fan blade 11, and the performance of the two sides of the centrifugal fan blade 11 is less affected and balanced.

As shown in fig. 1 to 5, in the centrifugal impeller 1 of some embodiments, a length e of a first intersecting line 120B where the second side surface portion 122 intersects with the fixing ring 13 and a length f of a second intersecting line 120D where the third side surface portion 124 intersects with the fixing ring 13 are 0.4 (D-c) to 0.6 (D-c), where c is an outer edge radius of the centrifugal fan 1111 and D is an outer edge radius of the fixing ring 13.

The length e and the length f are reasonably set, so that the connection strength of the centrifugal fan blade 11 and the fixing ring 13 is effectively strengthened by the strengthening part 12, and meanwhile, the air flow disturbance of the strengthening part 12 to the centrifugal impeller 1 is reduced.

In the centrifugal impeller 1 of some embodiments, the top end is a top edge 120A connected with the centrifugal fan blade 11, and the length g of the top edge 120A is 0.3[ (2 pi c/p) -a ] to 0.4[ (2 pi c/p) -a ]; and/or the length h of the third intersection line 120C between the fourth side surface 125 and the fixing ring 13 is 2.5[ (2 π C/p) -a ] to 3[ (2 π C/p) -a ]; wherein p is the number of the centrifugal fan blades 11, c is the outer edge radius of the centrifugal fan blades 11, and a is the outlet width of the flow channel between two adjacent centrifugal fan blades 11.

The length g and/or the length h are/is reasonably set, so that the connection strength of the centrifugal fan blade 11 and the fixing ring 13 is effectively strengthened by the strengthening part 12, and meanwhile, the airflow disturbance of the strengthening part 12 to the centrifugal impeller 1 is reduced.

In the centrifugal impeller 1 of some embodiments, the distance m between the top end and the bottom end of the reinforcing part 12 along the axial direction of the centrifugal impeller 1 is 0.05q to 0.08q, wherein q is the length of the centrifugal fan blade 11.

The distance m is reasonably set, so that the connection strength of the centrifugal fan blade 11 and the fixing ring 13 is effectively strengthened by the strengthening part 12, and meanwhile, the airflow disturbance of the strengthening part 12 to the centrifugal impeller 1 is reduced.

In the centrifugal impeller 1 of some embodiments, the reinforcement 12 is integrally formed with the centrifugal fan blade 11 and the fixing ring 13.

The reinforcing part 12, the centrifugal fan blade 11 and the fixing ring 13 are integrally formed, so that the processing and manufacturing processes of the centrifugal impeller 1 are simplified, and the reinforcing effect of the reinforcing part 12 on the connecting part of the centrifugal fan blade and the fixing ring 13 is further improved.

As shown in fig. 1 to 5, in the centrifugal impeller 1 of some embodiments, the centrifugal impeller 1 includes a plurality of centrifugal blades 11 uniformly distributed along a circumferential direction of the centrifugal impeller 1, and a plurality of reinforcing portions 12 corresponding to the plurality of centrifugal blades 11 one to one.

In some embodiments of the centrifugal impeller 1, the retaining ring 13 is a water ring.

When the fixing ring 13 is a water ring, the reinforcing part 12 can also play a role of water beating.

The embodiment of the present disclosure further provides a centrifugal fan, which includes the centrifugal impeller 1 of the embodiment of the present disclosure.

The centrifugal fan of the embodiment of the present disclosure has the advantages of the centrifugal impeller 1 of the embodiment of the present disclosure.

The embodiment of the disclosure also provides an air conditioning unit, which comprises the centrifugal impeller 1 of the embodiment of the disclosure.

The air conditioning unit of the embodiment of the present disclosure has the advantages of the centrifugal impeller 1 of the embodiment of the present disclosure.

The centrifugal fan and the centrifugal impeller 1 of the embodiment of the present disclosure are further described below with reference to fig. 1 to 5.

As shown in fig. 1, the centrifugal fan includes a scroll casing 3, a centrifugal impeller 1 disposed in the scroll casing 3, and a motor 2 for driving the centrifugal impeller 1 to rotate. The centrifugal impeller 1 is connected with the motor 2 through a bolt and then fixed on the volute 3 through a bolt.

As shown in fig. 2 to 5, the centrifugal impeller 1 includes a hub 14, a plurality of centrifugal blades 11 uniformly disposed on the hub 14 along a circumferential direction of the hub 14, a fixing ring 13 connected to a radial outer side of an inlet section of the plurality of centrifugal blades 11, and reinforcing portions 12 disposed in one-to-one correspondence with the plurality of centrifugal blades 11, wherein the reinforcing portions 12 are respectively connected to a radial outer side of the corresponding centrifugal blade 11 and an axial inner end of the fixing ring 13.

The centrifugal fan blade 11 is made of non-metal materials. The reinforcing part 12, the centrifugal fan blade 11 and the fixing ring 13 are integrally formed in an injection molding mode.

The fixing ring 13 is a water beating ring.

The reinforcing part 12 is a pentahedron including four side parts and a bottom surface 121. The four side face parts include a first side face part 123, a second side face part 122, a third side face part 124, and a fourth side face part 125. The intersection line between the first side surface portion 123 and the fourth side surface portion 125 constitutes the top edge 120A of the reinforcing portion 12. The first side face part 123 is connected with the centrifugal fan blade 11; the end face 121 is connected to the axially inner end face of the fixed ring 13. The top edge 120A is positioned on the centrifugal fan blade 11.

As shown in fig. 4, except for the top edge 120, the second side portion 122 intersects the fixing ring 13 at a first intersection line 120B, the third side portion 124 intersects the fixing ring 13 at a second intersection line 120D, and the fourth side portion 125 intersects the fixing ring 13 at a third intersection line 120C.

As shown in fig. 3, the second side surface portion 122 and the third side surface portion 124 are concave surfaces that are concave toward the inside of the reinforcing portion 12, and the cross-sectional shapes of the second side surface portion 122 and the third side surface portion 124 on the tangential plane of the centrifugal impeller 1 are circular arcs. The radius of the circular arc b =0.5a. Wherein a is the outlet width of the flow channel between two adjacent centrifugal blades 11.

As shown in fig. 4, in the centrifugal impeller 1 of some embodiments, a length e of a first intersection line 120B where the second side surface portion 122 intersects with the fixed ring 13 is equal to a length f of a second intersection line 120D where the third side surface portion 124 intersects with the fixed ring 13. The length e and the length f are 0.5 (d-c). Wherein c is the outer edge radius of the centrifugal fan blade 1111, and d is the outer edge radius of the fixing ring 13.

As shown in FIG. 4, the length g of top edge 120A is 0.35[ (2 π c/p) -a ]. Wherein p is the number of the centrifugal fan blades 11, c is the outer edge radius of the centrifugal fan blades 11, and a is the outlet width of the flow channel between two adjacent centrifugal fan blades 11. The length g represents the length of the contact part of the reinforcing part 12 and the fan blade 11.

As shown in FIG. 4, the length h of the third intersection line 120C of the fourth side portion 125 and the fixing ring 13 is 2.75[ (2 π C/p) -a ]. Wherein p is the number of the centrifugal fan blades 11, c is the outer edge radius of the centrifugal fan blades 11, and a is the outlet width of the flow channel between two adjacent centrifugal fan blades 11. The length h represents the length of the portion of the reinforcement portion 12 that contacts the fixing ring 13.

As shown in fig. 5, the cross-sectional shape of the fourth side surface portion 125 on the radial plane of the centrifugal impeller is a straight line.

As shown in fig. 5, the distance m between the top end and the bottom end of the reinforcing part 12 along the axial direction of the centrifugal impeller 1 is 0.05 q-0.08 q, where q is the length of the centrifugal fan blade 11. For example, m =0.07q. Where m represents the length of the reinforcement 12 in the length direction of the centrifugal fan blade 11.

As shown in fig. 5, the length n of the position where the reinforcing portion 12 is connected to the fixed ring 13 in the radial direction of the centrifugal impeller 1 is the same as the aforementioned length e and length f.

In the centrifugal fan and the centrifugal impeller 1 thereof according to the embodiment of the present disclosure, the reinforcing part 12 of the centrifugal impeller 1 is similar to a ray wing, thereby providing the centrifugal impeller 1 having the ray-type bionic reinforcing part 12. In the centrifugal impeller 1 disclosed herein, after the reinforcing part 12 is adopted, the problems of weak structure and stress concentration at the connecting position of the centrifugal fan blade 11 and the fixing ring 13 are solved, the strength of the centrifugal fan blade 11 made of a non-metal material is improved, and the operable rotating speed of the centrifugal impeller 1 with the centrifugal fan blade 11 made of the non-metal material is effectively improved.

As shown in fig. 6 to 7, compared to the related art, after the reinforcing portion is added to the centrifugal impeller 12 of the centrifugal fan blade 11 made of the non-metallic material, when the rotating speed is the same, the stress value of the connecting position of the centrifugal fan blade 11 and the fixing ring 13 is reduced by 41.5%, and the maximum operable rotating speed of the centrifugal fan blade 11 is increased by 30.5%. The embodiment of the present disclosure has a relatively obvious effect on improving the strength and the rotating speed of the centrifugal impeller 1 of the centrifugal fan blade 11 and the centrifugal fan with the non-metallic material.

In fig. 1 to 5, only an example of a single-inlet centrifugal impeller is shown, and the present disclosure is equally applicable to a double-inlet centrifugal impeller and a centrifugal fan.

Finally, it should be noted that: the above examples are intended only to illustrate the technical solutions of the present disclosure and not to limit them; although the present disclosure has been described in detail with reference to preferred embodiments, those of ordinary skill in the art will understand that: modifications to the embodiments of the present disclosure or equivalent substitutions for parts of the technical features can be made, which are intended to be covered by the technical scope of the present disclosure.

Claims

1. A centrifugal impeller (1), characterized in that it comprises:

a hub (14);

the centrifugal fan blade (11) is arranged on the hub (14);

the fixing ring (13) is connected to the radial outer side of the air inlet end of the centrifugal fan blade (11); and

and the reinforcing part (12) is positioned at the air inlet end of the centrifugal fan blade (11) and is connected between the centrifugal fan blade (11) and the fixing ring (13).

2. Centrifugal impeller (1) according to claim 1,

the reinforcing part (12) is positioned at one axial end of the fixing ring (13) along the axial direction of the centrifugal impeller (1) and is positioned in the extension range of the centrifugal fan blade (11); and/or

The reinforcing part (12) is positioned on the outer side of the centrifugal fan blade (11) along the radial direction of the centrifugal impeller (1); and/or

The reinforcement part (12) is located inside the outer edge of the fixing ring (13) in the radial direction of the centrifugal impeller (1).

3. The centrifugal impeller (1) according to claim 1, wherein the reinforcement (12) comprises a side surface and a top end and a bottom end respectively located at two axial ends of the side surface, the top end being a top point, a top edge (120A) or a top surface, the bottom end being a bottom surface (121), the bottom surface (121) being attached to and connected to an axial end surface of the fixing ring (13), the side surface comprising a first side surface portion (123) connected to the centrifugal fan blade (11).

4. The centrifugal impeller (1) according to claim 3, characterized in that at least part of the side is smoothly connected with the fixing ring (13).

5. The centrifugal impeller (1) according to claim 3, wherein the side faces include a second side face portion (122) and a third side face portion (124) located on opposite sides in a circumferential direction of the centrifugal impeller (1) and a fourth side face portion (125) facing a radially outer side of the centrifugal impeller (1).

6. Centrifugal impeller (1) according to claim 5,

at least one of the second side surface portion (122), the third side surface portion (124) and the fourth side surface portion (125) is smoothly connected to the fixing ring (13); and/or

At least one of the second side surface portion (122), the third side surface portion (124) and the fourth side surface portion (125) gradually gets away from the centrifugal fan blade (11) from the top end to the bottom end; and/or

The second side portion (122) and the third side portion (124) are arranged symmetrically with respect to a plane passing through the axis of the centrifugal impeller (1); and/or

At least one of the second side surface portion (122), the third side surface portion (124), and the fourth side surface portion (125) is a flat surface, a concave surface that is concave toward the inside of the reinforcement portion (12), or a convex surface that is convex toward the outside of the reinforcement portion (12).

7. Centrifugal impeller (1) according to claim 6,

the second side surface portion (122) and the third side surface portion (124) are concave surfaces that are concave toward the inside of the reinforcement portion (12), and the cross-sectional shapes of the second side surface portion (122) and the third side surface portion (124) on a tangential plane of the centrifugal impeller (1) are circular arcs; and/or

The cross-sectional shape of the fourth side surface portion (125) on a radial plane of the centrifugal impeller is a straight line.

8. Centrifugal impeller (1) according to any of claims 5 to 7,

the second side surface portion (122) and the third side surface portion (124) are concave surfaces which are concave towards the inside of the reinforcing portion (12), the cross sections of the second side surface portion (122) and the third side surface portion (124) on the tangential plane of the centrifugal impeller (1) are circular arcs, the radius b of each circular arc is between 0.45a and 0.55a, and a is the outlet width of a flow channel between two adjacent centrifugal fan blades (11).

9. The centrifugal impeller (1) according to any one of claims 5 to 7, characterized in that a length e of a first intersection line (120B) of the second side face portion (122) with the fixing ring (13) is equal to a length f of a second intersection line (120D) of the third side face portion (124) with the fixing ring (13).

10. The centrifugal impeller (1) according to claim 9, characterized in that the length e of a first intersection line (120B) of the second side face (122) with the fixed ring (13) and the length f of a second intersection line (120D) of the third side face (124) with the fixed ring (13) are 0.4 (D-c) to 0.6 (D-c), where c is the outer edge radius of the centrifugal fan blade (11) and D is the outer edge radius of the fixed ring (13).

11. Centrifugal impeller (1) according to any of claims 5 to 7,

the top end is a top edge (120A) connected with the centrifugal fan blade (11), and the length g of the top edge (120A) is 0.3[ (2 pi c/p) -a ] -0.4 [ (2 pi c/p) -a ]; and/or

The length h of a third intersection line (120C) between the fourth side surface part (125) and the fixing ring (13) is 2.5[ (2 pi C/p) -a ] to 3[ (2 pi C/p) -a ];

wherein p is the number of the centrifugal fan blades (11), c is the outer edge radius of the centrifugal fan blades (11), and a is the outlet width of a flow channel between two adjacent centrifugal fan blades (11).

12. The centrifugal impeller (1) according to any one of claims 3 to 7, wherein the distance m between the top end and the bottom end of the reinforcement (12) in the axial direction of the centrifugal impeller (1) is 0.05q to 0.08q, where q is the length of the centrifugal fan blade (11).

13. The centrifugal impeller (1) according to any one of claims 1 to 7, characterized in that the reinforcement (12) is integrally formed with the centrifugal fan blade (11) and the fixing ring (13).

14. The centrifugal impeller (1) according to any one of claims 1 to 7, wherein the centrifugal impeller (1) comprises a plurality of said centrifugal blades (11) uniformly distributed circumferentially along the centrifugal impeller (1) and a plurality of said reinforcing portions (12) in one-to-one correspondence with said plurality of centrifugal blades (11).

15. Centrifugal impeller (1) according to any of the claims 1 to 7, wherein the fixing ring (13) is a water ring.

16. A centrifugal fan, characterized in that it comprises a centrifugal impeller (1) according to any one of claims 1 to 15.

17. Air conditioning assembly, characterized in that it comprises a centrifugal impeller (1) according to any one of claims 1 to 15.