CN218862923U

CN218862923U - Impeller and fan

Info

Publication number: CN218862923U
Application number: CN202223596598.4U
Authority: CN
Inventors: 刘华; 池晓龙; 刘煜; 王奇; 夏凯
Original assignee: Gree Electric Appliances Inc of Zhuhai
Current assignee: Gree Electric Appliances Inc of Zhuhai
Priority date: 2022-12-28
Filing date: 2022-12-28
Publication date: 2023-04-14
Anticipated expiration: 2032-12-28

Abstract

The utility model discloses an impeller and fan, wherein, the impeller includes: the fan blade comprises an upper movable blade and a lower movable blade, and the blades of the upper movable blade and the blades of the lower movable blade are connected and matched to form a complete fan blade; the upper movable blade is provided with a matching structure in driving connection with a motor shaft, the upper movable blade is provided with a blade front edge, and the upper movable blade is in transmission connection with the lower movable blade; the wheel cover and the upper movable blade are of an integrated structure. The utility model discloses an impeller and fan have solved among the prior art problem that the fan assembly leads to the axiality location operation of blade intensity difference, fan blade and wheel cap complicated, movable blade shake increase unbalance amount when rotatory effectively.

Description

Impeller and fan

Technical Field

The utility model relates to a fan technical field particularly, relates to an impeller and fan.

Background

In the assembly of impellers in a traditional centrifugal fan and a traditional mixed flow fan, the largest blade tip of a fan blade and a wheel cover are welded together in the prior art, but the scheme is unfavorable for the fan with a small blade outlet inclination angle (the inclination angle is the included angle between the central line of the fan blade outlet and the axial direction of inlet air), a long chord length of the movable blade and a long inlet air front edge of the blade. Because the blade edge is comparatively perpendicular, ultrasonic bonding is difficult, does not weld basically, leaves the clearance between blade and the wheel lid, produces unusual tone quality easily, leads to the blade intensity relatively poor.

The traditional technology is to ensure the precision by using the assembling and combining, generally, the coaxiality is ensured by positioning two welding heads during welding, and the coaxiality positioning operation of the fan blade and the wheel cover is complex in the traditional technology. The unbalance may be increased if the bucket shakes while rotating due to welding or the bucket shakes while rotating due to an inaccurate welding position.

In summary, in the prior art, the fan assembly causes poor blade strength, complex coaxiality positioning operation of the fan blade and the wheel cover, and the vibration of the movable blade increases unbalance during rotation.

SUMMERY OF THE UTILITY MODEL

The embodiment of the utility model provides an in provide an impeller and fan to solve among the prior art problem that the fan assembly leads to the axiality location operation of blade intensity difference, fan blade and wheel cap complicated, movable blade shake increase unbalance amount when rotatory.

In order to achieve the above object, the present invention provides an impeller, including: the fan blade comprises an upper movable blade and a lower movable blade, and the blades of the upper movable blade and the blades of the lower movable blade are connected and matched to form a complete fan blade; the upper movable blade is provided with a matching structure in driving connection with a motor shaft, the upper movable blade is provided with a blade front edge, and the upper movable blade is in transmission connection with the lower movable blade; the wheel cover and the upper movable blade are of an integrated structure.

Further, the wheel cap is sleeved on the periphery of the fan blade, and a gap T1 is formed between the side surface of the maximum outer diameter of the lower movable blade and the wheel cap.

Further, the gap T1 satisfies the following relationship: t1 is more than or equal to 0 and less than or equal to 2G, or T1 is more than 0 and less than or equal to 0.5G; g is the maximum thickness of the blade.

Further, the method also comprises the following steps: the wheel hub, wheel hub and lower movable vane structure as an organic whole.

Further, the upper bucket and the lower bucket have the following three points at the blade fitting: and (B) point A: the maximum outer diameter position of the fan blade is away from the front edge of the fan blade by a distance H1 to form a first horizontal plane, the fan blade and the wheel cover are intersected to form a first curve, the intersection point of the first horizontal plane and the first curve is a point A, H1 is more than or equal to 1G and less than or equal to M2, M2 is the total height of the part, connected with the wheel cover, of the fan blade, and G is the maximum thickness of the fan blade; and B, point: the distance H2 from the highest point of the front edge of the fan blade to the direction of the downward moving blade is taken as a second horizontal plane, a second curve is intersected with the hub, the intersection point of the second horizontal plane and the second curve is a point B, H2 is more than or equal to 1G and less than or equal to M1, and M1 is the total height of the part, connected with the hub, of the fan blade; and C, point: the point C is positioned between the point A and the point B, the point A, the point B and the point C form a triangle, and the projection of the point A, the point B and the point C on the cross section of the fan blade is not collinear; an included angle between the AC connecting line and the cross section of the impeller is M, an included angle between the BC connecting line and the axis of the impeller is K, and the cross section of the impeller is vertical to the axis of the impeller; k is more than or equal to M.

Furthermore, a driving shaft facing the lower movable blade is arranged on the upper movable blade, a matching hole connected with a motor shaft is formed in the driving shaft, and a driving pin connected with the motor shaft in a driving mode is arranged on the driving shaft; the lower movable blade is provided with an assembly hole, and the driving shaft penetrates through the assembly hole; the motor shaft simultaneously penetrates through the matching hole and the assembling hole.

Further, a first driving piece is arranged on the upper movable blade and is positioned at the position of the driving shaft; the lower movable blade is provided with a second driving piece, and the first driving piece is in transmission connection with the second driving piece.

Furthermore, the first driving part is of a convex structure, and the second driving part is of a groove structure; or the first driving piece is of a groove structure, and the second driving piece is of a protrusion structure.

Furthermore, be provided with on the drive shaft and end a groove, be provided with on the movable vane down and end a arch, end a groove and end protruding joint cooperation in a position.

Further, the stop slot is positioned at the end part of the driving shaft, and the end part of the driving shaft passes through the assembly hole; the stop bulge is positioned on one side of the assembly hole, which is deviated from the upper movable blade.

Furthermore, end the position arch and be a plurality of, a plurality of end protruding interval settings in the position, two adjacent end are provided with supplementary muscle between protruding.

Furthermore, the upper movable blade is provided with a positioning hole, the lower movable blade is provided with a positioning column, and the positioning column is inserted into the positioning hole to form positioning fit; or the upper movable blade is provided with a positioning column, the lower movable blade is provided with a positioning hole, and the positioning column is inserted into the positioning hole to form positioning fit.

Further, the upper and lower buckets are provided with a gap T at the blade fitting.

Further, the gap T satisfies the following formula: t is more than or equal to 0.03G and less than or equal to 1G, or T is more than or equal to 0 and less than or equal to 2G, or T is more than 0 and less than or equal to 0.5G; g is the maximum thickness of the blade.

Further, the upper movable blade and/or the lower movable blade are/is provided with a plurality of salient points at the blade matching position, and all the salient points are arranged at intervals.

Further, the height value of the salient points is between 0.01G and 0.5G, and G is the maximum thickness of the blade.

Further, the upper movable blade and the lower movable blade are in fit connection at the blade fitting position through adhesion.

According to another aspect of the present invention, there is provided a fan comprising the above-mentioned impeller.

Further, the fan is a centrifugal fan or a mixed flow fan.

In the scheme of the prior art, the edges of the blades are vertical, ultrasonic welding is difficult, welding is not basically performed, a gap is reserved between the blades and the wheel cover, abnormal tone quality is easily generated, and the strength of the blades is poor. In order to overcome the problems of the prior art, the utility model discloses well wheel cap becomes an organic whole structure with last movable blade integrated into one piece. Compared with the prior art, the wheel cover and the upper movable blade are integrated, the upper movable blade and the wheel cover can be integrally formed during manufacturing, the manufacturing precision and the overall strength of the front edge angle of the fan blade can be improved, the air inlet shaking of the fan blade is reduced, and the noise is improved.

Further, because the holistic structural configuration of fan blade is complicated, can't be together with the wheel cap die sinking, so the utility model discloses divide into movable blade and lower movable blade two parts to the fan blade, go up the movable blade and can adopt from top to bottom the demolding mode to reduce the action stroke of loosing core, reduce and lead to blade shape accuracy error because of the mechanism action of loosing core, the part precision of fan blade has been higher, can reduce the precision when the assembly and improve the process, has simplified assembly process degree greatly, and assembly process is simpler. Simultaneously, after the wheel cap and the last movable vane integrated into one piece become the integral structure, the wheel cap further makes the terminal intensity of blade of going up the movable vane obtain the reinforcing, has compensatied the long terminal low not enough that leads to of blade cantilever of going up the movable vane, has promoted blade intensity effectively.

In addition, as the matching structure of the motor shaft and the motor shaft is arranged on one part (an upper movable blade), the coaxiality of the motor and the fan blade is better matched, and the assembly is not difficult (in the traditional technology, the accuracy is ensured by using the assembling combination, the coaxiality is generally ensured by positioning two welding heads during welding, and the coaxiality positioning operation of the fan blade and the wheel cover is complex in the traditional technology). And the last movable vane in this scheme and motor shaft drive cooperation, go up movable vane and lower movable vane and assemble the cooperation again, go up the movable vane because the wheel lid quality is big, its quality accounts for higher part and axle cooperation on general, multiple factor influences jointly, can improve the movable vane unbalance amount (if the movable vane shakes when leading to the rotation because the welding, or the movable vane shakes when leading to the rotation because the welding position is inaccurate, can increase the unbalance amount).

The upper movable blade and the wheel cover are integrated to realize the integration of the front edge of the blade, the strength is high, and the precision can be ensured; the problems that the air inlet angle is fluctuated, the blades are shaken, high-speed airflow flows through gaps, the axis is not correct, the dynamic balance adjustment difficulty is increased and the like caused by a welding scheme in the prior art are solved.

Drawings

Fig. 1 is a schematic structural view of an impeller according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of an upper movable blade and a wheel cover of an impeller according to an embodiment of the present invention;

FIG. 3 is a structural schematic view of another orientation of the upper bucket and shroud of FIG. 2;

FIG. 4 is an enlarged view at F1 of FIG. 3;

FIG. 5 is an enlarged view at F2 of FIG. 3;

fig. 6 is a schematic structural view of a lower movable blade and a hub of an impeller according to an embodiment of the present invention;

FIG. 7 is a structural schematic view of another orientation of the lower bucket and hub of FIG. 6;

fig. 8 is an enlarged view at F3 of fig. 7;

fig. 9 is a schematic view of the structural cooperation between the driving shaft of the impeller and the lower movable blade according to the embodiment of the present invention;

fig. 10 is a schematic view of the structural cooperation between the lower movable blade and the shroud of the impeller according to the embodiment of the present invention;

fig. 11 is an enlarged view at F4 of fig. 10;

fig. 12 is a schematic view of a partial structure of a motor according to an embodiment of the present invention;

fig. 13 is an exploded view of a part of the motor according to the embodiment of the present invention;

fig. 14 is a measured spectrum diagram of the impeller according to the embodiment of the present invention.

Detailed Description

The present invention will be described in further detail with reference to the following drawings and specific examples, which should not be construed as limiting the invention.

Referring to fig. 1 to 11, according to an embodiment of the present invention, there is provided an impeller, which includes a fan blade and a wheel cover 30, the fan blade includes an upper movable blade 10 and a lower movable blade 20, and the blades of the upper movable blade 10 and the lower movable blade 20 are connected and matched to form a complete fan blade; the upper movable blade 10 is provided with a matching structure in driving connection with a motor shaft, the upper movable blade 10 is provided with a fan blade front edge 11, and the upper movable blade 10 is in transmission connection with the lower movable blade 20; the shroud 30 is integrally formed with the upper rotor blade 10. The fan blade is composed of a plurality of blades and is divided into an upper movable blade and a lower movable blade. The upper movable blade comprises the upper parts of a plurality of blades, and the upper movable blade is provided with a blade front edge, namely the upper movable blade is a blade structure on the air inlet side of the blade. The lower bucket includes a lower portion of the plurality of blades, and the lower bucket is located downstream of the upper bucket in the direction of the airflow. The upper movable blade and the lower movable blade are two independent structures and are respectively produced during production and manufacturing. After the blades of the upper movable blade and the lower movable blade are connected and matched, a complete structure with a plurality of blades, namely the fan blade, is formed in a combined mode. The shroud 30 is integrally formed with the upper rotor blade 10 as an integral structure.

In the scheme of the prior art, the edges of the blades are vertical, ultrasonic welding is difficult, basically no welding is performed, gaps are reserved between the blades and the wheel cover, abnormal tone quality is easy to generate, and the strength of the blades is poor. To overcome the problems of the prior art, the middle wheel cover 30 and the upper movable blade 10 are integrally formed as a single structure. Compared with the prior art that the wheel cover 30 and the upper movable blade 10 are integrated, the upper movable blade and the wheel cover are integrated into a whole, and can be integrally formed during manufacturing.

Further, because the holistic structural shape of fan blade is complicated, can't be together the die sinking with the wheel cap, so the utility model discloses divide into movable blade and lower movable blade two parts to the fan blade, go up movable blade and can adopt from top to bottom the demolding mode to reduce the action stroke of loosing core, reduce because of the mechanism action of loosing core leads to blade shape accuracy error, the part precision of fan blade has been higher, can reduce the precision when the assembly and improve the process, has simplified assembly process degree greatly, and assembly process is simpler. Meanwhile, after the wheel cover 30 and the upper movable blade 10 are integrally formed into an integral structure, the wheel cover further enhances the strength of the tail end of the upper movable blade, overcomes the defect that the strength of the tail end is low due to the long cantilever of the upper movable blade, and effectively improves the strength of the blade.

Preferably, as shown in fig. 11, the wheel cover 30 is sleeved on the periphery of the fan blade, and a gap T1 is formed between the side surface of the maximum outer diameter of the lower movable blade 20 and the wheel cover 30. The matching surface of the blade matching part of the upper movable blade is wrapped on the local part of one surface of the lower movable blade to form a sealing surface opposite to the rotation direction of the impeller. The clearance T1 is arranged, so that the lower movable blade and the wheel cover can be prevented from interfering under the condition of thermal expansion and cold contraction, and the damage of parts caused by deformation is avoided.

Because the blades of the fan blade are curved surfaces with certain angles, the height difference corresponding to the matching points can be formed, and because the curved surfaces and the height difference exist, and the clearance between the blades and the matching surface is small, a better sealing state is formed. Whether this sealing condition is satisfied depends on the pressure difference between the vane working face and the back face, and whether internal flow loss due to the pressure difference causes performance degradation or causes abnormal noise. Therefore, when the requirement of the reliability of expansion and contraction of heat and cold of the upper movable blade and the lower movable blade is met, the T1 gap is set to be as small as possible, and the gap T1 meets the following relation: t1 is more than or equal to 0 and less than or equal to 2G, and G is the maximum thickness of the blade. Preferably, T1 is in the range 0 < T1 ≦ 0.5G.

Moreover, the hub 40 and the lower movable blade 20 are of an integral structure, namely, the integrally formed structure, so that the fan blades and the hub do not need to be subjected to pressure application for welding, brazing and the like, the assembly process is omitted, and the structural instability caused by welding and other processes is avoided, so that the overall strength of the impeller is further enhanced, and the overall reliability of the fan is improved. In addition, the hub and the lower movable blade are combined into an integral structure, the hub and the lower movable blade can be directly made into a coaxial structure in the integral forming manufacturing process, the subsequent adjustment of the coaxiality is not needed at all, and all processes of assembling the coaxial structure are completely omitted. Because movable vane and wheel hub structure as an organic whole down, and go up movable vane and lower movable vane transmission and be connected, go up the movable vane and rotate and drive down the movable vane and rotate after the motor shaft drive. The impeller can not shake due to problems of welding points and the like under high-speed rotation, and abnormal sound caused by shaking is avoided. The drive connection of the upper movable blade and the lower movable blade is ensured to have enough strength, and the fan assembly process flow is simplified.

It should be added that the traditional fan blade is long in forming and core-pulling length, that is, the core-pulling distance is long (generally longer than the air inlet front edge of the fan blade), and the shape accuracy is difficult to ensure due to the fact that the blades are thin, the longer the cantilever is, and the strength is insufficient. And the utility model discloses an go up movable blade and can adopt from top to bottom demolding mode to reduce the action stroke of loosing core, reduce and lead to blade shape accuracy error because of the mechanism action of loosing core, the part precision of fan blade is higher.

As shown in fig. 3, 5 and 12, the upper movable blade 10 is provided with a driving shaft 12 facing the lower movable blade 20, the driving shaft 12 is provided with a fitting hole 13 connected with the motor shaft, and the driving shaft 12 is provided with a driving pin 14 connected with the motor shaft in a driving manner; the lower movable blade 20 is provided with an assembly hole 21, and the driving shaft 12 penetrates through the assembly hole 21; the motor shaft is simultaneously inserted into the fitting hole 13 and the fitting hole 21. Motor shaft 71 wears to establish in mating holes 13 to with the spacing cooperation of mating holes 31, motor shaft 71 is connected with drive shaft 12 drive through driving round pin 14 simultaneously, and the motor shaft rotates in order to drive the movable vane rotation, goes up movable vane and lower movable vane drive connection, goes up movable vane and rotates simultaneously with lower movable vane like this, and then realizes the function of complete fan blade.

A first driving member 51 is arranged on the upper movable blade 10, and the first driving member 51 is positioned at the position of the driving shaft 12; the lower movable blade 20 is provided with a second driving member 52, and the first driving member 51 is in transmission connection with the second driving member 52. That is to say, the cooperation of the first driver 51 and the second driver 52 is a power transmission structure of the upper movable blade 10 and the lower movable blade 20, in this embodiment, the first driver 51 is a protrusion structure, and the second driver 52 is a groove structure; protruding structure and groove structure screens drive cooperation, upward the movable vane when rotating, through the cooperation of first driving piece and second driving piece, the movable vane carries out synchronous rotation under the drive. The position of the first driving member 51 is set at the position of the driving shaft 12, so that the driving shaft 12 is not only a power shaft matched with a motor shaft, but also can be used for transmitting torque to the lower movable blades, and the multifunctional driving device has multiple purposes. Of course, the protrusion structure and the groove structure can be interchanged, that is, the first driving member 51 is the groove structure, and the second driving member 52 is the protrusion structure, and this variation can be completely realized without any processing difficulty.

As shown in fig. 5, 7 and 9, the driving shaft 12 is provided with a stop groove 15, the lower movable blade 20 is provided with a stop protrusion 22, and the stop groove 15 is in snap fit with the stop protrusion 22. The assembly nature and the intensity of last movable vane and movable vane down have been reinforceed once more to foretell structure, have guaranteed linkage and location between the two, when drive shaft 12 wears to establish in pilot hole 21, end a groove 15 and end a protruding 22 joint cooperation, have not only realized location and spacing, can also play transmission torque's effect, make the drive shaft movable vane rotate under the drive that can be comprehensive.

Referring specifically to fig. 7, the stop slot 15 is located at the end of the drive shaft 12, the end of the drive shaft 12 passing through the assembly aperture 21; the stop protrusion 22 is located on a side of the assembly hole 21 facing away from the upper movable blade 10. The stop projection also serves as an assembly location to allow the drive shaft 12 to be attached in place after passing through the assembly aperture.

As shown in fig. 8, the number of the stop protrusions 22 is plural, the stop protrusions 22 are arranged at intervals, and an auxiliary rib 23 is arranged between two adjacent stop protrusions 22. The stop bulge and the auxiliary rib form a staggered structure, and the problem that the upper movable blade and the lower movable blade are easy to crack due to expansion with heat and contraction with cold if the upper movable blade and the lower movable blade are completely wrapped by the shaft is solved.

As shown in fig. 4 and 6, in this embodiment, the upper movable blade 10 is provided with a positioning hole 61, the lower movable blade 20 is provided with a positioning column 62, and the positioning column 62 is inserted into the positioning hole 61 to form a positioning fit. The upper movable blade and the lower movable blade are matched with each other through the positioning columns and the positioning holes in a positioning mode, the butt joint is achieved in a matched mode, the butt joint without welding is achieved, the overall strength of the fan blade cannot be excessively lost, and the fan blade is basically level to the original structure. Moreover, the whole structure of the impeller is basically equal to that of the welding structure in the prior art. The structures of the positioning columns and the positioning holes can be interchanged, that is, the positioning columns 62 are arranged on the upper movable blade 10, the positioning holes 61 are arranged on the lower movable blade 20, and the positioning columns 62 are inserted into the positioning holes 61 to form positioning fit. This structural variation is also fully applicable.

The upper movable blade and the lower movable blade are in driving limit matching formed by matching of the driving shaft and the assembling hole, matching of the first driving piece and the second driving piece, matching of the stop groove and the stop protrusion and matching of the positioning column and the positioning hole, and connection of the upper movable blade and the lower movable blade is ensured and driving force is generated.

Preferably, the upper bucket 10 and the lower bucket 20 are provided with a gap T at the blade fit, see fig. 1. The upper movable blade 10 and the lower movable blade 20 are arranged at the blade fitting position, which is the fitting position where the blades of the upper movable blade and the lower movable blade are connected (generally, the thickness surface of each blade, each blade of the plurality of blades has a corresponding thickness surface, which is the blade fitting position), and the gap T is mainly set to ensure that the two connected blades expand with heat and contract with cold and sufficient redundancy in production and manufacturing is achieved. The blade fitting surface of upper and lower movable vane and the fitting surface of movable vane and wheel cap all adopt the inclined plane cooperation down, and this design can prevent that the air current from flowing and reducing abnormal noise and taking place the risk, improves the blade and presses acting capacity.

And prevent too big clearance from causing wind to reveal, cause the performance degradation and arouse extra noise etc. clearance T satisfies following formula: t is more than or equal to 0 and less than or equal to 2G; g is the maximum thickness of the blade. Preferably, T is in the range of 0.03 G.ltoreq.T.ltoreq.1G. Preferably, the value range of T is more than 0 and less than or equal to 0.5G.

In order to further optimize the structure of the blade, the upper movable blade 10 and/or the lower movable blade 20 are provided with a plurality of salient points at the blade fitting position, and all the salient points are arranged at intervals. A plurality of small convex points can be arranged on the blades of the upper movable blade and the lower movable blade, the convex points can be respectively arranged on the upper movable blade and the lower movable blade, dense continuous convex points are formed in a staggered mode after the convex points and the convex points are assembled, and gaps are reserved between the convex points and the convex points. Or the salient points are all densely arranged on one side of the upper impeller and one side of the lower impeller. It is also conceivable to design the bumps as welding triangles, and to perform reinforcement improvement by ultrasonic welding or laser welding.

The height value of the salient points is between 0.01G and 0.5G, and G is the maximum thickness of the blade. The purpose of limiting the height of the salient points is to reduce the potential friction risk between the blades (the friction risk caused by expansion and contraction is generally the same material for the upper and lower movable blades, and the risk of expansion and contraction is lower, but the risk cannot be completely avoided and certainly can be caused).

In other embodiments not shown in the figures, the upper bucket 10 and the lower bucket 20 are joined together by gluing at the blade fitting. Can bond through scribbling engineering structure glue at the blade cooperation department of upper and lower movable vane, further strengthen part leakproofness and intensity, engineering structure glue must have certain elasticity, can not be too hard.

For the principle of splitting the fan blade into the upper movable blade and the lower movable blade, taking this embodiment as an example and describing one of the ways in conjunction with fig. 1, the upper movable blade 10 and the lower movable blade 20 have the following three points at the blade fitting position:

and (B) point A: the maximum outer diameter position of the fan blade is a first horizontal plane with a distance H1 towards the direction of the front edge 11 of the fan blade, the fan blade and the wheel cover are intersected to form a first curve, the intersection point of the first horizontal plane and the first curve is a point A, H1 is more than or equal to 1G and is less than or equal to M2, M2 is the total height of the part, connected with the wheel cover, of the fan blade, and G is the maximum thickness of the fan blade;

and B, point: the distance H2 from the highest point of the front edge of the fan blade to the direction of the downward moving blade is taken as a second horizontal plane, a second curve is intersected with the hub, the intersection point of the second horizontal plane and the second curve is a point B, H2 is more than or equal to 1G and less than or equal to M1, and M1 is the total height of the part, connected with the hub, of the fan blade;

and C, point: the point C is located between the point A and the point B, the point A, the point B and the point C are not collinear on the cross section projection of the fan blade, and the point C is located in the middle of the upper movable blade and the lower movable blade at the matching position of the blades;

an included angle between the AC connecting line and the cross section of the impeller is M, an included angle between the BC connecting line and the axis of the impeller is K, and the cross section of the impeller is perpendicular to the axis of the impeller; k is more than or equal to M.

A. The distance between the three points B and C and the front edge of the fan blade is more than or equal to 0mm and less than the chord length of the fan blade; when the relation is satisfied, the optimal size proportion and strength of the blades of the upper movable blade and the lower movable blade can be ensured.

The split fan blade has the general principle of two parts, namely, the split part can be demoulded when a mould is required, and the split part has certain strength. The general principle depends on the shape and type of the fan blade, and the considered parameters include the shape of the fan blade, the number of the fan blade, the twist degree of the fan blade, the heights of the long and short fan blades, the bending degree of the fan blade flow channel and the like. The utility model discloses do not do specific structure to the split fan blade and give unnecessary details and too much restriction, as long as satisfy the structure the same and satisfy above-mentioned universe principle, all belong to the utility model discloses an and the scope of protection.

Fig. 14 shows a measured spectrum diagram of the impeller of the present embodiment, and it is obvious that the impeller of the present embodiment has no abnormal noise, and excellent operation sound quality under the improvement of various structures.

Referring to fig. 12 to 13, according to an embodiment of the present invention, there is provided a fan, which includes the impeller of the above embodiment.

The fan comprises a motor 72 and a locknut 73, wherein a motor shaft 71 of the motor 72 penetrates through the matching hole and then is fixed with the upper movable blade through the locknut 73. The motor shaft 71 is drivingly connected to the upper moving blade 10 to rotate the upper moving blade.

The fan is a centrifugal fan or a mixed flow fan.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the present application. As used herein, the singular is intended to include the plural unless the context clearly dictates otherwise, and it should be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of features, steps, operations, devices, components, and/or combinations thereof.

It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the accompanying drawings are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in other sequences than those illustrated or described herein.

Of course, the above is a preferred embodiment of the present invention. It should be noted that, for a person skilled in the art, several modifications and decorations can be made without departing from the basic principle of the present invention, and these modifications and decorations are also considered to be within the scope of the present invention.

Claims

1. An impeller, comprising:

the fan blade comprises an upper movable blade (10) and a lower movable blade (20), and the blades of the upper movable blade (10) and the blades of the lower movable blade (20) are connected and matched to form a complete fan blade; the upper movable blade (10) is provided with a matching structure in driving connection with a motor shaft, the upper movable blade (10) is provided with a blade front edge (11), and the upper movable blade (10) is in transmission connection with the lower movable blade (20);

and the wheel cover (30) and the upper movable blade (10) are of an integral structure.

2. The impeller according to claim 1,

the wheel cover (30) is sleeved on the periphery of the fan blade, and a gap T1 is formed between the side surface of the maximum outer diameter of the lower movable blade (20) and the wheel cover (30).

3. The impeller according to claim 2, characterized in that the clearance T1 satisfies the following relationship:

t1 is more than or equal to 0 and less than or equal to 2G, or T1 is more than 0 and less than or equal to 0.5G;

g is the maximum thickness of the blade.

4. The impeller of claim 1, further comprising:

a hub (40), wherein the hub (40) and the lower movable blade (20) are of an integral structure.

5. The impeller according to claim 4,

the upper movable blade (10) and the lower movable blade (20) have the following three points at the blade matching position:

and (B) point A: the maximum outer diameter position of the fan blade is away from the front edge (11) of the fan blade by a distance H1 to form a first horizontal plane, a first curve is intersected with the wheel cover, the intersection point of the first horizontal plane and the first curve is a point A, H1 is larger than or equal to 1G and is smaller than or equal to M2, M2 is the total height of the part, connected with the wheel cover, of the fan blade, and G is the maximum thickness of the fan blade;

and B, point: a distance H2 from the highest point of the front edge of the fan blade to the direction of the lower movable blade is used as a second horizontal plane, a second curve is intersected with the hub, the intersection point of the second horizontal plane and the second curve is a point B, H2 is more than or equal to 1G and less than or equal to M1, and M1 is the total height of the part, connected with the hub, of the fan blade;

and C, point: the point C is located between the point A and the point B, the ABC forms a triangle, and the point A, the point B and the point C are not collinear on the cross section projection of the fan blade;

6. The impeller according to claim 1,

the upper movable blade (10) is provided with a driving shaft (12) facing the lower movable blade (20), the driving shaft (12) is provided with a matching hole (13) connected with a motor shaft, and the driving shaft (12) is provided with a driving pin (14) connected with the motor shaft in a driving way;

the lower movable blade (20) is provided with an assembly hole (21), and the driving shaft (12) penetrates through the assembly hole (21);

the motor shaft penetrates through the matching hole (13) and the assembling hole (21) simultaneously.

7. The impeller according to claim 6,

a first driving part (51) is arranged on the upper movable blade (10), and the first driving part (51) is positioned at the position of the driving shaft (12);

the lower movable blade (20) is provided with a second driving part (52), and the first driving part (51) is in transmission connection with the second driving part (52).

8. The impeller according to claim 7,

the first driving part (51) is of a convex structure, and the second driving part (52) is of a groove structure; or,

the first driving part (51) is of a groove structure, and the second driving part (52) is of a protrusion structure.

9. The impeller according to claim 6 or 7, characterized in that a stop groove (15) is provided on the drive shaft (12), a stop protrusion (22) is provided on the lower movable blade (20), and the stop groove (15) is snap-fitted with the stop protrusion (22).

10. The impeller according to claim 9,

the stop groove (15) is positioned at the end part of the driving shaft (12), and the end part of the driving shaft (12) passes through the assembly hole (21);

the stop bulge (22) is positioned on one side, departing from the upper movable blade (10), of the assembly hole (21).

11. The impeller according to claim 10, wherein the stop protrusions (22) are multiple, the stop protrusions (22) are arranged at intervals, and an auxiliary rib (23) is arranged between two adjacent stop protrusions (22).

12. The impeller according to claim 6 or 10,

the upper movable blade (10) is provided with a positioning hole (61), the lower movable blade (20) is provided with a positioning column (62), and the positioning column (62) is inserted into the positioning hole (61) to form positioning fit; or,

the upper movable blade (10) is provided with a positioning column (62), the lower movable blade (20) is provided with a positioning hole (61), and the positioning column (62) is inserted into the positioning hole (61) to form positioning fit.

13. The impeller according to claim 1,

the upper movable vane (10) and the lower movable vane (20) are provided with a gap T at the blade matching position.

14. The impeller according to claim 13, characterized in that the clearance T satisfies the following formula:

t is more than or equal to 0.03G and less than or equal to 1G, or T is more than or equal to 0 and less than or equal to 2G, or T is more than 0 and less than or equal to 0.5G;

g is the maximum thickness of the blade.

15. The impeller according to claim 13, characterized in that the upper bucket (10) and/or the lower bucket (20) are provided with a plurality of raised points at the blade engagement, all of said raised points being arranged at intervals.

16. The impeller of claim 15, wherein the raised points have a height value between 0.01G and 0.5G, G being the maximum blade thickness.

17. The impeller according to claim 1,

the upper movable vane (10) and the lower movable vane (20) are in fit connection at the vane fit position through bonding.

18. A fan comprising an impeller according to any one of claims 1 to 17.

19. The fan of claim 18 wherein the fan is a centrifugal fan or a mixed flow fan.