A multi-layer split-flow impeller for a centrifugal fan

Abstract

A multi-layer split impeller for a centrifugal fan according to the present invention, the blades are composed of at least three planar or curved surface parts, and there are transition slope sections between at least three parts; wherein the first part is connected to the second part through a first transition slope section, and the second part is connected to the third part through a second transition slope section. The second part is a part protruding from the positive pressure surface relative to the first part, and the third part is a part protruding from the negative pressure surface relative to the second part. The transition slope section is a single-stage or multi-stage inclined surface or arc surface slope section structure, wherein the slope K of the inclined surface or the curvature C of the arc surface between each transition slope section are not equal. The protruding height of the second part relative to the positive pressure surface of the first part is H, and the protruding height of the third part relative to the negative pressure surface of the second part is L, where H≥L. Due to the improvement of the impeller structure of the centrifugal fan, the problems of poor adaptability, vibration, noise, stability, low quality, low efficiency, etc. are solved, and the operating conditions performance and operating efficiency are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of fluid machinery, specifically to an impeller structure, and more specifically to a multi-layer flow-dividing impeller for a centrifugal fan. Background Art

[0002] Existing centrifugal fans generally consist of arc plates or integrally twisted and inclined blades, front (upper) covers and rear (lower) covers. When the centrifugal fan operates, the impeller will generate various vibrations, noises, etc. Moreover, the existing fan structure has a large mass, poor stability, poor aerodynamic effects inside the impeller, and a large gas leakage volume, which affects the efficiency of life and production. Through the design of the impeller structure, the safe operation of the unit can be ensured and the operation efficiency of the unit can be improved. Therefore, it is very necessary to optimize the design of the fan impeller.

[0003] The prior art CN118391301A discloses a centrifugal fan impeller with combined blades. The blades are composed of blade groups; the blade groups include backward-curved blades and forward-inclined blades. There are inner guide vanes within the blade group between the backward-curved blades and the forward-inclined blades, and there are inter-guide vanes between adjacent blade groups; the inner guide vanes within the blade group include the first inner guide vane and the second inner guide vane within the blade group. Both the first inner guide vane and the second inner guide vane within the blade group are arc-shaped blades. The inter-guide vanes between the blade groups include the first inter-guide vane and the second inter-guide vane between the blade groups. Both the first inter-guide vane and the second inter-guide vane between the blade groups are straight blades; the inner guide vanes within the blade group are located at the outlet of the blade flow passage, and the inter-guide vanes between the blade groups are located at the inlet of the blade flow passage; a first guide vane through-hole is provided on the first inner guide vane within the blade group, and a second guide vane through-hole is provided on the second inner guide vane within the blade group. The first guide vane through-hole and the second guide vane through-hole are inclined with respect to the same radius line, and the inclination angles are equal; it can improve the flow characteristics, reduce the noise, and improve the conveying efficiency.

[0004] However, the above-mentioned centrifugal fan impeller has limitations in design, poor adaptability, and defects in vibration, noise, stability, mass, efficiency, etc. In addition, the forming of the blade is a process from elastic deformation to plastic deformation of the aluminum plate. In the blade forming process, when the blade has only one curved surface, its arc surface is relatively large, and the elastic deformation is very large during forming. The large elastic deformation results in a large springback distance of the blade, and there is a large deviation in the formed arc surface after springback. Therefore, in view of these problems, the applicant proposes a multi-layer flow-dividing impeller for a centrifugal fan to solve the above-mentioned problems and improve the working conditions performance and efficiency. Summary of the Invention

[0005] The purpose of the present invention is to propose a multi-layer flow-dividing impeller for a centrifugal fan to solve the disadvantages existing in the prior art.

[0006] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0007] A multi-layer split impeller for a centrifugal fan, wherein the impeller includes an upper cover plate and a lower cover plate, and multiple groups of blades are evenly spaced between the upper cover plate and the lower cover plate. The blades have a positive pressure surface and a negative pressure surface. It is characterized in that: the blade is composed of at least three planar or curved surface parts, and there are transition slope sections between at least three parts; wherein the first part is connected to the second part through a first transition slope section, and the second part is connected to the third part through a second transition slope section. The second part is a part protruding from the positive pressure surface of the first part, and the third part is a part protruding from the negative pressure surface of the second part. The transition slope section is a single-stage or multi-stage inclined surface or arc surface slope section structure, and the inclined surface slope K or arc surface curvature C between each transition slope section is not equal. The protruding height H of the second part relative to the positive pressure surface of the first part, and the protruding height L of the third part relative to the negative pressure surface of the second part, where H≥L.

[0008] Further, the first transition slope section and the second transition slope section adopt a single-stage inclined surface slope section structure, wherein the slope K of the first transition slope section > the slope K of the second transition slope section.

[0009] Further, the first transition slope section and the second transition slope section adopt a single-stage arc surface slope section structure, wherein the arc surface curvature C of the first transition slope section < the arc surface curvature C of the second transition slope section.

[0010] Further, the first part is located on the periphery of the second part, and the first transition slope section forms a "mouth" - shaped structure.

[0011] Further, the second part is located on the periphery of the third part, and the second transition slope section forms a "√" - shaped structure or a quasi - "V" - shaped structure.

[0012] Further, the first part is located on one side of the second part, and the first transition slope section forms a "-" - shaped structure or a "│" - shaped structure.

[0013] Further, H = (1.1 - 2.3)L.

[0014] Further, the first part, the second part, and the third part adopt the same curved and twisted blade structure.

[0015] Further, in the first part and the second part, one of them adopts a curved and twisted blade, and the other adopts a straight blade.

[0016] Further, the blades are welded to the upper cover plate and the lower cover plate in a fish - scale pattern welding manner.

[0017] The forming of the blade is a process in which the aluminum plate undergoes elastic deformation to plastic deformation. In the blade forming process, due to the elasticity of the aluminum plate, when the blade has only one curved surface, its arc surface is relatively large, and the elastic deformation during forming is very large. The large elastic deformation results in a large springback distance of the blade, and there is a large deviation in the shaped arc surface after springback. A multi-layer split-flow impeller for a centrifugal fan according to the present invention, the blade is composed of at least three planar or curved surface parts, and there are transition slope sections between at least three parts; wherein the first part is connected to the second part through the first transition slope section, and the second part is connected to the third part through the second transition slope section. The second part is a part protruding from the positive pressure surface relative to the first part, and the third part is a part protruding from the negative pressure surface relative to the second part. The transition slope section is a single-stage or multi-stage inclined surface or arc surface slope section structure, and the slope K of the inclined surface or the curvature C of the arc surface between each transition slope section are not equal. The protruding height H of the second part from the positive pressure surface relative to the first part, and the protruding height L of the third part from the negative pressure surface relative to the second part, where H≥L. Due to the improvement of the impeller structure of the centrifugal fan, by using multiple arcs / planes, the blade bends forward and backward during the forming process, eliminating or reducing the springback amount, so that the arc surface after the blade is formed has relatively good consistency, thereby obtaining good welding quality, solving the problems of poor adaptability, vibration, noise, instability, low quality, low efficiency, etc., and improving the operating performance and operating efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic structural diagram of the impeller of the centrifugal fan of the present invention;

[0019] Figure 2 It is a schematic enlarged structural diagram of the blade cross-section;

[0020] Figure 3 It is a simple schematic diagram of other embodiments of the blade composed of the first part, the second part, and the third part;

[0021] Figure 4 It is a simple schematic diagram of other embodiments of the first transition slope section and the second transition slope section.

[0022] In the figure: upper cover plate 1, blade 2, lower cover plate 3, positive pressure surface 41, negative pressure surface 42, first part 5, second part 6, third part 7, first transition slope section 8, second transition slope section 9, slope K of the inclined surface, curvature C of the arc surface, protruding height H of the second part from the positive pressure surface relative to the first part, protruding height L of the third part from the negative pressure surface relative to the second part. DETAILED DESCRIPTION OF THE INVENTION

[0023] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Apparently, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0024] The present invention will be further described in detail below with reference to the accompanying drawings.

[0025] As Figures 1-4 shown, a multi-layer split impeller for a centrifugal fan, wherein the impeller includes an upper cover plate 1 and a lower cover plate 3, and multiple groups of blades 2 are evenly spaced between the upper cover plate 1 and the lower cover plate 3. The blades 2 have a positive pressure surface 41 and a negative pressure surface 42; it is characterized in that: the blade 2 is composed of at least three planar or curved surface parts, and there are transition slope sections between at least three parts; wherein the first part 5 is connected to the second part 6 through the first transition slope section 8, and the second part 6 is connected to the third part 7 through the second transition slope section 9. The second part 6 is a part protruding from the positive pressure surface 41 of the first part 5, and the third part 7 is a part protruding from the negative pressure surface of the second part 6. The transition slope section is a single-stage or multi-stage inclined surface or arc surface slope section structure, wherein the slope K of the inclined surface or the curvature C of the arc surface between each transition slope section are not equal. The protruding height of the second part 6 relative to the positive pressure surface of the first part 5 is H, and the protruding height of the third part 7 relative to the negative pressure surface of the second part 6 is L, wherein H≥L.

[0026] Furthermore, the first transition slope section 8 and the second transition slope section 9 adopt a single-stage inclined surface slope section structure, wherein the slope K of the first transition slope section 8 > the slope K of the second transition slope section 9.

[0027] Furthermore, the first transition slope section 8 and the second transition slope section 9 adopt a single-stage arc surface slope section structure, wherein the arc surface curvature C of the first transition slope section 8 < the arc surface curvature C of the second transition slope section 9.

[0028] Furthermore, the first part 5 is located on the periphery of the second part 6, and the first transition slope section 8 forms a "mouth" - shaped structure.

[0029] Furthermore, the second part 6 is located on the periphery of the third part 7, and the second transition slope section 9 forms a "√" - shaped structure or a structure similar to a "V" - shaped structure.

[0030] Furthermore, the first part 5 is located on one side of the second part 6, and the first transition slope section 8 forms a "-" - shaped structure or a "│" - shaped structure.

[0031] Furthermore, H = (1.1 - 2.3)L.

[0032] Furthermore, the first part 5, the second part 6, and the third part 7 adopt the same blade structure with the same bending and torsion degree.

[0033] Furthermore, in the first part 5 and the second part 6, one of them adopts a twisted blade, and the other adopts a straight blade.

[0034] Furthermore, the fish-scale pattern welding method is adopted between the blade 2 and the upper cover plate 1 and the lower cover plate 3.

[0035] The blade forming is a process in which the aluminum plate changes from elastic deformation to plastic deformation. In the blade forming process, due to the elasticity of the aluminum plate, when the blade has only one curved surface, its arc surface is relatively large, and the elastic deformation is very large during forming. The large elastic deformation results in a large springback distance of the blade, and there is a large deviation in the formed arc surface after springback; A multi-layer split-flow impeller for a centrifugal fan of the present invention, the blade is composed of at least three planar or curved surface parts, and there are transition slope sections between at least three parts; the first part is connected to the second part through the first transition slope section, and the second part is connected to the third part through the second transition slope section. The second part is a part protruding from the positive pressure surface relative to the first part, and the third part is a part protruding from the negative pressure surface relative to the second part. The transition slope section is a single-stage or multi-stage inclined surface or arc surface slope section structure, and the slope K of the inclined surface or the curvature C of the arc surface between the transition slope sections are not equal. The protruding height of the second part relative to the positive pressure surface of the first part is H, and the protruding height of the third part relative to the negative pressure surface of the second part is L, where H≥L. Due to the improvement of the impeller structure of the centrifugal fan, multiple arcs / planes are adopted to make the blade bend forward and backward during the forming process, eliminating or reducing the springback amount, so that the arc surface after the blade is formed has relatively good consistency, thus obtaining good welding quality, solving the problems of poor adaptability, vibration, noise, instability, low quality, low efficiency, etc., and improving the working condition performance and operating efficiency.

Claims

1. A multi-layer split-flow impeller for a centrifugal fan, wherein the impeller comprises an upper cover plate (1) and a lower cover plate (3), and a plurality of groups of blades (2) are evenly spaced between the upper cover plate (1) and the lower cover plate (3), and the blades (2) have a positive pressure surface (41) and a negative pressure surface (42); characterized in that: The blade (2) is composed of at least three planar or curved surface parts, and there are transition slope sections between at least three parts; among them, the first part (5) is connected to the second part (6) through the first transition slope section (8), the second part (6) is connected to the third part (7) through the second transition slope section (9), the second part (6) is a part protruding from the positive pressure surface (41) relative to the first part (5), the third part (7) is a part protruding from the negative pressure surface relative to the second part (6), the transition slope section is a single-stage or multi-stage inclined surface or arc surface slope section structure, and the inclined surface slope K or arc surface curvature C between each transition slope section is not equal. The protruding height of the second part (6) relative to the positive pressure surface of the first part (5) is H, and the protruding height of the third part (7) relative to the negative pressure surface of the second part (6) is L, where H≥L and H=(1.1 - 2.3)L.

2. The multi-layer shunt impeller for a centrifugal fan according to claim 1, characterized in that, The first transition slope section (8) and the second transition slope section (9) adopt a single-stage inclined surface slope section structure, where the slope K of the first transition slope section (8) > the slope K of the second transition slope section (9).

3. The multi-layer split-flow impeller for a centrifugal fan according to claim 1, wherein, The first transition slope section (8) and the second transition slope section (9) adopt a single-stage arc surface slope section structure, where the arc surface curvature C of the first transition slope section (8) < the arc surface curvature C of the second transition slope section (9).

4. The multi-layer split-flow impeller for a centrifugal fan according to claim 1, wherein, The first part (5) is located on the periphery of the second part (6), and the first transition slope section (8) forms a "mouth" - shaped structure.

5. The multi-layer split-flow impeller for a centrifugal fan according to claim 1, characterized in that, The second part (6) is located on the periphery of the third part (7), and the second transition slope section (9) forms a "√" - shaped structure or a quasi - "V" - shaped structure.

6. The multi-layer split-flow impeller for a centrifugal fan according to claim 1, wherein, The first part (5) is located on one side of the second part (6), and the first transition slope section (8) forms a "-" - shaped structure or a "│" - shaped structure.

7. A multi-layer split-flow impeller for a centrifugal fan according to any one of claims 2-5, characterized in that, The first part (5), the second part (6), and the third part (7) adopt the same blade structure with bending and torsion.

8. The multi-layer split-flow impeller for a centrifugal fan according to claim 6, wherein, Among the first part (5) and the second part (6), one adopts a blade with bending and torsion, and the other adopts a straight - plate blade.

9. A multi-layer split-flow impeller for a centrifugal fan according to any one of claims 1-6, characterized in that, The blade (2) and the upper cover plate (1), the lower cover plate (3) are welded in a fish - scale pattern.

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