Impeller with shunt structure and fan with same

Abstract

This invention discloses an impeller with a flow-splitting structure, comprising N flow-splitting rings staggered along the radial direction of the blades, where N ≥ 3. The flow-splitting rings surround the hub and connect to multiple blades, with unequal radial spacing between each ring. The flow-splitting rings overlap along the axial direction of the blade's pressure / suction surface. The flow-splitting ring closest to the hub is the first flow-splitting ring, with its outlet end located on the blade and spaced from the blade's trailing edge. The outermost flow-splitting ring furthest from the hub is the Nth flow-splitting ring, with its inlet end protruding from the blade's leading edge. Through this improved impeller design, particularly the design of the N flow-splitting rings, impeller vibration is reduced during variable-speed operation, thereby increasing the fan flow rate and ensuring its stability and uniformity, ultimately improving fan efficiency.

Description

Technical Field

[0001] This invention relates to the field of fluid machinery technology, specifically to an impeller, and more specifically to an impeller with a flow splitting structure and a fan having the impeller. Background Technology

[0002] Fans mainly consist of impellers, casings, air inlets, transmission components, motors, supports, regulating dampers, and silencers, and are widely used in various industries. Existing fans on the market commonly suffer from problems such as impeller wear, bearing failures, vibration and noise, motor malfunctions, and corrosion. As demands for fans increase, the need for performance improvements is growing. Therefore, optimizing the design of fans is essential.

[0003] Existing technology CN109681463A discloses a tubular centrifugal impeller, including support rings and centrifugal tubes. The number of support rings n≥2, with radii ranging from smallest to largest as R1, R2, ..., Rn, concentrically arranged with O as the center; the number of centrifugal tubes m≥2, with an inner diameter of r, and a bending radius Rg satisfying the relationship ∞≥Rg>Rn / 2; the circumferential extension lines of the centrifugal tubes pass through point O and are evenly distributed; the support rings have the same thickness, S (although the thickness of the support rings can vary), and multiple holes are distributed on them, the shape and position of which are determined by the projection of the centrifugal tubes through them; the centrifugal tubes are fixed by welding or gluing at the holes. The bending radii of the multiple centrifugal tubes can be the same or different. In this way, when the impeller is running, the working fluid flows only from inside the centrifugal tubes and does not enter the cavity formed between the largest and smallest support rings, resulting in minimal frictional resistance loss and improved impeller efficiency.

[0004] However, the above structure has design limitations, and in actual applications, especially during variable speed operation, the impeller may vibrate, resulting in unstable / uneven flow and reduced efficiency. Considering these issues, the applicant proposes an impeller with a flow-diverting structure and a fan with this impeller, aiming to optimize the impeller structure. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art by proposing an impeller with a flow splitting structure and a fan having the impeller.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] An impeller with a flow-splitting structure includes a hub, on which multiple blades are uniformly arranged on the outer circumferential wall of the hub. Each blade has a root, a tip, a leading edge, and a trailing edge. The impeller is characterized by: N flow-splitting rings, where N ≥ 3, arranged alternately along the radial direction of the blades. The flow-splitting rings surround the hub and connect to the multiple blades. The radial spacing between the flow-splitting rings is unequal, and the flow-splitting rings overlap along the axial direction of the pressure / suction surface of the blades. The flow-splitting ring closest to the hub is the first flow-splitting ring, and its outlet end is located on the blade with a gap between it and the trailing edge. The outermost flow-splitting ring furthest from the hub is the Nth flow-splitting ring, and its inlet end protrudes beyond the leading edge of the blade.

[0008] Furthermore, the radial distance G1 between the first split ring and the blade root is not equal to the radial distance G2 between the Nth split ring and the blade tip.

[0009] Furthermore, G1 > G2.

[0010] Furthermore, along the direction from the leaf root to the leaf tip, the radial spacing between the flow dividers follows an arithmetic or geometric sequence.

[0011] Furthermore, among the N flow divider rings, the thickness of the first flow divider ring gradually decreases along the flow path direction, the thickness of the Nth flow divider ring gradually increases along the flow path direction, and the remaining flow divider rings are arranged with equal thickness.

[0012] Furthermore, the impeller inlet radius is R, and the distance between the outlet end of the first split ring and the trailing edge of the blade is L, where L = (0.01~0.06)R.

[0013] Furthermore, the impeller inlet radius is R, and the distance between the inlet end of the Nth split ring and the leading edge of the blade is W, where W = (0.08~0.12)R.

[0014] Furthermore, when N=4, the axial lengths of the first, second, third, and fourth split rings are T1, T2, T3, and T4, respectively. The axial length of the overlap between the first and second split rings is T12, the axial length of the overlap between the second and third split rings is T23, and the axial length of the overlap between the third and fourth split rings is T34, where T12 = (0.1~0.2)T1, T23 = (0.2~0.3)T2, and T34 = (0.3~0.4)T3.

[0015] Furthermore, T4≥T1>T2, T2=T3.

[0016] A fan, characterized in that the fan includes an air guide tube, a motor, a motor bracket, an impeller fixed to the end of the motor, the motor being mounted on the inner wall of the air guide tube via the motor bracket, and the impeller being the impeller with the flow splitting structure described above.

[0017] Furthermore, the hub, blades, and splitter ring are injection molded as a single unit.

[0018] Furthermore, the blades have a three-dimensional twisted structure.

[0019] Furthermore, the first diversion ring is located at the blade outlet near the blade root.

[0020] Compared with the prior art, the present invention has the following advantages:

[0021] By improving the impeller design, especially the design of N flow dividers, the impeller vibration can be reduced when the fan is operating at variable speed, thereby increasing the fan flow rate and ensuring the stability and uniformity of the fan flow rate, thus improving the fan efficiency. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the fan structure of the present invention;

[0023] Figure 2 This is an impeller structure in the prior art;

[0024] Figure 3 This is a schematic diagram showing the radial structure of the blade with three flow splitting rings optimized by the present invention compared to the prior art;

[0025] Figure 4 This is a schematic diagram showing the radial structure of the blade with four flow dividers, optimized by the present invention compared to the prior art.

[0026] In the diagram: Hub 1, Blade 2, Blade Root 21, Blade Tip 22, Blade Leading Edge 23, Blade Trailing Edge 24, Splitting Ring 3, First Splitting Ring 31, Second Splitting Ring 32, Third Splitting Ring 33, Fourth Splitting Ring 34, Nth Splitting Ring 3N, Air Guide 4, Motor 5, Motor Support 6, Radial distance G1 between the First Splitting Ring 31 and Blade Root 21, Radial distance G2 between the Nth Splitting Ring 3N and Blade Tip 22, Impeller Inlet Radius R, Outlet end of the First Splitting Ring 31 and Blade Trailing Edge 24 The distance between L, the distance between the inlet end of the Nth split ring 3N and the leading edge 23 of the blade, the axial length T1 of the first split ring 31, the axial length T2 of the second split ring 32, the axial length T3 of the third split ring 33, the axial length T4 of the fourth split ring 34, the axial length T12 of the overlap between the first split ring 31 and the second split ring 32, the axial length T23 of the overlap between the second split ring 32 and the third split ring 33, and the axial length T34 of the overlap between the third split ring 33 and the fourth split ring 34. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] The present invention will now be described in further detail with reference to the accompanying drawings.

[0029] like Figure 1-4 As shown, an impeller with a flow-dividing structure includes a hub 1, on which a plurality of blades 2 are uniformly arranged on the outer circumferential side of the hub 1. Each blade 2 has a root 21, a tip 22, a leading edge 23, and a trailing edge 24. The impeller is characterized by: N flow-dividing rings 3 arranged alternately along the radial direction of the blades, where N ≥ 3. The flow-dividing rings surround the hub 1 and connect the plurality of blades 2. The radial spacing between each flow-dividing ring 3 is unequal. The flow-dividing rings 3 are arranged overlapping along the axial direction of the pressure / suction surface of the blades. The flow-dividing ring 3 closest to the hub is the first flow-dividing ring 31, whose outlet end is located on the blade 2 with a gap between it and the trailing edge 24. The outermost flow-dividing ring 3 furthest from the hub is the Nth flow-dividing ring 3N, whose inlet end protrudes from the leading edge 23 of the blade.

[0030] By improving the impeller design, especially the design of N flow dividers, the impeller vibration can be reduced when the fan is operating at variable speed, thereby increasing the fan flow rate and ensuring the stability and uniformity of the fan flow rate, thus improving the fan efficiency.

[0031] Furthermore, the radial distance G1 between the first split ring 31 and the blade root 21 is not equal to the radial distance G2 between the Nth split ring 3N and the blade tip 22.

[0032] Furthermore, G1 > G2.

[0033] Furthermore, along the direction from the leaf root 21 to the leaf tip 22, the radial spacing between the flow divider rings 3 is distributed in an arithmetic or geometric sequence.

[0034] Furthermore, among the N flow divider rings 3, the thickness of the first flow divider ring 31 gradually decreases along the flow path direction, the thickness of the Nth flow divider ring 3N gradually increases along the flow path direction, and the remaining flow divider rings are arranged with equal thickness.

[0035] Furthermore, the inlet radius of the impeller is R, and the distance between the outlet end of the first split ring 31 and the trailing edge 24 of the blade is L, where L = (0.01~0.06)R.

[0036] Furthermore, the impeller inlet radius is R, and the distance between the inlet end of the Nth split ring 3N and the leading edge 23 of the blade is W, where W = (0.08~0.12)R.

[0037] Furthermore, when N=4, the axial lengths of the first diversion ring 31, the second diversion ring 32, the third diversion ring 33, and the fourth diversion ring 34 are T1, T2, T3, and T4, respectively. The axial length of the overlap between the first diversion ring 31 and the second diversion ring 32 is T12, the axial length of the overlap between the second diversion ring 32 and the third diversion ring 33 is T23, and the axial length of the overlap between the third diversion ring 33 and the fourth diversion ring 34 is T34, where T12 = (0.1~0.2)T1, T23 = (0.2~0.3)T2, and T34 = (0.3~0.4)T3.

[0038] Furthermore, T4≥T1>T2, T2=T3.

[0039] The arrangement of the various structural dimensions and positions of the flow divider ring can suppress / reduce the eddies in the flow divider ring, thereby better improving the fan flow rate and ensuring the stability and uniformity of the fan flow rate, thus improving the fan efficiency.

[0040] A fan, characterized in that the fan includes an air guide duct 4, a motor 5, and a motor bracket 6, an impeller is fixed to the end of the motor 5, the motor 5 is mounted on the inner wall of the air guide duct 4 through the motor bracket 6, and the impeller is the impeller with the flow splitting structure described above.

[0041] Furthermore, the hub 1, blade 2, and splitter ring 3 are injection molded as a single unit.

[0042] Furthermore, blade 2 has a three-dimensional twisted structure.

[0043] Furthermore, the first diversion ring 31 is located at the blade outlet near the blade root 21.

[0044] This invention discloses an impeller with a flow-splitting structure, comprising N flow-splitting rings staggered along the radial direction of the blades, where N ≥ 3. The flow-splitting rings surround the hub and connect to multiple blades, with unequal radial spacing between each ring. The flow-splitting rings overlap along the axial direction of the blade's pressure / suction surface. The flow-splitting ring closest to the hub is the first flow-splitting ring, with its outlet end located on the blade and spaced from the blade's trailing edge. The outermost flow-splitting ring furthest from the hub is the Nth flow-splitting ring, with its inlet end protruding from the blade's leading edge. Through this improved impeller design, particularly the design of the N flow-splitting rings, impeller vibration is reduced during variable-speed operation, thereby increasing the fan flow rate and ensuring its stability and uniformity, ultimately improving fan efficiency.

[0045] The above embodiments are illustrative of the present invention and not intended to limit the invention. It is understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the invention. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. An impeller with a flow splitting structure, comprising a hub (1), wherein a plurality of blades (2) are uniformly arranged on the outer circumferential wall of the hub (1), and the blades (2) have a blade root (21), a blade tip (22), a blade leading edge (23), and a blade trailing edge (24); characterized in that: N flow divider rings (3) are staggered along the radial direction of the blades, where N≥3. The flow divider rings are arranged around the hub (1) and connect to multiple blades (2). The radial spacing between the flow divider rings (3) is not equal. The flow divider rings (3) are arranged overlapping along the axial direction of the pressure / suction surface of the blades. The flow divider ring (3) closest to the hub side is the first flow divider ring (31). The outlet end of the first flow divider ring (31) is located on the blade (2) and there is a gap between it and the trailing edge (24) of the blade. The outermost flow divider ring (3) furthest from the hub side is the Nth flow divider ring (3N). The inlet end protrudes from the leading edge (23) of the blade; the radial distance G1 between the first split ring (31) and the blade root (21) is not equal to the radial distance G2 between the Nth split ring (3N) and the blade tip (22); G1 > G2; along the direction from the blade root (21) to the blade tip (22), the radial spacing between the split rings (3) is distributed in an arithmetic or geometric sequence; among the N split rings (3), the thickness of the first split ring (31) gradually decreases along the flow path, the thickness of the Nth split ring (3N) gradually increases along the flow path, and the remaining split rings are arranged with equal thickness.

2. The impeller with a flow-dividing structure as described in claim 1, characterized in that, The impeller inlet radius is R, and the distance between the outlet end of the first split ring (31) and the trailing edge (24) of the blade is L, where L = (0.01~0.06)R.

3. The impeller with a flow-dividing structure as described in claim 1, characterized in that, The impeller inlet radius is R, and the distance between the inlet end of the Nth split ring (3N) and the leading edge of the blade (23) is W, where W = (0.08~0.12)R.

4. An impeller with a flow-diverting structure as described in claim 1, characterized in that, When N=4, the axial lengths of the first diversion ring (31), the second diversion ring (32), the third diversion ring (33), and the fourth diversion ring (34) are T1, T2, T3, and T4, respectively. The axial length of the overlap between the first diversion ring (31) and the second diversion ring (32) is T12, the axial length of the overlap between the second diversion ring (32) and the third diversion ring (33) is T23, and the axial length of the overlap between the third diversion ring (33) and the fourth diversion ring (34) is T34, where T12 = (0.1~0.2)T1, T23 = (0.2~0.3)T2, and T34 = (0.3~0.4)T3.

5. An impeller with a flow-dividing structure as described in claim 4, characterized in that, T4≥T1>T2, T2=T3.

6. A fan, characterized in that, The fan includes a wind duct (4), a motor (5), and a motor bracket (6). The impeller is fixed to the end of the motor (5). The motor (5) is mounted on the inner wall of the wind duct (4) through the motor bracket (6). The impeller is an impeller with a flow splitting structure as described in any one of claims 1 to 5.

7. A fan as described in claim 6, characterized in that, The hub (1), blade (2), and flow divider ring (3) are injection molded as a whole.

8. A fan as described in claim 6, characterized in that, The blade (2) is a three-dimensional twisted structure.

9. A fan as described in claim 6, characterized in that, The first flow divider ring (31) is located at the blade outlet near the blade root (21).

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