Impeller with shunting structure and fan with impeller

Abstract

According to the impeller with the flow dividing structure, N flow dividing rings are arranged in the radial direction of blades in a staggered mode, N is larger than or equal to 3, the flow dividing rings are arranged around a hub and connected with the multiple blades, the radial distances between the flow dividing rings are unequal, and the flow dividing rings are arranged in an overlapped mode in the axial direction of the pressure faces / suction faces of the blades; the shunting ring close to the hub side is the first shunting ring, the outlet end of the first shunting ring is located on the blade and is spaced from the rear edge of the blade, the shunting ring on the outermost side away from the hub side is the Nth shunting ring, and the inlet end of the Nth shunting ring protrudes out of the front edge of the blade. Through the improved design of the impeller, particularly the design of the N flow dividing rings, the fan can reduce the shaking of the impeller in a variable-speed operation state, so that the flow of the fan can be improved, the flow stability and uniformity of the fan can be guaranteed, and the efficiency of the fan can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of fluid machinery, and more particularly to an impeller, and more specifically to an impeller with a flow splitting structure and a fan having the impeller. Background Art

[0002] Fans mainly consist of an impeller, a casing, an air inlet, a transmission component, a motor, a bracket, a regulating door, a silencer, etc., and are widely used in various industries. Existing fans on the market generally have problems such as impeller wear, bearing failures, vibration and noise, motor failures, corrosion problems, etc. With the increasing requirements for fans by people, the transformation of the efficiency of fans has become increasingly strong. Thus, it is very necessary to optimize the design of fans.

[0003] The prior art CN109681463A discloses a tubular centrifugal impeller, which includes a support ring and centrifugal tubes. The number n of the support rings is ≥2, and the radii are R1, R2, … Rn in ascending order, and are concentrically arranged with O as the center; the number m of the centrifugal tubes is ≥2, the inner diameter of the tube is r, and the bending radius Rg satisfies the relationship of ∞≥Rg>Rn / 2; the circumferential extension lines of the centrifugal tubes pass through point O and are evenly distributed; the thicknesses of the support rings are the same, all being S (of course, the thicknesses of the support rings can also be different), and a plurality of holes are distributed on them, and the shapes and positions of the holes are determined by the penetration projection of the centrifugal tubes; the centrifugal tubes are fixed by welding or gluing at the places where they pass through the holes. Among them, the bending radii of the plurality of centrifugal tubes can be the same or different. In this way, when the impeller rotates, the working fluid only flows inside the centrifugal tubes and does not enter the cavity formed between the largest and smallest support rings, and the frictional resistance loss of the impeller is extremely small, improving the impeller efficiency.

[0004] However, the above structure has limitations in design, and in the actual application process of the fan, especially under variable speed operation conditions, the impeller will have problems such as jitter, unstable / uneven fan flow rate, and reduced fan efficiency. Considering the above problems, the applicant of the present invention proposes an impeller with a flow splitting structure and a fan having the impeller, in order to optimize the impeller structure. Summary of the Invention

[0005] The purpose of the present invention is to solve the drawbacks existing in the prior art, and to propose an impeller with a flow splitting structure and a fan having the impeller.

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

[0007] An impeller with a flow splitting structure, which includes a hub. A plurality of blades are evenly arranged on the circumferentially outer side wall of the hub. The blades have blade roots, blade tips, leading edges of the blades, and trailing edges of the blades. It is characterized in that: N flow splitting rings are arranged in a staggered manner along the radial direction of the blades, N≥3. The flow splitting rings surround the hub and connect a plurality of blades. The radial distances between the flow splitting rings are not equal, and the flow splitting rings are arranged in an overlapping manner along the axial direction of the pressure surface / suction surface of the blades. The flow splitting ring close to the hub side is the first flow splitting ring, and the outlet end of the first flow splitting ring is spaced from the trailing edge of the blade on the blade. The outermost flow splitting ring far from the hub side is the Nth flow splitting ring, and the inlet end of the Nth flow splitting ring protrudes beyond the leading edge of the blade.

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

[0009] Further, G1>G2.

[0010] Further, along the direction from the blade root to the blade tip, the radial distances between the flow splitting rings are distributed in an arithmetic or geometric progression.

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

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

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

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

[0015] Further, T4≥T1>T2, T2 = T3.

[0016] A fan, which is characterized in that the fan includes a guide vane cylinder, a motor, and a motor bracket. The impeller is fixed to the end of the motor, and the motor is installed on the inner side wall of the guide vane cylinder through the motor bracket. The impeller adopts the impeller with the flow splitting structure described above.

[0017] Furthermore, the hub, the blades, and the flow splitting ring are integrally injection molded.

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

[0019] Furthermore, the first flow splitting ring is arranged at the blade outlet near the blade root.

[0020] The present invention has the following advantages compared with the prior art:

[0021] Through the improved design of the impeller, especially the design of N flow splitting rings, it is possible to reduce the impeller jitter when the fan is operating under variable speed conditions, thereby improving the fan flow rate and ensuring the stability and uniformity of the fan flow rate, and improving the fan efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

[0024] Figure 3 is a schematic diagram of the radial structure expansion of the blade with 3 flow splitting rings after optimization of the present invention compared with the prior art;

[0025] Figure 4 is a schematic diagram of the radial structure expansion of the blade with 4 flow splitting rings after optimization of the present invention compared with the prior art.

[0026] In the figure: hub 1, blade 2, blade root 21, blade tip 22, blade leading edge 23, blade trailing edge 24, flow splitting ring 3, first flow splitting ring 31, second flow splitting ring 32, third flow splitting ring 33, fourth flow splitting ring 34, Nth flow splitting ring 3N, air guide cylinder 4, motor 5, motor bracket 6, radial distance G1 between the first flow splitting ring 31 and the blade root 21, radial distance G2 between the Nth flow splitting ring 3N and the blade tip 22, impeller inlet radius R, distance L between the outlet end of the first flow splitting ring 31 and the blade trailing edge 24, distance W between the inlet end of the Nth flow splitting ring 3N and the blade leading edge 23, axial length T1 of the first flow splitting ring 31, axial length T2 of the second flow splitting ring 32, axial length T3 of the third flow splitting ring 33, axial length T4 of the fourth flow splitting ring 34, overlapping axial length T12 between the first flow splitting ring 31 and the second flow splitting ring 32, overlapping axial length T23 between the second flow splitting ring 32 and the third flow splitting ring 33, overlapping axial length T34 between the third flow splitting ring 33 and the fourth flow splitting ring 34. DETAILED DESCRIPTION OF THE INVENTION

[0027] 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.

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

[0029] As Figures 1-4 shown, an impeller with a flow splitting structure includes a hub 1. A plurality of blades 2 are evenly arranged on the circumferential outer side wall of the hub 1. The blade 2 has a blade root 21, a blade tip 22, a blade leading edge 23, and a blade trailing edge 24. It is characterized in that: N flow splitting rings 3 are arranged staggered along the radial direction of the blade, N≥3. The flow splitting rings surround the hub 1 and connect a plurality of blades 2. The radial distances between the flow splitting rings 3 are not equal. The flow splitting rings 3 are arranged overlappingly along the axial direction of the blade pressure surface / suction surface. The flow splitting ring 3 close to the hub side is the first flow splitting ring 31. The outlet end of the first flow splitting ring 31 is spaced from the blade trailing edge 24 on the blade 2. The outermost flow splitting ring 3 away from the hub side is the Nth flow splitting ring 3N. The inlet end of the Nth flow splitting ring 3N protrudes beyond the blade leading edge 23.

[0030] Through the improved design of the impeller, especially the design of the N flow splitting rings, it is possible to reduce the impeller jitter when the fan is operating under variable speed conditions, thereby improving the fan flow rate and ensuring the stability and uniformity of the fan flow rate, and improving the fan efficiency.

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

[0032] Further, G1>G2.

[0033] Further, along the direction from the blade root 21 to the blade tip 22, the radial distances between the flow splitting rings 3 are distributed in an arithmetic or geometric progression.

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

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

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

[0037] Further, when N = 4, the axial lengths of the first flow dividing ring 31, the second flow dividing ring 32, the third flow dividing ring 33, and the fourth flow dividing ring 34 are T1, T2, T3, and T4 respectively. The overlapping axial length between the first flow dividing ring 31 and the second flow dividing ring 32 is T12, the overlapping axial length between the second flow dividing ring 32 and the third flow dividing ring 33 is T23, and the overlapping axial length between the third flow dividing ring 33 and the fourth flow dividing 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] Further, T4 ≥ T1 > T2, and T2 = T3.

[0039] The settings of the structural dimensions and positions of the flow dividing rings can suppress / reduce the eddy current of the flow dividing rings, thereby better improving the fan flow rate and ensuring the stability and uniformity of the fan flow rate, and improving the fan efficiency.

[0040] A fan, characterized in that the fan includes a guide vane tube 4, a motor 5, and a motor bracket 6. The impeller is fixed to the end of the motor 5, and the motor 5 is installed on the inner side wall of the guide vane tube 4 through the motor bracket 6. The impeller adopts the impeller with a flow dividing structure as described above.

[0041] Further, the hub 1, the blade 2, and the flow dividing ring 3 are integrally injection molded.

[0042] Further, the blade 2 is a three-dimensional twisted structure.

[0043] Further, the first flow dividing ring 31 is arranged at the blade outlet near the blade root 21.

[0044] In an impeller with a flow dividing structure according to the present invention, N flow dividing rings are arranged in an alternating manner along the radial direction of the blade, N ≥ 3. The flow dividing rings are arranged around the hub and connect multiple blades. The radial distances between the flow dividing rings are not equal, and the flow dividing rings are arranged in an overlapping manner along the axial direction of the blade pressure surface / suction surface; the flow dividing ring close to the hub side is the first flow dividing ring, and the outlet end of the first flow dividing ring is spaced from the blade trailing edge on the blade. The outermost flow dividing ring far from the hub side is the Nth flow dividing ring, and the inlet end of the Nth flow dividing ring protrudes beyond the blade leading edge. Through the improved design of the impeller, especially the design of N flow dividing rings, the impeller jitter can be reduced during the variable-speed operation of the fan, thereby improving the fan flow rate and ensuring the stability and uniformity of the fan flow rate, and improving the fan efficiency.

[0045] The above embodiments are illustrative of the present invention and not restrictive thereof. It will be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present 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), a plurality of blades (2) being evenly arranged on the circumferential outer wall of the hub (1), the blades (2) having 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 arranged in a staggered manner along the radial direction of the blade, N≥3, the flow divider rings are arranged around the hub (1) and connect multiple blades (2), the radial spacing between the flow divider rings (3) is unequal, and the flow divider rings (3) are arranged in an overlapping manner along the axial direction of the pressure surface / suction surface of the blade; the flow divider ring (3) close to the hub side is a 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 spacing between the blade trailing edge (24), the outermost flow divider ring (3) farthest from the hub side is an Nth flow divider ring (3N), and the inlet end of the Nth flow divider ring (3N) is arranged to protrude from the blade leading edge (23).

2. An impeller with a split flow structure as claimed in claim 1, characterized in that: A radial distance G1 between the first flow splitter ring (31) and the blade root (21) is not equal to a radial distance G2 between the Nth flow splitter ring (3N) and the blade tip (22).

3. An impeller with a split flow structure as claimed in claim 2, characterized in that: G1>G2.

4. The impeller with a split flow structure according to claim 1, characterized in that: Along the direction from the blade root (21) to the blade tip (22), the radial spacing between the flow splitter rings (3) is distributed in an arithmetic progression or a geometric progression.

5. The impeller with a split flow structure according to claim 1, characterized in that: Among the N flow diverter rings (3), the thickness of the first flow diverter ring (31) gradually decreases along the flow path direction, the thickness of the Nth flow diverter ring (3N) gradually increases along the flow path direction, and the remaining flow diverter rings are arranged with equal thickness.

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

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

8. The impeller with a split flow structure according to claim 1, characterized in that: When N=4, the axial lengths of the first diverter ring (31), the second diverter ring (32), the third diverter ring (33), and the fourth diverter ring (34) are T1, T2, T3, and T4, respectively; the axial length of the overlap between the first diverter ring (31) and the second diverter ring (32) is T12, the axial length of the overlap between the second diverter ring (32) and the third diverter ring (33) is T23, and the axial length of the overlap between the third diverter ring (33) and the fourth diverter ring (34) is T34, wherein T12=(0.1-0.2)T1, T23=(0.2-0.3)T2, and T34=(0.3-0.4)T3.

9. An impeller with a split flow structure as claimed in claim 8, characterized in that: T4≥T1>T2, T2=T3.

10. A fan, characterized in that: The fan comprises an air guide tube (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 air guide tube (4) through the motor bracket (6); and the impeller is an impeller with a diversion structure as described in any one of claims 1 to 9.

11. A fan according to claim 10, characterized in that: The hub (1), the blades (2) and the splitter ring (3) are integrally injection molded.

12. A fan according to claim 10, characterized in that: The blade (2) is a three-dimensional twisted structure.

13. A fan according to claim 10, characterized in that: The first flow splitter ring (31) is arranged at a blade outlet close to the blade root (21).

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