Large-flow fan structure

Abstract

The utility model relates to the technical field of fans, and discloses a large-flow fan structure which comprises a machine shell, a fan cover is arranged at the upper end of the machine shell, an air inlet is formed in an end opening of the fan cover, a movable impeller rotationally installed in the machine shell is arranged at the lower end of the air inlet, and a support is arranged in the machine shell. A fixed impeller arranged below the movable impeller is fixedly arranged on the support, and the fixed impeller is used for guiding airflow generated by the movable impeller. The diameter of the air inlet ranges from 23 mm to 24 mm. The fixed impeller comprises a supporting plate fixed to the support, the bottom of the supporting plate is provided with multiple sets of inner blades which are annularly distributed at equal intervals with the center point of the supporting plate as the axis, the inner blades are in an arc shape, and the multiple sets of inner blades are spirally distributed. The air inlet of the fan is enlarged, and through the special design of the fixed impeller, the effects of reducing noise and stabilizing airflow can be achieved, and the working efficiency of the fan is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of fans, in particular to a large-flow fan structure applied to dust collection equipment. Background Art

[0002] The dust collection equipment is used for cleaning the environment. The dust collection equipment is provided with a fan to generate negative pressure to produce suction. The existing fan is driven by a brushless motor and operates at a speed of 80,000 revolutions per minute. When the air inlet of the dust collection equipment is blocked, the speed is increased to 130,000 revolutions per minute through the internal control chip.

[0003] The existing fan is provided with a wind cover, a moving impeller and a stationary impeller, and the moving impeller is driven by a brushless motor to rotate for operation. The stationary impeller is used to guide the wind generated by the moving impeller. However, when the wind passes through the stationary impeller, due to the high wind flow velocity, certain noise will be generated.

[0004] The efficiency of the fan is equal to the flow rate multiplied by the vacuum degree. Under the condition of ensuring low noise and stability, the air inlet of the existing fan is generally set at about 20.5 mm. If the efficiency of the fan is to be improved, the air inlet of the fan needs to be increased. However, expanding the air inlet will have the effect of increasing noise. Summary of the Utility Model

[0005] Based on this, in view of the problem of low efficiency of the existing fan, it is necessary to provide a large-flow fan structure.

[0006] To achieve the above object, the utility model provides the following technical solution: A large-flow fan structure, including a housing, a wind cover is provided at the upper end of the housing, an air inlet is provided at the port of the wind cover, a moving impeller rotatably installed in the housing is provided at the lower end of the air inlet, a support is provided inside the housing, and a stationary impeller fixed on the support and located below the moving impeller is provided, and the stationary impeller is used to guide the air flow generated by the moving impeller.

[0007] The diameter of the air inlet is 23 mm to 24 mm. The air inlet is increased to improve the fan efficiency.

[0008] The stationary impeller includes a support plate fixed on the support, a plurality of groups of inner blades annularly and equidistantly distributed with the center point of the support plate as the axis are provided at the bottom of the support plate, the inner blades are arc-shaped, and the plurality of groups of inner blades are spirally distributed. The guiding effect on the air flow is stable.

[0009] Outer blades are extended outward at the outer edges of the plurality of groups of inner blades, and the edges of the outer blades are fixedly connected to the inner wall of the housing, and a guiding channel is formed between the adjacent outer blades and the inner wall of the housing.

[0010] In a preferred embodiment, the present utility model can be further configured such that: the upper end of the outer blade is flush with the upper end of the support plate, and the lower end is flush with the bottom of the inner blade. The outer blade is inclined at the side edge of the support plate and is arranged in an arc shape.

[0011] In a preferred embodiment, the present utility model can be further configured such that: the air outlet cross-sectional area of the fixed impeller is 1.2 to 1.5 times that of the air inlet cross-sectional area of the air inlet.

[0012] By adopting the above technical solution, the airflow passing through the fixed impeller reduces noise.

[0013] In summary, the present utility model includes at least one of the following beneficial technical effects:

[0014] The air inlet of the fan is enlarged, and through the special design of the fixed impeller, it can play a role in noise reduction and airflow stabilization, improving the working efficiency of the fan. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The drawings are used to provide a further understanding of the present utility model, and constitute a part of the specification. Together with the embodiments of the present utility model, they are used to explain the present utility model, and do not constitute a limitation to the present utility model. In the drawings:

[0016] Figure 1 is a schematic structural diagram of the present utility model;

[0017] Figure 2 is an exploded view of the present utility model;

[0018] Figure 3 is a schematic structural diagram of the fixed impeller in the present utility model;

[0019] Figure 4 is a top view of the fixed impeller in the present utility model;

[0020] Figure 5 is a bottom view of the fixed impeller in the present utility model.

[0021] In the drawings:

[0022] 1. Housing; 11. Wind hood; 12. Air inlet; 13. Bracket; 2. Rotating impeller; 3. Fixed impeller; 31. Support plate; 32. Outer blade; 321. Air guiding channel; 33. Inner blade. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0024] In Figures 1-5 In the illustrated embodiment, the present invention provides a technical solution: a large-flow fan structure, including a housing 1, a wind hood 11 is provided at the upper end of the housing 1, an air inlet 12 is provided at the port of the wind hood 11, and the diameter of the air inlet 12 is 23 mm to 24 mm. In this embodiment, the diameter of the air inlet 12 is 23.5 mm.

[0025] A moving impeller 2 rotatably installed in the housing 1 is provided at the lower end of the air inlet 12. A support 13 is provided inside the housing 1, a wind channel is provided on the support 13, and a stationary impeller 3 placed below the moving impeller 2 is fixedly provided on the support 13. The stationary impeller 3 is used to guide the air flow generated by the moving impeller 2 and pass through the wind channel of the support 13.

[0026] Further, the stationary impeller 3 includes a support plate 31 fixed to the support 13. Eleven inner blades 33 are provided at the bottom of the support plate 31 and are annularly and equally spaced around the center point of the support plate 31. The number of the inner blades 33 is an odd number, the inner blades 33 are arc-shaped, and the eleven inner blades 33 are spirally distributed;

[0027] An outer blade 32 extends outward from the outer edge of the eleven inner blades 33, and the edge of the outer blade 32 is fixedly connected to the inner wall of the housing 1, and a wind guiding channel 321 is formed between the adjacent outer blades 32 and the inner wall of the housing 1.

[0028] Further, the upper end of the outer blade 32 is flush with the upper end of the support plate 31, the lower end is flush with the bottom of the inner blade 33, the outer blade 32 is inclined at the side edge of the support plate 31, and is arc-shaped, with an arc length of 22.54 mm.

[0029] The air outlet cross-sectional area of the stationary impeller 3 is 1.2 to 1.5 times the air inlet cross-sectional area of the air inlet 12.

[0030] Next, the specific working principle of the present invention will be elaborated in detail: The brushless motor provided inside the housing 1 drives the moving impeller 2 to rotate. The air flow enters the inside of the housing 1 from the air inlet 12, enters the wind guiding channel 321 at the top of the stationary impeller 3 through the moving impeller 2, the air flow passes through the arc-shaped wind guiding channel 321, enters between the inner blades 33, and is then discharged through the wind channel of the support 13.

[0031] Since the efficiency of the fan is equal to the flow rate multiplied by the vacuum degree, in this application, by enlarging the diameter of the air inlet 12 and through the special design of the fixed impeller 3, the air flow rate is increased, the noise is reduced, and the efficiency of the fan is improved.

[0032] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand 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 the present invention is defined by the appended claims and their equivalents.

Claims

1. A large-flow fan structure, including a casing (1), a wind hood (11) is provided at the upper end of the casing (1), an air inlet (12) is provided at the port of the wind hood (11), a moving impeller (2) rotatably installed in the casing (1) is provided at the lower end of the air inlet (12), a support (13) is provided inside the casing (1), a stationary impeller (3) placed below the moving impeller (2) is fixedly provided on the support (13), and the stationary impeller (3) is used for guiding the air flow generated by the moving impeller (2). It is characterized in that: The diameter of the air inlet (12) is 23 mm to 24 mm; The stationary impeller (3) includes a support plate (31) fixed on the support (13), a plurality of groups of inner blades (33) annularly and equidistantly distributed with the center point of the support plate (31) as the axis are provided at the bottom of the support plate (31), the inner blades (33) are arc-shaped, and the plurality of groups of inner blades (33) are spirally distributed; Outer blades (32) extend outward from the outer edges of the plurality of groups of inner blades (33), the edges of the outer blades (32) are fixedly connected to the inner wall of the casing (1), and a wind guiding channel (321) is formed between the adjacent outer blades (32) and the inner wall of the casing (1).

2. The structure of a large-flow fan according to claim 1, wherein: The upper end of the outer blade (32) is flush with the upper end of the support plate (31) and the lower end is flush with the bottom of the inner blade (33), and the outer blade (32) is inclined at the side edge of the support plate (31) and is arc-shaped.

3. The structure of a large-flow fan according to claim 1, characterized in that: The air outlet cross-sectional area of the stationary impeller (3) is 1.2 to 1.5 times the air inlet cross-sectional area of the air inlet (12).

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