Volute-free axial flow exhaust fan

Abstract

The utility model belongs to the technical field of fan impellers, and particularly relates to a volute-free axial flow exhaust fan which comprises an axial flow shell, a motor and an impeller, the impeller is a spherical centrifugal impeller, and the spherical centrifugal impeller comprises a motor shaft installation piece located in the center and a motor shaft installation piece arranged coaxially with the motor shaft installation piece. At least one hub piece is arranged along the thickness direction, the hub piece and the motor shaft mounting piece are connected through a plurality of blades, the adjacent hub pieces are connected through a plurality of blades, a spherical body structure is formed, and the blades are arranged at intervals, so that the spherical centrifugal impeller is adopted, the axial flow direction is realized, the installation is convenient, the wind pressure and the flow rate are ensured, and the service life of the impeller is prolonged. And the spherical centrifugal impeller adopts a spherical structure, so that the air outlet surface is far larger than the air inlet surface, and the noise can be effectively reduced under the condition of the same power and air volume.

Description

Technical Field

[0001] The utility model belongs to the technical field of fan impellers, and particularly relates to a volute-free axial flow exhaust fan. Background Art

[0002] Common fans are roughly divided into two types according to the direction of gas flow, namely centrifugal fans and axial flow fans, and each has its own advantages and disadvantages: 1. Advantages of centrifugal fans: centrifugal fans have high wind pressure and low noise; 2. Disadvantages of centrifugal fans: the need to install a volute changes the flow direction of the medium in the air duct, reduces energy efficiency, and has high energy consumption; 3. Advantages of axial flow fans: axial flow fans do not reverse the flow direction of the medium in the air duct, are easy to install, and can be installed in the air duct or at the front end of the air duct outlet; 4. Disadvantages of axial flow fans: relatively low wind pressure; How to combine the advantages of the two is the direction of our research and development.

[0003] Generally, the greater the air volume and power, the higher the noise will be. Therefore, how to reduce noise under the same air volume and power is our research and development direction. Utility Model Content

[0004] The utility model provides a volute-free axial flow exhaust fan, which can solve the problems pointed out in the background technology.

[0005] A volute-free axial flow exhaust fan comprises an axial flow casing, a motor and an impeller, wherein the impeller is a spherical centrifugal impeller, which is arranged at one end of the axial flow casing and driven by a motor, and the spherical centrifugal impeller comprises a motor shaft mounting part located at the center and at least one hub piece coaxially arranged with the motor shaft mounting part and arranged along the thickness direction, wherein the hub piece and the motor shaft mounting part and adjacent hub pieces are connected by a plurality of blades to form a spherical structure, and there are intervals between the blades.

[0006] Preferably, the diameter of the hub piece increases from the inside to the outside, and the diameter of the innermost hub piece is larger than the outer diameter of the motor shaft mounting component to form a spherical structure.

[0007] Preferably, the number of the hub plates is two.

[0008] Preferably, the angle between the hub plate and the impeller rotation plane is 15-50 degrees.

[0009] Beneficial effect: The utility model provides a volute-free axial flow exhaust fan, which adopts a spherical centrifugal impeller to realize axial flow direction, combines the advantages of centrifugal impellers and axial flow impellers, and makes the best use of their strengths while avoiding their weaknesses. It is easy to install, ensures wind pressure and flow, and reduces energy consumption.

[0010] The spherical centrifugal impeller adopts a spherical structure, which makes the air outlet surface much larger than the air inlet surface, thereby effectively reducing noise under the condition of equal power and air volume. The hub has an inclined air outlet angle, which further increases the air outlet surface and reduces noise. The spherical setting can reasonably utilize space and the thickness of the impeller can also be relatively reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a structural schematic diagram of the utility model.

[0012] Figure 2 This is a schematic diagram of the structure of the spherical centrifugal impeller of the utility model.

[0013] Figure 3 This is a schematic diagram of the main view of the spherical centrifugal impeller of the utility model.

[0014] Description of reference numerals:

[0015] Reference numerals in the figure: axial flow casing 1; motor 2; impeller 3; motor shaft mounting member 31; hub piece 32; blade 33; interval 34. DETAILED DESCRIPTION

[0016] A specific implementation of the present utility model is described in detail below in conjunction with the accompanying drawings, but it should be understood that the protection scope of the present utility model is not limited by the specific implementation mode.

[0017] Embodiment 1:

[0018] like Figure 1-3 As shown, a volute-free axial flow exhaust fan includes an axial flow casing 1, a motor 2 and an impeller 3. The impeller 3 is a spherical centrifugal impeller, which is arranged at one end of the axial flow casing 1. The motor 2 is built in the axial flow casing 1 and is connected to the spherical centrifugal impeller through the motor shaft. The spherical centrifugal impeller is driven to rotate by the motor 2. The spherical centrifugal impeller includes a motor shaft mounting member 31 located at the center and at least one hub piece 32 coaxially arranged with the motor shaft mounting member 31 and arranged along the thickness direction. The motor shaft mounting member 31 is used to be connected to the motor shaft. The hub piece 32 and the motor shaft mounting member 31 and adjacent hub pieces 32 are connected by a plurality of blades 33 to form a spherical structure. There are gaps 34 between the blades 33. One side of the motor shaft mounting member 31 is an air inlet end, and the side away from the motor shaft mounting member 31 is an air outlet end.

[0019] Specifically, the diameter of the hub piece 32 increases from the inside to the outside, and the diameter of the innermost hub piece 32 is larger than the outer diameter of the motor shaft mounting member 31 to form a spherical structure.

[0020] In this embodiment, the number of the hub plates 32 may be two.

[0021] In some embodiments, the included angle between the hub plate 32 and the impeller rotation plane is 15-50 degrees.

[0022] The above disclosures are only several specific embodiments of the present invention. However, the embodiments of the present invention are not limited thereto. Any changes that can be conceived by those skilled in the art should fall within the protection scope of the present invention.

Claims

1. A volute-free axial flow exhaust fan, comprising an axial flow casing (1), a motor (2) and an impeller (3), characterized in that: The impeller (3) is a spherical centrifugal impeller, which is arranged at one end of the axial flow casing (1) and driven by a motor (2). The spherical centrifugal impeller comprises a motor shaft mounting member (31) located at the center and at least one hub piece (32) arranged coaxially with the motor shaft mounting member (31) and arranged along the thickness direction. The hub piece (32) and the motor shaft mounting member (31) and adjacent hub pieces (32) are connected by a plurality of blades (33) to form a spherical structure, and there are gaps (34) between the blades (33).

2. The volute-free axial flow exhaust fan according to claim 1, characterized in that: The diameter of the hub piece (32) increases from the inside to the outside, and the diameter of the innermost hub piece (32) is greater than the outer diameter of the motor shaft mounting component (31), so as to form a spherical structure.

3. The volute-free axial flow exhaust fan according to claim 2, characterized in that: The number of the hub plates (32) is two.

4. A volute-free axial flow exhaust fan according to any one of claims 1 to 3, characterized in that: The included angle between the hub plate (32) and the impeller rotation plane is 15-50 degrees.

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