CN221170103U

CN221170103U - Backward centrifugal wind wheel with winglet and centrifugal fan

Info

Publication number: CN221170103U
Application number: CN202322830958.0U
Authority: CN
Inventors: 李嘉盛; 梁健潮; 刘爱瑜; 李浪镔; 覃万翔
Original assignee: Guangdong Sunwill Precising Plastic Co Ltd
Current assignee: Guangdong Sunwill Precising Plastic Co Ltd
Priority date: 2023-10-20
Filing date: 2023-10-20
Publication date: 2024-06-18
Anticipated expiration: 2033-10-20

Abstract

The utility model discloses a rear centrifugal wind wheel with winglets and a centrifugal fan, wherein the rear centrifugal wind wheel with winglets comprises: an air guide ring; the wheel disc is coaxially arranged with the air guide ring and is positioned below the air guide ring; the blades are arranged between the wind guide ring and the wheel disc, a plurality of blades are circumferentially distributed around the axis of the wheel disc, each blade comprises a pressure surface and a suction surface, a plurality of guide winglets are arranged on the pressure surface and/or the suction surface at intervals along the extending direction of the tail edge of each blade. When gas flows through the trailing edge of the blade, the guiding winglet can delay boundary layer separation phenomenon, accelerate flow blending and energy diffusion of wake, change unsteady vortex structure and vortex shedding frequency, change the ring quantity of the original blade around the wing, further influence the aerodynamic characteristic and the flow field characteristic of the blade around, thereby improving flow efficiency and reducing noise.

Description

Backward centrifugal wind wheel with winglet and centrifugal fan

Technical Field

The utility model relates to the technical field of centrifugal fans, in particular to a backward centrifugal wind wheel with winglets and a centrifugal fan.

Background

In the ventilation industry, a backward centrifugal fan is generally used in some occasions where the flow direction of a fluid medium is required to be changed from an axial direction to a circumferential direction. When the gas flows through the tail edge of the blade, the flow separation phenomenon on the surface of the blade is increased sharply, so that larger vortex and backflow are generated. These eddy and backflow components in the fluid tend to increase eddy noise, thereby increasing the overall noise amplitude of the blower.

Disclosure of utility model

The present utility model aims to solve at least one of the technical problems in the related art to some extent. Therefore, the utility model provides a backward centrifugal wind wheel with winglets and a centrifugal fan.

In a first aspect, an embodiment of the present utility model provides a winglet-equipped backward centrifugal wind wheel, including:

An air guide ring;

The wheel disc is coaxially arranged with the air guide ring and is positioned below the air guide ring;

The blades are arranged between the wind guide ring and the wheel disc, a plurality of blades are circumferentially distributed around the axis of the wheel disc, each blade comprises a pressure surface and a suction surface, a plurality of guide winglets are arranged on the pressure surface and/or the suction surface at intervals along the extending direction of the tail edge of each blade.

The backward centrifugal wind wheel with the winglet provided by the embodiment of the utility model has at least the following technical effects: when gas flows through the trailing edge of the blade, the guiding winglet can delay boundary layer separation phenomenon, accelerate flow blending and energy diffusion of wake, change unsteady vortex structure and vortex shedding frequency, change the ring quantity of the original blade around the wing, further influence the aerodynamic characteristic and the flow field characteristic of the blade around, thereby improving flow efficiency and reducing noise.

According to some embodiments of the utility model, the winglet extends in a horizontal direction.

According to some embodiments of the utility model, the winglet is raised gradually relative to the blade in a direction away from the disk axis.

According to some embodiments of the utility model, the length of the guiding winglet is a, satisfying: a is more than or equal to 5mm and less than or equal to 10mm.

According to some embodiments of the utility model, the length of the guiding winglet is a, the maximum height of the guiding winglet from the blade surface is B, satisfying: b is more than or equal to 0.3A and less than or equal to 0.8A.

According to some embodiments of the utility model, the thickness of the guiding winglet is D, satisfying: d is more than or equal to 0.3A and less than or equal to 0.5A.

According to some embodiments of the utility model, the guiding winglet is rounded from the highest position of the blade surface, the diameter of the rounded is C, and the following conditions are satisfied: c is more than or equal to 0.1A and less than or equal to 0.3A.

According to some embodiments of the utility model, the leading edge of the guiding winglet is composed of two first arcs, the diameter of the first arc is F, the trailing edge of the guiding winglet is composed of two second arcs, the diameter of the second arc is E, and the following conditions are satisfied: f is more than or equal to 0.2A and less than or equal to 0.4A, E is more than or equal to 0.1A and less than or equal to 0.2A.

According to some embodiments of the utility model, the vertical distance between two adjacent guiding winglets is G, which satisfies the following conditions: g is more than or equal to 0.5A and less than or equal to 2A.

In a second aspect, an embodiment of the present utility model further provides a centrifugal fan, including a backward centrifugal wind wheel with winglets according to the embodiment of the first aspect of the present utility model.

The centrifugal fan provided by the embodiment of the utility model has at least the following technical effects: the centrifugal fan adopts the backward centrifugal wind wheel with the winglets, when gas flows through the tail edges of the blades, the diversion winglets can delay boundary layer separation phenomenon, accelerate flow blending and energy diffusion of wake, change unsteady vortex structure and vortex shedding frequency, change the ring quantity of the wings of the original blades, further influence the aerodynamic characteristics and the flow field characteristics of the blades, thereby improving flow efficiency and reducing noise.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.

Drawings

The foregoing and/or additional aspects and advantages of the utility model will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:

FIG. 1 is a schematic illustration of the structure of a winglet-based backward centrifugal wind turbine in accordance with some embodiments of the utility model;

FIG. 2 is an enlarged schematic view at K of FIG. 1;

FIG. 3 is a front view of a winglet-bearing aft centrifugal wind wheel in accordance with some embodiments of the utility model;

FIG. 4 is a schematic dimensional view of a winglet according to some embodiments of the utility model;

FIG. 5 is a schematic illustration of the dimensions of a winglet projected onto a blade in accordance with some embodiments of the utility model.

Reference numerals:

Wind-guiding circle 100, rim plate 110, blade 120, pressure face 121, suction face 122, water conservancy diversion winglet 130, first pitch line 131, second pitch line 132.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model.

In the description of the present utility model, it should be understood that references to orientation descriptions, such as directions of up, down, left, right, etc., are based on the orientation or positional relationship shown in the drawings, are merely for convenience of description and simplification of the description, and do not indicate or imply that the apparatus or element in question must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the utility model.

In the description of the present utility model, plural means two or more, and greater than, less than, exceeding, etc. are understood to not include the present number, and the above, below, within, etc. are understood to include the present number. The description of the first and second is for the purpose of distinguishing between technical features only and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present utility model, unless explicitly defined otherwise, terms such as arrangement, installation, connection, etc. should be construed broadly and the specific meaning of the terms in the present utility model can be reasonably determined by a person skilled in the art in combination with the specific contents of the technical scheme.

Embodiments of the present utility model will be further described below with reference to the accompanying drawings.

According to some embodiments of the present utility model, referring to fig. 1-3, a winglet-based aft centrifugal wind rotor includes a wind deflector 100, a disk 110, and blades 120. The wheel disc 110 is coaxially arranged with the wind-guiding ring 100, the wheel disc 110 is positioned below the wind-guiding ring 100, and the axial direction of the wheel disc 110 is the up-down direction. The blades 120 are arranged between the wind guide ring 100 and the wheel disc 110, the upper ends of the blades 120 are fixedly connected with the wind guide ring 100, the lower ends of the blades 120 are fixedly connected with the wheel disc 110, and a plurality of blades 120 are circumferentially distributed around the axis of the wheel disc 110. The blade 120 comprises a pressure surface 121 and a suction surface 122, wherein the pressure surface 121 or the suction surface 122 is provided with a guiding winglet 130, or the pressure surface 121 and the suction surface 122 are provided with guiding winglets 130. A plurality of guiding winglets 130 on the same pressure surface 121 or on the same suction surface 122 are arranged at intervals along the extension direction of the trailing edge of the blade 120, i.e. the side of the blade 120 facing away from the axis of the disk 110.

It can be appreciated that when the gas flows through the trailing edge of the blade 120, the guiding winglet 130 can delay the boundary layer separation phenomenon, accelerate the flow blending and energy diffusion of the wake, change the unsteady vortex structure and vortex shedding frequency, change the ring quantity of the original blade 120 around the wing, and further influence the aerodynamic characteristics and the flow field characteristics of the blade 120, thereby improving the flow efficiency and reducing the noise.

It will also be appreciated that when both the pressure side 121 and the suction side 122 are provided with the winglet 130, the above effect is more pronounced, and the secondary turbulence jet induced by the winglet 130 and the suction side 122 side reverse vortex pair change the amount of the ring around the original blade 120, improving the flow efficiency and reducing noise.

Preferably, the winglet 130 extends in a horizontal direction to accommodate the direction of flow of the gas.

According to some embodiments of the present utility model, referring to fig. 2-4, the winglet 130 is gradually raised relative to the blade 120 in a direction away from the axis of the disk 110 to ensure that the winglet 130 is capable of delaying boundary layer separation. Referring to FIG. 4, the winglet 130 is gradually raised from right to left relative to the blade 120, and the axis of the disk 110 is to the right of the winglet 130.

Preferably, referring to FIG. 4, the winglet 130 has a length A that satisfies: a is more than or equal to 5mm and less than or equal to 10mm. Ensuring that the winglet 130 directs the flow of gas while avoiding the winglet 130 from becoming too long and reducing the rate of gas flow.

Preferably, referring to fig. 4, the length of the guiding winglet 130 is a, the maximum height of the guiding winglet 130 from the surface of the blade 120 is B, and the following conditions are satisfied: b is more than or equal to 0.3A and less than or equal to 0.8A. Ensuring that the winglet 130 is capable of directing the gas flow while avoiding the winglet 130 from being too high to reduce the gas flow rate.

Preferably, referring to fig. 5, the thickness D of the winglet 130 satisfies: d is more than or equal to 0.3A and less than or equal to 0.5A. Ensuring that the winglet 130 is capable of directing the gas flow while avoiding the winglet 130 from being too thick to reduce the gas flow rate.

Preferably, referring to fig. 4, the highest position of the guiding winglet 130 from the surface of the blade 120 is a rounded portion, and the diameter of the rounded portion is C, so that: c is more than or equal to 0.1A and less than or equal to 0.3A. Ensuring that the winglet 130 is able to direct the flow of gas while avoiding a reduction in the gas flow rate.

According to some embodiments of the present utility model, referring to fig. 4 and 5, the leading edge of the guiding winglet 130 is composed of two first arcs 131, the first arc 131 having a diameter F, the trailing edge of the guiding winglet 130 is composed of two second arcs 132, the second arc 132 having a diameter E, satisfying: f is more than or equal to 0.2A and less than or equal to 0.4A, E is more than or equal to 0.1A and less than or equal to 0.2A. Ensuring that the winglet 130 is able to direct the flow of gas while avoiding a reduction in the gas flow rate.

It will be appreciated that the leading edge of the winglet 130, i.e., the end of the winglet 130 that is adjacent to the axis of the disk 110, and the trailing edge of the winglet 130, i.e., the end of the winglet 130 that is adjacent to the trailing edge of the blade 120.

According to some embodiments of the present utility model, referring to fig. 3, the vertical spacing of two adjacent winglets 130 is G, satisfying: g is more than or equal to 0.5A and less than or equal to 2A. To ensure that the density of the winglets 130 is sufficiently high to direct the gas flow and to avoid excessive density from impeding the gas flow.

In the description of the present specification, reference to the term "some embodiments" means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the utility model. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present utility model have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the utility model, the scope of which is defined by the claims and their equivalents.

Claims

1. A winglet-bearing rearward centrifugal wind turbine comprising:

A wind-guiding ring (100);

The wheel disc (110) is coaxially arranged with the air guide ring (100), and the wheel disc (110) is positioned below the air guide ring (100);

The blade (120) is arranged between the wind guide ring (100) and the wheel disc (110), a plurality of blades (120) are circumferentially distributed around the axis of the wheel disc (110), the blade (120) comprises a pressure surface (121) and a suction surface (122), the pressure surface (121) and/or the suction surface (122) are/is provided with guide winglets (130), and a plurality of guide winglets (130) are arranged at intervals along the extending direction of the tail edge of the blade (120).

2. The winglet-based backward centrifugal wind turbine of claim 1, wherein the winglet (130) extends in a horizontal direction.

3. The winglet-based backward centrifugal wind turbine of claim 2, wherein the guiding winglet (130) gradually bulges relative to the blade (120) in a direction away from the axis of the wheel (110).

4. A winglet-bearing backward centrifugal wind wheel according to claim 3, wherein the length of the guiding winglet (130) is a, satisfying: a is more than or equal to 5mm and less than or equal to 10mm.

5. A winglet-bearing backward centrifugal wind wheel according to claim 3, wherein the length of the guiding winglet (130) is a, the maximum height of the guiding winglet (130) from the surface of the blade (120) is B, satisfying: b is more than or equal to 0.3A and less than or equal to 0.8A.

6. A winglet-bearing backward centrifugal wind wheel according to claim 3, wherein the thickness D of the guiding winglet (130) is such that: d is more than or equal to 0.3A and less than or equal to 0.5A.

7. A winglet-bearing backward centrifugal wind wheel according to claim 3, wherein the guide winglet (130) is rounded from the highest of the blade (120) surface, the diameter of the rounded being C, satisfying: c is more than or equal to 0.1A and less than or equal to 0.3A.

8. A winglet-bearing backward centrifugal wind wheel according to claim 3, wherein the leading edge of the guiding winglet (130) consists of two first arcs (131), the diameter of the first arc (131) is F, the trailing edge of the guiding winglet (130) consists of two second arcs (132), the diameter of the second arc (132) is E, the following is satisfied: f is more than or equal to 0.2A and less than or equal to 0.4A, E is more than or equal to 0.1A and less than or equal to 0.2A.

9. A winglet-bearing backward centrifugal wind wheel according to claim 3, wherein the vertical spacing between two adjacent winglets (130) is G, satisfying: g is more than or equal to 0.5A and less than or equal to 2A.

10. A centrifugal fan comprising a winglet-bearing backward centrifugal wind wheel according to any one of claims 1 to 9.