CN220850128U

CN220850128U - Middle section fan blade and cross-flow fan

Info

Publication number: CN220850128U
Application number: CN202322468624.3U
Authority: CN
Inventors: 叶涛; 覃万翔; 王汉波; 韦宏茂; 梁燕好
Original assignee: Guangdong Sunwill Precising Plastic Co Ltd
Current assignee: Guangdong Sunwill Precising Plastic Co Ltd
Priority date: 2023-09-11
Filing date: 2023-09-11
Publication date: 2024-04-26
Anticipated expiration: 2033-09-11

Abstract

The utility model discloses a middle section fan blade and a cross-flow fan, wherein the middle section fan blade comprises: the middle plate is annular; the blades are fixedly connected to one side of the middle plate, a plurality of blades are circumferentially distributed around the axis of the middle plate, a stepped structure is arranged on one side, away from the axis of the middle plate, of each blade, each stepped structure comprises multiple steps, and the steps are axially arranged and gradually close to the axis of the middle plate in the direction approaching to the middle plate; in the rotation process of the middle section fan blade, the blade can generate sound waves to the air flow so as to intensify resonance, the ladder structure of the blade can relieve the resonance generated by the air flow impacting the sound waves, the phase of the sound waves generated by the air flow impacting of the blade is controlled, the coherence of the sound waves is avoided, and therefore the pneumatic noise of the middle section fan blade is reduced.

Description

Middle section fan blade and cross-flow fan

Technical Field

The utility model relates to the technical field of cross-flow fans, in particular to a middle-section fan blade and a cross-flow fan.

Background

The cross flow wind wheel has the characteristics of simple structure, small volume, stable generated airflow, higher dynamic pressure coefficient, longer arrival distance and the like, and is widely applied to ventilation equipment such as air conditioners and the like.

The cross flow wind wheel is mainly applied to an indoor wall-mounted structure in the field of air conditioning, so that the requirement on noise control is relatively high. In the working process of the cross-flow wind wheel, the fan blades move relative to the air flow, and the pressure born by the windward side and the leeward side is different. The pneumatic pressure and the airflow speed along the circumferential direction at the outlet of the blade channel of the rotary impeller are greatly changed, and the rotary blade channel passes through the narrow volute tongue, so that periodic pressure and speed pulsation can occur, and rotary noise is generated; the noise also includes vibrations of different frequencies of the surrounding environment caused by the movement of the blades. When the blade passes through the volute tongue or the frequency of generating pressure and speed pulses is the same as or has common divisor with the frequency of surrounding environment vibration, the vibration of the blade and the surrounding environment vibration can be overlapped at certain specific moments to generate resonance, so that the rotation noise of the cross flow wind wheel is increased.

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 middle-section fan blade and a cross-flow fan.

In a first aspect, an embodiment of the present utility model provides a middle section fan blade, where the middle section fan blade includes:

The middle plate is annular;

The blade, the one end fixed connection of blade in one side of medium plate, a plurality of blade is around medium plate axis circumference distributes, the blade is kept away from one side of medium plate axis is equipped with the ladder structure, the ladder structure includes multistage step, multistage the step along axial arrangement and to be close to in the direction of medium plate is close to gradually the medium plate axis.

The middle section fan blade provided by the embodiment of the utility model has at least the following technical effects: in the rotation process of the middle section fan blade, the blade can generate sound waves to the air flow so as to intensify resonance, the ladder structure of the blade can relieve the resonance generated by the air flow impacting the sound waves, the phase of the sound waves generated by the air flow impacting of the blade is controlled, the coherence of the sound waves is avoided, and therefore the pneumatic noise of the middle section fan blade is reduced.

According to some embodiments of the utility model, the distance between two adjacent steps is H, which satisfies the following: h is more than or equal to 3mm and less than or equal to 7mm.

According to some embodiments of the utility model, the pitch of every two adjacent steps is equal.

According to some embodiments of the utility model, the step profile of the step comprises a large end airfoil surface and a small end airfoil surface, the small end airfoil surface being located within the large end airfoil surface, the leading edge of the small end airfoil surface coinciding with the leading edge of the large end airfoil surface.

According to some embodiments of the utility model, the trailing edge radius of the large end airfoil surface is R1, and the trailing edge radius of the small end airfoil surface is R2, satisfying: 0.6R1R 2 is less than or equal to 0.62R1.

According to some embodiments of the utility model, the chord length of the large end airfoil surface is L1, and the large end length of the step is L2, which satisfies the following conditions: 0.25L1 is less than or equal to L2 is less than or equal to 0.4L1.

According to some embodiments of the utility model, the step has a small end length L3, satisfying: 0.7L2 is less than or equal to L3 is less than or equal to 0.85L2.

According to some embodiments of the utility model, the plurality of blades are evenly distributed circumferentially about the midplane axis.

According to some embodiments of the utility model, the number of blades is N, satisfying: n is more than or equal to 30 and less than or equal to 40.

In a second aspect, an embodiment of the present utility model further provides a cross-flow fan, including the middle-section fan blade according to the embodiment of the first aspect of the present utility model.

The cross-flow fan provided by the embodiment of the utility model has at least the following technical effects: the cross-flow fan adopts the middle section fan blade, in the rotation process of the middle section fan blade, the impact of the fan blade on the air flow generates sound waves so as to intensify resonance, the ladder structure of the fan blade can relieve the resonance generated by the impact of the air flow on the sound waves, the phase of the fan blade on the impact of the air flow generates the sound waves is controlled, the coherence of the sound waves is avoided, and therefore the pneumatic noise of the middle section fan blade is reduced.

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 view of a middle blade according to some embodiments of the present utility model;

FIG. 2 is a schematic view of another angle of a middle blade according to some embodiments of the present utility model;

FIG. 3 is an enlarged schematic view at A of FIG. 2;

FIG. 4 is a schematic illustration of the connection of a midplane and blade of some embodiments of the utility model;

FIG. 5 is a bottom view of a middle section blade according to some embodiments of the utility model;

fig. 6 is a schematic dimensional view of steps according to some embodiments of the utility model.

Reference numerals:

Middle plate 100, blade 110, stepped structure 120, step 130, large end airfoil 131, small end airfoil 132, suction side 141, pressure side 142.

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 the direction or positional relationship indicated with respect to the description of the orientation, such as up, down, etc., is based on the direction or positional relationship shown in the drawings, is merely for convenience of describing the present utility model and simplifying the description, and does not indicate or imply that the apparatus or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present 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 utility model, referring to fig. 1-5, the middle section blade comprises a middle plate 100 and a blade 110. The middle plate 100 is ring-shaped. The upper ends of the blades 110 are fixedly coupled to the lower side of the middle plate 100, and the plurality of blades 110 are circumferentially distributed around the axis of the middle plate 100. The side of the blade 110 remote from the axis of the midplane 100 is provided with a stepped structure 120. Referring to fig. 2 to 4, the stepped structure 120 includes a plurality of steps 130, the plurality of steps 130 being arranged in an axial direction and gradually approaching the axis of the middle plate 100 in a direction approaching the middle plate 100, i.e., the plurality of steps 130 gradually approaching the axis of the middle plate 100 from bottom to top.

In the rotation process of the middle section fan blade, the blade 110 can generate sound waves to impact the air flow so as to intensify resonance, the ladder structure 120 of the blade 110 can relieve resonance generated by the air flow impacting the sound waves, the phase of the sound waves generated by the air flow impacting of the blade 110 is controlled, the coherence of the sound waves is avoided, and therefore the pneumatic noise of the middle section fan blade is reduced.

According to some embodiments of the present utility model, referring to fig. 4, the spacing between two adjacent steps 130 is H, satisfying: h is more than or equal to 3mm and less than or equal to 7mm. To ensure that the stepped structure 120 is effective in interfering with sound waves generated by the airflow, reducing aerodynamic noise.

Preferably, the spacing of every adjacent two steps 130 is equal. Or the spacing of every adjacent two steps 130 may be unequal.

According to some embodiments of the utility model, referring to fig. 6, the step surface of the step 130 includes a large end airfoil surface 131 and a small end airfoil surface 132, the small end airfoil surface 132 being located within the large end airfoil surface 131, the leading edge of the small end airfoil surface 132 coinciding with the leading edge of the large end airfoil surface 131.

It will be appreciated that, referring to fig. 6, K1 is a trailing edge end point of the large end airfoil 131, K5 is a leading edge end point of the large end airfoil 131, K2 is a trailing edge end point of the small end airfoil 132, a leading edge of the small end airfoil 132 coincides with a leading edge of the large end airfoil 131, K3 is a separation point of the large end airfoil 131 and the small end airfoil 132 on the suction surface 141 side from the leading edge toward the trailing edge, and K4 is a separation point of the large end airfoil 131 and the small end airfoil 132 on the pressure surface 142 side. The dashed line in fig. 6 represents the portion of the winglet surface 132 near the trailing edge and not coincident with the large end airfoil surface 131.

According to some embodiments of the utility model, referring to fig. 6, the trailing edge radius of the large end airfoil surface 131 is R1 and the trailing edge radius of the small end airfoil surface 132 is R2, satisfying: 0.6R1R 2 is less than or equal to 0.62R1. Thereby ensuring that the step 130 has a sufficient area to apply work to the gas so as to interfere with sound waves generated by the gas, and reducing noise.

According to some embodiments of the utility model, the chord length of the large end airfoil 131 is L1 and the large end length of the step 130 is L2, satisfying: 0.25L1 is less than or equal to L2 is less than or equal to 0.4L1. Thereby ensuring that the step 130 has a sufficient area to apply work to the gas so as to interfere with sound waves generated by the gas, and reducing noise.

It should be noted that, the length of the connection line of K1K5 is the chord length L1 of the large end airfoil 131, the connection line of K3 perpendicular to K1K5 and the intersection point of K6, the connection line of K1K6 is the large end length L2 of the step 130.

According to some embodiments of the utility model, the step 130 has a small end length L3, satisfying: 0.7L2 is less than or equal to L3 is less than or equal to 0.85L2. Thereby ensuring that the step 130 has a sufficient area to apply work to the gas so as to interfere with sound waves generated by the gas, and reducing noise.

It should be noted that, the line perpendicular to K3K6 is used as the line K2, the intersection point is K7, and the line K2K7 is the small end length L3 of the step 130.

Preferably, the plurality of vanes 110 are evenly distributed circumferentially about the axis of the midplane 100 to facilitate directing a uniform flow of gas.

Preferably, the number of blades 110 is N, satisfying: n is more than or equal to 30 and less than or equal to 40, so that the blades 110 are enough to ensure enough working capacity, and meanwhile, the influence of too small space between adjacent blades 110 to air output caused by too many blades 110 is avoided.

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 middle section fan blade, characterized by comprising:

A middle plate (100), wherein the middle plate (100) is annular;

Blade (110), one end fixed connection of blade (110) in one side of medium plate (100), a plurality of blade (110) are around medium plate (100) axis circumference distributes, one side that medium plate (100) axis was kept away from to blade (110) is equipped with ladder structure (120), ladder structure (120) include multistage step (130), multistage step (130) are along axial arrangement and to be close to in the direction of medium plate (100) is close to gradually medium plate (100) axis.

2. The middle blade according to claim 1, wherein the distance between two adjacent steps (130) is H, which satisfies the following conditions: h is more than or equal to 3mm and less than or equal to 7mm.

3. The middle blade according to claim 1, wherein the pitch of every two adjacent steps (130) is equal.

4. The middle section fan blade according to claim 1, wherein the step surface of the step (130) comprises a large end airfoil surface (131) and a small end airfoil surface (132), the small end airfoil surface (132) is located in the large end airfoil surface (131), and a front edge of the small end airfoil surface (132) coincides with a front edge of the large end airfoil surface (131).

5. The middle blade according to claim 4, wherein the trailing edge radius of the large end airfoil surface (131) is R1 and the trailing edge radius of the small end airfoil surface (132) is R2, satisfying: 0.6R1R 2 is less than or equal to 0.62R1.

6. The middle blade according to claim 5, wherein the chord length of the large end airfoil surface (131) is L1, and the large end length of the step (130) is L2, satisfying: 0.25L1 is less than or equal to L2 is less than or equal to 0.4L1.

7. The middle blade according to claim 6, wherein the small end length of the step (130) is L3, which satisfies the following conditions: 0.7L2 is less than or equal to L3 is less than or equal to 0.85L2.

8. The middle blade according to claim 1, wherein a plurality of the blades (110) are evenly distributed circumferentially about the middle plate (100) axis.

9. The middle section fan blade according to claim 1, wherein the number of the blades (110) is N, which satisfies: n is more than or equal to 30 and less than or equal to 40.

10. A cross-flow fan comprising a middle section fan blade according to any one of claims 1 to 9.