Oil smoke fan blade based on bionic bee wing structure and centrifugal fan

Abstract

The utility model discloses a lampblack fan blade based on a bionic bee wing structure and a centrifugal fan, the blade is of a strip-shaped structure and is provided with a first end and a second end which are oppositely arranged along the length direction, a front edge and a rear edge which are oppositely arranged along the chord length direction, and an air suction surface and an air pressing surface which are oppositely arranged along the thickness direction; the transverse curvatures of the air suction face and the air pressing face are continuously and gradually distributed in the direction from the front edge to the rear edge, and the thickness of the blade is gradually reduced in the direction from the front edge to the rear edge. The front edge is provided with a blunt profile; the rear edge is of a continuous concave-convex structure; a micron-sized pit array is arranged on the surface of the air suction surface; the imitated bee wing rear edge can be flexibly deformed, an airflow boundary layer can be broken, energy loss is further reduced, micron-sized pits can disturb the airflow boundary layer, the adhesion and separation phenomena of airflow on the surface of the blade are reduced, noise generated when the airflow impacts the surface of the blade is reduced, and the energy exchange efficiency between the airflow and the blade is improved. Therefore, the overall performance of the fan is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to an oil fume machine technical field especially based on bionic bee wing structure's oil fume fan blade and centrifugal fan. BACKGROUND

[0002] In the design of oil fume fan, the structure of the blade plays a key role in the aerodynamic performance and noise level of the fan. The oil fume fan blade in the prior art has certain limitations in terms of aerodynamic performance.

[0003] For example, CN211259115U patent proposes a blade, the cross section is a wing type profile, the pressure line and the suction line are designed by a specific curve equation to suppress the flow separation of airflow, eliminate vortex in the blade channel, thereby improving the air performance of the multi-wing centrifugal fan and reducing noise. Again, CN106593950B patent discloses a blade, by setting the flanging on the first side of the blade body, and making the cross section profile of the blade include an arc segment and a bias segment, forming a blunt wing type leading edge to suppress the flow separation of airflow. These designs, although to some extent, improve the air performance of the impeller and reduce the noise, but the performance optimization under certain working conditions still needs to be further improved.

[0004] The blade in the prior art still has certain deficiencies in terms of aerodynamic performance, especially in terms of adaptability and performance optimization under complex airflow conditions when the oil fume machine is working, which needs further innovation and improvement. INVENTION CONTENTS

[0005] The utility model solves the technical problem to provide a kind of air performance better based on bionic bee wing structure's oil fume fan blade.

[0006] The technical scheme that the utility model solves above-mentioned technical problem adopts is as follows: a kind of based on bionic bee wing structure's oil fume fan blade, the blade is long strip structure, with the first end and the second end being oppositely arranged along the length direction, the leading edge and the trailing edge being oppositely arranged along the chord length direction, and the suction surface and the pressure surface being oppositely arranged along the thickness direction;

[0007] The transverse curvature of the suction surface and the pressure surface is continuously and gradually distributed along the leading edge to the trailing edge direction, and the thickness of the blade is gradually reduced from the leading edge to the trailing edge direction;The leading edge has a blunt profile;The trailing edge is a continuous concave-convex structure;The suction surface surface is provided with micron-level pit array.

[0008] The preferred technical scheme that the utility model solves above-mentioned technical problem adopts is as follows: the micron-level pit is formed by laser etching.

[0009] The preferred technical scheme that the utility model solves above-mentioned technical problem adopts is: the diameter range of micron level pit is 50-200 mu m, the depth range is 30-150 mu m.

[0010] The preferred technical scheme that the utility model solves above-mentioned technical problem adopts is: the suction face and the pressure face are coated with oil-repellent coating, and the surface contact angle of the suction face and the pressure face is greater than 150 degrees.

[0011] The preferred technical scheme that the utility model solves above-mentioned technical problem adopts is: the pressure face is provided with a plurality of longitudinal guide grooves.

[0012] The preferred technical scheme that the utility model solves above-mentioned technical problem adopts is: the longitudinal guide groove cross section is a right triangle, and the hypotenuse face of the longitudinal guide groove is located on the side close to the trailing edge.

[0013] The preferred technical scheme that the utility model solves above-mentioned technical problem adopts is: the type line of the pressure face is a logarithmic spiral.

[0014] The preferred technical scheme that the utility model solves above-mentioned technical problem adopts is: the continuous concave-convex structure is a sinusoidal curve.

[0015] The preferred technical scheme that the utility model solves above-mentioned technical problem adopts is: the trailing edge and the first end are connected through an arc transition.

[0016] The preferred technical scheme that the utility model solves above-mentioned technical problem adopts is: a centrifugal fan, comprising a volute and an impeller, the volute comprises at least one air inlet, the impeller comprises a support assembly composed of at least one blade fixing ring and one motor mounting disc; a plurality of interval-distributed oil fume fans blades based on bionic bee wing structure are arranged between the blade fixing ring and the motor mounting disc, the leading edge is located at the inner circle of the support assembly, and the trailing edge is located at the outer circle of the support assembly.

[0017] Compared with the prior art, the utility model has the advantages that: the blade transverse curvature is continuously and gradually distributed from the leading edge to the trailing edge direction, the leading edge has a round blunt profile, and the thickness of the blade gradually decreases from the leading edge to the trailing edge direction, so that the trailing edge is relatively more sharp than the leading edge, which ensures that the blade has sufficient structural strength and rigidity when rotating at high speed, and makes the trailing edge have elastic deformation ability, not only can the blade withstand larger centrifugal force without rigid deformation or damage, but also can enhance the airflow guiding ability, optimize the airflow adhesion, reduce the boundary layer separation, and improve the wind pressure and efficiency.

[0018] The rear edge has a continuous concave-convex structure, which can increase the contact area between the blade and the air, promote the turbulence of the airflow, improve the air suction efficiency and airflow uniformity of the fan, reduce the vortex intensity in the airflow wake, thereby reducing the noise and improving the performance of the fan. In addition, each lobe structure formed by the continuous concave-convex structure enables the rear edge to have elastic deformation capability, so that the blade produces slight vibration in high-speed rotation of the impeller, simulates high-frequency flapping of a bee wing, can break the airflow boundary layer, and further reduces energy loss.

[0019] The suction surface is provided with a micrometer-scale pit array, which can play a role similar to the microstructure of the bee wing surface in bionics when the airflow flows through the blade surface. They can disturb the airflow boundary layer, reduce the adhesion and separation of the airflow on the blade surface, and reduce the noise generated by the airflow impacting the blade surface. At the same time, the existence of the pits can increase the roughness of the blade surface, promote the development of airflow turbulence, improve the energy exchange efficiency between the airflow and the blade, thereby improving the overall performance of the fan, so that the fan can obtain greater air suction and higher air pressure at the same speed. BRIEF DESCRIPTION OF DRAWINGS

[0020] The utility model will be described in further detail below in combination with the drawings and preferred embodiments, but those skilled in the art will appreciate that these drawings are only drawn for the purpose of explaining the preferred embodiments and therefore should not be regarded as limiting the scope of the utility model. In addition, unless specifically indicated, the drawings only schematically show the composition or structure conceptually represented by the described object and can contain exaggerated display, and the drawings are not necessarily drawn to scale.

[0021] Figure 1 It is a schematic diagram of a suitable impeller for an oil smoke fan blade based on a bionic bee wing structure;

[0022] Figure 2 It is a three-dimensional structure of an oil smoke fan blade based on a bionic bee wing structure Figure 1 ;

[0023] Figure 3 It is a three-dimensional structure of an oil smoke fan blade based on a bionic bee wing structure Figure 2 ;

[0024] Figure 4 It is an end sectional view of an oil smoke fan blade based on a bionic bee wing structure. DETAILED DESCRIPTION

[0025] The preferred embodiments of the utility model will be described in detail below with reference to the drawings. Those skilled in the art will appreciate that these descriptions are only descriptive, exemplary, and should not be interpreted as limiting the scope of protection of the utility model.

[0026] It should be noted that like reference numerals refer to like elements throughout the several views of the drawings and that once an element is defined in one drawing that it is not further defined and explained in subsequent drawings.

[0027] In the description of the utility model, it needs to be explained that the terms "upper", "lower", "front", "rear", "left", "right", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship of the utility model product when it is usually placed, which may not be consistent with the orientation of the drawings, and is only for the convenience of describing the utility model based on the same reference and simplifying the description, and therefore cannot be understood as a limitation on the utility model. The "first" and "second" are only for the convenience of understanding the description, and have no other directional meaning, and cannot be regarded as a limitation on the utility model.

[0028] As shown in Figures 1-4 The embodiment provides a double-inlet centrifugal fan, which comprises a volute and an impeller 100, the volute comprises two air inlets, and the impeller 100 comprises a support assembly formed by two blade fixing rings 101 and a motor mounting disc 102; a plurality of oil fume fan blades 103 based on a bionic bee wing structure are arranged at intervals between the blade fixing rings 101 and the motor mounting disc 102. The blade 103 is in a strip-shaped structure, has a first end a and a second end b arranged opposite along a length direction, a leading edge c and a trailing edge d arranged opposite along a chord length direction, and a suction surface e and a pressure surface f arranged opposite along a thickness direction. The first end a and the second end b of the blade 103 are fixed on the two blade fixing rings 101 after the blade 103 passes through the ring part of the motor mounting disc 102, the leading edge c is located at an inner ring of the support assembly, the trailing edge is located at an outer ring of the support assembly, each blade 103 extends in an axial direction, and the suction surface e of one blade 103 and the pressure surface f of an adjacent blade 103 form an airflow passage.

[0029] As shown in Figure 4As shown, the transverse curvature of the blade 103 is continuously and gradually distributed along the direction from the leading edge c to the trailing edge d. The leading edge c has a round blunt profile, and the thickness of the blade 103 gradually decreases from the leading edge c to the trailing edge d, so that the trailing edge d is relatively sharper than the leading edge c. Preferably, the profile of the pressure surface f is a logarithmic spiral. This design conforms to the streamlined thinning rule of the bionic bee wing, which not only ensures that the blade 103 has sufficient structural strength and rigidity when rotating at high speed, but also enables the trailing edge d to have elastic deformation capability, so that the blade 103 can withstand a larger centrifugal force without rigid deformation or damage, and can enhance the airflow guiding capability, optimize the airflow adhesion, reduce the boundary layer separation, and improve the wind pressure and efficiency. The round blunt design of the leading edge c can effectively reduce the separation phenomenon of air at the leading edge c of the blade 103, reduce air resistance, reduce noise and energy loss generated by airflow impact; and the relatively sharp design of the trailing edge d can optimize the airflow separation.

[0030] Further, as shown in Figures 1-3 , the trailing edge d has a continuous concave-convex structure 1. This special structure of the trailing edge d can increase the contact area between the blade 103 and the air, promote the turbulence of the airflow, improve the air suction efficiency and airflow uniformity of the fan, and reduce the vortex intensity in the airflow wake, thereby reducing noise and improving fan performance. In addition, each lobe structure formed by the continuous concave-convex structure 1 enables the trailing edge d to have elastic deformation capability, so that the blade 103 produces slight vibration during high-speed rotation of the impeller 100, simulates high-frequency flapping of the bee wing, and can break the airflow boundary layer, further reducing energy loss.

[0031] In this embodiment, as shown in Figure 2 , the surface of the suction surface e is provided with an array of micron-sized pits 2. These micron-sized pits can be formed by laser etching technology. These micron-sized pits can play a role similar to the surface microstructure of the bionic bee wing when the airflow flows through the surface of the blade 103. They can disturb the airflow boundary layer, reduce the adhesion and separation of the airflow on the surface of the blade 103, and reduce the noise generated by the airflow impacting the surface of the blade 103. At the same time, the existence of the pits can increase the roughness of the surface of the blade 103, promote the development of airflow turbulence, and improve the energy exchange efficiency between the airflow and the blade 103, thereby improving the overall performance of the fan, enabling the fan to obtain a larger air suction volume and higher wind pressure at the same speed.

[0032] Preferably, the diameter of the micron-sized pits ranges from 50 to 200 μm, and the depth ranges from 30 to 150 μm. Such dimensions can effectively capture and guide the airflow boundary layer, without causing excessive surface roughness leading to oil accumulation, and without causing excessive impact on the overall structural strength of the blade 103.

[0033] Further preferably, the suction surface e and the pressure surface f are uniformly coated with an oil-repellent coating, so that the surface contact angle of the suction surface e and the pressure surface f is > 150°. During the operation of the range hood, when the oil fume particles in the kitchen contact the surface of the blade 103, due to the oil-repellent property of the coating, the oil droplets will quickly coagulate and roll off, and will not form a thick layer of oil dirt on the surface of the blade 103. This not only greatly reduces the imbalance and performance degradation problem of the fan caused by the attachment of oil dirt, but also reduces the frequency and difficulty of cleaning the fan. Preferably, the oil-repellent coating is a fluorosilane modified alumina coating, which has excellent oil-repellent performance, and the surface contact angle can reach 160°, which is much larger than the contact angle of ordinary coatings, so that it is difficult for oil droplets to adhere and accumulate on the surface of the blade 103.

[0034] The continuous concave-convex structure 1 of the trailing edge d is in a sinusoidal curve shape, the wavelength is 20-40mm, and the amplitude is 5-15mm. This special structure of the trailing edge d can increase the contact area of the blade 103 and the air, promote the turbulence of the airflow, improve the air suction efficiency and airflow uniformity of the fan, and reduce the vortex intensity in the airflow wake, thereby reducing the noise and improving the performance of the fan.

[0035] As shown in Figure 3 A plurality of longitudinal guide grooves 3 are arranged on the pressure surface f. The cross section of the guide groove is in a right triangle shape, the hypotenuse side is located on one side close to the trailing edge d, the depth of the longitudinal guide groove 3 is not more than one-third of the thickness of the blade 103 at this position, and the included angle between the hypotenuse and the right angle side is 5-15°. Such a guide groove shape design can make the gas lift and the oil dirt descend, and reduce the turbulence and energy loss of the airflow on the pressure surface f.

[0036] Further preferably, the trailing edge d and the first end a or the second end b are connected through an arc-shaped transition part 4, which is formed at one time during the manufacturing process of the blade 103, so as to ensure the smoothness and roundness of the transition area, and there are no sharp corners and protrusions. This arc-shaped transition design can effectively reduce the separation and vortex phenomenon of the airflow at the connection between the trailing edge d and the first end a, and reduce the noise and energy loss generated when the airflow impacts this area. At the same time, during the operation of the fan, the arc-shaped transition can make the stress distribution of the blade 103 more uniform, avoid fatigue damage of the blade 103 caused by stress concentration, and improve the structural reliability and service life of the blade 103.

[0037] A kind of oil fume fan blade based on bionic bee wing structure provided by the utility model is introduced, specific examples are applied in this paper to describe the principle and implementation mode of the utility model, the above embodiment is only used to help understanding the utility model and core idea.It should be pointed out that for ordinary skilled person in the art, without departing from the principle of the utility model, the utility model can be improved and modified in several ways, and these improvements and modifications also fall within the protection scope of the claims of the utility model.

Claims

1. A kind of oil fume fan blade based on bionic bee wing structure, characterized in that: The blade is long strip structure, with first end and second end oppositely arranged along the length direction, leading edge and trailing edge oppositely arranged along the chord length direction, and suction surface and pressure surface oppositely arranged along the thickness direction; The transverse curvature of the suction surface and the pressure surface is continuously and gradually distributed along the direction from the leading edge to the trailing edge, and the thickness of the blade is gradually reduced from the leading edge to the trailing edge;The leading edge has a round blunt profile;The trailing edge has a continuous concave-convex structure;The suction surface is provided with a micron-level pit array. 2.The oil fume fan blade based on bionic bee wing structure according to claim 1, characterized in that: The micron-level pits are formed by laser etching. 3.The oil fume fan blade based on bionic bee wing structure according to claim 1, characterized in that: The diameter of the micron-level pits ranges from 50 to 200 μm, and the depth ranges from 30 to 150 μm. 4.The oil fume fan blade based on bionic bee wing structure according to claim 1, characterized in that: The suction surface and the pressure surface are coated with an oil-repellent coating, and the surface contact angle of the suction surface and the pressure surface is greater than 150°. 5.The oil fume fan blade based on bionic bee wing structure according to claim 1, characterized in that: The pressure surface is provided with a plurality of longitudinal guide grooves. 6.The oil fume fan blade based on bionic bee wing structure according to claim 5, characterized in that: The longitudinal guide groove is in the shape of a right-angled triangle, and the hypotenuse of the longitudinal guide groove is located on the side close to the trailing edge. 7.The oil fume fan blade based on bionic bee wing structure according to claim 5, characterized in that: The pressure surface is in the shape of a logarithmic spiral. 8.The oil fume fan blade based on bionic bee wing structure according to claim 5, characterized in that: The continuous concave-convex structure is a sinusoidal curve. 9.The oil fume fan blade based on bionic bee wing structure according to claim 8, characterized in that: The trailing edge and the first end are connected by an arc transition.

10. A centrifugal fan, characterized by The oil fume fan includes a volute and an impeller, the volute includes at least one air inlet, the impeller includes a support assembly composed of at least one blade fixing ring and a motor mounting disc;A plurality of oil fume fan blades based on bionic bee wing structure as claimed in any one of claims 1-9 are arranged between the blade fixing ring and the motor mounting disc in a spaced manner, the leading edge is located at the inner circle of the support assembly, and the trailing edge is located at the outer circle of the support assembly.

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