JP3164940U - Fan structure - Google Patents

Abstract

An improved fan structure in which rotation of a blade piece is made smoother, labor-saving and power-saving, and the heat sink efficiency of the fan is improved. The fan structure includes a wheel 20 and a plurality of blade pieces 30 extending from the outer edge of the wheel, and an air flow generated when the fan 1 rotates forms a boundary layer on the blade piece surface, and each blade piece is formed. Are provided with a plurality of polygonal recesses (grooves) 33, and when the airflow flows through the respective recesses, turbulent flow stagnating in the recesses is generated, and a plurality of turbulent flows are collected, and the blade surface and the boundary layer are A single air film is formed between them. Thereby, the separation point of the boundary layer is extended, and the effect of reducing frictional resistance and blade noise is achieved. [Selection] Figure 1

Description

  The present invention relates to a fan, and more particularly, to an improved winglet structure capable of reducing airflow resistance.

  A heat sink system applied to a conventional computer host or other electronic equipment removes hot air to the outside by the forced air flow generated by the heat sink air, and the fan is usually installed for a long time operation, so the fan operation Efficiency is closely related to the heat sink effect, and also causes discomfort to the user if the noise during the fan rotation is too loud.

  In general, a fan generates an air current immediately during operation, and forms a thinner layer when the air current flows on the blade surface, which is referred to as a boundary layer, The layer generates turbulence after passing the separation point from the winglet, the turbulent flow vibrates the winglet, generates noise, and creates a frictional resistance between the rear winglet surface and the airflow, Furthermore, it affects the operating efficiency of the fan. However, based on research, flow field control has been shown to be one of the ways to reduce frictional drag and extend the boundary layer separation point, but changing the flow field near the object surface Achieving a reduction in frictional resistance by this is the motive behind the inventor's idea.

JP-A-5-340390

  It is an object of the present invention to provide an improved fan structure that achieves the effect of reducing frictional resistance and reducing blade noise.

  Another object of the present invention is to provide an improved fan structure that makes the rotation of the blades smoother, labor-saving, and power-saving, and improves the heat sink efficiency of the fan.

  In order to achieve the above object, a fan structure provided by the present invention includes a wheel and a plurality of blades extending from an outer edge of the wheel, and the air flow generated when the fan rotates rotates on the surface of the blades. Forming a boundary layer, providing each of the blades with a plurality of polygonal recesses, generating a turbulent flow stagnating in the recesses when the airflow flows through the recesses, collecting a plurality of turbulences; One layer of air film is formed between the blade surface and the boundary layer.

  Another object of the present invention is to form a neck portion having a concave accommodation space on the outer edge of the base, which is advantageous for allowing more external air to enter the intake side, and during exhaust on the exhaust side. It is an object of the present invention to provide a fan structure that is advantageous in reducing the resistance force of the fan.

  Another object of the present invention is that the multi-sided concave groove of the wing piece is composed of a mixture of polygons such as a triangle, a quadrilateral, an octagon, etc. It is an object of the present invention to provide a fan structure that is advantageous for generating turbulent flow in a side groove.

  Compared with the conventional fan structure, the improved fan structure of the present invention has a plurality of multi-sided concave grooves laid on the wing piece, and the airflow flowing on the surface of the wing piece is on the side of the multi-sided groove. Turbulent flow is generated when it comes into contact with the turbulent flow, and the turbulent flow stagnates in the concave groove to concentrate and form a layer of air film that can isolate the blade surface and the boundary layer. The separation point of the layers can be extended, avoiding the generation of turbulent flow near the blade, reducing the noise and frictional resistance of the blade generated by the turbulent flow, smoothing the rotation of the blade It is possible to save power and power, and to improve the heat sink efficiency of the fan.

1 is an explanatory diagram of a three-dimensional fan assembly according to a first embodiment of the present invention. It is a three-dimensional external view explanatory drawing of the wheel of this invention, and a wing piece. It is combination sectional drawing of the wheel of this invention, and a blade piece. It is airflow explanatory drawing at the time of fan use of this invention. It is state explanatory drawing between the blade piece and airflow of this invention. It is 2nd Example of the wing piece of this invention.

  The detailed description and technical contents of the embodiments of the present invention will be described below with reference to the drawings. However, the drawings are provided for reference and explanation only, and are intended to limit the present invention. It is not used for.

  1 to 3 are a combined three-dimensional appearance explanatory view of a fan according to a first embodiment of the present invention, a three-dimensional appearance explanatory view of a wheel and a blade piece, and a three-dimensional appearance explanatory view of another angle. The fan 1 of the present embodiment includes a base 10, a wheel 20, and a plurality of blade pieces 30 protruding from the outer edge of the wheel 20.

  The base 10 is a rectangular housing and has a housing space 100, the wheel 20 and the plurality of blade pieces 30 are coupled into the housing space 100, and the base 10 has an intake side 11. And an exhaust side 12 opposite to the intake side 11, and the outer edges of the intake side 11 and the exhaust side 12 form a neck portion 13 having the accommodating space 100 in the concave direction. In the present embodiment, the neck 13 is provided at the center of the four sides of the base 10.

  The wheel 20 and a plurality of blades 30 projecting to the outer edge of the wheel 20 are coupled into the housing space 100 and have a rotating shaft 21 and a motor (not shown) inside the wheel 20. After operation, the rotation of the rotating shaft 21 of the wheel 20 can be interlocked, and the blades 30 installed on the outer edge of the wheel 20 also rotate to generate an air current.

  The blade piece 30 includes a first surface 31 and a second surface 32 opposite to the first surface 31, and each blade piece 30 has a plurality of polygonal (concave) recesses (grooves) 33. The polygonal recess (groove) 33 is laid and can exhibit any shape in a polygon such as a triangle, a quadrilateral ... an octagon, that is, the recess of the polygon The two adjacent sides of the (groove) 33 exhibit a sandwich angle. In the present embodiment, the first surface 31 and the second surface 32 of the blade piece 30 are both provided with the polygonal recesses (grooves) 33, and in the actual implementation, the polygonal recesses (grooves) are provided. ) 33 may be provided only on one (one side) surface. Of course, it may be provided on both sides.

  FIGS. 4 and 5 are an explanatory view of the airflow when the fan of the first embodiment of the present invention is used and an explanatory view of the state between the blade piece and the airflow, respectively. The installation of the neck 13 is advantageous for the outside air to enter the intake side 11, and when the airflow is discharged from the exhaust side 12, the installation of the neck 13 reduces the resistance during exhaust. It is advantageous to do.

  The airflow A generated during operation of the fan 1 forms a boundary layer B on the surface of the blade piece 30. On the other hand, when the airflow A flows through the side of the polygonal recess (groove) 33, A generates a turbulent flow T stagnating in the polygonal concave portion (groove) 33, and a plurality of turbulent flows T are concentrated to form a single air film, which is the surface of the blade piece 30. And the formation of the gas film extends the separation point S of the boundary layer B, the separation point S is formed outside the blade piece 30, and turbulence occurs in the vicinity of the blade piece 30. The generation of the flow T and the generation of noise in the blade piece 30 are avoided, and the frictional resistance force that increases the turbulent flow T is reduced.

  In the above structure, the portion where the turbulent flow T is likely to occur is generated along the side of the polygonal recess (groove) 33, and when the velocity of the airflow A is high, the turbulent flow T is easily generated. Therefore, when the velocity of the airflow A is high, the polygonal concave groove 33 can be provided in a plurality of relatively few triangles or quadrilaterals, while the velocity of the airflow A is slow, The polygonal recess (groove) 33 is preferably provided in a relatively large hexagon or heptagon.

  FIG. 6 shows a second embodiment of the blade of the fan of the present invention. This embodiment is substantially the same as the first embodiment, and the different points are the polygonal recesses (grooves) of the blade 30a. ) 33a is formed of any two or more polygonal concave portions (grooves) in the shape of a triangle, a quadrilateral, an octagon, etc. It is possible to smoothly generate a turbulent flow and a gas film in the concave portion (groove) 33a.

As described above, according to each embodiment of the present invention, the airflow generated when the fan rotates forms a boundary layer on the blade piece surface, and a plurality of polygonal recesses (grooves) are provided on each blade piece. When the airflow flows through each recess (groove), a turbulent flow stagnating in the recess (groove) is generated, and a plurality of turbulent flows are collected to form a single air film between the blade surface and the boundary layer. By forming the boundary layer, the separation point of the boundary layer is extended, the frictional resistance and the noise of the blade piece are reduced, and as a result, the rotation of the blade piece becomes smoother, power saving, and power saving, and the heat sink efficiency of the fan is improved.
In the present invention, preferred embodiments have been disclosed as described above, but these are not intended to limit the present invention in any way, and anyone who is familiar with the technology has an equivalent scope that does not depart from the spirit and scope of the present invention. Of course, various fluctuations and moist colors can be added.

DESCRIPTION OF SYMBOLS 1 Fan 10 Base 100 Accommodating space 11 Intake side 12 Exhaust side 13 Neck part 20 Wheel 21 Rotating shaft 30 Wing piece 31 First surface 32 Second surface 33 Polygonal (polygonal) recess (groove)
A Airflow B Boundary layer T Turbulence S Separation point 30a Wing piece 33a Polygonal (polygonal) recess (groove)

Claims (7)

  A plurality of blades extending from an outer edge of the wheel, and the airflow generated when the fan rotates forms a boundary layer on the surface of the blades, and a plurality of polygonal recesses on each blade When the airflow flows through each of the recesses, a turbulent flow stagnating in the recesses is generated, a plurality of turbulent flows are collected, and a single air film interposed between the blade surface and the boundary layer A fan structure characterized by forming.   The fan structure further includes a base, the base being a rectangular housing and having a receiving space, and the wheel and the plurality of blade pieces are coupled to the receiving space. The fan structure described in 1.   The fan structure according to claim 2, wherein a neck portion having the concave accommodating space is formed on an outer edge of the base.   The fan structure according to claim 1, wherein two adjacent sides of the concave portion exhibit a sandwich angle.   The fan structure according to claim 1, wherein the recess has any shape from a triangle to an octagon.   2. The fan structure according to claim 1, wherein the polygonal concave portion of the blade piece includes two or more types of polygonal concave grooves from a plurality of triangles to an octagon.   2. The fan structure according to claim 1, wherein the blade piece includes a first surface and a second surface opposite to the first surface, and the polygonal recess is provided in the first surface and the second surface. .

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