TWI820443B - Fan frame structure - Google Patents

Abstract

A fan frame structure includes a base portion and a wall portion. The base portion has at least one extension section vertically extended from an outer peripheral edge of the base portion, and the extension section has connecting sides. The wall portion is formed along the outer peripheral edge of the base portion through an insert molding process. The wall portion includes a plurality of wall segments connected to the connecting sides of the extension sections, and a clearance is formed between any two adjacent wall segments. With these arrangements, the base portion can better resist a wrapping force from the insert-molded wall portion to avoid deformation.

Description

Fan frame structure

A fan outer frame structure, in particular, refers to a fan outer frame structure that increases the ability to resist the wrapping force of injection molding, thereby reducing base deformation.

The centrifugal fan is a commonly used system fan. It is often used in electronic equipment with a narrow space or in situations where the air outlet is located on the side. The centrifugal fan base is usually made of a single material of plastic or thin metal parts. When plastic parts are used Sometimes it is manufactured by plastic injection molding, but the strength of the plastic base is not good, so thin metal parts are used as the base material, and then through the integral injection processing method, a side wall is vertically injected around the edge of the metal base to form a centrifugal Fan frame.

As mentioned above, it is widely used in centrifugal fan outer frames, which generally include two parts: a metal base and a plastic side wall. The metal base is usually molded into a centrifugal fan outer frame through plastic injection molding. However, since plastic injection molding easily produces wrapping forces, the thin metal base is prone to extrusion and deformation under the wrapping force. As a result, after the finished fan is assembled, the design gap size, level and balance between the blades and the base are affected, which in turn affects the fan. performance (blade interference base/PQ change/sound change), therefore a structural design that can resist the injection molding deformation of the centrifugal fan frame is required.

Therefore, how to improve the deformation of the metal base caused by conventional injection molding of centrifugal fan side walls is the top priority for those familiar with this technology.

Therefore, in order to effectively solve the above problems, the main purpose of the present invention is to provide a fan outer frame structure that can improve the deformation of the metal base caused by the conventional injection molded centrifugal fan side wall.

In order to achieve the above purpose, the present invention provides a fan outer frame structure, which includes: a base plate and a wall portion; at least one extension portion extends from the outer edge of the base plate, and the extension portion has a connecting side; the wall portion integrally covers A plurality of wall parts are formed at the edge of the base plate, and these wall parts are respectively connected to the connecting sides of the extension part to increase the ability to resist the wrapping force of the over-injection molding, thereby reducing the deformation of the base plate.

Through the fan outer frame structure of the present invention, the extension portion is connected to the wall components and at least one gap is reserved between the wall components, so that the gap provides the wall components of the wall with a margin of expansion and contraction, thereby preventing After the wall is injection molded, the material expands and squeezes the base plate, forcing the base plate to deform.

1: Bottom plate

11:Extension part

11a:Left side

11b: right side

111:Perforation

112:Through hole

12: Space

13:Air outlet

14: Tongue

2: Wall

2a:Wall pieces

21: Gap

3: Shaft barrel

Figure 1 is an exploded perspective view of an embodiment of the fan outer frame structure of the present invention; Figure 2 is an assembled perspective view of an embodiment of the fan outer frame structure of the present invention; Figure 3 is an embodiment of the fan outer frame structure of the present invention. Three-dimensional diagram.

The above objects and structural and functional characteristics of the present invention will be explained based on the preferred embodiments of the accompanying drawings.

Please refer to Figures 1 and 2, which are three-dimensional exploded and assembled views of an embodiment of the fan frame structure of the present invention. As shown in the figures, the fan frame structure of the present invention includes: a base plate 1 and a wall portion 2;

The base plate 1 is a thin plate (piece) made of metal, and extends along at least one extension portion 11 along the outer edge of the base plate 1 . The extension portion 11 has a connection side, and the connection side is located on the left side of the extension portion 11 11a and the right side 11b, the extension portions 11 are formed by stamping or bending, and the extension portions 11 have at least two through holes (framework) 111.

The wall part 2 is formed on the outer edge of the base plate 1 through integral injection molding. The wall part 2 has a plurality of wall parts 2a, and the wall parts 2a are respectively connected to the left side 11a and the connecting side of the extension part 11. The right side 11b forms a gap 21 between the wall parts 2a. The wall part 2 is simultaneously filled with the through holes 111 of the extension part 11 through integral injection molding, and when the wall part 2 is cooled and solidified The through hole 111 is then used to further increase the degree of integration and stability with the extension 11 and the base plate 1 .

In the aforementioned embodiment, there is a shaft barrel 3 at the center of the base plate 1. The shaft barrel 3 is formed in the center of the base plate 1 through integral injection molding. The base plate 1 is provided with a plurality of through holes 112 around the shaft barrel 3. The wall 2 surrounds the outer periphery of the bottom plate 1 and defines a space 12 and an air outlet 13 together with the bottom plate 1 . The wall 2 has a tongue 14 close to the air outlet 13 .

The extension portions 11 can extend along the edge of the bottom plate 1 . The extension portions 11 can be formed by stamping or bending. The extension portions 11 can be spaced apart as shown in Figure 1 , or can be continuous and circular along the edge of the bottom plate 1 . The extension is as shown in Figure 3, and the structural strength of the base plate 1 is strengthened to prevent deformation of the base plate 1 by covering and combining the extension part 11 with the wall part 2.

The present invention mainly provides a fan outer frame structure. Through integral injection molding (injection molding), the fan outer frame structure leaves at least a gap 21 (or groove) between the wall parts 2, which means that the wall parts 2a are aligned with each other. The discontinuous connection state allows the gap 21 to provide the wall 2 with a margin for expansion and contraction, thereby preventing the material expansion of the wall 2 after injection molding from squeezing the base plate 1 and forcing the base plate 1 to deform.

1: Bottom plate

11:Extension part

11a:Left side

11b: right side

14: Tongue

2: Wall

2a:Wall pieces

21: Gap

3: Shaft barrel

Claims (6)

A fan outer frame structure includes: a bottom plate, at least one extension part extends from the outer edge of the bottom plate, and the extension part has a connecting side located on one left side and one right side of the extension part; a wall part, which is integrated Projected at the edge of the bottom plate, the wall portion has a plurality of wall pieces, and the wall pieces are respectively connected to the extension portion, and there is a gap between the wall pieces so that the wall pieces are discontinuously connected to each other. The gaps The wall is provided with a margin of expansion and contraction to prevent the material expansion of the wall after injection molding from squeezing the base plate and forcing the base plate to deform. For the fan outer frame structure described in item 1 of the patent application, the extension portion is divided into a plurality of equal parts and arranged at intervals from each other. In the fan frame structure described in item 1 of the patent application, the extension part is formed by stamping or bending. In the fan outer frame structure described in claim 1 of the patent application, the extension portion has at least one through hole, and the wall portion is provided with such holes to be combined with the extension portion. As for the fan outer frame structure described in item 1 of the patent application, the bottom plate is made of metal. As in the fan frame structure described in item 1 of the patent application, the extension portions are formed by extending from the edge of the bottom plate at intervals.

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