TWI774458B - Centrifugal fan frame structure - Google Patents

Abstract

A centrifugal fan frame structure includes a base plate and a plurality of side wall sections. The side wall sections are discontinuously formed along an outer periphery of the base plate through injection molding, such that a clearance is formed between any two adjacent side wall sections, and portions of the outer periphery of the base plate located corresponding to the clearances are not covered by any injection molded side wall section. And, the side wall sections and the base plate together define a receiving space between them. With the injection molded side wall sections being spaced along the outer periphery of the base plate, a wrapping force from the injection molded side wall sections is effectively reduced to prevent the base plate from structural deformation under the wrapping force.

Description

Centrifugal fan frame structure

The present invention relates to a centrifugal fan frame structure, in particular to a centrifugal fan frame structure which can reduce the force of injection molding and reduce the deformation of the bottom plate.

Centrifugal fans are commonly used system fans. They are often used in electronic equipment with limited space, or where the air outlet is located on the side. The base of the centrifugal fan is usually made of a single material of plastic or thin metal parts. When using plastic parts At times, it is manufactured by plastic injection molding, but the strength of the plastic base is not good, so a thin metal plate is selected as the base material.

The conventional centrifugal fan frame is mainly composed of two parts: a thin metal base and a plastic side wall. Usually, the plastic side wall is wrapped around the outer periphery of the metal base by integral injection molding, and the injection-molded plastic The side walls are arranged in a continuous shape to form the outer frame of the centrifugal fan in combination with the metal base. However, another problem arises, that is, because the wrapping force is easily generated during the injection of the plastic wrap, when the outer periphery of the metal base is integrally wrapped by the plastic side wall, the metal base will be squeezed under the action of the wrapping force. The deformation will cause the metal base to deform and be uneven, so as to affect the design gap size, level and balance between the blades and the base in the assembled centrifugal fan, and further affect the overall performance of the centrifugal fan (such as blade interference with the base/PQ changes). / sound changes), so a structural design that can resist the injection molding deformation of the outer frame of the centrifugal fan is required.

Therefore, how to improve the lack of deformation of the metal base caused by the conventional injection-molded centrifugal fan sidewall is the first and foremost goal of those who are familiar with the art.

One object of the present invention is to provide a centrifugal fan frame structure that reduces the inner force of injection molding (injection molding) and reduces the deformation effect of the bottom plate.

Another object of the present invention is to provide a fan frame structure formed by injection molding through a plurality of side walls at multiple intervals and combined with the outer edge of a bottom plate, so as to achieve (resist) prevent the structural deformation of the fan frame structure during injection molding. Fan frame structure.

In order to achieve the above object, the present invention provides a centrifugal fan frame structure, comprising a bottom plate and a plurality of side wall portions, the plurality of side wall portions are injection-molded at the outer periphery of the bottom plate, and the plurality of side wall portions are discontinuous, And let the plurality of side wall parts have a gap between each other, the outer periphery of the bottom plate in the gap is not covered, and the plurality of side wall parts and the bottom plate jointly define an accommodating space, through the fan frame structure of the present invention The design can effectively reduce the inner force of the injection molding and the effect of reducing the deformation of the bottom plate, and effectively prevent the structural deformation of the fan frame structure during the injection molding.

The plurality of side wall portions have a plurality of long linear side wall portions and a plurality of arc side wall portions, the plurality of arc side wall portions and the plurality of long linear side wall portions together form a ring wall, and the plurality of arc side wall portions are not connected to each other.

The bottom plate and the plurality of side walls are made of the same material or different materials. The above-mentioned side wall parts are made of plastic material, and the bottom plate is made of metal material.

1: Sash frame structure

11: Bottom plate

110: long linear edge

111: Straight edge

112: Arc Edges

113: air inlet

114: Axle barrel

12: side wall

121: Long linear side wall

122: Arc side wall part

13: Gap

14: Accommodating space

15: Air outlet

2: Centrifugal fan

21: Upper board

22: Fan wheel

23: Blades

FIG. 1 is a three-dimensional partial cross-sectional schematic diagram of an embodiment of the present invention.

FIG. 2 is a schematic top view of FIG. 1 of the present invention.

FIG. 3 is an exploded perspective view of a centrifugal fan according to an embodiment of the present invention.

The above-mentioned objects of the present invention and their structural and functional characteristics will be described with reference to the preferred embodiments of the accompanying drawings.

The present invention provides a centrifugal fan frame structure 1, please refer to Figures 1 and 2, supplemented by Figure 3, the centrifugal fan frame structure 1 includes a bottom plate 11 and a plurality of side wall portions 12, and the bottom plate 11 is made of metal Material (such as stainless steel, aluminum, iron, titanium or alloy material), the bottom plate 11 has a straight edge 111, a long edge 110, a shaft 114, an air inlet 113 and an arc edge 112, the arc edge 112 It is formed by extending from one end of the long linear edge 110 along the outer contour of the bottom plate 11 to the other end of the long linear edge 110. The long linear edge 110 and the linear edge 111 are vertically arranged and connected. The shaft barrel 114 It is arranged at the center of the bottom plate 11 (or deviated from the center) for pivoting a fan wheel 22 with a plurality of blades 23 of the centrifugal fan 2 , and the air inlet 113 is opened around the shaft barrel 114 , which is used to guide an external airflow to enter.

The plurality of side wall portions 12 are made of plastic material or metal material. The plurality of side wall portions 12 have a plurality of long linear side wall portions 121 and a plurality of arcuate side wall portions 122 , and the plurality of arc side wall portions 122 and the plurality of long linear side wall portions 121 together form a ring In this embodiment, the plurality of long-line sidewall portions 121 and the plurality of arc-shaped sidewall portions 122 are selected as plastic materials and are integrally injection-molded to cover the long-line-shaped edge 110 and the arc-shaped edge 112 of the bottom plate 11, in other words, the The plurality of side wall portions 12 are integrated with the long-line edge 110 and the arc-shaped edge 112 of the bottom plate 11 in a multi-segment (ie, discontinuous) manner by integral injection molding (ie, one-piece plastic injection molding) to form the fan frame structure 1 . The plurality of arc-shaped side wall portions 122 are spaced apart from each other by a gap 13, and the arc-shaped edge 112 of the bottom plate 11 in each gap 13 is not covered by the aforementioned arc-shaped side wall portions 122, and two adjacent arc-shaped There is also no connection between the side wall portions 122 . Therefore, through the gaps 13 between the plurality of arc-shaped side wall portions 122, the plurality of injection-molded side wall portions 12 are provided with a margin for expansion and contraction, thereby preventing the side wall portions 12 from being injection-molded. The material expansion squeezes the bottom plate 11 , and also effectively reduces the wrapping force generated by the plastic injection and the effect of reducing the deformation of the bottom plate 11 .

In addition, the plurality of side wall portions 12 and the bottom plate 11 together define an accommodating space 14 and an air outlet 15 , the accommodating space 14 is connected to the air inlet 113 and the air outlet 15 , the shaft barrel 114 and the fan wheel thereon 22 is accommodated in the accommodating space 14, wherein the bottom plate 11 and the plurality of side wall portions 12 can be made of the same material or different materials.

In addition, in the actual implementation of the present invention, the top side of the plurality of side walls 12 of the fan frame structure 1 of the present invention is assembled with an upper plate 21 of the centrifugal fan 2, so the fan of the present invention is used through the centrifugal fan 2 The frame structure 1 can keep an axial distance between the plurality of blades 23 on the fan wheel 22 in the centrifugal fan 2 and the bottom plate 11 constant, thereby effectively stabilizing the performance of the centrifugal fan 2 .

Therefore, the design of the fan frame structure 1 is formed by the plurality of side wall portions 12 being injection-molded and combined with the outer periphery of the bottom plate 11 at multiple intervals of the present invention, so as to effectively reduce the wrapping force of the side wall portions 12 by injection molding and reduce the deformation of the base structure. effect, thereby effectively preventing the structural deformation of the fan frame structure 1 during injection molding.

1: Sash frame structure

11: Bottom plate

110: long linear edge

111: Straight edge

112: Arc Edges

113: air inlet

114: Axle barrel

12: side wall

121: Long linear side wall

122: Arc side wall part

13: Gap

14: Accommodating space

15: Air outlet

Claims (4)

A centrifugal fan frame structure includes a bottom plate made of metal material and a plurality of side wall portions, the outer periphery of the bottom plate is integrally plastic injection molded with the plurality of side wall portions, and the plurality of side wall portions have a telescopic gap between each other, so that the It is discontinuous, and the outer periphery of the bottom plate in the expansion gap is not covered, and the plurality of side walls and the bottom plate jointly define a accommodating space, and the expansion gap reduces the wrapping force generated by the plastic injection and reduce the deformation of the base plate. The centrifugal fan frame structure according to claim 1, wherein the plurality of side wall portions have a plurality of long linear side wall portions and a plurality of arcuate side wall portions, and the plurality of long linear side wall portions and the plurality of arc side wall portions are formed together A ring wall, and the plurality of arc-shaped side walls are not connected with each other. The centrifugal fan frame structure as described in claim 1, wherein the bottom plate and the plurality of side walls are made of the same material or different materials. The centrifugal fan frame structure described in claim 1, wherein the plurality of side walls are made of plastic material, and the bottom plate is made of metal material.

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