CN2560780Y - Improvement of Centrifugal Fan Structure - Google Patents

Abstract

The utility model is a structural improvement of a centrifugal fan, which is mainly provided with an upper cover, annular blades and a base, wherein the upper cover is provided with an air inlet at the center and an air outlet at one side; a shaft is provided at the center of the base for assembling a transmission main shaft of a small motor; the base is provided with an air outlet relative to the upper cover, so that the upper cover and the base are matched to form a closed shell; the annular blade is provided with a circular frame, and a plurality of long plate blades are provided on the circumference thereof, and a central ridge is provided at the center; an extension is provided at the bottom of the blade on the annular blade in the direction of the transmission main shaft, so that the power of the transmission main shaft of the fan can be reduced during operation.

Description

Improvement of Centrifugal Fan Structure

technical field

The utility model relates to electromechanical products, in particular to a structural improvement of a centrifugal fan, especially a product with reduced motor power and increased rotational speed. Torque, thereby prolonging the life of the fan.

Background technique

At present, the heat dissipation method in the computer, especially the fan directly blowing the parts to dissipate heat is the most commonly used, and the centrifugal fan means that the airflow enters from the front air suction port of the fan, and then circulates through the surrounding deflectors, and the airflow is diverted from the side The fan structure blown out of the air outlet is a fan structure that can save space; the common centrifugal fan structure, as shown in accompanying drawing 8 and accompanying drawing 9, is provided with an air inlet 51 in the center by an upper cover 50, An air outlet 52 is set on one side; a shaft portion 61 is set at the center of the base 60, which is used to fix the drive shaft 40 of a small motor and to drive the annular fan blade B to rotate; the base 60 is also set relative to the upper cover 50 The air outlet 62, and after the upper cover 50 and the base 60 are combined, a closed fan casing is formed, which can drive the annular fan blade B to rotate, so that the air flow enters from the air inlet 51 of the upper cover 50 and passes through the annular fan. The airflow is blown out from the air outlets 52 and 62 when the blade B is moved; the ring-shaped fan blade B is mainly provided with a circular frame B10, and a plurality of upright long plate-shaped blades B20 are densely arranged on its periphery. ; When the drive shaft 40 rotates, the annular fan blade B pushes the air with the long plate-shaped blade B20 on the outermost edge, and will be subjected to a resistance P, so the drive shaft 40 must have a certain torque W to drive the fan ; As shown in accompanying drawing 9, above-mentioned air resistance P is almost all borne by the long plate blade B20 of the outermost edge of the annular fan blade B, so what the transmission spindle 40 is subjected to is the maximum moment, that is, the annular The radius of the fan blade B is multiplied by the resistance P, so that the torque W of the motor cannot be effectively reduced, that is, it consumes a large amount of power. This is what the manufacturer has been trying to improve. How to reduce the power of the fan motor is a must at present. The purpose of rapid improvement.

Utility model content

According to the purpose of this utility model, a specially designed annular fan blade is provided. When it reaches a certain rotation speed, it can save more power and prolong its service life. And the base, wherein, the upper cover is provided with an air inlet in the center, and an air outlet is provided on one side; a shaft is provided in the center of the base, which is used to assemble the drive shaft of a small motor and to drive the ring-shaped fan blade to rotate; The base is provided with an air outlet relative to the upper cover, so that the upper cover and the base are combined to form a closed shell; the annular fan blade is provided with a circular frame, and a plurality of long plate blades are densely arranged on its periphery, and A central ridge is set at the center, and the central ridge can be covered on the transmission main shaft on the base; its characteristic is that the bottom of the blade on the annular fan blade is provided with an extension in the direction of the transmission main shaft, which can be used during operation. The power of the drive shaft of the fan can be reduced.

Description of drawings

Fig. 1 is a three-dimensional exploded schematic view of the utility model.

Fig. 2 is a schematic cross-sectional view of the annular fan blade of the present invention.

Fig. 3 is a schematic diagram of an embodiment of the first extension part of the blade of the present invention.

Fig. 4 is a schematic diagram of an embodiment of the second extension part of the blade of the present invention.

Fig. 5 is a schematic diagram of an embodiment of the third extension part of the blade of the present invention.

Fig. 6 is another assembly diagram of the blade with extension part of the present invention.

Fig. 7 is a schematic diagram of the action and force of the utility model.

FIG. 8 is a three-dimensional exploded schematic diagram of a common fan.

Figure 9 is a schematic diagram of the action and force of a common fan.

Detailed ways

As shown in accompanying drawings 1 and 2, the utility model includes an upper cover 10, an annular fan blade A and a base 20, wherein the upper cover 10 is provided with an air inlet 11 in the center, and an air outlet 12 is provided on one side; There is a shaft portion 21 in the center of the base 20, which is used to assemble the drive shaft 30 of a small motor and to drive the annular fan A to rotate; the base 20 is also provided with an air outlet 22 relative to the upper cover 10, so that the upper cover 10 After being combined with the base 20, a closed fan casing is formed. When the annular fan blade A is rotated, the airflow can enter from the air inlet 11 of the upper cover 10, and the airflow can be guided to the air outlets 12 and 22. Blow out; the annular fan blade A is mainly provided with a circular frame body A10, and a plurality of upright long plate-shaped blades A20 are densely arranged on its peripheral sides, and a central raised part A30 is arranged at the center position, and the central The uplift A30 can be rotated by the transmission spindle 30 covered on the base 20 .

As shown in Figure 3, the bottom of the blade A20 on the annular fan blade A is provided with an extension part A21 toward the direction of the drive shaft 30, and the outer edge of the extension part A21 is an arc-shaped edge extending downward from the top A22 of the blade A20. A23, and extend inwardly to a suitable position; even can be directly connected with the central ridge A30 by the top A22 as the arc edge A23, as the outermost edge line of the extension A21, that is, the width of the extension A21 is within the width of the blade A20 Any position between the bottom of the vertical line and the central uplift A30 is acceptable.

As shown in FIG. 5 , the upper edge of the extension portion A21 does not have to be connected to the top A22 of the blade A20, and can extend inwardly from any position on the original vertical outer edge of the long plate-shaped blade A20.

As shown in FIG. 4 , the lower edge of the extension part A24 can form a rectangular block and extend inwardly, and at the same time, an appropriate arc chamfer A25 can be formed between the vertical line edge of the blade A20 .

As shown in FIG. 6 , the extension part A21 does not necessarily have to exist on the blades A20 of each annular blade A, and if it is arranged at intervals, it also has the effect of reducing power.

As shown in Figure 7, since the utility model is provided with an extension part A21 on the blade A20 of the annular fan blade A, in addition to stirring the air at the outermost end of the blade A20, the extension part A21 can also assist in stirring the air , that is, the resistance P1 of moving the air can be partially shared by the extension part A21 which is closer to the radius of the transmission main shaft 30. Relatively speaking, the torque W1 of the transmission main shaft 30 can be reduced, and when the fan size is the same, it can consume more power. Efficacy is obviously reduced. In fact, the experimental results show that the power consumption rate of the utility model is 0.22 amperes, while the common power consumption rate is 0.31 amperes, and 0.1 amperes can be saved, which can effectively save electric energy in the long run. Increase the service life of the fan motor, or obtain a higher speed at the same power, that is, a better heat dissipation effect.

Claims (3)

1. An improvement in the structure of a centrifugal fan, including an upper cover, an annular fan blade and a base, wherein the upper cover is provided with an air inlet in the center and an air outlet on one side; the base is provided with a shaft in the center for The drive shaft of a small motor is assembled to drive the ring-shaped fan blade to rotate; the base is provided with an air outlet relative to the upper cover, so that the upper cover and the base are combined to form a closed shell; the ring-shaped fan blade is provided with a circular frame body, and a plurality of long plate blades are densely arranged on its peripheral side, and a central ridge is set at the center, so that the central ridge can be covered on the drive shaft on the base. It is characterized in that the annular fan blade has at least one The bottom of the blade is provided with an extension in the direction of the drive shaft, wherein the outer edge of the extension extends downward from the top of the blade to form an arc-shaped edge, and extends inward to a proper position; the width of the extension is Any position between the bottom of the vertical line of the blade and the central ridge; the upper edge of the extension part can be at any position on the original vertical outer edge of the elongated blade; the lower edge of the extension part can form a rectangular block and extend inward. 2. The structural improvement of a centrifugal fan according to claim 1, wherein an appropriate arc chamfer is formed between the extension part and the vertical edge of the blade. 3. The structural improvement of a centrifugal fan according to claim 1, characterized in that: said blades with extensions can be arranged on the annular fan blades at intervals.

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