CN201330737Y - Nine-rectangle shaped blades cooling fan fin - Google Patents

Abstract

The utility model relates to a nine-rectangle shaped blades cooling fan fin, comprising a rotating shaft base (1) and nine blades (2), the blades (2) rotate around central point of the rotating shaft base (1), a circular array is installed on the rotating shaft base (1), the blades (2) are rectangle shaped, blade inlet angle is equal to 87 DEG, blade outlet angle is equal to 93 DEG, setting angle of blade is equal to 18 DEG, air-intake edge angle is equal to 0 DEG, air-outtake edge angle is equal to 180 DEG, and scale division angle alpha is equal to 16 DEG. According to the utility model, the blade shape is designed to not interfere airflow along streamline, to eliminate generation of viewable eddy zone in turbulent current, and to minimize flow energy loss, thereby improving efficiency factor of the fan, simultaneously noise caused by high band airflow is reduced because of reduction of the whirling current.

Description

Nine rectangular blade cooling fan sheets

Technical field

The utility model relates to a kind of multi blade fan sheet, relates in particular to a kind of nine blade fan sheets.

Background technique

The multi blade fan sheet generally comprises shaft seat 1 as shown in Figure 1, and 1 week of shaft seat, blade 2 was made the shape of relative sense of rotation R towards front curve around arranging blade 2.Air is flowed through blade 2 again to trailing edge B along the profile of blade by leading edge leading edge A; When the shaped design of blade unreasonable, the air-flow in the blade C district is pressed blade profile and declivity dearly, although air-flow has inertia, and, the air-flow of blade D outside is spaced, and forms discontinuous mobile.This discontinuous flow causes that speed falls, and lowers efficiency because of the formation of resistance.

Summary of the invention

The purpose of this invention is to provide a kind of nine rectangular blade cooling fan sheets, agitate big, the inefficient defective of the loss of energy to solve the prior art apoplexy.

Technological scheme

The utility model provides a kind of nine rectangular blade cooling fan sheets, comprise shaft seat (1) and blade (2), described blade (2) has 9, around the central point of shaft seat (1), annular array is installed on the shaft seat (1), described blade (2) is a rectangular, 87 ° of inlet blade angles, 93 ° of blade outlet angles, 18 ° of blade angles, 0 ° of air inlet corner, 180 ° of the corners of giving vent to anger, division angle alpha=16 °.

Beneficial effect

Blade shape design of the present utility model can not interfered longshore current line airflow flowing, got rid of the generation of observable vortex in the turbulent flow, and make the energy of flow loss reduce to minimum, thereby improved the efficient of fan, the minimizing of eddy current has simultaneously also reduced the generation of the noise that causes because of the high frequency band air-flow.

Description of drawings

Fig. 1 is a multi blade fan structural representation of the prior art;

Fig. 2 is a structural representation of the present utility model.

Embodiment

Below in conjunction with specific embodiment, further set forth the utility model.Should be understood that these embodiments only to be used to the utility model is described and be not used in the restriction scope of the present utility model.Should be understood that in addition those skilled in the art can make various changes or modifications the present invention after the content of having read the utility model instruction, these equivalent form of values fall within the application's appended claims institute restricted portion equally.

Embodiment 1

As shown in Figure 2, the utility model provides a kind of nine rectangular blade cooling fan sheets, comprises shaft seat 1 and blade 2, described blade 2 has 9, around the central point of shaft seat 1, annular array is installed on the shaft seat 1, and described blade 2 is a rectangular, 87 ° of inlet blade angles, 93 ° of blade outlet angles, 18 ° of blade angles, 0 ° of air inlet corner, give vent to anger 180 ° of corners, division angle alpha=16 °.

Above-mentioned division angle alpha is the outer end of leading edge A and the line of shaft seat 1 central point, with the inner of trailing edge B and the formed angle of line of shaft seat 1 central point.

Claims (1)

1. rectangular blade cooling fan sheet, comprise shaft seat (1) and blade (2), described blade (2) has 9, around the central point of shaft seat (1), annular array is installed on the shaft seat (1), it is characterized in that: described blade (2) is rectangular, 87 ° of inlet blade angles, 93 ° of blade outlet angles, 18 ° of blade angles, 0 ° of air inlet corner, 180 ° of the corners of giving vent to anger, division angle alpha=16 °.

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