Centrifugal fan for oil and smoke exhaust machine and method for manufacturing volute profile line thereof

A technology for centrifugal fans and range hoods, which is applied in the directions of machines/engines, mechanical equipment, liquid fuel engines, etc., can solve the reduction of fan air volume, air pressure and efficiency, deterioration of airflow unevenness at the impeller outlet, and uneven airflow at the impeller outlet. and other problems, to achieve the effect of reduced efficiency, simple and reasonable volute structure, and ingenious design
CN102182707BInactive Publication Date: 2013-10-09FOSHAN SHUNDE MIDEA WASHING APPLIANCES MFG CO LTD
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Patents(China)
Current Assignee / Owner
FOSHAN SHUNDE MIDEA WASHING APPLIANCES MFG CO LTD
Publication Date
2013-10-09
Estimated Expiration
Not applicable Β· inactive patent

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Abstract

The invention relates to a centrfugal fan for an oil and smoke exhaust machine and a method for manufacturing a volute profile line thereof. The centrfugal fan comprises a volute, a blade wheel, an air inlet ring and a motor, wherein the volute is provided with an air inlet and an air outlet; the blade wheel is arranged in the volute; the air inlet ring is arranged on the air inlet; the motor drives the blade wheel to rotate; the volute comprises a volute top plate, a volute enclosing plate and a volute base plate; and the volute enclosing plate is connected between the volute top plate and the volute base plate. The centrfugal fan is characterized in that the outline of the inner side face of the volute enclosing plate is the volute profile line, and the volute profile line is formed by the smooth transitional connection of a first straight line DE, a first arc line EF, a second arc line FG, a spiral line GH and a second straight line HI. According to the invention, after considering problems in the prior art and aiming at the characteristics of large impellor size and small volute size of the centrifugal fan for the oil and smoke exhaust machine, a design method of the volute profile line of the centrifugal fan is presented, thereby making great contribution to improving the air rate, air pressure and efficiency of the centrifugal fan for the oil and smoke exhaust machine and reducing the pneumatic noises.
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Description

technical field

[0001] The invention relates to a centrifugal fan used for a range hood and a method for generating a volute profile thereof. Background technique

[0002] Existing centrifugal fans have been widely used in range hoods due to their advantages of large suction, low noise, and compact structure. The volute is one of the core components of the centrifugal fan. Its function is to concentrate the gas leaving the impeller, guide it to the outlet of the volute, and convert part of the dynamic pressure of the gas into static pressure. The volute shape of the centrifugal fan determines the shape of the volute, which has a great influence on the air volume, wind pressure, efficiency and aerodynamic noise of the centrifugal fan. The production method of conventional centrifugal fan volute is as follows: Figure 5 As shown, the volute profile is formed by the first straight line D 1 E. 1 , Arc E 1 f 1 , logarithmic spiral F 1 G 1 and the second straight line G 1 ...

Claims

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