Small-size centrifugal fan for extractor hood

Abstract

A small-sized centrifugal fan for range hoods, including a wind drum, a wind wheel and a motor, wherein the wind drum is a semi-closed shell structure, including a wind drum bottom shell and a wind drum surface shell, and the wind drum bottom shell is set There is a motor fixing hole, and the motor is fixed on the fixing hole of the bottom shell of the air drum. The projection of the center of the air inlet and the air inlet on the plane where the bottom shell of the air drum is located coincides with the center of the motor fixing hole. The characteristic is that the bottom shell of the air drum and the center of the air drum The edge contour of the flow channel in the surface shell is connected by a straight line AB, a helical curve BC, a circular arc line CD and a straight line DE with a smooth transition in sequence, and the straight line AB and the helical curve BC are tangent at point B, and the helical curve BC is tangent to the circle The arc CD is tangent to the point CD, and the circular arc CD is tangent to the straight line DE at the point D. Compared with the prior art, the present invention makes the air intake on both sides of the impeller more uniform and the air flow inside the wind drum more uniform by optimizing the flow channel profile in the wind drum and the design of the wind wheel, which can greatly improve the air volume and energy efficiency.

Description

technical field [0001] The invention relates to a small-sized centrifugal fan for range hoods. Background technique [0002] At present, built-in kitchens are more and more favored by consumers, so the requirements for the appearance and volume of kitchen appliances are becoming more and more strict, and kitchen appliances are developing towards miniaturization and thinning. As one of the most important household appliances in the kitchen, the range hood will face major challenges in technical requirements such as miniaturization, high suction, low noise, and high energy efficiency. For example, at present, the measured air volume of European standard range hood products within 180mm in width, 150mm in thickness, and 150mm in height is about 300m³ / h, the sound power level is about 65dB, and the energy efficiency is B-level. The main reason why the air volume and energy efficiency cannot be improved is that the design of the wind drum and the wind wheel is unreasonable. At p...

AI Technical Summary

Problems solved by technology

The main reason why the air volume and energy efficiency cannot be improved is that the design of the wind drum and the wind wheel is unreasonable. At present, the contour line of the inner runner of the wind drum is basically composed of multiple arcs, and the outlet of the wind drum is generally designed to be large, which is not It conforms to the design principle of the centrifugal fan; at present, the fan of this specification generally adopts a double air inlet structure, the motor is installed at the air inlet on one side, and the lengths of the blades on both sides of the wind wheel are equal, which does not conform to the distribution of the air inlet ratio on both sides, resulting in the fan less efficient

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