Efficient meridian acceleration axial flow fan with casing

Abstract

The invention relates to an efficient meridian acceleration axial flow fan with a casing. The efficient meridian acceleration axial flow fan comprises an air barrel, a motor, blades and a wind wheel. The wind wheel is a cone column, The air barrel is a tubular body of a trapezoidal structure, and in the airflow flow direction, the inner diameter of the front of the air barrel is larger than that of the rear of the air barrel, and the outer diameter of the blades is larger than the inner diameter of the rear of the air barrel and smaller than the inner diameter of the front of the air barrel. A collector is fixedly connected to the front end of the air barrel, and a flow guide barrel is connected to the rear end of the air barrel. The flow guide barrel is composed of an outer barrel body, an inner barrel body and guide vanes. The outer diameter of the front section of the inner barrel body is equal to the outer diameter of the rear end face of the wind wheel. A T-shaped support is arranged in the inner barrel body, the inner barrel body is fixedly connected with the motor through the T-shaped support, 13 radial flow guide vanes are evenly distributed between the inner barrel body and the outer barrel body, and the section of each flow guide vane is in a wing type. When airflow passes through a rotating impeller, blade top leakage is reduced, pressure is increased, the efficiency of the fan is improved, in addition, the airflow is rectified though the guide vanes in the flow guide barrel, and the efficiency of the fan is improved.

Description

technical field [0001] The invention relates to a meridian-accelerated axial-flow fan, in particular to a high-efficiency meridian-accelerated axial-flow fan. Background technique [0002] The meridional acceleration axial flow fan is named after the oblique intersection of the meridian surface streamline and the axis of the impeller. It is a form between the centrifugal fan and the axial flow fan. It has the large flow coefficient of the axial flow fan, The advantages of high efficiency and high pressure coefficient of centrifugal fan and wide working range. Such as figure 1 As shown, the existing meridian-accelerated axial flow fan is made up of a blower tube 1, a motor 6, a wind wheel, and a fan blade 2. Several oblique wind blades 2 are fixed on the wind wheel. The outer circle of the wheel is in the shape of a cone. [0003] The defect of this kind of fan is that: the diameter of the outer cylinder at the top of the fan blade is the same as the outer diameter of the ...

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Problems solved by technology

[0003] The defect of this kind of fan is that: the diameter of the outer cylinder at the top of the fan blade is the same as the outer diameter of the outer cylinder top of the outlet part of the fan blade. In order to ensure the normal rotation of the fan blade, there is a certain gap between the fan blade and the outer cylinder. The gap between the air ducts is large, and the leakage loss of the blade top is large

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