Axial-flow windwheel

An axial-flow wind and hub technology, which is applied to the components of pumping devices for elastic fluids, non-variable-capacity pumps, machines/engines, etc. It takes away the heat of the outdoor unit and does not consider reducing the separation of the boundary layer, so as to achieve the effects of low rotor weight and rotor production cost, reduced wake strength, low noise and motor load

CN101012839AInactive Publication Date: 2007-08-08GD MIDEA AIR-CONDITIONING EQUIP CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2007-08-08
Estimated Expiration
Not applicable · inactive patent

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Abstract

An axial-flow wind wheel comprises three blades set on a hub, wherein, the end area of the blades is dishing toward to the costal air-in direction; the three blades use the rotary central axis of the wind wheel as center each other and they allocate equal-spaced or unequal-spaced in the 120degree+-15degree. The external diameter of the axial-flow is defined as D2, the hub diameter is defined as D1, the height of the blade Rm is defined as (D2-D1) / 2, the circumference diameter in which there is the beginning dishing place A is defined as D3, (D3-D1) / 2=(0.10-0.47)Rm. Since the high-middle part of the trailing edge change the distribution of pressure of the blades before the blade root part, the high pressure draught compartment of the blades flow direction low pressure surface advanced to make local pressure ascending, to reduce boundary layer separating, to make the boundary layer turn into turbulent flow before getting the front of the blade end, to reduce convolution noise and rotor wake, thereby having low noise and big air quantity.
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Description

Technical field

[0001] The invention relates to an axial flow wind wheel, in particular to a three-blade axial flow wind wheel suitable for an outdoor unit of an air conditioner. Background technique

[0002] Axial fans are mostly used in outdoor units of air conditioners. In the conventional axial flow fan, the rear edge in contact with the downstream side of the outlet airflow (hereinafter, the rear edge of the blade in contact with the downstream side of the airflow is referred to as the "blade trailing edge") is convex or flat in the downstream direction of the airflow outlet. Form 2 to 4 leaves together.

[0003] A single blade in a conventional axial flow wind wheel with two blades has a heavy load, each blade works under high load, the flow and static pressure are relatively low, the wind noise is high, and the motor is required to have a higher speed. The requirements for the strength and motor load characteristics of the 2-blade axial flow wind wheel are relatively high....

Examples

Embodiment Construction

[0025] The present invention will be further described below with reference to the drawings and embodiments.

[0026] In the figure, 1 is the axial flow wheel, 2 is the hub, 3 is the blade, 3a is the downstream edge of the airflow, 3b is the recessed part, D1 is the diameter of the hub, D2 is the outer diameter of the axial flow wheel, and D3 is the blade The diameter of the circumference of the starting position A of the trailing edge of the blade, D4 ​​is the diameter of the circumference of the position B where the trailing edge of the blade ends, Rm is the height of the blade, H1 is the maximum height of the recessed part from the lowest position C of the trailing edge of the blade 3, H2 Is the height of the wind turbine blade calculated from the lowest position C of the trailing edge of the blade 3, δ is the depth of the depression, L is the length of the chord line of the blade, f is the tip trailing edge point, k is the connection line, 11 is the outdoor air-conditioning un...