Double axial-flow wind wheel system

Abstract

The invention provides a double axial-flow wind wheel system, comprising a first axial-flow wind wheel (1) and a second axial-flow wind wheel (2); wherein the rotate speed of the first axial-flow windwheel (1) is N1 circle/minute, the number of blade is Z1, and rotating basic frequency F1=Z1XN1/60 Hz; and the rotate speed of the second axial-flow wind wheel (w) is N2 circle/minute, the number ofblade is Z2, and rotating basic frequency F2=Z2XN2/60 Hz. The system is characterized in that the rotating basic frequency between the first axial-flow wind wheel (1) and the second axial-flow wind wheel (2) is in the range of 4-20 Hz. When being used in an outer machine of an air conditioning room with top wind out structure, side wind out structure or oblique upper wind out structure, because the rotating basic frequency between the first axial-flow wind wheel (1) and the second axial-flow wind wheel (2) is from 4 to 20 Hz, the system can change the rotating noise voice pressure and the voice powder of the double axial-flow wind wheel, thereby greatly weakening or completely removing the beat vibration formed by overlapping the rotating noise of the two wind wheels, obviously improving the tone quality of the outer machine system of the double axial-flow wind wheel, effectively preventing the metal plate structure from resonating, and reaching the aim of reducing the vibration and improving the reliability of the whole machine.

Description

technical field [0001] The invention relates to a double axial flow wind wheel system, in particular to a parallel double axial flow wind wheel system applied to air conditioning and ventilation equipment, and belongs to the transformation technology of the parallel double axial flow wind wheel system. Background technique [0002] At present, the parallel dual-axial flow wind wheel system used in air conditioning and ventilation equipment, such as the dual-axial flow wind wheel system of the outdoor unit of household air conditioners and central air conditioners Due to the difference in external load and other reasons, the speeds of the two wind turbines cannot be exactly the same, and the speeds of the two wind rotors generally randomly differ from a few revolutions per minute to more than ten revolutions per minute, which leads to a slight deviation in the rotation frequency of the two wind rotors. When the two wind rotors with a small rotation frequency deviation are run...

AI Technical Summary

Problems solved by technology

[0002] At present, the parallel dual-axial flow wind wheel system used in air conditioning and ventilation equipment, such as the dual-axial flow wind wheel system of the outdoor unit of household air conditioners and central air conditioners Due to the difference in the external load and other reasons, the speeds of the two fans cannot be exactly the same, and the speeds of the two wind rotors generally differ randomly by a few revolutions per minute to more than ten revolutions per minute, which leads to a slight deviation in the rotation frequency of the two wind rotors

When the two wind rotors with a small rotation frequency deviation are running, due to the mutual superposition of the rotation noise amplitude and energy, a serious beating noise is generated, resulting in an obvious low-frequency pulsating noise when the outdoor unit system is running. The frequency of the beating vibration is equivalent to the natural frequency of human organs, which makes people feel irritable and uneasy, which seriously affects the sound quality and comfort of use of the outdoor unit of the double wind wheel air conditioner. At the same time, because the two wind wheels rotate at the same fundamental frequency, It may also cause resonance of the sheet metal structure during operation, seriously affecting the reliability of the air conditioning system

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