Air conditioner outdoor fan speed control device

Abstract

The invention discloses a speed control device of an outdoor draught fan of an air conditioner. The speed control device of the outdoor draught fan of the air conditioner comprises a driving circuit, a transformer with multiple levels of outputs, a contactor and a switching control module. According to the speed control device of the outdoor draught fan of the air conditioner, the transformer with the multiple levels of outputs is adopted, switching of the different levels of outputs of the transformer is achieved through the controllable contactor when the device works, and the switching control module carries out control switching on the contactor based on detected working pressure of the air conditioner so that the draught fan can correspondingly work under the condition of different voltages and then can operate at corresponding rotating speeds and be matched with the working pressure of the air conditioner. The speed control device of the outdoor draught fan of the air conditioner has the advantages of being low in cost and free of influence of electromagnetic noise during work. Compared with a chopping voltage reducing speed control device, the speed control device of the outdoor draught fan of the air conditioner has the advantages of being capable of reducing cost, free of low-frequency noise and low in failure rate.

Description

technical field [0001] The invention relates to the control technology of an outdoor fan of an air conditioner, in particular to a speed regulation control device for an outdoor fan of an air conditioner. Background technique [0002] Generally speaking, in order to adapt to the requirements of different environmental conditions, the outdoor unit of the air conditioning unit needs to control the speed of the fan when the unit is running at different ambient temperatures to maintain a suitable range of condensing pressure or water temperature. At present, the more commonly used speed regulation methods include stepless regulation and on / off regulation. Stepless regulation is to control the frequency or voltage of the fan through frequency conversion or variable voltage (mainly chopping voltage regulation) to change the speed of the fan to change the air volume. Maintain a stable pressure or water temperature; on / off regulation is to control the on-off of the fan through the p...

AI Technical Summary

Problems solved by technology

[0003] Frequency conversion speed regulation needs to add a frequency converter, which is costly and has electromagnetic noise; while chopper variable voltage speed regulation needs to add a variable voltage speed regulator, its low frequency noise is very large, and it will cause resonance; on / off speed regulation is It is simple and practical to control the fan through the switch type pressure (temperature) controller, but it can only be adjusted by turning on and off the fan, which will cause the system pressure to be unstable

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