Low-temperature refrigeration air conditioner and wind speed control method thereof

Abstract

The invention discloses a low-temperature refrigeration air conditioner and a wind speed control method thereof. The low-temperature refrigeration air conditioner comprises a wind speed control deviceof an outdoor unit fan. The wind speed fan control device comprises a temperature detection unit, a fan control unit and the outdoor unit fan, wherein the temperature detection unit detects the temperature of a condenser of the air conditioner so as to obtain a simulated condensation temperature; the fan control unit generates control signals of the rotation speed change and on-off of the fan according to the simulated condensation temperature; and the outdoor unit fan responds to the control signals of the fan control unit and generates corresponding outdoor unit wind speed. The method for controlling the wind speed of the low-temperature refrigeration air conditioner controls the rotation speed change and on-off of the fan by simulating the condensation temperature of the condenser so as to provide different wind speeds for an outdoor unit. Because of simulating a pressure signal by detecting a temperature signal, the air conditioner and the method avoid direct contact between a wind speed control system and a refrigerant system so as to avoid leakage.

Description

technical field [0001] The invention relates to a low-temperature refrigeration air conditioner and a wind speed control method thereof. Background technique [0002] With the improvement of people's living standards, energy-saving and environmentally friendly R410A inverter air conditioners are widely demanded in Europe and other countries, especially in some Nordic countries, which require air conditioners to achieve low-temperature refrigeration requirements in addition to ordinary refrigeration and heating functions. [0003] In order to realize the low-temperature refrigeration function, a wind speed controller is generally used. The wind speed controller is connected to the refrigerant system, and the wind speed of the outdoor fan is controlled by detecting the operating pressure of the system, so as to ensure that the machine operates at a suitable condensing temperature. [0004] In the process of implementing the technical solution of the present invention, the inve...

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Problems solved by technology

[0004] In the process of implementing the technical solution of the present invention, the inventor found that the main problem in the prior art is: the wind speed controller is installed in the refrigerant pipeline, and leakage is likely to occur due to temperature changes

[0005] In addition, for relatively small outdoor units, the space for installing the wind speed controller is small, and maintenance is inconvenient. At the same time, because the output voltage to the motor is changed through the wind speed controller, the motor is prone to heat generation and damage.

[0006] Moreover, cooling and heating generally operate at the same speed. Due to the condensation of condensed water outdoors during heating, the wind resistance increases, and the speed of the external unit is lower than that of cooling, thereby weakening the outdoor heat transfer and reducing the heating effect.

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