Inverter air conditioner and refrigerating operation method thereof

Abstract

The invention relates to an inverter air conditioner and a refrigerating operation method thereof. By adopting a detector arranged outdoors alone to detect temperature and duct refrigerant pressure and a method and compositely regulating and controlling the rotation speed of a condensing fan and the heat exchange area of a condenser through which refrigerant flows, the invention purposefully decreases the heat exchange rate of the condensing side and effectively increases the post-condensation refrigerant pressure of refrigerating operation under the low-temperature state in order to ensure that a compressor operates within a reliable parameter range and is protected from being damaged. The inverter air conditioner comprises an indoor unit, an outdoor unit and a refrigerant-circulating duct connected with the indoor unit and the outdoor unit; the outdoor unit is provided with the compressor, the condenser, the condensing fan and a throttle; and the indoor unit is provided with an evaporator and an evaporating fan. A group of electromagnetic valves are arranged at the inlet and outlet of at least one route of refrigerant duct of the condenser; and a temperature sensor which senses the outside environmental temperature and sends the sensed temperature value to a control system is arranged on one side of the outdoor unit.

Description

technical field [0001] The invention relates to a variable-frequency air conditioner and a cooling operation method thereof which are applied to places where cooling operation is performed throughout the year, and belongs to the technical field of air-conditioning and refrigeration engineering. Background technique [0002] The existing air conditioners sold and used in the domestic market generally adopt frequency conversion energy-saving technology to adjust the operating power of compressors and other cooling devices according to the temperature difference between indoor and outdoor environments, and realize the optimal ratio of energy consumption and system load. [0003] Under conditions such as continuous use throughout the year, such as a fully enclosed communication base station, no matter how the external ambient temperature changes (such as reaching minus 20 to 30 degrees), the interior of the base station must be set in cooling operation mode. The outdoor temperat...

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Problems solved by technology

[0004] However, when the outdoor temperature drops to a lower range, even if the operation of the condensing fan is stopped, the amount of heat exchanged only through the copper tubes and fins on the surface of the condenser and the external ambient air is still relatively large, which is more likely to cause system tube failure. Too much pressure drop after condensation inside the road

When the refrigerant pressure value is lower than the allowable standard range of the compressor, it will directly cause damage to the compressor during operation and shorten the service life of the compressor

[0005] In addition, it is not accurate to simulate the system pipeline pressure by detecting the temperature value of the coil on the surface of the condenser

Especially in the outdoor low temperature environment, the coil temperature deviates greatly from the real temperature and pressure of the refrigerant inside the actual pipeline, and the control accuracy is poor, which also directly affects the system energy consumption control of the cooling operation

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