Air conditioner and control method thereof

Abstract

The invention discloses an air conditioner and a control method thereof. The air conditioner comprises an outdoor heat exchanger, a four-way valve, a compressor, an indoor heat exchanger and a throttle valve, wherein the throttle valve is in tandem connection between the indoor heat exchanger and the outdoor heat exchanger and has two gears with different flows. The air conditioner control method comprises the following steps: presetting a first frequency F1 and a second frequency F2 of a compressor in the refrigeration cycle of the air conditioner; when the air conditioner operates, carrying out step 1: detecting the operation mode of the air conditioner and the operation frequency f of the compressor, if the refrigeration cycle is obtained, entering into step 2, and if heating cycle is obtained, entering into step 5; and carrying out step 2: comparing the operation frequency f with the first frequency F1, if the operation frequency f is more than or equal to the first frequency F1, entering into step 3, and if the operation frequency f is less than the first frequency F1, entering into step 4. The invention has the characteristics of simple and reasonable structure, flexible operation, low manufacturing cost and wide applicable range.

Description

technical field [0001] The invention relates to an air conditioner, in particular to an air conditioner and a control method thereof. Background technique [0002] Inverter air conditioners can adjust the operating frequency within a certain range as the load changes to change the output capacity. When the frequency is high, it can achieve rapid cooling or heating, and when the frequency is low, the output is reduced to achieve the purpose of energy saving. However, if the ordinary inverter air conditioner adopts capillary throttling, the energy efficiency ratio of the ordinary inverter air conditioner can only be optimized at a certain frequency when cooling or heating due to the fixed cooling capillary flow and heating capillary flow. When operating at other frequencies, the energy efficiency is not in the optimal state, which is manifested in the fact that the annual energy consumption efficiency SEER, the heating season energy consumption efficiency HSPF and the cooling...

AI Technical Summary

Problems solved by technology

However, if the ordinary inverter air conditioner adopts capillary throttling, the energy efficiency ratio of the ordinary inverter air conditioner can only be optimized at a certain frequency when cooling or heating due to the fixed cooling capillary flow and heating capillary flow. The energy efficiency is not optimal when running at other frequencies, which means that the annual energy consumption efficiency SEER, the heating season energy consumption efficiency HSPF and the cooling season energy consumption efficiency APF are not high

At the same time, due to the fixed capillary flow rate, when ordinary inverter air conditioners operate at high frequencies, exhaust temperature protection often occurs under many working conditions, so that ordinary inverter air conditioners cannot maintain high-frequency operation and cannot achieve rapid cooling or heating. Purpose

[0003] In order to solve these problems, some high-end inverter air conditioners on the market now start to use electronic expansion valves to throttle, which can improve energy efficiency and effectively avoid exhaust temperature protection, etc. many

[0004] Fixed-speed air conditioners generally use capillary throttling, but due to the fixed capillary flow, exhaust protection often occurs under severe working conditions. In low-temperature conditions, the heating capacity is low, and the blowing air of the air conditioner is relatively cool, causing customer dissatisfaction

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