Household air conditioner with different capacities of fixed-speed double compressors and control method thereof

Abstract

The invention discloses a household air conditioner with different capacities of fixed-speed double compressors and a control method thereof. The air conditioner comprises four parts, namely an indoor unit, an outdoor unit, an indoor control device and an outdoor control device. The indoor unit consists of an indoor heat exchanger, an indoor fan, two capillary pipes and four electromagnetic valves; the outdoor unit consists of different capacities of fixed-speed double compressors, a compressor current detection circuit, four electromagnetic valves, a four-way valve for changing the flowing direction of a refrigerant and a gas-liquid separator; and the communication between the indoor control device and the outdoor control device is performed in a power carrier mode. The control devices acquire the thermodynamic characteristics of a room where the air conditioner is arranged based on a statistical theory and a statistical method, dynamically modify a self-adjusting switching rule of the double compressors, improve the energy efficiency ratio of the air conditioner, and improve the comfort level of human bodies; and the control devices adopt a preset temperature upper / lower limit starting / stopping rule embedded with the self-adjusting switching rule of the double compressors to control the air conditioner, and the compressor current detection circuit ensures that a double compressor system structure has high availability.

Description

technical field [0001] The invention relates to the technical field of fixed-speed household air conditioners, in particular to a household air conditioner with fixed-speed dual compressors of different capacities and a control method thereof. Background technique [0002] In 1965, the first domestic air conditioner was born in Shanghai. In 2007, my country's annual output of air conditioners was 89.917 million units, accounting for 70% of global production. At present, domestic mainstream household air conditioners are heat pump type fixed speed unit air conditioners. The advantages of fixed-speed unit air conditioners are: mature technology, reliable quality, independent measurement, convenient installation and maintenance, simple cold (heat) adjustment, low price, etc.; the disadvantages are: low energy efficiency ratio, poor comfort, etc. In the 1980s, Japan's Toshiba Corporation introduced variable-frequency speed-regulating air conditioners. Its control system, namel...

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Problems solved by technology

The advantages of fixed-speed unit air conditioners are: mature technology, reliable quality, independent measurement, convenient installation and maintenance, simple cold (heat) adjustment, low price, etc.; the disadvantages are: low energy efficiency ratio, poor comfort, etc.

In the 1980s, Japan’s Toshiba Corporation launched frequency-variable speed-regulating air conditioners. Its control system, namely energy regulation, is different from fixed-speed air conditioners, but the core refrigeration system has not been substantially improved.

Third, point-to-point direct control of a single compressor is not suitable for multi-compressor air conditioners. With the maturity of power carrier technology, the indoor / outdoor control devices of air conditioners adopt power carrier communication, which is expected to reduce the installation workload and improve the reliability of air conditioners

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