Air conditioner and its control method for the pressure equilibrium

Abstract

The object of the invention is to realize the pressure balancing between the outdoor side of the air conditioner and the piping or between the high pressure side piping and the low pressure side piping to make the compressor work all right. In order to realize the aim, the air conditioner of the invention is characterized by including: a compressor for compressing the refrigerant, a pressure pipe for discharging the high pressure flowing refrigerant and an outdoor machine used in the low voltage tube to make the low voltage refrigerant sucked into the compressor flow; a first piping connecting the high pressure pipe and the indoor machine and a second piping connecting the low pressure pipe and the indoor machine; a bridge type apparatus disposed in the high pressure pipe for controlling the pressure equalizing between the first piping and the second piping; a control unit, for closing the bridge type apparatus when the compressor is operated and opening the bridge type apparatus when the compressor stops.

Description

technical field [0001] The present invention relates to an air conditioner and its piping pressure balance control method, and more particularly, to an air conditioner having more than one outdoor unit, and a common piping connecting the one or more outdoor units to one or more indoor units and the outdoor unit. The air conditioner and its piping pressure balance control method can realize the pressure balance between the compressors so that the smooth operation of the compressor can be achieved. Background technique [0002] Generally, an air conditioner is a device used to compress refrigerant to circulate high-temperature and high-pressure gaseous refrigerant to supply cold or hot air to an indoor space. It consists of an outdoor unit and an indoor unit. The outdoor unit consists of a compressor that compresses refrigerant, The outdoor side heat exchanger that condenses or evaporates the refrigerant through heat exchange, the cooling fan, and ...

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Problems solved by technology

[0009] However, when there are multiple outdoor units and the length of piping connecting the multiple outdoor units and indoor units is long, or when there is only one outdoor unit but the length of piping is long due to the long distance from the indoor unit , the above method has no obvious effect on reducing the pressure difference formed between the outdoor unit side and the piping centered on the compressor, or between the piping side where high-pressure refrigerant flows and the piping side where low-pressure refrigerant flows, and even if it can be reduced Even if the pressure difference is small, it will take a long time

[0010] Especially in refrigeration, there are the following problems: because the high-temperature and high-pressure refrigerant discharged from the compressor passes through the heat exchanger and then passes through the outdoor expansion valve and the one-way valve, and the refrigerant control valve connected in parallel to the one-way valve is always closed, Therefore, when the air conditioner is stopped, even if the pressure difference inside the outdoor unit is relieved by the bypass valve, the refrigerant cannot flow in the reverse direction due to the one-way valve and the refrigerant control valve (one-way valve). , while the refrigerant control valve is closed) makes it difficult to balance the pressure difference between the high-pressure side piping and the outdoor unit side or low-pressure side piping, so that when the compressor is restarted, not only the discharged refrigerant cannot flow through the piping due to the pressure difference Medium flow may cause backflow, and a large load is placed on the compressor, making it difficult to start the compressor

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