Variable-frequency air conditioning system with large refrigeration capacity, air conditioner and control method for throttling device of variable-frequency air conditioning system

Abstract

The invention relates to a variable-frequency air conditioning system with large refrigeration capacity, an air conditioner and a control method for a throttling device of the variable-frequency air conditioning system. The variable-frequency air conditioning system comprises a controller, the throttling device, a four-way valve, a condenser, an evaporator, a compressor, a gas-liquid separator, a pressure sensor and an exhausting temperature wrap. The throttling device comprises an electronic expansion valve and a capillary throttle valve. The electronic expansion valve communicates with the condenser and the evaporator. The capillary throttle valve communicates with the condenser and the evaporator. The air conditioner comprises the variable-frequency air conditioning system with large refrigeration capacity. The control method comprises the following steps that the exhausting pressure value and the exhausting temperature value of the variable-frequency air conditioning system are obtained; when the exhausting pressure value is smaller than the preset pressure threshold, the temperature difference between the exhausting temperature value and the preset pressure threshold is calculated; the condition that the temperature difference is within the target exhausting temperature range or not is judged; if yes, a control signal is generated; and the control signal is sent to the throttling device. Different target exhausting temperature values can be set according to different environment temperatures, so that the reliability of the variable-frequency air conditioning system is improved.

Description

technical field [0001] The invention relates to the technical field of air conditioning, in particular to a large cooling capacity frequency conversion air conditioner system, a large cooling capacity frequency conversion air conditioner and a control method for a throttling device of the large cooling capacity frequency conversion air conditioner system. Background technique [0002] With the development of science and technology and social economy, the progress of science and technology is affecting the social economy and changing people's way of life. The throttling device is an important component of the air conditioner. For the air conditioner, the flow rate of the throttling device determines the amount of refrigerant circulation in the system. For commercial air conditioners with large cooling capacity, capillary throttling and thermal expansion valve throttling are mostly used at present. [0003] However, air conditioners using capillary throttling and thermal expa...

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Problems solved by technology

[0004] 1. The disadvantage of using capillary throttling is that the flow cannot be adjusted, especially for inverter air conditioners or unloadable variable capacity air conditioners, it is difficult to meet the flow requirements of full load and low load at the same time

When the ambient temperature changes or the air-conditioning load changes, the capillary flow cannot be adjusted, which has a great impact on the capacity, energy efficiency and operation reliability of the unit.

[0005] 2. The disadvantages of using thermal expansion valves are: Although the air conditioner can adjust the flow according to different ambient temperatures and loads, the adjustment range is small, and it is difficult to meet the flow adjustment requirements of large cooling capacity inverter air conditioning systems, especially multi-connected air conditioners.

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