A multi-connected internal valve adaptive control method and a multi-connected air conditioner

Abstract

The invention provides a multi-connected indoor unit valve adaptive control method and a multi-connected air conditioner, which relate to the technical field of air conditioners. The self-adaptive control method of multi-connected internal machine valves includes: when the internal machine valve fluctuates repeatedly, if △T≥△T 基准1 ≥T 0 , then the internal machine valve is controlled to operate under the reference opening PMV1; if △T 基准1 ≥△T≥T 0 or △T<T 0 , then the internal machine valve is controlled to operate under the modified opening PMV2; where △T is the maximum value of superheat in the preset cycle △T max with the minimum value △T min mean value of △T 基准1 is the reference superheat degree of the internal machine valve operating under the reference opening PMV1, T 0 For safe superheat, PMV2>PMV1. This method controls the opening of the internal machine valve more reasonably and has better reliability, which can ensure the stability of the opening of the internal machine valve and the stable pipe temperature of the internal machine, which is conducive to the stable operation of the system and reduces the risk of liquid return.

Description

technical field [0001] The invention relates to the technical field of air conditioning, in particular to a multi-connected internal unit valve self-adaptive control method and a multi-connected air conditioner. Background technique [0002] Multi-connected air conditioner is a type of user's central air conditioner, commonly known as "one-to-many", which means that one outdoor unit is connected to two or more indoor units through piping. Primary refrigerant air conditioning system in the form of evaporative heat exchange. Multi-connected air conditioners are increasingly widely used in small and medium-sized buildings and some public buildings. [0003] At present, the valve control of the indoor unit of the multi-split air conditioner is generally controlled by the target superheat degree. However, during low-load operation, due to the small opening of the internal unit valve, the adjustment range is small, and it is easy to fluctuate, resulting in repeated fluctuations i...

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Problems solved by technology

[0004] The problem solved by the present invention is that the tube temperature of the internal unit of the multi-split air conditioner fluctuates repeatedly, which is not conducive to the stable operation of the system, and the risk of liquid return is relatively high

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