An improved multi-line system and its control method

Abstract

The present invention relates to an improved multi-line system, including a compressor, an outdoor heat exchanger and an indoor heat exchanger, the outdoor heat exchangers are two: heat exchanger I and heat exchanger II; the indoor heat exchanger There are multiple devices; the first end of the heat exchanger I is connected to the suction port of the compressor through the solenoid valve I and the exhaust port of the compressor through the solenoid valve II; The first end is connected to the suction port of the compressor through the solenoid valve IV and the discharge port of the compressor through the solenoid valve III; the second end of the heat exchanger I and the second end of the heat exchanger II After being connected in parallel with each other, they are connected to the middle end of each indoor heat exchanger; the middle end is respectively connected to the liquid end and the gas end of the indoor heat exchanger after passing through the heating check valve and the cooling check valve. The invention can perform refrigeration and heating at the same time, meet the user's multi-mode operation requirements, and realize heat recovery. It can also solve the energy-demand matching problem during small-load operation and improve energy utilization.

Description

technical field [0001] The invention relates to an air conditioner, in particular to a multi-connection system, in particular to an improved multi-connection system and a control method thereof. Background technique [0002] With the development of multi-connected air conditioner technology, single-mode operation units can no longer meet the needs of users. For example, in changing seasons, different indoor units of the same multi-connected system may have different requirements, requiring the units to provide cooling and heating functions at the same time; in public places such as hotels and guesthouses, a user of the multi-connected In the operation mode (such as turning on the heating mode by mistake in summer), other users with normal needs will not be able to open the desired operation mode due to problems such as mode conflicts, causing inconvenience. On the other hand, with the improvement of awareness of energy saving and emission reduction, the demand for heat reco...

AI Technical Summary

Problems solved by technology

These problems are difficult to be properly solved by the current multi-connected system operating in a single mode

[0003] In addition, the continuous improvement of the single unit capacity of multi-connected outdoor units will inevitably bring about problems such as small-load operation, especially in cooling mode. Excessively high output of outdoor units not only poses challenges to the reliable and long-term operation of the unit, but also leads to problems with multi-connected units. Reduced operating efficiency of the system, resulting in energy waste

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