Heat recovery type multi-connection air condition unit

Abstract

The invention discloses a heat recovery type multi-connection air condition unit, comprising at least one outdoor unit, a plurality of indoor units and at least one hot and cold converter. The outdoor unit comprises a compressor, an outdoor heat exchanger, a subcooler, two four-way reversing valves and three refrigerant pipelines; each indoor unit comprises an indoor heat exchanger; and the hot and cold converter comprises expansion valves and a bypass capillary, wherein the expansion valves control the on-off of a high pressure air pipe and a low pressure air pipe, and the bypass capillary is arranged between the high pressure air pipe and the low pressure air pipe. When the indoor unit connected with the hot and cold converter is used for heating, the expansion valve at the high pressure air pipe side is turned on and the expansion valve at the low pressure air pipe side is turned off to realize the connection of the air pipe of the indoor unit and the high pressure air pipe. When the indoor unit connected with the hot and cold converter is used for cooling, the expansion valve at the low pressure air pipe side is turned on and the expansion valve of the high pressure air pipe is turned off to realize the connection of the air pipe of the indoor unit and the low pressure air pipe. By the air condition unit, the combination of the units as well as the function of two-pipe heat pump air condition can be realized, and the common two-pipe heat pump air conditioner and the heat recovery type air conditioner capable of cooling and heating simultaneously are effectively combined.

Description

[0001] technical field [0002] The invention relates to a heat recovery air-conditioning system, in particular to a heat recovery multi-connected air conditioner unit with a single outdoor heat exchanger that can be combined in modules and also takes into account the air-conditioning function of a two-pipe heat pump. Background technique [0003] The air conditioner is a device that uses the evaporation and condensation of the circulating refrigerant to transfer heat from the indoor to the outdoor or from the outdoor to the indoor, thereby realizing the cooling or heating of the indoor unit. A common air conditioner is an outdoor unit connected to an indoor unit, so the functions and control of the machine are relatively simple to implement. In recent years, multi-split units have developed rapidly, that is, one outdoor unit can be connected to multiple indoor units, and each indoor unit can operate independently. And these indoor units can only perform cooling or heating op...

AI Technical Summary

Problems solved by technology

[0004] The existing heating and cooling heat recovery air conditioners cannot be used as ordinary two-pipe cooling and heating switching air conditioners. A cooling and heating conversion device must be added in the middle. Without a cooling and heating conversion device, it will not be able to be installed and operated, and generally only individual outdoor units operate. Unable to realize module combination operation

But now there are many occasions where it is necessary to install an ordinary two-pipe cooling and heating switchable air conditioner or a heat recovery air conditioner. the inconvenience

[0005] The existing heat recovery air conditioner with simultaneous cooling and heating cannot realize the flexible switching of the outdoor heat exchanger because there is only one four-way reversing valve in the system. Uncomfortable, and it is more troublesome to realize the control

Existing modular air-conditioning indoor units cannot perform cooling and heating at the same time, and oil equalization has always been a difficulty that plagues the modularization of outdoor units, and is generally achieved through a separate oil equalization pipeline

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