Three-pipe heat recovery multi-connected machine and control method thereof

Abstract

The invention relates to a three-pipe heat recovery multi-connected machine, which comprises an outdoor machine and more than two indoor machines, wherein the outdoor machine and the indoor machines are connected by a high pressure liquid pipe, a low pressure air return pipe and a high pressure air pipe; the outdoor machine comprises a compressor, an outdoor heat exchanger, a four-way valve and athrottling device; the outdoor heat exchanger comprises a first outdoor heat exchanger and a second outdoor heat exchanger; the four-way valve comprises a first four-way valve, a second four-way valve and a third four-way valve; the throttling device comprises a first throttling device and a second throttling device; one end of the first outdoor heat exchanger is connected with a first connectionpipe of the first four-way valve, and the other end of the first outdoor heat exchanger is connected with the first throttling device; one end of the second outdoor heat exchanger is connected with afirst connection pipe of the second four-way valve, and the other end of the second outdoor heat exchanger is connected with one end of the second throttling device; and the other end of the first throttling device and the other end of the second throttling device are respectively connected with the high pressure liquid tube. The three-pipe heat recovery multi-connected machine provided by the invention has the characteristics of simple and reasonable structure and high energy efficiency ratio.

Description

technical field [0001] The invention relates to a three-pipe heat recovery multi-line unit and a control method thereof. Background technique [0002] The existing three-pipe heat recovery multi-line outdoor heat exchanger is an integral heat exchanger, which can only be used as a condenser or an evaporator. For example, Chinese Patent Document No. CN 200979258Y disclosed a three-pipe heat recovery air-conditioning system on November 21, 2007, including an outdoor unit system and an indoor unit system. The outdoor unit system includes a compressor, a condenser, a four-way valve, Low-pressure tank, outdoor unit electronic expansion valve, high-pressure pipe, medium-pressure pipe, low-pressure pipe, and high-pressure pipe cut-off solenoid valve, medium-pressure pipe cut-off solenoid valve, and low-pressure pipe cut-off solenoid valve respectively arranged on the corresponding pipelines, indoor unit system It includes a number of indoor units, three-way switching devices and t...

AI Technical Summary

Problems solved by technology

When the outdoor heat exchanger is used as a condenser, it can only adjust the condensation temperature of the system. When the outdoor heat exchanger is used as an evaporator, it can only adjust the evaporation temperature of the system, but cannot adjust the condensation temperature and evaporation temperature of the system at the same time, so it cannot At the same time, ensure the cooling and heating effect of the indoor unit

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