Control system and control method of parallel-connection four-way valve for multi-line machine

Abstract

The invention discloses a control system and a control method of a parallel-connection four-way valve for a multi-line machine. The control system comprises a first condenser, a first electronic expansion valve, a second condenser, a second electronic expansion valve, a compressor exhaust pipe, a compressor air return pipe, an air side stop valve, a liquid side stop valve, a first four-way valve, a second four-way valve and a one-way valve; two our-way valves and two condensers are connected in parallel to meet the high-flow refrigerant requirement in full load; when the second four-way valve is electrified, as the one-way valve is conducted uni-directionally and is cut off in a reverse direction, the purpose of switching off half of condensers is achieved; the system adopts the small four-way valve without the large four-way valve, has the simple structure and the low cost, meets the high-flow refrigerant requirements in full load, and also can switch off half of the condensers in low load. The invention also provides the control method based on the control system.

Description

technical field [0001] The invention relates to the technical field of air conditioning, in particular to a control system and control method for a parallel four-way valve for multiple machines. Background technique [0002] The multi-connected air-conditioning system entered the Chinese market in the 1990s. With its advantages of free control, high efficiency and energy saving, and easy installation and maintenance, it quickly occupied an important position in the central air-conditioning market. [0003] The use of a large number of multi-connected external units is equivalent to 2-3 small multi-connected external units connected in parallel. Although the large external unit has the disadvantage of inconvenient transportation and handling, it has the advantages of lower cost and simpler and more convenient installation. There are also many market shares in the multi-line market. [0004] The large number of multi-connected external units are generally connected in paralle...

AI Technical Summary

Problems solved by technology

[0006] Large four-way valves are expensive and difficult to purchase, and the operation reliability of large four-way valves is also lower than that of four-way valves;

[0007] Two small four-way valves are used in parallel to replace the large four-way valve, and a small four-way valve is used in series to shut off half of the condensers when the load is small, which has the problems of complex structure and high cost

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