Refrigerating plant

Abstract

The invention discloses a refrigerating plant which comprises a compressor, a control device, a condenser, an evaporator and a control pipeline. The compressor comprises a shell. A normal running air cylinder and a volume-variable air cylinder are arranged in the shell. The normal running air cylinder is provided with a normal running air suction port. The volume-variable air cylinder is provided with a volume-variable air suction port. The control device comprises a first control port, a second control port, a third control port and a fourth control port. One end of the condenser is connected with the first control port. One end of the evaporator is connected with the fourth control port. The other end of the evaporator is connected with the other end of the condenser. The control pipeline is connected between one end of the condenser and the volume-variable air suction port. According to the refrigerating plant, the control pipeline is additionally arranged between one end of the condenser and the volume-variable air suction port, and therefore the change of the volume of the compressor can be controlled through the pressure difference; and the normal running air cylinder works during refrigerating, the normal running air cylinder and the volume-variable air cylinder both work during heating, and therefore the requirements for heating and refrigerating are met. Meanwhile, the refrigerating plant is simple in structure, convenient to control and low in cost.

Description

technical field [0001] The invention relates to the technical field of freezing devices, in particular to a freezing device. Background technique [0002] Insufficient low-temperature heating capacity is a major criticism of current air-conditioning systems, and variable capacity technology is an effective way to solve this problem. In related technologies, the variable capacity technology is to control the change of capacity by setting a special three-way solenoid valve or four-way solenoid valve on the system. However, this method is costly and it is difficult to promote the variable capacity technology in batches. In addition, Although the variable capacity technology changes the basic displacement of the compressor, if the reversing of the four-way valve (three-way valve) is controlled by parameters such as pressure ratio or temperature to achieve volume change, it will bring troubles in control, especially For multi-cylinder variable capacity compressors, from single c...

AI Technical Summary

Problems solved by technology

In related technologies, the variable capacity technology is to control the change of capacity by setting a special three-way solenoid valve or four-way solenoid valve on the system. However, this method is costly and it is difficult to promote the variable capacity technology in batches. In addition, Although the variable capacity technology changes the basic displacement of the compressor, if the reversing of the four-way valve (three-way valve) is controlled by parameters such as pressure ratio or temperature to achieve volume change, it will bring troubles in control, especially Multi-cylinder variable capacity compressors change from single cylinder to multi-cylinder, the load curve of the pump body changes, and the required control parameters are also different, which leads to difficulties in the implementation of control, and also hinders the implementation of variable capacity technology.

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