In the production operations of various types of centrifugal compressors in the petrochemical industry, in order to meet the needs of production load changes in a timely manner, the speed of the compressor must be adjusted in a timely manner. Generally speaking, the speed adjustment method of a centrifugal compressor generally has the following two types of compressors driven by a steam turbine, and the speed adjustment is generally achieved by developing an earlier governor and a governor developed in recent years. To realize, this type of governor is characterized by complex structure and control system, and the inspection and maintenance is not convenient, but the speed adjustment is accurate. The second is the compressor driven by the motor, and the speed adjustment is realized by the fluid coupling. The characteristics of this type of governor are that the structure and control system are relatively simple, and the inspection and maintenance are convenient, but the speed adjustment is not very accurate.

However, compared with the two, the speed control function of the fluid coupling still has a very strong potential advantage in some aspects. The main working principle is to change the working volume by changing the working volume between the pump wheel and the vortex. The amount of oil causes the working oil in the working chamber to flow along the outer edge of the pump blade flow path. After the liquid flows out, the circulating oil pump wheel is illustrated. The schematic diagram of the hydraulic coupling is shown in the schematic diagram of the hydraulic coupling structure. Working chamber pump wheel housing scoop tube chamber scoop tube drain tube fuel tank fuel injection tube main circulation oil pump components mainly composed of several parts of the rotating component input side input shaft bearing shell pump wheel housing. The output side turbine output shaft oil supply assembly is mainly composed of an input bearing bearing pump housing oil pump suction pipe.

The working oil supply pump adopts a single-tooth difference internal meshing cycloidal rotor pump and is installed in the pump casing of the input end of the fluid coupling, and is driven by the gear pair between the input shaft and the pump shaft. The oil draining assembly is mainly composed of a scoop pipe drain pipe and an output bearing support. The instrument system is mainly composed of the coupling inlet and outlet oil temperature gauge and the outlet oil pressure gauge tachometer. There are also components such as tank oil cooler oil standard electric heaters. Speed ​​regulation principle When the fluid coupling is rotating, the working oil supply pump draws oil from the fluid coupling tank through the cooler to the oil inlet chamber in the spoon tube housing, and enters the working chamber through the pump wheel oil port.