Research On The Mechanical Seal CAT Device And The Performance Of The GY70 Mechanical Seal

leakage problem exists commonly for fluid machinery used in the processindustry. Generally, leakage accident may result in fire hazards or explosion disasters,which will lead to enormous economy loss, personal injury and environment pollution.Mechanical seal is widely used in rotation axis seal. Its running condition hassignificant influence on the whole machine, the complete set of device and even thesafety in production of the whole factory. Especially in the petroleum chemicalindustry enterprises, mechanical seals play an important role in assuring theequipment's reliable operation and the unit's continuous production. Mechanical seal technology develops very fast in recent years, and themechanical seal product becomes the most important rotating seal in the fluid sealingfield. Great progress has also been made in theoretical research aspect. But owing tovarious structures and operation conditions, a complete mechanical seal theory systemis still not come into being up to now. There are different points of view about sealingmechanism in academic circle. So large quantities of theoretical and experimentalinvestigations are necessary in order to establish a complete mechanical seal theorysystem. On the basis of the requirement of the mechanical seal modeling test andscientific research test, a new mechanical seal computer aided testing device has beendeveloped. The main performances of mechanical seals can be measured in thisdevice, in which the spring pressure can be dynamically adjusted. Utilizing this device,large numbers of experimental investigations on mechanical seals are carried out. Computer aided testing device of the mechanical seal system includes two majorparts, the mechanical system and the computer data acquisition system. Themechanical system is composed of test-bed, pump station, pressurized and holddevice of test medium. The computer data acquisition system is composed of sensors,data acquisition circuits, serial communication controlling circuit, combined powersupply and computer. The testing device can measure the spring pressure andvibration under dynamic conditions. It is an effective means to evaluate theperformance of the mechanical seals in service and new developed mechanical sealproducts. In the Computer aided testing device of the mechanical seal system, the IIABSTRACTexperimental investigations on the basic performance of the GY70 mechanical sealhas been carried out. The influence of the spring pressure, medium pressure and therotate speed on the leakage rate and frictional power consumption of the mechanicalseal have been investigated. It has been found out that an optimum operation pointexists for this type of mechanical seal, and it can be achieved by means of controllingthe spring pressure. The friction characteristic of the seal face is one of the basic properties of themechanical seal. The face friction mechanisms of the mechanical seal are discussed,and the method of judging the face friction condition is summarized in this thesis. Theface friction characteristic of the GY70 mechanical seal and its influence on theleakage rate and working life are also studied.