A test device and test method for friction force and sealing pressure of graphite seal

Abstract

The invention relates to a graphite sealing element frictional force and sealing pressure testing device. The graphite sealing element frictional force and sealing pressure testing device comprises a hydraulic central tube and a frictional central tube, an in-tube space is formed inside the hydraulic central tube and the frictional central tube, and both ends of the in-tube space are closed and connected with a first pump through pipes; a frictional external tube slidingly sleeves the outer wall of the frictional central tube; an accommodating space for accommodating graphite sealing elements is formed between the frictional external tube and the frictional central tube; communicating passages are formed between the accommodating space and the in-tube space; the frictional external tube is threadedly connected with a fastening nut; an external tube sleeves the hydraulic central tube; the first end and the second end of the external tube are threadedly connected with an upper connector and a lower connector respectively in a sealed mode; the outer wall of the hydraulic central tube is provided with a ring-shaped protrusion, which is attached to the inner wall of the external tube in a sealed mode to divide a ring-shaped space into a first cavity and a second cavity; the first cavity is connected with a second pump through pipes. The graphite sealing element frictional force and sealing pressure testing device can help obtain the corresponding relationship among the parameters of fastening torque, roughness, sealing pressure and frictional force.

Description

technical field [0001] The invention relates to a test device and a test method for the performance of a graphite seal, in particular to a test device and a test method for the friction and sealing pressure of a graphite seal. Background technique [0002] The valves used in the petrochemical industry and the thermal recovery packers used in the oil exploration industry all work in high temperature and high pressure working environments. In such a high temperature and high pressure environment, sealing is usually a difficult problem to solve, and the quality of the sealing effect directly affects the performance of the tool. However, under high temperature and high pressure environment, ordinary O-rings cannot work normally. At present, the method of compressing graphite rings is generally used for sealing. The currently used graphite ring seal is to apply a certain torque to the graphite ring, compress the graphite ring, and then make it seal, but the relationship between ...

AI Technical Summary

Problems solved by technology

When the torque is too small, the designed sealing pressure cannot be reached, and when the torque is too large, it will cause excessive friction and make tool control difficult

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