Graphite sealing element frictional force and sealing pressure testing device and method

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 testing device and a testing method for the performance of a graphite seal, in particular to a testing device and a testing method for the friction and sealing pressure of the graphite seal. Background technique [0002] Valves used in the petrochemical industry, and thermal packers used in the oil extraction industry, work in a high temperature and high pressure working environment. In this 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, in the high temperature and high pressure environment, the general O-ring seal cannot work normally, and the graphite ring is generally compressed for sealing at present. The graphite ring seal currently in use applies a certain torque to the graphite ring to compress the graphite ring and then seal it. However, the relationship between the torque and the ...

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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