High-pressure screw pump suction inlet end sealing structure for natural gas hydrate pipe conveying

Abstract

The invention discloses a high-pressure screw pump suction inlet end sealing structure for natural gas hydrate pipe conveying. The right end of an inlet end shell (2) is connected with a sealing box (3). A step hole is formed in the right end of the inlet end shell (2). A sealing cavity lubricating oil outlet (7) is formed in the sealing box (3). A sealing cavity lubricating oil inlet (6) and the sealing cavity lubricating oil outlet (7) both communicate with a closed oil cavity (4). A spiral groove (12) arranged in the length direction of a spring seat (10) is formed in the column face of the spring seat (10). The spiral groove (12) is located in the left side of the sealing cavity lubricating oil outlet (7). A rod cavity (15) is connected with the sealing cavity lubricating oil inlet (6) and the sealing cavity lubricating oil outlet (7). The high-pressure screw pump suction inlet end sealing structure has the beneficial effects that the service life of a mechanical seal is prolonged; thoughts are provided for similar high-pressure sealing problems; tight sealing is achieved; and the sealing problem that the pressure of screw pump inlet hydrate slurry is high is solved.

Description

technical field [0001] The invention relates to a structure of a suction port of a high-pressure screw pump, in particular to a sealing structure of a suction port end of a high-pressure screw pump used for pipeline transportation of natural gas hydrate. Background technique [0002] Natural gas hydrate, also known as "combustible ice", is an unconventional energy source with high density and high calorific value (1m 3 Gas hydrates can release 164m 3 methane gas and 0.8m 3 Water), which mainly exists in the form of ice between the seabed rock layers, and is extremely rich in resources. During the drilling process of marine gas hydrate layers, the hydrate particles return to the drilling platform with the drilling fluid. The pipe flow in this process is different from the conventional oil and gas drilling process: during the upward return process of gas hydrate, the pressure keeps decreasing and the temperature keeps rising. After reaching a certain position, the gas hydra...

AI Technical Summary

Problems solved by technology

Since the natural gas hydrate slurry is a hydrate slurry containing three phases of gas, liquid and solid, it is the hydrate slurry that needs to be sealed. Since the solid phase of the river sand contained in the hydrate slurry is abrasive, it is easy to damage the seal. structure, there is a defect of short service life, so no suitable sealing structure has been found

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