Double-mechanical sealing device in oil-gas mixed delivery pump

Abstract

The invention discloses an oil-gas mixture pump-purpose double mechanical seal device which can be used for a long term under superproportional gas-oil multiphase environment. The device comprises a set of internal mechanical seal and a set of external mechanical seal which are arranged between a pump body and a pump shaft and separate a cavity between the pump body and the pump shaft into a sealing cavity and a liquid sealing cavity; each set of mechanical seal comprises a transmission set, a moving ring and a static ring; the transmission set is fixed on the pump shaft; the moving ring is fixed on the transmission set; the static ring is fixed on the pump body; the transmission set is processed with an axial spring hole; one end of a spring in the spring hole pushes against the bottom of the spring hole, and the other end thereof pushes against the bottom of the moving ring, thereby causing the sealing surface of the moving ring to be tightly clung to the sealing surface of the static ring; the upper part and the lower part of the pump body are respectively provided with a liquid inlet and a liquid outlet which are communicated with the liquid sealing cavity; the static ring of the internal mechanical seal is provided with at least one through groove and at least one semi-circular groove at the inner edge of the sealing surface; and the external circumferential surface of the moving ring of the external mechanical seal is provided with pumping thread. The device is mainly used in a marine oil-gas mixture pump.

Description

technical field [0001] The invention relates to a mechanical seal device, in particular to a double mechanical seal device in an oil-gas mixed transport pump. Background technique [0002] The structure of the double mechanical seal device in the current oil-gas mixed pump includes: two sets of inner and outer mechanical seals arranged between the pump body and the pump shaft, and the two sets of mechanical seals separate the cavity between the pump body and the pump shaft into Sealing cavity and liquid sealing cavity, each set of mechanical seal includes: transmission sleeve, shaft sleeve O-ring, moving ring O-ring, moving ring, static ring and static ring O-ring, the transmission sleeve is fixed on the pump shaft and passed through The shaft sleeve O-ring is sealed with the pump shaft. The moving ring is fixed on the transmission sleeve and sealed with the transmission sleeve through the moving ring O-ring. The static ring is fixed on the pump body and sealed with the pump...

AI Technical Summary

Problems solved by technology

However, in the actual use process, due to the very low ratio of oil (the oil-gas mixed transmission ratio is 1:9), sometimes even the pipeline is full of gas, so that the dynamic and static ring end faces of the above-mentioned mechanical seal device are in a dry friction state. The wear of the friction pair of the dynamic and static rings is aggravated, and the service life of the double mechanical seal device is greatly shortened

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