Mechanical sealing device of high-speed high-pressure hydraulic pump

Abstract

The invention discloses a mechanical sealing device of a high-speed high-pressure hydraulic pump. The mechanical sealing device comprises a shell body, a rear cover and a transmission shaft; the innerside of the shell body is provided with an annular groove I, and a rubber sealing ring I is arranged in the annular groove I; the rear end of the shell body is provided with a counter bored hole I, the outer ring of a bearing is in interference fit with the counter bored hole I, and the inner ring of the bearing is interference fit with the transmission shaft; the front end of the rear cover is provided with a through hole II, the inner side of the through hole II is provided with an annular groove II, a rubber sealing ring II is arranged in the annular groove II, the rear end of the rear cover is provided with a counter bored hole II, and an elastic element is installed in the counter bored hole II; the rear end of a supporting frame is provided with a flange, and the front end surface of the flange is closely attached to the elastic element; a sealing ring is movably connected with the supporting frame, the front end surface of the sealing ring is closely attached to the rear end surface of the flange, and the rear end surface of the sealing ring is closely attached to the front end surface of the inner ring of the bearing. The elastic element is used for providing compensationelastic force, it is ensured that the supporting frame, the sealing ring and the bearing are closely attached, and the mechanical sealing device has the characteristics of being simple in structure, good in sealing performance, resistant to high rotation speed and vibration impact, high in reliability, long in service life and the like.

Description

technical field [0001] The invention relates to the technical field of mechanical hydraulics, in particular to a mechanical seal device of a high-speed and high-pressure hydraulic pump. Background technique [0002] In order to improve the power density of high-pressure hydraulic pumps, hydraulic pumps are gradually developing towards high speed and high pressure. However, high speed and high pressure have brought about sealing problems. Since the transmission shaft runs through the inside and outside of the hydraulic pump, there is a circumferential gap between the transmission shaft and the hydraulic pump casing, and the hydraulic oil inside the hydraulic pump will leak out through this gap, so a sealing device must be installed at the end of the transmission shaft to prevent leakage . Low-speed and low-pressure hydraulic pumps generally use rotary shaft lip seals. Since the seals are made of rubber, the allowable rotation speed and sealing specific pressure of the rotary...

AI Technical Summary

Problems solved by technology

Low-speed and low-pressure hydraulic pumps generally use rotary shaft lip seals. Since the seals are made of rubber, the allowable rotation speed and sealing specific pressure of the rotary shaft lip seals are low, and cannot be used for high-speed high-pressure hydraulic pumps.

Although the traditional mechanical seals used in gear boxes, centrifuges and other equipment can be used in hydraulic pumps, traditional mechanical seals are generally composed of moving rings, static rings, springs, auxiliary sealing rings and other parts, and have complex structures and vibration resistance. The problem of poor shock performance, especially for high-speed and high-pressure hydraulic pumps, due to the obvious vibration and shock caused by high speed and high pressure, if the high-speed and high-pressure hydraulic pump uses traditional mechanical seals, the reliability is poor, the life is short, and it is easy to oil spill

Images