Dynamic sealing structure of main shaft of large high speed geotechnical centrifuge

Abstract

The invention discloses a dynamic sealing structure of a main shaft of a large high speed geotechnical centrifuge, which has strong adaptability, including a combined sealing form of a multi-channel labyrinth sealing structure, a one-channel spiral sealing structure and a one-channel stuffing sealing structure. The dynamic sealing structure of the main shaft of the large high speed geotechnical centrifuge can be applied to vacuum dynamic seal and achieve oil seal under atmospheric pressure, and has long service life. The stuffing seals with wear are opened on demand through a structure of a first screw, a compaction mechanism and a gland combination, and are used only in a limited period of time when a centrifuge chamber is pumped vacuum. The vacuum dynamic seal has strong reliability, andis provided with a compression mechanism with springs in design to ensure that after the stuffing is worn out, the gland can still press the stuffing. The replacement and switching operation of the compression mechanism is simple. Arc grooves and T-shaped grooves corresponding to the compression mechanism are respectively arranged on the gland and a static ring, thereby being convenient to replace the compression mechanism. The compression is designed with a limit sleeve to guarantee the same compression amount of the springs in each compression mechanism and further reduce the difficulty ofmanual operations.

Description

technical field [0001] The invention belongs to the technical field of geotechnical centrifuges, and in particular relates to a dynamic sealing structure for a main shaft of a large-scale high-speed geotechnical centrifuge. Background technique [0002] In the field of geotechnical engineering, the geotechnical centrifugal model test is to place the scaled geotechnical model (the size of each direction is 1 / n of the original soil) in a high-speed rotating geotechnical centrifuge, and use n times the acceleration of gravity (also known as ng ) to reproduce the stress state of the original soil (for related information, see: Jia Puzhao. Steady-state acceleration simulation experimental equipment-introduction and design of centrifuges [M]. Beijing: National Defense Industry Press, 2013). In recent years, the scale of geotechnical centrifuges has become larger and larger, and the centrifugal acceleration that can be achieved is also higher and higher. Large-scale, high-accelerat...

AI Technical Summary

Problems solved by technology

The difficulty of dynamic sealing of the main shaft of large-scale high-speed geotechnical centrifuges lies in: the diameter of the main shaft is too large, often exceeding 500mm, or even exceeding 1000mm; the maximum linear speed of the sealing part is high, often exceeding 20m / s, which makes many sealing methods unusable; due to the rotation of the support The quality of the parts is too large to allow frequent replacement of the seals, so the life expectancy of the seals is very high; it is necessary to realize the vacuum dynamic seal under short-term operation and the oil seal under normal pressure; the geotechnical centrifuge is a test equipment. Need to start and stop frequently

Because of the above difficulties, the use of traditional sealing products is limited, otherwise there will be poor sealing effect or short working life

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