Vane type high-temperature high-pressure gas (liquid) elastic dynamic sealing device and preparation method

Abstract

The invention discloses a vane type high-temperature high-pressure gas (liquid) elastic dynamic sealing device to further improve the sealing effect and prolong the service life. The dynamic sealing device comprises a base shell, an upper cover and a plurality of layers of sealing fins, wherein a lap of groove is formed in the integral inner side of the base shell and the upper cover; the arc shaped sections of every two adjacent sealing fin units of each layer of sealing fins in all layers of sealing fins are connected end to end to form an entire circle; the arc shaped sections and a shaft form radial elastic contact; the multiple layers of sealing fins are sequentially stacked at the entire circle; and the sealing fin units of every two adjacent layers of sealing fins are arranged in astaggered manner in the circumferential direction to cover port gaps between every two adjacent arc shaped sections, and the bending parts of all layers of sealing fins are correspondingly distributedat the port gaps. The vane type high-temperature high-pressure gas (liquid) elastic dynamic sealing device is better than labyrinth seal, honeycomb seal and brush seal in sealing effect, is lower than brush seal in manufacturing cost and technology difficulty and is higher than brush seal in product leakproofness and reliability.

Description

technical field [0001] The invention relates to a dynamic sealing device under high temperature and high pressure state. Background technique [0002] The dynamic seals for high temperature and high pressure gases mainly include soft and hard packing seals, labyrinth seals, piston ring seals and brush seals. The core of sealing is to reduce the leakage of sealing medium per unit time as much as possible under the same conditions. [0003] The soft packing is sealed under the appropriate packing and structure, the maximum applicable pressure is 35MPa, the temperature is 600°C, and the linear speed is 20m / s, which can meet the sealing requirements under general conditions. It is prone to packing hardening under open flame conditions, and the wear compensation is insufficient; The packing seal uses a pressure of 350MPa and a linear speed of 12m / s, which requires cooling or heating of the packing. [0004] The labyrinth seal forms a small tortuous gap between the rotating part...

AI Technical Summary

Problems solved by technology

[0005] The piston ring seal is a high-temperature and high-pressure gas sealing structure of the most commonly used engine and similar structures. It must work under continuous lubrication and cooling conditions, and has low adaptability to working conditions and is extremely easy to wear

[0006] As the key technology of modern turbomachinery, the brush seal has a contact surface of 120 pieces / mm 2 The metal wire group is grown on the forming substrate, the production is difficult, the cost is high, and the lubrication and cooling conditions are high

In addition, the brush seal has problems such as poor sealing, wire drop, and serious brushing of the shaft by the brush wire.

Images