Polytetrafluoroethylene contact type sealing device

Abstract

The invention discloses a polytetrafluoroethylene contact type sealing device. The polytetrafluoroethylene contact type sealing device comprises a static wheel disc which is arranged on the same central axis with a rotating wheel disc; a sealing groove which extends in the circumferential direction is formed in a sealing surface of the static wheel disc; a shape fixed steel ring and a polytetrafluoroethylene sealing ring are arranged in the sealing groove in sequence and are fixed through fastening screws; rotating stop screws and spring compression screws which are uniformly distributed along the sealing groove are arranged on the outer side surface of the static wheel disc; the shape fixed steel ring and the polytetrafluoroethylene sealing ring are fixed circumferentially through the rotating stop screws; force bearing springs are connected with the cylinders at the tail parts of the spring compression screws in a sleeving manner; the compression strength of the force bearing springs to the shape fixed steel ring is adjusted through the spring compression screws; a static wheel disc straight-through labyrinth sealing ring is arranged on the outer side of the sealing groove in the sealing surface of the static wheel disc and is adapted to a rotating wheel disc straight-through labyrinth sealing ring. The polytetrafluoroethylene contact type sealing device is simple in structure, convenient to mount and adjust and low in cost, can achieve a good sealing effect, meanwhile, has high sealing strength, and works reliably.

Description

technical field [0001] The invention relates to a polytetrafluoroethylene contact sealing device, which belongs to the test sealing technology of the rotary-static interface of an aero-engine and a gas turbine. Background technique [0002] With the improvement of aeroengine design technology and the development of experimental verification, the experimental research on the flow characteristics of rotating parts is becoming more and more extensive and in-depth. The disc is a very important and common component in aero-engines and gas turbines. The rotating disc cavity composed of adjacent stationary discs and rotating discs or the rotating disc cavity composed of adjacent rotating discs is the engine interior. An important part in the design and study of air systems. Regardless of whether it is a rotating-static disc cavity or a rotating disc cavity, the sealing problem of the rotating-static interface is involved in the test process of the model flow characteristics. [0...

AI Technical Summary

Problems solved by technology

However, there is always a gap between the stationary and rotating parts, which cannot keep the leakage at a very low level or achieve a completely leak-free level, which is not conducive to the study of flow characteristics

[0004] The existing contact seal is a graphite seal, which achieves the purpose of sealing through the contact friction between the graphite seal ring and the turntable, and the sealing effect is good. Vibration, knocking and impact are easy to break the graphite ring, affecting the sealing effect, and the graphite sealing ring is expensive

Another contact sealing device is the brush seal, which is similar to the graphite seal. The friction between the dense flexible metal brush wire and the turntable is used to achieve the purpose of sealing. However, the friction coefficient of the contact surface is high, and the frictional heat generated by the rotating wheel will Melt or break the metal brush wire. In the light case, it will affect the sealing performance. In severe cases, it will cause accidents that damage the high-precision testing equipment.

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