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...

Examples

Embodiment 1

[0031] Embodiment one: if figure 1 , 5 As shown, the fastening screw is a countersunk screw 8 , and the bearing spring 5 is only sleeved on the cylinder 61 at the tail of the spring compression screw 6 .

Embodiment 2

[0032] Embodiment two: if figure 2 , 6 As shown, the fastening screw is a hexagon socket head screw 9 , and the upper end of the bearing spring 5 is sleeved on the cylinder 61 , and its lower end is sleeved on the cylinder head of the hexagon socket head screw 9 .

[0033] Such as Figure 8As shown, after the sealing of the stationary wheel 1 and the rotating wheel 2 is realized by this sealing device, the air flow will first pass through the straight-through grate sealing ring before flowing to the PTFE sealing ring 3, and first pass through several stages of straight-through grate The primary sealing function of the sealing ring reduces the pressure of the incoming flow; afterward, the air flow hits the outer surface of the PTFE sealing ring 3 and is divided into two paths: the right path is due to the PTFE sealing ring 3 and the rotating wheel 2 The tight fit of the sealing surface prevents the airflow from leaking here; the way to the left is due to the contact between ...

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...

Examples

Embodiment 1

[0031] Embodiment one: if figure 1 , 5 As shown, the fastening screw is a countersunk screw 8 , and the bearing spring 5 is only sleeved on the cylinder 61 at the tail of the spring compression screw 6 .

Embodiment 2

[0032] Embodiment two: if figure 2 , 6 As shown, the fastening screw is a hexagon socket head screw 9 , and the upper end of the bearing spring 5 is sleeved on the cylinder 61 , and its lower end is sleeved on the cylinder head of the hexagon socket head screw 9 .

[0033] Such as Figure 8As shown, after the sealing of the stationary wheel 1 and the rotating wheel 2 is realized by this sealing device, the air flow will first pass through the straight-through grate sealing ring before flowing to the PTFE sealing ring 3, and first pass through several stages of straight-through grate The primary sealing function of the sealing ring reduces the pressure of the incoming flow; afterward, the air flow hits the outer surface of the PTFE sealing ring 3 and is divided into two paths: the right path is due to the PTFE sealing ring 3 and the rotating wheel 2 The tight fit of the sealing surface prevents the airflow from leaking here; the way to the left is due to the contact between ...

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