Chamber type limit self-tightening type seal

Abstract

A box-type limited self-tight sealer belongs to a sealing device. A rectangular Y-shaped groove and a trapezoid gasket are arranged the a flange surface of a flange pair. The trapezoid gasket is positioned inside the rectangular Y-shaped groove of the flange. The sealer has the advantages that: 1. the sealer changes the shapes of the flange surface and a seal ring, changes the stress mode of the seal ring, and realize the position limitation while improving the sealing property; 2. one flange surface is provided with the rectangular Y-shaped groove and the other one is planar or curved; 3. the rectangular Y-shaped groove is processed by the conventional milling machine, or processed by welding a flat plate with a solder or by spot welding, so as to greatly reduce the difficulty and requirement for processing the flange surfaces; 4. the rectangular Y-shaped groove of the flange surface has large frictional force and ensures good limiting effect and easy installation; 5. the structure is simple, the operation is simplified, the cost is reduced and the sealing effect is improved; 6. the sealer has wider application range in size and pressure without the limitation of seal ring size; and 7. the sealer has simple structure, easy fabrication and small pre-tightening force of screws.

Description

technical field [0001] The patent of the present invention relates to a sealing device, especially a box-type position-limiting self-tightening seal. Background technique [0002] At present, the sealing forms commonly used in pressure vessels are divided into forced seals, semi-self-tightening seals and self-tightening seals according to the sealing methods: Among them: mandatory seals include: flat gasket seals, Kazali seals and octagonal gasket seals; semi-self-tightening seals include: : Double-cone seal; self-tightening seals include: wedge seal, combined seal that is Wood seal, hollow metal O-ring seal, C-ring seal, B-ring seal, triangular pad seal, octagonal pad seal and flat pad self-tightening seal. The various sealing devices mentioned above use forced, semi-self-tightening or self-tightening methods to seal the area to be sealed under the mutual extrusion of the contact surfaces of the flanges and through the deformation of the gasket. [0003] The following prob...

AI Technical Summary

Problems solved by technology

[0004] 1. When one side has a shallow groove and the other side is flat, it is extremely easy to cause difficulty in positioning the sealing ring, which reduces the reliability of the sealing of the box-type equipment in harsh environments and the convenience of operation

[0005] 2. In particular, triangular gaskets and combined seals (Wood seals) have problems such as complex structures, difficulty in designing box seals, high complexity in use, and poor operation convenience.

The sealing structure is complex, there are many parts, high requirements for assembly, and high processing precision requirements; application range: diameter D = 600 ~ 800mm, temperature t < 350 ° C, pressure p ≥ 30MPa

[0007] 3. In the harsh environments such as explosive environment, high temperature and low temperature, the self-limiting function and positioning function of the box-type sealing device are poor, and the pre-tightening pressure of the flange is required to be large.

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