Sealing device

Abstract

The invention relates to a sealing device which can be automatically adjusted and compensated, mainly comprising a ring-shaped sealing element which is provided with a cavity and filled with a fluid medium, an external retaining ring and an internal retaining ring which are respectively sheathed on the internal ring and the external ring of the sealing element; under free state, the sealing element is subject to the action of the external retaining ring and the internal retaining ring, and the width of the sealing device is larger than the width of the two retaining rings; wherein, the external retaining ring and the internal retaining ring are elastic retaining rings; the ring-shaped sealing element is in square shape or other irregular ring shape; the shape of the elastic retaining ringis matched with the shape of the sealing element; the ring-shaped sealing element can be replaced by a long-shaped sealing element or two communicated chambers or an inflation sac which is connected on the sealing element, etc. The invention provides the sealing device which can ensure the uniform pressing sealing at all places of the sealing device, and can ensure good sealing effect by carryingout automatic compensation according to the relative position change of the part to be sealed to a certain extent.

Description

technical field [0001] The invention relates to a sealing device, in particular to a sealing device capable of automatic adjustment and compensation. Background technique [0002] Sealing between different parts is a very common situation in the industry, and sealing gaskets are widely used in pipelines and equipment. At present, the common gaskets are: 1) asbestos gaskets, 2) rubber gaskets, 3) graphite gaskets with metal coils, and so on. Gaskets are used in a wide range of applications, such as the gasket used between the water pump casing and the water pump pump seat, the gasket used between the gearbox casing and the gearbox seat, the two flanges in the pipeline, and so on. Such as figure 1 , figure 2 , image 3 As shown, it is applied to the application of the gasket placed between the two flanges when two sections of pipeline are connected. The gasket is placed between the two flanges, and the two flanges are fastened by bolts. in, figure 1 Indicates that after...

AI Technical Summary

Problems solved by technology

[0003] 1) It is difficult to ensure that the sealing pressure of the gasket is equal everywhere

When the gasket is installed, it is easy to cause uneven compression at different parts of the circumference

For example, for an 8-hole flange, when tightening different bolts separately, it is difficult to ensure that the force of each bolt is the same, so it is easy to cause one side of the gasket to be tight while the other side is loose, that is to say, the gasket The sealing pressing force of different parts on the circumference is not the same, which will cause leakage, such as figure 2 shown

[0004] 2) It is difficult to ensure the size of the gasket clamping force

There is a contradiction that is difficult to solve in traditional gaskets. When the clamping force between flanges is relatively small, it is difficult to ensure that the gasket is compressed, and the sealing effect will not be achieved. If the clamping force between flanges is large, It will severely deform the gasket, lose its elasticity, and leak.

And there is a certain degree of elasticity at the beginning of the gasket, but it loses its elasticity over time and cannot play a sealing role.

Many times the gasket seals well immediately after installation, but over time the gasket loosens and leaks

[0005] 3) It cannot automatically compensate for the relative position changes of the two sealed parts within a certain degree, and it is easy to leak

It cannot automatically adapt to the conditions of each sealed part due to vibration, settlement, pad expansion and contraction, etc., and it is difficult to ensure that the sealing is still good after these conditions occur

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