CN206439542U - A kind of novel flange sealing device - Google Patents

Abstract

A new type of flange sealing device, mainly composed of a lower flange, an upper flange, a gasket, studs and nuts, characterized in that both the lower flange and the upper flange are provided with a flat sealing surface and a conical sealing surface The gasket includes two parts: a flat sealing ring and a lens sealing ring; the studs and nuts apply pretightening force to the lower flange and the upper flange, and the lower flange and the upper flange compress the flat sealing ring of the gasket, At this time, the medium and low pressure medium can be sealed; when the pressure of the medium in the container increases, the lens sealing ring of the gasket is tightly attached to the conical sealing surface of the lower flange and the upper flange under the action of the pressure difference, thereby sealing the high pressure medium; The gasket is made of metal or non-metal material, which may be polytetrafluoroethylene. The utility model has the advantages of simple structure and convenient operation, and is suitable for media with different pressures.

Description

A New Flange Sealing Device

technical field

The utility model relates to a sealing device, in particular to a novel flange sealing device used for sealing medium-low pressure medium and high-pressure medium in a pressure vessel.

Background technique

In the oil and gas storage and transportation and petrochemical industries, the flange sealing device refers to a detachable connection consisting of flanges, gaskets and bolts connected to each other as a combined sealing structure. With the development of large-scale and integrated petrochemical equipment, the medium pressure in pipelines and other pressure vessels is constantly increasing, and the types of medium are becoming more and more complex, and the requirements for the performance of flange sealing devices are constantly increasing. In order to ensure the safe operation of the flange sealing device and prolong its life as much as possible, many scholars at home and abroad have carried out a lot of research work.

Flange sealing devices are widely used in petrochemical pressure vessels and pipelines. As the process conditions become more and more harsh, the production cycle requirements are getting longer and longer, and the leakage problem is obviously exposed. Whether the leakage problem is solved well or not is not only related to energy saving and environmental protection, but also related to the safety, stability and long-term production of the device. However, due to various reasons, people are still accustomed to using traditional sealing forms and materials or designing, manufacturing and selecting according to the original. In actual use, in order to solve the leakage problem, the flange connection is often downgraded, such as using a steel gasket under low pressure and normal temperature, or even welding the flange connection to death. This will inevitably lead to an increase in equipment maintenance costs and difficulties in the maintenance of containers and pipelines.

After research, it was found that one of the main reasons for the leakage of the flange sealing device is the unreasonable design. One of the main manifestations is that the design of the flange sealing structure is unreasonable, which makes the sealing structure unable to withstand large pressure fluctuations and leads to damage or leakage. leakage. Therefore, how to change the structure of the flange sealing device by means of design to meet the requirements of various complex working conditions has become the key to research.

Utility model content

The purpose of this utility model is: in order to overcome the leakage problem of the flange sealing device and reduce the manufacturing cost of the flange sealing device, a flange sealing device is specially proposed to realize the effective sealing of the flange to the medium under different working conditions.

In order to achieve the above purpose, the technical solution adopted by the utility model is: mainly composed of a lower flange, an upper flange, a gasket, studs and nuts, characterized in that: the lower flange and the upper flange are equipped with flat The sealing surface and the conical sealing surface; the gasket includes two parts: a plane sealing ring and a lens sealing ring; the studs and nuts apply pretightening force to the lower flange and the upper flange, and the lower flange and the upper flange are compressed and sealed The flat sealing ring of the gasket can seal the medium and low pressure medium at this time; when the medium pressure in the container increases, the lens sealing ring of the gasket is tightly attached to the conical sealing surface of the lower flange and the upper flange under the action of the pressure difference , so as to seal the high-pressure medium.

The novel flange sealing device is characterized in that the gasket is made of metal or non-metal material, such as polytetrafluoroethylene.

Compared with the prior art, the utility model has the following beneficial effects: (1) the device has a simple structure and is easy to operate; (2) it can realize effective sealing of different pressure media, and overcome the problem of the narrow use range of conventional flanges ; (3) The structure is not much different from the commonly used flange sealing device, which is helpful for equipment upgrading and worker operation.

Description of drawings

Fig. 1 is a structural schematic diagram of a new flange sealing device of the present invention.

Fig. 2 is a partially enlarged view of area A in Fig. 1 .

In the figure: 1. Lower flange, 2. Upper flange, 3. Gasket, 4. Stud, 5. Nut.

detailed description

As shown in Figures 1 and 2, a new type of flange sealing device is mainly composed of a lower flange 1, an upper flange 2, a gasket 3, a stud 4 and a nut 5, and is characterized in that: the lower flange 1 and the upper flange 2 are provided with a flat sealing surface and a conical sealing surface; the gasket 3 includes two parts of a flat sealing ring and a lens sealing ring; the stud 4 and the nut 5 are provided on the lower flange 1 and the upper flange 2 Apply preload, lower flange 1 and upper flange 2 compress the flat sealing ring of gasket 3, and at this time, medium and low pressure media can be sealed; when the medium pressure in the container increases, the gasket will The lens sealing ring of 3 is closely attached to the conical sealing surfaces of the lower flange 1 and the upper flange 2, thereby sealing the high-pressure medium.

The novel flange sealing device is characterized in that the gasket 3 is made of metal or non-metal material, such as polytetrafluoroethylene.

The novel flange sealing device is characterized in that: the lower flange 1 and the upper flange 2 can be integral flanges, loop flanges, flanges and the like.

The novel flange sealing device is characterized in that: the studs 4 and nuts 5 can be clamps, hoops and other fasteners.

Claims (2)

1. A new type of flange sealing device, mainly composed of lower flange (1), upper flange (2), gasket (3), stud (4) and nut (5), characterized in that: the Both the lower flange (1) and the upper flange (2) are provided with a flat sealing surface and a conical sealing surface; the gasket (3) includes two parts: a flat sealing ring and a lens sealing ring; the stud (4) and The nut (5) exerts pre-tightening force on the lower flange (1) and upper flange (2), and the lower flange (1) and upper flange (2) compress the flat sealing ring of the gasket (3). Seal medium and low pressure medium; when the medium pressure in the container rises, the lens sealing ring of the gasket (3) is tightly attached to the conical sealing surface of the lower flange (1) and the upper flange (2) under the action of the pressure difference , so as to seal the high-pressure medium. 2. A novel flange sealing device according to claim 1, characterized in that the gasket (3) is made of metal or non-metal material.