阅读说明：本技术 一种金属包覆的柔性石墨垫圈 (Metal-coated flexible graphite gasket ) 是由 许辉焱 刘欢 励行根 史志龙 南小飞 安华鹏 龚碧颖 于 2021-07-16 设计创作，主要内容包括：本发明属于贯穿件密封技术领域,尤其为一种金属包覆的柔性石墨垫圈,柔性石墨垫圈的上端面或/和下端面包覆有金属包覆板,所述金属包覆板与所述柔性石墨垫圈紧密贴合,且所述金属包覆板的两侧折弯后包裹住所述柔性石墨垫圈的部分侧壁。本发明通过设置与柔性石墨垫圈紧密结合的金属包覆板,可起到防止石墨材料从金属零件配合间隙中挤出(石墨材料流离)和减少石墨材料层间气体逸出的目的,从而提高了填料密封的可靠性和稳定性。在无其他装拆需求的情况下,免除了此处更换柔性石墨垫圈的维护需求,提高了设备运行和维护的经济性。(The invention belongs to the technical field of penetrating piece sealing, and particularly relates to a metal-coated flexible graphite gasket. The metal cladding plate tightly combined with the flexible graphite gasket is arranged, so that the purposes of preventing graphite materials from being extruded out of fit gaps of metal parts (graphite materials flow away) and reducing gas escape between graphite material layers can be achieved, and the reliability and the stability of packing sealing are improved. Under the condition of no other assembling and disassembling requirements, the maintenance requirement for replacing the flexible graphite gasket is eliminated, and the economical efficiency of equipment operation and maintenance is improved.)

1. A metal-clad flexible graphite gasket characterized by: the upper end face or/and the lower end face of the flexible graphite gasket (1) are/is covered with a metal cladding plate (2), the metal cladding plate (2) is tightly attached to the flexible graphite gasket (1), and the two sides of the metal cladding plate (2) are bent and then wrap part of the side wall of the flexible graphite gasket (1).

2. The metal-clad flexible graphite gasket as set forth in claim 1, wherein: the flexible graphite gasket (1) and the metal cladding plate (2) are both annular.

3. The metal-clad flexible graphite gasket as set forth in claim 1, wherein: the outer diameter and the inner diameter of the metal cladding plate (2) can cover the range of the outer diameter and the inner diameter of the flexible graphite gasket (1).

Technical Field

The invention relates to the technical field of penetration piece sealing, in particular to a metal-coated flexible graphite gasket.

Background

The Reactor Pressure Vessel (RPV) is an important device in a loop system of a pressurized water reactor nuclear power plant, is a pressure bearing sealing boundary and is mainly used for accommodating a reactor core, supporting and positioning reactor internals and sealing a loop coolant with high temperature and high pressure, a top cover of the reactor pressure vessel is a part of the RPV, a reactor measuring connecting pipe is arranged on the top cover, a core rod assembly penetrates through the reactor measuring connecting pipe and is discharged out, and a sealing ring cavity is formed at the terminal of the reactor measuring connecting pipe (an external pipe fitting) and the core rod assembly (an internal cylinder). One or more layers of flexible graphite gaskets can be placed in the ring cavity, and the gaskets are compressed through the compression sleeve, so that pressure boundary sealing of the sealing ring cavity is achieved. The prior art has the following problems: 1. interlayer gas in the graphite material is easy to escape under the action of pressure; 2. the graphite material is easily extruded from the fitting clearance of the metal parts under the action of pressure (graphite material flows away).

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides the metal-coated flexible graphite gasket, which reduces the pressurized escape of gas between graphite material layers and prevents the graphite material from flowing away.

In order to achieve the purpose, the invention provides the following technical scheme:

the metal-coated flexible graphite gasket is characterized in that the upper end face or/and the lower end face of the flexible graphite gasket is/are coated with a metal coating plate, the metal coating plate is tightly attached to the flexible graphite gasket, and the two sides of the metal coating plate are bent and then wrap part of the side wall of the flexible graphite gasket.

As a preferable technical solution of the present invention, the flexible graphite washer and the metal clad plate are both annular.

As a preferred embodiment of the present invention, the metal clad plate has an outer diameter and an inner diameter that cover the outer diameter and the inner diameter of the flexible graphite gasket.

Compared with the prior art, the invention provides a metal-coated flexible graphite gasket, which has the following beneficial effects:

1. through the metal cladding plate tightly combined with the flexible graphite gasket, the purposes of preventing graphite materials from being extruded out of fit gaps of metal parts (graphite materials flow away) and reducing gas escape between graphite material layers can be achieved, and therefore the sealing reliability and stability are improved. Under the condition of no other assembling and disassembling requirements, the maintenance requirement for replacing the flexible graphite gasket is eliminated, and the economical efficiency of equipment operation and maintenance is improved.

Drawings

FIG. 1 is a schematic structural view of a metal-clad flexible graphite gasket of the present invention;

fig. 2 is an enlarged schematic view of the structure at I in fig. 1.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Examples

Referring to fig. 1-2, in this embodiment: the metal-coated flexible graphite gasket is characterized in that the upper end face or/and the lower end face of a flexible graphite gasket 1 is/are coated with a metal coating plate 2, the metal coating plate 2 is tightly attached to the flexible graphite gasket 1, and the two sides of the metal coating plate 2 are bent and then wrap part of the side wall of the flexible graphite gasket 1.

In the invention, the metal cladding plate 2 with the bent inner and outer walls is tightly attached to the inner and outer walls and the end faces of the flexible graphite gasket 1, and the metal cladding plate 2 is symmetrically arranged by the central axis of the flexible graphite gasket 1, so that when the device is used, the metal cladding plate 2 can well realize the purposes of avoiding graphite material from flowing away and reducing gas escape between graphite material layers, thereby improving the reliability and stability of sealing. Under the condition of no other assembling and disassembling requirements, the maintenance requirement for replacing the flexible graphite gasket 1 is eliminated, and the economical efficiency of equipment operation and maintenance is improved.

In an embodiment of the present invention, the flexible graphite gasket 1 and the metal clad plate 2 are both ring-shaped. In some embodiments, the flexible graphite gasket 1 and the metal clad plate 2 may also be of a plate-like structure, a circular, oval structure, etc.

Alternatively, when one or more layers of the flexible graphite gasket 1 are placed in the seal ring cavity and the flexible graphite gasket 1 is compressed by the compression sleeve, the outer diameter and the inner diameter of the metal clad plate 2 can cover the range of the outer diameter and the inner diameter of the flexible graphite gasket 1. Therefore, the purposes of preventing the graphite material from being extruded out of the fit clearance of the metal cladding plate 2 (graphite material flow-off) and reducing the gas escape between graphite material layers can be achieved, and the sealing reliability and stability of the pressure boundary of the sealing ring cavity are improved.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that various changes, modifications and substitutions can be made without departing from the spirit and scope of the invention as defined by the appended claims. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.