CN218818139U

CN218818139U - Hollow sealing element, sealing flange and sealing structure of high-temperature gas cooled reactor

Info

Publication number: CN218818139U
Application number: CN202223604373.9U
Authority: CN
Inventors: 马志刚; 朱建强; 韩嘉兴
Original assignee: Suzhou Bmc Sealing Technology Co ltd
Current assignee: Suzhou Bmc Sealing Technology Co ltd
Priority date: 2022-12-30
Filing date: 2022-12-30
Publication date: 2023-04-07
Anticipated expiration: 2032-12-30

Abstract

The utility model belongs to the technical field of the sealing member and specifically relates to a seal structure that hollow seal spare, sealing flange and high temperature gas cooled piled is related to, and the sealing washer includes the ring body, is equipped with the cavity in the ring body, is equipped with the packing unit of increase cavity internal pressure in the cavity, and the ring body has first state and second state, and the cross-sectional area of ring body under first state is less than the cross-sectional area under the second state. The sealing flange comprises the hollow sealing element and at least two flange plates, one surface of one flange plate facing to the other flange plate is provided with a mounting groove, and the hollow sealing element is arranged in the mounting groove. The sealing structure of the high-temperature gas cooled reactor comprises the sealing flange and a plurality of carriers, wherein the sealing flange is arranged on the side wall of each carrier and is used for connecting the adjacent carriers. This application has the effect that delays the stress relaxation between the flange.

Description

Hollow sealing element, sealing flange and sealing structure of high-temperature gas cooled reactor

Technical Field

The application relates to the field of sealing elements, in particular to a sealing structure of a hollow sealing element, a sealing flange and a high-temperature gas cooled reactor.

Background

The sealing ring has various use modes in various industries, and in large-scale equipment with high requirements and long service life, such as a high-temperature gas cooled reactor, in order to prolong the service life of a container as much as possible and reduce the maintenance frequency, the metal sealing ring is adopted to seal flanges at the joints of an evaporator, a reactor and the like.

After the metal sealing ring is installed in the flange, after a long period of continuous use, such as ten years, twenty years and the like, the metal sealing ring has creep deformation, so that stress relaxation occurs between the flange and the sealing ring, namely, the connection between the flanges is relaxed. When the device needs to continuously and safely operate for forty years, such as a high-temperature gas cooled reactor, the design requirement is difficult to adapt.

SUMMERY OF THE UTILITY MODEL

In order to delay the stress relaxation between the flanges, the application provides a hollow sealing element, a sealing flange and a sealing structure of a high-temperature gas cooled reactor.

On the one hand, the application provides a hollow sealing member, adopts following technical scheme:

a hollow sealing element comprises a ring body, wherein a cavity is arranged in the ring body, a filling unit for increasing the pressure in the cavity is arranged in the cavity, the ring body has a first state and a second state, the first state is a normal temperature state, and the second state is a high temperature state;

after transitioning from the first state to the second state, the ring body is either unchanged in volume or expanded.

By adopting the technical scheme, after the filling unit is filled in the ring body, the volume of the filling unit is expanded in the second state, so that the pressure in the ring body is increased, a larger internal stress can be provided in the process of sealing the ring body, the sealing stress duration of the sealing element is prolonged, and the stress relaxation between the ring body and the flange plate is delayed.

The volume of the ring body can be greatly expanded in the second state through the filling unit, so that the ring body is further expanded, and the stress relaxation between the ring body and the flange is delayed through the expansion effect of the ring body and larger internal stress provided by the filling unit.

In a specific embodiment, the filling unit is a gas, and the volume of the ring body is unchanged when the ring body is in the second state.

Through adopting above-mentioned technical scheme, under high temperature environment, can promote the pressure of gas in the ring body by a wide margin, and then promote the sealing stress between ring body and the ring flange, further delay the stress relaxation between ring body and the flange.

In a specific possible embodiment, the packing element is carbon dioxide.

By adopting the technical scheme, the carbon dioxide is stable at normal temperature and high temperature, is easy to obtain, and can reduce the production cost of the sealing element.

In a particular embodiment, the filling unit has a coefficient of thermal expansion greater than that of the ring body, such that the ring body expands when the ring body is in the second state.

Through adopting above-mentioned technical scheme, utilize the material that thermal expansion coefficient is bigger to fill in the ring body for the ring body can further expand under high temperature state, promotes the barrier effect to the creep, further delays the stress relaxation between ring body and the ring flange.

In a specific possible embodiment, the filler element is silver oxide or mercury oxide.

By adopting the technical scheme, the silver oxide and the mercury oxide can decompose oxygen at high temperature, so that the pressure in the ring body is increased, the creep resistance effect of the ring body is improved, and the stress relaxation is further delayed.

In a specific embodiment, the outer wall of the ring body is provided with a sealing layer.

Through adopting above-mentioned technical scheme, the sealing layer seals the ring body, avoids appearing having the condition that the packing unit leaked on the ring body. The sealing layer seals a gap between the ring body and the flange, and improves the sealing performance between the ring body and the flange.

On the other hand, the application provides a sealing flange, adopts following technical scheme:

a sealing flange comprises the hollow sealing element and at least two flange plates, wherein one surface of one flange plate, which faces the other flange plate, is provided with a mounting groove, and the hollow sealing element is arranged in the mounting groove.

Through adopting above-mentioned technical scheme, hollow sealing member sets up in the mounting groove, relies on the expansion of hollow sealing member to promote the tight effect of supporting of hollow sealing member to the ring flange, blocks the creep of ring body, delays stress relaxation.

On the other hand, the application provides a sealing structure of a high-temperature gas cooled reactor, which adopts the following technical scheme:

the sealing structure of the high-temperature gas cooled reactor comprises the sealing flange and a plurality of carriers, wherein the sealing flange is arranged on the side wall of each carrier and is used for connecting the adjacent carriers.

By adopting the technical scheme, the gap of the carrier is sealed by utilizing the sealing flange, and the creep deformation is blocked by depending on the expansion abutting effect of the ring body, so that the stress relaxation is delayed, and the long-time continuous use of the carrier is facilitated.

In summary, the present application includes at least one of the following beneficial technical effects:

1. after the filling unit is filled in the pipe body, the ring body is expanded in the second state, the abutting effect of the ring body on the flange plate is improved, creep deformation of the pipe body is prevented, and stress relaxation between the ring body and the flange plate is delayed;

2. the volume that the packing element expanded under the second state is greater than the volume of ring body for the ring body can further increase, blocks creep, delays stress relaxation.

Drawings

Fig. 1 is a sectional view showing the structure of a hollow seal member in embodiment 1.

Fig. 2 is a partially enlarged schematic view of a portion a of fig. 1.

Fig. 3 is a sectional view showing a flange structure in embodiment 1.

Fig. 4 is a partially enlarged schematic view at B in fig. 3.

Fig. 5 is a schematic diagram of a sealing structure embodying a high temperature gas cooled reactor.

Fig. 6 is a sectional view of the flange structure in embodiment 2.

Fig. 7 is a partially enlarged schematic view at C in fig. 6.

Description of the reference numerals: 1. a ring body; 2. a cavity; 3. a sealing layer; 4. a flange plate; 5. mounting grooves; 6. a pressure vessel tank; 61. a tank body; 62. and (4) a tank cover.

Detailed Description

The present application is described in further detail below with reference to figures 1-7.

Example 1:

referring to fig. 1 and 2, embodiment 1 of the present application discloses a hollow sealing element, which includes a ring body 1, a cavity 2 is formed in the ring body 1, and a filling unit is arranged in the cavity 2. In this embodiment, the filling unit is specifically carbon dioxide, and the pressure of the carbon dioxide is greater than the standard atmospheric pressure. In some other embodiments, the gas may be a gas such as an inert gas, and the pressure inside the ring body 1 may be higher than the standard atmospheric pressure.

Referring to fig. 1 and 2, after a typical metal seal ring is installed in the flange 4, i.e., in a first state, as time increases, the seal ring undergoes creep, resulting in failure of the seal. In the application, the deformation of the ring body 1 is blocked by the aid of the large pressure of carbon dioxide, the creep speed is delayed, and the stress relaxation time is further delayed. In addition, when other gases are filled, the high temperature increases the pressure of the gases, but the ring body 1 is not necessarily deformed, and the expansion of the ring body 1 itself at the high temperature and the high pressure is constant according to the volume of the ring body 1, that is, the expansion with heat and contraction with cold of the ring body 1 itself is constant according to the volume.

Referring to fig. 1 and 2, and further, in some high temperature use environments, i.e., the second state, carbon dioxide has a greater coefficient of thermal expansion than the pipe body, such that carbon dioxide can further expand within the ring body 1, increasing the cross-sectional area of the ring body 1, and increasing the pressure within the ring body 1, further increasing the barrier effect against creep, further delaying the time for stress relaxation.

It should be noted that the thermal expansion coefficients mentioned above refer to the thermal expansion coefficient indicating the volume.

Referring to fig. 1 and 2, the outer wall of the ring body 1 is coated with a sealing layer 3, and the sealing layer 3 is specifically silver. Through setting up sealing layer 3, promote the sealed effect of ring body 1, avoid appearing the condition that the interior gas of ring body 1 leaked to protect ring body 1, promote ring body 1's stability and life. Meanwhile, the gap between the ring body 1 and the flange plate 4 can be sealed, and the sealing effect of the ring body 1 is improved.

Referring to fig. 3 and 4, embodiment 1 of the present application further discloses a sealing flange, which includes the above hollow sealing member and two flange plates 4, one flange plate 4 is provided with two annular mounting grooves 5, the mounting grooves 5 are spaced apart, and the depth of the mounting grooves 5 is slightly smaller than the diameter of the section of the ring body 1. After the ring body 1 is clamped in the mounting groove 5, the two flange plates 4 clamp the ring body 1 tightly, and clamping force is applied to the ring body 1.

Referring to fig. 5, in embodiment 1 of the present application, a sealing structure of a high temperature gas cooled reactor is further disclosed, which includes the above-mentioned sealing flange, and a carrier, in this embodiment, the carrier is a pressure vessel tank 6, which includes a tank body 61 and a tank cover 62, the flange 4 equipped with the ring body 1 is fixed on the outer wall of the tank body 61, the other flange 4 is fixed on the outer wall of the tank cover 62, after the tank cover 62 is covered on the tank body 61, the two flanges 4 are connected to seal the pressure vessel tank 6, and the joint is to be sealed by the sealing layer 3 of the ring body 1.

Example 2:

referring to fig. 6 and 7, embodiment 2 differs from embodiment 1 in that: the filling unit is silver oxide, and the air pressure in the ring body 1 is greater than or equal to the marked atmospheric pressure. In some other embodiments may be mercury oxide or the like, such that the substance is capable of generating or converting into a gas at high temperatures greater than or equal to 260 c, as desired by design.

Referring to fig. 6 and 7, in the first state, the contour of the cross section of the ring body 1 is an ellipse, and the silver oxide inside the ring body 1 is in a solid state. In the second state, the silver oxide in the ring body 1 decomposes at high temperature to generate oxygen, so that the pressure inside the ring body 1 increases, so that the ring body 1 expands, and the cross-sectional profile of the ring body 1 changes from an oval shape to a circular shape. When installing ring body 1 and flange 4, ring body 1 is under first state, makes things convenient for the installation of ring body 1 and flange 4, promotes the installation effectiveness. When the equipment with the flange operates, the ring body 1 is in the second state, the ring body 1 expands to improve the effect of blocking creep, and the stress relaxation time is delayed.

The above filling units are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereby, so: equivalent changes in structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. A hollow seal, characterized by: the ring body (1) is internally provided with a cavity (2), a filling unit for increasing the pressure in the cavity (2) is arranged in the cavity (2), the ring body (1) has a first state and a second state, the first state is a normal temperature state, and the second state is a high temperature state;

after transformation from the first state to the second state, the ring body (1) is either volume-invariant or expanded.

2. The hollow seal of claim 1, wherein: the filling unit is gas, and when the ring body (1) is in the second state, the volume of the ring body (1) is unchanged.

3. The hollow seal of claim 1 or 2, wherein: the filling unit is carbon dioxide.

4. The hollow seal of claim 1, wherein: the coefficient of thermal expansion of the filling unit is greater than that of the ring body (1), so that the ring body (1) expands when the ring body (1) is in the second state.

5. The hollow seal of claim 1 or 4, wherein: the filling unit is silver oxide or mercury oxide.

6. The hollow seal of claim 1, wherein: and a sealing layer (3) is arranged on the outer wall of the ring body (1).

7. A sealing flange, characterized in that: comprising a hollow sealing element according to any one of claims 1 to 6, and at least two flanges (4), one of said flanges (4) being provided with a mounting groove (5) on a side facing the other of said flanges (4), said hollow sealing element being arranged in said mounting groove (5).

8. A sealing structure of a high-temperature gas cooled reactor is characterized in that: comprising a sealing flange according to claim 7, and a number of carriers, said sealing flanges being arranged on the side walls of said carriers, connecting adjacent said carriers.