Metal sealing ring without pretightening force

Abstract

The invention discloses a pre-tightening-force-free metal sealing ring which comprises an outer supporting ring, an inner supporting ring and an elastic supporting piece, the inner supporting ring is installed in the outer supporting ring, and the elastic supporting piece is installed in the inner supporting ring; grooves are embedded in the upper end face and the lower end face of the outer supporting ring, sealing strips are installed in the grooves, and the sealing strips are metal strips. The invention belongs to the technical field of sealing rings, and particularly relates to a metal sealing ring without pretightening force.

Description

Technical Field

[0001] The invention belongs to the technical field of sealing rings, and in particular relates to a metal sealing ring without pre-tightening force. Background Art

[0002] In the development process of controlled nuclear fusion devices, the sealing technology between ceramic flanges and metals faces many severe challenges. Traditional sealing methods expose a series of problems when dealing with such special connections:

[0003] On the one hand, in some application scenarios, due to space limitations or special design requirements, it is impossible to use conventional bolts and metal clamps and other external force-assisted compression methods for sealing, which makes it urgent to find a reliable non-external force compression sealing method; on the other hand, the ceramic flange itself has the characteristic of being relatively thin, and conventional sealing methods are easy to damage it, further increasing the difficulty of sealing. In addition, in some occasions with extremely high vacuum requirements, such as the inside of a controlled nuclear fusion device, an extremely low leakage rate needs to be achieved, and traditional sealing products are difficult to meet this stringent standard;

[0004] At the same time, given the radiation environment inside the nuclear fusion device, ordinary sealing materials are prone to aging, resulting in a decrease in sealing performance, affecting the long-term stable operation of the device. Therefore, it is crucial to develop a sealing product that can meet the requirements of no preload, is suitable for special flanges such as ceramics, and has good radiation protection performance. Summary of the invention

[0005] In view of the above situation, in order to overcome the defects of the prior art, the present invention provides a metal sealing ring without pre-tightening force, which effectively solves the problems of high pre-tightening force requirement and poor sealing performance.

[0006] In order to achieve the above functions, the technical solution adopted by the present invention is as follows: a metal sealing ring without pre-tightening force, comprising an outer support ring, an inner support ring and an elastic support member, the inner support ring is installed in the outer support ring, and the elastic support member is installed in the inner support ring; grooves are embedded on the upper and lower end surfaces of the outer support ring, and a sealing strip is installed and fixed in the groove, and the sealing strip is a metal strip.

[0007] Preferably, the sealing strip is made of one of pure aluminum, pure silver, pure lead, pure tin or pure indium.

[0008] Preferably, the wire diameter of the sealing strip is 0.3-2.0 mm.

[0009] Preferably, the groove and the sealing strip are fixed by welding, bonding or hard extrusion.

[0010] Preferably, the outer support ring and the inner support ring are both C-shaped in longitudinal cross-section.

[0011] Preferably, the elastic support member is a helical closely packed metal spring, and the elastic support member is made of stainless steel.

[0012] The present invention adopts the above structure to achieve the following beneficial effects:

[0013] 1. The sealing ring can be pre-tightened only by the weight of the flange, without the need for additional bolts, metal clamps or other external forces to assist in tightening. This greatly simplifies the installation process, avoids the risk of damage to weak parts such as ceramic flanges due to improper external force, and also reduces installation costs and time costs.

[0014] 2. Through unique structural design and sealing material selection, the product leakage rate can be less than 110-11PaL / s, which meets the strict requirements of controlled nuclear fusion devices for high vacuum environment, effectively ensures the stable operation inside the device, and prevents safety hazards such as leakage of radioactive materials.

[0015] 3. The all-metal design is less susceptible to aging due to nuclear radiation than ordinary sealing materials. It can maintain stable sealing performance for a long time in the radiation environment of the nuclear fusion device, ensuring the long-term reliability and safety of the device.

[0016] 4. Since the sealing layer has extremely low hardness, it can adapt well to special flanges such as ceramics, glass, silicon carbide, etc. This feature enables the sealing ring to perform excellent sealing effects in connection sealing scenarios of a variety of different materials, broadening its application areas.

[0017] 5. There is a spring-type elastic support inside, which can not only provide support force to ensure that the sealing ring maintains a stable shape under different working conditions, but also provide compensation force through its own elastic deformation when there is a slight deformation or displacement on the sealing surface, further enhancing the reliability and stability of the seal. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The overall structure of a metal sealing ring without pre-tightening force proposed by the present invention is shown in FIG. Figure 1 ;

[0019] Figure 2 The overall structure of a metal sealing ring without pre-tightening force proposed by the present invention is shown in FIG. Figure 2 ;

[0020] Figure 3 The overall structure of a metal sealing ring without pre-tightening force proposed by the present invention is shown in FIG. Figure 3 ;

[0021] Figure 4 A cross-sectional view of a metal sealing ring without pre-tightening force proposed by the present invention;

[0022] Figure 5 for Figure 4 A partial enlarged view of point A in the middle.

[0023] Among them, 1. outer support ring, 2. inner support ring, 3. elastic support member, 4. groove, 5. sealing strip. DETAILED DESCRIPTION

[0024] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. The present invention is further described in detail below in conjunction with the accompanying drawings.

[0026] like Figure 1-5 As shown, a metal sealing ring without pre-tightening force proposed by the present invention comprises an outer supporting ring 1, an inner supporting ring 2 and an elastic supporting member 3, wherein the inner supporting ring 2 is installed in the outer supporting ring 1, and the longitudinal sections of the outer supporting ring 1 and the inner supporting ring 2 are both C-shaped, having good elasticity and stability, and the elastic supporting member 3 is installed in the inner supporting ring 2;

[0027] Grooves 4 are embedded on the upper and lower end surfaces of the outer support ring 1, and a sealing strip 5 is installed and fixed in the groove 4. The groove 4 and the sealing strip 5 are fixed by welding, bonding or hard extrusion, so that the sealing strip 5 is firmly connected to the groove 4 to ensure that it will not fall off during long-term use. The wire diameter of the sealing strip 5 is 0.3-2.0mm, and the sealing strip 5 is a metal strip. The material of the sealing strip 5 is one of pure aluminum, pure silver, pure lead, pure tin or pure indium. These soft metals have good flexibility and sealing properties, can fit tightly with the sealing surface, and effectively prevent gas leakage.

[0028] like Figure 5 As shown, the elastic support member 3 is a helical closely packed metal spring, and the elastic support member 3 is made of stainless steel, which provides a predetermined support stiffness and increases resilience.

[0029] When in use, the outer support ring 1 and the inner support ring 2 can enhance the overall structural strength of the sealing ring, making it less likely to deform when under pressure. The elastic support member 3 provides elastic support and compensation force for the sealing ring, ensuring that good sealing performance can be maintained under different working conditions. Soft metal sealing strips 5 are arranged above and below the sealing ring, which fit tightly with the sealing surface to effectively prevent gas leakage.

[0030] Before installation, ensure that the surfaces of the ceramic flange and the metal connection are clean, flat, free of impurities and oil, which helps to ensure the close fit between the sealing ring and the sealing surface and improve the sealing effect. Place the assembled non-preloaded metal sealing ring in the sealing position between the ceramic flange and the metal, ensure that the C-shaped opening direction of the sealing ring is correct, and that the soft metal strip is in full contact with the sealing surface;

[0031] During the vacuuming process, as the pressure decreases, the sealing ring gradually fits tightly between the ceramic flange and the metal under the support force of the elastic support member 3 and its own elasticity. At the same time, the sealing strip 5 deforms to a certain extent under the pressure, further filling the sealing gap to achieve an extremely low leakage rate.

[0032] Since the sealing ring adopts an all-metal design and has good radiation protection performance, it has a long service life and can meet the needs of long-term stable operation of controlled nuclear fusion devices.

[0033] The present invention and its embodiments are described above, and such description is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. In short, if ordinary technicians in the field are inspired by it, without departing from the purpose of the invention, they can design a structure and embodiment similar to the technical solution without creativity, which should belong to the protection scope of the present invention.

Claims

1. A metal sealing ring without preload force, comprising an outer support ring (1), an inner support ring (2) and an elastic support member (3), wherein the inner support ring (2) is installed in the outer support ring (1), and the elastic support member (3) is installed in the inner support ring (2); characterized in that: Grooves (4) are embedded on the upper and lower end surfaces of the outer support ring (1), and a sealing strip (5) is installed and fixed in the groove (4), and the sealing strip (5) is a metal strip.

2. A metal sealing ring without pre-tightening force according to claim 1, characterized in that: The sealing strip (5) is made of one of pure aluminum, pure silver, pure lead, pure tin or pure indium.

3. A metal sealing ring without pre-tightening force according to claim 2, characterized in that: The wire diameter of the sealing strip (5) is 0.3-2.0 mm.

4. The metal sealing ring without pre-tightening force according to claim 1, characterized in that: The groove (4) and the sealing strip (5) are fixed in one of the following ways: welding, bonding or hard extrusion.

5. The metal sealing ring without pre-tightening force according to claim 1, characterized in that: The outer support ring (1) and the inner support ring (2) both have C-shaped longitudinal cross-sections.

6. The metal sealing ring without pre-tightening force according to claim 1, characterized in that: The elastic support member (3) is a helical closely packed metal spring, and the elastic support member (3) is made of stainless steel.

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