A vacuum packaging method for large-diameter and small-section silver-plated sealing rings for high-temperature gas-cooled reactors

Abstract

The present invention discloses a method for vacuum packaging large-diameter, small-section silver-plated sealing rings for high-temperature gas-cooled reactors, comprising the following steps: wrapping a metal foil around the sealing ring along its circumference and connecting the two ends of the metal foil; folding the metal foil in half and placing a desiccant in the cavity formed by the metal foil; sealing the folded metal foil and reserving a vacuum tube access port; and wrapping the sealing ring with a stretch film after evacuation. The method of the present invention effectively reduces the degree and speed of oxidation of large-diameter, small-section silver-plated sealing rings for high-temperature gas-cooled reactors by wrapping the metal foil around the sealing ring and then evacuating the ring. This solves the technical problem that conventional packaging materials and packaging methods are unsuitable for sealing rings for high-temperature gas-cooled reactor pressure vessels and steam generators, reduces the degree of oxidation, and fills the gap in the lack of a basis for vacuum packaging of large-diameter, small-section sealing rings stored in nuclear power plants.

Description

Technical Field

[0001] The invention relates to the technical field of vacuum packaging of large-diameter and small-section silver-plated sealing rings for high-temperature gas-cooled reactors, and in particular to a vacuum packaging method of large-diameter and small-section silver-plated sealing rings for high-temperature gas-cooled reactors. Background Art

[0002] The sealing rings used in high-temperature gas-cooled reactor pressure vessels and steam generators have a diameter of about 4-6 meters. Due to their large diameter, small cross-sectional area, and silver-plated surface, ordinary packaging materials and standard packaging methods are not suitable. As a result, the sealing rings are easily oxidized during storage, reducing the sealing effect and being unfavorable for long-term storage.

[0003] The vacuum packaging method introduced in the present invention mainly wraps the sealing ring with aluminum foil and then evacuates the air, and regularly checks the vacuum state, thereby effectively reducing the oxidation degree and speed of the silver-plated sealing ring. Summary of the Invention

[0004] To address the technical issue of conventional packaging materials and methods being unsuitable for sealing rings used in high-temperature gas-cooled reactor pressure vessels and steam generators, the present invention proposes a method for vacuum packaging large-diameter, small-cross-section silver-plated sealing rings for high-temperature gas-cooled reactors. This method effectively reduces the degree and speed of oxidation in these rings by wrapping the rings with metal foil before vacuuming.

[0005] The present invention provides a method for vacuum packaging a large-caliber, small-section silver-plated sealing ring for a high-temperature gas-cooled reactor, comprising the following steps:

[0006] (1) Wrapping the sealing ring with metal foil along its circumference and connecting the two ends of the metal foil;

[0007] (2) folding the metal foil in half and placing a desiccant in the cavity formed by the metal foil;

[0008] (3) Seal the folded metal foil and reserve a vacuum tube access port;

[0009] (4) After vacuuming, wrap the sealing ring with a stretch film.

[0010] In some embodiments, the metal foil is aluminum foil.

[0011] In some embodiments, the metal foil has a thickness of 20-30 filaments.

[0012] In some embodiments, a deoxidizer is further placed in the cavity formed by the metal foil.

[0013] In some embodiments, the two ends of the metal foil are connected by using a sealing machine to connect the two ends of the metal foil to form a circular structure that matches the sealing ring.

[0014] In some embodiments, the sealer includes a temperature control system.

[0015] In some embodiments, a vacuum pump performs vacuuming through the vacuum tube access port.

[0016] In some embodiments, the vacuum pump is used to evacuate the air to a vacuum degree of less than 10 -4 Pa.

[0017] In some embodiments, the stretch film is a vapor phase anti-rust stretch film.

[0018] In some embodiments, the sealing ring has an anti-impact protective cover, and the metal foil is wrapped around the outside of the anti-impact protective cover.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The method of the present invention effectively reduces the oxidation degree and speed of large-diameter and small-section silver-plated sealing rings for high-temperature gas-cooled reactors by wrapping the sealing rings with metal foil and then evacuating the metal foil, thereby solving the technical problem that ordinary packaging materials and packaging methods are not suitable for sealing rings for high-temperature gas-cooled reactor pressure vessels and steam generators, reduces the oxidation degree, and fills the gap in the lack of basis for vacuum packaging of large-diameter and small-section sealing rings stored in nuclear power plants. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0022] Figure 1 This is a schematic flow chart of a method for vacuum packaging a large-diameter, small-section silver-plated sealing ring for a high-temperature gas-cooled reactor according to the present invention;

[0023] Figure 2 This is a schematic diagram of the vacuum packaging method of large-diameter and small-section silver-plated sealing rings for high-temperature gas-cooled reactors according to the present invention. DETAILED DESCRIPTION

[0024] The following describes embodiments of the present invention in detail, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and are not to be construed as limiting the present invention.

[0025] The following describes a vacuum packaging method for a large-diameter, small-section silver-plated sealing ring for a high-temperature gas-cooled reactor according to an embodiment of the present invention with reference to the accompanying drawings.

[0026] like Figure 1-2 As shown, the vacuum packaging method of the large-diameter and small-section silver-plated sealing ring for a high-temperature gas-cooled reactor of the present invention comprises the following steps:

[0027] S1: Use metal foil to wrap around the sealing ring along the circumference of the sealing ring and connect the two ends of the metal foil.

[0028] In some embodiments, the metal foil is aluminum foil. It is understandable that the metal foil can also be made of other suitable materials.

[0029] In some embodiments, the thickness of the metal foil is 20-30 filaments. It is also understood that the required width of the metal foil varies depending on the cross-sectional area of ​​the sealing ring. In actual operation, the appropriate width of the metal foil is selected based on the cross-sectional area of ​​the sealing ring. The length of the metal foil is specifically set based on the circumference of the sealing ring. It is understood that in order for the metal foil to properly wrap the sealing ring, the length of the metal foil should be slightly greater than the circumference of the sealing ring.

[0030] In some embodiments, the ends of the metal foil are connected by using a sealing machine to form a circular structure that matches the sealing ring. Specifically, the two ends of the metal foil are overlapped, and the sealing machine is used to seal the overlapping portion of the metal foil to connect the two ends of the metal foil to form a circular structure.

[0031] In some embodiments, the sealing machine includes a temperature control system, meaning the temperature of the sealing machine is adjustable. It is understood that, in actual operation, the temperature of the sealing machine is set based on actual conditions to achieve optimal sealing results. Furthermore, sealing results are determined by ensuring that the sealed joints are airtight after sealing.

[0032] In addition, the sealing ring itself has an anti-impact protective sleeve, and metal foil is wrapped around the outside of the anti-impact protective sleeve during the packaging process.

[0033] S2: Fold the metal foil in half and place the desiccant in the cavity formed by the metal foil.

[0034] Fold the foil in half to prepare for the subsequent sealing process. As you can see, the folded foil will create a cavity in the overlapping area. For ease of operation, add a desiccant before sealing. The desiccant is used to remove water vapor.

[0035] In some embodiments, a desiccant is placed in the cavity formed by the metal foil. The desiccant is used to remove oxygen to better prevent oxidation. It is understood that multiple packages of desiccant and desiccant can be placed.

[0036] S3: Seal the folded metal foil and leave a hole for the vacuum tube.

[0037] The folded metal foil is also sealed using a sealing machine. For the subsequent vacuuming operation, a vacuum tube access port is reserved when sealing the folded metal foil. The vacuum tube of the vacuum pump is inserted into the inner cavity of the metal foil through the reserved vacuum tube access port to perform the vacuuming operation.

[0038] In some embodiments, a vacuum pump is used to evacuate the air to a vacuum degree of less than 10 -4 Pa.

[0039] In order to facilitate the understanding of the steps of folding the metal foil in half to seal it, Figure 2 The diagram shows how to fold the metal foil in half and seal it.

[0040] S4: After vacuuming, wrap the sealing ring with stretch film.

[0041] In some embodiments, the stretch film is a vapor phase anti-rust stretch film. It is understood that the use of the vapor phase anti-rust stretch film can isolate the air and further protect the sealing ring.

[0042] In a specific embodiment, the sealing ring is equipped with an original plastic protective cover for anti-collision protection. The cross-sectional diameter of the sealing ring is 30mm, and the diameter of the sealing ring is 6m. Aluminum foil with a thickness of 24 wire and a width of 300mm is used to wrap around the sealing ring along the circumference of the sealing ring, and the two ends of the aluminum foil are connected with a sealing machine to form a circular structure that matches the sealing ring. The aluminum foil is folded in half to wrap the sealing ring, and a desiccant and a deoxidizer are added. The folded aluminum foil is sealed with a sealing machine, and a vacuum tube access port is reserved. A vacuum pump with a power of 1.1kw is used for vacuuming. Finally, a vapor phase anti-rust wrapping film is used to wrap around the outer periphery of the aluminum foil to isolate the air. In addition, during the storage process of the sealing ring, the sealing ring can be marked with a qualified label after packaging.

[0043] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms may be directed to different embodiments or examples. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are mutually inconsistent.

[0044] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0045] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the claims and their equivalents.

Claims

1. A method for vacuum packaging of large-caliber and small-section silver-plated sealing rings for high-temperature gas-cooled reactors, characterized in that: The following steps are involved: (1) Using metal foil to surround the sealing ring along the circumference direction of the sealing ring, and connecting the two ends of the metal foil, the two ends of the metal foil are connected by using a sealing machine to form a circular structure that matches the sealing ring, the sealing ring has an anti-collision protective cover, and the metal foil is wrapped around the outside of the anti-collision protective cover; (2) folding the metal foil in half and placing a desiccant in the cavity formed by the metal foil, and further placing a deoxidizer in the cavity formed by the metal foil; (3) Seal the folded metal foil and reserve a vacuum tube access port; (4) After vacuuming, the sealing ring is wrapped with a stretch film, wherein the stretch film is a vapor phase anti-rust stretch film.

2. The method according to claim 1, wherein The metal foil is aluminum foil.

3. The method according to claim 1, wherein The thickness of the metal foil is 20-30 filaments.

4. The method according to claim 1, wherein The sealing machine includes a temperature control system.

5. The method according to claim 1, wherein The vacuum pump performs vacuuming through the vacuum pipe access port.

6. The method according to claim 5, wherein The vacuum pump is used to evacuate the air to a vacuum degree lower than 10 -4 Pa.

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