Method for manufacturing and inspecting biconical metal sealing ring of nuclear reactor

Abstract

The invention belongs to the technical field of manufacturing and inspection of sealing elements, and particularly relates to a method for manufacturing and inspecting a biconical metal sealing ring of a nuclear reactor. The invention relates to a nuclear reactor biconical metal sealing ring manufacturing and inspection method, which comprises the following steps: S110: material preparation: preparing a plate material with a predetermined size; s120, turning the front end face; s130, reverse end face turning is carried out; s210, hardness, air tightness, water pressure and thermal cycle test detection is conducted on the manufactured double-cone type metal sealing ring; the performance of the double-cone type metal sealing ring can be effectively verified through evaluation standards of hardness, air tightness, water pressure and thermal cycle tests while the manufacturing process is improved, frequent replacement caused by the quality problem of the double-cone type metal sealing ring is avoided, and the production efficiency of a nuclear power plant is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of sealing component manufacturing and inspection, and in particular relates to a manufacturing and inspection method for a nuclear reactor double-cone metal sealing ring. Background Art

[0002] Thermocouple mechanical seals for nuclear reactor pressure vessels are important equipment in the main system of pressurized water reactor nuclear power units. They are the primary pressure boundary, and their main function is to maintain the integrity of the primary pressure boundary. During the operation of the nuclear reactor, the pressure vessel bears the effects of high temperature (≥310°C), high pressure (≥15.5MPa), and water flow impact of the primary boric acid water. Thermocouple mechanical seals mainly include: bowl-shaped metal seals, double-cone metal seals, male flanges, clamps and other mechanical parts. Among them, the double-cone metal seal faces high temperature, high pressure and large vibration conditions, which makes its sealing effect decay significantly, and it is difficult to meet the normal use requirements of the thermocouple mechanical seals for nuclear reactor pressure vessels. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a method for manufacturing and inspecting a double-cone metal sealing ring for a nuclear reactor in view of the above-mentioned deficiencies in the prior art. By improving the manufacturing process and strictly inspecting the defects of the finished product, the finished product can meet the working conditions.

[0004] In order to solve the above problems, the technical solution of the present invention is as follows: a method for manufacturing and inspecting a double-cone metal sealing ring for a nuclear reactor, the method comprising the following steps:

[0005] S110: material preparation, preparing sheets of predetermined size;

[0006] S120: positive end turning;

[0007] S121: Clamp one end of the sheet material using a clamp;

[0008] S122: Drilling the inner hole to a predetermined size;

[0009] S123: turning the outer diameter of the disc to a predetermined size;

[0010] S124: Turning the spherical surface to a predetermined size;

[0011] S130: reverse end turning;

[0012] S131: Clamp the disc using a clamp;

[0013] S132: Turn the spherical surface and the total length to the predetermined size;

[0014] S210: Conduct hardness, air tightness, water pressure and thermal cycle tests on the manufactured double cone metal sealing ring;

[0015] S211: Hardness test

[0016] Select a double cone metal seal ring for hardness test, refer to GB / T4340.1-2009 "Metallic Materials Vickers Hardness Test Part 1: Test Method" for the test; during the test, clamp the sample on the vise, make the axis of the indenter perpendicular to the sample surface, rotate the load selection hand wheel to HV0.01, and select a load of 0.098N; observe through the eyepiece, operate the cross workbench, select a suitable loading point, and then start the program to perform Vickers hardness test; use Vickers hardness HV1 as the evaluation basis, and HV1 ≥ 335 is considered qualified;

[0017] S212: Airtightness test

[0018] The airtightness test uses a double-cone metal sealing ring airtightness test tool and a double-cone metal sealing ring airtightness test device; the leakage rate of helium from the double-cone metal sealing ring is measured by a helium mass spectrometer leak detector; the leakage rate value is used as the evaluation basis, and a leakage rate ≤10-6Pa.m3 / s is considered to be qualified;

[0019] S213: Hydrostatic test

[0020] The water pressure test uses a double-cone metal seal ring water pressure test tool and a double-cone metal seal ring water pressure test system; the sealing condition of the double-cone metal seal ring is checked under a maximum water pressure of 25.8MPa, and it is considered qualified if there is no visible leakage and the pressure drop does not exceed 0.1MPa;

[0021] S214: Thermal Cycle Test

[0022] The thermal cycle test uses a double-cone metal sealing ring thermal cycle test fixture and a double-cone metal sealing ring thermal cycle test system; the test is carried out under hot conditions of temperature ≥310℃ and pressure ≥15.5MPa, and the test is repeated five times. No visible leakage is considered to be qualified.

[0023] The sheet material in step S110 is a disc of Φ110x22mm.

[0024] In step S121, the portion of the disc held by the clamp is 6 mm extending from one end to the other end.

[0025] The inner hole diameter of the drilling in step S122 is Φ77.8 mm.

[0026] In step S123, the outer diameter of the turning disc is Φ107.95 mm.

[0027] The outer diameter of the upper spherical surface is Φ84.3 mm to Φ84.4 mm, and the height of the upper spherical surface is 6.35 mm to 6.36 mm.

[0028] The sheet material comprises, by mass percentage, carbon: ≤0.07%, chromium: 15%-17.5%, nickel: 3-5%, silicon: ≤1%, manganese: ≤1%, sulfur: ≤0.03%, phosphorus: ≤0.04%, copper: 3%-5%, niobium: 0.15%-0.45%, and the rest of the material is iron.

[0029] The significant effect of the present invention is that the manufacturing and inspection method of a nuclear reactor double-cone metal sealing ring described in the present invention can effectively verify the performance of the double-cone metal sealing ring by improving the manufacturing process through the evaluation standards of hardness, airtightness, water pressure, and thermal cycle tests, thereby avoiding frequent replacement of the double-cone metal sealing ring due to quality problems and improving the production efficiency of nuclear power plants. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a schematic diagram of the process of manufacturing and inspecting a double-cone metal sealing ring for a nuclear reactor according to the present invention;

[0031] Figure 2 It is a schematic diagram of the structure of a double-cone metal sealing ring;

[0032] In the figure: 100, double cone metal sealing ring; 110, disk; 120, upper spherical surface; 130, lower spherical surface. DETAILED DESCRIPTION

[0033] The following will be combined with the accompanying drawings in the present invention to clearly and completely describe the technical solutions in the invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of the present invention.

[0034] In the description of the present invention, it should be noted that the directions or positional relationships indicated by “upper” and the like are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience and simplification of the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0035] In the description of the present invention, the terms “first” and “second” are used for descriptive purposes only and should not be understood as indicating or implying relative importance.

[0036] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connect", "set", "install", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0037] like Figure 2 As shown, the double-cone metal sealing ring 100 includes a disc 110, an upper spherical surface 120 and a lower spherical surface 130. The middle part of the double-cone metal sealing ring 100 is a cylindrical structure, the upper spherical surface 120 is provided at the left end, the lower spherical surface 130 is provided at the right end, and the disc 110 is provided at the right end of the lower spherical surface 130;

[0038] like Figure 1 As shown, a method for manufacturing and inspecting a double-cone metal sealing ring for a nuclear reactor comprises the following steps:

[0039] S110: material preparation, preparing sheets of predetermined size;

[0040] Preferably, the sheet material is a disc of Φ110x22mm;

[0041] The sheet material comprises, by mass percentage, carbon: ≤0.07%, chromium: 15%-17.5%, nickel: 3-5%, silicon: ≤1%, manganese: ≤1%, sulfur: ≤0.03%, phosphorus: ≤0.04%, copper: 3%-5%, niobium: 0.15%-0.45%, and the rest of the material is iron.

[0042] S120: positive end turning;

[0043] S121: Clamp one end of the sheet material using a clamp;

[0044] Preferably, the portion where the clamp holds the disc is 6 mm from one end to the other end;

[0045] S122: Drilling the inner hole to a predetermined size;

[0046] Preferably, the diameter of the drilled inner hole is Φ77.8 mm;

[0047] S123: turning the outer diameter of the disc 110 to a predetermined size;

[0048] Preferably, the outer diameter of the turning disc 110 is Φ107.95 mm;

[0049] S124: The upper spherical surface 120 is machined to a predetermined size, wherein the outer diameter of the upper spherical surface 120 is Φ84.3 mm to Φ84.4 mm, and the height of the upper spherical surface 120 is 6.35 mm to 6.36 mm;

[0050] S130: reverse end turning;

[0051] S131: Clamp the disc 110 using a clamp;

[0052] S132: The upper spherical surface 120 and the total length are adjusted to a predetermined size, wherein the outer diameter of the upper spherical surface 120 is Φ84.3 mm to Φ84.4 mm, and the height of the upper spherical surface 120 is 6.35 mm to 6.36 mm;

[0053] S210: Conduct hardness, air tightness, water pressure and thermal cycle tests on the manufactured double cone metal sealing ring

[0054] S211: Hardness test

[0055] Select a double cone metal seal ring for hardness test, refer to GB / T4340.1-2009 "Metallic Material Vickers Hardness Test Part 1: Test Method" for the test. During the test, clamp the sample on the vise, make the axis of the indenter perpendicular to the sample surface, rotate the load selection handwheel to HV0.01, and select the load 0.098N. Observe through the eyepiece, operate the cross workbench, select the appropriate loading point, and then start the program for Vickers hardness test. The Vickers hardness HV1 is used as the evaluation basis, and HV1 ≥ 335 is considered to be qualified.

[0056] S212: Airtightness test

[0057] The airtightness test uses a double cone metal seal ring airtightness test fixture and a double cone metal seal ring airtightness test device. The leakage rate of helium from the double cone metal seal ring is measured by a helium mass spectrometer leak detector. The leakage rate value is used as the evaluation basis, and the leakage rate ≤10 -6 Pa.m 3 / s is deemed to have passed the inspection.

[0058] S213: Hydrostatic test

[0059] The water pressure test uses a double cone metal seal ring water pressure test tool and a double cone metal seal ring water pressure test system. The sealing condition of the double cone metal seal ring is checked under a maximum water pressure of 25.8MPa. If there is no visible leakage and the pressure drop does not exceed 0.1MPa, it is considered to be qualified.

[0060] S214: Thermal Cycle Test

[0061] The thermal cycle test uses a double cone metal seal ring thermal cycle test fixture and a double cone metal seal ring thermal cycle test system. The test is carried out under hot working conditions of temperature ≥310℃ and pressure ≥15.5MPa, and the test is considered qualified if there is no visible leakage.

[0062] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. A method for manufacturing and inspecting a double-cone metal sealing ring for a nuclear reactor, characterized in that: The method comprises the following steps: S110: material preparation, preparing sheets of predetermined size; S120: positive end turning; S121: Clamp one end of the sheet material using a clamp; S122: Drilling the inner hole to a predetermined size; S123: turning the outer diameter of the disc (110) to a predetermined size; S124: turning the spherical surface (120) to a predetermined size; S130: reverse end turning; S131: Clamp the disc (110) using a clamp; S132: turning the spherical surface (120) and the total length to a predetermined size; S210: Conduct hardness, air tightness, water pressure and thermal cycle tests on the manufactured double cone metal sealing ring; S211: Hardness test Select a double cone metal seal ring for hardness test, refer to GB / T4340.1-2009 "Metallic Materials Vickers Hardness Test Part 1: Test Method" for the test; during the test, clamp the sample on the vise, make the axis of the indenter perpendicular to the sample surface, rotate the load selection hand wheel to HV0.01, and select a load of 0.098N; observe through the eyepiece, operate the cross workbench, select a suitable loading point, and then start the program to perform Vickers hardness test; use Vickers hardness HV1 as the evaluation basis, and HV1 ≥ 335 is considered qualified; S212: Airtightness test The airtightness test uses a double-cone metal sealing ring airtightness test tool and a double-cone metal sealing ring airtightness test device; the leakage rate of helium from the double-cone metal sealing ring is measured by a helium mass spectrometer leak detector; the leakage rate value is used as the evaluation basis, and the leakage rate ≤10 -6 Pa.m 3 / s is deemed to have passed the inspection; S213: Hydrostatic test The water pressure test uses a double-cone metal seal ring water pressure test tool and a double-cone metal seal ring water pressure test system; the sealing condition of the double-cone metal seal ring is checked under a maximum water pressure of 25.8MPa, and it is considered qualified if there is no visible leakage and the pressure drop does not exceed 0.1MPa; S214: Thermal Cycle Test The thermal cycle test uses a double-cone metal sealing ring thermal cycle test fixture and a double-cone metal sealing ring thermal cycle test system; the test is carried out under hot conditions of temperature ≥310℃ and pressure ≥15.5MPa, and the test is repeated five times. No visible leakage is considered to be qualified.

2. A method for manufacturing and inspecting a nuclear reactor double-cone metal sealing ring according to claim 1, characterized in that: The sheet material in step S110 is a disc of Φ110x22mm.

3. A method for manufacturing and inspecting a nuclear reactor double-cone metal sealing ring according to claim 1, characterized in that: In step S121, the portion of the disc held by the clamp is 6 mm extending from one end to the other end.

4. A method for manufacturing and inspecting a nuclear reactor double-cone metal sealing ring according to claim 1, characterized in that: The inner hole diameter of the drilling in step S122 is Φ77.8 mm.

5. The method for manufacturing and inspecting a nuclear reactor double-cone metal sealing ring according to claim 1, characterized in that: In step S123, the outer diameter of the turning disc (110) is Φ107.95 mm.

6. A method for manufacturing and inspecting a nuclear reactor double-cone metal sealing ring according to claim 1, characterized in that: The outer diameter of the upper spherical surface (120) is Φ84.3 mm to Φ84.4 mm, and the height of the upper spherical surface (120) is 6.35 mm to 6.36 mm.

7. A method for manufacturing and inspecting a double-cone metal sealing ring for a nuclear reactor according to claim 1, characterized in that: The sheet material comprises, by mass percentage, carbon: ≤0.07%, chromium: 15%-17.5%, nickel: 3-5%, silicon: ≤1%, manganese: ≤1%, sulfur: ≤0.03%, phosphorus: ≤0.04%, copper: 3%-5%, niobium: 0.15%-0.45%, and the rest of the material is iron.

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