Post-welding sealing test tool for nuclear-grade helium medium ball valve metal sheet
By designing the post-weld sealing test tooling for the core-grade helium dielectric ball valve metal sheet, the combination of the right seal structure and the left seal structure is used to solve the problem of welding parameters and service life verification, and the curing of welding parameters and sealing performance verification is achieved. Ensure reliability and life inspection of welding parts.
Patent Information
- Application Number
- CN202310871900.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-07-17
- Publication Date
- 2025-01-17
AI Technical Summary
The welding process parameters of metal sheets in nuclear-grade helium dielectric ball valves cannot be cured, and their pressure bearing capacity cannot be verified, making it difficult to verify the welding parameters and service life.
A metal sheet post-weld sealing test tooling including right seal structure and left seal structure is designed. It is fixedly connected by bolts. The inner shoulder, annular groove, leak detection hole, step hole, O-ring and other structures ensure sealing and welding parts. test.
Effectively cure welding process parameters, verify the sealing performance of metal sheets and the service life of the welded parts, the structure is simple and easy to use.
Smart Images
Figure CN119321852A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to a post-welding sealing test tool for a nuclear-grade helium medium ball valve metal sheet, belongs to the field of nuclear power valves, and is used for verifying the post-welding sealing performance of a metal sheet. Background Art
[0002] The metal sheet is one of the important seals in the nuclear-grade helium isolation ball valve. The inner hole and outer circle of the sheet need to be welded to the valve seat and the cage respectively. Due to the structural characteristics of the metal sheet, the thickness is very thin, and its welding process parameters cannot be solidified and the pressure bearing capacity of the sheet cannot be verified. Therefore, it is necessary to solidify the welding process parameters on the test piece and verify the service life of the sheet and the welding part before welding on the valve seat and the cage. To solve this problem, a nuclear-grade helium medium ball valve metal sheet post-welding sealing test tool is invented. Summary of the invention
[0003] In view of the defects of the prior art, the present invention provides a post-welding sealing test tool for a nuclear-grade helium medium ball valve metal sheet.
[0004] The present invention is implemented as follows: a nuclear-grade helium medium ball valve metal sheet post-welding sealing test tool, which includes a right sealing structure and a left sealing structure, and the right sealing structure and the left sealing structure are fixedly connected by bolts.
[0005] For example, a nuclear-grade helium medium ball valve metal sheet post-weld sealing test fixture is described above, wherein an inner shoulder is provided on the end face of the right sealing structure facing the left sealing structure, and the inner shoulder is a groove with a certain depth, and the depth is the movement stroke of the metal sheet; two annular grooves are provided outside the inner shoulder, and the larger end face groove II is used to install the O-ring to ensure the sealing of the inner cavity of the test fixture; the smaller end face groove I prevents the protrusion of the welding part of the metal sheet from affecting the sealing of the test fixture, and a through hole is provided in the center of the right sealing structure, which is a leak detection hole to detect whether the test medium has leaked.
[0006] For example, in the above-mentioned nuclear-grade helium medium ball valve metal sheet post-weld sealing test tooling, the left sealing structure includes a core shaft, a left sealing plate, a baffle, and an extension tube.
[0007] For example, a nuclear-grade helium medium ball valve metal sheet post-weld sealing test tool as mentioned above, wherein the left sealing plate is provided with a stepped hole to cooperate with the core shaft and the metal sheet, the core shaft is arranged in the stepped hole, the metal sheet is a circular ring part, the outer circle of the metal sheet cooperates with the stepped hole of the left sealing plate, and the inner hole cooperates with the shoulder of the core shaft; due to space limitations, a stepped pressure inlet hole is provided on the side of the left sealing plate facing away from the right sealing structure, which is used for welding the pressure inlet interface extension pipe.
[0008] As mentioned above, a nuclear-grade helium medium ball valve metal sheet post-welding sealing test tool, wherein the core shaft is provided with an outer circular groove for installing an O-ring I and cooperating with the left sealing plate through hole to perform a sealing function, wherein the anti-blowout shoulder of the core shaft cooperates with the inner shoulder of the left sealing plate to prevent the metal sheet from being blown out after being subjected to the medium pressure.
[0009] For example, in the above-mentioned nuclear-grade helium medium ball valve metal sheet post-welding sealing test tool, the baffle is an annular structure to assist in safety protection, and a half-groove is provided on the end face to avoid the baffle assembly of the extension tube after welding.
[0010] The beneficial effects of the present invention are: a nuclear-grade helium medium ball valve metal sheet post-weld sealing test tool, through the right sealing structure and the left sealing structure of the tool, it is well solved that the metal sheet welding parameters cannot be solidified and the service life of the metal sheet and the welding part cannot be verified, and the structure is simple and easy to use. BRIEF DESCRIPTION OF THE DRAWINGS
[0011] Figure 1 It is a schematic diagram of a post-welding sealing test tooling for a nuclear-grade helium medium ball valve metal sheet according to the present invention;
[0012] Figure 2 It is a side view of a post-welding sealing test tool for a nuclear-grade helium medium ball valve metal sheet according to the present invention;
[0013] Figure 3 Schematic diagram of right seal structure;
[0014] Figure 4 Schematic diagram of the left cover;
[0015] Figure 5 Schematic diagram of the mandrel.
[0016] In the figure: 1- baffle; 2- O-ring I; 3- mandrel; 4- extension tube; 5- stud; 6- nut; 7- right sealing structure; 8- metal sheet; 9- O-ring II; 10- left sealing plate; 21- inner shoulder; 22- end face groove I; 23- end face groove II; 24- leak detection hole; 31- positioning inner shoulder; 32- positioning through hole; 33- pressure inlet hole; 41- outer circular groove; 42- positioning shoulder; 43- anti-blowout shoulder DETAILED DESCRIPTION
[0017] The present invention will be further described below in conjunction with the accompanying drawings and implementation examples.
[0018] The present invention provides a nuclear-grade helium medium ball valve metal sheet after welding sealing test tool, comprising: a stopper 1, an O-ring I2, a core shaft 3, an extension tube 4, a stud 5, a nut 6, a right sealing structure 7, a metal sheet 8, and an O-ring II9. Figure 1As shown, an O-ring I2 is installed on the outer circular groove 41 of the mandrel 3, and the mandrel 3 assembled with the O-ring I2 is installed in the positioning through hole 32 of the left sealing plate 10, and the anti-blowout shoulder 43 of the mandrel 3 cooperates with the positioning inner shoulder 31 of the left sealing plate 10. A metal sheet 8 is installed on the positioning shoulder 42 of the mandrel 3, and then the outer circle of the metal sheet 8 cooperates with the positioning inner shoulder 31 of the right sealing structure 7. The inner hole of the metal sheet 8 is firmly welded to the positioning shoulder 42 of the mandrel 3, and the outer circle of the metal sheet 8 is firmly welded to the positioning inner shoulder 31 of the left sealing plate 10. An extension tube 4 is welded to the pressure inlet hole 33 on the reverse end face of the left sealing plate 10. An O-ring II9 is installed on the end face groove II23 of the right sealing structure 7. The right sealing structure 7 is assembled with the welded left sealing plate 10, the mandrel 3 and the baffle 1 and fixed firmly with studs 5 and nuts 6.
[0019] The post-weld sealing test is carried out as follows: connect the pressure test pipe to the extension pipe 4, apply the required pressure to the pipeline, maintain the pressure for a certain period of time, and then check whether there is any leakage in the leak detection hole 24 of the right sealing structure 7. If there is no leakage of the test medium, it means that the welding process is reliable and the performance of the metal sheet 8 is qualified. After the leakage detection is completed, the pressure can be unloaded, and the pressure test process can be repeated to verify the life of the metal sheet 8 and the welding part.
Claims
1. A nuclear-grade helium medium ball valve metal sheet post-weld sealing test tool, characterized by: It comprises two parts, namely a right sealing structure (7) and a left sealing structure. The right sealing structure (7) and the left sealing structure are fixedly connected by bolts.
2. A nuclear-grade helium medium ball valve metal sheet post-weld sealing test tool as claimed in claim 1, characterized in that: An inner shoulder (21) is provided on the end face of the right sealing structure (7) facing the left sealing structure. The inner shoulder (21) is a groove with a certain depth, and the depth is the movement stroke of the metal sheet (8). Two annular grooves are provided outside the inner shoulder (21). The larger end face groove II (23) is used to install the O-ring (9) to ensure the sealing of the inner cavity of the test tool. The smaller end face groove I (22) prevents the protrusion of the welding part of the metal sheet (8) from affecting the sealing of the test tool. A through hole is provided in the center of the right sealing structure (7), which is a leak detection hole (24) to detect whether the test medium has leaked.
3. A nuclear-grade helium medium ball valve metal sheet post-weld sealing test tool as claimed in claim 2, characterized in that: The left sealing structure comprises a core shaft (3), a left sealing plate (10), a baffle (1), and an extension tube (4).
4. A nuclear-grade helium medium ball valve metal sheet post-weld sealing test tool as claimed in claim 3, characterized in that: The left sealing plate is provided with a stepped hole which cooperates with the core shaft and the metal sheet. The core shaft is arranged in the stepped hole. The metal sheet is a circular ring-shaped part. The outer circle of the metal sheet cooperates with the stepped hole of the left sealing plate, and the inner hole cooperates with the shoulder of the core shaft. Due to space limitations, a stepped pressure inlet hole is provided on the side of the left sealing plate which is back to the right sealing structure, which is used for welding the pressure inlet interface extension pipe.
5. A nuclear-grade helium medium ball valve metal sheet post-weld sealing test tool as claimed in claim 4, characterized in that: The core shaft (3) is provided with an outer circular groove (41) for mounting an O-ring I (2) and cooperating with the through hole of the left sealing plate to perform a sealing function, wherein the anti-blowout shoulder (43) of the core shaft (3) cooperates with the inner shoulder (21) of the left sealing plate to prevent the metal sheet (8) from being blown out after being subjected to the medium pressure.
6. A nuclear-grade helium medium ball valve metal sheet post-weld sealing test tool as claimed in claim 5, characterized in that: The baffle (1) is an annular structure, which assists in safety protection, and the end surface is provided with a semi-open groove, which is used to avoid the baffle being assembled by the extended pipe after welding.