Zirconium composite board container multi-layer welding joint leakage detection device

Abstract

The utility model discloses a leakage detection device for a multilayer welding joint of a zirconium composite board container, and belongs to the technical field of zirconium composite board welding. According to the leakage detection device for the multilayer welded joint of the zirconium composite plate container, the detection cover and the inspection window plate are matched to cover the detection section of the welded joint of the zirconium composite plate to be detected, the pressure in the detection cavity is increased through the vacuum pump, and a worker observes whether the welded joint coated with a foaming agent is blistered or not through the inspection window plate; if bubbling shows that the welding is not tight or the penetrability welding defect exists, and the corresponding sealing requirement is not met; the detection section is divided in an overlapped segmentation manner, so that the continuity and the reliability of detection are guaranteed; through cooperation of the vacuum pump and the vacuum pressure gauge, a worker can conveniently adjust the vacuum degree of the detection cavity, so that the detection cavity detects the welded joint of the to-be-detected zirconium composite board according to the specific vacuum degree; the defects of high detection cost and difficulty in positioning a leakage layer in the prior art are overcome.

Description

Technical Field

[0001] The utility model belongs to the technical field of zirconium composite plate welding, and in particular relates to a leakage detection device for a composite layer welding joint of a zirconium composite plate container. Background Art

[0002] Zirconium composite plate is a three-layer composite plate of zirconium-titanium-steel. Zirconium composite plate has excellent corrosion resistance, high strength and good processing performance. Due to its excellent performance, zirconium composite plate is widely used in the fields of new chemical materials, marine engineering and nuclear industry. It is mainly used to manufacture corrosion-resistant equipment, marine structures and fuel rod cladding of nuclear reactors.

[0003] Zirconium composite plate equipment is primarily used to contain highly corrosive working media. Therefore, the zirconium cladding has extremely stringent welding requirements. If a leak occurs in the weld of a zirconium composite plate with only one zirconium corrosion-resistant layer, the media will directly contact and corrode the pressure-bearing carbon steel. This not only endangers the safe operation of the equipment, but also makes it extremely difficult to simultaneously repair the zirconium steel that cannot be welded together. This often leads to equipment degradation, defective operation, or even scrapping, resulting in losses. Therefore, the welds of zirconium composite plates are leak tested, and only qualified zirconium composite plate equipment can be put into use.

[0004] Existing leak detection methods include X-ray testing, penetrant testing, and kerosene leakage weld detection. Penetrant testing is generally used to detect weld leaks in zirconium composite plates. Since zirconium composite plates are three-layer structures, X-ray testing is generally used to detect the weld conditions of zirconium composite plates. X-ray testing is not effective for thicker workpieces because the radiation attenuates significantly in thicker workpieces, making accurate detection difficult. In addition, the cost of using X-rays is also high. Kerosene leakage weld detection will contaminate the zirconium layer. Penetrant testing is difficult to effectively detect multi-layer composite plates because as long as one layer does not leak, the penetrant liquid cannot be detected on the other side. It is difficult to know whether there is a leaking layer in the composite plate and which layer is leaking. In other words, it is impossible to locate the specific layer of the composite plate that is leaking.

[0005] In summary, existing leakage detection methods have the disadvantages of high detection cost and difficulty in locating the leakage layer. Utility Model Content

[0006] The technical problem to be solved by the utility model is to provide a leakage detection device for composite welded joints of zirconium composite plate containers in view of the above-mentioned deficiencies in the prior art, which has a novel and reasonable design, a simple structure, a low cost and is convenient for leak location.

[0007] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0008] A device for detecting leakage of a composite welded joint of a zirconium composite plate container, comprising an inspection window plate, a hollow inspection cover, a vacuum pump, a vacuum pressure gauge, a pressure relief pipe, and a pressure relief valve;

[0009] The upper opening of the detection cover is tightly connected to the inspection window plate, and the lower opening of the detection cover is used to tightly connect to the surface of the zirconium composite plate to be inspected. The inspection window plate, the detection cover and the zirconium composite plate to be inspected constitute a detection cavity; the lower opening of the detection cover is used to cover the inspection section of the welded joint of the zirconium composite plate to be inspected;

[0010] Inspection window panels are used by workers to observe whether there is blistering at the weld joints where the blistering agent is applied;

[0011] The output end of the vacuum pump is connected to the interior of the detection cover through a vacuum pipe, and is used to extract the air in the detection cavity;

[0012] The detection end of the vacuum pressure gauge is arranged inside the detection cover and is used to measure the pressure inside the detection cover;

[0013] The pressure relief valve is connected to the pressure relief pipe, which is arranged on the side wall of the detection cover and is used to relieve pressure in the detection cavity;

[0014] The welded joint of the zirconium composite plate to be inspected is divided into inspection sections in an overlapping segmented manner, and the overlapping length of adjacent inspection sections is not less than 50 mm.

[0015] Furthermore, an annular groove is provided on the lower opening of the detection cover, and a vacuum sealing ring is embedded and connected in the annular groove.

[0016] Furthermore, a step surface is provided on the upper opening of the detection cover, and the inspection window plate is arranged on the step surface.

[0017] Furthermore, the weld joint refers to the weld of the zirconium composite plate to be tested and the heat-affected zone of the weld; the heat-affected zone of the weld refers to the area within a set length on both sides of the weld; the set length range is 15mm to 25mm.

[0018] Furthermore, O-shaped rubber sealing rings are provided at the connections between the vacuum pipe, the vacuum pressure gauge, the pressure relief pipe and the detection cover.

[0019] Furthermore, the vacuum pipe, vacuum pressure gauge and pressure relief pipe are arranged on the same side of the detection cover.

[0020] Furthermore, a rotatable handle is included, and blind holes are symmetrically opened on the sides of the detection cover, and the blind holes are used to connect the rotatable handle.

[0021] Furthermore, the inspection window panel adopts transparent glass.

[0022] Compared with the prior art, the present invention has the following advantages:

[0023] The zirconium composite plate container composite weld joint leakage detection device of the present application cooperates with the detection cover and the inspection window plate to cover the detection section of the weld joint of the zirconium composite plate to be detected, and increases the pressure in the detection cavity by a vacuum pump. The staff observes whether the weld joint coated with the foaming agent is bubbling by checking the window plate. If bubbling occurs, it means that the welding is not tight and does not meet the corresponding airtightness requirements; the detection section is divided into overlapping segments to ensure the continuity and reliability of the detection; the vacuum pump and the vacuum pressure gauge are used to facilitate the staff to adjust the vacuum degree of the detection cavity so that the detection cavity can detect the weld joint part of the zirconium composite plate to be detected according to a specific vacuum degree; in addition, since the welding order of each layer of the three-layer zirconium composite plate is usually to weld the steel layer first, and then perform X-ray inspection, after the steel layer welding joint is qualified, the titanium layer is welded first, and then the zirconium layer is welded. Therefore, one layer is welded and inspected, and the next layer is welded after the current welded layer meets the requirements, thereby ensuring the welding quality of the zirconium composite plate; at the same time, the welding of the three-layer zirconium composite plate is completed by the device, which solves the defects of the existing leak detection method with high detection cost and difficulty in locating the leaking layer.

[0024] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic diagram of the overall structure of an embodiment of a leakage detection device for a composite welded joint of a zirconium composite plate container of the present invention;

[0026] Figure 2 This is a top view of a detection cover of an embodiment of a leakage detection device for a composite welded joint of a zirconium composite plate container according to the present invention;

[0027] Figure 3 This is a bottom view schematic diagram of a detection cover of an embodiment of a leakage detection device for a composite welded joint of a zirconium composite plate container according to the present invention;

[0028] Figure 4 This is a cross-sectional schematic diagram of the detection cover of an embodiment of a leakage detection device for a composite welded joint of a zirconium composite plate container of the present invention;

[0029] Description of the accompanying drawings:

[0030] 1. Check window panel; 2. Check cover; 21. Step surface; 22. Vacuum sealing ring;

[0031] 3. Vacuum pump; 4. Vacuum pressure gauge; 5. Pressure relief pipe; 6. Pressure relief valve;

[0032] 7. Zirconium composite plate to be tested; 71. Steel layer; 72. Titanium layer; 73. Zirconium layer; 74. Welding seam; 75. Zirconium filler plate;

[0033] 8. Vacuum pipe; 9. O-ring rubber seal; 10. Rotatable handle. DETAILED DESCRIPTION

[0034] Zirconium composite plate container composite weld joint leakage detection device embodiment:

[0035] like Figure 1-4 As shown, the leakage detection device for the composite welded joint of the zirconium composite plate container includes an inspection window plate 1, a hollow detection cover 2, a vacuum pump 3, a vacuum pressure gauge 4, a pressure relief pipe 5 and a pressure relief valve 6.

[0036] Specifically, to ensure the airtightness of the detection cavity, the upper opening of the detection cover 2 is tightly connected to the inspection window 1, and the lower opening of the detection cover 2 is used to tightly connect to the surface of the zirconium composite plate 7 to be tested. The inspection window 1, detection cover 2, and zirconium composite plate 7 to be tested constitute the detection cavity; the lower opening of the detection cover 2 is used to cover the detection section of the welded joint of the zirconium composite plate 7 to be tested. To ensure the reliability of the detection, the welded joint of the zirconium composite plate 7 to be tested is divided into overlapping segments, that is, adjacent detection segments have a certain degree of overlap; if there is no overlap, leaks at the contact points of adjacent detection segments may be missed. When the detection cover 2 is placed over the detection section, the zirconium composite plate can be marked with a marking tool such as a pen or chalk, leaving corresponding substances. Since the application scenarios of zirconium composite plates have strict requirements, the residual markings can be cleaned after the test according to actual needs. Preferably, some light can be used to assist in locating the detection section to be tested, so that the additional cleaning step is not required.

[0037] The inspection window plate 1 is used by workers to observe whether bubbles are formed at the welding joints coated with the foaming agent. In order to ensure the observation effect of the inspection window plate 1, the inspection window plate 1 is made of transparent glass, such as high borosilicate glass.

[0038] To achieve adjustable vacuum levels within the detection chamber, the output of the vacuum pump 3 communicates with the interior of the detection hood 2 via a vacuum conduit 8, which is a flexible, corrugated vacuum hose. Furthermore, if the zirconium composite plate is difficult to move, the vacuum pump 3 can be fixed to the detection hood 2 to facilitate movement of the entire device. Alternatively, by lengthening the vacuum conduit 8, the movement of the vacuum pump 3 can be reduced, ensuring that the detection hood 2 can move freely within a certain range.

[0039] In order to obtain the vacuum degree in the detection cavity in real time, the detection end of the vacuum pressure gauge 4 is set inside the detection cover 2 to measure the pressure inside the detection cover 2.

[0040] In order to facilitate the adjustment of the pressure in the detection cavity, the pressure relief valve 6 is connected to the pressure relief pipe 5. The pressure relief pipe 5 is arranged on the side wall of the detection cover 2 for relieving the pressure of the detection cavity.

[0041] In order to further ensure that the vacuum degree of the detection cavity can be stably maintained, an annular groove is provided on the lower opening of the detection cover 2, and a vacuum sealing ring 22 is embedded in the annular groove; the vacuum sealing ring 22 is used to seal the detection cover 2 and the zirconium composite plate 7 to be detected.

[0042] In order to facilitate the connection between the inspection window plate 1 and the detection cover 2, a step surface 21 is provided on the upper opening of the detection cover 2, and the inspection window plate 1 is placed on the step surface 21. The inspection window plate 1 and the detection cover 2 can be connected by glue, and the glue can be UV glue, organic silicone, glass glue, structural glue, AB glue, etc. Preferably, the glue is organic silicone.

[0043] The weld joint refers to the weld 74 of the zirconium composite plate 7 to be tested and the heat-affected zone of the weld; the heat-affected zone of the weld refers to the area within a set length on both sides of the weld 74; the set length range is 15mm to 25mm. Figure 4 As shown, the zirconium composite plate has three layers, namely steel layer 71, titanium layer 72, and zirconium layer 73. When welding, the steel layer 71 is welded first, followed by the titanium layer 72, and finally the zirconium layer 71. When welding the titanium layer 72 and the zirconium layer 73, a zirconium filler plate 75 is used to fill the gap. Therefore, we inspect the zirconium composite plate by welding one layer at a time. The zirconium composite plate is inspected using this device. Only after passing the inspection can the next welding step be carried out. This completes the leakage detection of the zirconium composite plate and ensures the quality of the zirconium composite plate welding. In addition, since the steel layer 71 is thicker than the titanium layer 72 and the zirconium layer 73, in order to save time, we can use the existing X-ray detection method to inspect the steel layer 71, and use this device to inspect the titanium layer 72 and the zirconium layer 73. This is because: after the titanium layer 72 and the zirconium layer 73 are welded, if it is found that the steel layer 71 has a leakage defect, the difficulty and cost of repair will be very high.

[0044] In order to ensure the sealing of the detection cavity, the vacuum pipe 8, vacuum pressure gauge 4, pressure relief pipe 5 and the connection between the detection cover 2 are provided with O-rings 9. In this embodiment, the vacuum pipe 8, vacuum pressure gauge 4 and pressure relief pipe 5 are arranged on the corresponding two sides of the detection cover 2. In order to ensure the convenience of using the device, preferably, the vacuum pipe 8, vacuum pressure gauge 4 and pressure relief pipe 5 are arranged on the same side of the detection cover 2 to facilitate observation and operation by the staff. In this embodiment, the optimal solution of arranging the vacuum pipe 8, vacuum pressure gauge 4 and pressure relief pipe 5 on the same side of the detection cover 2 is not adopted.

[0045] In order to facilitate the staff to quickly move the detection cover 2 and shorten the detection time, a rotatable handle 10 is also included. Blind holes are symmetrically opened on the side of the detection cover 2, and the blind holes are used to connect the rotatable handle 10, thereby improving the efficiency of detection.

[0046] When the utility model is used, first, according to the size of the welding joint of the composite plate to be tested, a detection cover 2 of corresponding size is selected; then, a foaming agent is applied to the composite welding joint of the zirconium composite plate: when applying, the foaming agent is ensured to be uniform in thickness and evenly coated without missing any part of the coating, and there are no or very few bubbles; secondly, the detection is carried out according to the pre-divided detection sections, and the overlapping length of the detection sections is not less than 50mm; vacuum control and observation are carried out: observation should be made immediately when vacuuming is started; the detection vacuum degree is set reasonably, generally required to be -0.02MPa, -0.05MPa; the vacuum degree is maintained, generally required to be maintained at the above pressure for 10S and 30S respectively; if continuous bubbling leakage points are found, they should be marked and recorded.

[0047] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any simple modification, change and equivalent structural change made to the above embodiment based on the technical essence of the present invention shall still fall within the scope of protection of the technical solution of the present invention.

Claims

1. A device for detecting leakage of composite welded joints of zirconium composite plate containers, characterized by: It comprises an inspection window plate (1), a hollow inspection cover (2), a vacuum pump (3), a vacuum pressure gauge (4), a pressure relief pipe (5) and a pressure relief valve (6); The upper opening of the detection cover (2) is tightly connected to the inspection window plate (1), and the lower opening of the detection cover (2) is used to tightly connect to the surface of the zirconium composite plate (7) to be inspected. The inspection window plate (1), the detection cover (2) and the zirconium composite plate (7) to be inspected constitute a detection cavity; the lower opening of the detection cover (2) is used to cover the inspection section of the welded joint of the zirconium composite plate (7) to be inspected. The inspection window plate (1) is used by workers to observe whether the welding joints coated with the foaming agent are foamed; The output end of the vacuum pump (3) is connected to the interior of the detection cover (2) through a vacuum pipe (8) and is used to extract the air in the detection cavity; The detection end of the vacuum pressure gauge (4) is arranged inside the detection cover (2) and is used to measure the pressure inside the detection cover (2); The pressure relief valve (6) is connected to the pressure relief pipe (5), and the pressure relief pipe (5) is arranged on the side wall of the detection cover (2) and is used to relieve pressure in the detection cavity; The welded joint of the zirconium composite plate (7) to be tested is divided into test sections in an overlapping segmented manner, and the overlapping length of adjacent test sections is not less than 50 mm.

2. A device for detecting leakage of a composite welded joint of a zirconium composite plate container according to claim 1, characterized in that: An annular groove is provided on the lower opening of the detection cover (2), and a vacuum sealing ring (22) is embedded and connected in the annular groove.

3. A device for detecting leakage of a composite welded joint of a zirconium composite plate container according to claim 1, characterized in that: A step surface (21) is provided on the upper opening of the detection cover (2), and the inspection window plate (1) is arranged on the step surface (21).

4. A device for detecting leakage of a composite welded joint of a zirconium composite plate container according to claim 1, characterized in that: The weld joint refers to the weld (74) and the heat-affected zone of the zirconium composite plate (7) to be tested; the heat-affected zone of the weld (74) refers to the area within a set length on both sides of the weld (74); the set length ranges from 15 mm to 25 mm.

5. A device for detecting leakage of a composite welded joint of a zirconium composite plate container according to claim 1, characterized in that: The connection points between the vacuum pipe (8), the vacuum pressure gauge (4), the pressure relief pipe (5) and the detection cover (2) are all provided with O-shaped rubber sealing rings (9).

6. A device for detecting leakage of a composite welded joint of a zirconium composite plate container according to claim 1, characterized in that: The vacuum pipe (8), the vacuum pressure gauge (4), and the pressure relief pipe (5) are arranged on the same side of the detection cover (2).

7. A device for detecting leakage of a composite welded joint of a zirconium composite plate container according to claim 1, characterized in that: It also includes a rotatable handle (10), and blind holes are symmetrically opened on the sides of the detection cover (2), and the blind holes are used to connect the rotatable handle (10).

8. The device for detecting leakage of a composite welded joint of a zirconium composite plate container according to claim 1, characterized in that: The inspection window plate (1) is made of transparent glass.

Images