Foaming method-vacuum cover test result reliability calibration device

Abstract

The utility model discloses a bubbling method-vacuum cover inspection result reliability calibration device, belongs to the technical field of welding, and provides a bubbling method-vacuum cover inspection system for calibrating vacuum leak detection welding seams, and the bubbling method-vacuum cover inspection system comprises a vacuum cover and a vacuum pump connected with the vacuum cover. The calibration device comprises a sensitivity artificial hole test plate and a breather pipe; the sensitivity artificial hole test plate is provided with a test hole penetrating through two side plate surfaces of the sensitivity artificial hole test plate; the vacuum cover is a special-shaped vacuum cover and can cover a welding seam detected by the foaming method-vacuum cover detection system, and a sealed space is formed by the vacuum cover and the surface of a workpiece where the welding seam is located. The vacuum cover covers the welding seam; the sensitivity artificial hole test plate is fixed in the vacuum cover, and the plate surface is parallel to the welding seam; one end of the breather pipe is connected with a test hole of the sensitivity artificial hole test plate, the other end extends out of the vacuum cover, and the test hole is communicated with the outside of the vacuum cover. The device provided by the utility model does not depend on a calibration test block bottom plate or manufacture a simulation piece, and is accurate and reliable in calibration result, strong in universality and convenient to use.

Description

Technical Field

[0001] The utility model belongs to the technical field of welding, and relates to a related device for sealing weld leakage inspection, in particular to a blistering method-vacuum cover inspection result reliability calibration device. Background Art

[0002] The nuclear island of "Hualong One" adopts a double-layer containment design, in which the containment steel lining structure and stainless steel pool have certain anti-leakage requirements, which is of great significance to the safe operation of nuclear power plants. It is a barrier to prevent the leakage of radioactive materials and has high requirements for sealing and anti-leakage performance.

[0003] According to the requirements of relevant technical standards for nuclear power construction, the sealing welds of steel linings and stainless steel pools need to be tested for leaks by the bubbling method-vacuum hood. The reliability of the bubbling method-vacuum hood test system needs to be calibrated and verified at the beginning and end of the leak test to ensure the reliability of the test results. However, the sensitivity calibration and verification of vacuum leak detection of welds with complex structures cannot be directly calibrated using the existing calibration process and sensitivity test blocks. It is necessary to make a special-shaped vacuum hood and then process and make a 1:1 simulation test block for sensitivity calibration. However, there are many special-shaped structures of welds in steel linings and stainless steel pools of nuclear power plants. Each special-shaped structure requires a separate simulation calibration test block, which has a large processing volume and a long cycle. The through-hole processing precision of the sensitivity test block is high, the cost is high, the versatility is not strong, the work efficiency is low, and the detection vacuum environment is inconsistent. The reliability of the detection needs to be improved. Once a missed detection occurs, there is a risk of nuclear leakage. Utility Model Content

[0004] The utility model provides a bubbling method-vacuum cover inspection result reliability calibration device to overcome the defects of the prior art.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A blistering method-vacuum hood inspection result reliability calibration device is used to calibrate the blistering method-vacuum hood inspection system for vacuum leak detection welds. The blistering method-vacuum hood inspection system includes a vacuum hood and a vacuum pump, a vacuum gauge and a stop valve connected to the vacuum hood. The calibration device includes a sensitivity artificial hole test plate and a vent pipe; the sensitivity artificial hole test plate has test holes that penetrate the plate surfaces on both sides thereof; the vacuum hood is a special-shaped vacuum hood that can be covered on the welds inspected by the blistering method-vacuum hood inspection system and form a sealed space with the workpiece surface where the welds are located; the vacuum hood covers the welds; the sensitivity artificial hole test plate is fixedly located in the vacuum hood, and the plate surface is parallel to the weld; one end of the vent pipe is connected to the test hole of the sensitivity artificial hole test plate, and the other end extends out of the vacuum hood, and the test hole communicates with the outside of the vacuum hood.

[0007] To optimize the above technical solutions, the specific measures taken also include:

[0008] Furthermore, the maximum diameter of the test hole of the sensitivity artificial hole test plate is 0.05 mm.

[0009] Furthermore, the ventilation pipe includes a right-angle pipe joint and a straight-through pipe; the right-angle pipe joint is a right-angled through-through pipe; the straight-through pipe is a straight-line through-through pipe; the upper end of the right-angle pipe joint is connected to the test hole of the sensitivity artificial hole test plate, and the other end is connected to one end of the straight-through pipe, and the other end of the straight-through pipe extends out of the vacuum cover.

[0010] Furthermore, the right-angle through-tube joint is threadedly connected to the test hole, and the straight-through pipe is threadedly connected to the right-angle through-tube joint.

[0011] Furthermore, the side wall of the vacuum cover is pressed on the straight-through pipe, and the straight-through pipe extends out of the vacuum cover from the bottom of the vacuum cover.

[0012] Furthermore, a sealing ring is provided at the bottom edge of the side wall of the vacuum cover; and a section of the straight pipe located under the side wall of the vacuum cover is wrapped with a sealing cushion.

[0013] Furthermore, the outer diameter of the straight pipe is less than 5 mm.

[0014] Furthermore, the right-angle pipe joint is fixed on the surface of the workpiece where the weld is located by a fixing piece.

[0015] Furthermore, the fixing member is a vacuum suction cup.

[0016] Furthermore, the sensitivity artificial hole test plate is square or circular.

[0017] The beneficial effects of the utility model are as follows: the utility model provides a blistering method-vacuum hood test result reliability calibration device, which is used for calibrating and verifying the reliability of the test results of the blistering method-vacuum hood test system, and can realize the calibration of the reliability of the test results directly on the weld workpiece. Specifically, when in use, the vacuum suction cup of the calibration device is adsorbed on the flat part of the surface of the weld workpiece, and the vacuum hood is covered on the sensitivity artificial hole test plate and the right-angle through pipe joint. The straight-through pipe is placed between the vacuum hood and the weld workpiece, and one end is placed on the outside of the vacuum hood, so that the test hole of the sensitivity artificial hole test plate is connected to the outside. By observing the display of the foaming agent at the test hole, the reliability of the sensitivity of the blistering method-vacuum hood test system can be quickly evaluated, and the calibration is accurate, so as to achieve a vacuum environment that is completely consistent with the actual test, and ensure the effectiveness and reliability of the test results. The calibration device has strong versatility and is suitable for various structural welds. For components with complex structures, it can avoid the production of simulation parts or additional additional tooling. In particular, the structural design is novel, compact, easy to operate and carry. When conducting vacuum box leakage detection in the workshop and installation site, it is possible to avoid carrying HWB type Ф0.05mm test block base or simulation test block, reducing the labor intensity of detection personnel and improving detection efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of a device for calibrating the reliability of the bubbling method-vacuum cover test results;

[0019] Figure 2 It is a structural schematic diagram of the sensitivity artificial hole test plate;

[0020] Figure 3 It is a structural schematic diagram of a right-angle pipe joint;

[0021] Figure 4 It is a schematic diagram of the structure of a straight-through pipe;

[0022] Figure 5 It is a top view of the working schematic diagram of the bubbling method-vacuum cover test result reliability calibration device;

[0023] Figure 6 It is a three-dimensional working schematic diagram of a bubbling method-vacuum cover test result reliability calibration device. DETAILED DESCRIPTION

[0024] The specific implementation of the present utility model is described below with reference to the accompanying drawings.

[0025] like Figures 1 to 4 As shown, the utility model provides a bubbling method-vacuum hood inspection result reliability calibration device, which is used to calibrate the bubbling method-vacuum hood inspection system of vacuum leak detection welds. The bubbling method-vacuum hood inspection system includes a vacuum hood and a vacuum pump, a vacuum gauge and an air stop valve connected to the vacuum hood, including a sensitivity artificial hole test plate 1 and a ventilation pipe 2.

[0026] The sensitivity artificial hole test plate 1 is a flat plate body, which is square or circular. The sensitivity artificial hole test plate 1 has a test hole 11 that runs through the plate surface on both sides thereof, and the maximum diameter of the test hole 11 is 0.05 mm. The vacuum cover is a special-shaped vacuum cover, which can be covered on the weld detected by the bubbling method-vacuum cover inspection system, and forms a sealed space with the workpiece surface where the weld is located. The vacuum cover covers the weld. The sensitivity artificial hole test plate 1 is fixedly located in the vacuum cover, and the plate surface is parallel to the weld, so as to ensure that the retention state and the force of the foaming agent remain consistent, so as to ensure the validity and reliability of the calibration results. The ventilation pipe 2 is a pipe fitting, one end of which is connected to the test hole 11 of the sensitivity artificial hole test plate 1, and the other end extends out of the vacuum cover, and the test hole 11 is communicated with the outside of the vacuum cover.

[0027] like Figure 1 , 3 As shown in Figure 4, specifically, the vent pipe 2 includes a right-angle through-tube joint 21 and a straight-through pipe 22. The right-angle through-tube joint 21 is a through-tube in a right angle shape. The straight-through pipe 22 is a through-tube in a straight line shape. The upper end of the right-angle through-tube joint 21 is connected to the test hole 11 of the sensitivity artificial hole test plate 1, and the other end is connected to one end of the straight-through pipe 22, and the other end of the straight-through pipe 22 extends out of the vacuum cover.

[0028] In a preferred embodiment, the right-angle through-tube joint 21 is threadedly connected to the test hole 11, and the straight-through pipe 22 is threadedly connected to the right-angle through-tube joint 21, which is convenient for disassembly and installation.

[0029] like Figure 5 and 6 As shown, the side wall of the vacuum cover A1 is pressed on the straight pipe 22, and the straight pipe 22 extends out of the vacuum cover from the bottom of the vacuum cover.

[0030] In a preferred embodiment, a sealing ring A11 is provided at the bottom edge of the side wall of the vacuum cover A1. Figure 1 and 4 As shown, a section of straight pipe 22 located under the side wall of the vacuum cover A1 is wrapped with a sealing cushion 23. During calibration, the side wall of the vacuum cover A1 is pressed on the section of straight pipe 22 wrapped with the sealing cushion 23, and under the action of the sealing ring A11 and the sealing cushion 23, the sealing of the space formed by the vacuum cover A1 and the workpiece surface is ensured.

[0031] The outer diameter of the straight pipe 22 is less than 5 mm.

[0032] The right-angle pipe joint 21 is fixed on the workpiece surface where the weld is located by a fixing member. In a specific embodiment, the fixing member is a vacuum suction cup 3. Of course, the right-angle pipe joint 21 can also be fixed on the weld rod by other fixing members or other fixing methods.

[0033] The working state of the reliability calibration device of the bubbling method-vacuum cover test result of the utility model is as follows Figure 5 and 6 As shown, the working method comprises the following steps:

[0034] Step 1: assemble the calibration device, that is, connect and assemble the sensitivity artificial hole test plate 1, the right-angle through-tube joint 21 and the straight-through pipe 22 into one body.

[0035] Step 2: Fix the calibration device on the workpiece surface where the weld A2 to be inspected by the blister method-vacuum cover inspection system is located through the vacuum suction cup 3, and keep the plate surface of the sensitivity artificial hole test plate 1 parallel to the weld.

[0036] Step 3: Assemble the bubbling method-vacuum cover inspection system, that is, connect the vacuum cover A1 with the vacuum pump A3, the vacuum gauge A4 and the air stop valve A5.

[0037] Step 4: Apply foaming agent to the test hole 11 of the sensitivity artificial hole test plate 1, then cover the weld A2, the sensitivity artificial hole test plate 1 and the right-angle through-pipe joint 21 with a vacuum cover A1, and place a section of straight-through pipe 22 wrapped with a sealing cushion 23 between the vacuum cover A1 and the workpiece surface, with the end of the straight-through pipe 22 located outside the vacuum cover A1.

[0038] Step 5: Start the vacuum pump A3 to reduce the pressure in the vacuum cover A1 so that the pressure difference with the surrounding air reaches the specified value (-0.01Mpa), and maintain the pressure for a certain period of time (10s). From the beginning of the vacuum environment and during the pressure maintenance period, timely observe whether there are continuous bubbles at the Ф0.05mm test hole 11 in the special-shaped vacuum cover A1.

[0039] Step 6: After the pressure holding time is reached, continue to reduce the pressure in the vacuum cover A1 until the pressure difference between the inside and outside reaches the specified value (-0.05Mpa), and hold the pressure for a certain time (30s). During this period, observe whether there are continuous bubbles at the 0.05mm test hole 11 in the vacuum cover A1.

[0040] That is, if continuous bubbles are generated, it means that the bubbling method-vacuum cover inspection system can detect at least 0.05mm through holes, and the sensitivity meets the requirements. If no bubbles are generated, it is necessary to check whether the test hole 11 of the sensitivity artificial hole test plate 1 is blocked, whether the air tightness of the bubbling method-vacuum cover inspection system is good, etc. After finding out the cause and correcting it, repeat the above test until the sensitivity requirements are met.

[0041] Compared with the existing methods, the calibration device is used to perform reliability calibration of the blister method-vacuum hood inspection system. It is only necessary to make a matching special-shaped vacuum hood, and there is no need to make a 1:1 simulation test block that is the same as the workpiece where the weld is located. That is, without the help of a calibration test block base plate or the production of simulation parts, the reliability calibration of the inspection result of the blister method-vacuum hood inspection system is directly performed on the inspected weld workpiece, thereby establishing a vacuum environment that is completely consistent with the actual inspection, thereby ensuring the absolute reliability of the inspection result.

[0042] It should be noted that the terms such as "upper", "lower", "left", "right", "front", "back", etc. used in the present invention are only for the convenience of description and are not intended to limit the scope of implementation of the present invention. Changes or adjustments to their relative relationships shall be deemed to be within the scope of implementation of the present invention without substantially changing the technical content.

[0043] Finally, it should be noted that the above are only preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions described in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A blistering method-vacuum hood inspection result reliability calibration device, used for calibrating a blistering method-vacuum hood inspection system for vacuum leak detection welds, the blistering method-vacuum hood inspection system comprising a vacuum hood and a vacuum pump connected to the vacuum hood, characterized in that: Includes sensitivity artificial hole test plate and ventilation tube; The sensitivity artificial hole test plate has test holes running through the two side surfaces thereof; The vacuum cover is a special-shaped vacuum cover, which can be covered on the weld to be inspected by the blister method-vacuum cover inspection system, and form a sealed space with the workpiece surface where the weld is located; The vacuum cover is placed on the weld; the sensitivity artificial hole test plate is fixed in the vacuum cover, and the plate surface is parallel to the weld; One end of the ventilation pipe is connected with the test hole of the sensitivity artificial hole test plate, and the other end extends out of the vacuum cover, and the test hole is communicated with the outside of the vacuum cover.

2. The device for calibrating the reliability of the bubbling method-vacuum cover test results according to claim 1, characterized in that: The maximum diameter of the test hole of the sensitivity artificial hole test plate is 0.05 mm.

3. The reliability calibration device for the bubbling method-vacuum cover test result according to claim 1, characterized in that: The vent pipe comprises a right-angle through-pipe joint and a straight through-pipe; The right-angle pipe joint is a through-pipe in a right-angle shape; The straight-through pipe is a straight-through pipe that penetrates the body; The upper end of the right-angle through-tube joint is connected to the test hole of the sensitivity artificial hole test plate, and the other end is connected to one end of the straight-through pipe, and the other end of the straight-through pipe extends out of the vacuum cover.

4. The device for calibrating the reliability of the bubbling method-vacuum cover test results according to claim 3, characterized in that: The right-angle through-tube joint is threadedly connected to the test hole, and the straight-through pipe is threadedly connected to the right-angle through-tube joint.

5. The device for calibrating the reliability of the bubbling method-vacuum cover test results according to claim 3, characterized in that: The side wall of the vacuum cover is pressed on the straight-through pipe, and the straight-through pipe extends out of the vacuum cover from the bottom of the vacuum cover.

6. The device for calibrating the reliability of the bubbling method-vacuum cover test results according to claim 5, characterized in that: A sealing ring is provided at the bottom edge of the side wall of the vacuum cover; A section of the straight-through pipe located under the side wall of the vacuum cover is wrapped with a sealing cushion.

7. The device for calibrating the reliability of the bubbling method-vacuum cover test results according to claim 6, characterized in that: The outer diameter of the straight-through pipe is less than 5 mm.

8. The device for calibrating the reliability of the bubbling method-vacuum cover test results according to claim 3, characterized in that: The right-angle through-tube joint is fixed on the surface of the workpiece where the welding seam is located through a fixing piece.

9. The device for calibrating the reliability of the bubbling method-vacuum cover test results according to claim 8, characterized in that: The fixing member is a vacuum suction cup.

10. The device for calibrating the reliability of the bubbling method-vacuum cover test results according to claim 1, characterized in that: The sensitivity artificial hole test plate is square or circular.

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