Inner hole welding gas leakage detection tool

Abstract

The utility model discloses an inner hole welding gas leakage detection tool, which comprises a rod body, a first sealing unit, a second sealing unit and a gas inlet hole, and is characterized in that the rod body is provided with a gas connecting end; the first sealing unit and the second sealing unit are arranged at the two ends of the rod body respectively, the first sealing unit is used for sealing one side of an inner hole welding seam, and the second sealing unit is used for sealing the other side of the inner hole welding seam; one end of the air inlet is arranged at the air connecting end of the rod body, and the other end of the air inlet is arranged on the rod body face of the rod body and between the first sealing unit and the second sealing unit. The inner hole welding gas leakage detection tool is simple and convenient to operate, can timely and accurately detect the welding seam quality of inner hole welding, effectively makes up for the deficiency of means that the welding seam quality cannot be immediately detected after welding, facilitates real-time adjustment of welding parameters, and reduces or avoids the generation of welding seam defects.

Description

Technical Field

[0001] The utility model relates to the technical field of weld detection, in particular to an inner hole welding gas leak detection tool. Background Art

[0002] As one of the important devices in the ethylene cracking process, the dilution steam superheater usually adopts the inner hole butt welding between the tube sheet and the heat exchange tube at the material inlet end. This structure is mainly used in high temperature, high pressure and corrosive medium conditions. Compared with the traditional extended tube head welding, it has the following advantages:

[0003] 1. The reliability of welding joints is relatively high;

[0004] 2. The heat exchange tube and tube sheet are fully welded, no gap corrosion occurs, and the stress corrosion resistance is good;

[0005] 3. No residual stress is generated due to pipe expansion, and there is no stress concentration at the root of the weld at the end weld joint, so cracks are not likely to occur during operation.

[0006] However, the inner hole welding of the pipe head of this structure cannot be self-checked for leakage immediately after welding. It is necessary to wait until 100% RT inspection to determine whether the pipe head has defects. The whole process is time-consuming and seriously affects the production progress. Utility Model Content

[0007] The utility model aims to provide an inner hole welding gas leak detection tool, which can timely detect the gas tightness of the weld after the inner hole welding of the pipe head is completed (helium leak detection test), effectively making up for the lack of means for immediately detecting the weld quality after welding.

[0008] The purpose of the utility model is achieved by the following technical solutions:

[0009] An inner hole welding gas leak detection tool, comprising:

[0010] A rod body, wherein the rod body is provided with a gas connection end;

[0011] A first sealing unit and a second sealing unit are respectively arranged at two ends of the rod body, wherein the first sealing unit is used to seal one side of the inner hole weld, and the second sealing unit is used to seal the other side of the inner hole weld;

[0012] An air inlet hole, one end of which is arranged at the air receiving end of the rod body, and the other end of which is arranged on the rod body surface of the rod body and between the first sealing unit and the second sealing unit.

[0013] In some embodiments, the rod body is provided with a first mounting groove and a second mounting groove respectively;

[0014] The first sealing unit is disposed in the first mounting groove, and the second sealing unit is disposed in the second mounting groove.

[0015] In some embodiments, the first mounting groove and the second mounting groove are formed by depressions on the shaft surface of the rod body.

[0016] In some embodiments, a step end is provided at one end of the rod body away from the gas receiving end, and a support sleeve and a top sleeve are respectively provided on the rod body;

[0017] One end of the support sleeve cooperates with the step end of the rod body to form the first installation groove;

[0018] The other end of the support sleeve cooperates with the top sleeve to form the second installation groove.

[0019] In some embodiments, the support sleeve is loosely matched with the rod body, and a through hole communicating with the air inlet hole is disposed on the outer peripheral surface of the support sleeve.

[0020] In some embodiments, a nut is provided on a side of the top sleeve away from the support sleeve, and the nut is threadedly connected to the air connecting end of the rod body.

[0021] In some embodiments, the first sealing unit includes at least one first sealing ring.

[0022] In some embodiments, the first sealing unit further includes a first gasket, and the first gasket is used to clamp and / or separate the first sealing ring.

[0023] In some embodiments, the second sealing unit includes at least one second sealing ring.

[0024] In some embodiments, the second sealing unit includes a second gasket, and the second gasket is used to clamp and / or separate the second sealing ring.

[0025] Compared with the prior art, the beneficial effects of the utility model include at least: the tooling is simple and convenient to operate, can timely and accurately detect the weld quality of the inner hole weld, effectively makes up for the lack of means to immediately detect the weld quality after welding, facilitates real-time adjustment of welding parameters, and reduces or avoids the occurrence of weld defects. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of the inner hole welding gas leak detection tooling of Example 1.

[0027] Figure 2 Schematic diagram of the structure of the rod body in Example 1.

[0028] Figure 3 It is a structural schematic diagram of the inner hole welding gas leak detection tooling of Example 2.

[0029] Figure 4 It is a schematic structural diagram of the rod body in Example 2.

[0030] Figure 5 It is a schematic structural diagram of the first sealing unit.

[0031] Figure 6 It is a schematic structural diagram of the second sealing unit.

[0032] Figure 7 It is a schematic diagram of the use of the inner hole welding gas leak detection tool.

[0033] In the figure: 1, rod body; 101, gas connecting end; 102, step end; 2, first sealing unit; 201, first sealing ring; 202, first gasket; 3, second sealing unit; 301, second sealing ring; 302, second gasket; 4, air inlet; 5, first mounting groove; 6, second mounting groove; 7, support sleeve; 701, through hole; 8, top sleeve; 9, nut; 10, tube sheet; 11, heat exchange tube. DETAILED DESCRIPTION

[0034] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided to make the present invention more comprehensive and complete and to fully convey the concepts of example embodiments to those skilled in the art. The same reference numerals in the figures represent the same or similar structures, and thus their repeated description will be omitted.

[0035] The words expressing positions and directions described in the present utility model are all explained by taking the drawings as examples, but they can be changed as needed, and all the changes are included in the protection scope of the present utility model.

[0036] The utility model discloses an inner hole welding gas leak detection tool, which is mainly used for helium leak detection test at the inner hole welding seam of a pipe head, and can also be used for other working conditions requiring air tightness detection.

[0037] See also Figure 1 and Figure 3 As shown, the inner hole welding gas leak detection tool includes a rod body 1, a first sealing unit 2, a second sealing unit 3 and an air inlet 4.

[0038] See Figure 2 and Figure 4 The rod body 1 is generally a columnar structure, and its rod diameter is adapted to the diameter of the tube sheet 10 and the heat exchange tube 11 to be tested, so as to facilitate assembly testing. The length of the rod body 1 is usually determined by the weld depth of the inner hole weld, and it is sufficient to ensure that the length of the rod body 1 exceeds the weld depth of the inner hole weld.

[0039] The rod body 1 is provided with a gas connection end 101 for connecting a gas source, such as a low-pressure helium source. In addition, the rod body 1 is provided with an air inlet 4, one end of which is provided at the gas connection end 101 of the rod body 1, and the other end is provided at the rod body surface of the rod body 1, so as to guide the helium at the gas connection end 101 to the weld of the inner hole welding.

[0040] See Figure 1 and Figure 3 The first sealing unit 2 and the second sealing unit 3 are respectively arranged at the two ends of the rod body 1, wherein the first sealing unit 2 is used to seal one side of the inner hole weld, and the second sealing unit 3 is used to seal the other side of the inner hole weld, and the air inlet 4 is located at one end of the rod body surface between the first sealing unit 2 and the second sealing unit 3, thereby forming a closed space around the inner hole weld, and a helium leak detection test can be achieved with the injected helium.

[0041] See also Figure 7 As shown in the figure, when the inner hole welding gas leak detection tool of the present application is used, the rod body 1 is first inserted into the tube sheet 10 and the heat exchange tube 11, so that the first sealing unit 2 and the second sealing unit 3 respectively seal the two sides of the inner hole welding seam. After the tool is in place, the gas source is connected to the gas connection end 101, and gas (such as helium) is injected into the weld of the inner hole welding through the gas inlet 4, and the pressure is increased to 0.103MPa and maintained. After maintaining the pressure for 30 minutes, a high-sensitivity helium mass spectrometer is used to detect the outside of the weld of the inner hole welding. When the leakage rate does not exceed 1×10 -7 Pa·m 3 / s is acceptable.

[0042] It should be noted that the above detection is a single tool detection mode. During the actual detection process, the gas connection ends 101 of multiple tools can be connected in series through pipes to achieve simultaneous detection of multiple welds and speed up detection efficiency.

[0043] See also Figures 1 to 4 As shown, in some embodiments, to facilitate the installation of the first sealing unit 2 and the second sealing unit 3, a first mounting groove 5 and a second mounting groove 6 are respectively provided on the rod body 1, the first sealing unit 2 is arranged in the first mounting groove 5, and the second sealing unit 3 is arranged in the second mounting groove 6.

[0044] See also Figure 5As shown, in some embodiments, the first sealing unit 2 includes at least one first sealing ring 201, and the first sealing ring 201 can be an O-type rubber ring (low cost and easy to install), or a lip sealing ring (good sealing performance under extrusion), etc., without specific limitation. The outer diameter of the first sealing ring 201 should be slightly larger than the actual inner diameter of the inner hole welded pipe hole, so as to obtain good sealing performance. In addition, the first sealing unit 2 also includes a first gasket 202, which is used to clamp and / or separate the first sealing ring 201, so that the first sealing ring 201 is reliably positioned, thereby ensuring the sealing effect.

[0045] For example, in the present application, there are two first sealing rings 201, thereby forming two seals, so that the effectiveness of the first sealing unit 2 is guaranteed. There is at least one first gasket 202, and the two first sealing rings 201 can be separated by the first gasket 202, or separated and clamped by the first gasket 202, so as to be fixed in the first installation groove 5.

[0046] See also Figure 6 As shown, in some embodiments, the second sealing unit 3 includes at least one second sealing ring 301. The second sealing ring 301 can be the same as or different from the first sealing ring 201. For example, the second sealing ring 301 is an O-type rubber ring, a plastic sealing ring, or a composite sealing ring.

[0047] In addition, the second sealing unit 3 also includes a second gasket 302. The second gasket 302 is similar to the first gasket 202 and is also used to clamp and / or separate the second sealing ring 301, which will not be described in detail herein.

[0048] For example, in the present application, there are two second sealing rings 301, thereby forming two seals, so that the effectiveness of the second sealing unit 3 is guaranteed. There is at least one second gasket 302, and the two second sealing rings 301 can be separated by the first gasket 202, or separated and clamped by the second gasket 302, so as to be fixed in the second installation groove 6.

[0049] See also Figure 2 and Figure 4 As shown, in some embodiments, the air inlet 4 includes an axial hole section and a radial hole section. The axial hole section is formed from the center of the air receiving end 101 of the rod body 1 and is colinear with the central axis of the rod body 1. The radial hole section is formed perpendicular to the rod body 1 and is formed inwardly, and is perpendicular to the central axis of the rod body 1 and is connected to the axial hole section.

[0050] Example 1

[0051] like Figure 1 and Figure 2As shown, in the inner hole welding gas leak detection tool of this embodiment, a step end 102 is provided at one end of the rod body 1 away from the gas connection end 101, and a support sleeve 7 and a top sleeve 8 are also provided on the rod body 1. Among them, one end of the support sleeve 7 cooperates with the step end 102 of the rod body 1 to form a first installation groove 5, and the other end of the support sleeve 7 cooperates with the top sleeve 8 to form a second installation groove 6.

[0052] The above structure makes the first installation groove 5 and the second installation groove 6 detachable, which is convenient for maintaining or replacing the sealing unit. In addition, by controlling the length of the support sleeve 7, the groove width can be flexibly adjusted to adapt to various types of sealing units, and the compatibility is good.

[0053] Further, a nut 9 is provided on one side of the top sleeve 8 away from the support sleeve 7, and the nut 9 is threadedly connected to the air receiving end 101 of the rod body 1. By tightening the nut 9, the top sleeve 8 can be pressed toward the support sleeve 7, so that the entire tooling is tightly matched and not loose.

[0054] Furthermore, the support sleeve 7 is fitted with the rod body 1 in a clearance, and a through hole connected to the air inlet 4 is arranged on the outer circumference of the support sleeve 7. This allows the gas input from the air inlet 4 to enter the through hole through the clearance, and then be transported to the weld of the inner hole weld through the through hole, thus ensuring the smooth operation of the air inlet 4.

[0055] Example 2

[0056] like Figure 3 and Figure 4 As shown, in the inner hole welding gas leak detection tool of this embodiment, the first installation groove 5 and the second installation groove 6 are formed by the depression of the rod body surface of the rod body 1, which has the advantages of simple structure and low manufacturing cost.

[0057] Specifically, the end of the rod body 1 away from the gas receiving end 101 is recessed to form a first installation groove 5, and the end of the rod body 1 close to the gas receiving end 101 is recessed to form a second installation groove 6. It is important to ensure that the end of the air inlet 4 away from the gas receiving end 101 is between the first installation groove 5 and the second installation groove 6. The first sealing unit 2 and the second sealing unit 3 are respectively installed in the first installation groove 5 and the second installation groove 6 to form the above-mentioned inner hole welding gas leak detection tooling.

[0058] Although the embodiments of the utility model have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the utility model. Ordinary technicians in the field can change, modify, replace and modify the above embodiments within the scope of the utility model without departing from the principles and purpose of the utility model. All of these changes should fall within the scope of protection of the claims of the utility model.

Claims

1. An inner hole welding gas leak detection tool, characterized in that: include: A rod body (1), wherein the rod body (1) is provided with a gas receiving end (101); A first sealing unit (2) and a second sealing unit (3) are respectively arranged at two ends of the rod body (1), wherein the first sealing unit (2) is used to seal one side of the inner hole weld, and the second sealing unit (3) is used to seal the other side of the inner hole weld; An air inlet hole (4), one end of the air inlet hole (4) being arranged at the air receiving end (101) of the rod body (1), and the other end of the air inlet hole (4) being arranged on the rod body surface of the rod body (1) and between the first sealing unit (2) and the second sealing unit (3).

2. The inner hole welding gas leak detection tool according to claim 1, characterized in that: The rod body (1) is respectively provided with a first mounting groove (5) and a second mounting groove (6); The first sealing unit (2) is arranged in the first installation groove (5), and the second sealing unit (3) is arranged in the second installation groove (6).

3. The inner hole welding gas leak detection tool according to claim 2, characterized in that: The first installation groove (5) and the second installation groove (6) are formed by depressions on the shaft surface of the rod body (1).

4. The inner hole welding gas leak detection tool according to claim 2, characterized in that: The rod body (1) is provided with a step end (102) at one end away from the gas receiving end (101), and the rod body (1) is provided with a support sleeve (7) and a top sleeve (8) respectively; One end of the support sleeve (7) cooperates with the step end (102) of the rod body (1) to form the first installation groove (5); The other end of the support sleeve (7) cooperates with the top sleeve (8) to form the second installation groove (6).

5. The inner hole welding gas leak detection tool according to claim 4, characterized in that: The support sleeve (7) is clearance-matched with the rod body (1), and a through hole communicating with the air inlet hole (4) is provided on the outer peripheral surface of the support sleeve (7).

6. The inner hole welding gas leak detection tool according to claim 4, characterized in that: A nut (9) is provided on a side of the top sleeve (8) away from the support sleeve (7), and the nut (9) is threadedly connected to the air connection end (101) of the rod body (1).

7. The inner hole welding gas leak detection tool according to claim 1, characterized in that: The first sealing unit (2) comprises at least one first sealing ring (201).

8. The inner hole welding gas leak detection tool according to claim 7, characterized in that: The first sealing unit (2) further comprises a first gasket (202), wherein the first gasket (202) is used for clamping and / or separating the first sealing ring (201).

9. The inner hole welding gas leak detection tool according to claim 1, characterized in that: The second sealing unit (3) comprises at least one second sealing ring (301).

10. The inner hole welding gas leak detection tool according to claim 9, characterized in that: The second sealing unit (3) comprises a second gasket (302), and the second gasket (302) is used to clamp and / or separate the second sealing ring (301).

Images