Composite board double-layer sealing integrated leakage detection structure and pressure container

Abstract

The utility model discloses a composite board double-layer sealing integrated leak detection structure and a pressure vessel, the leak detection structure comprises a composite board and a first leak detection tube, the composite board is provided with a leak detection hole, the bottom end of the first leak detection tube is fixedly connected with the hole bottom of the leak detection hole, and the upper end of the first leak detection tube extends out of the outer surface of the composite board; the composite board limiting block is fixedly connected with the composite board, a first through hole for the first leakage detection pipe to penetrate through is formed in the composite board limiting block, a gap is formed between the pipe wall of one side of the first leakage detection pipe and the first through hole, and a communication channel is formed in one side of the composite board limiting block; and one end of the communication channel is communicated with the first through hole in the composite plate limiting block, and the other end of the communication channel is communicated with a second leakage detection pipe fixed on the outer wall of the composite plate limiting block. According to the double-layer sealing integrated leakage detection structure of the composite board, the second leakage detection pipe is connected to the composite board limiting block, and the number of leakage detection holes in the shell is reduced by half, so that weakening of a welding seam of the shell is reduced, and the workload is also saved.

Description

Technical Field

[0001] The utility model relates to a double-layer sealing welding technology for a titanium or zirconium-steel composite plate pressure vessel, in particular to a double-layer sealing integrated leak detection structure for a titanium or zirconium-steel composite plate. Background Art

[0002] Titanium and zirconium can only be explosively composited with steel and cannot be directly welded. In pressure vessels made of titanium-steel composite plates or zirconium-steel composite plates, the welding joints of the main welds often adopt a double-layer sealed composite welding structure. The advantage of this structure is that if the composite layer of the equipment leaks, the leaked corrosive medium will not immediately contact the carbon steel base layer, avoiding rapid corrosive damage to the carbon steel base layer with poor corrosion resistance.

[0003] To monitor equipment leaks in real time, leak detection holes are installed on each base weld, with leak detection tubes leading outside the equipment. This allows for quick detection by inspectors, as dripping or smoke will appear outside the leak detection tubes in the event of a leak. The leak detection holes serve two primary purposes: first, during container operation or leak testing, any corrosion or poor welds in the cover (or strip) welds that may cause leaks can be observed or detected through the holes on the back. Second, during welding of the cover (or strip) welds, argon gas can be introduced through the holes to protect the back of the weld from oxidation.

[0004] Leak detection holes are generally located at both ends of the longitudinal weld and on both sides of the girth weld partition. The "girth weld partition" is a method of completely isolating the cavity between the base weld and the cover plate (strip) on the inside of the cover plate using methods such as silver brazing, forming independent "chambers." The purpose is to determine the location of the weld defect on the cover plate when a leak is detected through the leak detection holes, allowing for quick identification and repair. For long welds, multiple "partitions" may be required, such as for girth welds over DN2000.

[0005] Because the thermal expansion coefficients of the titanium clad layer and the steel base layer are different, the cover plate weld may leak due to corrosion and other reasons after the equipment is working. Once leakage occurs, the corrosive medium will quickly corrode the carbon steel base layer, causing safety risks. Therefore, most titanium-steel composite plate container manufacturing companies have designed a double-layer sealing structure for titanium-steel composite plate containers based on this.

[0006] The main change of this structure is that the gasket and the cladding are welded together by sealing welding, so that the medium leaking through the cover weld can be discharged through the titanium leak detection tube without contacting the corrosion-resistant base layer.

[0007] In order to detect the sealing of the titanium gasket, that is, whether the second seal is leaking, a leak detection hole for installing the second leak detection tube must be drilled next to the leak detection hole for installing the first leak detection tube. Figure 1 As shown:

[0008] Thus, one weld chamber requires four leak detection holes, which are distributed as follows: Figure 2 As shown:

[0009] Too many leak holes will weaken the shell welds and increase the workload. Utility Model Content

[0010] In order to overcome the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a composite plate double-layer sealed integrated leak detection structure to solve the problems existing in the prior art.

[0011] The technical solution adopted in this utility model is:

[0012] A composite plate double-layer sealed integrated leak detection structure includes a composite plate and a first leak detection tube. The composite plate is composed of a composite plate base and a composite plate layer, and has a leak detection hole. The bottom end of the first leak detection tube is fixedly connected to the bottom of the leak detection hole, and the upper end extends out of the outer surface of the composite plate.

[0013] A sealing structure installation groove is provided on the composite plate layer on the inner side of the composite plate base and on both sides of the bottom of the leak detection hole, and a gasket strip having a thickness matching the thickness of the composite plate layer is installed in the sealing structure installation groove; the bottom end of the composite plate layer, the bottom end of the gasket strip and the bottom end of the first leak detection tube are flush with each other and a sticker strip covering the entire sealing structure installation groove is welded thereto;

[0014] It also includes a radial limiting mechanism for limiting the radial displacement of the first leak detection tube caused by external force, and the radial limiting mechanism includes:

[0015] The composite plate limit block is fixedly connected to the outer surface of the composite plate base, and is provided with a first through hole for the first leak detection tube to pass through. The composite plate limit block is used to limit the radial displacement of the first leak detection tube after the first leak detection tube is subjected to external force. A gap is provided between at least one side wall of the first leak detection tube and the first through hole, characterized in that:

[0016] A connecting channel is provided on one side of the composite plate limiting block, one end of the connecting channel is connected to the first through hole on the composite plate limiting block, and the other end of the connecting channel is connected to a second leak detection pipe fixed on the outer wall of the composite plate limiting block.

[0017] The aperture of the leak detection hole is 2 mm to 4 mm larger than the outer diameter of the first leak detection tube.

[0018] The composite plate base layer is a steel material layer, and the composite plate cladding layer is a titanium or zirconium material layer;

[0019] The material of the gasket is titanium or zirconium;

[0020] The first leak detection tube is made of titanium or zirconium.

[0021] The composite plate limit block includes a limit block base layer and a limit block cladding layer, wherein the limit block base layer is made of steel, and the limit block cladding layer is made of titanium or zirconium;

[0022] The communication channel is opened on the base layer of the limit block, and the material of the second leak detection tube is steel;

[0023] It also includes an axially flexible limiting mechanism for flexibly limiting the axial deformation of the first leak detection tube caused by temperature difference, and the axially flexible limiting mechanism includes:

[0024] A plate-shaped limiting portion is provided on the upper surface of the limiting block layer, an outer end portion of the plate-shaped limiting portion is fixedly connected to the limiting block layer, a second through hole for the first leak detection tube to pass through is opened on the plate-shaped limiting portion, and the edge of the second through hole on the plate-shaped limiting portion is fixedly connected to the upper outer tube wall of the first leak detection tube;

[0025] The plate-shaped limiting portion is made of titanium or zirconium.

[0026] The bottom of the first leak detection tube is fixed to the gasket strip on the inner side of the bottom of the leak detection hole by welding through a first weld;

[0027] The outer end of the limit block base layer is fixed to the outer surface of the composite plate base layer by welding through a second weld;

[0028] The outer end of the plate-shaped limiting portion is fixed to the limiting block composite layer by welding through a third weld;

[0029] The plate-shaped limiting portion is fixed by welding between the edge of the second through hole and the upper outer tube wall of the first leak detection tube through a fourth weld.

[0030] An annular gap is provided between the upper end of the composite plate limiting block near the opening of the first through hole and the plate-shaped limiting portion, and the annular gap is used to compensate for the effect of temperature difference stress on the first weld.

[0031] The longitudinal section of the annular gap is in an inverted cone shape.

[0032] A pressure vessel adopts the composite plate double-layer sealed integrated leak detection structure.

[0033] Beneficial effects:

[0034] First, the utility model composite plate double-layer sealed integrated leak detection structure, through the composite plate limit block, can be simultaneously welded with the composite plate base and the leak detection tube fixed, so that the first leak detection tube is firmly fixed and can withstand the general external force.

[0035] Second, the present invention drills a hole in the stopper base and welds a second leak detection tube to the hole. This connects the second leak detection tube to the gap between the first leak detection tube wall and the first through-hole via a connecting channel. If the first seal leaks, the medium will seep out of the first leak detection tube; if the second seal also leaks, the medium will seep out of the second leak detection tube.

[0036] Third, since the second leak detection pipe is connected to the base of the limit block, the number of leak detection holes on the shell is reduced by half, which reduces the weakening of the shell weld and saves workload.

[0037] Fourth, make the position of the leak detection hole more reasonable. When the back is filled with argon for protection, avoid the formation of a dead zone in the connecting channel due to its distance from the isolation point. Some air cannot be discharged, affecting the purity of the back protection argon gas, thereby affecting the back oxidation of the titanium weld.

[0038] Fifth, a plate-shaped stopper is placed above the composite plate stopper, leaving a gap between the plate-shaped stopper and the composite plate stopper. This allows the first leak detection tube to be flexibly fixed axially on the composite plate base, allowing for deformation caused by temperature differences, preventing weld cracking, and ensuring long-term effectiveness. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 This is a structural diagram of an existing pressure vessel in which two leak detection pipes are provided on the shell;

[0040] Among them, 3' is the existing first leak-picking pipe; 17' is the existing second leak-picking pipe;

[0041] Figure 2 This is a structural diagram of an existing pressure vessel where one weld chamber requires four leak detection holes;

[0042] Among them, A is the leak detection hole for installing the existing first leak detection pipe; B is the leak detection hole for installing the existing second leak detection pipe; C is the annular seam partition; D is the longitudinal annular seam partition;

[0043] Figure 3 This is a schematic diagram of the utility model composite plate double-layer sealing integrated leak detection structure;

[0044] Among them, 1-composite plate base; 2-composite plate composite layer; 3-first leak detection tube; 4-gasket; 5-composite plate limit block; 6-plate limit part; 7-first weld; 8-second weld; 9-third weld; 10-fourth weld; 11-annular gap; 12-composite plate base weld; 13-tape; 14-tape weld; 17-second leak detection tube;

[0045] Figure 4 yes Figure 3 AA section view;

[0046] Figure 5 It is a structural diagram of the composite board of the utility model;

[0047] Among them, 15-seal welding; 16-leak detection hole;

[0048] Figure 6 This is a structural diagram of the plate-shaped limiting portion of the utility model;

[0049] Figure 7 It is a structural schematic diagram of the composite plate limit block of the utility model. DETAILED DESCRIPTION

[0050] The technical solution of the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments. Example

[0051] A composite plate double-layer sealed integrated leak detection structure includes a composite plate and a first leak detection tube 3. The composite plate is composed of a composite plate base layer 1 and a composite plate layer 2, and has a leak detection hole formed thereon. The bottom end of the first leak detection tube 3 is fixedly connected to the bottom of the leak detection hole, and the upper end extends out of the outer surface of the composite plate.

[0052] A sealing structure installation groove is provided on the composite plate layer on the inner side of the composite plate base layer 1 and on both sides of the bottom of the leak detection hole. A gasket strip 4 having a thickness matching the thickness of the composite plate layer is installed in the sealing structure installation groove. The bottom end of the composite plate layer, the bottom end of the gasket strip, and the bottom end of the first leak detection tube are flush with each other and welded with a sticker strip 13 covering the entire sealing structure installation groove.

[0053] It also includes a radial limiting mechanism for limiting the radial displacement of the first leak detection tube 3 caused by external force, and the radial limiting mechanism includes:

[0054] The composite plate limit block 5 is fixedly connected to the outer surface of the composite plate base 1, and is provided with a first through hole for the first leak detection tube 3 to pass through. The composite plate limit block 5 is used to limit the radial displacement of the first leak detection tube 3 after the first leak detection tube is subjected to external force. A gap is provided between at least one side wall of the first leak detection tube 3 and the first through hole, characterized in that:

[0055] A connecting channel is provided on one side of the composite plate limit block 5 , one end of the connecting channel is connected to the first through hole on the composite plate limit block 5 , and the other end of the connecting channel is connected to a second leak detection pipe 17 fixed on the outer wall of the composite plate limit block 5 .

[0056] The utility model drills a hole in the base of the stopper block and welds a second leak detection tube 17 to the hole. This connects the second leak detection tube 17 to the gap between the wall of the first leak detection tube 3 and the first through hole through a connecting channel. If the first seal leaks, the medium will seep out of the first leak detection tube 3; if the second seal also leaks, the medium will seep out of the second leak detection tube 17.

[0057] As a preferred embodiment of the technical solution of this embodiment, the diameter of the leak detection hole is 2 mm to 4 mm larger than the outer diameter of the first leak detection tube.

[0058] In this embodiment, the composite plate base layer 1 is a steel material layer, and the composite plate cladding layer 2 is a titanium or zirconium material layer;

[0059] The composite plate limit block 5 includes a limit block base layer and a limit block cladding layer. The limit block base layer is made of steel, and the limit block cladding layer is made of titanium or zirconium. The pad 4 is made of titanium or zirconium. The plate-shaped limit portion 6 is made of titanium or zirconium. The leak detection tube 3 is made of titanium or zirconium.

[0060] Figure 3 After the gasket 4 and the composite plate layer 2 are sealed and welded, and after the sealing weld is subjected to penetration testing and leakage testing, a through hole is drilled from the side of the gasket 4 to the side of the composite plate base 1, the aperture being preferably 1mm larger than the first leak detection tube 3. Example

[0061] It also includes an axially flexible limiting mechanism for flexibly limiting the axial deformation of the first leak detection tube caused by temperature difference, and the axially flexible limiting mechanism includes:

[0062] A plate-shaped limiting portion 6 is arranged on the upper surface of the limiting block composite layer, and the outer end of the plate-shaped limiting portion 6 is fixedly connected to the limiting block composite layer. A second through hole is opened on the plate-shaped limiting portion 6 for the first leak detection tube 3 to pass through, and the edge of the second through hole on the plate-shaped limiting portion 6 is fixedly connected to the upper outer tube wall of the first leak detection tube 3; the material of the plate-shaped limiting portion 6 is titanium or zirconium.

[0063] In this embodiment, an annular gap 11 is provided between the upper end of the composite plate limit block 5 near the opening of the first through hole and the plate-shaped limit portion 6 . The annular gap 11 is used to compensate for the effect of temperature difference stress on the first weld 7 .

[0064] As a further preferred embodiment of the technical solution, the longitudinal section of the annular gap 11 is in the shape of an inverted cone.

[0065] according to Figure 6 and Figure 7 Cut and machine the composite plate limit block and plate shape limit part separately:

[0066] Assemble the first leak detection tube 3, composite plate stopper 5, and plate-shaped stopper 6 onto the leak detection hole, aligning the inner end of the first leak detection tube 3 with the surface of the backing strip. Then, spot weld them in place, and then weld them separately to form. Using titanium or zirconium-steel composite plate to make the composite plate stopper 5, it can be welded to both the steel composite plate base 1 and the titanium or zirconium-based first leak detection tube 3, ensuring a secure fit and withstanding normal external forces.

[0067] A plate-shaped stopper 6 made of titanium or zirconium is placed above the composite plate stopper 5, with a certain annular gap 11 left between the plate-shaped stopper 6 and the composite plate stopper 5. This secures the first leak detection tube 3 to the composite plate base 1 side with rigidity in the radial direction and flexibility in the axial direction, allowing for deformation caused by temperature differences, preventing weld cracking, and ensuring long-term effectiveness.

Claims

1. A composite plate double-layer sealed integrated leak detection structure, comprising a composite plate and a first leak detection tube. The composite plate is composed of a composite plate base and a composite plate layer, and has a leak detection hole formed therein. The bottom end of the first leak detection tube is fixedly connected to the bottom of the leak detection hole, and the upper end extends out of the outer surface of the composite plate. A sealing structure installation groove is provided on the composite plate layer on the inner side of the composite plate base and on both sides of the bottom of the leak detection hole, and a gasket strip having a thickness matching the thickness of the composite plate layer is installed in the sealing structure installation groove; the bottom end of the composite plate layer, the bottom end of the gasket strip and the bottom end of the first leak detection tube are flush with each other and a sticker strip covering the entire sealing structure installation groove is welded thereto; It also includes a radial limiting mechanism for limiting the radial displacement of the first leak detection tube caused by external force, and the radial limiting mechanism includes: The composite plate limit block is fixedly connected to the outer surface of the composite plate base, and is provided with a first through hole for the first leak detection tube to pass through. The composite plate limit block is used to limit the radial displacement of the first leak detection tube caused by external force. A gap is provided between at least one side wall of the first leak detection tube and the first through hole, characterized in that: A communication channel is provided on one side of the composite plate limit block, one end of the communication channel is connected to the first through hole on the composite plate limit block, and the other end of the communication channel is connected to a second leak detection tube fixed on the outer wall of the composite plate limit block.

2. The composite plate double-layer sealed integrated leak detection structure according to claim 1, characterized in that: The diameter of the leak detection hole is 2 mm to 4 mm larger than the outer diameter of the first leak detection tube.

3. The composite plate double-layer sealed integrated leak detection structure according to claim 1, characterized in that: The composite plate base layer is a steel material layer, and the composite plate cladding layer is a titanium or zirconium material layer; The material of the gasket is titanium or zirconium; The first leak detection tube is made of titanium or zirconium.

4. The composite plate double-layer sealed integrated leak detection structure according to claim 1, characterized in that: The composite plate limit block includes a limit block base layer and a limit block cladding layer, wherein the limit block base layer is made of steel, and the limit block cladding layer is made of titanium or zirconium; The communication channel is opened on the base layer of the limit block, and the material of the second leak detection tube is steel; It also includes an axially flexible limiting mechanism for flexibly limiting the axial deformation of the first leak detection tube caused by temperature difference, and the axially flexible limiting mechanism includes: A plate-shaped limiting portion is provided on the upper surface of the limiting block layer, an outer end portion of the plate-shaped limiting portion is fixedly connected to the limiting block layer, a second through hole for the first leak detection tube to pass through is opened on the plate-shaped limiting portion, and the edge of the second through hole on the plate-shaped limiting portion is fixedly connected to the upper outer tube wall of the first leak detection tube; The plate-shaped limiting portion is made of titanium or zirconium.

5. The composite plate double-layer sealed integrated leak detection structure according to claim 4, characterized in that: The bottom of the first leak detection tube is fixed to the gasket strip on the inner side of the bottom of the leak detection hole by welding through a first weld; The outer end of the limit block base layer is fixed to the outer surface of the composite plate base layer by welding through a second weld; The outer end of the plate-shaped limiting portion is fixed to the limiting block composite layer by welding through a third weld; The plate-shaped limiting portion is fixed by welding between the edge of the second through hole and the upper outer tube wall of the first leak detection tube through a fourth weld.

6. The composite plate double-layer sealed integrated leak detection structure according to claim 5, characterized in that: An annular gap is provided between the upper end of the composite plate limiting block near the opening of the first through hole and the plate-shaped limiting portion, and the annular gap is used to compensate for the effect of temperature difference stress on the first weld.

7. The composite plate double-layer sealed integrated leak detection structure according to claim 6, characterized in that: The longitudinal section of the annular gap is in an inverted cone shape.

8. A pressure vessel, characterized in that: A composite plate double-layer sealed integrated leak detection structure as described in any one of claims 1 to 7 is adopted.

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