Single-tube leak detection device for heat exchanger tube bundle

Abstract

The utility model provides a single tube leak detection device for a heat exchanger tube bundle, which belongs to the technical field of heat exchanger leak detection and is used for solving the problem of single tube leak detection of a tube bundle. The single-tube leak detection device for the heat exchanger tube bundle comprises a connecting support and a leak detection assembly. And the connecting bracket is detachably arranged on the tube plate. The leak detection assembly comprises a main pipe, an inspection cover and a positioning core. And the main pipe is movably arranged on the connecting bracket. The inspection cover comprises a large-diameter end and a small-diameter end. And the small-diameter end is connected to the end part of the main pipe. The large-diameter end can be connected with the plate face of the tube plate in a sealed mode so that the heat exchange tube and a connector welding seam of the heat exchange tube can be buckled in the large-diameter end. And the positioning core is arranged in the inspection cover. The positioning core communicates with the main pipe. The positioning core is used for being inserted into the heat exchange tube. The device has the capability of simultaneously detecting pipe and pipe joint welds, and is simple and efficient to operate.

Description

Technical Field

[0001] This utility model belongs to the field of heat exchanger leak detection technology, specifically relating to a single tube leak detection device for heat exchanger tube bundles. Background Technology

[0002] The air separation unit's gas cooler tube bundle has a unique structure; the tube bundle fins are made of aluminum and generally do not come into contact with water. Shell-side hydrostatic testing is typically not performed to check for leaks in the heat exchange tubes and tube end welds. Therefore, routine leak detection can only be done through tube-side hydrostatic testing. However, because all tube ends are interconnected, it's impossible to pinpoint the specific leaking heat exchange tube. To determine the specific leaking heat exchange tube, single-tube leak testing is required. Currently, single-tube leak testing tools use an expansion joint to seal the ends of the heat exchange tube, then pass water through the tube for hydrostatic testing. However, this only determines if the heat exchange tube is leaking; it cannot monitor for leaks at the weld between the heat exchange tube and the tube sheet. Furthermore, the operation is cumbersome and has low leak detection efficiency. Utility Model Content

[0003] Therefore, the technical problem to be solved by this utility model is to provide a single tube leak detection device for heat exchanger tube bundles, which can simultaneously detect whether the heat exchange tube and the weld of the tube joint are leaking, and has high leak detection efficiency and is easy to operate.

[0004] To address the aforementioned problems, this utility model provides a single-tube leak detection device for heat exchanger tube bundles, comprising a connecting bracket and a leak detection assembly. The connecting bracket is detachably mounted on the tube sheet. The leak detection assembly includes a main tube, an inspection cover, and a positioning core. The main tube is movably mounted on the connecting bracket. The inspection cover includes a large-diameter end and a small-diameter end. The small-diameter end is connected to the end of the main tube. The large-diameter end can be sealed to the surface of the tube sheet to enclose the heat exchanger tube and its joint weld. The positioning core is disposed within the inspection cover. The positioning core communicates with the main tube. The positioning core is used for insertion into the heat exchanger tube.

[0005] Optionally, the connecting bracket includes a connecting seat, a pair of transverse guide rails, and a longitudinal support beam. The connecting seat is detachably mounted on the tube sheet. The pair of transverse guide rails are arranged parallel to each other on the connecting seat. The longitudinal support beam is supported between the pair of transverse guide rails and is movable along the transverse guide rails. The main pipe is mounted on the longitudinal support beam and is movable along the longitudinal support beam.

[0006] Optionally, the connecting seat includes at least two first connecting sleeves, at least two second connecting sleeves, a first fixing beam, and a second fixing beam. Each first connecting sleeve is connected to the tube sheet by a support bolt. The at least two first connecting sleeves are coaxially arranged. Each second connecting sleeve is connected to the tube sheet by a support bolt. The at least two second connecting sleeves are coaxially arranged. The axis of the second connecting sleeve is parallel to the axis of the first connecting sleeve. The first fixing beam is disposed in the at least two first connecting sleeves. The second fixing beam is disposed in the at least two second connecting sleeves. A transverse guide rail is mounted between the first fixing beam and the second fixing beam.

[0007] Optionally, the outer wall of the main pipe is provided with external threads. The leak detection assembly also includes a baffle and an adjusting wheel. The baffle is movably fitted onto the main pipe. The baffle is located between the connecting bracket and the tube sheet. The adjusting wheel is fitted onto the main pipe and is threadedly connected to the outer wall of the main pipe. The adjusting wheel is located on the side of the baffle away from the connecting bracket. By rotating the adjusting wheel, the baffle can be pressed tightly against the connecting bracket. Under the reaction force of the connecting bracket, the inspection cover can be pressed tightly against the surface of the tube sheet.

[0008] Optionally, the leak detection assembly also includes a connecting sleeve. One end of the connecting sleeve is connected to the main pipe. The end of the connecting sleeve furthest from the main pipe is connected to the small-diameter end of the inspection cover. The end of the positioning core located inside the inspection cover passes sequentially through the inspection cover and the connecting sleeve, and is connected to the main pipe.

[0009] Optionally, a first sealing structure is provided between the contact surfaces of the connecting sleeve and the inspection cover.

[0010] Optionally, a second sealing structure is provided on the end face of the large-diameter end of the inspection cover.

[0011] Optionally, the leak detection assembly also includes a pressure gauge. The pressure gauge is connected to the main pipe.

[0012] Optionally, the leak detection assembly also includes a first shut-off valve. The first shut-off valve is located on the main pipe, near the end of the main pipe furthest from the positioning core.

[0013] Optionally, a backup port is provided on the main pipe. The backup port is equipped with a second shut-off valve.

[0014] Beneficial effects

[0015] This utility model provides a single-tube leak detection device for heat exchanger tube bundles, comprising connecting brackets and leak detection components. During installation, connecting brackets are installed on tube sheets on both sides of the tube bundle, with one leak detection component on each bracket. The positioning cores of two leak detection components are inserted into both ends of a heat exchanger tube, and the two ends of the heat exchanger tube and the joint weld are secured within the inspection cover. The two leak detection components serve as the inlet and outlet water ends, respectively. During leak detection, the leak detection component at the outlet water end is closed, while water is passed through the leak detection component at the inlet water end, filling the heat exchanger tube and the inspection cover with water and maintaining pressure. If the internal pressure drops, it indicates a leak in the heat exchanger tube itself or at the joint weld of the heat exchanger tube. After completing the leak detection of one heat exchanger tube, the main pipe on the connecting bracket is moved to align with other heat exchanger tubes, allowing for leak detection of other heat exchanger tubes and joint welds. The single-tube leak detection device for heat exchanger tube bundles in this application is suitable for single-tube leak detection of finned tube bundles in air separation units. It has the ability to simultaneously inspect tubes and tube joint welds, and is simple and efficient to operate, with accurate leak detection. It can also be applied to single-tube leak detection in air conditioning refrigeration radiators and other fields where shell-side pressure testing is not possible. Attached Figure Description

[0016] Figure 1 A schematic diagram of the installation structure of a single-tube leak detection device for a heat exchanger tube bundle according to an embodiment of this utility model;

[0017] Figure 2 for Figure 1 Enlarged view of point A;

[0018] Figure 3 A front view of a connecting bracket according to an embodiment of this utility model;

[0019] Figure 4 A side view of a connecting bracket according to an embodiment of the present invention;

[0020] Figure 5 A partial cross-sectional view of a leak detection component according to an embodiment of the present invention.

[0021] The reference numerals in the attached figures are as follows:

[0022] 1. Connecting bracket; 2. Leak detection assembly; 3. Tube sheet; 4. Heat exchange tubes; 5. Joint weld;

[0023] 11. Transverse guide rail; 12. Longitudinal support beam; 13. First connecting sleeve; 14. Support bolt; 15. Second connecting sleeve; 16. First fixing beam; 17. Second fixing beam;

[0024] 20. Bearing; 21. Main pipe; 22. Inspection cover; 23. Positioning core; 24. Baffle; 25. Adjusting wheel; 26. Connecting sleeve; 27. First sealing structure; 28. Second sealing structure; 29. ​​Pressure gauge;

[0025] 211. First shut-off valve; 212. Spare port; 213. Second shut-off valve;

[0026] 221. Large diameter end; 222. Small diameter end;

[0027] 231. First paragraph; 232. Second paragraph;

[0028] 261. First pipe section; 262. Second pipe section; 263. Third pipe section. Detailed Implementation

[0029] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0030] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0031] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0032] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0033] This embodiment provides a single-tube leak detection device for heat exchanger tube bundles. Figure 1 This is a schematic diagram of the installation structure of a single-tube leak detection device for a heat exchanger tube bundle provided in this embodiment. Figure 2 for Figure 1 Enlarged view of point A.

[0034] like Figure 1 and Figure 2 As shown, the single-tube leak detection device for heat exchanger tube bundles in this embodiment includes a connecting bracket 1 and a leak detection assembly 2. The connecting bracket 1 is detachably mounted on the tube sheet 3. The leak detection assembly 2 includes a main tube 21, an inspection cover 22, and a positioning core 23. The main tube 21 is movably mounted on the connecting bracket 1. The inspection cover 22 includes a large-diameter end 221 and a small-diameter end 222. The small-diameter end 222 is connected to the end of the main tube 21. The large-diameter end 221 can be sealed to the surface of the tube sheet 3 to secure the heat exchange tube 4 and its joint weld 5. The positioning core 23 is disposed in the inspection cover 22. The positioning core 23 communicates with the main tube 21. The positioning core 23 is used for insertion into the heat exchange tube 4.

[0035] The single-tube leak detection device for heat exchanger tube bundles in this embodiment includes a connecting bracket 1 and a leak detection assembly 2. During installation, connecting brackets 1 are respectively installed on tube sheets 3 on both sides of the tube bundle, and one leak detection assembly 2 is installed on each connecting bracket 1. The positioning cores 23 of the two leak detection assemblies 2 are respectively inserted into both ends of a heat exchange tube 4, and the two ends of the heat exchange tube 4 and the joint weld 5 are respectively secured inside by the inspection cover 22. The two leak detection assemblies 2 serve as the inlet and outlet water ends, respectively.

[0036] During leak detection, the leak detection component 2 at the outlet is closed, and high-pressure water is introduced into the leak detection component 2 at the inlet, filling the heat exchange tube 4 and the inspection cover 22 with water and maintaining pressure. A pressure monitoring device (e.g., pressure sensor, pressure gauge, etc.) is used to monitor the water pressure between the two leak detection components 2. If the pressure drops, it indicates a leak in the heat exchange tube 4 itself or in the weld seam 5 of the joint of the heat exchange tube 4. After completing the leak detection of one heat exchange tube 4, the main pipe 21 on the connecting bracket 1 is moved and aligned with other heat exchange tubes 4 to perform leak detection on the other heat exchange tubes 4 and the weld seams 5.

[0037] The single-tube leak detection device for heat exchanger tube bundles in this application is suitable for single-tube leak detection of finned tube bundles in air separation units. It has the ability to simultaneously detect heat exchange tubes 4 and joint welds 5. It is simple and efficient to operate and has accurate leak detection. It can also be applied to single-tube leak detection in air conditioning refrigeration radiators and other fields where shell-side pressure testing is not possible.

[0038] Figure 3 This is a front view of a connecting bracket 1 provided in this embodiment. Figure 4This is a side view of a connecting bracket 1 provided in this embodiment. In some embodiments, such as... Figure 3 and Figure 4 As shown, the connecting bracket includes a connecting seat, a pair of transverse guide rails 22 11, and a longitudinal support beam 12. The connecting seat is detachably mounted on the tube sheet 3. The pair of transverse guide rails 22 are arranged parallel to each other on the connecting seat. The longitudinal support beam 12 is mounted between the pair of transverse guide rails 11 and can move along the transverse guide rails 11. The main tube 21 is mounted on the longitudinal support beam 12 and can move along the longitudinal support beam 12.

[0039] The connector 1 in this embodiment includes a connecting seat, a pair of transverse guide rails 11, and a longitudinal support beam 12. The pair of transverse guide rails 11 are mounted on the connecting seat, and the longitudinal support beam 12 is mounted between the pair of transverse guide rails 11 and can move along the transverse guide rails 11. The main pipe 21 is mounted on the longitudinal support beam 12 and can move along the longitudinal support beam 12. Therefore, in use, the main pipe 21 has two degrees of freedom in both the transverse and longitudinal directions, allowing its movement range to cover all the heat exchange tubes 4 on the tube sheet 3, making it more convenient to use and eliminating the need for repeated installation and disassembly of the connector 1 and the leak detection assembly 2.

[0040] In some embodiments, such as Figure 3 and Figure 4 As shown, the connecting seat includes at least two first connecting sleeves 13, at least two second connecting sleeves 15, a first fixing beam 16, and a second fixing beam 17. Each first connecting sleeve 13 is connected to the tube sheet 3 by a support bolt 14. The at least two first connecting sleeves 13 are coaxially arranged. Each second connecting sleeve 15 is connected to the tube sheet 3 by a support bolt 14. The at least two second connecting sleeves 15 are coaxially arranged. The axis of the second connecting sleeve 15 is parallel to the axis of the first connecting sleeve 13. The first fixing beam 16 is disposed in the at least two first connecting sleeves 13. The second fixing beam 17 is disposed in the at least two second connecting sleeves 15. A transverse guide rail 11 is mounted between the first fixing beam 16 and the second fixing beam 17.

[0041] In this embodiment, the first connecting sleeve 13, the second connecting sleeve 15 and the supporting bolt 14 are used to support the first fixed beam 16 and the second fixed beam 17, so that there is a sufficient distance between the first fixed beam 16 and the second fixed beam 17 and the surface of the tube sheet 3, thereby ensuring a sufficient distance between the pair of transverse guide rails 11 and the surface of the tube sheet 3, which facilitates the movement and use of the leak detection component 2.

[0042] Figure 5 A partial cross-sectional view of a leak detection component 2 provided in this embodiment. In some embodiments, such as Figure 5As shown, the outer wall of the main pipe 21 is provided with external threads. The leak detection assembly 2 also includes a baffle 24 and an adjusting wheel 25. The baffle 24 is movably fitted onto the main pipe 21. The baffle 24 is located between the connecting bracket 1 and the tube sheet 3. The adjusting wheel 25 is fitted onto the main pipe 21 and is connected to the outer wall of the main pipe 21 by a threaded engagement. The adjusting wheel 25 is located on the side of the baffle 24 away from the connecting bracket 1. By rotating the adjusting wheel 25, the baffle 24 can be pressed tightly against the connecting bracket 1. Under the reaction force of the connecting bracket 1, the inspection cover 22 can be pressed tightly against the surface of the tube sheet 3.

[0043] In some examples, such as Figure 5 As shown, a bearing 20 is also fitted on the main pipe 21. The bearing 20 is located between the baffle 24 and the adjusting wheel 25. This arrangement helps to reduce the friction between the adjusting wheel 25 and the baffle 24, facilitates the rotation of the adjusting wheel 25, and prevents wear between the adjusting wheel 25 and the baffle 24.

[0044] In this embodiment, the outer wall of the main pipe 21 is provided with external threads. The baffle 24 is movably sleeved on the main pipe 21, and the adjusting wheel 25 is sleeved on the main pipe 21 and connected to the outer wall of the main pipe 21 by threaded engagement. When the main pipe 21 is installed on the connecting bracket 1, the main pipe 21 is located between a pair of longitudinal support beams 12, the positioning core 23 is inserted into the heat exchange tube 4 to be inspected, and the baffle 24 is located on the side of the pair of longitudinal support beams 12 closer to the tube sheet 3. The baffle 24 is adjusted to be parallel to the plate surface of the tube sheet 3, and the adjusting wheel 25 is rotated to press the baffle 24 tightly onto the pair of longitudinal support beams 12. The inspection cover 22 is pressed onto the plate surface of the tube sheet 3 under the reaction force of the pair of longitudinal support beams 12. The adjusting wheel 25 is rotated again to press the inspection cover 22 tightly onto the tube sheet 3, so that one end of the heat exchange tube 4 and the joint weld 5 at its end are fastened inside to form a seal. See Figure 2 Then, install the leak detection assembly 2 on the other side of the tube sheet 3 using the same method, aligning it with the same heat exchange tube 4. Next, connect one leak detection assembly 2 to the high-pressure water inlet pipe and close the valve of the leak detection assembly 2 on the other side of the tube sheet 3. During leak detection, water is introduced into the leak detection assembly 2 on the inlet side. After reaching the leak detection pressure, the pressure is maintained, and internal pressure changes are monitored. If the pressure drops, this heat exchange tube 4 or the joint weld 5 is leaking. After one heat exchange tube 4 has been inspected, move the position of the main pipe 21 to inspect the next heat exchange tube 4 until the tube bundle leak detection is complete.

[0045] In some embodiments, such as Figure 2 and Figure 5 As shown, the leak detection assembly 2 also includes a connecting sleeve 26. One end of the connecting sleeve 26 is connected to the main pipe 21. The end of the connecting sleeve 26 away from the main pipe 21 is connected to the small-diameter end 222 of the inspection cover 22. The end of the positioning core 23 located inside the inspection cover 22 passes through the inspection cover 22 and the connecting sleeve 26 in sequence, and is connected to the main pipe 21.

[0046] In this embodiment, the inspection cover 22 and the positioning core 23 are connected to the main tube 21 by the connecting sleeve 26, which facilitates assembly and ensures the sealing and stability of the connection between the inspection cover 22 and the positioning core 23 and the main tube 21.

[0047] In some embodiments, such as Figure 2 and Figure 5 As shown, a first sealing structure 27 is provided between the contact surfaces of the connecting sleeve 26 and the inspection cover 22.

[0048] In this embodiment, a first sealing structure 27 is provided between the contact surfaces of the connecting sleeve 26 and the inspection cover 22, see reference. Figure 2 The first sealing structure 27 includes a first sealing groove and a first sealing ring. The first sealing groove is located on the end face of the connecting sleeve 26 that contacts the inspection cover 22, and the first sealing ring is disposed in the first sealing groove.

[0049] In some embodiments, such as Figure 2 As shown, the interior of the connecting sleeve 26 includes, from left to right, a first pipe section 261, a second pipe section 262, and a third pipe section 263 arranged coaxially. The third pipe section 263 is provided with an internal thread. The connecting sleeve 26 is sleeved on the end of the main pipe 21 through the third pipe section 263, and is connected to the external thread of the main pipe 21 through the internal thread of the third pipe section 263.

[0050] The positioning core 23 includes a first section 231 and a second section 232 that are connected to each other. The outer diameter of the first section 231 is larger than the outer diameter of the second section 232. The first section 231 is used to be inserted into the heat exchange tube 4. The outer surface of the second section 232 has external threads.

[0051] The inner wall of the second pipe section 262 of the connecting sleeve 26 has internal threads. The small diameter end 222 of the inspection cover 22 has internal threads. The second section 232 of the positioning core 23 passes through the small diameter end 222 of the inspection cover 22, the second pipe section 262 of the connecting sleeve 26, and extends into the main pipe 21. The second section 232 of the positioning core 23 is connected to the small diameter end 222 of the inspection cover 22 and the second pipe section 262 of the connecting sleeve 26 by threaded engagement.

[0052] By rotating the inspection cover 22, the inspection cover 22 can be moved along the second section 232 of the positioning core 23 to press the first sealing ring of the first sealing structure 27, thereby achieving a seal between the inspection cover 22 and the connecting sleeve 26.

[0053] In some embodiments, such as Figure 2 As shown, the outer side of the first segment 231 of the positioning core 23 has an arc-shaped protrusion that conforms to the inner wall of the heat exchange tube 4 for better positioning. In this embodiment, the positioning core 23 is made of a metal material with good elasticity, such as copper or stainless steel.

[0054] In some embodiments, such as Figure 2 and Figure 5 As shown, a second sealing structure 28 is provided on the end face of the large-diameter end 221 of the inspection cover 22.

[0055] In this embodiment, the large-diameter end 221 of the inspection cover 22 is provided with a second sealing structure 28, see reference. Figure 2 The second sealing structure 28 includes a second sealing groove and a second sealing ring. The second sealing groove is located on the end face of the large-diameter end 221 of the inspection cover 22, and the second sealing ring is disposed in the second sealing groove. When the inspection cover 22 is pressed against the surface of the tube sheet 3 under the reaction force of the longitudinal support beam 12, the second sealing ring is compressed, thus achieving a sealed connection between the inspection cover 22 and the tube sheet 3.

[0056] In some embodiments, such as Figure 5 As shown, the leak detection assembly 2 also includes a pressure gauge 29. The pressure gauge 29 is connected to the main pipe 21.

[0057] In this embodiment, the pressure gauge 29 is connected to the main pipe 21, which can intuitively display the pressure changes in the main pipe 21 and facilitate the observation of leakage.

[0058] In some embodiments, such as Figure 5 As shown, the leak detection assembly 2 also includes a first shut-off valve 211. The first shut-off valve 211 is disposed on the main pipe 21, and the first shut-off valve 211 is located near the end of the main pipe 21 that is away from the positioning core 23.

[0059] In this embodiment, a first shut-off valve 211 is provided at the end of the main pipe 21 that is away from the positioning core 23. During leak detection, it can be used as both the water inlet valve and the drain valve of the heat exchange tube 4, which is convenient for operation.

[0060] In some embodiments, such as Figure 5 As shown, the main pipe 21 is equipped with a backup port 212. The backup port 21 is equipped with a second shut-off valve 213.

[0061] In this embodiment, the main pipe 21 is provided with a backup port 212. The backup port 212 is provided with a second shut-off valve 213 to control the opening and closing of the backup port 212, which is convenient to use and highly flexible.

[0062] This embodiment of the single-tube leak detection device for heat exchanger tube bundles includes connecting brackets 1 mounted on tube sheets 3 at both ends of the tube bundle, and a leak detection component 2 mounted on each connecting bracket 1. The inspection cover 22 is sealed to both ends of the heat exchange tube 4 by tightening the adjusting wheel 25. High-pressure water is introduced into the heat exchange tube 4 through one of the leak detection components 2 to check for leaks. After one heat exchange tube 4 is inspected, the main pipe 21 is moved to inspect the next heat exchange tube 4. The device offers high leak detection efficiency and convenient operation.

[0063] It will be readily understood by those skilled in the art that the aforementioned advantageous methods can be freely combined and superimposed without conflict.

[0064] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model. The above are only preferred embodiments of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of this utility model, and these improvements and modifications should also be considered within the protection scope of this utility model.

Claims

1. A single-tube leak detection device for heat exchanger tube bundles, characterized in that, include: The connecting bracket is detachably mounted on the tube sheet; The leak detection assembly includes a main pipe, an inspection cover, and a positioning core; the main pipe is movably mounted on the connecting bracket; the inspection cover includes a large-diameter end and a small-diameter end; the small-diameter end is connected to the end of the main pipe; the large-diameter end can be sealed to the surface of the tube sheet to enclose the heat exchange tube and the joint weld of the heat exchange tube. The positioning core is disposed in the inspection cover; The positioning core is connected to the main tube; the positioning core is used to be inserted into the heat exchange tube.

2. The single-tube leak detection device for heat exchanger tube bundles according to claim 1, characterized in that, The connecting bracket includes: A connector is detachably mounted on the tube sheet; A pair of transverse guide rails are arranged parallel to each other on the connecting seat; A longitudinal support beam is mounted between a pair of transverse guide rails and is movable along the transverse guide rails; The main pipe is mounted on the longitudinal support beam and is movable along the longitudinal support beam.

3. The single-tube leak detection device for heat exchanger tube bundles according to claim 2, characterized in that, The connector includes: At least two first connecting sleeves, each first connecting sleeve being connected to the tube sheet by a support bolt; at least two first connecting sleeves are coaxially arranged. At least two second connecting sleeves, each second connecting sleeve being connected to the tube sheet by a support bolt; at least two second connecting sleeves are coaxially arranged; the axis of the second connecting sleeve is parallel to the axis of the first connecting sleeve; A first fixed beam is disposed in at least two of the first connecting sleeves; The second fixing beam is disposed in at least two of the second connecting sleeves; The transverse guide rail is installed between the first fixed beam and the second fixed beam.

4. The single-tube leak detection device for heat exchanger tube bundles according to claim 1, characterized in that, The outer wall of the main pipe is provided with external threads; the leak detection assembly further includes: A baffle is movably fitted onto the main pipe; the baffle is located between the connecting bracket and the tube sheet; An adjusting wheel is fitted onto the main pipe and connected to the outer wall of the main pipe via a threaded connection; the adjusting wheel is located on the side of the baffle away from the connecting bracket; By rotating the adjusting wheel, the baffle can be pressed against the connecting bracket; under the reaction force of the connecting bracket, the inspection cover can be pressed against the surface of the tube sheet.

5. The single-tube leak detection device for heat exchanger tube bundles according to claim 1, characterized in that, The leak detection component also includes: A connecting sleeve, one end of which is connected to the main pipe; the end of the connecting sleeve furthest from the main pipe is connected to the small-diameter end of the inspection cover; One end of the positioning core, located inside the inspection cover, passes through the inspection cover and the connecting sleeve in sequence, and is connected to the main tube.

6. The single-tube leak detection device for heat exchanger tube bundles according to claim 5, characterized in that, A first sealing structure is provided between the contact surface of the connecting sleeve and the inspection cover.

7. The single-tube leak detection device for heat exchanger tube bundles according to claim 1, characterized in that, The inspection cover has a second sealing structure on the end face of the large-diameter end.

8. The single-tube leak detection device for heat exchanger tube bundles according to claim 1, characterized in that, The leak detection component also includes: A pressure gauge, which is connected to the main pipe.

9. The single-tube leak detection device for heat exchanger tube bundles according to claim 1, characterized in that, The leak detection component also includes: A first shut-off valve is disposed on the main pipe, and the first shut-off valve is located near the end of the main pipe away from the positioning core.

10. The single-tube leak detection device for heat exchanger tube bundles according to claim 1, characterized in that, The main pipe is equipped with a backup interface; the backup interface is equipped with a second shut-off valve.

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