Pipe head leak detection device

Abstract

The utility model relates to the technical field of heat exchanger maintenance, in particular to a tube head leak detection device which comprises a transparent cover shell, the cover shell is used for covering the welding position of a heat exchange tube and a tube plate, liquid soap is sprayed to the welding position of the heat exchange tube and the tube plate, and an installation cylinder is arranged on the cover shell and used for being inserted into the heat exchange tube. A sealing element for sealing the end part of the heat exchange tube is arranged on the mounting cylinder, a negative pressure assembly for pumping the interior of the housing into negative pressure is arranged on the housing, the sealing element comprises a sealing column arranged on the mounting cylinder, a sealing ring is coaxially arranged on the sealing column, and the sealing ring is used for abutting against the inner side wall of the heat exchange tube. The device has the effect of conveniently detecting whether the heat exchange tube leaks or not.

Description

Technical Field

[0001] The present application relates to the technical field of heat exchanger maintenance, and in particular to a pipe head leak detection device. Background Art

[0002] Heat exchange tubes are an important component of heat exchangers. They are usually located inside the cylinder of the heat exchanger and are responsible for achieving heat exchange between two different fluids. Their main characteristics include high thermal conductivity and good isothermal properties, which enable them to quickly transfer heat energy from one point to another with minimal loss during the transmission process. These characteristics of heat exchange tubes make them widely used in many fields, such as petrochemicals, power systems, heating and heating.

[0003] A heat exchange device is disclosed in the related art, referring to Figure 1 The heat exchange equipment includes a plurality of mutually parallel heat exchange tubes 01, tube sheets 02 are provided at both ends of the heat exchange tubes 01, a cap tube 03 is provided on the side of the tube sheet 02 facing away from the heat exchange tubes 01, a tube box 04 is provided between the two tube sheets 02, and the heat exchange tubes 01 are used to realize heat exchange between the tube box 04 and the cap tubes 03.

[0004] During the manufacturing process of the above-mentioned device, the heat exchange tube needs to be manually welded to the tube sheet. In order to prevent the fluid medium from communicating between the tube box and the cap tube, the welding condition between the tube sheet and the heat exchange tube needs to be leak-checked after the heat exchange tube is welded. The traditional leak detection method is to use a soapy liquid and blow air. By sealing one end of the heat exchange tube as a whole and pressurizing and inflating the other end, observe whether bubbles appear at the welding point between the heat exchange tube and the tube sheet. This method is the most economical and effective method.

[0005] However, due to the structural limitations of various heat exchanger equipment, the ends of some heat exchangers cannot be closed or are inconvenient to be closed, which results in the method of applying soap liquid and pressurizing and inflating being unable to proceed smoothly, and there are shortcomings. Utility Model Content

[0006] In order to improve the problem of inconvenient leak detection at the welding point of the heat exchange tube, the present application provides a tube head leak detection device.

[0007] The present application provides a pipe head leak detection device that adopts the following technical solution:

[0008] A pipe head leak detection device includes a transparent cover shell, the cover shell is used to cover the welding point between the heat exchange tube and the tube sheet, the welding point between the heat exchange tube and the tube sheet is sprayed with soap liquid, the cover shell is provided with a mounting tube, the mounting tube is used to be plugged into the heat exchange tube, the mounting tube is provided with a sealing member for sealing the end of the heat exchange tube, the cover shell is provided with a negative pressure component for evacuating the interior thereof into a negative pressure, the sealing member includes a sealing column arranged on the mounting tube, a sealing ring is coaxially arranged on the sealing column, and the sealing ring is used to press tightly against the inner wall of the heat exchange tube.

[0009] By adopting the above technical solution, the worker first puts the cover on the heat exchange tube, and seals the end of the heat exchange tube that needs to be leak-checked by using a sealing column and a sealing ring. Then, the air between the cover and the tube sheet is evacuated through the negative pressure component. Then, the worker observes through the transparent cover whether bubbles appear at the welding point between the heat exchange tube and the tube sheet. If bubbles appear, it is the leakage location. Then, the cover is removed and repaired, and then leak-check is performed again until no bubbles are generated. The device is convenient for leak detection of a single heat exchange tube, has a simple structure and is easy to operate, has low requirements on the worker's operating proficiency, and is beneficial to improving the production efficiency of the heat exchanger.

[0010] Optionally, the negative pressure component includes a vent seat arranged on the cover shell, the vent seat is provided with a vent slot, the vent slot is used to connect the outside with the inside of the cover shell, an air pump electrically connected to the control system is arranged outside the cover shell, a hose is connected between the air pump and the vent slot of the vent seat, and a sealing member for sealing the vent slot is arranged on the vent seat.

[0011] By adopting the above technical solution, after the worker installs the cover on the heat exchange tube to be inspected, the worker connects the hose to the connecting end of the vent seat, and then the worker starts the vacuum pump through the control system. The vacuum pump extracts the air between the cover and the tube sheet through the hose and the vent groove on the vent seat. Then the worker separates the hose from the vent seat, and at the same time, the sealing piece blocks the vent groove on the vent seat. Finally, the worker only needs to observe the welding point between the tube sheet and the heat exchange tube through the cover.

[0012] Optionally, the sealing member includes a sealing cone, which is used to seal the ventilation slot on the ventilation seat, and a connecting rod parallel to the axis of the ventilation seat is provided on the sealing cone, and there is a spacing between the outer wall of the connecting rod and the inner wall of the ventilation slot, and an anti-slip plate is provided on the connecting rod and located inside the cover shell, and a compression spring is supported between the anti-slip plate and the ventilation seat.

[0013] By adopting the above technical scheme, as the vacuum pump works, the vacuum pump draws out the air in the cover shell through the hose, and under the action of atmospheric pressure, the anti-slip plate squeezes the compression spring, the compression spring shrinks under the force, and the anti-slip plate pushes the blocking cone to separate from the ventilation slot through the connecting rod, and the air in the cover shell is continuously pumped out until the vacuum pump stops working, the compression spring recovers its deformation and pushes the anti-slip plate, and the anti-slip plate drives the blocking cone to block the ventilation slot again through the connecting rod, so that a certain negative pressure is formed between the cover shell and the tube sheet, so as to facilitate the detection of whether there is leakage at the welding point between the heat exchange tube and the tube sheet.

[0014] Optionally, the diameter of the blocking cone gradually decreases along the direction from the blocking cone to the anti-slip plate.

[0015] The adoption of the above technical solution is helpful to improve the sealing effect of the sealing cone on the ventilation slot on the air seat.

[0016] Optionally, a sealing sleeve is provided at the open end of the cover shell, and the sealing sleeve is used to abut against the tube sheet.

[0017] By adopting the above technical solution, it is beneficial to improve the sealing between the cover shell and the tube sheet, and it is beneficial to improve the reliability of the detection result.

[0018] Optionally, a mounting column is provided on the mounting cylinder, and the sealing column is detachably arranged on the mounting column.

[0019] By adopting the above technical solution, it is easy to replace sealing columns of different diameters, thereby adapting to heat exchange tubes of different diameters, which is beneficial to improving the application range of the device.

[0020] Optionally, the mounting tube is coaxially arranged on the cover shell, the interior of the mounting tube is hollow and one end is open, the open end of the mounting tube is covered on the vent seat, and a pressure port is opened between the inner and outer side walls of the mounting tube.

[0021] By adopting the above technical solution, the cover shell can completely cover the welding point between the tube sheet and the heat exchange tube, which is helpful to improve the accuracy of the detection result of whether the heat exchange tube is leaking.

[0022] Optionally, a pull rod is provided on the end of the blocking cone facing away from the connecting rod.

[0023] By adopting the above technical solution, when a worker needs to disassemble the cover, the worker pulls the pull rod, and the pull rod drives the sealing cone to separate from the ventilation groove. The sealing cone drives the anti-slip plate to squeeze the compression spring through the connecting rod. The compression spring contracts under the force, and the outside air enters the cover through the ventilation groove, balancing the air pressure in the cover, which is convenient for the worker to remove the cover.

[0024] Optionally, a guide cone is coaxially arranged on one end of the sealing column facing the heat exchange tube, and the diameter of the guide cone gradually decreases in a direction away from the sealing column.

[0025] By adopting the above technical solution, it is convenient for workers to insert the sealing column into the heat exchange tube through the guide cone, which is conducive to improving the convenience of workers in installing the cover.

[0026] In summary, the present application includes at least one of the following beneficial technical effects:

[0027] 1. The worker first puts the cover on the heat exchange tube, and seals the end of the heat exchange tube that needs to be leak-checked with a sealing column and a sealing ring. Then, the air between the cover and the tube sheet is extracted through the negative pressure component. Then, the worker observes whether bubbles appear at the welding point between the heat exchange tube and the tube sheet through the transparent cover. If there are bubbles, it is the leakage position. Then, the cover is removed and repaired, and then leak-check is performed again until no bubbles are generated. This device is convenient for leak-checking a single heat exchange tube, has a simple structure and is easy to operate. It requires low operator proficiency and is conducive to improving the production efficiency of the heat exchanger.

[0028] 2. After the worker installs the cover on the heat exchange tube to be tested, the worker connects the hose to the connection end of the vent seat, and then starts the vacuum pump through the control system. The vacuum pump extracts the air between the cover and the tube sheet through the hose and the vent slot on the vent seat. Then the worker separates the hose from the vent seat, and at the same time, the sealing piece blocks the vent slot on the vent seat. Finally, the worker only needs to observe the welding point between the tube sheet and the heat exchange tube through the cover;

[0029] 3. As the vacuum pump works, it draws out the air in the cover shell through the hose. Under the action of atmospheric pressure, the anti-drop plate squeezes the compression spring, and the compression spring shrinks under the force. The anti-drop plate pushes the blocking cone to separate from the ventilation slot through the connecting rod, and the air in the cover shell is continuously drawn out until the vacuum pump stops working. The compression spring recovers its deformation and pushes the anti-drop plate. The anti-drop plate drives the blocking cone to block the ventilation slot again through the connecting rod, so that a certain negative pressure is formed between the cover shell and the tube sheet, so as to detect whether there is leakage at the welding point between the heat exchange tube and the tube sheet. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a structural diagram in the background technology.

[0031] Figure 2 It is a schematic diagram of the structure of an embodiment of the present application.

[0032] Figure 3 It is a structural schematic diagram of the positional relationship among the cover shell, the sealing column and the vent seat in the embodiment of the present application.

[0033] Figure 4 It is a cross-sectional view showing the positional relationship among the cover shell, the mounting tube and the mounting column in the embodiment of the present application.

[0034] Explanation of the reference numerals in the accompanying drawings: 01, heat exchange tube; 02, tube sheet; 03, cap tube; 04, tube box; 1, cover shell; 2, mounting tube; 3, sealing member; 31, sealing column; 32, sealing ring; 4, negative pressure assembly; 41, vent seat; 42, vent slot; 43, vacuum pump; 44, hose; 45, plugging member; 451, plugging cone; 452, connecting rod; 453, anti-slip plate; 454, compression spring; 5, sealing sleeve; 6, mounting column; 7, pressure port; 8, pull rod; 9, guide cone. DETAILED DESCRIPTION

[0035] The following is combined with Figure 2-4 This application is described in further detail.

[0036] The embodiment of the present application discloses a pipe head leak detection device.

[0037] Reference Figure 2 A pipe head leak detection device includes a transparent cover shell 1, which can be made of highly transparent acrylic material in the prior art. The cover shell 1 is used to cover the welding point between the heat exchange tube 01 and the tube sheet 02. The open end of the cover shell 1 is clamped with a sealing sleeve 5, which is used to abut against the tube sheet 02. The welding point between the heat exchange tube 01 and the tube sheet 02 is sprayed with soap liquid. A mounting tube 2 with a hollow interior and an open end is coaxially welded in the cover shell 1. The open end of the mounting tube 2 is connected to the cover shell 1, and a plurality of pressure ports 7 are opened between the inner and outer side walls of the mounting tube 2.

[0038] Reference Figure 2 , Figure 3 and Figure 4 The mounting tube 2 is used to be inserted into the heat exchange tube 01. A mounting column 6 is welded to one end of the mounting tube 2 which is away from the cover shell 1. A sealing member 3 for sealing the end of the heat exchange tube 01 is arranged on the mounting tube 2. The sealing member 3 includes a sealing column 31 which is threadedly connected to the mounting column 6. The sealing column 31 is made of silicone material in the prior art.

[0039] Reference Figure 2 , Figure 3 and Figure 4 A plurality of sealing rings 32 are integrally formed on the sealing column 31, and the plurality of sealing rings 32 are evenly arranged along the axial direction of the sealing column 31. The sealing rings 32 are used to press against the inner wall of the heat exchange tube 01. A guide cone 9 is coaxially bonded to one end of the sealing column 31 facing the heat exchange tube 01, and the diameter of the guide cone 9 gradually decreases in the direction away from the sealing column 31. A negative pressure component 4 for pumping negative pressure inside the cover 1 is arranged.

[0040] The worker first covers the cover 1 on the heat exchange tube 01, inserts the sealing column 31 into the heat exchange tube 01 through the guide cone 9, and at the same time blocks the end of the heat exchange tube 01 by relying on the flexibility of the sealing column 31 and the sealing ring 32. Then the worker presses the cover 1 to make the sealing sleeve 5 on the cover 1 press against the outer wall of the tube sheet 02.

[0041] Reference Figure 2 , Figure 3 and Figure 4 The negative pressure assembly 4 includes a vent seat 41 detachably arranged on the cover shell 1. The vent seat 41 is made of flexible materials such as silicone. The vent seat 41 is coaxially arranged with the cover shell 1. The open end of the mounting tube 2 is covered outside the vent seat 41. A vent slot 42 is coaxially opened on the vent seat 41. The vent slot 42 is used to connect the outside with the inside of the cover shell 1. An air pump 43 electrically connected to the control system is arranged outside the cover shell 1. A hose 44 is connected between the air pump 43 and the vent slot 42 of the vent seat 41.

[0042] Reference Figure 2 , Figure 3 and Figure 4 A sealing piece 45 for sealing the ventilation slot 42 is arranged on the ventilation seat 41, and the sealing piece 45 includes a sealing cone 451, and the sealing cone 451 is used to seal the ventilation slot 42 on the ventilation seat 41. A connecting rod 452 coaxial with the ventilation seat 41 is welded on the sealing cone 451, and there is a distance between the outer wall of the connecting rod 452 and the inner wall of the ventilation slot 42.

[0043] Reference Figure 2 , Figure 3 and Figure 4 An anti-slip plate 453 is welded on the connecting rod 452 and located inside the cover shell 1, a compression spring 454 is supported between the anti-slip plate 453 and the vent seat 41, the diameter of the blocking cone 451 gradually decreases along the direction from the blocking cone 451 to the anti-slip plate 453, and a pull rod 8 is welded on the end of the blocking cone 451 that is away from the connecting rod 452.

[0044] The worker connects the hose 44 on the vacuum pump 43 to the vent seat 41, and then starts the vacuum pump 43 through the control system. The vacuum pump 43 causes the air pressure on the side of the sealing cone 451 close to the hose 44 to drop. Under the action of atmospheric pressure, the anti-slip plate 453 squeezes the compression spring 454, and the compression spring 454 shrinks under the force. The anti-slip plate 453 pushes the sealing cone 451 to separate from the vent slot 42 through the connecting rod 452, and the air between the cover shell 1 and the tube sheet 02 is continuously evacuated.

[0045] After a period of time, the vacuum pump 43 stops working, the compression spring 454 recovers its deformation and pushes the anti-slip plate 453, and the anti-slip plate 453 drives the sealing cone 451 through the connecting rod 452 to re-block the ventilation slot 42, thereby forming a certain negative pressure between the cover shell 1 and the tube sheet 02. The worker removes the hose 44 and observes through the cover shell 1 whether bubbles are generated at the welding point between the tube sheet 02 and the heat exchange tube 01.

[0046] If bubbles are generated, the worker pulls the pull rod 8, and the pull rod 8 drives the sealing cone 451 to separate from the ventilation groove 42. The sealing cone 451 drives the anti-slip plate 453 to squeeze the compression spring 454 through the connecting rod 452. The compression spring 454 shrinks under the force, and the outside air enters the cover shell 1 through the ventilation groove 42. The worker removes the cover shell 1 and cleans the soap liquid, then re-welds it, and then repeats the above leak detection operation process until no bubbles are generated at the welding point between the tube sheet 02 and the heat exchange tube 01.

[0047] The implementation principle of a pipe head leak detection device in an embodiment of the present application is as follows: a worker first covers the cover shell 1 on the heat exchange tube 01, inserts the sealing column 31 into the heat exchange tube 01 through the guide cone 9, and at the same time relies on the flexibility of the sealing column 31 and the sealing ring 32 to block the end of the pipe mouth of the heat exchange tube 01, and then the worker presses the cover shell 1 to make the sealing sleeve 5 on the cover shell 1 press against the outer wall of the tube sheet 02.

[0048] The worker connects the hose 44 on the vacuum pump 43 to the vent seat 41, and then starts the vacuum pump 43 through the control system. The vacuum pump 43 causes the air pressure on the side of the sealing cone 451 close to the hose 44 to drop. Under the action of atmospheric pressure, the anti-slip plate 453 squeezes the compression spring 454, and the compression spring 454 shrinks under the force. The anti-slip plate 453 pushes the sealing cone 451 to separate from the vent slot 42 through the connecting rod 452, and the air between the cover shell 1 and the tube sheet 02 is continuously evacuated.

[0049] After a period of time, the vacuum pump 43 stops working, the compression spring 454 recovers its deformation and pushes the anti-slip plate 453, and the anti-slip plate 453 drives the sealing cone 451 through the connecting rod 452 to re-block the ventilation slot 42, thereby forming a certain negative pressure between the cover shell 1 and the tube sheet 02. The worker removes the hose 44 and observes through the cover shell 1 whether bubbles are generated at the welding point between the tube sheet 02 and the heat exchange tube 01.

[0050] If bubbles are generated, the worker pulls the pull rod 8, and the pull rod 8 drives the sealing cone 451 to separate from the ventilation groove 42. The sealing cone 451 drives the anti-slip plate 453 to squeeze the compression spring 454 through the connecting rod 452. The compression spring 454 shrinks under the force, and the outside air enters the cover shell 1 through the ventilation groove 42. The worker removes the cover shell 1 and cleans the soap liquid, then re-welds it, and then repeats the above leak detection operation process until no bubbles are generated at the welding point between the tube sheet 02 and the heat exchange tube 01.

[0051] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A pipe head leak detection device, characterized in that: The invention comprises a transparent cover shell (1), wherein the cover shell (1) is used to cover the welding point between the heat exchange tube (01) and the tube sheet (02), wherein the welding point between the heat exchange tube (01) and the tube sheet (02) is sprayed with soap liquid, wherein the cover shell (1) is provided with a mounting tube (2), wherein the mounting tube (2) is used to be plugged into the heat exchange tube (01), wherein the mounting tube (2) is provided with a sealing member (3) for sealing the end of the heat exchange tube (01), wherein the cover shell (1) is provided with a negative pressure assembly (4) for evacuating the interior thereof to a negative pressure, wherein the sealing member (3) comprises a sealing column (31) provided on the mounting tube (2), wherein a sealing ring (32) is coaxially provided on the sealing column (31), wherein the sealing ring (32) is used to press against the inner wall of the heat exchange tube (01).

2. A pipe head leak detection device according to claim 1, characterized in that: The negative pressure component (4) comprises a vent seat (41) arranged on the cover shell (1), a vent slot (42) being provided on the vent seat (41), the vent slot (42) being used to connect the outside with the inside of the cover shell (1), an air pump (43) electrically connected to the control system being provided outside the cover shell (1), a hose (44) being connected between the air pump (43) and the vent slot (42) of the vent seat (41), and a blocking member (45) for blocking the vent slot (42) being provided on the vent seat (41).

3. A pipe head leak detection device according to claim 2, characterized in that: The blocking member (45) comprises a blocking cone (451), and the blocking cone (451) is used to block the ventilation slot (42) on the ventilation seat (41); a connecting rod (452) parallel to the axis of the ventilation seat (41) is provided on the blocking cone (451); there is a distance between the outer wall of the connecting rod (452) and the inner wall of the ventilation slot (42); an anti-slip plate (453) is provided on the connecting rod (452) and located inside the cover (1); a compression spring (454) is supported between the anti-slip plate (453) and the ventilation seat (41).

4. A pipe head leak detection device according to claim 3, characterized in that: The diameter of the blocking cone (451) gradually decreases along the direction from the blocking cone (451) to the anti-slip plate (453).

5. A pipe head leak detection device according to claim 1, characterized in that: The open end of the cover shell (1) is provided with a sealing sleeve (5), and the sealing sleeve (5) is used to abut against the tube sheet (02).

6. A pipe head leak detection device according to claim 1, characterized in that: The installation cylinder (2) is provided with an installation column (6), and the sealing column (31) is detachably arranged on the installation column (6).

7. A pipe head leak detection device according to claim 1, characterized in that: The mounting tube (2) is coaxially arranged on the housing (1); the mounting tube (2) is hollow inside and open at one end; the open end of the mounting tube (2) is covered on the vent seat (41); and a pressure port (7) is opened between the inner and outer side walls of the mounting tube (2).

8. A pipe head leak detection device according to claim 3, characterized in that: A pull rod (8) is provided on one end of the blocking cone (451) that faces away from the connecting rod (452).

9. A pipe head leak detection device according to claim 1, characterized in that: A guide cone (9) is coaxially arranged on one end of the sealing column (31) facing the heat exchange tube (01), and the diameter of the guide cone (9) gradually decreases in a direction away from the sealing column (31).

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