Top-reduced heat exchanger capable of detecting leakage of welding seam of heat exchange tube and tube plate

Abstract

The utility model relates to a top-reduced heat exchanger capable of detecting leakage of weld joints of heat exchange tubes and a tube plate, which belongs to the technical field of heat exchangers and comprises a barrel, a plurality of heat exchange tubes are transversely arranged in the barrel, a seal head is arranged at one end of the barrel, a corrugated tube is embedded at the other end of the barrel and fixedly connected with the inner wall of the barrel in a welding manner, and the tube plate is fixedly connected with the inner wall of the barrel. A core rear tube plate is arranged at the end of the heat exchange tube, the heat exchange tube is fixedly connected with the core rear tube plate, a core rear tube box is arranged on one side of the core rear tube plate, and the core rear tube box is connected with a core rear tube plate flange. When the heat exchanger provided by the utility model is used for leak detection, whether the shell pass and the tube pass leak or not can be simultaneously detected only by dismounting the front end socket and the core rear tube box, connecting the core rear tube plate and the barrel flange by using the end face sealing bolt, blocking the inner ring threaded hole on the core rear tube plate by using the screwed plug, enabling the welded junctions of the heat exchange tube and the tube plate to face outwards and injecting water into the shell pass; the specific leakage position can be visually found, and the leakage detection efficiency of the heat exchanger is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of heat exchangers, and in particular relates to a reduced-top heat exchanger capable of detecting leakage of welds between heat exchange tubes and tube sheets. Background Art

[0002] In the cooling system of a vacuum pump unit, the heat exchanger is a key component, and the reliability of its performance is of paramount importance. The traditional method for inspecting the welds between heat exchange tubes and tube sheets for leaks is to face the welds between the heat exchange tubes and the front and rear tube sheets outward, and then inject water or air from the shell side. However, due to the 2mm gap between the outer diameter of the rear end tube sheet and the inner wall of the shell side of the heat exchanger core, a passage is formed, making it impossible to maintain pressure, which makes this method very limited in actual operation. In addition, the inspection process of this method is complicated, inefficient, and prone to damage to the equipment. Therefore, there is an urgent need to design a heat exchanger that can easily detect the leakage performance of the welds between heat exchange tubes and tube sheets. Utility Model Content

[0003] In order to overcome the defects of the prior art, the purpose of the present invention is to provide a reduced-top heat exchanger capable of detecting leakage of heat exchange tubes and tube sheet welds, so as to solve the technical problem of inconvenience in use in the prior art.

[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0005] A reduced-top heat exchanger capable of detecting leakage of welds between heat exchange tubes and tube sheets comprises a cylinder, wherein a plurality of heat exchange tubes are transversely arranged inside the cylinder, a head is provided at one end of the cylinder, a bellows is embedded at the other end of the cylinder, the bellows is welded and fixedly connected to the inner wall of the cylinder, a core rear tube sheet is provided at the end of the heat exchange tube, the heat exchange tube is fixedly connected to the core rear tube sheet, a core rear tube box is provided on one side of the core rear tube sheet, and the core rear tube box is flange-connected to the core rear tube sheet.

[0006] Preferably, the core rear tube box includes an end shell and a core rear flange, the end shell is fixedly connected to the core rear flange, the bellows is fixedly connected to the core rear flange, and the core rear flange is fixedly connected to the core rear tube plate.

[0007] Preferably, a support tube is fixedly provided on one side of the core rear tube plate, the support tube is embedded in the cylinder, and the corrugated tube is provided between the support tube and the cylinder.

[0008] Preferably, end face sealing bolts are provided between the core rear tube plate and the core rear flange, and the end face sealing bolts are used to fix the core rear tube plate and the core rear flange.

[0009] Preferably, the cylinder is provided with a flange inlet and a flange outlet, and the flange inlet and the flange outlet are respectively connected with the inner cavity of the cylinder.

[0010] Preferably, a cooling inlet and a cooling outlet are provided on the head, and a partition is provided between the cooling inlet and the cooling outlet.

[0011] Preferably, the heat exchange tube passes through the tube sheet behind the core, and the heat exchange tube is fixedly connected to the end face of the tube sheet behind the core by welding.

[0012] Preferably, the distance between the support tube and the cylinder is 2 mm to 5 mm.

[0013] Compared with the prior art, the beneficial effects of the present invention are:

[0014] The utility model provides a reduced-top heat exchanger capable of detecting leakage of welds of heat exchange tubes and tube sheets. When detecting leakage of the heat exchanger of the utility model, it is only necessary to remove the front end head and the core rear tube box, use end face sealing bolts to connect the core rear tube sheet and the cylinder flange, use wire plugs to block the inner circle threaded holes on the core rear tube sheet, let the welds of the heat exchange tubes and tube sheets face outward, and inject water into the shell side. Then, it is possible to simultaneously detect whether the shell side and the tube side are leaking, and the specific leakage location can also be visually found, thereby improving the leakage detection efficiency of the heat exchanger. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of the prior art device;

[0016] Figure 2 This is a schematic diagram of the structure of the device of the utility model;

[0017] Figure 3 This is a schematic diagram of the cross-sectional structure of the device of the utility model as viewed along the AA line;

[0018] Figure 4 This is an enlarged structural diagram of location B of the device of the present invention.

[0019] In the figure: 1. Cylinder, 2. Front cover, 3. Rear cover, 4. Rotor, 5. Gear, 6. Heat exchange tube, 7. Bellows, 8. Core rear tube plate, 9. Support tube, 10. End shell, 11. Core rear flange, 12. Cooling inlet, 13. Cooling outlet, 14. Partition, 15. End face sealing bolt, 18. Support, 19. Primary pump body, 20. Secondary pump body, 21. Spacer, 22. Connecting pipe. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0021] Example 1

[0022] like Figure 1The diagram below shows the structure of a conventional heat exchanger. To inspect the welds between the heat exchange tubes and tubesheets for leaks, the welds between the tubes and the front and rear tubesheets must be facing outward, and water or air must be injected from the shell side. Because there is a 2mm gap between the outer diameter of the rear tubesheet and the inner wall of the shell side of the heat exchanger core, creating a passageway and preventing pressure maintenance, the welds between the heat exchange tubes and tubesheets cannot be inspected.

[0023] like Figures 2 to 4 As shown, the utility model provides a reduced-top heat exchanger capable of detecting leakage in welds of heat exchange tubes and tube sheets, comprising a cylinder 1, wherein a plurality of heat exchange tubes 6 are transversely arranged in the cylinder 1, a head 3 is provided at one end of the cylinder 1, a bellows 7 is embedded at the other end of the cylinder 1, and the bellows 7 is welded and fixedly connected to the inner wall of the cylinder 1, a core rear tube sheet 8 is provided at the end of the heat exchange tube 6, the heat exchange tube 6 is fixedly connected to the core rear tube sheet 8, a core rear tube box 2 is provided on one side of the core rear tube sheet 8, and the core rear tube box 2 is flange-connected to the core rear tube sheet 8. The two circles of the core rear tube sheet 8 are threaded connections, the external threaded hole is flange-connected to the cylinder 1, and the internal threaded hole is flange-connected to the core rear tube box 2. During assembly of the present invention, a sealing gasket is placed between the tube core and the front flange of the cylinder body 1. The tube core is moved inward. When the rear tube sheet of the tube core is approximately 100 mm from the rear flange of the cylinder body, a sealing gasket is placed between the rear tube sheet 8 of the core and the rear flange of the cylinder body 1. First, the front tube sheet of the core is brought into close contact with the front flange of the shell side. The sealing gasket is then placed and installed on the front tube box. Finally, the rear tube sheet of the core is connected to the rear flange of the shell side. Due to the expansion and contraction of the bellows, this gap can be adjusted as needed, ensuring a tight connection between the front and rear tube sheets 8 of the core and the front and rear flanges of the shell side. The connection between the rear tube box 2 of the core and the rear flange of the core remains unchanged. In particular, the connecting bolts must be end-face sealing bolts.

[0024] When detecting leaks in the device of the present invention, it is only necessary to remove the front tube box and the core rear tube box 2, connect the core front tube sheet and the cylinder front flange, use end face sealing bolts to connect the core rear tube sheet 8 and the cylinder rear flange, use wire plugs to block the inner circle threaded holes on the core rear tube sheet 8, let the welds of the heat exchange tubes and the tube sheet face outward, and inject water into the shell side. This can simultaneously detect whether the shell side and the tube side are leaking, and can also visually find the specific leak location.

[0025] The rear core tube box 2 includes an end shell 10 and a rear core flange 11. The end shell 10 is fixedly connected to the rear core flange 11. The bellows 7 is fixedly connected to the rear core flange 11. The rear core flange 11 is fixedly connected to the rear core tube sheet 8. Compared with the prior art, the embodiment of the utility model eliminates one head shell and also implements shell-side and tube-side leakage detection.

[0026] A support tube 9 is fixedly provided on one side of the core rear tube plate 8, and the support tube 9 is embedded in the cylinder 1, and the corrugated tube 7 is arranged between the support tube 9 and the cylinder 1. The support tube 9 is welded to the core rear tube plate 8 to prevent the rear end of the flexible corrugated tube 7 from sagging.

[0027] End face sealing bolts 15 are provided between the core rear tube sheet 8 and the core rear flange 11. The end face sealing bolts 15 are used to securely connect the core rear tube sheet 8 and the core rear flange 11. The end face sealing bolts 15 are used to securely connect the core rear tube sheet 8 and, when testing the heat exchanger, to seal the threaded holes on the core rear tube sheet 8 and the core rear flange to prevent pressure release from the threaded holes during testing.

[0028] The cylinder 1 is provided with a flange inlet 4 and a flange outlet 5 , and the flange inlet 4 and the flange outlet 5 are respectively connected to the inner cavity of the cylinder 1 .

[0029] The head 3 is provided with a cooling inlet 12 and a cooling outlet 13 , and a partition 14 is provided between the cooling inlet 12 and the cooling outlet 13 .

[0030] The heat exchange tube 6 passes through the core rear tube plate 8, and the heat exchange tube 6 is fixedly connected to the end surface of the core rear tube plate 8 by welding.

[0031] The distance between the support tube 9 and the cylinder 1 is 2 mm to 5 mm.

[0032] Of course, the above embodiments are not intended to limit the present invention, and the present invention is not limited to the above examples. Any changes, modifications, additions or substitutions made by technicians in this technical field within the essential scope of the present invention should also fall within the scope of protection of the present invention.

Claims

1. A reduced-top heat exchanger capable of detecting leakage of heat exchange tube and tube sheet welds, comprising a cylinder (1), Its characteristics are: A plurality of heat exchange tubes (6) are transversely arranged in the cylinder (1), a head (3) is provided at one end of the cylinder (1), a bellows (7) is embedded at the other end of the cylinder (1), the bellows (7) is fixedly connected to the inner wall of the cylinder (1) by welding, a core rear tube sheet (8) is provided at the end of the heat exchange tube (6), the heat exchange tube (6) is fixedly connected to the core rear tube sheet (8), a core rear tube box (2) is provided on one side of the core rear tube sheet (8), and the core rear tube box (2) is flange-connected to the core rear tube sheet (8).

2. A reduced-top heat exchanger capable of detecting leakage of heat exchange tube and tube sheet welds according to claim 1, characterized in that: The core rear tube box (2) comprises an end shell (10) and a core rear flange (11); the end shell (10) is fixedly connected to the core rear flange (11); the bellows (7) is fixedly connected to the core rear flange (11); and the core rear flange (11) is fixedly connected to the core rear tube plate (8).

3. The reduced-top heat exchanger capable of detecting leakage of heat exchange tube and tube sheet welds according to claim 2, characterized in that: A support tube (9) is fixedly provided on one side of the core rear tube plate (8), the support tube (9) is embedded in the cylinder (1), and the corrugated tube (7) is provided between the support tube (9) and the cylinder (1).

4. The reduced-top heat exchanger capable of detecting leakage of heat exchange tube and tube sheet welds according to claim 2, characterized in that: An end face sealing bolt (15) is provided between the core rear tube plate (8) and the core rear flange (11), and the end face sealing bolt (15) is used for fixedly connecting the core rear tube plate (8) and the core rear flange (11).

5. The reduced-top heat exchanger capable of detecting leakage of heat exchange tube and tube sheet welds according to claim 1, characterized in that: The cylinder (1) is provided with a flange inlet (4) and a flange outlet (5), and the flange inlet (4) and the flange outlet (5) are respectively connected to the inner cavity of the cylinder (1).

6. The reduced-top heat exchanger capable of detecting leakage of heat exchange tube and tube sheet welds according to claim 1, characterized in that: The sealing head (3) is provided with a cooling inlet (12) and a cooling outlet (13), and a partition (14) is provided between the cooling inlet (12) and the cooling outlet (13).

7. The reduced-top heat exchanger capable of detecting leakage of heat exchange tube and tube sheet welds according to claim 1, characterized in that: The heat exchange tube (6) passes through the core rear tube plate (8), and the heat exchange tube (6) is fixedly connected to the end surface of the core rear tube plate (8) by welding.

8. The reduced-top heat exchanger capable of detecting leakage of heat exchange tube and tube sheet welds according to claim 3, characterized in that: The distance between the support tube (9) and the cylinder (1) is 2 mm to 5 mm.

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