U-shaped tube type double-tube-plate tube bundle with isolation section

Abstract

The U-shaped tube type double-tube-plate tube bundle with the isolation section comprises an outer tube plate, an isolation section barrel, an inner tube plate, a pull rod, a baffle plate, a pipe spacer, a U-shaped heat exchange tube set, a nut and a supporting plate, the isolation section barrel is fixedly installed between the outer tube plate and the inner tube plate, through holes are formed in the surface of the outer tube plate and the surface of the inner tube plate, and the outer tube plate and the inner tube plate are fixedly connected through the pull rod. And the through holes in the outer tube plate and the inner tube plate are arranged in the same way. According to the U-shaped tube type double-tube-plate tube bundle with the isolation sections, an outer tube plate and a U-shaped heat exchange tube set of the U-shaped tube type double-tube-plate tube bundle with the isolation sections are connected through a strength welding and attaching expansion method, an inner tube plate and the U-shaped heat exchange tube set are connected through a hydraulic strength expansion method, and a section of isolation barrel is arranged between the outer tube plate and the inner tube plate. And an independent cavity is formed, so that the corrosion influence of a shell pass medium on a pipe end welding seam can be effectively prevented, and dangers such as explosion caused by mixing of pipe and shell pass materials are avoided.

Description

Technical Field

[0001] This utility model relates to the field of high-efficiency and energy-saving technology of shell and tube heat exchangers, and in particular to a U-shaped tube double tube sheet bundle with an isolation section. Background Technology

[0002] U-tube heat exchangers are widely used in industries such as petroleum, chemical, and energy. Existing U-tube heat exchanger designs primarily employ a single tube sheet configuration. This structure offers advantages such as ease of manufacturing and maintenance. However, the connection between the heat exchange tubes and the tube sheet is a weak point requiring special attention. To extend the tube bundle's service life, it is necessary to improve the quality of this connection or implement effective protective measures. In a double tube sheet structure, the connection between the inner tube sheet and the heat exchange tubes typically uses a mechanically expanded structure. This requires drilling small holes, slightly smaller than the finished boreholes, according to the tube layout diagram on the inner tube sheet. After heat treatment to increase hardness, the finished boreholes are then drilled. This process is inconvenient for CNC machining, resulting in low dimensional accuracy. Furthermore, the tube ends usually require annealing to reduce hardness and ensure a better connection due to the difference in hardness. This process is cumbersome, has a long production cycle, and increases costs. Therefore, we propose a U-tube double tube sheet bundle with an isolation section. Utility Model Content

[0003] The main objective of this invention is to provide a U-shaped tube double tube sheet bundle with an isolation section, which can effectively solve the problems in the background art.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0005] A U-shaped tube double tube sheet bundle with an isolation section includes an outer tube sheet, an isolation section cylinder, an inner tube sheet, a tie rod, a baffle plate, a spacer tube, a U-shaped heat exchange tube assembly, a nut, and a support plate. The isolation section cylinder is fixedly installed between the outer tube sheet and the inner tube sheet. Both the outer tube sheet and the inner tube sheet have through holes on their surfaces, and the through holes on the outer tube sheet and the inner tube sheet are arranged in the same order. The U-shaped heat exchange tube assembly passes through the through holes on the outer tube sheet and the inner tube sheet and is fixedly connected. A tie rod is spirally connected to one side surface of the inner tube sheet.

[0006] Preferably, the surfaces of the baffle plate and the support plate are provided with through holes and positioning holes. The tie rod and the U-shaped heat exchange tube assembly pass through the through holes through the baffle plate and the support plate. There are multiple baffle plates. The multiple baffle plates pass through the positioning holes through the positioning tubes and are controlled by nuts.

[0007] Preferably, the edges of the baffle and the support plate are provided with slides.

[0008] Preferably, the surface of the isolation section cylinder is welded with a long neck flange, and two long neck flanges are provided.

[0009] Preferably, the inner surface of the through hole of the inner tube sheet is provided with an expansion groove, and the surface of the U-shaped heat exchange tube group is provided with a first expansion tube and a second expansion tube respectively located inside the through hole of the inner tube sheet and the outer tube sheet. The surface of the first expansion tube is also provided with a secondary expansion tube, and the secondary expansion tube expands and embeds into the expansion groove for sealing connection.

[0010] Preferably, the expansion groove has a width of 9mm and a depth of 0.5mm, and multiple tie rods and U-shaped heat exchange tube assemblies are provided as needed.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] In this invention, the outer tube sheet and the U-shaped heat exchange tube assembly of the U-shaped tube bundle with isolation section are connected by strength welding and expansion bonding, and the inner tube sheet and the U-shaped heat exchange tube assembly are connected by hydraulic strength expansion bonding. There is an isolation cylinder between the outer tube sheet and the inner tube sheet, forming an independent cavity, which can effectively prevent the shell-side medium from corroding the weld seam at the tube end and avoid the danger of explosion caused by mixing of tube and shell-side materials. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of a U-shaped tube double tube sheet bundle with an isolation section according to the present invention.

[0014] Figure 2 This is a schematic diagram of the connection joint between the outer tube sheet and the U-shaped heat exchange tube assembly of a U-shaped tube double tube sheet bundle with an isolation section according to this utility model.

[0015] Figure 3 This is a schematic diagram of the connection joint between the inner tube sheet and the U-shaped heat exchange tube assembly of a U-shaped tube double tube sheet bundle with an isolation section according to this utility model.

[0016] In the diagram: 1. Outer tube sheet; 2. Isolation section cylinder; 3. Inner tube sheet; 301. Expansion groove; 4. Tie rod; 5. Baffle plate; 6. Spacing tube; 7. U-shaped heat exchanger tube assembly; 701. First expansion tube; 702. Second expansion tube; 703. Second expansion tube; 8. Nut; 9. Support plate; 10. Slide rail; 11. Long neck flange. Detailed Implementation

[0017] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0018] like Figure 1-3As shown, a U-shaped tube double tube sheet bundle with an isolation section includes an outer tube sheet 1, an isolation section cylinder 2, an inner tube sheet 3, a tie rod 4, a baffle plate 5, a spacer tube 6, a U-shaped heat exchange tube assembly 7, a nut 8, and a support plate 9. The isolation section cylinder 2 is fixedly installed between the outer tube sheet 1 and the inner tube sheet 3. Through holes are opened on the surfaces of both the outer tube sheet 1 and the inner tube sheet 3, and the through holes on the outer tube sheet 1 and the inner tube sheet 3 are arranged in the same way. The U-shaped heat exchange tube assembly 7 passes through the through holes on the outer tube sheet 1 and the inner tube sheet 3 and is fixedly connected. A tie rod 4 is spirally connected to one side surface of the inner tube sheet 3.

[0019] The surfaces of the baffle plate 5 and support plate 9 are provided with through holes and positioning holes. The tie rod 4 and the U-shaped heat exchange tube assembly 7 pass through the through holes through the baffle plate 5 and support plate 9. There are multiple baffle plates 5. The multiple baffle plates 5 pass through the positioning holes through the spacer tubes 6 and are controlled by nuts 8. The edges of the baffle plate 5 and support plate 9 are provided with slide rails 10. The edges of the baffle plate 5 and support plate 9 are provided with grooves for installing the slide rails 10. The slide rails 10 are welded to them to strengthen the stability of the tube bundle and reduce the damage to the U-shaped heat exchange tube assembly 7 and the joint with the tube sheet caused by vibration during equipment operation. The surface of the isolation section cylinder 2 is welded with two long and high neck flanges 11. The inner surface of the through hole of the tube sheet 3 is provided with an expansion groove 301. The surface of the U-shaped heat exchange tube assembly 7 is provided with a first expansion tube 701 and a second expansion tube 703 located inside the through hole of the inner tube sheet 3 and the outer tube sheet 1, respectively. The surface of the first expansion tube 701 is also provided with a secondary expansion tube 702, and the secondary expansion tube 702 expands and embeds into the expansion groove 301 for sealing connection. The expansion groove 301 is 9mm wide and 0.5mm deep. When the tube sheet thickness is sufficient (≥50mm), double expansion grooves 301 can be opened, and the distance between the two expansion grooves 301 is 6mm. This can better ensure the connection strength and sealing performance of the joint. The tie rod 4 and the U-shaped heat exchange tube assembly 7 are provided in multiple quantities as needed.

[0020] It should be noted that this utility model is a U-shaped tube double tube sheet bundle with an isolation section. In use, the two long and high neck flanges 11 serve as vent and condensate discharge ports, respectively, so that the leakage of the U-shaped heat exchange tube bundle 7 and the inner tube sheet 3 joint can be discharged in time, reducing the corrosion and damage of the shell-side medium to the weld between the U-shaped heat exchange tube bundle 7 and the outer tube sheet 1, and effectively preventing the shell-side medium from contacting the tube. After the tube bundle is manufactured, water can be filled into the isolation section cylinder 2 through the long and high neck flanges 11 to conduct a hydrostatic test, and at the same time check the quality of the connection joint between the U-shaped heat exchange tube bundle 7 and the inner tube sheet 3 and the outer tube sheet 1.

[0021] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A U-shaped tube double tube sheet bundle with an isolation section, characterized in that: The system includes an outer tube sheet (1), an isolation section cylinder (2), an inner tube sheet (3), a tie rod (4), a baffle plate (5), a spacer tube (6), a U-shaped heat exchange tube assembly (7), a nut (8), and a support plate (9). The isolation section cylinder (2) is fixedly installed between the outer tube sheet (1) and the inner tube sheet (3). Both the outer tube sheet (1) and the inner tube sheet (3) have through holes on their surfaces, and the through holes on the outer tube sheet (1) and the inner tube sheet (3) are arranged in the same way. The U-shaped heat exchange tube assembly (7) passes through the outer tube sheet (1) and the inner tube sheet (3) one after the other. The inner tube plate (3) is connected to the through hole and fixedly connected. A pull rod (4) is spirally connected to one side surface of the inner tube plate (3). An expansion groove (301) is opened on the inner side surface of the through hole of the inner tube plate (3). The surface of the U-shaped heat exchange tube group (7) is provided with a first expansion tube (701) and a second expansion tube (703) located on the inner side of the through hole of the inner tube plate (3) and the outer tube plate (1). The surface of the first expansion tube (701) is also provided with a secondary expansion tube (702), and the secondary expansion tube (702) expands and embeds into the expansion groove (301) for sealing and docking.

2. The U-shaped tubular double tube sheet bundle with an isolation section according to claim 1, characterized in that: The baffle (5) and support plate (9) are provided with through holes and positioning holes. The tie rod (4) and U-shaped heat exchange tube group (7) pass through the through holes through the baffle (5) and support plate (9). There are multiple baffles (5). The multiple baffles (5) pass through the positioning holes through the spacer tube (6) and are controlled by nuts (8).

3. A U-shaped tubular double tube sheet bundle with an isolation section according to claim 2, characterized in that: The edges of the baffle plate (5) and the support plate (9) are provided with slides (10).

4. A U-shaped tubular double tube sheet bundle with an isolation section according to claim 3, characterized in that: The surface of the isolation section cylinder (2) is connected by welding with a long neck flange (11), and there are two long neck flanges (11).

5. A U-shaped tubular double tube sheet bundle with an isolation section according to claim 4, characterized in that: The expansion groove (301) has a width of 9 mm and a depth of 0.5 mm, and multiple tie rods (4) and U-shaped heat exchange tube groups (7) are provided as needed.

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