Heat exchange tube and tube end mounting structure

Abstract

The utility model provides a kind of heat exchange pipe and pipe end mounting structure, solve the permanent connection that heat exchange pipe's pipe end is installed on tube plate using expansion joint, welding, replace or repair single heat exchange pipe needs to damage pipe end or reaming, time-consuming and vulnerable to damage tube plate, lead to later maintenance difficult problem.The utility model uses the mode of thread connection to install and fix the left end of heat exchange pipe, the quick disassembly and replacement of heat exchange pipe can be realized by screwing, compared with the permanent installation mode using expansion joint, welding, this mode can avoid damage to tube plate and other heat exchange pipes, reduce maintenance cost, and heat exchange pipe uses thread connection as mechanical fastening, without high temperature or high pressure deformation process, process flow can be simplified, optimize cost.

Description

Technical Field

[0001] This utility model relates to the field of heat exchanger technology, and in particular to a heat exchange tube and tube end mounting structure. Background Technology

[0002] There are many types of heat exchangers, among which shell-and-tube heat exchangers are commonly used equipment in industries such as petroleum, chemical, nuclear power, special boiler systems, light industry, and food processing. A shell-and-tube heat exchanger mainly consists of a shell, tube bundle, first tube sheet, baffles, and end caps. The shell is generally circular, and the tube bundle contains anywhere from a few hundred to over a thousand tubes. The tube bundle is fixed at both ends to the first tube sheet, and passes through small holes in multiple baffles in the middle.

[0003] A tube bundle consists of multiple heat exchange tubes. The tube ends are the ends of the heat exchange tubes. The tube ends of the heat exchange tubes are installed on the tube sheet using specific processes (such as expansion joints and welding) to achieve sealing and fixation. However, expansion joints and welding are permanent connections. Replacing or repairing a single heat exchange tube requires damaging the tube end or enlarging the hole, which is time-consuming and can easily damage the tube sheet, leading to difficulties in later maintenance. Utility Model Content

[0004] To address the problem in the prior art where heat exchanger tubes are permanently connected by expansion joints or welding to the tube sheet, replacing or repairing a single heat exchanger tube requires damaging the tube end or enlarging the hole, which is time-consuming and easily damages the tube sheet, leading to difficulties in later maintenance, this utility model proposes a heat exchanger tube and tube end installation structure.

[0005] The technical solution of this utility model is: a heat exchange tube and tube end installation structure, including a shell, the shell being a pipe structure extending in the left and right direction, a support being provided at the bottom of the shell, a first tube box being connected to the left end of the shell by a bolt flange, and a second tube box being connected to the right end of the shell by a bolt flange.

[0006] A first tube sheet is fixed between the shell and the first tube box. The first tube sheet is a circular plate structure. Multiple threaded holes that are open from left to right are opened on the first tube sheet. The multiple threaded holes are evenly distributed along its plane.

[0007] The shell contains multiple heat exchange tubes extending in the left and right directions. The left end of each heat exchange tube has an external thread section. The left ends of the multiple heat exchange tubes are threaded through the external thread section into multiple threaded holes, and the left ends of the heat exchange tubes pass through the threaded holes and extend into the first tube box.

[0008] An annular groove is formed on the inner wall of the right end of the shell. The inner diameter of the annular groove is larger than that of the inner wall of the shell. A second tube sheet is provided in the annular groove, and its outer wall fits against the inner wall of the annular groove. Multiple through holes are formed on the second tube sheet, which correspond one-to-one with the threaded holes. The right end of the heat exchange tube passes through the through hole and is fixed with a hexagonal ring. When the heat exchange tube is rotated, the hexagonal ring is pressed against the second tube sheet by the thread to seal the connection between the heat exchange tube and the through hole. At the same time, the second tube sheet is pressed into the annular groove to seal the connection between the shell and the second tube sheet.

[0009] Preferably, an annular gasket is provided between the second tube sheet and the annular groove, and a sealing gasket is provided between the second tube sheet and multiple hexagonal rings, with multiple round holes for the heat exchange tubes to pass through on the sealing gasket.

[0010] Preferably, a plurality of guide tubes are fixedly provided on the side of the second tube sheet away from the hexagonal ring, and the guide tubes correspond one-to-one with the through holes and are sleeved on the heat exchange tubes.

[0011] Preferably, the second pipe box is a tubular structure that is open on both sides, and a sealing cover is connected to the flange at the right opening of the second pipe box.

[0012] Preferably, a pipe-side inlet pipe is fixedly connected and connected to the first pipe box, and a pipe-side outlet pipe is fixedly connected and connected to the second pipe box;

[0013] A shell-side water inlet pipe is fixedly connected and connected to the outer circumferential surface of the left end of the shell, and a shell-side water outlet pipe is fixedly connected and connected to the outer circumferential surface of the right end of the shell.

[0014] Advantages of this invention: This invention uses a threaded connection to install and fix the left end of the heat exchange tube. The heat exchange tube can be quickly disassembled and replaced by screwing. Compared to permanent installation methods such as expansion joints or welding, this method avoids damage to the tube sheet and other heat exchange tubes, reducing maintenance costs. Furthermore, the threaded connection provides mechanical fastening, eliminating the need for high-temperature or high-pressure deformation processes, simplifying the process and optimizing costs. Simultaneously, a hexagonal ring is provided at the right end of the heat exchange tube, allowing the heat exchange tube to be threaded onto the second tube sheet during rotation, sealing the connection between the heat exchange tube and the through-hole. The heat exchange tube can also press the second tube sheet against the annular groove via the hexagonal ring, sealing the connection between the shell and the second tube sheet, forming a double-sealing structure. Fixing is completed simply by rotating the heat exchange tube, without the need for specialized equipment, making installation convenient. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0017] Figure 2 This utility model Figure 1 The front view of the structure;

[0018] Figure 3 This utility model Figure 1 A cross-sectional view of the structure;

[0019] Figure 4 This utility model Figure 1 A partial structural diagram after removing the first pipe box;

[0020] Figure 5 This utility model Figure 1 A partial structural diagram after removing the second pipe box;

[0021] Figure 6 This is a schematic diagram of the structure of the second tube sheet of this utility model.

[0022] In the diagram: 1. Shell; 101. Support; 2. First tube box; 3. Second tube box; 4. First tube sheet; 5. Heat exchange tube; 51. External thread section; 6. Second tube sheet; 7. Hexagonal ring; 8. Guide tube; 9. Tube-side water inlet pipe; 10. Tube-side water outlet pipe; 11. Shell-side water inlet pipe; 12. Shell-side water outlet pipe; 13. Sealing cap. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Example 1: A heat exchange tube and tube end mounting structure, such as Figure 1-6As shown, the system includes a housing 1, which is a pipe structure extending in the left-right direction. A support 101 is provided at the bottom of the housing 1. A first pipe box 2 is connected to the left end of the housing 1 by a bolt flange, and a second pipe box 3 is connected to the right end of the housing 1 by a bolt flange. A first tube sheet 4 is fixed between the housing 1 and the first pipe box 2. The first tube sheet 4 is a circular plate structure with multiple threaded holes that are open in both the left and right directions. The multiple threaded holes are evenly distributed along its plane. Multiple heat exchange tubes 5 extending in the left-right direction are provided inside the housing 1. An external threaded section 51 is provided at the left end of the heat exchange tube 5. The left ends of the multiple heat exchange tubes 5 are threaded through the external threaded section 51 into the multiple threaded holes. The heat exchange tubes 5 are threadedly sealed between the external threaded section 51 and the threaded holes, and the left ends of the heat exchange tubes 5 pass through the threaded holes and extend into the first pipe box 2.

[0025] The method of installing and fixing the left end of the heat exchange tube 5 by using a threaded connection allows for quick disassembly and replacement of the heat exchange tube 5 by screwing. Compared with the permanent installation method of expansion joint or welding, this method can avoid damage to the first tube sheet 4 and other heat exchange tubes 5, reduce maintenance costs, and the threaded connection of the heat exchange tube 5 is a mechanical fastening that does not require high temperature or high pressure deformation process, which can simplify the process and optimize costs.

[0026] An annular groove is formed on the inner wall of the right end of the shell 1. The inner diameter of the annular groove is larger than that of the inner wall of the shell 1. A second tube sheet 6 is installed in the annular groove, and its outer wall fits against the inner wall of the annular groove. The shell 1, the first tube sheet 4, and the second tube sheet 6 together form a shell-side channel. The second tube sheet 6 has multiple through holes that correspond one-to-one with the threaded holes. The right end of the heat exchange tube 5 passes through the through hole and is fixed with a hexagonal ring 7. The hexagonal ring 7 has a hexagonal structure, which makes it easy to rotate the hexagonal ring 7 with an electric wrench and drive the heat exchange tube 5 to rotate. When the heat exchange tube 5 rotates, the hexagonal ring 7 can be pressed against the second tube sheet 6 by the thread action to seal the connection between the heat exchange tube 5 and the through hole. The heat exchange tube 5 can press the second tube sheet 6 into the annular groove through the hexagonal ring 7 to seal the connection between the shell 1 and the second tube sheet 6, forming a double sealing structure. Moreover, it can be fixed by simply rotating the heat exchange tube, without the need for special equipment for connection, making the installation convenient.

[0027] An annular gasket is provided between the second tube sheet 6 and the annular groove to further increase the sealing performance at the connection between the shell 1 and the second tube sheet 6. A sealing gasket is provided between the second tube sheet 6 and multiple hexagonal rings 7 to further increase the sealing performance at the connection between the heat exchange tube 5 and the through hole. Multiple round holes are provided on the sealing gasket for the heat exchange tube 5 to pass through. The annular gasket and the sealing gasket are made of flexible graphite material, which has high temperature resistance and can be used for high temperatures inside the heat exchanger.

[0028] Multiple guide cylinders 8 are fixedly provided on the side of the second tube sheet 6 away from the hexagonal ring 7. The multiple guide cylinders 8 correspond one-to-one with multiple through holes. The guide cylinders 8 are sleeved on the heat exchange tube 5. The guide cylinders 8 guide the heat exchange tube 5 in the horizontal direction during installation to avoid the heat exchange tube 5 failing to align with the threaded hole during installation. The end of the heat exchange tube 5 with the threaded hole is chamfered so that the end of the heat exchange tube 5 can smoothly enter the threaded hole.

[0029] The first tube box 2 is a cylindrical structure with an opening on the right, and the second tube box 3 is a tubular structure that is open on both sides. The flange at the right opening of the second tube box 3 is connected to a sealing cover 13. By setting the sealing cover 13, the right opening of the second tube box 3 can be easily opened, so that the heat exchange tube 5 can be rotated through the hexagonal ring 7 to disassemble and maintain the heat exchange tube 5.

[0030] A tube-side inlet pipe 9 is fixedly connected and connected to the first tube box 2, and a tube-side outlet pipe 10 is fixedly connected and connected to the second tube box 3. The tube-side fluid enters the first tube box 2 from the tube-side outlet pipe 10, then enters the left end of the heat exchange tube 5, passes through the heat exchange tube 5 and exchanges heat with the shell-side fluid in the shell 1, then enters the second tube box 3 and is discharged from the tube-side outlet pipe 10. A shell-side inlet pipe 11 is fixedly connected and connected to the outer circumferential surface of the left end of the shell 1, and a shell-side outlet pipe 12 is fixedly connected and connected to the outer circumferential surface of the right end of the shell 1. The shell-side fluid enters the shell 1 from the shell-side inlet pipe 11, flows to the right and exchanges heat with the heat exchange tube 5, and then is discharged from the shell-side outlet pipe 12.

[0031] Working principle: When the tube-side fluid flows, it enters the first tube box 2 from the tube-side inlet pipe 9, and is distributed to the left end of each heat exchange tube 5 through the threaded hole of the first tube sheet 4. After flowing through the inside of the heat exchange tube 5, it enters the second tube box 3 and is finally discharged from the tube-side outlet pipe 10. When the shell-side fluid flows, it enters the left end of the shell 1 from the shell-side inlet pipe 11, flows to the right in the shell-side channel between the shell 1 and the outer wall of the heat exchange tube 5, and exchanges heat with the tube-side fluid in the heat exchange tube 5 in a counter-current manner before being discharged from the shell-side outlet pipe 12.

[0032] When installing the heat exchange tube 5, first fix the first tube box 2 and the first tube sheet 4 to the left end of the shell 1 with bolts. Then fix the second tube sheet 6 in the annular groove at the right end of the shell 1, and make the through holes on the second tube sheet 6 correspond one-to-one with the threaded holes on the first tube sheet 4. Then insert the heat exchange tube 5 into the through hole, and then pass through the shell 1 into the threaded hole. Rotate the hexagonal ring 7 and the heat exchange tube 5 with an electric wrench. The hexagonal ring 7 presses the sealing gasket under the action of the thread, sealing the gap between the heat exchange tube 5 and the through hole of the second tube sheet 6, forming a second sealing interface. The reaction force of the hexagonal ring 7 presses the second tube sheet 6 onto the annular gasket in the annular groove, realizing the edge sealing between the shell 1 and the second tube sheet 6. Then install the second tube box 3 and the sealing cover 13 on the right end of the shell 1 with bolts.

[0033] During maintenance and disassembly, open the sealing cover 13 of the second tube box 3, use a wrench to rotate the hexagonal ring 7, and rotate the heat exchange tube 5 in the opposite direction to remove it from the threaded hole of the first tube sheet 4, thus achieving non-destructive disassembly of a single heat exchange tube.

[0034] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims and not by the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A heat exchange tube and tube end mounting structure, characterized in that: The application relates to a heat exchanger, which comprises a shell (1), the shell (1) is a pipeline structure extending along the left-right direction, the bottom of the shell (1) is provided with a support (101), the left end of the shell (1) is connected with a first pipe box (2) through bolt flanges, the right end of the shell (1) is connected with a second pipe box (3) through bolt flanges; A first pipe plate (4) is fixedly arranged between the shell (1) and the first pipe box (2), the first pipe plate (4) is a circular plate structure, a plurality of left-right penetrating threaded holes are formed in the first pipe plate (4), and the plurality of threaded holes are uniformly arranged along the plane direction of the first pipe plate (4); A plurality of heat exchange pipes (5) extending along the left-right direction are arranged in the shell (1), an outer threaded section (51) is formed in the left end of each heat exchange pipe (5), the left ends of the plurality of heat exchange pipes (5) are threadedly arranged in the plurality of threaded holes through the outer threaded sections (51), and the left ends of the heat exchange pipes (5) penetrate through the threaded holes and extend into the first pipe box (2); An annular groove is formed in the right end inner wall of the shell (1), the inner diameter of the annular groove is larger than the inner wall of the shell (1), a second pipe plate (6) is arranged in the annular groove, the outer wall of the second pipe plate (6) is attached to the inner wall of the annular groove, a plurality of through holes corresponding to the threaded holes one by one in the left-right direction are formed in the second pipe plate (6), the right ends of the heat exchange pipes (5) are arranged in the through holes, the right ends of the heat exchange pipes (5) penetrate out of the through holes and are fixedly provided with hexagonal rings (7), when the heat exchange pipes (5) are rotated, the hexagonal rings (7) are pressed against the second pipe plate (6) to seal the connection between the heat exchange pipes (5) and the through holes, and the second pipe plate (6) is pressed against the annular groove to seal the connection between the shell (1) and the second pipe plate (6).

2. A heat exchanging tube and tube end mounting structure according to claim 1, characterized in that: An annular gasket is arranged between the second pipe plate (6) and the annular groove, sealing gaskets are arranged between the second pipe plate (6) and the plurality of hexagonal rings (7), and a plurality of circular holes through which the heat exchange pipes (5) pass are formed in the sealing gaskets.

3. A heat exchanging tube and tube end mounting structure according to claim 1, characterized in that: A plurality of guide cylinders (8) are fixedly arranged on the side of the second pipe plate (6) away from the hexagonal rings (7), the guide cylinders (8) correspond to the through holes one by one and are sleeved on the heat exchange pipes (5).

4. The heat exchanging tube and tube end mounting structure according to claim 1, characterized by: The second pipe box (3) is a left-right penetrating tubular structure, and a sealing cover (13) is flange-connected to the right opening of the second pipe box (3).

5. The heat exchanging tube and tube end mounting structure according to claim 1, characterized by: A tube-pass water inlet pipe (9) is fixedly connected to and communicates with the first pipe box (2), and a tube-pass water outlet pipe (10) is fixedly connected to and communicates with the second pipe box (3); A shell-pass water inlet pipe (11) is fixedly connected to and communicates with the left end outer circumferential surface of the shell (1), and a shell-pass water outlet pipe (12) is fixedly connected to and communicates with the right end outer circumferential surface of the shell (1).

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