Pipe guiding device for assembling a tube bundle of a u-tube heat exchanger

Abstract

The utility model discloses a kind of pipe leading device for U-shaped tube heat exchanger tube bundle assembly, including two pipe leading components of symmetrical arrangement, pipe leading component includes conical frustum and guide pipe sequentially coaxially arranged, the small mouth end of conical frustum is fixedly connected with guide pipe end, the other end of guide pipe is fixed with fixed nut, connection bolt is screwed into in fixed nut, the hexagonal head of connection bolt is connected with pull plate, the end of pull plate is provided with lifting ring, lead screw is arranged between the pull plate of two pipe leading components, two locating nuts are arranged on the lead screw between two pull plates, two locating nuts are respectively close on corresponding pull plate side surface, lifting ring between two pipe leading components is provided with pull rope. In conclusion, the utility model has the advantages that pipe threading is smooth, heat exchange tube is not damaged, and pipe threading efficiency can be improved.

Description

Technical Field

[0001] This utility model relates to the technical field of tube bundle assembly equipment, specifically to a tube bundle assembly device for U-shaped tube heat exchangers. Background Technology

[0002] U-tube heat exchangers are a type of shell-and-tube heat exchanger. Their core feature is that the heat exchange tubes are bent into a U-shape. The two ends of the U-shaped tube bundle are fixed to the same tube sheet and installed inside the shell. The U-shaped tube has two parallel straight tube sections and a bent tube section connecting one end of the two straight tube sections.

[0003] According to process requirements, U-tube heat exchanger tube bundles are equipped with multiple layers of baffles inside the shell. The baffles are composed of multiple sets of alternating longitudinal and transverse baffle rods. In traditional manufacturing processes, the bent sections of the U-tubes are pushed so that the straight sections of the U-tubes pass through each layer of baffles to the tube sheet end in sequence. In actual manufacturing, it has been found that during the tube bundle insertion and assembly, due to manufacturing deviations of the baffles or factors such as compression of the U-tubes, the baffle mesh can deform. This can prevent the straight sections of the U-tubes from passing through smoothly, or cause the two straight ends of the U-tubes to be inserted asynchronously. In traditional manufacturing processes, tools such as wooden sticks are used to tap the bent sections of the U-tubes to facilitate the push. This process is not only inefficient, but also prone to damage such as repeated expansion and deformation of the bent sections of the U-tubes, and denting of the U-tubes due to stress. This reduces the product quality of the U-tubes and may also affect the normal progress of the tube insertion and assembly process. Therefore, it is an objective need to develop a tube-leading device for assembling U-tube heat exchanger tube bundles that allows for smooth tube insertion without damaging the heat exchange tubes and improves tube insertion efficiency. Utility Model Content

[0004] The purpose of this utility model is to provide a tube-leading device for assembling U-shaped tube heat exchanger tube bundles that allows for smooth tube insertion without damaging the heat exchange tubes and improves tube insertion efficiency.

[0005] The purpose of this utility model is achieved as follows: it includes two symmetrically arranged tube assemblies. Each tube assembly includes a truncated cone and a guide tube arranged coaxially in sequence. The small end of the truncated cone is fixedly connected to the end of the guide tube. The other end of the guide tube is fixed with a fixing nut. A connecting bolt is screwed into the fixing nut. The hexagonal head of the connecting bolt is connected to a pull plate. A lifting ring is provided at the end of the pull plate. A threaded rod is provided through the pull plates of the two tube assemblies. Two positioning nuts are provided on the threaded rod between the two pull plates. The two positioning nuts are respectively tightly attached to the side of the corresponding pull plate. A pull rope is provided between the lifting rings of the two tube assemblies.

[0006] Furthermore, the catheter includes two sleeves and a thin rod. The two ends of the thin rod extend into the two sleeves respectively. Several through holes are machined at intervals on the thin rod. Insertion holes are machined on the sleeves near the ends. Positioning rods are inserted into the insertion holes and through holes. Grooves are machined on the inner wall of the sleeves corresponding to the lower end of the positioning rod. The upper end of the positioning rod is flush with the outer wall of the sleeves. Magnets are provided at the lower end of the positioning rod and in the groove.

[0007] Furthermore, a blind hole is machined at the upper end of the positioning rod, and a lifting plate is installed inside the blind hole.

[0008] Furthermore, the diameter of the conduit is one-half to two-thirds of the outer diameter of the U-shaped tube.

[0009] Furthermore, the length of the conduit is more than 100mm longer than that of the U-shaped tube.

[0010] Furthermore, a pull ring is provided in the middle of the pull rope.

[0011] Furthermore, a positioning cylinder is coaxially provided at the large end of the truncated cone, and the diameter of the positioning cylinder is smaller than the diameter of the large end of the truncated cone.

[0012] This utility model is used for assembling U-tube heat exchanger tube bundles, specifically for guiding the U-tubes during tube insertion. In use, the truncated cone and guide tube are first assembled as required. The truncated cone and guide tube are then passed through the tube sheet side holes in reverse through each layer of baffles. That is, the truncated cone and guide tube of the two guide tube assemblies pass through the tube sheet holes through which the same U-tube needs to pass in reverse, and then pass through each layer of baffles sequentially, so that the truncated cone of the guide tube assembly extends to the outermost baffle. Then, the two ends of the prepared U-tube are spot-welded to the truncated cones of the two guide tube assemblies for positioning, ensuring a firm connection between the straight section end of the U-tube and the large end of the truncated cone. After spot welding, the weld points are ground smooth and cleaned. After cleaning, connect the pull plates to the guide tube using connecting bolts and fixing nuts. Install the lead screw between the two pull plates and adjust the distance between the two pull plates using the positioning nut according to the bending radius of the U-shaped tube. Connect the pull rope to the lifting ring and use a traction machine such as a flatbed truck to apply a parallel force to the pull rope, pull the pull rope and the guide tube assembly, and then pull the U-shaped tube to move horizontally. The straight section of the U-shaped tube passes through each layer of baffles in sequence and finally exits from the tube hole of the tube sheet. After reaching the predetermined position, the U-shaped tube is installed. Cut open the spot weld area between the truncated cone and the U-shaped tube and clean it. Disassemble the guide tube assembly. Then, follow the above steps to install the tubes one by one to complete the assembly of the entire tube bundle. In this invention, during the pipe-threading process, a traction machine such as a flatbed truck provides power to move the pipe-leading assembly horizontally. The pipe-leading assembly then moves the U-shaped pipe horizontally. During this movement, because the truncated cone is at the front, when it encounters the deformed baffle mesh, the conical surface of the truncated cone contacts the mesh and gradually opens it. As the truncated cone passes, the mesh is opened, allowing the straight section of the U-shaped pipe to pass smoothly. This method prevents the jamming problems that easily occur in traditional direct pipe-threading processes, ensuring a smooth pipe-threading process and improving efficiency. This invention improves efficiency and prevents the U-shaped tube from being scratched by the baffles during the insertion process. Secondly, in traditional tube insertion, tools such as wooden sticks are used to strike the curved section of the U-shaped tube to facilitate its advancement. However, in this invention, the power required for U-shaped tube insertion is provided by a traction machine such as a flatbed cart. This improves insertion efficiency while providing sufficient and stable pulling force, avoiding the need for striking with wooden sticks or other tools. This prevents deformation, dents, and other damage to the U-shaped tube caused by striking, ensuring the quality of the U-shaped tube during insertion and guaranteeing the smooth progress of the tube insertion and assembly process. In summary, this invention offers the advantages of smooth tube insertion, no damage to the heat exchange tube, and improved insertion efficiency. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a cross-sectional view of the inlet tube assembly in this utility model; Figure 3 for Figure 2 A magnified structural diagram of node A in the middle; In the diagram: 1-Frustum conicum, 2-Conduit, 3-Fixing nut, 4-Connecting bolt, 5-Pull plate, 6-Lifting ring, 7-Threaded rod, 8-Positioning nut, 9-Pull rope, 10-Sleeve, 11-Thin rod, 12-Positioning rod, 13-Magnet, 14-Lifting plate, 15-U-shaped tube, 16-Pull ring, 17-Positioning cylinder. Detailed Implementation

[0014] The present invention will be further described below with reference to the accompanying drawings, but this description is not intended to limit the present invention in any way. Any changes or improvements made based on the present invention shall fall within the protection scope of the present invention.

[0015] like Figures 1-3 As shown, this utility model includes two symmetrically arranged tube assemblies. Each tube assembly includes a truncated cone 1 and a guide tube 2 arranged coaxially in sequence. The small end of the truncated cone 1 is fixedly connected to the end of the guide tube 2. The other end of the guide tube 2 is fixed with a fixing nut 3. A connecting bolt 4 is screwed into the fixing nut 3. The hexagonal head of the connecting bolt 4 is connected to a pull plate 5. A lifting ring 6 is provided at the end of the pull plate 5. A threaded rod 7 is provided between the pull plates 5 of the two tube assemblies. Two positioning nuts 8 are provided on the threaded rod 7 between the two pull plates 5. The two positioning nuts 8 are respectively tightly attached to the side of the corresponding pull plate 5. A pull rope 9 is provided between the lifting rings 6 of the two tube assemblies. The pull rope 9 can be a steel rope or other sturdy ropes can be selected according to the actual situation.

[0016] This utility model is used for assembling U-tube heat exchanger tube bundles, specifically for guiding the U-tube 15 during tube insertion. In use, first assemble the truncated cone 1 and the guide tube 2 as required. Then, pass the truncated cone 1 and the guide tube 2 through the tube holes on the tube sheet side in reverse through each layer of baffles. That is, the truncated cone 1 and the guide tube 2 of the two guide tube assemblies pass through the tube sheet tube holes that the same U-tube 15 needs to pass through in reverse, and then pass through each layer of baffles in sequence, so that the truncated cone 1 of the guide tube assembly extends to the outer side of the outermost baffle. Then, spot weld the two ends of the prepared U-tube 15 to the truncated cone 1 of the two guide tube assemblies for positioning, so that the straight tube end of the U-tube 15 is firmly connected to the large end of the truncated cone 1. After spot welding, grind the weld points flat and clean them. Connect the pull plate 5 to the guide tube 2 using connecting bolts 4 and fixing nuts 3. Install the screw 7 between the two pull plates 5. Adjust the distance between the two pull plates 5 using positioning nuts 8 according to the bending radius of the U-shaped tube 15. Connect the pull rope 9 to the lifting ring 6. Use a traction machine such as a flatbed truck to apply a parallel force to the pull rope 9, pull the pull rope 9 and the guide tube assembly, and then pull the U-shaped tube 15 to move horizontally. The straight section of the U-shaped tube 15 passes through each layer of baffles in sequence and finally exits from the tube hole of the tube sheet. After reaching the predetermined position, the insertion of the U-shaped tube 15 is completed. Cut open the spot weld area between the cone 1 and the U-shaped tube 15 and clean it. Disassemble the guide tube assembly. Then, follow the above steps to insert the guide tubes one by one to complete the assembly of the entire tube bundle.

[0017] In this invention, during the pipe-threading process, a traction machine such as a flatbed truck provides power, and the traction force is at the same height as the pipe-leading assembly and the U-shaped pipe 15, driving the pipe-leading assembly to move horizontally. The pipe-leading assembly then drives the U-shaped pipe 15 to move horizontally. During this movement, since the truncated cone 1 is in front, when it encounters the deformed baffle mesh, the conical surface of the truncated cone 1 contacts the mesh and gradually opens it. As the truncated cone 1 passes through, the mesh is opened, allowing the straight section of the U-shaped pipe 15 to pass smoothly. This method prevents the jamming problem that easily occurs in traditional direct pipe-threading processes, ensuring a smooth pipe-threading process. The smoothness of the process improves the efficiency of pipe threading and prevents the U-shaped tube 15 from being scratched by the baffle during the threading process. Secondly, in the traditional pipe threading process, wooden sticks or other tools are used to strike the curved section of the U-shaped tube 15 to facilitate its advancement. However, in this utility model, the power required for pipe threading of the U-shaped tube 15 is provided by a traction machine such as a flatbed cart, which improves the efficiency of pipe threading while providing sufficient and relatively stable pulling force. This avoids the need for striking with wooden sticks or other tools, thereby preventing damage such as deformation and dents to the U-shaped tube 15 caused by striking. This ensures the quality of the U-shaped tube 15 during the pipe threading process and ensures the normal progress of the pipe threading and assembly process.

[0018] The conduit 2 includes two sleeves 10 and a thin rod 11. The two ends of the thin rod 11 extend into the two sleeves 10 respectively. Several through holes are machined on the thin rod 11 at intervals. Insertion holes are machined on the sleeves 10 near the ends. Positioning rods 12 are inserted into the insertion holes and through holes. Grooves are machined on the inner wall of the sleeves 10 corresponding to the lower end of the positioning rod 12. The upper end of the positioning rod 12 is flush with the outer wall of the sleeves 10. Magnets 13 are provided at the lower end of the positioning rod 12 and in the groove. The length of the conduit 2 is not shorter than the length of the U-shaped tube 15. When in use, it will occupy a large amount of factory space. Therefore, it is designed as a telescopic structure. When in use, it can be stretched out and when not in use, it can be shortened to reduce the space occupied and facilitate storage. At the same time, by stretching and shortening, it can also meet the tube insertion requirements of U-shaped tubes 15 of different lengths. The stretching and shortening of the conduit 2 is adjusted by the positioning rod 12. When the length needs to be adjusted, the positioning rod 12 is pulled out to increase or decrease the length of the thin rod 11 inserted into the sleeve 10. After the length is adjusted appropriately, the positioning rod 12 is reinserted for positioning. The magnets 13 attract each other to prevent the positioning rod 12 from accidentally falling off.

[0019] The upper end of the positioning rod 12 is machined with a blind hole, and a lifting plate 14 is installed in the blind hole. When it is necessary to adjust the length of the entire guide tube 2, it is necessary to adjust the relative position between the sleeve 10 and the thin rod 11, which requires pulling out the positioning rod 12. However, since the end of the positioning rod 12 is flush with the outer wall of the sleeve 10, it is inconvenient to pull out the positioning rod 12. To solve this problem, a blind hole and a lifting plate 14 are provided. In this way, the positioning rod 12 can be pulled out by clamping the lifting plate 14. After the adjustment is completed, the positioning rod 12 can be inserted again.

[0020] Preferably, the diameter of the conduit 2 is one-half to two-thirds of the outer diameter of the U-shaped tube 15. In order to ensure the smooth conduit introduction process, the diameter of the conduit 2 is generally smaller than the outer diameter of the U-shaped tube 15, which makes it easier to pass through the mesh of the baffle grid, can withstand sufficient tension, and has a certain rigidity that is not easily deformed. The specific outer diameter can be determined according to actual needs.

[0021] Preferably, the length of the conduit 2 is more than 100mm longer than the length of the U-shaped tube 15. For ease of operation, the length of the conduit 2 should not be less than the length of the U-shaped tube 15. Considering that it is convenient to spot weld the U-shaped tube 15 to the truncated cone 1 and install the pull plate 5 to the conduit 2, the conduit 2 is made more than 100mm longer than the U-shaped tube 15. The specific dimensions can be determined according to the actual situation, as long as it is convenient for operation and meets the needs of tube insertion.

[0022] A pull ring 16 is provided in the middle of the pull rope 9. This utility model uses a traction machine to pull the pull rope 9 to move it horizontally, thereby driving the two guide tube assemblies and the U-shaped tube 15 to move horizontally, completing the insertion of the U-shaped tube 15. However, in actual use, it was found that when the two guide tube assemblies move horizontally, they will come into contact with the corresponding baffle grid holes. Due to the different deformation of the baffle grid holes, the resistance caused by the horizontal movement of the two guide tube assemblies will also be different. This will cause the two guide tube assemblies to move asynchronously, and the force point of the pull rope 9 will shift from the middle, which is not conducive to the smooth progress of the insertion process. In order to avoid the above problems, the pull ring 16 is provided. The pull ring 16 fixes the force point of the pull rope 9 in the middle position, ensuring the synchronicity of the horizontal movement of the two guide tube assemblies, thereby ensuring the smooth progress of the insertion process.

[0023] A positioning cylinder 17 is coaxially provided at the large end of the truncated cone 1. The diameter of the positioning cylinder 17 is smaller than the diameter of the large end of the truncated cone 1. In actual use, it has been found that when the end of the U-shaped tube 15 is spot-welded to the truncated cone 1 for positioning, misalignment often occurs, which may affect the stability of the tube insertion process. After setting the positioning cylinder 17, the straight section of the U-shaped tube 15 will be fitted onto the positioning cylinder 17, thereby positioning the U-shaped tube. This can easily ensure that the U-shaped tube 15 and the positioning cylinder 17 are concentric, thus ensuring the concentricity of the U-shaped tube 15 and the truncated cone 1 and guaranteeing the smoothness of the subsequent tube insertion process.

Claims

1. A pipe leading device for assembling a U-tube heat exchanger tube bundle, comprising two pipe leading assemblies symmetrically arranged, characterized in that: The tube assembly includes a truncated cone (1) and a conduit (2) arranged coaxially in sequence. The small end of the truncated cone (1) is fixedly connected to the end of the conduit (2). The other end of the conduit (2) is fixed with a fixing nut (3). A connecting bolt (4) is screwed into the fixing nut (3). The hexagonal head of the connecting bolt (4) is connected to a pull plate (5). A lifting ring (6) is provided at the end of the pull plate (5). A threaded rod (7) is provided between the pull plates (5) of the two tube assemblies. Two positioning nuts (8) are provided on the threaded rod (7) between the two pull plates (5). The two positioning nuts (8) are respectively tightly attached to the side of the corresponding pull plate (5). A pull rope (9) is provided between the lifting rings (6) of the two tube assemblies.

2. A U-tube heat exchanger tube bundle assembling lead pipe device according to claim 1, characterized in that: The conduit (2) includes two sleeves (10) and a thin rod (11). The two ends of the thin rod (11) extend into the two sleeves (10) respectively. Several through holes are processed on the thin rod (11) at intervals. Insertion holes are processed on the sleeves (10) near the end. Positioning rods (12) are inserted into the insertion holes and through holes. Grooves are processed on the inner wall of the sleeves (10) corresponding to the lower end of the positioning rod (12). The upper end of the positioning rod (12) is flush with the outer wall of the sleeves (10). Magnets (13) are provided at the lower end of the positioning rod (12) and in the groove.

3. A U-tube heat exchanger tube bundle assembling lead pipe device according to claim 2, characterized in that: The upper end of the positioning rod (12) is machined with a blind hole, and a lifting plate (14) is provided in the blind hole.

4. A U-tube heat exchanger tube bundle assembling lead pipe device according to claim 1, characterized in that: The diameter of the conduit (2) is one-half to two-thirds of the outer diameter of the U-shaped tube (15).

5. A U-tube heat exchanger tube bundle assembling lead pipe device according to claim 1, characterized in that: The length of the conduit (2) is more than 100 mm longer than the length of the U-shaped tube (15).

6. A U-tube heat exchanger tube bundle assembling lead pipe device according to claim 1, characterized in that: A pull ring (16) is provided in the middle of the pull rope (9).

7. A U-tube heat exchanger tube bundle assembling lead pipe device according to claim 1, characterized in that: The large end of the truncated cone (1) is coaxially provided with a positioning cylinder (17), the diameter of which is smaller than the diameter of the large end of the truncated cone (1).

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