A heat exchanger tube insertion process
By combining support devices, tooling plates, grid strips, guide tubes, and jacks, the problems of interference and collision during the installation of bow-shaped heat exchange tubes were solved, achieving an efficient and collision-free installation process.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-06
- Publication Date
- 2026-04-03
AI Technical Summary
In existing technologies, bow-shaped heat exchange tubes are prone to interference and collisions during the tube insertion process, which affects the quality of the heat exchange tubes.
The process employs a combination of support devices, tooling plates, grid strips, guide tubes, and jacks. First, the pipes are laid out and fixed in position using the tooling plates. Then, the guide tubes and jacks assist in threading the pipes to avoid collisions.
It improves work efficiency, reduces the difficulty of pipe threading, avoids collisions between heat exchange tubes, and ensures the quality of heat exchange tubes.
Smart Images
Figure CN117718708B_ABST
Abstract
Description
[Technical Field]
[0001] This invention relates to the field of heat exchangers, and more particularly to a heat exchange tube insertion process. [Background Technology]
[0002] A heat exchanger is an energy-saving device that facilitates heat transfer between two or more fluids at different temperatures. It transfers heat from a higher-temperature fluid to a lower-temperature fluid, bringing the fluid temperature to the specified parameters to meet process requirements. It is also a key component for improving energy efficiency. The heat exchanger industry encompasses nearly 30 sectors, including HVAC, pressure vessels, wastewater treatment equipment, chemicals, and petroleum. A heat exchanger mainly consists of a shell, heat exchange tube bundles, tube sheets, and end caps. The shell is typically circular, containing parallel heat exchange tube bundles fixed at both ends to the tube sheets. Within the heat exchanger, one fluid flows inside the tubes (the tube side) and the other flows outside (the shell side).
[0003] In existing technologies, the tube-threading process for heat exchanger tubes typically involves threading each tube one by one into the tube sheet. Refer to Chinese Patent No. 202010925696.4, which discloses this method. This traditional method works fine when the heat exchanger tubes are straight. However, when the heat exchanger tubes are bow-shaped, this traditional method can easily cause interference between the tubes, resulting in damage. Please refer to [link to relevant documentation]. Figure 1 The bow-shaped heat exchange tube includes a left-end straight section for insertion into the left tube sheet, a right-end straight section for insertion into the right tube sheet, and a bow-shaped portion located between the left-end and right-end straight sections. The bow-shaped portion further includes a left-end inclined section connected to the left-end straight section, a right-end inclined section connected to the right-end straight section, and a middle straight section connecting the left-end and right-end inclined sections. When the heat exchange tube needs to be vertically inserted into the left tube sheet, the heat exchange tubes are inserted vertically one by one into the tube holes of the left tube sheet in an upward sequence. During the insertion of the upper heat exchange tube, the left-end inclined section of the upper heat exchange tube often interferes with the left-end inclined section of the lower heat exchange tube, causing the heat exchange tube to bump and affecting its quality.
[0004] Therefore, it is necessary to provide a heat exchanger tube insertion process to solve the above-mentioned technical problems. [Summary of the Invention]
[0005] To address the aforementioned problems, the present invention aims to provide a heat exchange tube installation process that prevents collisions between heat exchange tubes during the installation process.
[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a heat exchanger tube threading process, comprising the following steps: A. Providing a first support device, a first jack support device, a second jack support device, a baffle, a left end tooling plate, a right end tooling plate, a plurality of grid strips, a plurality of first guide tubes, a plurality of second guide tubes, a plurality of first jacks, a plurality of second jacks, a left end tube sheet, a right end tube sheet, and a plurality of heat exchanger tubes. The first support device includes an intermediate support mechanism for supporting the heat exchanger tubes, a left end support mechanism for supporting the left end tooling plate or the left end tube sheet, and a right end support mechanism for supporting the right end tooling plate or the right end tube sheet. The left end support... The mechanism includes: a lower left support and an upper left support; the right support mechanism includes a lower right support and an upper right support; a first jack support device is located at the left end of the first support device, and the first jack support device includes a first lower support and a first upper support above the first lower support; a second jack support device is located at the right end of the first support device, and the second jack support device includes a second lower support and a second upper support above the second lower support; the left tooling plate has several left tooling plate holes; the right tooling plate has several right tooling plate holes; the left tooling... The diameter of the tube hole in the tube sheet is larger than the diameter of the tube hole in the left end of the tube sheet, and the diameter of the tube hole in the tooling plate in the right end is larger than the diameter of the tube hole in the right end of the tube sheet. The thickness of the tooling plate in the left end is smaller than the thickness of the tube sheet in the left end, and the thickness of the tooling plate in the right end is smaller than the thickness of the tube sheet in the right end. B. First, install the left tooling plate on the lower left support of the left support mechanism of the first support device, and install the right tooling plate on the lower right support of the right support mechanism of the first support device. Then, lay the lower layer of heat exchange tubes. The heat exchange tubes include a left-end through-tube section, a right-end through-tube section, and an arc-shaped portion disposed between the left-end through-tube section and the right-end through-tube section. During laying, the left-end through-tube section of the heat exchange tube passes through the left end... The left end of the tooling plate is inserted into the tube hole of the tooling plate, so that the right end of the heat exchange tube is inserted into the tube hole of the right end of the tooling plate, and the arc-shaped part of the heat exchange tube is supported on the middle support mechanism of the first support device; C. Then, several grid strips are inserted into the tube gap of the left end of the heat exchange tube in an alternating manner to fix the position and spacing of the left end of the tube. After all the grid strips are inserted, the grid strips at the intersection of the outermost ring are spot welded together. Similarly, several grid strips are inserted into the tube gap of the right end of the heat exchange tube in an alternating manner to fix the position and spacing of the right end of the tube. After all the grid strips are inserted, the grid strips at the intersection of the outermost ring are spot welded together.D. After the positions and spacing of the left and right end tube sections are fixed by the grid strips, remove the left and right end tooling plates from the first support device. Then, polish and remove rust from the left and right end tube sections of all heat exchange tubes. After the treatment, use a sleeve to check whether there are burrs on the surface of each heat exchange tube's left and right end tube section. E. Then, install the left end tube sheet on the lower left support part of the left end support mechanism of the first support device, and insert several first guide tubes into the tube holes of the left end tube sheet. The conical guide head of the first guide tube is inserted into the left end tube section of the heat exchange tube. The stepped surface of the tapered guide head of the first guide tube abuts against the end face of the left end through-tube section. The right end tube plate is installed on the right end lower support part of the right end support mechanism of the first support device, and several second guide tubes are inserted into the tube holes of the right end tube plate. The tapered guide head of the second guide tube is inserted into the right end through-tube section of the heat exchange tube, and the stepped surface of the tapered guide head of the second guide tube abuts against the end face of the right end through-tube section. The first lower support of the first jack support device is erected on the left end of the first support device, and the second lower support of the second jack support device is erected on the right end of the first support device. Then, several first jacks are installed on the first jack support. On the first lower support of the support device, several second jacks are installed on the second lower support of the second jack support device. Then, a baffle is used to block the tail of the second guide tube, and the baffle is supported by several second jacks. Then, several first jacks work simultaneously to push the left end tube sheet to the right. The first guide tube gradually extends from the rear end of the left end tube sheet under the support of the left end through section. When the distance between the left end through section and the tube hole of the left end tube sheet reaches 5mm, the first jacks stop working, and the left end tube sheet stops moving to the right. The on-site personnel pull out all the first guide tubes from the rear of the left end tube sheet. After all the first guide tubes have been pulled out, the first jacks continue to work. Continue pushing the left tube sheet to the right until the left end of the heat exchange tube is completely inserted into the tube hole of the left tube sheet. After the tube insertion is completed, remove the grid strips inserted in the gap between the tubes of the left end tube sheet by grinding the weld points on the outer ring of the grid strips. After the tube insertion of the left end tube sheet and the heat exchange tube is completed, remove the baffle originally placed on the right and place it on the left to block the end of the heat exchange tube. Then, use several second jacks to push the right tube sheet to the left to complete the insertion of the right end tube sheet and the right end tube insertion of the heat exchange tube. The insertion method of the right end tube sheet and the right end tube insertion of the heat exchange tube is the same as that of the left end tube sheet and the left end tube insertion of the heat exchange tube.F. After the lower heat exchange tubes are threaded through the left and right tube sheets, place the upper left support of the first support device above the lower left support, and place the upper right support of the first support device above the lower right support. Then, place the upper first support of the first jack support device above the lower first support, and place the upper second support of the second jack support device above the lower second support. Next, move several first jacks from the lower first support to the upper first support, and move several second jacks from the lower second support to the upper second support. Then, lay the upper heat exchange tubes, completing the threading of the upper heat exchange tubes. The threading method for the upper heat exchange tubes is the same as that for the lower heat exchange tubes.
[0007] Preferably, the heat exchanger tube insertion process in this invention is further configured such that the thickness of the left end tooling plate and the right end tooling plate is 10mm, and the thickness of the left end tube sheet and the right end tube sheet is 250mm.
[0008] Preferably, the heat exchanger tube insertion process in this invention is further configured such that: the diameter of the tube hole in the left end tooling plate is 3mm larger than the diameter of the tube hole in the left end tube sheet, and the diameter of the tube hole in the right end tooling plate is 3mm larger than the diameter of the tube hole in the right end tube sheet;
[0009] Preferably, the heat exchange tube insertion process in this invention is further configured as follows: the first guide tube and the second guide tube have the same structure, both including a main tube section and a conical guide head, and a stepped surface is provided at the connection between the main tube section and the conical guide head.
[0010] Preferably, the heat exchanger tube insertion process of the present invention is further configured such that: the tube hole layout of the left end tooling plate on the left end tooling plate is consistent with the tube hole layout of the left end tube sheet on the left end tube sheet, and the tube hole layout of the right end tooling plate on the right end tooling plate is consistent with the tube hole layout of the right end tube sheet on the right end tube sheet.
[0011] Preferably, the heat exchanger tube insertion process in this invention is further configured as follows: the grid strip includes a transverse grid strip and a longitudinal grid strip, the transverse grid strip and the longitudinal grid strip are arranged perpendicularly, and both the transverse grid strip and the longitudinal grid strip are arranged in a toothed shape and interlocked with each other.
[0012] Compared with the prior art, the present invention has the following advantages: Compared with the prior art of inserting heat exchange tubes one by one into the tube holes of the tube sheet, which is not only inefficient but also prone to bending during the tube insertion process, the present invention first uses a tooling plate to lay the heat exchange tubes, and after the tubes are laid, they are positioned by a grid strip. Then, the tube sheet is fitted onto the heat exchange tubes by a guide tube and a jack, thus completing the tube insertion. This greatly improves the work efficiency and reduces the difficulty of tube insertion. In the present invention, the tube hole size on the tooling plate is 3mm. The ample margin allows for easy insertion of the heat exchange tubes into the tube holes of the tooling plate during installation. Furthermore, since the thickness of the tooling plate is significantly less than that of the tube sheet, there is no interference issue with the inclined sections of the heat exchange tubes during vertical insertion into the tooling plate. This avoids mutual collisions between the heat exchange tubes (the thicker the plate, the greater the stroke of the heat exchange tubes during vertical insertion, making it easier for the inclined sections of the upper and lower heat exchange tubes to collide; the thinner the plate, the smaller the stroke of the heat exchange tubes during vertical insertion, making it less likely for the inclined sections of the upper and lower heat exchange tubes to collide). [Attached Image Description]
[0013] Figure 1 This is a flowchart of the heat exchanger tube insertion process in this invention.
[0014] Figure 2 for Figure 1 A schematic diagram of the first step in the process.
[0015] Figure 3 for Figure 1 A schematic diagram of the second step in the process.
[0016] Figure 4 for Figure 1 A structural diagram of the third step.
[0017] Figure 5 for Figure 1 A structural diagram of the fourth step.
[0018] Figure 6 for Figure 5 A magnified view of a portion of point A in the middle.
[0019] Figure 7 for Figure 5 A magnified view of a section at point B.
[0020] Figure 8 for Figure 1 A structural diagram of step five.
[0021] Figure 9 for Figure 8 A schematic diagram of the structure at point C.
[0022] Figure 10 for Figure 1 A structural diagram of step six.
[0023] Figure 11 is the structural schematic diagram of the seventh step in Figure 1 .
[0024] Figure 12 is the structural schematic diagram of the eighth step in Figure 1 .
[0025] Figure 13 is the structural schematic diagram of the ninth step in Figure 1 .
[0026] Figure 14 is the structural schematic diagram of the tenth step in Figure 1 .
[0027] Figure 15 is the structural schematic diagram after the grid bars in the present invention are fully inserted into the gaps between the heat exchange tubes.
[0028] Figure 16 is the structural schematic diagram of the first guide tube inserted into the left end tube sheet in the present invention.
[0029] Figure 17 is the structural schematic diagram of a single grid bar in the present invention.
[0030] Figures 1 to 17 In
Specific Embodiment
[0031] The following further describes in detail a heat exchange tube threading process according to the present invention through specific embodiments.
[0032] Refer to Figures 1 to 17As shown, a heat exchanger tube insertion process includes the following steps: A. Providing a first support device 1, a first jack support device 2, a second jack support device 3, a baffle 4, a left end tooling plate 5, a right end tooling plate 6, several grid strips 7, several first guide tubes 8, several second guide tubes 9, several first jacks 10, several second jacks 11, a left end tube sheet 12, a right end tube sheet 13, and several heat exchanger tubes 14. The first support device 1 includes an intermediate support mechanism 15 for supporting the heat exchanger tubes 14, a left end support mechanism 16 for supporting the left end tooling plate 5 or the left end tube sheet 12, and a right end support mechanism 17 for supporting the right end tooling plate 6 or the right end tube sheet 13. The left end support mechanism 16 includes a left end lower support part 160 and a left end upper support part 161. The right end support mechanism 17 includes a right end lower support part 17. 0 and the right end upper support part 171, the first jack support device 2 is disposed at the left end of the first support device 1, the first jack support device 2 includes a first lower support 20 and a first upper support 21 disposed above the first lower support 20, the second jack support device 3 is disposed at the right end of the first support device 1, the second jack support device 3 includes a second lower support 30 and a second upper support 31 disposed above the second lower support 30, the left end tooling plate 5 is provided with a plurality of left end tooling plate tube holes, the right end tooling plate 6 is provided with a plurality of right end tooling plate tube holes, the layout of the left end tooling plate tube holes on the left end tooling plate 5 is consistent with the layout of the left end tube plate tube holes on the left end tube plate 12, and the layout of the right end tooling plate tube holes on the right end tooling plate 6 is consistent with the layout of the right end tube plate tube holes on the right end tube plate 13. The diameter of the tube hole in the left tooling plate is larger than the diameter of the tube hole in the left tube sheet, and the diameter of the tube hole in the right tooling plate is larger than the diameter of the tube hole in the right tube sheet. The thickness of the left tooling plate 5 is smaller than the thickness of the left tube sheet 12, and the thickness of the right tooling plate 6 is smaller than the thickness of the right tube sheet 13. In this embodiment, the thickness of both the left tooling plate 5 and the right tooling plate 6 is 10mm, and the thickness of both the left tube sheet 12 and the right tube sheet 13 is 250mm.The diameter of the tube hole in the left end tooling plate is 3mm larger than the diameter of the tube hole in the left end tube sheet, and the diameter of the tube hole in the right end tooling plate is 3mm larger than the diameter of the tube hole in the right end tube sheet; B. First, install the left end tooling plate 5 on the left end lower support part 160 of the left end support mechanism 16 of the first support device 1, and install the right end tooling plate 6 on the right end lower support part 170 of the right end support mechanism 17 of the first support device 1. Then, lay the lower heat exchange tube 14. The heat exchange tube 14 includes a left end through-tube section 141, a right end through-tube section 142, and an arc-shaped part 143 disposed between the left end through-tube section 141 and the right end through-tube section 142. During laying, the heat exchange tube 14... The left end through-tube section 141 of the heat exchange tube 14 is inserted into the tube hole of the left end tooling plate 5, so that the right end through-tube section 142 of the heat exchange tube 14 is inserted into the tube hole of the right end tooling plate 6, and the arc-shaped part 143 of the heat exchange tube 14 is supported on the intermediate support mechanism 15 of the first support device 1; C. Next, a number of grid strips 7 are inserted into the tube gaps of the left end through-tube section 141 of the heat exchange tube 14 in an alternating manner to fix the position and spacing of the left end through-tube section 141. After all the grid strips 7 are inserted, the intersection of the outermost grid strips 7 is spot welded together. Similarly, a number of grid strips 7 are inserted into the right end through-tube section 142 of the heat exchange tube 14 in an alternating manner. The position and spacing of the right-end through-tube section 142 are fixed in the tube gap. After all the grid bars 7 are inserted, the intersections of the outermost grid bars 7 are spot welded together. In this embodiment, the grid bars 7 include horizontal grid bars and vertical grid bars. The horizontal grid bars and vertical grid bars are arranged perpendicularly. Both the horizontal grid bars and vertical grid bars are arranged in a toothed shape and are interlocked. D. After the position and spacing of the left-end through-tube section 141 and the position and spacing of the right-end through-tube section 142 are fixed by the grid bars 7, the left-end tooling plate 5 and the right-end tooling plate 6 are removed from the first support device 1 respectively. Then, all heat exchange tubes 14 The left end tube section 141 and the right end tube section 142 are polished and derusted. After the treatment, the sleeves are fitted one by one onto the left end tube section 141 and the right end tube section 142 of each heat exchange tube 14 to check whether there are burrs or other factors that are not conducive to tube insertion on the surface of the tube section; E. Then the left end tube plate 12 is installed on the left end lower support part 160 of the left end support mechanism 16 of the first support device 1, and several first guide tubes 8 are inserted into the tube holes of the left end tube plate 12. The first guide tube 8 includes a main tube part 80 and a tapered guide head 81. The connection between the main tube part 80 and the tapered guide head 81 is provided with a stepped surface 82.The tapered guide head 81 of the first guide tube 8 is inserted into the left end through-tube section 141 of the heat exchange tube 14, and the stepped surface 82 of the tapered guide head 81 of the first guide tube 8 abuts against the end face of the left end through-tube section 141. The right end tube plate 13 is installed on the right end lower support part 170 of the right end support mechanism 17 of the first support device 1, and several second guide tubes 9 are inserted into the tube holes of the right end tube plate 13. The structure of the second guide tube 9 is the same as that of the first guide tube 8, so it will not be described again here. The tapered guide head of the second guide tube 9 is inserted into the right end through-tube section 142 of the heat exchange tube 14, and the stepped surface of the tapered guide head of the second guide tube 9 abuts against the end face of the right end through-tube section 142. With the surfaces facing each other, the first lower support 20 of the first jack support device 2 is placed on the left end of the first support device 1, and the second lower support 30 of the second jack support device 3 is placed on the right end of the first support device 1. Then, several first jacks 10 are installed on the first lower support 20 of the first jack support device 2, and several second jacks 11 are installed on the second lower support 30 of the second jack support device 3. Then, the tail end of the second guide tube 9 is blocked by a baffle 4, and the baffle 4 is supported by several second jacks 11. The advantage of this arrangement is that when the first jacks 10 push the left end tube plate 12 to the right, the right end tube section 142 of the heat exchange tube 14 can be prevented from shifting.Then, several first jacks 10 work simultaneously to push the left end tube sheet 12 to the right. The first guide tube 8, supported by the left end through-tube section 141, gradually extends from the rear end of the left end tube sheet 12. When the distance from the left end through-tube section 141 into the tube hole of the left end tube sheet reaches 5mm, the first jacks 10 stop working, and the left end tube sheet 12 stops moving to the right. On-site personnel then pull out all the first guide tubes 8 from behind the left end tube sheet 12. After all the first guide tubes 8 have been pulled out, the first jacks 10 continue working, continuing to push the left end tube sheet 12. Move to the right until the left end of the heat exchange tube 14, the tube section 141, is completely inserted into the tube hole of the left end tube sheet. After the tube insertion is completed on the left end tube sheet 12, remove the grid strips 7 that are inserted into the gaps between the tubes of the left end tube section 141 by grinding the weld points on the outer ring of the grid strips 7. After the tube insertion of the left end tube section 141 and the left end tube sheet 12 is completed, remove the baffle 4 that was originally placed on the right and place it on the left to block the end of the heat exchange tube 14. Then, use several second jacks 11 to push the right end tube sheet 13 to the left to complete the insertion of the right end tube sheet 13 and the heat exchange tube. The pipe insertion method of the right end pipe section 142 of the heat exchange tube 14 is the same as that of the left end pipe section 141 of the heat exchange tube 14 and the right end tube plate 13. F. After the heat exchange tube 14, left end tube plate 12, and right end tube plate 13 are all inserted, place the left end upper support part 161 of the first support device 1 above the left end lower support part 160, place the right end upper support part 171 of the first support device 1 above the right end lower support part 170, and place the first jack support device 2... An upper support 21 is erected above a first lower support 20. The second upper support 31 of the second jack support device 3 is erected above the second lower support 30. Then, several first jacks 10 are moved from the first lower support 20 to the first upper support 21, and several second jacks 11 are moved from the second lower support 30 to the second upper support 31. Then, the upper heat exchange tubes 14 are laid, and finally, the upper heat exchange tubes 14 are installed. The installation method of the upper heat exchange tubes 14 is the same as that of the lower heat exchange tubes 14.
[0033] In summary, this invention employs a method where the heat exchange tubes are first laid out using a tooling plate, then positioned using grid strips, and finally, a tube sheet is fitted onto the heat exchange tubes using a guide tube and a jack, completing the tube insertion process. This significantly improves work efficiency and reduces the difficulty of tube insertion. Furthermore, because the tooling plate has a 3mm margin for the tube holes, the heat exchange tubes can be easily inserted into the tooling plate during installation. Additionally, since the tooling plate is significantly thinner than the tube sheet, there is no interference between the oblique sections of the heat exchange tubes during vertical insertion into the tooling plate, thus avoiding collisions between the tubes and solving the problem of easy bending of the heat exchange tubes during insertion in existing technologies.
[0034] The above embodiments are merely illustrative of the principles and effects of the present invention, as well as some examples of its application, and are not intended to limit the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the inventive concept of the present invention, and these modifications and improvements are all within the scope of protection of the present invention.
Claims
1. A heat exchanger tube insertion process, characterized in that: Includes the following steps: A. Provides a first support device, a first jack support device, a second jack support device, a baffle, a left end tooling plate, a right end tooling plate, several grid strips, several first guide tubes, several second guide tubes, several first jacks, several second jacks, a left end tube sheet, a right end tube sheet, and several heat exchange tubes. The first support device includes an intermediate support mechanism for supporting the heat exchange tubes, a left end support mechanism for supporting the left end tooling plate or the left end tube sheet, and a right end support mechanism for supporting the right end tooling plate or the right end tube sheet. The left end support mechanism includes a lower left end support portion and an upper left end support portion. The right end support mechanism includes a lower right end support portion and an upper right end support portion. The first jack support device is disposed on the first support device. At the left end of the support device, the first jack support device includes a first lower support and a first upper support disposed above the first lower support. The second jack support device is disposed at the right end of the first support device. The second jack support device includes a second lower support and a second upper support disposed above the second lower support. The left end tooling plate has a plurality of left end tooling plate tube holes, and the right end tooling plate has a plurality of right end tooling plate tube holes. The diameter of the left end tooling plate tube holes is larger than the diameter of the left end tube plate tube holes, and the diameter of the right end tooling plate tube holes is larger than the diameter of the right end tube plate tube holes. The thickness of the left end tooling plate is smaller than the thickness of the left end tube plate, and the thickness of the right end tooling plate is smaller than the thickness of the right end tube plate. B. First, install the left end tooling plate on the left end lower support part of the left end support mechanism of the first support device, and install the right end tooling plate on the right end lower support part of the right end support mechanism of the first support device. Then, lay the lower layer of heat exchange tubes. The heat exchange tubes include a left end through-tube section, a right end through-tube section, and an arc-shaped part set between the left end through-tube section and the right end through-tube section. When laying, the left end through-tube section of the heat exchange tube passes through the tube hole of the left end tooling plate of the left end tooling plate, and the right end through-tube section of the heat exchange tube passes through the tube hole of the right end tooling plate of the right end tooling plate, so that the arc-shaped part of the heat exchange tube is supported on the middle support mechanism of the first support device. C. Next, insert several grid strips in an alternating pattern into the gaps between the tubes of the left end of the heat exchange tube to fix the position and spacing of the left end tube section. After all the grid strips have been inserted, spot weld the intersections of the outermost grid strips. Similarly, insert several grid strips in an alternating pattern into the gaps between the tubes of the right end of the heat exchange tube to fix the position and spacing of the right end tube section. After all the grid strips have been inserted, spot weld the intersections of the outermost grid strips. D. After the position and spacing of the left end pipe section and the position and spacing of the right end pipe section are fixed by the grid strip, remove the left end tooling plate and the right end tooling plate from the first support device respectively. Then polish and remove rust from the left end pipe section and the right end pipe section of all heat exchange tubes. After the treatment, use a sleeve to put on the left end pipe section and the right end pipe section of each heat exchange tube to check whether there are burrs on the surface of the pipe section. E. Then, install the left end tube sheet onto the lower left support of the left end support mechanism of the first support device, and insert several first guide tubes into the tube holes of the left end tube sheet. The conical guide head of the first guide tube is inserted into the left end through-tube section of the heat exchange tube, and the stepped surface of the conical guide head of the first guide tube abuts against the end face of the left end through-tube section. Install the right end tube sheet onto the lower right support of the right end support mechanism of the first support device, and insert several second guide tubes into the tube holes of the right end tube sheet. The conical guide head of the second guide tube is inserted into the heat exchange tube. The right end of the pipe passes through the pipe section, and the stepped surface at the conical guide head of the second guide pipe abuts against the end face of the right end of the pipe section. The first lower support of the first jack support device is erected on the left end of the first support device, and the second lower support of the second jack support device is erected on the right end of the first support device. Then, several first jacks are installed on the first lower support of the first jack support device, and several second jacks are installed on the second lower support of the second jack support device. Next, a baffle is used to block the tail end of the second guide pipe, and the baffle is formed by several second jacks... The first jack is then used to push the left tube sheet to the right simultaneously. Supported by the left-end tube section, the first guide tube gradually extends from the rear of the left tube sheet. When the distance between the left-end tube section and the tube hole in the left tube sheet reaches 5mm, the first jack stops working, and the left tube sheet stops moving to the right. On-site personnel then pull out all the first guide tubes from the rear of the left tube sheet. After all the first guide tubes are pulled out, the first jacks continue to work, pushing the left tube sheet to the right until the left-end tube section of the heat exchanger tube is completely inserted into the left tube. After the tubes are inserted into the tube sheet at the left end, the grid strips inserted into the gaps between the tubes in the left end tube section are removed by grinding the weld points on the outer ring of the grid strips. After the tubes are inserted into the left end tube section and the left end tube sheet, the baffle originally placed on the right is removed and placed on the left to block the end of the heat exchange tube. Then, the right end tube sheet is moved to the left by several second jacks at the same time to complete the insertion of the tubes into the right end tube sheet and the right end tube section of the heat exchange tube. The insertion method of the right end tube sheet and the right end tube section of the heat exchange tube is the same as the insertion method of the left end tube sheet and the left end tube section of the heat exchange tube. F. After the lower heat exchange tubes are threaded through the left and right tube sheets, place the upper left support of the first support device above the lower left support, place the upper right support of the first support device above the lower right support, set up the upper first jack support above the lower first jack support, set up the upper first jack support above the lower first jack support, set up the upper second jack support above the lower second jack support, then move several first jacks from the lower first jack support to the upper first jack support, and move several second jacks from the lower second jack support to the upper second jack support. Then lay the upper heat exchange tubes, and finally complete the threading of the upper heat exchange tubes. The threading method of the upper heat exchange tubes is the same as that of the lower heat exchange tubes.
2. The heat exchanger tube insertion process as described in claim 1, characterized in that: The thickness of the left and right tooling plates is 10mm, and the thickness of the left and right tube plates is 250mm.
3. The heat exchanger tube insertion process as described in claim 1, characterized in that: The diameter of the tube hole in the left tooling plate is 3mm larger than the diameter of the tube hole in the left tube sheet, and the diameter of the tube hole in the right tooling plate is 3mm larger than the diameter of the tube hole in the right tube sheet.
4. The heat exchanger tube insertion process as described in claim 1, characterized in that: The first guide tube and the second guide tube have the same structure, both including a main tube and a tapered guide head, and the connection between the main tube and the tapered guide head is provided with a stepped surface.
5. The heat exchanger tube insertion process as described in claim 1, characterized in that: The layout of the tube holes on the left tooling plate is consistent with the layout of the tube holes on the left tube sheet, and the layout of the tube holes on the right tooling plate is consistent with the layout of the tube holes on the right tube sheet.
6. The heat exchanger tube insertion process as described in claim 1, characterized in that: The grid strips include horizontal grid strips and vertical grid strips, which are arranged perpendicularly to each other. Both the horizontal and vertical grid strips are arranged in a toothed shape and are interlocked.
Citation Information
Patent Citations
Automatic tube penetrating method for heat exchanger tube bundle
CN111805219A
Heat exchange tube penetrating tool
CN117532536A