Pipe end structure for heat exchanger
By adopting end plates, tube bundles and side-by-side heat insulation plate structures in tube heat exchangers, the problem of prone to cracking of welding joints is solved, the connection strength and service life are improved, and the thermal insulation performance is enhanced.
Patent Information
- Application Number
- CN202323604034.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-12-27
- Publication Date
- 2024-12-13
- Estimated Expiration
- 2033-12-27
AI Technical Summary
In existing tube heat exchangers, the welding joints between the tube bundles and the tube plate are susceptible to periodic air pressure and thermal stress, resulting in cracks in the welding joints and affecting the service life of the equipment.
Adopt a pipe end structure including an end plate, a tube bundle and a plurality of thermal insulation plates arranged side by side along the direction of the expansion of the tube bundle. A welded seam is formed between the thermal insulation plate and the tube bundle, and fixed by bolts to increase impact resistance and thermal insulation properties to prevent gas. and heat reaches the solder joint.
It effectively reduces the impact of air pressure changes and thermal stress on welding joints, improves the strength of the connection between the tube bundle and the tube plate, extends the service life of the heat exchanger, and enhances the thermal insulation performance.
Smart Images
Figure CN222165827U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of heat exchangers, in particular to a tube end structure for a heat exchanger. Background Art
[0002] A heat exchanger is an energy-saving device that realizes heat transfer between materials, mainly including tubular heat exchangers, plate heat exchangers, rotary heat exchangers, etc.
[0003] The existing tubular heat exchanger includes a shell, a tube bundle and a tube sheet arranged in the shell, and the two ends of the tube bundle are fixed to the tube sheet by welding. However, in actual use, it is found that the tube bundle will radiate heat to the outside during use, causing other changes inside the heat exchanger, and then causing the air pressure in the gap between the tube bundle and the tube sheet to change. The welds between the tube bundle and the tube sheet are subjected to periodic tensile and compressive stresses and thermal stresses, which causes cracks in the material at the welds.
[0004] Therefore, this field needs a new technical solution to solve the above problems. Summary of the invention
[0005] In order to improve or solve the technical problem of cracking and failure of the welding points between the tube bundle and the tube sheet in the prior art, the utility model provides a tube end structure for a heat exchanger. The tube end structure includes: an end plate, which is provided with a receiving groove and has a first side facing away from the inside of the heat exchanger; a tube bundle, which is arranged in the receiving groove and forms a clearance fit with the receiving groove; the tube bundle has a first end extending out of the first side; a heat insulation plate, which is fixed on the first side; the heat insulation plate is sleeved on the circumferential outer side of the tube bundle, and a plurality of heat insulation plates are arranged side by side along the extension direction of the tube bundle; a welding seam is formed between the heat insulation plate near the first end and the tube bundle, and the welding seam is arranged on the side of the heat insulation plate facing away from the end plate.
[0006] In the tube end structure used for the heat exchanger of the utility model, it includes an end plate, a tube bundle and a heat insulation plate. Among them, the end plate is used to fix the tube bundle, and the tube bundle is used to transport the cooling medium. The heat insulation plate is arranged on the first side and multiple ones are arranged side by side along the extension direction of the tube bundle, which can block the gas in the gap between the end plate and the tube bundle from impacting the outermost heat insulation plate. A welding seam is formed between the heat insulation plate near the first end and the tube bundle, and the welding seam is arranged at the end of the heat insulation plate facing away from the end plate, which can further block the gas from impacting the welding seam and avoid cracks in the welding points on the welding seam. At the same time, the heat insulation plate can also block the hot gas from spreading to the welding points, further avoiding cracks in the welding points on the welding seam. Through the above-mentioned settings, the tube end structure used for the heat exchanger of the utility model can reduce the influence of the air pressure change and thermal stress in the heat exchanger on the welding points between the tube sheet and the tube bundle, improve the connection strength between the tube bundle and the tube sheet, and thus improve the service life of the heat exchanger.
[0007] In the preferred technical solution of the tube end structure for the heat exchanger, a plurality of the insulation boards are arranged at intervals. Through the above arrangement, the insulation boards are arranged at intervals so that the insulation boards have better impact resistance and heat insulation performance, and further avoid cracks in the welds on the welds.
[0008] In the preferred technical solution of the tube end structure for the heat exchanger, a first gasket is arranged between adjacent heat insulation boards. Through the above arrangement, the heat insulation boards are spaced apart by the gasket, which has a simple structure and is easy to use.
[0009] In the preferred technical solution of the tube end structure for the heat exchanger, the heat insulation board includes a first heat insulation board close to the first end and a second heat insulation board far from the first end, and a second gasket is arranged between the second heat insulation board and the end plate. Through the above arrangement, the two heat insulation boards have a good heat insulation effect; the second gasket is arranged between the second heat insulation board and the end plate, which can buffer and protect the second heat insulation board and avoid damage to the second heat insulation board.
[0010] In the preferred technical solution of the tube end structure for the heat exchanger, the first heat insulation board and the second heat insulation board are fixed to the end plate by bolts. Through the above arrangement, the bolt fixing structure is simple, convenient and has strong stability.
[0011] In the preferred technical solution of the tube end structure for the heat exchanger, the thickness of the heat insulation board is 0.5mm-2mm. Through the above configuration, the thickness of the heat insulation board is 0.5mm-2mm, which can take into account both weight and heat insulation, and has a high cost performance.
[0012] In the preferred technical solution of the tube end structure for the heat exchanger, a heat insulation coating is applied on the heat insulation board. Through the above arrangement, the heat insulation coating can enhance the heat insulation performance of the heat insulation board, block the spread of hot air to the welding point, and avoid cracks in the welding point on the welding seam. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings, in which:
[0014] Figure 1 It is a schematic diagram of an embodiment of the tube end structure of the utility model for a heat exchanger.
[0015] Figure 2 yes Figure 1 A magnified schematic diagram of center A.
[0016] List of reference numerals: 1. end plate; 11. receiving groove; 12. first side; 13. second side; 2. tube bundle; 21. first end; 3. insulation board; 31. first insulation board; 32. second insulation board; 33. first gasket; 34. second gasket; 35. bolt; 36. weld seam. DETAILED DESCRIPTION
[0017] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.
[0018] It should be noted that in the description of the present invention, the terms "upper", "lower", "left", "right", "inner", "outer" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings, which are only for the convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.
[0019] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installation", "setting", and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, an indirect connection through an intermediate medium, or the internal connection of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0020] In order to improve or solve the technical problem of cracking and failure of the welding points between the tube bundle and the tube sheet in the prior art, the utility model provides a tube end structure for a heat exchanger. The tube end structure includes: an end plate 1, which is provided with a receiving groove 11 and has a first side surface 12 facing away from the inside of the heat exchanger; a tube bundle 2, which is arranged in the receiving groove 11 and forms a clearance fit with the receiving groove 11; the tube bundle 2 has a first end 21 extending out of the first side surface 12; a heat insulation board 3, which is fixed on the first side surface 12; the heat insulation board 3 is sleeved on the circumferential outer side of the tube bundle 2, and a plurality of heat insulation boards 3 are arranged side by side along the extension direction of the tube bundle 2; a welding seam 36 is formed between the heat insulation board 3 near the first end 21 and the tube bundle 2, and the welding seam 36 is arranged on the side of the heat insulation board 3 facing away from the end plate 1.
[0021] Figure 1 It is a schematic diagram of an embodiment of the tube end structure of the utility model for a heat exchanger; Figure 2 yes Figure 1 The enlarged schematic diagram of A in the figure. Figure 1 and Figure 2 As shown, the tube end structure of the heat exchanger of the utility model comprises: an end plate 1, a tube bundle 2 and a heat insulation plate 3.
[0022] See also Figure 1 The end plate 1 is arranged in the heat exchanger and close to one end of the heat exchanger for fixing the tube bundle 2. In one or more embodiments, the end plate 1 is roughly circular, and a receiving groove 11 is provided on the end plate 1. The receiving groove 11 penetrates the end plate 1. Further, the end plate 1 has a first side surface 12 and a second side surface 13 opposite to each other. The first side surface 12 faces away from the middle of the heat exchanger, and the second side surface 13 faces the middle of the heat exchanger.
[0023] Continue to see Figure 1 In one or more embodiments, a plurality of tube bundles 2 are arranged, and each tube bundle 2 is arranged in a corresponding receiving groove 11. The diameter of the receiving groove 11 is slightly larger than the diameter of the tube bundle 2, so that the receiving groove 11 and the tube bundle 2 form a clearance fit, so that the hot gas inside the heat exchanger can extend toward the end plate 1. The tube bundle 2 has a first end 21, which passes through the receiving groove 11 and extends out of the first side surface 12. It can be understood that the end plates 1 are arranged at both ends of the heat exchanger, and both ends of the tube bundle 2 can be the first ends 21.
[0024] See also Figure 1 and Figure 2 , the heat insulation board 3 is arranged on the first side surface 12. In one or more embodiments, the heat insulation board 3 is roughly circular plate-shaped and is similar in shape and size to the end plate 1. The heat insulation board 3 is sleeved on the circumferential outer side of the tube bundle 2, and multiple heat insulation boards 3 are arranged side by side along the extension direction of the tube bundle 2 to enhance the heat insulation and impact resistance. Further, multiple heat insulation boards 3 are arranged at intervals. Specifically, a first gasket 33 is arranged between adjacent heat insulation boards 3, and the first gasket 33 can space two adjacent heat insulation boards 3.
[0025] Continue to see Figure 1 and Figure 2, there are two heat insulation boards 3, namely, a first heat insulation board 31 and a second heat insulation board 32, the first heat insulation board 31 is close to the first end 21 and away from the end plate 1, and the second heat insulation board 32 is away from the first end 21 and close to the end plate 1. Alternatively, the heat insulation board 3 can also be provided in three, four or other suitable numbers. In one or more embodiments, a second gasket 34 is provided between the second heat insulation board 32 and the end plate 1, and the second gasket 34 can buffer and protect the second heat insulation board 32 to avoid damage to the second heat insulation board 32. Further, the first heat insulation board 31 and the second heat insulation board 32 are fixed to the end plate 1 by bolts 35. Specifically, a bolt 35 hole is provided on the end plate 1, and the bolt 35 passes through the first heat insulation board 31, the first gasket 33, the second heat insulation board 32 and the second gasket 34 in sequence and cooperates with the bolt 35 hole. Further, the thickness of the first heat insulation board 31 and the second heat insulation board 32 is uniform 0.5mm-2mm, and the thickness of the two is the same. Preferably. The thickness of the first insulation board 31 and the second insulation board 32 is uniformly 1 mm. Alternatively, the thickness of the first insulation board 31 and the second insulation board 32 is different. For example, the first insulation board 31 is set to 0.5 mm, and the second insulation board 32 is set to 2 mm. Further, the thickness of the first gasket 33 is 1 mm, and the thickness of the second gasket 34 is 4 mm. Alternatively, the thickness of the first gasket 33 and the thickness of the second gasket 34 can be adjusted according to actual needs. Further, the tube bundle 2 is fixed to the second insulation board 32 by welding, and a welding seam 36 is formed. The welding seam 36 extends along the circumference of the tube bundle 2 and is arranged on the side of the second insulation board 32 facing away from the first insulation board 31. Further, a thermal insulation coating is also applied on the first insulation board 31 and the second insulation board 32. Preferably, the thermal insulation coating is a gypsum-based fireproof coating, and covers the entire first insulation board 31 and the second insulation board 32.
[0026] So far, the technical scheme of the present invention has been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical schemes after these changes or substitutions will fall within the protection scope of the present invention.
Claims
1. A tube end structure for a heat exchanger, characterized in that: include: The end plate (1) is provided with a receiving groove (11) and has a first side surface (12) facing away from the interior of the heat exchanger; A tube bundle (2) is arranged in the receiving groove (11) and forms a clearance fit with the receiving groove (11); the tube bundle (2) has a first end (21) extending out of the first side surface (12); A heat insulation plate (3) is fixed on the first side surface (12); the heat insulation plate (3) is sleeved on the circumferential outer side of the tube bundle (2), and a plurality of the heat insulation plates (3) are arranged side by side along the extension direction of the tube bundle (2); a welding seam (36) is formed between the heat insulation plate (3) and the tube bundle (2) near the first end (21), and the welding seam (36) is arranged on the side of the heat insulation plate (3) facing away from the end plate (1).
2. The tube end structure for a heat exchanger according to claim 1, characterized in that: A plurality of the heat insulation panels (3) are arranged at intervals.
3. The tube end structure for a heat exchanger according to claim 2, characterized in that: A first gasket (33) is arranged between adjacent heat insulation plates (3).
4. The tube end structure for a heat exchanger according to claim 1, characterized in that: The heat insulation board (3) comprises a first heat insulation board (31) close to the first end (21) and a second heat insulation board (32) away from the first end (21), and a second gasket (34) is arranged between the second heat insulation board (32) and the end plate (1).
5. The tube end structure for a heat exchanger according to claim 4, characterized in that: The first heat insulation plate (31) and the second heat insulation plate (32) are fixed to the end plate (1) by bolts (35).
6. The tube end structure for a heat exchanger according to claim 1, characterized in that: The thickness of the heat insulation board (3) is 0.5 mm-2 mm.
7. The tube end structure for a heat exchanger according to claim 1, characterized in that: A heat insulation coating is applied on the heat insulation board (3).