U-tube heat exchanger with u-shaped housing
By combining a U-shaped shell and an independent tube sheet manifold, the structural failure problem caused by the temperature difference between hot and cold fluids in the U-tube heat exchanger was solved, thereby reducing thermal stress and improving heat exchange efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SUZHOU SANCHUAN HEAT EXCHANGER CO LTD
- Filing Date
- 2025-07-03
- Publication Date
- 2026-07-24
AI Technical Summary
When the inlet and outlet of the hot and cold fluids correspond to the same tube sheet area in the existing U-tube heat exchanger, a large temperature difference is caused, which leads to non-uniform expansion of the tube sheet and thermal stress concentration, posing a risk of structural failure.
The design employs a U-shaped shell and two independent tube sheet manifolds, allowing hot and cold fluids to flow in different media channels. Insulation gaskets reduce temperature differences, and baffles improve heat exchange efficiency.
It effectively reduces the thermal stress on both sides of the tube sheet, reduces the risk of structural failure, improves heat exchange efficiency, and extends the service life of the equipment.
Smart Images
Figure CN224552162U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of heat exchanger technology, specifically to a U-tube heat exchanger with a U-shaped shell. Background Technology
[0002] U-tube heat exchangers are widely used in chemical, energy and other fields due to their compact structure and strong thermal compensation capabilities. Conventional U-tube heat exchangers use a straight cylindrical shell, with both the inlet and outlet of the hot and cold fluids arranged on the same tube sheet. Their core advantages lie in their simple structure (eliminating a tube sheet and floating head components), low manufacturing cost, and the fact that the U-shaped tube bundle can freely expand and contract, effectively solving the problem of limited expansion of heat exchange tubes in heat exchangers with fixed tube sheets at both ends.
[0003] However, in actual operation, this structure still has the following shortcomings:
[0004] The inlet and outlet of the tube-side fluid correspond to adjacent regions on the same tube sheet, resulting in a significant temperature difference (up to 100°C or more in extreme cases) between the two sides of the interface. This causes non-uniform expansion of the tube sheet, leading to enormous thermal stress. Combined with the influence of structural geometric discontinuities, thermal stress concentration is substantial, posing a high risk of structural failure.
[0005] Therefore, how to overcome the shortcomings of the existing technology mentioned above has become the subject of this utility model. Utility Model Content
[0006] This invention provides a U-tube heat exchanger with a U-shaped shell, which aims to solve the technical problems mentioned in the background art.
[0007] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a U-shaped tube heat exchanger with a U-shaped shell, comprising a U-shaped heat exchange tube, a U-shaped shell, and a two-tube sheet manifold assembly; the U-shaped shell is U-shaped, and the U-shaped heat exchange tube is disposed inside the U-shaped shell, with the spatial orientation of the U-shaped heat exchange tube matching the inner contour of the U-shaped shell cavity; the two ends of the U-shaped heat exchange tube are respectively connected to corresponding tube holes on the tube sheet manifold assembly; the two open ends of the U-shaped shell are welded to two corresponding tube sheet manifold assemblies; the two... A partition space is provided between the tube sheet manifold assemblies; the U-shaped shell is provided with a medium inlet and a medium outlet that connect the inner cavity of the U-shaped shell, and the medium flows through the medium inlet, the space between the inner wall of the U-shaped shell and the outer wall of the U-shaped heat exchange tube to the medium outlet, forming a first medium flow channel; one of the two tube sheet manifold assemblies is provided with a second medium inlet and the other is provided with a second medium outlet, and the second medium flow channel is formed by the second medium inlet, the tube sheet manifold assembly corresponding to the second medium inlet, the inner cavity of the U-shaped heat exchange tube, the other manifold, and the second medium outlet.
[0008] The relevant content in the above plan is explained as follows:
[0009] In the above solution, unlike the straight cylindrical shell in the prior art which creates a large temperature difference on both sides of the tube sheet, this application uses two independent headers to separate the cold end and the hot end. This avoids the disadvantage of the cold and hot fluids forming a large temperature difference on both sides of the same tube sheet in ordinary U-tube heat exchangers, and also avoids the problem of difficult coordination between the expansion of the shell and the heat exchange tubes in ordinary shell and tube heat exchangers.
[0010] In the above scheme, the U-shaped shell is U-shaped and has two open ends facing the same side.
[0011] In the above scheme, the disadvantage of a large temperature difference between the hot and cold fluids on both sides of the same tube sheet can be avoided by the cooperation of the U-shaped shell and the two tube sheet manifold assemblies. Specifically, the two open ends of the U-shaped shell are directly guided to be sealed and connected to the two tube sheet manifold assemblies one by one. In this way, the first medium will flow in the first medium flow channel and the second medium will flow in the second medium flow channel. Since there is a separation space, the heat between the two tube sheet manifold assemblies can be separated.
[0012] A further technical solution involves a tube sheet and a header assembly comprising a tube sheet and a header, the header including a flange, an end cap, and a connecting pipe; one side of the tube sheet is sealed to the open end of the U-shaped shell, and the other side is fastened to the flange of the header by a sealing ring and bolts; the side of the flange away from the tube sheet is sealed and welded to the end cap, and the end face of the tube sheet and the inner wall of the end cap together define a converging chamber for the convergence or distribution of a second medium; the connecting pipe communicates with the end cap, and the port of the connecting pipe serves as the inlet or outlet of the second medium; the end of the U-shaped heat exchange tube passes through the tube sheet and is sealed to it, and communicates with the converging chamber.
[0013] With the above design, the tube sheet and manifold can respectively achieve the purpose of sealing the opening end of the U-shaped shell and guiding the medium to flow in the second medium flow channel.
[0014] Specifically, one side of the tube sheet is sealed to the open end of the U-shaped shell, and the other side is sealed to the flange of the header (the connection method is bolt connection). Then, the end of the U-shaped heat exchange tube is guided through the tube sheet and sealed to it, and then extends into the converging chamber. At this time, the medium flows through the medium inlet, the inner wall of the U-shaped shell and the space outside the U-shaped heat exchange tube to the medium outlet, forming a first medium flow channel. That is to say, the first medium will flow in the first medium flow channel, and at the same time, the second medium is guided to enter one of the converging chambers through the second medium inlet. Therefore, the second medium will flow in the second medium flow channel, then flow into another converging chamber and be discharged from the second medium outlet.
[0015] A further technical solution includes a tube sheet body, a heat insulation gasket, and a pressure plate arranged sequentially along the axial direction from the outside to the inside of the U-shaped shell opening; the tube sheet body has an inner surface and an outer surface arranged opposite to each other; the heat insulation gasket and the pressure plate are both located inside the U-shaped shell, and the heat insulation gasket is arranged close to the inner surface of the tube sheet body; the heat insulation gasket is configured to reduce the heat transfer of the first medium to the outside of the tube sheet body.
[0016] In the above scheme, the U-shaped heat exchange tube passes through the pressure plate and the heat insulation gasket and is connected to the tube sheet in a way that is both airtight and strong (the seal can be achieved by means of expansion, welding or sealing gaskets).
[0017] With the above design, the temperature difference between the hot and cold sides and the inner and outer surfaces of the tube sheet can be reduced simultaneously, thereby reducing the thermal stress in the hot and cold areas and between the inner and outer surfaces of the tube sheet. It also prevents excessive temperature from forming around the opening end of the U-shaped shell. Specifically, because the heat insulation gasket is located inside the opening end of the U-shaped shell and is tightly attached to the inner surface of the tube sheet body, the temperature of the first medium flowing in the first medium flow channel will not be significantly transferred to the outside. Furthermore, because the heat insulation gasket and the interior of the U-shaped shell are fitted with an interference fit, the heat transferred by the second medium to the tube sheet body will not be transferred to the periphery of the opening end of the U-shaped shell.
[0018] The thermal insulation pad is made of thermal insulation materials such as polymer-based composite materials (low-temperature medium) and ceramic fibers (high-temperature medium). Its thermal insulation effect greatly reduces the temperature difference between the two sides of the tube sheet, which reduces the thermal stress of the two sides of the tube sheet. At the same time, it also reduces the risk of structural failure caused by stress corrosion and stress cracking of the tube sheet, thereby extending the service life of the equipment.
[0019] In a further technical solution, the shape of the pressure plate is matched with the shape of the heat insulation pad.
[0020] In a further technical solution, multiple U-shaped heat exchange tubes are provided, and these multiple U-shaped heat exchange tubes are combined to form a tube bundle structure by baffles arranged inside the U-shaped shell.
[0021] The above design enables higher heat exchange efficiency between the first and second media.
[0022] In a further technical solution, the heat insulation pad is provided with a through hole for guiding the U-shaped heat exchange tube into the converging chamber.
[0023] The above design allows the U-shaped heat exchange tube to extend into the converging chamber through the through-hole. Furthermore, a sealing element or other structure can be installed at the end of the through-hole to achieve a seal.
[0024] It should be noted that the through holes are the corresponding pipe holes on the aforementioned tube sheet manifold assembly. Through holes are provided throughout the entire tube sheet.
[0025] A further technical solution involves providing a plurality of baffles in the space between the inner wall of the U-shaped shell and the outer wall of the U-shaped heat exchange tube, with all the baffles spaced apart along a direction perpendicular to the axis of the U-shaped heat exchange tube.
[0026] With the above design, when the first medium flows inside the U-shaped shell, it can flow fully under the guidance of the baffles, thereby improving the heat exchange efficiency between it and the second medium.
[0027] The specific arrangement of the baffles is as follows: the baffles adopt a circular structure with planar notches. During the arrangement, the notches of adjacent baffles are alternately arranged so that they face the inner and outer sides of the U-shaped heat exchange tube, thereby guiding the first medium to flow fully.
[0028] The terms "first," "second," etc., used in this article do not specifically refer to order or sequence, nor are they intended to limit this case; they are merely used to distinguish components or operations described using the same technical terms.
[0029] The terms "connection" or "positioning" as used in this article can refer to two or more components or devices making direct physical contact with each other, or making indirect physical contact with each other, or to two or more components or devices operating or moving with each other.
[0030] The terms “include,” “including,” and “have” used in this article are all open-ended, meaning they include but are not limited to.
[0031] Unless otherwise specified, the terms used herein generally have their ordinary meaning in the context of the art, the subject matter, and the specific context. Certain terms used to describe this case will be discussed below or elsewhere in this specification to provide additional guidance to those skilled in the art in describing the case.
[0032] The terms “front,” “back,” “up,” “down,” “left,” and “right” used in this article are directional terms. In this case, they are only used to describe the positional relationship between the structures and are not intended to limit the specific direction of the protection scheme or its actual implementation.
[0033] The working principle and advantages of this utility model are as follows:
[0034] This invention avoids the drawback of large temperature differences between hot and cold fluids on both sides of the same tube sheet in ordinary U-tube heat exchangers by using a U-shaped shell and two tube sheet manifold assemblies. Specifically, the two open ends of the U-shaped shell are directly guided to be sealed and connected to the two tube sheet manifold assemblies one by one. In this way, the first medium flows in the first medium flow channel and the second medium flows in the second medium flow channel. Due to the existence of the separation space, the heat between the two tube sheet manifold assemblies can be separated. Attached Figure Description
[0035] Appendix Figure 1 This is a schematic diagram of the overall structure in an embodiment of the present utility model;
[0036] Appendix Figure 2 This is a schematic diagram of the converging chamber structure in an embodiment of the present utility model;
[0037] Appendix Figure 3 This is a schematic diagram of the manifold structure in an embodiment of the present utility model.
[0038] In the above attached figures: 1. U-shaped heat exchange tube; 2. U-shaped shell; 3. Medium inlet; 4. Medium outlet; 5. Manifold; 6. Tube sheet; 7. Flange; 8. End cap; 9. Converging chamber; 10. Tube sheet body; 11. Insulation gasket; 12. Pressure plate; 13. Tube bundle structure; 14. Through hole; 15. Baffle plate; 16. Second medium inlet; 17. Second medium outlet; 18. Connecting pipe; 19. Tube sheet and manifold assembly. Detailed Implementation
[0039] The present invention will be further described below with reference to the accompanying drawings and embodiments:
[0040] Example: The present invention will be clearly described below with illustrations and detailed description. Any person skilled in the art who understands the examples of the present invention can make changes and modifications based on the technology taught in the present invention without departing from the spirit and scope of the present invention.
[0041] The terminology used herein is for the purpose of describing specific embodiments only and is not intended to limit the scope of this work. Singular forms such as “a,” “this,” “this,” “the,” and “the” as used herein also include plural forms.
[0042] See appendix Figures 1-3As shown, a U-tube heat exchanger with a U-shaped shell includes a U-shaped heat exchange tube 1, a U-shaped shell 2, and a two-tubesheet manifold assembly 19. The U-shaped shell 2 is U-shaped, and the U-shaped heat exchange tube 1 is disposed inside the U-shaped shell 2. The spatial orientation of the U-shaped heat exchange tube 1 within the U-shaped shell 2 matches the inner contour of the U-shaped shell 2. The two ends of the U-shaped heat exchange tube 1 are respectively connected to corresponding tube holes on the tubesheet manifold assembly 19. The two open ends of the U-shaped shell 2 are welded to two corresponding tubesheet manifold assemblies 19. A separator is provided between the two tubesheet manifold assemblies 19. The space; the U-shaped shell 2 is provided with a medium inlet 3 and a medium outlet 4 that connect the inner cavity of the U-shaped shell 2. The medium inlet 3, the space between the inner wall of the U-shaped shell 2 and the outer wall of the U-shaped heat exchange tube 1, and the medium outlet 4 form a first medium flow channel; the two tube sheet manifold assemblies 19 are provided with a second medium inlet 16 on one side and a second medium outlet 17 on the other side. The second medium flow channel is formed by the second medium inlet 16, the tube sheet manifold assembly 19 corresponding to the second medium inlet 16, the inner cavity of the U-shaped heat exchange tube 1, the other manifold 5, and the second medium outlet 17.
[0043] In this embodiment, unlike the straight cylindrical shell in the prior art, which creates a large temperature difference on both sides of the tube sheet 6, this application uses two independent headers 5, which separates the cold end and the hot end. This avoids the disadvantage of the cold and hot fluids forming a large temperature difference on both sides of the same tube sheet 6 in ordinary U-tube heat exchangers, and also avoids the problem of difficult coordination between the expansion of the shell and the U-shaped heat exchange tube 1 in ordinary shell and tube heat exchangers.
[0044] In this embodiment, the U-shaped housing 2 is U-shaped and has two open ends facing the same side.
[0045] This invention avoids the drawback of a large temperature difference between the hot and cold fluids on both sides of the same tube sheet 6 in ordinary U-tube heat exchangers by using the cooperation of the U-shaped shell 2 and the two tube sheet manifold assemblies 19. Specifically, the two open ends of the U-shaped shell 2 are directly guided to be sealed and connected to the two tube sheet manifold assemblies 19 one by one. In this way, the first medium will flow in the first medium flow channel and the second medium will flow in the second medium flow channel. Due to the existence of the separation space, the heat between the two tube sheet manifold assemblies 19 can be separated.
[0046] Preferably, the tube sheet and manifold assembly 19 consists of a tube sheet 6 and a manifold 5. The manifold 5 includes a flange 7, a head 8, and a connecting pipe 18. One side of the tube sheet 6 is sealed to the open end of the U-shaped shell 2, and the other side is fastened to the flange 7 of the manifold 5 by means of a sealing ring and bolts. The side of the flange 7 away from the tube sheet 6 is sealed and welded to the head 8, and the end face of the tube sheet 6 and the inner wall of the head 8 together define a converging chamber 9 for the convergence or distribution of the second medium. The connecting pipe 18 communicates with the head 8, and the port of the connecting pipe 18 serves as the inlet 16 or outlet 17 of the second medium. The end of the U-shaped heat exchange tube 1 passes through the tube sheet 6 and is sealed to it, and communicates with the converging chamber 9.
[0047] With the above design, the tube sheet 6 and the manifold 5 can respectively achieve the purpose of sealing the opening end of the U-shaped shell 2 and guiding the medium to flow in the second medium flow channel.
[0048] Specifically, one side of the tube sheet 6 is sealed to the open end of the U-shaped shell 2, and the other side is sealed to the flange 7 of the header 5 (the connection method is bolt connection). Then, the end of the U-shaped heat exchange tube 1 is guided through the tube sheet 6 and sealed to it, and then extended into the converging chamber 9. At this time, it passes through the medium inlet 3, the inner wall of the U-shaped shell 2 and the space outside the U-shaped heat exchange tube 1 to the medium outlet 4, forming a first medium flow channel. That is to say, the first medium will flow in the first medium flow channel, and at the same time, the second medium is guided to enter one of the converging chambers 9 through the second medium inlet 16. Therefore, the second medium will flow in the second medium flow channel, and then flow into another converging chamber 9 and be discharged from the second medium outlet 17.
[0049] Preferably, the tube sheet 6 includes a tube sheet body 10, a heat insulation gasket 11, and a pressure plate 12 arranged sequentially along the axial direction from the outside to the inside of the U-shaped shell 2 at the open end; the tube sheet body 10 has an inner surface and an outer surface arranged opposite to each other; the heat insulation gasket 11 and the pressure plate 12 are both located inside the U-shaped shell 2, and the heat insulation gasket 11 is arranged close to the inner surface of the tube sheet body 10; the heat insulation gasket 11 is configured to reduce the heat transfer of the first medium to the outside of the tube sheet body 10.
[0050] In this embodiment, the U-shaped heat exchange tube 1 passes through the pressure plate 12 and the heat insulation gasket 11 and is connected to the tube sheet 6 in a way that is both airtight and strong (the airtightness can be achieved by means of expansion, welding or sealing gaskets).
[0051] With the above design, the temperature difference between the hot and cold sides and the inner and outer surfaces of the tube sheet 6 can be reduced simultaneously, thereby reducing the temperature stress in the hot and cold areas and between the inner and outer surfaces of the tube sheet 6. It also prevents excessive temperature from forming around the opening of the U-shaped shell 2. Specifically, because the heat insulation gasket 11 is located inside the opening of the U-shaped shell 2 and is arranged close to the inner surface of the tube sheet body 10, the temperature of the first medium flowing in the first medium flow channel will not be significantly transferred to the outside. Furthermore, because the heat insulation gasket 11 and the interior of the U-shaped shell 2 are in an interference fit, the heat transferred by the second medium to the tube sheet body 10 will not be transferred to the periphery of the opening of the U-shaped shell 2.
[0052] The heat insulation pad 11 is made of heat insulation materials such as polymer-based composite materials (low temperature medium) and ceramic fibers (high temperature medium). Its heat insulation effect greatly reduces the temperature difference between the two sides of the tube sheet body 10, that is, it reduces the thermal stress of the two sides of the tube sheet body 10. At the same time, it also reduces the risk of structural failure of the tube sheet 6 due to stress corrosion and stress cracking, thereby extending the service life of the equipment.
[0053] Preferably, the shape of the pressure plate 12 is matched with the shape of the heat insulation pad 11.
[0054] Preferably, multiple U-shaped heat exchange tubes 1 are provided, and these multiple U-shaped heat exchange tubes 1 are combined to form a tube bundle structure 13 by baffles 15 provided in the U-shaped shell 2.
[0055] The above design enables higher heat exchange efficiency between the first and second media.
[0056] Preferably, the heat insulation pad 11 is provided with a through hole 14 for guiding the U-shaped heat exchange tube 1 into the converging chamber 9.
[0057] With the above design, the U-shaped heat exchange tube 1 can extend to the converging chamber 9 through the through hole 14. Furthermore, a sealing element or other structure can be provided at the end of the through hole 14 to achieve a seal.
[0058] It should be noted that the through hole 14 is the corresponding pipe hole on the aforementioned tube sheet manifold assembly 19. The through hole 14 is provided on the entire tube sheet 6.
[0059] Preferably, a plurality of baffles 15 are provided in the space between the inner wall of the U-shaped shell 2 and the outer wall of the U-shaped heat exchange tube 1, and all the baffles 15 are spaced apart along a direction perpendicular to the axis of the U-shaped heat exchange tube 1.
[0060] With the above design, when the first medium flows inside the U-shaped shell 2, it can flow fully under the guidance of the baffle 15, thereby improving the heat exchange efficiency between it and the second medium.
[0061] The specific arrangement of the baffles 15 is as follows: the baffles 15 adopt a circular structure with planar notches. In the arrangement, the notches of adjacent baffles 15 are alternately arranged facing the inner and outer sides of the U-shape of the U-shaped heat exchange tube 1, thereby guiding the first medium to flow fully.
[0062] Working principle:
[0063] One side of the tube sheet 6 is sealed to the open end of the U-shaped shell 2, and the other side is sealed to the flange 7. Then, the end of the U-shaped heat exchange tube 1 is guided through the tube sheet 6 and sealed to it, and then extends into the converging chamber 9. At this time, it passes through the medium inlet 3, the inner wall of the U-shaped shell 2 and the space outside the U-shaped heat exchange tube 1 to the medium outlet 4, forming a first medium flow channel. That is to say, the first medium will flow in the first medium flow channel, and at the same time, the second medium is guided into one of the converging chambers 9. Therefore, the second medium will flow in the second medium flow channel and then be discharged from the other converging chamber 9. In this process, since the heat insulation gasket 11 is located inside the open end of the U-shaped shell 2 and is arranged close to the inner surface of the tube sheet body 10, the temperature of the first medium flowing in the first medium flow channel will not be transferred to the outside in large quantities. At the same time, the heat insulation gasket 11 and the interior of the U-shaped shell 2 are in an interference fit, so the heat transferred by the second medium to the tube sheet body 10 will not be transferred to the periphery of the open end of the U-shaped shell 2.
[0064] The above embodiments are only for illustrating the technical concept and features of this utility model, and are intended to enable those skilled in the art to understand the content of this utility model and implement it accordingly. They should not be construed as limiting the scope of protection of this utility model. All equivalent changes or modifications made in accordance with the spirit and essence of this utility model should be included within the scope of protection of this utility model.
Claims
1. A U-tube heat exchanger with a U-shaped shell, characterized in that: It includes U-shaped heat exchange tubes (1), U-shaped shell (2) and two tube sheet manifold assembly (19); The U-shaped shell (2) is U-shaped, and the U-shaped heat exchange tube (1) is arranged inside the U-shaped shell (2). The spatial orientation of the U-shaped heat exchange tube (1) inside the U-shaped shell (2) matches the inner cavity contour of the U-shaped shell (2). The two ends of the U-shaped heat exchange tube (1) are respectively connected to the corresponding tube holes on the tube sheet manifold assembly (19). The two open ends of the U-shaped shell (2) are welded to two corresponding tube sheet manifold assemblies (19). A partition space is provided between the two tube sheet manifold assemblies (19); The U-shaped shell (2) is provided with a medium inlet (3) and a medium outlet (4) that connect the inner cavity of the U-shaped shell (2). The medium flows through the medium inlet (3), the space between the inner wall of the U-shaped shell (2) and the outer wall of the U-shaped heat exchange tube (1) to the medium outlet (4), forming a first medium flow channel. On the two tube sheet manifold assemblies (19), one is provided with a second medium inlet (16) and the other is provided with a second medium outlet (17). The second medium flow channel is formed by the second medium inlet (16), the tube sheet manifold assembly (19) corresponding to the second medium inlet (16), the inner cavity of the U-shaped heat exchange tube (1), the other manifold (5) to the second medium outlet (17).
2. The U-tube heat exchanger with a U-shaped shell according to claim 1, characterized in that: The tube sheet and header assembly (19) consists of a tube sheet (6) and a header (5), wherein the header (5) includes a flange (7), a head (8) and a nozzle (18). One side of the tube sheet (6) is sealed to the open end of the U-shaped shell (2), and the other side is fastened to the flange (7) of the header (5) by means of a sealing ring and bolts. The flange (7) is sealed and welded to the end cap (8) on the side away from the tube sheet (6), and the end face of the tube sheet (6) and the inner wall of the end cap (8) together define a converging chamber (9) for the convergence or distribution of the second medium. The connector (18) is connected to the end cap (8), and the port of the connector (18) serves as the second medium inlet (16) or the second medium outlet (17). The end of the U-shaped heat exchange tube (1) passes through the tube sheet (6) and is sealed to it, and communicates with the converging chamber (9).
3. The U-tube heat exchanger with a U-shaped shell according to claim 2, characterized in that: The tube sheet (6) includes a tube sheet body (10), a heat insulation pad (11), and a pressure plate (12) arranged sequentially along the axial direction from the outside to the inside of the U-shaped shell (2) at the open end. The tube sheet body (10) has an inner surface and an outer surface that are opposite to each other; The heat insulation pad (11) and the pressure plate (12) are both located inside the U-shaped shell (2), and the heat insulation pad (11) is arranged close to the inner surface of the tube sheet body (10); the heat insulation pad (11) is configured to reduce the heat transfer of the first medium to the outside of the tube sheet body (10).
4. The U-tube heat exchanger with a U-shaped shell according to claim 3, characterized in that: The shape of the pressure plate (12) is matched with the shape of the heat insulation pad (11).
5. The U-tube heat exchanger with a U-shaped shell according to claim 1, characterized in that: The U-shaped heat exchange tubes (1) are provided in multiple ways. These multiple U-shaped heat exchange tubes (1) are combined to form a tube bundle structure (13) by means of baffles (15) provided in the U-shaped shell (2).
6. The U-tube heat exchanger with a U-shaped shell according to claim 1 or 5, characterized in that: Multiple baffles (15) are provided in the space between the inner wall of the U-shaped shell (2) and the outer wall of the U-shaped heat exchange tube (1), and all the baffles (15) are spaced apart along the direction perpendicular to the axis of the U-shaped heat exchange tube (1).