Novel sealing lower tube plate of heat exchanger

Abstract

The utility model relates to the technical field of heat exchangers, in particular to a novel sealing lower tube plate of a heat exchanger, which comprises a lower tube plate body, a heat exchange tube, a limiting unit and a sealing unit, a plurality of heat exchange holes are formed in the lower tube plate body; a heat exchange pipe is arranged on the heat exchange holes, one end of the heat exchange pipe is in expanded connection and / or welded with the heat exchange holes, and the heat exchange pipe is used for circulating heat exchange fluid; the limiting unit comprises limiting parts and fastening parts, the fastening parts are arranged on the heat exchange tubes, the limiting parts are arranged on the two sides of the fastening parts, the fastening parts abut against the limiting parts, and the limiting parts are used for limiting the sealing unit; the sealing unit is arranged on one side of the limiting part and used for sealing gaps between the heat exchange holes and the heat exchange tubes, and the sealing degree of the connecting positions of the heat exchange tubes and the lower tube plate is improved through the arrangement of the sealing unit and the limiting unit.

Description

TECHNICAL FIELD

[0001] The utility model relates to heat exchanger technical field, specifically, a kind of novel sealing lower tube sheet of heat exchanger. BACKGROUND

[0002] The tubular heat exchanger is a kind of widely used in industrial field high-efficiency heat exchange equipment, its main function is to carry out heat transfer between two different temperature fluids, while keeping two fluids not directly contact. After long time use, the tube sheet and the heat exchange tube connection place can bear very big thermal stress, but, the heat exchange tube of existing tubular heat exchanger adopts expansion and welding connection mode, and the temperature can change frequently in the operation process of heat exchanger, and the thermal expansion and shrinkage of tube sheet and heat exchange tube can be caused by temperature change. Due to the different thermal expansion coefficients of tube sheet and heat exchange tube, thermal stress can be generated. Thermal stress concentrates at welding or expansion joint, and long-term effect can cause material fatigue, thereby forming crack, causing heat exchange fluid leakage, and further affecting heat exchange efficiency.

[0003] Therefore, a novel sealing lower tube sheet of heat exchanger is needed to solve the problems in the prior art. UTILITY MODEL CONTENT

[0004] In view of this, the utility model provides a novel sealing lower tube sheet of heat exchanger, to solve the problem of existing heat exchange tube leakage.

[0005] The utility model provides a novel sealing lower tube sheet of heat exchanger, comprising:

[0006] Lower tube sheet body, heat exchange tube, limiting unit and sealing unit are set up on the lower tube sheet body;

[0007] A plurality of heat exchange holes are arranged on the lower tube sheet body;

[0008] The heat exchange tube is arranged in the heat exchange hole, one end of the heat exchange tube is expanded and / or welded with the inner side wall of the heat exchange hole, and the heat exchange tube is used for circulating heat exchange fluid;

[0009] The limiting unit comprises limiting part and fastening part, the fastening part is arranged on the heat exchange tube, the limiting part is arranged on both sides of the fastening part, the fastening part abuts against the limiting part, and the limiting part is used for limiting the sealing unit;

[0010] The sealing unit is arranged on one side of the limiting part, and the sealing unit is used for sealing the gap between the heat exchange hole and the heat exchange tube.

[0011] Further, the limiting part comprises limiting arm, limiting rod and limiting block, the limiting rod is fixedly connected to the heat exchange tube at equal intervals, the limiting block is fixedly connected with the limiting rod, a limiting arm is fixedly penetrated on the limiting block, and the limiting arm abuts against the fastening part at both ends.

[0012] Further, the fastening part comprises a first limiting ring and a second limiting ring, the first limiting ring and the second limiting ring are respectively arranged on both sides of the limiting arm, and the first limiting ring and the second limiting ring are used for limiting the limiting arm.

[0013] Further, the sealing unit comprises a sealing sleeve and a sealing ring, one end of the sealing sleeve is fixedly connected with the sealing ring, and the other side of the sealing sleeve abuts against the first limiting ring.

[0014] Further, the sealing sleeve is matched with the heat exchange pipe, and three sealing rings are fixedly connected to the outer side of one end of the sealing sleeve.

[0015] Further, it further comprises a flow guide part, the flow guide part comprises a first flow guide hole, the first flow guide hole is arranged on one side of the heat exchange pipe, the hole wall of the first flow guide hole is an inclined surface, and the inclination angle of the hole wall of the first flow guide hole is 45°.

[0016] Further, the flow guide part further comprises a second flow guide hole, the second flow guide hole is arranged in the middle of the heat exchange pipe, the hole wall of the second flow guide hole is an inclined surface, the inclination angle of the hole wall of the second flow guide hole is 45°, and the diameter of the hole wall of the second flow guide hole is greater than that of the first flow guide hole.

[0017] Further, the flow guide part further comprises a third flow guide hole, the third flow guide hole is arranged in axial symmetry with the first flow guide hole and the second flow guide hole, the hole wall of the third flow guide hole is an inclined surface, the inclination angle of the hole wall of the third flow guide hole is 45°, and the diameter of the hole wall of the third flow guide hole is greater than that of the second flow guide hole.

[0018] Further, the flow guide part further comprises a fourth flow guide hole, the fourth flow guide hole is arranged at one end of the heat exchange pipe, the hole wall of the fourth flow guide hole is an inclined surface on one side, and the inclination angle of the hole wall of the fourth flow guide hole is 45°.

[0019] Compared with the prior art, the heat exchanger novel sealing lower tube plate has the advantages that: the heat exchanger novel sealing lower tube plate is provided with the limiting unit and the sealing unit, the limiting unit is composed of the limiting part and the fastening part, the limiting part is arranged in the middle of the fastening part and is used for limiting the fastening part, one side of the limiting unit abuts against the sealing unit, the other side of the limiting unit abuts against the limiting part, and the sealing unit is used for plugging the gap between the heat exchange hole and the heat exchange pipe; in the working process of the heat exchanger, thermal stress is generated, the heat exchange pipe and the heat exchange hole are all subjected to thermal expansion to different degrees; the limiting unit can limit the relative displacement between the heat exchange hole and the heat exchange pipe through the limiting part and the fastening part, so that the heat exchange pipe is prevented from being displaced when the heat exchange pipe is subjected to thermal expansion, the impact and extrusion on the sealing unit are reduced, and the sealing unit is prevented from being disabled due to excessive deformation. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 The whole schematic view of the heat exchanger novel sealing lower tube plate is provided for the embodiment of the utility model;

[0021] Figure 2 The schematic view of the heat exchanger novel sealing lower tube plate is provided for the embodiment of the utility model;

[0022] Figure 3 The schematic view of the sealing unit in the heat exchanger novel sealing lower tube plate is provided for the embodiment of the utility model;

[0023] Figure 4 The sectional view of the heat exchanger novel sealing lower tube plate is provided for the embodiment of the utility model;

[0024] Figure 5 The schematic view of the limiting part in the heat exchanger novel sealing lower tube plate is provided for the embodiment of the utility model;

[0025] Figure 6 The schematic view of the heat exchange pipe in the heat exchanger novel sealing lower tube plate is provided for the embodiment of the utility model.

[0026] 1, lower tube plate body; 101, heat exchange hole; 2, heat exchange pipe; 3, limiting unit; 301, fastening part; 3011, first limiting ring; 3012, second limiting ring; 302, limiting part; 3021, limiting arm; 3022, limiting rod; 3023, limiting block; 4, sealing unit; 401, sealing sleeve; 402, sealing ring; 5, flow guide part; 501, first flow guide hole; 502, second flow guide hole; 503, third flow guide hole; 504, fourth flow guide hole. DETAILED DESCRIPTION

[0027] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the purpose of facilitating the description of the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0028] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the purpose of facilitating the description of the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0029] The terms "first", "second" are only for descriptive purpose, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0030] In the description of the present application, it should be noted that unless otherwise specified and limited, the terms "mounting", "connecting", "connection" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through intermediate medium, or internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0031] Shell and tube heat exchanger is one of the most common heat exchanger, tube heat exchanger through the tube wall heat transfer. Tube heat exchanger is most widely used, it has the advantages of simple structure, strong and durable, low cost, wide use of materials, easy to clean, strong adaptability, is the most widely used, in the heat exchange equipment occupies a dominant position. It is composed of shell, tube bundle, head, tube plate, baffle, pipe and other components. Its structural characteristics are that two tube plates are welded on both ends of the shell, and the tube bundle is fixed on the tube plate. The whole heat exchanger is divided into two parts: the channel in the heat exchange tube and the through hole at both ends of the heat exchange tube are called tube (tube) fluid, and the channel outside the heat exchange tube and the through hole are called shell (shell) fluid. However, the existing heat exchanger is expanded and then welded in the operation process, but the heat exchanger will produce thermal stress in the working process, and then the connection between the heat exchange tube and the heat exchange hole will concentrate stress, which will cause the connection to have gaps or cracks, and then the shell fluid and the tube fluid will mix, resulting in the reduction of the heat exchange power of the heat exchanger.

[0032] Therefore, a technology is needed to solve the problem of liquid leakage at the connection between the heat exchange tube and the heat exchange hole.

[0033] Referring to Figure 1 The embodiment provides a novel sealed lower tube plate of a heat exchanger, which comprises a lower tube plate body 1, a heat exchange tube 2, a limiting unit 3 and a sealing unit 4.

[0034] The lower tube plate body 1 is provided with a plurality of heat exchange holes 101.

[0035] The heat exchange tube 2 is arranged in the heat exchange hole 101, one end of the heat exchange tube 2 is expanded and / or welded with the inner side wall of the heat exchange hole 101, and the heat exchange tube 2 is used for circulating heat exchange fluid.

[0036] The limiting unit 3 comprises a limiting portion 302 and a fastening portion 301, the fastening portion 301 is arranged on the heat exchange tube 2, the limiting portion 302 is arranged on both sides of the fastening portion 301, the fastening portion 301 abuts against the limiting portion 302, and the limiting portion 302 is used for limiting the sealing unit 4.

[0037] The sealing unit 4 is arranged on one side of the limiting portion 302, and the sealing unit 4 is used for sealing the gap between the heat exchange hole 101 and the heat exchange tube 2.

[0038] Specifically, the heat exchanger often faces high temperature and high pressure working environment in industrial applications, which can cause thermal stress on its components. Thermal stress refers to the internal stress of the material caused by temperature change. Long-term existence of thermal stress can cause material fatigue, deformation and even rupture, thereby affecting the performance and safety of the heat exchanger. Therefore, the limiting unit 3 is arranged on one end of the heat exchange pipe 2 close to the heat exchange hole 101. The limiting unit 3 includes a limiting part 302 and a fastening part 301. The fastening part 301 is arranged on both sides of the limiting part 302. One end of one fastening part 301 abuts against the sealing unit 4, and the other end abuts against the limiting part 302. The other end of the limiting part 302 abuts against the other fastening part 301. Thus, the fastening part 301 fastens the limiting part 302, and the limiting part 302 limits the fastening part 301. In this way, the sealing unit 4 is tightly abutted in the gap between the heat exchange hole 101 and the heat exchange pipe 2, preventing the mixing of heat exchange fluids due to the fracture or gap of the welding part, and thus reducing the heat exchange efficiency.

[0039] It can be understood that the lower tube sheet body 1 is one of the core components of the heat exchanger, and a plurality of heat exchange holes 101 are arranged thereon. These heat exchange holes 101 are used to install heat exchange pipes 2. The heat exchange pipes 2 circulate heat exchange fluids inside, and realize energy transfer through heat exchange with another fluid. The connection mode of the heat exchange hole 101 and the heat exchange pipe 2 usually includes expansion and welding. Both of these two modes can ensure the tight connection between the heat exchange pipe 2 and the lower tube sheet body 1. However, even if these connection modes are adopted, the heat exchange hole 101 and the heat exchange pipe 2 are still prone to thermal stress at the connection part, which can cause fatigue and deformation of the connection part, thereby increasing the risk of leakage. In order to further enhance the sealing performance of the heat exchange hole 101 and the heat exchange pipe 2 at the connection part and prevent the influence of thermal stress, the limiting unit 3 and the sealing unit 4 are used in the embodiment. The limiting unit 3 includes a limiting part 302 and a fastening part 301. The fastening part 301 is arranged on the heat exchange pipe 2, and the limiting part 302 is arranged on both sides of the fastening part 301. The fastening part 301 abuts against the limiting part 302. One end of one fastening part 301 abuts against the sealing unit 4, and the other end abuts against the limiting part 302. The other end of the limiting part 302 abuts against the other fastening part 301. Not only does this ensure the fastening effect of the fastening part 301, but also limits the position of the fastening part 301 through the limiting part 302, so that it can remain stable under the action of thermal stress. The sealing unit 4 abuts against the fastening part 301, and is used to block the gap between the heat exchange hole 101 and the heat exchange pipe 2.

[0040] The limiting part 302 is arranged on both sides of the fastening part 301, which mainly functions to limit the displacement of the fastening part 301. In a high-temperature environment, the material between the heat exchange pipe 2 and the heat exchange hole 101 will expand due to heat, which may cause the fastening part 301 to loosen, thereby affecting the sealing performance of the connection part. The limiting part 302 is arranged in the middle of the two fastening parts 301, which can maintain the position of the fastening part 301 during thermal expansion, preventing displacement, not only maintaining the stability of the connection part, but also reducing the risk of displacement of the sealing unit 4 due to excessive stress, thereby causing failure.

[0041] In some embodiments of the present application, referring to Figure 5 As shown, the limiting part 302 includes a limiting arm 3021, a limiting rod 3022, and a limiting block 3023. The limiting rod 3022 is fixedly connected to the heat exchange pipe 2 at equal intervals. The limiting block 3023 is fixedly connected to the limiting rod 3022. The limiting block 3023 is fixedly penetrated by the limiting arm 3021. The limiting arm 3021 abuts against the fastening part 301 at both ends.

[0042] Specifically, the limiting rod 3022 is fixedly connected to the heat exchange pipe 2. The heat exchange block is fixedly connected to the heat exchange pipe 2. The heat exchange block is fixedly connected to the limiting arm 3021, thereby stably maintaining the limiting arm 3021 in the middle of the two fastening parts 301. The limiting part 302 is provided with multiple limiting parts, which are arranged around the heat exchange pipe 2, thereby limiting the fastening part 301.

[0043] It can be understood that, in order to further enhance the sealing performance of the connection between the heat exchange hole 101 and the heat exchange pipe 2 and prevent the influence of thermal stress, the limiting unit 3 includes the limiting part 302 and the fastening part 301. The fastening part 301 is arranged on the heat exchange pipe 2. The limiting part 302 is arranged on both sides of the fastening part 301. The fastening part 301 abuts against the limiting part 302. The limiting part 302 includes the limiting arm 3021, the limiting rod 3022, and the limiting block 3023. The limiting rod 3022 is fixedly connected to the heat exchange pipe 2 at equal intervals. The limiting block 3023 is fixedly connected to the limiting rod 3022. The limiting block 3023 is fixedly penetrated by the limiting arm 3021. The limiting arm 3021 abuts against the fastening part 301 at both ends. The limiting part 302 is provided with multiple limiting parts, which are arranged around the heat exchange pipe 2, thereby achieving comprehensive limiting of the fastening part 301.

[0044] The limiting rod 3022 is fixedly connected to the heat exchange pipe 2 at equal intervals. The main function of the limiting rod 3022 is to provide an installation base point for the limiting part 302, so as to ensure that it can maintain stable connection in a high-temperature and high-pressure environment. The limiting rod 3022 is made of metal material with good high-temperature resistance and pressure resistance, such as stainless steel or alloy steel, so as to ensure its reliability in extreme working conditions.

[0045] The limiting block 3023 is fixedly connected with the limiting rod 3022, providing a mounting fixed point of the limiting arm 3021. The limiting block 3023 is fixedly penetrated by the limiting arm 3021, and the two ends of the limiting arm 3021 abut against the fastening part 301, thereby realizing the limiting of the fastening part 301. The two ends of the limiting arm 3021 abut against the fastening part 301, and the limiting function thereof ensures that the fastening part 301 remains stable under the action of thermal stress, and meanwhile the fastening part 301 below the limiting arm 3021 can fasten the limiting arm 3021, preventing displacement of the limiting arm 3021 due to thermal stress, not only maintaining the sealing performance of the connecting part, but also reducing material fatigue and deformation caused by thermal stress. The equidistant distribution of the limiting rods 3022 ensures the uniform distribution of the limiting part 302 on the entire heat exchange pipe 2, thereby improving the overall stability. The limiting block 3023 is fixedly connected with the limiting rod 3022, providing a mounting fixed point of the limiting arm 3021. The limiting block 3023 ensures the mounting stability thereof in a high-temperature and high-pressure environment, thereby enhancing the limiting effect of the limiting arm 3021. The fixed connection of the limiting block 3023 enables the limiting arm 3021 to maintain its position under the action of thermal stress, preventing loosening of the fastening part 301.

[0046] In some embodiments of the present application, referring to Figure 2 As shown, the fastening part 301 includes a first limiting ring 3011 and a second limiting ring 3012, and the first limiting ring 3011 and the second limiting ring 3012 are respectively arranged on the two sides of the limiting arm 3021, and are used for limiting the limiting arm 3021.

[0047] Specifically, the fastening part 301 includes a first limiting ring 3011 and a second limiting ring 3012, one side of the first limiting ring 3011 abuts against the sealing unit 4, and the other side abuts against the limiting arm 3021, and the second limiting ring 3012 is arranged below the limiting arm 3021 and is used for preventing displacement of the limiting arm 3021. The first limiting ring 3011 is subjected to a fastening force by the limiting arm 3021, so as to continuously abut against the sealing unit 4, preventing displacement of the sealing unit 4 and thereby preventing the gap between the heat exchange hole 101 and the heat exchange pipe 2 from leaking liquid, and the second limiting ring 3012 is used for fastening the limiting arm 3021, so that the limiting arm 3021 can continuously apply a fastening force to the first limiting ring 3011.

[0048] It can be understood that the first limiting ring 3011 is arranged on one side of the limiting arm 3021, one side of which is in close contact with the sealing unit 4, and the other side abuts against the limiting arm 3021. The main function of the first limiting ring 3011 is to ensure that the sealing unit 4 always maintains close contact under the action of thermal stress by the fastening force applied by the limiting arm 3021, preventing the sealing unit 4 from failing due to displacement. The second limiting ring 3012 is arranged below the limiting arm 3021, for preventing displacement of the limiting arm 3021. The main function of the second limiting ring 3012 is to fasten the limiting arm 3021, so that it maintains a stable position under the action of thermal stress, thereby ensuring that the first limiting ring 3011 can continuously exert a fastening force. During the working process of the heat exchanger, the materials of the heat exchange pipe 2 and the heat exchange hole 101 will expand due to temperature changes, causing thermal stress at the connection site. The two ends of the limiting arm 3021 abut against the first limiting ring 3011 and the second limiting ring 3012, and through its limiting function, it ensures that the fastening part 301 maintains a stable position under the action of thermal stress. One side of the first limiting ring 3011 is in close contact with the sealing unit 4, and the other side abuts against the limiting arm 3021, ensuring that the sealing unit 4 does not displace when it expands. The second limiting ring 3012 is arranged below the limiting arm 3021, for preventing displacement of the limiting arm 3021 due to thermal stress. Through the multi-layer limiting mechanism, the displacement of the heat exchange pipe 2 when it expands is controlled, reducing the loosening of the connection caused by thermal stress.

[0049] The limiting arm 3021 and the limiting ring make the thermal stress evenly distributed at the connection site. Without the limiting ring, the thermal stress may be concentrated at the welding site or the connection, causing excessive local stress and increasing the risk of liquid leakage. The limiting ring, through its multi-point limiting function, makes the stress evenly dispersed at multiple points, reducing the phenomenon of local stress concentration. The evenly distributed stress not only improves the stability of the connection site, but also prolongs the service life of the material. The close combination of the limiting arm 3021 and the limiting ring makes the entire connection site a whole, which can better withstand the action of thermal stress and prevent material fatigue and deformation caused by excessive local stress.

[0050] The sealing unit 4 is arranged on one side of the limiting part 302 and is used to block the gap between the heat exchange hole 101 and the heat exchange pipe 2. In a high-temperature and high-pressure environment, the sealing unit 4 may lose the sealing effect due to material softening or thermal expansion. The design of the limiting ring ensures that the sealing unit 4 always maintains appropriate compression force during installation and use through its multi-layer limiting mechanism. The first limiting ring 3011 continuously adheres to the sealing unit 4 by the fastening force applied by the limiting arm 3021, preventing the sealing unit 4 from failing due to displacement. The second limiting ring 3012 fastens the limiting arm 3021, ensuring that the first limiting ring 3011 can continuously apply the fastening force, not only improving the sealing performance of the sealing unit 4, but also preventing the mixing of heat exchange fluids due to cracks in the welding, thereby reducing the heat exchange efficiency and safety hazards.

[0051] In some embodiments of the present application, referring to FIGS. 1 and 2, the sealing unit 4 includes a sealing sleeve 401 and a sealing ring 402. One side of the sealing sleeve 401 is fixedly connected to the sealing ring 402, and the other side of the sealing sleeve 401 abuts against the first limiting ring 3011. Figure 3 、 Figure 4 In some embodiments of the present application, referring to FIGS. 1 and 2, the sealing unit 4 includes a sealing sleeve 401 and a sealing ring 402. One side of the sealing sleeve 401 is fixedly connected to the sealing ring 402, and the other side of the sealing sleeve 401 abuts against the first limiting ring 3011.

[0052] In some embodiments of the present application, the sealing sleeve 401 is adapted to the heat exchange pipe 2, and the outer side of the sealing sleeve 401 is fixedly connected to three sealing rings 402.

[0053] Specifically, the sealing sleeve 401 is larger in diameter than the heat exchange hole 101 and adheres to one side of the heat exchange hole 101. A through hole is formed in the middle of the sealing sleeve 401, and the size of the through hole corresponds to the heat exchange pipe 2. The outer side of the sealing sleeve 401 is fixedly connected to three sealing rings 402, which are arranged and connected from large to small. The overall sealing unit 4 is in a stepped shape, and the heat exchange hole 101 is provided with a groove corresponding in size to the sealing ring 402, so that the sealing ring 402 can tightly adhere to the groove, thereby increasing the sealing effect of the sealing unit 4.

[0054] It can be understood that the sealing sleeve 401 is larger than the diameter of the heat exchange hole 101, and is fitted to one side of the heat exchange hole 101. The middle of the sealing sleeve 401 is provided with a through hole, and the size of the through hole corresponds to the heat exchange pipe 2, so as to ensure that the heat exchange pipe 2 can pass through smoothly. The sealing unit 4 is composed of an elastic aerogel layer, a heat-resistant silicone layer and a polyimide layer. The elastic aerogel layer ensures the stability and durability of the sealing. The high elasticity and good compression and rebound performance of the elastic aerogel layer enable the sealing ring to maintain the original sealing effect after long-term use. The heat-resistant silicone layer makes the sealing ring resistant to high temperature and less prone to aging and deformation, thereby adapting to the working requirements of the heat exchanger in a high-temperature environment. The polyimide layer increases the strength and chemical corrosion resistance of the sealing ring, so that the sealing ring can maintain good performance in a complex chemical environment. One side of the sealing sleeve 401 is fixedly connected with the sealing ring 402, and the other side is abutted with the first limiting ring 3011. Through the action of the limiting ring, the sealing sleeve 401 can maintain a stable position under thermal stress.

[0055] The outer side of the sealing sleeve 401 is fixedly connected with three sealing rings 402, and the sealing rings 402 are arranged and connected from large to small, forming a stepped structure, so that the sealing rings 402 can be sealed in multiple layers, thereby increasing the overall sealing effect of the sealing unit 4. The heat exchange hole 101 is provided with a groove corresponding in size to the sealing ring 402, so that the sealing ring 402 can be closely fitted to the groove, forming a stable sealing surface, thereby preventing fluid mixing. The sealing unit 4 is composed of multiple sealing rings 402, forming a multi-layer sealing mechanism, thereby improving the overall sealing performance of the sealing unit 4. Even if one layer of sealing fails, other layers of sealing can still effectively prevent fluid mixing, thereby improving the safety and reliability of the equipment. The sealing rings 402 are arranged and connected from large to small, forming a stepped structure, so that the sealing rings 402 can always be closely fitted to the groove in the heat exchange hole 101 under different thermal stress, thereby increasing the sealing effect of the sealing unit 4. The stepped structure design can also provide more sealing contact surfaces, further improving the sealing performance. In a high-temperature and high-pressure environment, this multi-contact sealing structure can prevent sealing failure caused by material softening or thermal expansion. The heat exchange pipe 2 and the heat exchange hole 101 will expand under high temperature, causing thermal stress at the connection part. The multi-layer design of the sealing ring 402 causes the displacement caused by thermal expansion to be evenly distributed among the multiple sealing rings 402, reducing the phenomenon of excessive local displacement. The close fitting to the groove ensures that the sealing ring 402 can still be closely fitted even in the case of thermal expansion, preventing sealing failure caused by displacement. The sealing unit 4 can evenly distribute stress at multiple points through its multi-point limiting function, reducing the phenomenon of local stress concentration. The evenly distributed stress not only improves the stability of the connection part, but also prolongs the service life of the material.

[0056] In some embodiments of the present application, reference is made to Figure 6The guide flow part 5 also includes a first guide flow hole 501, which is arranged on one side of the heat exchange pipe 2. The hole wall of the first guide flow hole 501 is an inclined surface, and the inclination angle of the inclined surface of the hole wall of the first guide flow hole 501 is 45°.

[0057] In some embodiments of the present application, the guide flow part 5 also includes a second guide flow hole 502, which is arranged in the middle of the heat exchange pipe 2. The hole wall of the second guide flow hole 502 is an inclined surface, and the inclination angle of the inclined surface of the hole wall of the second guide flow hole 502 is 45°. The diameter of the hole wall of the second guide flow hole 502 is greater than that of the first guide flow hole 501.

[0058] In some embodiments of the present application, the guide flow part 5 also includes a third guide flow hole 503, which is arranged in axial symmetry with the first guide flow hole 501 and the second guide flow hole 502. The hole wall of the third guide flow hole 503 is an inclined surface, and the inclination angle of the inclined surface of the hole wall of the third guide flow hole 503 is 45°. The diameter of the hole wall of the third guide flow hole 503 is greater than that of the second guide flow hole 502.

[0059] Specifically, the guide flow hole arranged on the heat exchange pipe 2 can enhance the turbulence of the fluid, expand the heat exchange area and improve the heat exchange efficiency.

[0060] It can be understood that the guide flow hole arranged on the heat exchange pipe 2 can enhance the turbulence of the fluid, increase the heat exchange area and improve the heat exchange efficiency, ensure that the flow direction of the fluid in the heat exchange pipe 2 is more uniform, and reduce the phenomenon of excessive local flow rate. The hole wall of the third guide flow hole 503 is an inclined surface with an inclination angle of 45°. This inclined design can guide the flow direction of the fluid, enhance the turbulence of the fluid, and make the fluid form a vortex flow in the heat exchange pipe 2, thereby increasing the contact area between the fluid and the wall of the heat exchange pipe 2. The diameter of the hole wall of the third guide flow hole 503 is greater than that of the second guide flow hole 502, which can further expand the flow path of the fluid and provide more heat exchange area, thereby improving the heat exchange efficiency.

[0061] The vortex flow not only increases the contact area between the fluid and the wall of the heat exchange tube 2, but also enhances the turbulence of the fluid, thereby improving the heat transfer efficiency. In a high temperature and high pressure environment, the turbulence of the fluid has a significant impact on the heat transfer efficiency, because the turbulence can reduce the thickness of the fluid boundary layer and increase the speed of heat transfer. The turbulence of the fluid refers to the degree of vortex or turbulence formed by the fluid during flow. Enhanced fluid turbulence can reduce the thickness of the fluid boundary layer, increase the contact area between the fluid and the wall of the heat exchange tube 2, and thus increase the speed and efficiency of heat transfer. The flow guide hole improves the heat flux. The inclined design of the third flow guide hole 503 and the hole wall diameter larger than that of the second flow guide hole 502 enable the fluid to form a more uniform and complex flow state in the heat exchange tube 2, increase the contact area between the fluid and the wall of the heat exchange tube 2, and thus improve the heat flux. In a high temperature and high pressure environment, the heat flux of the heat exchanger can be improved, thereby improving the operating efficiency and economic benefit of the entire system.

[0062] In some embodiments of the present application, the flow guide part 5 further comprises a fourth flow guide hole 504, which is arranged at one end of the heat exchange tube 2. The single-side hole wall of the fourth flow guide hole 504 is an inclined surface, and the inclined surface of the hole wall of the fourth flow guide hole 504 has an inclination angle of 45°.

[0063] It can be understood that the single-side hole wall of the fourth flow guide hole 504 is an inclined surface with an inclination angle of 45°, which not only guides the flow direction of the fluid, but also reduces the resistance of the fluid at the hole opening. The design of the 45° inclined surface enables the fluid to transition more smoothly when entering the heat exchange tube 2, reduces the turbulence and resistance of the fluid at the hole opening, and thus improves the flow speed of the fluid and the heat transfer efficiency. In addition, it can also prevent the formation of bubbles or stagnant areas when the fluid enters the heat exchange tube 2, increase the uniformity of the fluid flow, and prevent the occurrence of local overheating. Local overheating refers to the temperature of a certain part of the fluid in the heat exchange tube 2 being too high, which can cause fatigue damage and thermal stress concentration of the material, thereby affecting the reliability and safety of the equipment. Specifically, the fourth flow guide hole 504 enables the shell-side fluid to form a transverse vortex flow after passing through the heat exchange tube 2, which uniformly distributes the fluid between the tubes and prevents local overheating caused by excessive local flow rate. In a high temperature and high pressure environment, local overheating can be prevented, thereby improving the reliability and safety of the equipment, while reducing the pressure drop. The pressure drop refers to the pressure loss of the fluid passing through the heat exchanger, and excessive pressure drop can affect the stability and reliability of the equipment. In a high temperature and high pressure environment, the pressure drop can be reduced, thereby improving the stability and reliability of the equipment.

[0064] Compared with the prior art, the utility model have advantages that: through setting spacing unit and sealing unit, spacing unit includes spacing part and fastening part, spacing part sets up in the middle of fastening part, is used for spacing fastening part, and one side abuts sealing unit, other side abuts spacing part, and sealing unit is used for blocking the gap between heat exchange hole and heat exchange pipe, because heat exchanger will produce thermal stress in the working process, the material of heat exchange pipe and heat exchange hole will have thermal expansion of different degrees, spacing unit can limit the relative displacement between heat exchange hole and heat exchange pipe through spacing part and fastening part, ensure that heat exchange pipe does not have displacement when thermal expansion, thereby reduce the impact and extrusion to sealing unit, prevent sealing unit from failing because of excessive deformation.

[0065] Obviously, those skilled in the art can make various modifications and variations to the utility model without departing from the spirit and scope of the utility model. Thus, if these modifications and variations of the utility model fall within the scope of the utility model claims and their equivalents, the utility model also intends to include these modifications and variations.

Claims

1. A new type of sealed lower tube sheet of heat exchanger, characterized in that, Include: Lower tube sheet body, heat exchange pipe, limiting unit and sealing unit; The lower tube sheet body is provided with a plurality of heat exchange holes; The heat exchange pipe is arranged in the heat exchange hole, one end of the heat exchange pipe is expanded and / or welded with the inner side wall of the heat exchange hole, and the heat exchange pipe is used for circulating heat exchange fluid; The limiting unit includes a limiting part and a fastening part, the fastening part is arranged on the heat exchange pipe, the limiting part is arranged on both sides of the fastening part, the fastening part abuts against the limiting part, and the limiting part is used for limiting the sealing unit; The sealing unit is arranged on one side of the limiting part, and the sealing unit is used for sealing the gap between the heat exchange hole and the heat exchange pipe.

2. The new type sealed lower tube sheet of heat exchanger according to claim 1, characterized in that, The limiting part includes a limiting arm, a limiting rod and a limiting block, the limiting rod is fixedly connected to the heat exchange pipe at equal intervals, the limiting block is fixedly connected with the limiting rod, a limiting arm is fixedly penetrated through the limiting block, and the limiting arm abuts against the fastening part at both ends.

3. The new type sealed lower tube sheet of heat exchanger according to claim 2, characterized in that, The fastening part includes a first limiting ring and a second limiting ring, the first limiting ring and the second limiting ring are arranged on both sides of the limiting arm respectively, and the first limiting ring and the second limiting ring are used for limiting the limiting arm.

4. The new type sealed lower tube sheet of heat exchanger according to claim 3, characterized in that, The sealing unit includes a sealing sleeve and a sealing ring, one end of the sealing sleeve is fixedly connected with the sealing ring, and the other side of the sealing sleeve abuts against the first limiting ring.

5. The new type sealed lower tube sheet of heat exchanger according to claim 4, characterized in that, The sealing sleeve is matched with the heat exchange pipe, and three sealing rings are fixedly connected to the outer side of one end of the sealing sleeve.

6. The new type sealed lower tube sheet of heat exchanger according to claim 1, characterized in that, It also includes a flow guide part, the flow guide part includes a first flow guide hole, the first flow guide hole is arranged on one side of the heat exchange pipe, the hole wall of the first flow guide hole is inclined, and the inclination angle of the hole wall of the first flow guide hole is 45°.

7. The new type sealed lower tube sheet of heat exchanger according to claim 6, characterized in that, The flow guide part also includes a second flow guide hole, the second flow guide hole is arranged in the middle of the heat exchange pipe, the hole wall of the second flow guide hole is inclined, the inclination angle of the hole wall of the second flow guide hole is 45°, and the diameter of the hole wall of the second flow guide hole is greater than that of the first flow guide hole.

8. The new type sealed lower tube sheet of heat exchanger according to claim 6, characterized in that, The flow guide part also includes a third flow guide hole, the third flow guide hole is arranged in axial symmetry with the first flow guide hole and the second flow guide hole, the hole wall of the third flow guide hole is inclined, the inclination angle of the hole wall of the third flow guide hole is 45°, and the diameter of the hole wall of the third flow guide hole is greater than that of the second flow guide hole.

9. The new type sealed lower tube sheet of heat exchanger according to claim 6, characterized in that, The flow guide part also includes a fourth flow guide hole, the fourth flow guide hole is arranged at one end of the heat exchange pipe, the single-side hole wall of the fourth flow guide hole is inclined, and the inclination angle of the hole wall of the fourth flow guide hole is 45°.

Images