Flange device for fixing heat exchanger

Abstract

The utility model relates to the technical field of heat exchangers, in particular to a flange device for fixing a heat exchanger, which comprises a fixing unit comprising two first fixing parts and two second fixing parts, the two first fixing parts are respectively connected with a tube plate, the two second fixing parts are arranged at two ends of a shell on the other side of the tube plate, and the first fixing parts and the second fixing parts are respectively connected with the tube plate. A plurality of cross-shaped through holes are formed in the second fixing part at equal intervals; the locking unit comprises a first locking piece and a second locking piece, the first locking piece is arranged on one side of the first fixing part, the second locking piece is arranged on one side of the second fixing part, and the first locking piece and the second locking piece are locked in a matched mode through a plurality of cross-shaped through holes. Through the locking effect of the locking unit, the fixing unit is tightly attached to the tube plate, the sealing performance is enhanced, and the leakage problem caused by long-term use is prevented.

Description

TECHNICAL FIELD

[0001] The utility model relates to heat exchanger technical field, specifically, relate to a flange device for heat exchanger fixing. BACKGROUND

[0002] The pipe heat exchanger is a kind of widely used in industrial field high-efficiency heat exchange equipment, its main function is between two different temperature fluids by pipe and shell heat transfer, simultaneously keep two fluids not direct contact.But the fixed flange of the pipe heat exchanger of prior art only uses a gasket to seal, in the heat exchange process of heat exchanger, the change of temperature difference will produce thermal stress between pipe and shell.This thermal stress can cause the deformation of pipe or shell, and the mechanical vibration in the heat exchange process of heat exchanger also can cause the fastener loosening of flange connection, thereby influence the tightness of flange connection.

[0003] Therefore, a flange device for heat exchanger fixing is needed to solve the problems in the prior art. UTILITY MODEL CONTENTS

[0004] Therefore, the utility model provides a flange device for heat exchanger fixing, to solve the problem of poor sealing performance of the existing flange connecting piece.

[0005] The utility model provides a flange device for heat exchanger fixing, it includes:

[0006] Be applied to the shell and tube heat exchanger, the shell and tube heat exchanger includes: shell, tube bundle, tube sheet and baffle, its characterized in that, the flange device for heat exchanger fixing includes:

[0007] Fixed unit, including first fixed part and second fixed part, the first fixed part with the second fixed part are provided with two, two the first fixed part is connected with the tube sheet respectively, two the second fixed part is arranged at the shell both ends of the other side of the tube sheet, equidistantly be provided with a plurality of cross holes on the second fixed part;

[0008] Locking unit, including first locking piece and second locking piece, the first locking piece is arranged at one side of the first fixed part, the second locking piece is arranged at one side of the second fixed part, the first locking piece and second locking piece are locked through a plurality of cross holes.

[0009] Further, the first locking piece includes first locking rod and first locking block, first threaded hole is formed in the first locking block, outer thread is arranged on the both ends of the first locking rod, the outer thread of one end of the first locking rod is connected with the first threaded hole.

[0010] Furthermore, the first locking member also includes a second threaded hole, which is formed on one side of the first locking block.

[0011] Furthermore, the second locking component includes a first locking sleeve, a cross locking component, a second locking rod, and a second locking block. The first locking sleeve has a third threaded hole, which is connected to the external thread at the other end of the first locking rod. One end of the first locking sleeve is fixedly connected to the cross locking component, and the other side of the cross locking component is rotatably connected to the second locking rod. The second locking block is fixedly connected to the second locking rod.

[0012] Furthermore, the first fixing part includes a first end cap, a first fixing sleeve, and a first water-blocking plate. The first end cap is fixedly connected to the first fixing sleeve. The first fixing sleeve has fourth threaded holes equidistantly opened. One end of the first water-blocking plate is connected to the tube sheet, and the other end is fixedly connected to the first end cap.

[0013] Furthermore, the second fixing part includes a fixing plate and a fifth threaded hole. The fixing plate has fifth threaded holes equidistantly spaced, and the fifth threaded holes correspond to the fourth threaded holes.

[0014] Furthermore, the second fixing part also includes a first limiting plate. Two first limiting plates are provided on the cross through hole. The first limiting plates are arranged symmetrically about the center of the through hole. The first limiting plates are used to limit the cross locking member.

[0015] Furthermore, it also includes bolts and nuts, with nuts provided at both ends of the bolts, and the bolts passing through the tube sheet, the second threaded hole, the fourth threaded hole, and the fifth threaded hole.

[0016] Furthermore, the surface of the flange device for fixing the heat exchanger is coated with a high-temperature anti-corrosion coating.

[0017] Compared with existing technologies, the advantages of this invention are as follows: By setting fixing units on both sides of the tube sheet, the first and second fixing parts are made to fit against the tube sheet. Simultaneously, the second fixing part has a cross-shaped through hole. The first and second locking members are inserted into the cross-shaped through hole to lock the first and second fixing parts, ensuring a tight fit against the tube sheet. This not only improves the overall structural stability and seismic performance but also prevents loosening or leakage caused by prolonged use or changes in the external environment. The tight fit between the fixing unit and the tube sheet disperses and withstands the impact of internal and external pressure fluctuations on the tube sheet, reducing stress concentration and lowering the risk of tube sheet deformation or damage. Compared with traditional single-locking structures, the cross-shaped through-hole locking method has higher torsional resistance, maintaining a firm connection even under high flow or high pressure conditions, ensuring the safe and stable operation of the pipeline. It also reduces the impact of thermal expansion and contraction on pipeline connections, avoiding poor sealing or loosening caused by temperature differences, thereby extending the pipeline maintenance cycle. Attached Figure Description

[0018] Figure 1 A cross-sectional view of a flange device for fixing a heat exchanger provided in an embodiment of this utility model;

[0019] Figure 2 A schematic diagram of a locking unit in a heat exchanger fixing flange device provided in an embodiment of this utility model;

[0020] Figure 3 A schematic diagram of the second fixing part in a heat exchanger fixing flange device provided in an embodiment of this utility model;

[0021] Figure 4 This is a cross-sectional view of the first fixing part in a heat exchanger fixing flange device provided in an embodiment of the present utility model.

[0022] The components include: 1. Shell; 2. Tube bundle; 3. Baffle; 4. Fixing unit; 410. First fixing part; 4101. First end cap; 4102. First fixing sleeve; 4103. First water-blocking plate; 420. Second fixing part; 4201. Fixing plate; 430. Cross through hole; 440. First limiting plate; 5. Locking unit; 510. First locking element; 5101. First locking rod; 5102. First locking block; 520. Second locking element; 5201. First locking sleeve; 5202. Cross locking element; 5203. Second locking rod; 5204. Second locking block; 6. Bolt. Detailed Implementation

[0023] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0024] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0025] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0026] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0027] See Figure 1 , Figure 2 As shown, this embodiment provides a flange device for fixing a heat exchanger, comprising: applied to a shell-and-tube heat exchanger, the shell-and-tube heat exchanger comprising: a shell 1, a tube bundle 2, a tube sheet, and a baffle 3, characterized in that the flange device for fixing the heat exchanger comprises:

[0028] The fixing unit 4 includes a first fixing part 410 and a second fixing part 420. There are two first fixing parts 410 and two second fixing parts 420. The two first fixing parts 410 are respectively connected to the tube sheet. The two second fixing parts 420 are disposed at both ends of the housing 1 on the other side of the tube sheet. A number of cross through holes 430 are equidistantly arranged on the second fixing part 420.

[0029] The locking unit 5 includes a first locking member 510 and a second locking member 520. The first locking member 510 and the second locking member 520 are respectively disposed on one side of the first fixing part 410 and the second fixing part 420. The first locking member 510 and the second locking member 520 are locked together by a plurality of cross through holes 430.

[0030] Specifically, a shell-and-tube heat exchanger typically includes a shell 1, heat exchange tubes, a tube sheet, and baffles 3. The tube sheet connects the heat exchange tubes, the shell 1 surrounds the heat exchange tubes, and the baffles 3 are located inside the shell 1. In existing shell-and-tube heat exchangers, the tube sheet is directly connected to a sealing flange, sealed by a gasket. After prolonged use, this can lead to gasket corrosion and fluid leakage. In this embodiment, a first fixing part 410 and a second fixing part 420 are provided on both sides of the tube sheet. The first fixing part 410 is cylindrical, sealed at one end, and connected to the tube sheet at the other end by a bolt 6, which passes through the first fixing part. 410. A tube sheet and a second fixing part 420 are provided. The second fixing part 420 is provided on the outer surface of the housing 1 on the other side of the tube sheet and is connected to the tube sheet. The locking unit 5 includes a first locking member 510 and a second locking member 520. The first locking member 510 is provided on one side of the first fixing part 410, and the second locking member 520 is provided on one side of the second fixing part 420. One end of the first locking member 510 is fixedly connected to the first fixing part 410 by a bolt 6, and the other end is connected to the second locking member 520 through the cross through hole 430 of the second fixing part 420, thereby achieving the effect of sealing and locking the tube sheet.

[0031] Understandably, in traditional shell-and-tube heat exchangers, the connection between the tube sheet and the sealing flange typically relies on gasket sealing. Over time, gaskets age, become damaged, or corrode due to factors such as high temperature, pressure, and corrosion, leading to decreased sealing performance and fluid leakage. This embodiment, however, achieves a more stable and reliable sealing method by providing a first fixing part 410 and a second fixing part 420 on both sides of the tube sheet, and employing a bolt 6 connection and a cross-hole locking mechanism 430. The fixing unit 4 not only strengthens the connection between the tube sheet and the shell but also achieves a stronger sealing effect through the locking unit 5, preventing leakage caused by gasket damage. This improved sealing effect allows the heat exchanger to maintain a good sealing state during long-term operation, ensuring no fluid leakage and reducing environmental pollution and operational risks. Compared to traditional gasket connections, the bolt 6 connection and cross-hole locking structure of the first fixing part 410 and the second fixing part 420 prevent seal failure due to corrosion. In shell-and-tube heat exchanger applications, the fluids are typically at high temperatures and are corrosive. The combination of fixing and locking components reduces corrosion of the sealing components, ensuring stable sealing performance over long periods, thereby lowering replacement costs and the frequency of downtime maintenance. Simultaneously, the overall structural stability of the heat exchanger is improved. It can disperse pressure fluctuations generated during fluid and heat exchange processes. The connection between the tube sheet and the shell 1 is secured by bolts 6, preventing loosening or detachment caused by prolonged thermal expansion, contraction, and pressure fluctuations. This not only allows it to withstand higher operating pressures but also prevents poor sealing at pipe joints or tube sheet loosening when dealing with thermal expansion and contraction of the heat exchanger, enhancing the heat exchanger's pressure resistance and durability. Compared to traditional sealing flange devices, the combination of the first locking element 510 and the second locking element 520 simplifies installation and disassembly. When periodic inspections, cleaning, or component replacements of the heat exchanger are required, it reduces the complexity and labor intensity of manual operations. The simple connection of bolt 6 makes the overall installation process more efficient, and the cross-shaped through-hole 430 structure facilitates quick tightening and loosening of fixed components, reducing the risk of damage caused by improper operation. A tighter seal prevents fluid leakage and unnecessary heat loss, thereby improving the heat exchanger's heat exchange efficiency. Better sealing allows for smoother fluid flow and higher heat transfer efficiency. Furthermore, avoiding cooling water leakage and heat loss caused by poor sealing improves the heat exchanger's operating efficiency.

[0032] In some embodiments of this application, the first locking member 510 includes a first locking rod 5101 and a first locking block 5102. The first locking block 5102 has a first threaded hole, and the first locking rod 5101 has external threads at both its upper and lower ends. The external thread at one end of the first locking rod 5101 is engaged with the first threaded hole.

[0033] In some embodiments of this application, the first locking member 510 further includes a second threaded hole, which is formed on one side of the first locking block 5102.

[0034] Specifically, the first locking member 510 is disposed on one side of the first fixing part 410. The first locking member 510 includes a first locking rod 5101 and a first locking block 5102. The first locking block 5102 is provided with a first threaded hole, which is connected to the first locking rod 5101. The first locking block 5102 is provided with a second threaded hole, which corresponds to the threaded hole on the tube sheet. The first locking block 5102 fits against the first fixing part 410 and is fixedly connected to the tube sheet through the second threaded hole. The first locking rod 5101 corresponds to the position of the cross through hole 430.

[0035] Understandably, the first locking element 510, the first locking rod 5101, and the first locking block 5102, through the engagement of the threaded hole and the external thread, enable the fixing unit 4 to achieve a reliable locking effect. The first locking element 510, through the combination of the first locking block 5102 and the first locking rod 5101, ensures a tight connection between the tube sheet and the fixing components while effectively preventing loosening and leakage during long-term use. The precisely fitted threaded connection provides strong anti-torsional strength to the connection between the first locking rod 5101 and the first threaded hole, ensuring that the component maintains a secure locking state even under high pressure and high temperature environments. The engagement of the second threaded hole with the threaded hole on the tube sheet further enhances the stability of the connection, effectively preventing loosening or leakage caused by pressure fluctuations inside and outside the pipeline, thermal expansion and contraction, etc., ensuring the long-term safe operation of the equipment. The first locking element 510, through the threaded connection, firmly fixes the connection between the locking rod, locking block, and tube sheet, providing a stable and deformation-resistant locking structure. During long-term operation of a heat exchanger, the connection between the tube sheet and the shell may loosen or leak due to expansion or vibration caused by fluid flow and temperature fluctuations, especially at high pressures. This loosening can lead to serious safety hazards. By incorporating external threads and threaded holes on the first locking element 510, a tighter connection can be achieved, making the connection between the first fixing part 410 and the tube sheet more secure. This prevents structural loosening or leakage caused by pressure and temperature changes, thereby improving the heat exchanger's sealing performance and stability. Traditional shell-and-tube heat exchangers often use gasket sealing technology. Over time, gaskets are prone to aging, corrosion, and wear, leading to a decrease in sealing effectiveness and potentially causing fluid leakage, posing safety hazards. In this structure, the connection between the first locking element 510 and the tube sheet does not rely on gaskets but achieves a sealing effect through mechanical locking and threaded engagement, reducing problems caused by gasket aging and corrosion. This structure prevents fluid leakage, improving safety and reducing maintenance costs. Maintenance personnel do not need to frequently inspect and replace gaskets, reducing downtime and maintenance costs caused by sealing problems. Furthermore, the adjustability of the locking element allows for quick adjustment and retightening when necessary, thereby improving the convenience and efficiency of maintenance. In the high-pressure operating environment of the heat exchanger, the pipes need to withstand significant internal and external pressure fluctuations, and are particularly sensitive to thermal expansion and contraction effects. The structure of the first locking element 510, through the tight fit between the threaded hole and the external thread, enhances the overall structural strength. The connection between the first locking block 5102 and the first fixing part 410 can withstand higher stresses, preventing loosening or detachment between the tube sheet and the shell 1, and ensuring the stability of the heat exchanger under high pressure and high temperature environments.

[0036] In some embodiments of this application, the second locking member 520 includes a first locking sleeve 5201, a cross locking member 5202, a second locking rod 5203, and a second locking block 5204. The first locking sleeve 5201 has a third threaded hole, which is connected to the external thread of the other end of the first locking rod 5101. One end of the first locking sleeve 5201 is fixedly connected to the cross locking member 5202, and the other side of the cross locking member 5202 is rotatably connected to the second locking rod 5203. The second locking block 5204 is fixedly connected to the second locking rod 5203.

[0037] Specifically, the first locking sleeve 5201 has a third threaded hole, which corresponds to the external thread of the first locking rod 5101. The lower end of the first locking sleeve 5201 is fixedly connected to the cross locking member 5202. The lower center of the cross locking member 5202 is rotatably connected to the second locking rod 5203. The lower end of the second locking rod 5203 is fixedly connected to the second locking block 5204. When it is necessary to seal and lock the tube sheet, the second locking member 520 on the first locking block 5102 is aligned with the cross through hole 430. At this time, the second locking block 5204 passes through the cross through hole 430 and is located on the side of the second fixing part 420 close to the housing 1. At the same time, the first locking rod 5101 and the second locking block 5204 are rotated to lock the first fixing part 410 and the second fixing part 420 through the threads.

[0038] Understandably, the second locking element 520, through threaded engagement and rotational connection, forms a multi-layered, robust locking structure. First, the connection between the third threaded hole and the external thread of the first locking rod 5101 ensures the longitudinal stability of the first locking sleeve 5201, preventing loosening due to pressure fluctuations or vibration. Second, the first locking sleeve 5201 is fixedly connected to the cross locking element 5202, which, through rotational connection with the second locking rod 5203, further enhances the adjustability and flexibility of the locking. During the sealing operation, rotating the first locking rod 5101 drives the second locking block 5204 to penetrate through the cross through-hole 430, thereby locking the connection between the tube sheet and the fixed part, achieving a sealing effect. This structure, through threaded and rotational mechanisms, ensures tightness while also ensuring that the sealing part is not affected by external changes, improving overall sealing performance, avoiding safety hazards caused by leakage, and coping with various pressure, temperature, and vibration factors that the heat exchanger may encounter during operation. During operation, especially under high pressure and high temperature environments, shell-and-tube heat exchangers are prone to loosening or deformation of connecting components. This embodiment, through multi-layered locking and threaded engagement, ensures stability and reliability during the locking process, enabling the structure to remain stable under high temperature, high pressure, and severe vibration conditions. This prevents loosening and seal failure caused by long-term use or external interference, improving the long-term durability of the heat exchanger. Traditional heat exchanger structures rely on gaskets or sealants for sealing, which are prone to aging, corrosion, or wear after prolonged use, leading to fluid leakage. Achieving sealing through mechanical locking and threaded connections not only solves the leakage problems inherent in traditional sealing methods but also reduces maintenance costs caused by leaks. During long-term use, the tubes and tube sheet of the heat exchanger are subjected to constantly changing pressure, temperature, and fluid flow velocity, making structural stability crucial. The second locking element 520, through a combination of threaded connection and rotation, provides multiple locking forces in the longitudinal and transverse directions. The tight connection between the tube sheet and the fixed part resists deformation and loosening caused by internal and external pressure fluctuations, thereby improving the structure's pressure resistance and seismic performance. Compared to traditional gasket sealing methods, the second locking element 520 makes the installation and disassembly process simpler and more efficient. The first locking element 510 and the second locking element 520, through threaded and rotary connections, facilitate the connection between the tube sheet and the fixed part.

[0039] In some embodiments of this application, see Figure 4 As shown, the first fixing part 410 includes a first end cap 4101, a first fixing sleeve 4102 and a first water-blocking plate 4103. The first end cap 4101 is fixedly connected to the first fixing sleeve 4102. The first fixing sleeve 4102 is provided with fourth threaded holes at equal intervals. One end of the first water-blocking plate 4103 is connected to the tube sheet, and the other end is fixedly connected to the first end cap 4101.

[0040] Specifically, the first end cap 4101 is a sealed structure with a through hole. The first fixing sleeve 4102 is fixedly connected to the outer surface of the first end cap 4101 near the through hole. The first fixing sleeve 4102 has four threaded holes equidistantly provided. The first water baffle 4103 is fixedly connected inside the first end cap 4101. The fourth threaded holes correspond to the holes on the tube sheet, so that the first end cap 4101 can be fixed on the tube sheet. The first end cap 4101 usually has an inlet and an outlet. The first water baffle 4103 can isolate the inflowing fluid from the outflowing fluid to prevent mixing and loss of heat exchange efficiency.

[0041] Understandably, the fixed connection between the first end cap 4101 and the first fixed sleeve 4102, combined with the engagement of the fourth threaded hole and the hole on the tube sheet, ensures a tight connection and reduces the risk of fluid leakage. In high-pressure and high-temperature environments, the primary function of the first baffle plate 4103 is to isolate the inflow and outflow fluids from contact, preventing their mixing and improving the heat exchanger's efficiency. The fluids in the heat exchanger are typically heat transfer media or cooling media, which need to exchange heat within the tube bundle 2. If the inflow and outflow fluids mix, it will not only affect the heat exchange process but may also reduce heat exchange efficiency, even wasting energy and causing equipment failure. The first baffle plate 4103 prevents cross-contamination and mixing between fluids, allowing the fluid before and after heat exchange to flow in their respective channels, thereby maximizing heat transfer efficiency. Especially in heat exchangers handling high-temperature and high-pressure fluids, fluid mixing not only affects heat exchange efficiency but may also lead to uneven temperature, localized overheating or undercooling, all of which negatively impact the long-term stability of the heat exchanger.

[0042] In some embodiments of this application, see Figure 3 As shown, the second fixing part 420 includes a fixing plate 4201 and a fifth threaded hole. The fixing plate 4201 has fifth threaded holes equidistantly arranged, and the fifth threaded holes correspond to the fourth threaded holes.

[0043] Specifically, a circular hole is provided in the middle of the fixing plate 4201, the size of which corresponds to the diameter of the shell 1. A fifth threaded hole is provided on the outside of the circular hole of the fixing plate 4201, and a cross through hole 430 is provided above the fifth threaded hole. The fifth threaded hole corresponds to the fourth threaded hole and the hole on the tube plate.

[0044] Understandably, the fifth threaded hole, evenly spaced on the fixing plate 4201, corresponds to the fourth threaded hole, ensuring the stability and precise alignment of the entire fixing part. This prevents loosening or uneven stress distribution caused by errors or asymmetrical assembly. In large equipment such as heat exchangers, installation errors and component loosening are among the root causes of failure. The structure of the fixing plate 4201 allows the various components of the heat exchanger to be fixed in their proper positions, thus preventing component displacement or loosening due to vibration or thermal expansion during operation. The combination of the fixing plate 4201 and the threaded holes enhances pressure resistance, especially under high-pressure conditions. Heat exchangers are frequently affected by internal fluid pressure during operation, especially when the heat medium and cooling medium flow in the pipes, causing significant pressure fluctuations. The fixing plate 4201 and the threaded holes, by providing stable support and fixing force, enable the heat exchanger to better resist these pressure fluctuations, preventing pipes or components from cracking or failing due to excessive stress.

[0045] In some embodiments of this application, the second fixing part 420 further includes a first limiting plate 440. Two first limiting plates 440 are provided on the cross through hole 430. The first limiting plates 440 are arranged symmetrically about the center of the through hole. The first limiting plates 440 are used to limit the cross locking member 5202.

[0046] Specifically, when the locking unit 5 is inserted into the cross through hole 430, the cross locking member 5202 will be limited by the first limiting plate 440. At this time, the cross locking member 5202 will fit against the first limiting plate 440 and the cross through hole 430. The second locking block 5204 has a rectangular structure and its size corresponds to the cross through hole 430. The cross through hole 430 is only provided with the first limiting plate 440 on both sides, so it will not block the passage of the second locking block 5204. Then, by tightening the second locking block 5204 and the first locking rod 5101, the first fixing part 410 and the second fixing part 420 are sealed and locked.

[0047] Understandably, the first limiting plate 440, positioned on the cross-shaped through-hole 430, enhances the stability and reliability of the entire structure. When the cross-shaped locking member 5202 is inserted into the cross-shaped through-hole 430, the first limiting plate 440, through its axially symmetrical structure, limits the cross-shaped locking member 5202, ensuring that it will not shift or loosen during assembly, thus preventing loosening or vibration problems caused by improper or unstable locking member positioning. The stability of the locking member directly affects the safety of the entire equipment, especially in high-temperature, high-pressure, or vibration environments, where its stability is crucial. Through the alignment of the first limiting plate 440, the cross-shaped locking member 5202 maintains consistency with the connection between the first fixing part 410 and the second fixing part 420, avoiding leakage, damage, or failure caused by structural loosening. The constraint of the limiting plate on the locking member ensures that the locking device remains fixed during long-term use, reducing the failure rate caused by loose or shifted components. Sealing is one of the most critical requirements in the heat exchanger structure. By limiting the cross-shaped locking element 5202 with the first limiting plate 440, the installation positions of the second locking block 5204 and the first locking rod 5101 can be controlled, thereby ensuring a sealing effect during the locking process. After locking, the first fixing part 410 and the second fixing part 420 are sealed through the threaded engagement of the second locking block 5204 and the first locking rod 5101, preventing fluid leakage. In actual operation, heat exchangers typically withstand high-temperature and high-pressure environments and are affected by factors such as fluid flow, equipment vibration, and thermal expansion. Under such conditions, any loosening or component displacement can lead to damage or reduced efficiency of the device. Therefore, the stability and sealing performance of the locking element are particularly important. The first limiting plate 440 reduces the risk of displacement due to vibration and pressure fluctuations by limiting the position of the cross-shaped locking element 5202. In practical applications, the equipment structure may be subjected to a certain degree of impact or displacement due to fluid flow and temperature changes. The limiting plate ensures that the cross locking component 5202 is always in the correct position and will not move or deform due to external forces or thermal expansion, thereby improving the shock resistance and pressure resistance of the equipment.

[0048] In some embodiments of this application, a bolt 6 and a nut are also included, with nuts provided at both ends of the bolt 6, and the bolt 6 passes through the tube sheet, the second threaded hole, the fourth threaded hole and the fifth threaded hole.

[0049] Specifically, the second threaded hole on the locking unit 5, the fourth threaded hole on the first fixing part 410, and the fifth threaded hole on the second fixing part 420 correspond to the holes on the tube sheet. Nuts are provided at both ends of the bolt 6. The bolt 6 passes through the second threaded hole, the fourth threaded hole, and the fifth threaded hole. The two ends of the bolt 6 are fixedly connected by the nuts. At this time, one end of the first locking block 5102 is fixed to the first fixing part 410 by the bolt 6. At the same time, the positions of the first locking rod 5101 and the second locking member 520 on the other end of the first locking block 5102 correspond to the positions of the cross through hole 430. Then, by making the cross locking member 5202 on the second locking member 520 fit against the limiting plate on the cross through hole 430, and by tightening the second locking block 5204 and the first locking rod 5101, the locking unit 5 achieves a locking effect, thereby achieving a locking and sealing effect between the first fixing part 410, the tube sheet, and the second fixing part 420.

[0050] Understandably, the bolts 6 and nuts ensure a more secure connection for the entire flange assembly. Bolts 6 pass through multiple threaded holes and are fitted with nuts at both ends, ensuring a tight connection between components. This allows the locking unit 5 to withstand higher mechanical stresses and external impacts, reducing loosening issues caused by vibration, pressure fluctuations, or temperature changes. Especially under high load and high temperature environments, the tensile force of bolts 6 ensures a stable connection between the first locking block 5102, the second locking component, and the tube sheet, preventing structural displacement or loosening due to external factors. Sealing is one of the core requirements of any heat exchanger and sealing device structure. The precise fit of the first locking block 5102 and the second locking component 520 ensures no leakage occurs during operation.

[0051] In some embodiments of this application, the surface of the flange assembly for fixing the heat exchanger is coated with a high-temperature anti-corrosion coating.

[0052] Understandably, in high-temperature, high-pressure, and corrosive environments, the flange surfaces of heat exchangers are frequently subjected to erosion by external media. Corrosion not only damages the structural strength of the equipment but also affects the heat exchanger's operating efficiency and can even lead to equipment failure. High-temperature anti-corrosion coatings can isolate the flange devices from direct contact with external corrosive media (such as acids, alkalis, and salts), thereby reducing the probability of corrosion. High-temperature anti-corrosion coatings typically have strong corrosion resistance and can effectively resist chemical erosion in high-temperature, high-humidity, or other harsh environments. By applying an anti-corrosion coating to the flange surface, the equipment can resist the erosion of external corrosive media, preventing metal surface oxidation, rust, and other forms of corrosion. This not only reduces the frequency of equipment maintenance caused by corrosion but also extends the equipment's service life, thereby reducing maintenance and replacement costs and improving the long-term economic efficiency of the heat exchanger. When heat exchangers operate in high-temperature environments, the equipment surfaces are easily affected by high temperatures, especially parts such as flange devices. High temperatures can cause expansion, thermal stress, oxidation, and other forms of damage to metal materials, thus affecting the performance and safety of the equipment. High-temperature anti-corrosion coatings possess strong high-temperature resistance, preventing damage to flange surfaces caused by high temperatures. These coatings maintain stability at high temperatures, without degradation or performance decline even after prolonged exposure to high temperatures. The coating not only reduces metal oxidation and corrosion at high temperatures but also disperses thermal stress, preventing equipment deformation or cracking caused by temperature variations. By improving the high-temperature resistance of flange devices, long-term stable operation of heat exchangers under high-temperature conditions can be ensured, avoiding malfunctions or performance degradation caused by high temperatures and enhancing equipment safety and reliability.

[0053] The heat exchanger fixing flange device in the above embodiments uses fixing units on both sides of the tube sheet to make the first fixing part and the second fixing part fit against the tube sheet. Simultaneously, the second fixing part has a cross-shaped through hole. The first locking member and the second locking member are inserted into the cross-shaped through hole to lock the first fixing part and the second fixing part, ensuring a tight fit against the tube sheet. This not only improves the overall structural stability and seismic performance but also prevents loosening or leakage caused by prolonged use or changes in the external environment. The tight fit between the fixing unit and the tube sheet disperses and withstands the impact of internal and external pressure fluctuations on the tube sheet, reducing stress concentration and lowering the risk of tube sheet deformation or damage. Compared with traditional single-locking structures, the cross-shaped through-hole locking method has higher torsional resistance. Even under high flow or high pressure environments, it can maintain a firm connection, ensuring the safe and stable operation of the pipeline. It also reduces the impact of thermal expansion and contraction on pipeline connections, avoiding poor sealing or loosening caused by temperature differences, thereby extending the pipeline maintenance cycle.

[0054] Obviously, those skilled in the art can make various modifications and variations to this utility model without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this utility model and their equivalents, this utility model also intends to include these modifications and variations.

Claims

1. A flange device for fixing a heat exchanger, applied to a shell-and-tube heat exchanger, the shell-and-tube heat exchanger comprising: The housing, tube bundle, tube sheet, and baffle plate are characterized in that they include: The fixing unit includes a first fixing part and a second fixing part. There are two of each of the first fixing parts and the second fixing parts. The two first fixing parts are respectively connected to the tube sheet. The two second fixing parts are located at both ends of the housing on the other side of the tube sheet. A plurality of cross-shaped through holes are equidistantly arranged on the second fixing parts. The locking unit includes a first locking member and a second locking member. The first locking member is disposed on one side of the first fixing part, and the second locking member is disposed on one side of the second fixing part. The first locking member and the second locking member are locked together through a plurality of cross-shaped through holes.

2. The flange device for fixing a heat exchanger according to claim 1, characterized in that, The first locking component includes a first locking rod and a first locking block. The first locking block has a first threaded hole. The first locking rod has external threads at both ends. The external thread at one end of the first locking rod is engaged with the first threaded hole.

3. The flange device for fixing a heat exchanger according to claim 2, characterized in that, The first locking element further includes a second threaded hole, which is located on one side of the first locking block.

4. The flange device for fixing a heat exchanger according to claim 3, characterized in that, The second locking component includes a first locking sleeve, a cross locking component, a second locking rod, and a second locking block. The first locking sleeve has a third threaded hole, which is connected to the external thread at the other end of the first locking rod. One end of the first locking sleeve is fixedly connected to the cross locking component, and the other side of the cross locking component is rotatably connected to the second locking rod. The second locking block is fixedly connected to the second locking rod.

5. The flange device for fixing a heat exchanger according to claim 4, characterized in that, The first fixing part includes a first end cap, a first fixing sleeve, and a first water-proof plate. The first end cap is fixedly connected to the first fixing sleeve. The first fixing sleeve has fourth threaded holes equidistantly opened. One end of the first water-proof plate is connected to the tube sheet, and the other end is fixedly connected to the first end cap.

6. The flange device for fixing a heat exchanger according to claim 5, characterized in that, The second fixing part includes a fixing plate and a fifth threaded hole. The fixing plate has fifth threaded holes equidistantly spaced, and the fifth threaded holes correspond to the fourth threaded holes.

7. The flange device for fixing a heat exchanger according to claim 6, characterized in that, The second fixing part also includes a first limiting plate. Two first limiting plates are provided on the cross through hole. The first limiting plates are arranged symmetrically about the center of the through hole. The first limiting plates are used to limit the cross locking member.

8. The flange device for fixing a heat exchanger according to claim 6, characterized in that, It also includes bolts and nuts, with nuts at both ends of the bolts, and the bolts pass through the tube sheet, the second threaded hole, the fourth threaded hole and the fifth threaded hole.

9. The flange device for fixing a heat exchanger according to claim 1, characterized in that, The surface of the flange device for fixing the heat exchanger is coated with a high-temperature anti-corrosion coating.

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