A double tube plate reinforced support anti-vibration tube heat exchanger

Abstract

The utility model relates to a kind of anti-vibration tube bank heat exchanger of double-tube-plate reinforced support, it includes shell, tube sheet, heat exchange tube and shock-absorbing mechanism, heat exchange tube is set in shell, two groups of tube sheet are set in the both ends of heat exchange tube, the shell body of shell is uniformly provided with connecting cavity at head, the diameter of connecting cavity is greater than the diameter of shell, shock-absorbing mechanism is set in the connecting cavity, shock-absorbing mechanism includes buffer plate and elastic component, tube sheet is sealingly fixed in connecting cavity, buffer plate is connected with tube sheet by elastic component, overflow hole is opened on buffer plate, spring is distributed along the annular array distribution of tube sheet axis, can provide balanced elastic support for buffer plate in each direction, when heat exchanger operates, high-speed water flow impacts buffer plate, buffer plate first receives water flow impact force by preposition structure, the honeycomb array design of overflow hole makes water flow produce shunt and speed attenuation, converts impact kinetic energy into internal energy of fluid turbulence, directly weakens initial impact force.

Description

Technical Field

[0001] This utility model relates to the field of shell and tube heat exchangers, and in particular to a vibration-resistant shell and tube heat exchanger with double tube sheet reinforcement support. Background Technology

[0002] During operation, the fluid scours the tube bundle laterally in the shell side of a tube bundle heat exchanger. Due to changes in operating conditions and the complexity of the flow state, the heat exchange tubes will always experience vibrations of varying degrees. The sources of vibration include vibrations generated by stable fluid flow, fluctuations in fluid velocity, and dynamic mechanical vibrations propagated through pipes or other connecting parts. Lateral flow is the main source of fluid-induced tube bundle vibration.

[0003] This vibration causes repeated collisions between the heat exchange tubes and the edges of the baffle tube holes, forming wear grooves in the middle of the support span. In severe cases, it can lead to tube wall perforation and leakage. Furthermore, the welding / expansion joints between the tube sheet and the heat exchange tubes develop microcracks due to alternating stress, resulting in a high medium leakage rate. Utility Model Content

[0004] To solve the above-mentioned technical problems, this utility model provides a vibration-resistant shell-and-tube heat exchanger with double tube sheet reinforcement support.

[0005] The present invention provides a vibration-resistant shell-and-tube heat exchanger with reinforced double tube sheet support, which adopts the following technical solution:

[0006] A vibration-resistant shell-and-tube heat exchanger with reinforced support by double tube sheets includes a shell, tube sheets, heat exchange tubes, and a damping mechanism. The heat exchange tubes are disposed inside the shell, and two sets of tube sheets are disposed at both ends of the heat exchange tubes. The shell body and the end caps of the shell are provided with connecting cavities, the diameter of which is larger than the diameter of the shell. The damping mechanism is disposed inside the connecting cavities and includes a buffer plate and an elastic component. The tube sheets are sealed and fixed inside the connecting cavities, and the buffer plate is connected to the tube sheets through the elastic component. An overflow hole is provided on the buffer plate.

[0007] Optionally, the elastic component is a spring.

[0008] Optionally, the elastic component is a rubber elastic support, specifically including a first fixing block, a second fixing block, a connecting block, a connecting rod, a compression shaft, and rubber strips. The first fixing block is fixed to the tube sheet, and the second fixing block is fixed to the buffer plate. Both the first fixing block and the second fixing block are hinged to the connecting block via the connecting rod. The connecting block has two sets of mounting cavities inside, and the rubber strips are installed at the four corners of each set of mounting cavities. The end of the connecting rod is fixed to the compression shaft, which is inserted into the mounting cavity. The compression shaft has a square cross-section, and all four sides of the compression shaft abut against the rubber strips.

[0009] Optionally, the rubber strip is also provided inside the fixing block one and fixing block two, and the two ends of the connecting rod are fixed to the extrusion shaft.

[0010] Optionally, the rubber strip is made of neoprene rubber, and the surface of the rubber strip is provided with wavy raised texture, with a raised height of 1-2mm.

[0011] Optionally, the overflow holes are distributed in a honeycomb array on the buffer plate, with the diameter of a single overflow hole being 5-10 mm, and the center-to-center distance between adjacent overflow holes being 1.5-2 times the hole diameter. The total flow area of ​​the overflow holes is 1.2-1.5 times the total cross-sectional area of ​​the heat exchange tubes, to ensure smooth medium flow and reduce fluid resistance.

[0012] In summary, this utility model has at least one of the following beneficial technical effects:

[0013] 1. The springs are arranged in a ring array along the tube sheet axis, which can provide balanced elastic support for the buffer plate in all directions. When the heat exchanger is running, the high-speed water flow impacts the buffer plate. The buffer plate, with its front structure, first bears the impact force of the water flow. The honeycomb array design of the overflow hole causes the water flow to be diverted and the velocity to be attenuated, converting the impact kinetic energy into the internal energy of fluid turbulence, directly weakening the initial impact force. The springs absorb vibration energy through compression deformation, which greatly reduces the direct impact on the tube sheet.

[0014] 2. When water flows and impacts the buffer plate, the multi-point force characteristics of the rubber strip improve the uniformity of stress distribution in the tube sheet, avoid local stress concentration caused by spring point contact, effectively prevent tube sheet deformation and increased tube bundle vibration. The high elasticity and aging resistance of neoprene rubber can adapt to long-term stress and maintain stable support.

[0015] 3. The total flow area of ​​the overflow orifice is 1.2-1.5 times the total cross-sectional area of ​​the heat exchange tubes to ensure smooth medium flow and reduce fluid resistance. It avoids fluid blockage caused by insufficient flow area. Under high flow conditions, this design can ensure that the medium passes through the buffer plate without obstruction, maintain a stable flow rate, and prevent additional impact on the tube sheet due to sudden changes in flow rate. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of a vibration-resistant shell-and-tube heat exchanger with double tube sheet reinforcement support.

[0017] Figure 2 This is a schematic diagram of the tube sheet and the damping mechanism.

[0018] Figure 3 yes Figure 1 Enlarged view of part A in the middle.

[0019] Figure 4 This is a schematic diagram of the shock absorption component in Embodiment 2.

[0020] Figure 5 This is a cross-sectional view of the shock-absorbing component in Embodiment 2.

[0021] Explanation of reference numerals in the attached drawings: 1. Shell; 2. Tube sheet; 3. Heat exchange tube; 4. Shock absorption mechanism; 41. Buffer plate; 411. Overflow hole; 42. Elastic component; 421. Fixing block one; 422. Fixing block two; 423. Connecting block; 424. Connecting rod; 425. Extrusion shaft; 426. Rubber strip; 5. Connecting cavity. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0024] Furthermore, "several" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0025] This utility model discloses a vibration-resistant shell-and-tube heat exchanger with double tube sheet reinforcement support.

[0026] Example 1

[0027] Reference Figure 1-2A double-tube sheet reinforced support anti-vibration shell-and-tube heat exchanger includes a shell 1, tube sheets 2, heat exchange tubes 3, and a damping mechanism 4. The heat exchange tubes 3 are disposed inside the shell 1, and two sets of tube sheets 2 are disposed at both ends of the heat exchange tubes 3. A connecting cavity 5 is provided at both the shell body and the end cap of the shell 1. The diameter of the connecting cavity 5 is larger than the diameter of the shell 1. The damping mechanism 4 is disposed inside the connecting cavity 5. The damping mechanism 4 includes a buffer plate 41 and an elastic component 42. The tube sheet 2 is sealed and fixed inside the connecting cavity 5. The buffer plate 41 is connected to the tube sheet 2 through the elastic component 42. An overflow hole 411 is provided on the buffer plate 41. The elastic component 42 is specifically a plurality of springs arranged in a ring array along the axis of the tube sheet 2.

[0028] With this design, the springs are distributed in a ring array along the axis of the tube sheet 2, which can provide balanced elastic support for the buffer plate 41 in all directions. When the heat exchanger is running, the high-speed water flow impacts the buffer plate 41. The buffer plate 41 takes the impact force of the water flow first due to its front structure. The honeycomb array design of the overflow hole 411 causes the water flow to be diverted and the velocity to be attenuated, which converts the impact kinetic energy into the internal energy of the fluid turbulence, directly weakening the initial impact force. The spring absorbs the vibration energy through compression deformation, which greatly reduces the direct impact on the tube sheet 2.

[0029] In the first embodiment described above, the spring as an elastic component 42 still has certain defects. The spring is a point contact or line contact, which is prone to uneven load when the tube sheet 2 is subjected to force, resulting in uneven deformation of the tube sheet 2 and even aggravating the vibration of the tube bundle. Therefore, the second embodiment is proposed below.

[0030] Example 2

[0031] refer to Figure 1-4 The elastic component 42 is a rubber elastic support, specifically including a first fixing block 421, a second fixing block 422, a connecting block 423, a connecting rod 424, a compression shaft 425, and a rubber strip 426. The first fixing block 421 is fixed to the tube sheet 2, and the second fixing block 422 is fixed to the buffer plate 41. Both the first fixing block 421 and the second fixing block 422 are hinged to the connecting block 423 through the connecting rod 424. The connecting block 423 has two sets of mounting cavities inside, and rubber strips are installed at the four corners of each set of mounting cavities. Rubber strip 426, the end of connecting rod 424 is fixed to extrusion shaft 425, extrusion shaft 425 is inserted into the installation cavity, the cross section of extrusion shaft 425 is square, and all four sides of extrusion shaft 425 are pressed against rubber strip 426. Rubber strip 426 is also provided in fixing block 1 421 and fixing block 2 422. Both ends of connecting rod 424 are fixed to extrusion shaft 425. Rubber strip 426 is made of neoprene rubber, and the surface of rubber strip 426 is provided with wavy raised texture, with a raised height of 1-2mm.

[0032] When the elastic component 42 receives pressure, the rubber strip 426 and the extrusion shaft 425 form a surface contact on all four sides. Compared with the point / line contact of the spring, this can distribute the load more evenly and avoid uneven deformation of the tube sheet 2. The rubber elastic support achieves surface contact support between the buffer plate 41 and the tube sheet 2 through the cooperation of the connecting rod 424, the extrusion shaft 425 and the rubber strip 426. When water flows and impacts the buffer plate 41, the multi-point force characteristics of the rubber strip 426 improve the uniformity of stress distribution in the tube sheet 2, avoid local stress concentration caused by the point contact of the spring, effectively prevent deformation of the tube sheet 2 and aggravation of tube bundle vibration. The high elasticity and aging resistance of neoprene rubber can adapt to long-term stress and maintain stable support.

[0033] Overflow holes 411 are arranged in a honeycomb array on the buffer plate 41. The diameter of a single overflow hole 411 is 5-10 mm, and the center-to-center distance between adjacent overflow holes 411 is 1.5-2 times the hole diameter. The total flow area of ​​the overflow holes 411 is 1.2-1.5 times the total cross-sectional area of ​​the heat exchange tubes 3. This design ensures smooth medium flow and reduces fluid resistance, avoiding fluid blockage caused by insufficient flow area. Under high flow conditions, this design ensures that the medium passes through the buffer plate 41 without obstruction, maintains a stable flow rate, and prevents additional impact on the tube sheet 2 due to sudden changes in flow rate. The above are preferred embodiments of this utility model, and are not intended to limit the scope of protection of this utility model. Therefore, all equivalent changes made according to the structure, shape, and principle of this utility model should be covered within the scope of protection of this utility model.

Claims

1. A vibration-resistant shell-and-tube heat exchanger with double tube sheet reinforcement support, characterized in that: The device includes a shell (1), tube sheet (2), heat exchange tube (3), and shock absorption mechanism (4). The heat exchange tube (3) is disposed inside the shell (1). Two sets of tube sheets (2) are disposed at both ends of the heat exchange tube (3). The shell body and the end cap of the shell (1) are provided with connecting cavities (5). The diameter of the connecting cavity (5) is larger than the diameter of the shell (1). The shock absorption mechanism (4) is disposed inside the connecting cavity (5). The shock absorption mechanism (4) includes a buffer plate (41) and an elastic component (42). The tube sheet (2) is sealed and fixed inside the connecting cavity (5). The buffer plate (41) is connected to the tube sheet (2) through the elastic component (42). An overflow hole (411) is provided on the buffer plate (41).

2. The anti-vibration shell-and-tube heat exchanger with double tube sheet reinforcement support according to claim 1, characterized in that: The elastic component (42) is a spring.

3. The anti-vibration shell-and-tube heat exchanger with double tube sheet reinforcement support according to claim 1, characterized in that: The elastic component (42) is a rubber elastic support, specifically including a first fixing block (421), a second fixing block (422), a connecting block (423), a connecting rod (424), a pressing shaft (425), and a rubber strip (426). The first fixing block (421) is fixed to the tube sheet (2), and the second fixing block (422) is fixed to the buffer plate (41). The first fixing block (421) and the second fixing block (422) are both hinged to the connecting block (423) through the connecting rod (424). The connecting block (423) has two sets of mounting cavities inside. The rubber strip (426) is set at the four corners of each set of mounting cavities. The end of the connecting rod (424) is fixed to the pressing shaft (425). The pressing shaft (425) is inserted into the mounting cavity. The cross-section of the pressing shaft (425) is square, and all four sides of the pressing shaft (425) abut against the rubber strip (426).

4. The anti-vibration shell-and-tube heat exchanger with double tube sheet reinforcement support according to claim 3, characterized in that: The rubber strip (426) is also provided in the first fixing block (421) and the second fixing block (422), and the two ends of the connecting rod (424) are fixed to the extrusion shaft (425).

5. The anti-vibration shell-and-tube heat exchanger with double tube sheet reinforcement support according to claim 4, characterized in that: The rubber strip (426) is made of neoprene rubber, and the surface of the rubber strip (426) is provided with wavy raised texture, with a raised height of 1-2mm.

6. The anti-vibration shell-and-tube heat exchanger with double tube sheet reinforcement support according to claim 1, characterized in that: The overflow holes (411) are distributed in a honeycomb array on the buffer plate (41). The diameter of a single overflow hole (411) is 5-10 mm, and the center-to-center distance between adjacent overflow holes (411) is 1.5-2 times the diameter. The total flow area of ​​the overflow holes (411) is 1.2-1.5 times the total cross-sectional area of ​​the heat exchange tubes (3) to ensure smooth medium flow and reduce fluid resistance.

Images