Combined marine heat exchanger

Abstract

The invention discloses a combined marine heat exchanger, and belongs to the technical field of ship engineering, the combined marine heat exchanger comprises two heat exchanger shells, the number of the heat exchanger shells is two, and two fixing discs are fixedly mounted at the positions, close to the top and the bottom, between the inner walls of the heat exchanger shells correspondingly; a plurality of heat exchange tubes are fixedly mounted on the heat exchanger shell through a fixing disc; according to the heat exchanger, the piston rod slides up and down in the piston cylinder in a reciprocating mode to drive the spoiler at the top end of the piston rod to synchronously reciprocate along the outer wall of the heat exchange tube, the spoiler interacts with a shell pass medium in the moving process, and meanwhile the impeller at the top end is driven to synchronously rotate under the impact of the medium; the piston rod drives the spoiler to reciprocate and rotate and disturb the impeller, so that the flow disturbance intensity of a shell pass medium can be enhanced, the flow stability of the medium is broken, a medium retention area on the outer wall of the heat exchange tube is avoided, the heat transfer efficiency is improved, and the stability of the heat exchange performance of equipment is guaranteed.

Description

Technical Field

[0001] This invention belongs to the field of marine engineering technology, and in particular relates to a combined marine heat exchanger. Background Technology

[0002] In ship navigation systems, heat exchangers are core components that ensure the normal operation of critical equipment such as power plants, refrigeration systems, and fuel heating. Their heat exchange performance directly affects the ship's power output efficiency, energy utilization rate, and navigation safety. As the shipbuilding industry develops towards larger and higher speeds, higher requirements are placed on the heat exchange efficiency, operational stability, and space adaptability of marine heat exchangers. Currently, most mainstream marine heat exchangers are based on shell-and-tube structure designs, achieving heat transfer through the counter-flow of media in the tube side and shell side. They are widely used in various thermal cycle systems of ships, providing thermal support for the continuous navigation of ships.

[0003] However, existing marine shell-and-tube heat exchangers still have shortcomings in practical applications. On the one hand, the shell-side medium has strong flow stability, which easily forms stagnant areas on the outer wall of the heat exchange tubes, resulting in local heat exchange dead zones. This not only reduces the instantaneous efficiency of heat transfer but may also cause equipment failure due to excessively high local temperatures. On the other hand, in traditional heat exchange structures, the heat exchange paths between the tube-side and shell-side media are relatively short, making it difficult for the two media to fully contact each other. At the same time, the heat exchange tube layout is mostly in single series or parallel configuration, which easily leads to uneven distribution of medium flow velocity and excessively high local flow velocity, resulting in insufficient heat exchange. This cannot meet the demand for efficient heat exchange under high-load operation of ships. In order to solve the above problems, there is an urgent need for a combined marine heat exchanger that can enhance shell-side medium disturbance, extend the heat exchange path, and optimize the medium flow velocity distribution. Summary of the Invention

[0004] The purpose of this invention is to address the problems of traditional marine heat exchangers, where the shell-side medium flow is highly unstable, easily forming stagnant areas on the outer wall of the heat exchange tubes, leading to local heat exchange dead zones. This not only reduces the instantaneous efficiency of heat transfer but may also cause equipment failure due to excessively high local temperatures. Furthermore, in traditional heat exchange structures, the heat exchange paths between the tube-side and shell-side media are relatively short, making it difficult for the two media to fully contact each other. At the same time, the heat exchange tube layout is mostly in single series or parallel configurations, which easily leads to uneven distribution of medium flow velocity and excessively high local flow velocities, resulting in insufficient heat exchange. Therefore, a combined marine heat exchanger is proposed.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A combined marine heat exchanger includes two heat exchanger shells. Two fixed disks are fixedly installed near the top and bottom of the inner walls of each heat exchanger shell. A plurality of heat exchange tubes, U-shaped and stacked, are fixedly installed on the heat exchanger shells via the fixed disks. Two partitions are symmetrically fixedly connected below the fixed disk near the bottom of the heat exchanger shell. A piston cylinder is fixedly connected between the two partitions on the inner wall of the heat exchanger shell, penetrating the center of the bottom of the heat exchanger shell. A piston rod is slidably connected between the inner walls of the piston cylinder. A connector is fixedly connected to the bottom end of the piston rod, and a connecting rod is rotatably connected below the connector. The top end of the piston rod extends into the interior of the heat exchanger shell and is fixedly connected to a baffle plate. Two impellers are symmetrically rotatably connected to the top end of the baffle plate. A plurality of through holes are formed above the baffle plate, the number and position of which correspond to the number and position of the heat exchange tubes. The baffle plate is sleeved onto the outer wall of the heat exchange tubes through the through holes.

[0007] As a further description of the above technical solution:

[0008] A tube-side inlet is provided on one side of the bottom of the heat exchanger shell, and the tube-side inlet is connected to one end of the heat exchange tube. A tube-side outlet is provided on the other side of the bottom of the heat exchanger shell, and the tube-side outlet is connected to the other end of the heat exchange tube. The tube-side outlet of one heat exchanger shell is connected to the tube-side inlet of the other heat exchanger shell.

[0009] As a further description of the above technical solution:

[0010] A shell-side inlet is provided on one side of the top of the heat exchanger shell, and a shell-side outlet is provided on the other side of the top of the heat exchanger shell. The shell-side outlet of one heat exchanger shell is connected to the shell-side inlet of the other heat exchanger shell.

[0011] As a further description of the above technical solution:

[0012] The bottom of the heat exchanger housing is fixedly connected to a support bracket. There are two support brackets, and two support plates are fixedly connected between the two support brackets. An installation bracket is fixedly connected above the two support plates.

[0013] As a further description of the above technical solution:

[0014] A drive rod is rotatably connected to the bottom center of the mounting bracket. The drive rod has an inclined design. A control motor is fixedly installed at the bottom of the mounting bracket. The output end of the control motor is connected to one end of the drive rod.

[0015] As a further description of the above technical solution:

[0016] The top of the mounting bracket is rotatably connected to a swing bracket, and the two ends of the swing bracket are respectively rotatably connected to the end of the connecting rod away from the connecting member.

[0017] As a further description of the above technical solution:

[0018] Two sets of fixing plates are symmetrically fixedly connected between the inner walls of the swing bracket. Each set of fixing plates consists of two plates, and a support column is fixedly connected between the two fixing plates in the same set.

[0019] As a further description of the above technical solution:

[0020] The end of the drive rod is rotatably connected to a connecting bracket, which is U-shaped. Both ends of the connecting bracket are respectively sleeved on the outer walls of the two pillars and rotatably connected to the two pillars.

[0021] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: 1. In this invention, by setting a piston rod, a baffle plate, and an impeller, the piston rod slides up and down inside the piston cylinder, driving the baffle plate at its top to move synchronously back and forth along the outer wall of the heat exchange tube. During the movement of the baffle plate, it interacts with the shell-side medium, and at the same time drives the impeller at the top to rotate synchronously under the impact of the medium. This forms a coordinated action of the piston rod driving the baffle plate to move back and forth and the impeller rotating and disturbing, which can enhance the flow disturbance intensity of the shell-side medium, break the stability of the medium flow, avoid the appearance of medium stagnation areas on the outer wall of the heat exchange tube, improve the instantaneous efficiency of heat transfer, and ensure the stability of the heat exchange performance of the equipment. 2. In this invention, two heat exchanger shells form independent heat exchange cavities through the heat exchanger shells and heat exchange tubes. The tube-side medium flows sequentially through the heat exchange tubes inside the two heat exchanger shells via the series-connected tube inlet and tube outlet. The shell-side medium flows synchronously through the inner cavity of the two heat exchanger shells via the series-connected shell inlet and shell outlet. The heat exchange tubes inside the two heat exchanger shells form a parallel heat exchange structure, which extends the overall heat exchange path of the tube-side and shell-side mediums, allowing the two media to fully contact and exchange heat, thus improving the heat exchange effect. At the same time, the parallel heat exchange tube structure can make the medium form a more uniform flow velocity distribution during the flow process, avoiding insufficient heat exchange caused by excessively fast local flow velocity, further ensuring the stability of heat exchange efficiency, and achieving optimization of heat exchange path extension and heat exchange effect improvement. 3. In this invention, by setting up a drive rod, a connecting bracket, and a swing bracket, the motor controls the rotation of the drive rod. The end of the drive rod drives the connecting bracket to swing back and forth around the support column as the axis. The swing driving force of the connecting bracket is transmitted to the swing bracket, causing the swing bracket to swing back and forth around the top of the mounting bracket as the axis. Then, the power is transmitted to the piston rod through the connecting rods at both ends of the swing bracket, realizing the linear motion of the piston rod. There is no need to add additional complex transmission conversion components, which reduces the complexity of the mechanical structure, improves the operational stability and service life of the transmission system, and ensures the accuracy and continuity of the spoiler movement. Attached Figure Description

[0022] Figure 1 This is a three-dimensional structural diagram of a combined marine heat exchanger proposed in this invention.

[0023] Figure 2 This is a schematic diagram of the cross-sectional structure of the heat exchanger shell of a combined marine heat exchanger proposed in this invention.

[0024] Figure 3 This is a schematic diagram of the connection structure between the heat exchanger shell and the heat exchange tube of a combined marine heat exchanger proposed in this invention.

[0025] Figure 4 This is a schematic diagram of the connection structure between the swing bracket and the connecting rod of a combined marine heat exchanger proposed in this invention;

[0026] Figure 5 This is a schematic diagram of the connection structure between the piston rod and the spoiler of a combined marine heat exchanger proposed in this invention;

[0027] Figure 6 This is a schematic diagram of the connection structure between the drive rod and the connecting bracket of a combined marine heat exchanger proposed in this invention.

[0028] Legend:

[0029] 1. Heat exchanger shell; 2. Fixed plate; 3. Heat exchange tube; 4. Baffle plate; 5. Piston cylinder; 6. Piston rod; 7. Connecting piece; 8. Connecting rod; 9. Baffle plate; 10. Impeller; 11. Through hole; 12. Tube side inlet; 13. Tube side outlet; 14. Shell side inlet; 15. Shell side outlet; 16. Support bracket; 17. Support plate; 18. Mounting bracket; 19. Drive rod; 20. Control motor; 21. Swing bracket; 22. Fixed plate; 23. Support column; 24. Connecting bracket. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] In its specific implementation, such as Figures 1-6 The present invention provides a technical solution:

[0032] A combined marine heat exchanger includes two heat exchanger shells 1. The presence of two heat exchanger shells 1 allows for segmented flow of the tube-side and shell-side media. The tube-side media flows sequentially through the heat exchange tubes 3 of both heat exchanger shells 1, while the shell-side media flows sequentially through the inner cavities of both heat exchanger shells 1. This extends the heat exchange path and time, improving overall heat exchange efficiency. A tube-side inlet 12 is located on one side of the bottom of each heat exchanger shell 1, connected to one end of the heat exchange tube 3. A tube-side outlet 13 is located on the other side of the bottom of each heat exchanger shell 1, connected to the other end of the heat exchange tube 3. The tube-side outlet 13 of one heat exchanger shell 1 is connected to the tube-side inlet 12 of the other heat exchanger shell 1. The tube-side of the two heat exchanger shells 1 is connected in series via the tube-side inlet 12 and tube-side outlet 13, allowing the tube-side media to flow from one heat exchanger shell 1 to the other. The heat exchanger medium flows smoothly into the tube-side inlet 12 of the heat exchanger shell 1, passes through the heat exchange tubes 3, and flows out from the tube-side outlet 13, directly entering another heat exchanger shell 1, forming a complete tube-side flow loop. This extends the flow path of the tube-side medium, allowing it more time for heat exchange. A shell-side inlet 14 is located on one side of the top of the heat exchanger shell 1, and a shell-side outlet 15 is located on the other side. The shell-side outlet 15 of one heat exchanger shell 1 is connected to the shell-side inlet 14 of the other heat exchanger shell 1. The shell-side medium of the two heat exchanger shells is connected in series via the shell-side inlet 14 and the shell-side outlet 15. The shell-side medium can smoothly enter the inner cavity from the shell-side inlet 14 of one heat exchanger shell 1, and after completing the turbulent heat exchange, it flows out from the shell-side outlet 15 and enters another heat exchanger shell 1, forming a complete shell-side flow loop. This extends the heat exchange path of the shell-side medium and further improves the overall heat exchange effect.

[0033] Two fixing plates 2 are fixedly installed on the inner wall of the heat exchanger shell 1 near its top and bottom, respectively. Several heat exchange tubes 3 are fixedly installed on the heat exchanger shell 1 via the fixing plates 2. The fixing plates 2 can stably limit the two ends of the heat exchange tubes 3, preventing displacement of the heat exchange tubes 3 when the medium flows through them and causes impact or vibration during equipment operation, thus ensuring the stability and reliability of the heat exchange tube installation. The heat exchange tubes 3 are U-shaped and stacked, which increases the number of heat exchange tubes 3 and the heat exchange surface area within the limited space of the heat exchanger shell 1. The heat exchanger housing 1 is designed to facilitate more efficient heat exchange between the tube-side and shell-side media. Two baffles 4 are symmetrically fixed below the fixed plate 2 near the bottom of the heat exchanger housing 1. The baffles 4 protect the area surrounding the piston cylinder 5, preventing leakage of the tube-side media into the mating area between the piston cylinder 5 and the piston rod 6. The piston cylinder 5 is fixedly connected to the inner wall of the heat exchanger housing 1 between the two baffles 4. The piston cylinder 5 penetrates the center of the bottom of the heat exchanger housing 1. A piston rod 6 is slidably connected between the inner walls of the piston cylinder 5, providing a dedicated sliding channel for the piston rod 6. The piston rod 6 is precisely guided in its sliding direction, while isolating the shell-side medium from the external transmission structure to prevent leakage. A connecting piece 7 is fixedly connected to the bottom end of the piston rod 6, and a connecting rod 8 is rotatably connected below the connecting piece 7. Through the cooperation between the connecting rod 8 and the connecting piece 7, the connecting rod 8 swings below the connecting piece 7 to transmit power to the piston rod 6, converting the swinging motion into the linear reciprocating motion of the piston rod 6. This ensures smooth and stable power transmission, allowing the baffle 9 to reciprocate smoothly. The top end of the piston rod 6 extends to the heat exchanger housing 1. An internal baffle 9 is fixedly connected to the top of the heat exchange tube 3. Two impellers 10 are symmetrically rotatably connected to the top of the baffle 9. Through the cooperation between the baffle 9 and the impellers 10, when the baffle 9 moves up and down, the impellers 10 rotate synchronously under the impact of the medium, which can form multi-dimensional disturbances on the shell-side medium, break the laminar flow state of the medium, and improve the contact uniformity between the medium and the outer wall of the heat exchange tube 3. Several through holes 11 are opened above the baffle 9. The number and position of the through holes 11 correspond to the number and position of the heat exchange tubes 3. The baffle 9 is sleeved on the outer wall of the heat exchange tube 3 through the through holes 11.

[0034] Two support brackets 16 are fixedly connected to the bottom of the heat exchanger housing 1. Two support plates 17 are fixedly connected between the two support brackets 16. A mounting bracket 18 is fixedly connected above the two support plates 17. A drive rod 19 is rotatably connected to the bottom center of the mounting bracket 18. The drive rod 19 has an inclined design. A control motor 20 is fixedly mounted at the bottom of the mounting bracket 18. The output end of the control motor 20 is connected to one end of the drive rod 19. Because of the drive rod 19, the control motor 20 can provide stable power output. The inclined design of the drive rod 19... This design converts the power of the control motor 20 into the reciprocating swing motion of the subsequent connecting bracket 24, eliminating the need for a complex transmission conversion structure and reducing energy loss during power transmission. A swing bracket 21 is rotatably connected to the top of the mounting bracket 18. Both ends of the swing bracket 21 are rotatably connected to the ends of the connecting rods 8 furthest from the connecting member 7. Through the cooperation of the swing bracket 21 and the connecting rods 8, the swing bracket 21 can synchronously transmit its own reciprocating swing power to the connecting rods 8 at both ends. Through the lever-type transmission action of the swing bracket 21, the two connecting rods 8 move in opposite directions, thereby driving the two... The piston rods 6 inside the heat exchanger housing 1 move up and down alternately, so that when one piston rod 6 is in the upper position, the other piston rod 6 is in the lower position. This alternating motion allows the baffles 9 inside the two heat exchanger housings 1 to create a reverse disturbance effect, making the disturbance of the shell-side medium more intense and uniform, further improving the overall heat exchange efficiency of the heat exchanger. Two sets of fixed plates 22 are symmetrically fixedly connected between the inner walls of the swing bracket 21. Each set of fixed plates 22 has two plates, and a support column 23 is fixedly connected between the two fixed plates 22 in the same set. The end of the drive rod 19 The system is rotatably connected to a connecting bracket 24, which is U-shaped. Both ends of the connecting bracket 24 are respectively sleeved on the outer walls of the two support pillars 23 and rotatably connected to them. Through the rotatable engagement of the connecting bracket 24 and the support pillars 23, the U-shaped structure can simultaneously form a stable connection with both support pillars 23, smoothly converting the rotational power of the drive rod 19 into the reciprocating oscillating power of the swing bracket 21. The dual rotatable engagement of the connecting bracket 24 with the drive rod 19 and the support pillars 23 reduces frictional resistance during transmission, prevents jamming, and ensures smooth operation of the entire transmission system.

[0035] Working Principle: During the heat exchange process, tube-side medium is first introduced into the tube-side inlet 12 of one of the heat exchanger shells 1. Under pressure, the tube-side medium continuously flows through the U-shaped heat exchange tubes 3 inside the heat exchanger shell 1, completing the tube-side flow in the first heat exchanger shell 1. Then, it flows steadily out from the tube-side outlet 13 of the first heat exchanger shell 1 and directly into the tube-side inlet 12 of the other heat exchanger shell 1. Under pressure, it continues to flow through the stacked U-shaped heat exchange tubes 3 inside the second heat exchanger shell 1, ultimately completing the complete tube-side flow process. Simultaneously, shell-side medium is introduced into the corresponding shell-side inlet 14 of the heat exchanger shell 1. After the medium enters the inner cavity of the heat exchanger shell 1, it begins to diffuse and flow within the inner cavity of the heat exchanger shell 1. During the flow of the shell-side medium, the baffle 9 and impeller 10 will have a significant disturbance effect, allowing the shell-side medium to more fully cover the inner cavity space of the heat exchanger shell 1. Then, the shell-side medium flows out from the shell-side outlet 15 of the heat exchanger shell 1 and then enters the shell-side inlet 14 of another heat exchanger shell 1. After flowing through the inner cavity of the second heat exchanger shell 1, the overall flow on the shell side is completed. During the entire process of the tube-side medium and the shell-side medium completing their respective flow, heat is transferred and exchanged between the tube-side medium and the shell-side medium through the tube wall of the heat exchange tube 3.

[0036] During the continuous flow and heat exchange between the tube-side and shell-side media, the control motor 20 is activated. The output of the control motor 20 drives the connected drive rod 19 to rotate. Because the drive rod 19 has an inclined design, its rotation generates a continuous driving force on the U-shaped connecting bracket 24 connected to its end, causing the U-shaped connecting bracket 24 to reciprocate around the two pillars 23. This reciprocating oscillation directly acts on the swing bracket 21, driving it to reciprocate stably around the top of the mounting bracket 18. When the frame 21 reciprocates, its two ends simultaneously undergo reciprocating displacement changes, which in turn transmit driving force to the corresponding connecting parts 7 through the connecting rods 8 connected at both ends. During this power transmission process, the connecting rods 8 rotate at the ends of the swing support 21 and also rotate below the connecting parts 7. Through the interaction of these two rotations, the swing of the swing support 21 is converted into a power that can drive the connecting parts 7 to move, so that the two connecting parts 7 respectively drive the corresponding piston rods 6 to slide stably up and down inside the piston cylinder 5. The inner wall of the piston cylinder 5 and the piston rods 6 The tight fit provides precise and stable guidance for the up-and-down sliding of the piston rod 6. As the piston rod 6 slides up and down continuously within the piston cylinder 5, the baffle 9 at the top of the piston rod 6 also moves up and down synchronously. During the up-and-down movement of the baffle 9 along the outer wall of the heat exchange tube 3, the shell-side medium continuously contacts and interacts with the surface of the baffle 9 and the impeller 10 located at the top of the baffle 9. Under the impact of the medium's flow and the up-and-down movement of the baffle 9, the impeller 10 rotates accordingly. The rotation of the impeller 10 further... The original flow state of the shell-side medium is disrupted, forming local eddies and turbulent flow. The up-and-down reciprocating motion of the baffle 9 will cause the surrounding shell-side medium to flow in the up-and-down direction. The rotation of the impeller 10 and the up-and-down reciprocating motion of the baffle 9 work together to continuously change the flow trajectory and flow velocity of the shell-side medium in the inner cavity of the heat exchanger shell 1. This continuously creates an all-round, multi-dimensional disturbance effect on the shell-side medium in the heat exchanger shell 1, allowing the shell-side medium to be more evenly distributed in the inner cavity of the heat exchanger shell 1 and to fully contact the outer wall of the heat exchange tube 3.

Claims

1. A combined marine heat exchanger, characterized in that, include: A heat exchanger housing (1) is provided, comprising two housings. Two fixed disks (2) are fixedly installed on the inner walls of each housing (1) near their top and bottom, respectively. Several heat exchange tubes (3) are fixedly installed on each housing (1) via the fixed disks (2). The heat exchange tubes (3) are U-shaped and stacked. Two partitions (4) are symmetrically fixed below the fixed disks (2) near the bottom of the housing (1). A piston cylinder (5) is fixedly connected between the two partitions (4) on the inner wall of the housing (1). The piston cylinder (5) penetrates the center of the bottom of the housing (1). A piston rod (6) is slidably connected between the inner walls of the piston cylinder (5). A connector (7) is fixedly connected to the bottom end of the piston rod (6). A connecting rod (8) is rotatably connected to the bottom of the connector (7). The top end of the piston rod (6) extends into the heat exchanger housing (1) and a baffle plate (9) is fixedly connected to the top end. Two impellers (10) are symmetrically rotatably connected to the top end of the baffle plate (9). Several through holes (11) are opened above the baffle plate (9). The number and position of the several through holes (11) correspond to the number and position of several heat exchange tubes (3). The baffle plate (9) is sleeved on the outer wall of the heat exchange tube (3) through the through holes (11).

2. The combined marine heat exchanger according to claim 1, characterized in that, A tube-side inlet (12) is provided on one side of the bottom of the heat exchanger housing (1), and the tube-side inlet (12) is connected to one end of the heat exchange tube (3). A tube-side outlet (13) is provided on the other side of the bottom of the heat exchanger housing (1), and the tube-side outlet (13) is connected to the other end of the heat exchange tube (3). The tube-side outlet (13) in one heat exchanger housing (1) is connected to the tube-side inlet (12) of the other heat exchanger housing (1).

3. A combined marine heat exchanger according to claim 1, characterized in that, A shell-side inlet (14) is provided on one side of the top of the heat exchanger housing (1), and a shell-side outlet (15) is provided on the other side of the top of the heat exchanger housing (1). The shell-side outlet (15) of one heat exchanger housing (1) is connected to the shell-side inlet (14) of the other heat exchanger housing (1).

4. A combined marine heat exchanger according to claim 1, characterized in that, The bottom of the heat exchanger housing (1) is fixedly connected to a support bracket (16), and there are two support brackets (16). Two support plates (17) are fixedly connected between the two support brackets (16), and an installation bracket (18) is fixedly connected above the two support plates (17).

5. A combined marine heat exchanger according to claim 4, characterized in that, A drive rod (19) is rotatably connected to the bottom center of the mounting bracket (18). The drive rod (19) is designed to be inclined. A control motor (20) is fixedly installed at the bottom of the mounting bracket (18). The output end of the control motor (20) is connected to one end of the drive rod (19).

6. A combined marine heat exchanger according to claim 5, characterized in that, The top of the mounting bracket (18) is rotatably connected to a swing bracket (21), and the two ends of the swing bracket (21) are respectively rotatably connected to the end of the connecting rod (8) away from the connecting member (7).

7. A combined marine heat exchanger according to claim 6, characterized in that, Two sets of fixing plates (22) are symmetrically fixedly connected between the inner walls of the swing bracket (21). There are two fixing plates (22) in each set, and a support column (23) is fixedly connected between the two fixing plates (22) in the same set.

8. A combined marine heat exchanger according to claim 7, characterized in that, The end of the drive rod (19) is rotatably connected to a connecting bracket (24). The connecting bracket (24) is U-shaped. The two ends of the connecting bracket (24) are respectively sleeved on the outer walls of the two pillars (23) and rotatably connected to the two pillars (23).

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