Shell-and-tube heat exchanger with variable number of water-side passes

Abstract

The present invention discloses a shell-and-tube heat exchanger with variable number of water-side processes, including a shell and a working box. At the left end of the top of the shell, two butt joints are fixedly connected. The heat exchange tubes are fixedly installed in the middle of the inner cavity of the shell. The heat exchange tubes are divided into four groups. A first guide plate is fixedly connected to the left end of the inner cavity of the shell, and a second guide plate is fixedly connected to the right end of the inner cavity of the shell. A first plug cover is movably connected to the left side of the shell. During the actual operation and use of this heat exchanger of the present invention, the number of processes of the heat exchange tubes inside the heat exchanger can be adjusted according to the flow rate of the water body. When the water-side flow rate is large, the heat exchange tubes can be adjusted from 4 processes to 2 processes. By increasing the number of heat exchange tubes in each process, the flow velocity and pressure of the water body can be adjusted, effectively avoiding large erosion of the heat exchange tubes due to high water pressure, and improving the overall service life.

Description

Technical Field

[0001] The present invention relates to the technical field of heat exchangers, and particularly to a shell-and-tube heat exchanger with variable number of water-side passes. Background Art

[0002] In recent years, with the rapid development of the commercial water chiller market, the currently developed standard units can no longer meet the non-standard and customized needs of the market. The operating conditions of the original units have changed from the previous single condition to the current multi-conditions, and the inlet and outlet water temperature differences of the evaporator and condenser have changed from the standard 5°C to the current 8°C or even 10°C.

[0003] As one of the core components of commercial water chillers, the heat transfer capacity of the evaporator and condenser directly affects the capacity and energy efficiency of the unit. On the premise that the refrigerating capacity of the unit remains unchanged, if the inlet and outlet water temperature difference increases, the inlet and outlet water flow rates will decrease significantly, which will synchronously lead to a decrease in the water flow velocity inside the heat exchange tubes of the heat exchanger, seriously affecting the heat exchange effect of the heat exchanger; if the inlet and outlet water temperature difference decreases, the water flow rate will increase significantly. Although the heat exchange effect is improved, the water-side pressure loss will increase significantly, affecting the circulation of the air-conditioning water system. At the same time, the high water flow velocity inside the heat exchange tubes will exacerbate the erosion and corrosion of the heat exchange tubes, affecting the service life of the unit. Summary of the Invention

[0004] The purpose of the present invention is to provide a shell-and-tube heat exchanger with variable number of water-side passes, which has the advantages that when the water-side flow rate increases, it can adopt methods such as changing from 4 passes to 2 passes, and by increasing the number of heat exchange tubes in each pass, it can adjust the pressure and flow velocity of the water body inside the heat exchange tubes. Conversely, when the water flow rate decreases, the water flow velocity inside the heat exchange tubes can also be increased through the above reverse operation, effectively improving the heat exchange operation effect, while reducing the impact of water pressure erosion on the heat exchange tubes and improving the overall service life.

[0005] To achieve the above object, the present invention provides the following technical solutions: a shell-and-tube heat exchanger with variable number of water-side processes, including a shell and a working box. At the left end of the top of the shell, there are two butt joints fixed. In the middle of the inner cavity of the shell, there is a heat exchange tube fixed. The heat exchange tube is divided into four groups. At the left end of the inner cavity of the shell, there is a first guide plate fixed. At the right end of the inner cavity of the shell, there is a second guide plate fixed. On the left side of the shell, there is a first plug cover movably connected. In the inner cavity of the first plug cover, there is a first adjustable guide plate fixed. In the middle of the outer surface of the first plug cover, there is a first toothed ring fixed. On the right side of the shell, there is a second plug cover movably connected. In the inner cavity of the second plug cover, there is a second adjustable guide plate fixed. In the middle of the outer surface of the second plug cover, there is a second toothed ring fixed. At the upper left end of the outer surface of the working box, there is a stepping motor fixed. At the output end of the stepping motor, there is a rotating rod fixed. On the right side of the rotating rod, there is a second gear fixed. On the left end of the rotating rod, there is a first synchronous pulley fixed. At the upper left side of the working box, there is a rotating shaft movably connected through a bearing. On the left side of the rotating shaft, there is a first gear fixed. On the right side of the rotating shaft, there is a second synchronous pulley fixed. Between the middle of the second synchronous pulley and the middle of the first synchronous pulley, there is a synchronous belt drivingly connected. The above technical solutions have the following advantages: dynamic adaptability, according to the change of water flow, switch between 4 processes and 2 processes (such as switching to 2 processes at high flow rate to reduce the flow rate per process, lower the flow velocity and pressure, and prevent erosion; switching to 4 processes at low flow rate to increase the flow velocity and improve the heat exchange efficiency). Compatible with multiple working conditions, adapt to different inlet and outlet water temperature differences (such as 5°C, 8°C, 10°C), and expand the application range of the unit. Prolong the service life, reduce the corrosion risk of the heat exchange tube by adjusting the flow velocity and pressure.

[0006] As a preferred solution, at both ends of the outer surface of the shell, there are annular frame plates fixed. On the outer surfaces of the first plug cover and the second plug cover, there are annular sealing frames fixed. The inner cavity of the annular sealing frame is movably connected to the surface of the annular frame plate. The above technical solutions have the following advantages: positioning and sealing, through the cooperation of the frame plate and the sealing frame, ensure the accurate position of the plug cover during rotation and prevent deviation; double sealing (first / second rubber rings) enhances the anti-leakage ability.

[0007] As a preferred solution, on the mutually remote sides of the two annular frame plates, there is a first rubber ring fixed. The surface of the first rubber ring contacts the inner cavity of the annular sealing frame. Between the four circumferences of the inner cavity of the annular sealing frame, there is a second rubber ring fixed. The surface of the second rubber ring contacts the surface of the annular frame plate. The above technical solutions have the following advantages: multiple sealing guarantees, the elastic contact of the rubber rings forms a redundant sealing barrier to further prevent the leakage of high-pressure water flow.

[0008] As a preferred solution, a frame is fixedly connected between the two ends of the outer surface of the housing. The bottom of the outer surface of the working box is fixedly connected to the middle end of the frame. A first support frame is fixedly connected to the left side of the frame. The left end of the first support frame is movably connected to the left end of a rotating shaft through a bearing. A second support frame is fixedly connected to the right side of the frame. The right end of the second support frame is movably connected to the right end of a rotating rod through a bearing. The left end of the rotating rod is movably connected to the upper end of the right side of the working box. The above technical solution has the following advantages: structural stability. The support frames ensure that the transmission components (gears, synchronous pulleys) maintain coaxiality during rotation, avoiding mechanical failures caused by uneven stress.

[0009] As a preferred solution, the first gear meshes with the first toothed ring, and the second gear meshes with the second toothed ring. The above technical solution has the following advantages: precise transmission. The gear set directly drives the plug cover to rotate, ensuring the mechanical reliability of the position adjustment of the deflector.

[0010] As a preferred solution, the transmission ratio of the first gear to the second gear is 1:2, and the first toothed ring and the second toothed ring have the same specifications. The above technical solution has the following advantages: optimized synchronous movement. The rotation angle difference of the plug covers (for example, the left plug cover rotates 45°, and the right plug cover rotates 90°) matches the position of the deflector required for the process switch, realizing the efficient conversion of different process modes.

[0011] As a preferred solution, the transmission ratio of the first synchronous pulley to the second synchronous pulley is 1. The above technical solution has the following advantages: power synchronous distribution. It ensures the synchronous rotation of the rotating shaft and the rotating rod, avoiding the misalignment of the flow channels caused by the asynchronous movement of the left and right plug covers.

[0012] As a preferred solution, a maintenance board is fixedly installed on the front surface of the working box, and the shape of the maintenance board is rectangular. The above technical solution has the following advantages: maintenance convenience. It is convenient to repair internal components such as the stepping motor and gears, reducing the maintenance cost.

[0013] As a preferred solution, a flange is fixedly connected to the top of the butt joint pipe, and mounting holes are provided around the flange. The above technical solution has the following advantages: quick installation. The standardized flange interface simplifies the connection with external pipes and adapts to different pipeline systems.

[0014] As a preferred solution, the right side of the first adjustable deflector contacts the left side of the first deflector, and the left side of the second adjustable deflector contacts the right side of the second deflector. The above technical solution has the following advantages: uniform flow guiding. When the deflectors are closed, a continuous flow channel is formed, avoiding water flow short circuit or turbulence and ensuring uniform heat transfer.

[0015] The beneficial effects of the present invention are as follows: the number of processes can be flexibly adjusted, and the switching between 4 processes and 2 processes is realized through a mechanical adjustment mechanism, solving the problem that fixed-process heat exchangers cannot adapt to flow changes; anti-leakage design, the combination of an annular sealing structure and a rubber ring improves the sealing reliability under high pressure; structural stability, the design of the frame and the support frame ensures the stability of transmission components during long-term operation; heat transfer efficiency optimization, adapting to different flow velocities and process lengths, maximizing the heat exchange efficiency and reducing erosion loss. Specifically as follows:

[0016] During the actual operation and use of the heat exchanger of the present invention, the number of processes of the heat exchange tubes inside the heat exchanger can be adjusted accordingly according to the flow rate of the water body. When the water-side flow rate is large, the heat exchange tubes can be adjusted from 4 processes to 2 processes. By increasing the number of heat exchange tubes in each process, the flow velocity and pressure of the water body can be adjusted, effectively avoiding large erosion of the heat exchange tubes due to high water pressure, improving the overall service life. And when the water-side flow rate is small, by adjusting the heat exchange tubes from 2 processes to 4 processes, the flow velocity of the water in the heat exchange tubes can be effectively increased by reducing the number of heat exchange tubes in each process, and the heat exchange stroke is effectively increased, thus greatly improving the effect of the heat exchange operation.

[0017] By correspondingly adding a first adjusting deflector, a first deflector, a second adjusting deflector and a second deflector between the housing and the first end cap and the second end cap, the present invention can evenly distribute the water flow inside the housing to the heat exchange tubes of each process during the operation of the heat exchanger, effectively avoiding large stratification of the water temperature inside the housing and the heat exchange tubes.

[0018] Through the setting of the annular frame plate and the annular sealing frame, the present invention can effectively limit the positions between the first end cap, the second end cap and the housing, preventing offset and dislocation between the first end cap, the second end cap and the housing. At the same time, through the setting of the first rubber ring and the second rubber ring, the sealing performance of the contact between the annular frame plate and the annular sealing frame is effectively improved, effectively avoiding water leakage during the heat exchange process of water transportation.

[0019] Through the setting of the frame, the purpose of supporting the working box and the housing is achieved. Through the setting of the first support frame and the second support frame, one ends of the rotating shaft and the rotating rod can be effectively supported respectively, preventing the rotating shaft and the rotating rod from tilting due to rotational force. Through the setting of the maintenance plate, it is convenient for personnel to perform maintenance operations on the components inside the working box in the later stage. Through the setting of the flange, it is convenient for personnel to connect and install the docking pipe with the external water supply pipeline. Brief Description of the Drawings

[0020] Figure 1 It is a three-dimensional view of the present invention;

[0021] Figure 2This is a schematic diagram of the cross-sectional structure of the working box of the present invention when viewed from above;

[0022] Figure 3 It is a schematic diagram of the front cross-sectional structure of the housing of the present invention;

[0023] Figure 4 It is a state diagram of the first regulating guide plate and the first guide plate in the process of 4 of the present invention;

[0024] Figure 5 It is a state diagram of the second regulating guide plate and the second guide plate in the process 4 of the present invention;

[0025] Figure 6 It is a state diagram of the first regulating guide plate and the first guide plate in the process 2 of the present invention;

[0026] Figure 7 This is a state diagram of the second regulating guide plate and the second guide plate during process 2 of the present invention.

[0027] In the figure: 1. shell; 2. working box; 3. frame; 4. maintenance plate; 5. first plugging cover; 6. first gear ring; 7. annular sealing frame; 8. docking tube; 9. second gear ring; 10. second plugging cover; 11. first gear; 12. first support frame; 13. rotating shaft; 14. stepping motor; 15. first synchronous wheel; 16. rotating rod; 17. second gear; 18. second support frame; 19. synchronous belt; 20. second synchronous wheel; 21. first guide plate; 22. second guide plate; 23. first regulating guide plate; 24. heat exchange tube; 25. second regulating guide plate; 26. annular frame plate; 27. first rubber ring; 28. second rubber ring. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments. Example

[0030] See also Figures 1-7As shown, the present invention provides a water-side variable flow rate shell and tube heat exchanger, comprising a shell 1 and a working box 2, the left end of the top of the shell 1 is fixedly connected with a butt-joint pipe 8, the number of the butt-joint pipes 8 is two, the middle end of the inner cavity of the shell 1 is fixedly installed with a heat exchange tube 24, the heat exchange tube 24 is divided into four groups, the left end of the inner cavity of the shell 1 is fixedly connected with a first guide plate 21, the right end of the inner cavity of the shell 1 is fixedly connected with a second guide plate 22, the left side of the shell 1 is movably connected with a first plugging cover 5, the inner cavity of the first plugging cover 5 is fixedly connected with a first regulating guide plate 23, the middle end of the outer surface of the first plugging cover 5 is fixedly installed with a first gear ring 6, the right side of the shell 1 is movably connected with a second plugging cover 10, the second plugging cover 10 The inner cavity is fixedly connected with a second regulating guide plate 25, the middle end of the outer surface of the second blocking cover 10 is fixedly installed with a second gear ring 9, the upper end of the left side of the outer surface of the working box 2 is fixedly installed with a stepping motor 14, the output end of the stepping motor 14 is fixedly installed with a rotating rod 16, the right side of the rotating rod 16 is fixedly installed with a second gear 17, the left end of the rotating rod 16 is fixedly installed with a first synchronous wheel 15, the upper end of the left side of the working box 2 is movably connected with a rotating shaft 13 through a bearing, the left side of the rotating shaft 13 is fixedly installed with a first gear 11, the right side of the rotating shaft 13 is fixedly installed with a second synchronous wheel 20, and the middle end of the second synchronous wheel 20 is connected to the middle end of the first synchronous wheel 15 with a synchronous belt 19.

[0031] In the present technical solution, during the actual operation and use of the heat exchanger, the number of processes of the heat exchange tube 24 inside the heat exchanger can be adjusted according to the flow rate of the water body. When the flow rate on the water side is large, the heat exchange tube 24 can be adjusted from 4 processes to 2 processes. By increasing the number of heat exchange tubes 24 in each process to adjust the flow rate and pressure of the water body, it is effectively avoided that the heat exchange tube 24 is eroded due to the high water pressure, thereby improving the overall service life. When the flow rate on the water side is small, by adjusting the heat exchange tube 24 from 2 processes to 4 processes, the number of heat exchange tubes 24 in each process is reduced, and the water flow rate in the heat exchange tube 24 is effectively improved, and the heat exchange stroke is effectively increased, thereby greatly improving the effect of the heat exchange operation. Example

[0032] Based on the first embodiment, the present invention is as follows Figure 1 and Figure 3 As shown, both ends of the outer surface of the shell 1 are fixedly connected with annular frame plates 26, the outer surfaces of the first blocking cover 5 and the outer surfaces of the second blocking cover 10 are fixedly connected with annular sealing frames 7, the inner cavity of the annular sealing frame 7 is movably connected to the surface of the annular frame plate 26, and a first rubber ring 27 is fixedly installed on the side of the two annular frame plates 26 away from each other, and the surface of the first rubber ring 27 contacts the inner cavity of the annular sealing frame 7, and a second rubber ring 28 is fixedly installed around the inner cavity of the annular sealing frame 7, and the surface of the second rubber ring 28 contacts the surface of the annular frame plate 26.

[0033] In this technical solution, through the arrangement of the annular frame plate 26 and the annular sealing frame 7, effective limiting can be carried out between the first plug cover 5, the second plug cover 10 and the housing 1, avoiding offset and dislocation between the first plug cover 5, the second plug cover 10 and the housing 1. At the same time, through the arrangement of the first rubber ring 27 and the second rubber ring 28, the sealing performance of the contact between the annular frame plate 26 and the annular sealing frame 7 is effectively improved, effectively avoiding water leakage during the process of water transportation and heat exchange. Embodiment

[0034] On the basis of Embodiment 1, as shown in the present invention Figures 1-7 There is a fixed connection between both ends of the outer surface of the housing 1 and a frame body 3. The bottom of the outer surface of the working box 2 is fixedly connected to the middle end of the frame body 3. A first support frame 12 is fixedly connected to the left side of the frame body 3. The left end of the first support frame 12 is movably connected to the left end of a rotating shaft 13 through a bearing. A second support frame 18 is fixedly connected to the right side of the frame body 3. The right end of the second support frame 18 is movably connected to the right end of a rotating rod 16 through a bearing. The left end of the rotating rod 16 is movably connected to the upper end of the right side of the working box 2 through a bearing. A first gear 11 meshes with a first toothed ring 6. A second gear 17 meshes with a second toothed ring 9. The transmission ratio of the first gear 11 to the second gear 17 is 1:2. The first toothed ring 6 and the second toothed ring 9 have the same specifications. The transmission ratio of the first synchronous pulley 15 to the second synchronous pulley 20 is 1. A maintenance plate 4 is fixedly installed on the front surface of the working box 2. The shape of the maintenance plate 4 is rectangular. A flange is fixedly connected to the top of the butt joint pipe 8, and installation holes are provided around the flange. The right side of the first adjusting deflector 23 contacts the left side of the first deflector 21. The left side of the second adjusting deflector 25 contacts the right side of the second deflector 22.

[0035] In this technical solution, through the arrangement of the frame body 3, the purpose of supporting the working box 2 and the housing 1 is achieved. Through the arrangement of the first support frame 12 and the second support frame 18, one end of the rotating shaft 13 and the rotating rod 16 can be effectively supported respectively, avoiding the inclination of the rotating shaft 13 and the rotating rod 16 due to rotational force. Through the arrangement of the maintenance plate 4, it is convenient for personnel to carry out maintenance operations on the components inside the working box 2 in the later stage. Through the arrangement of the flange, it is convenient for personnel to dock and install the butt joint pipe 8 with the external water pipeline.

[0036] The working principle of the present invention is as follows: Since the initial state of this heat exchanger is a 4 - flow process, when the water supply flow rate is large and it is necessary to adjust this heat exchanger to a 2 - flow process, the external PLC controller starts the stepping motor 14 to work, driving the rotating rod 16, the second gear 17, and the first synchronous wheel 15 to rotate. The rotation of the first synchronous wheel 15 can drive the second synchronous wheel 20, the rotating shaft 13, and the first gear 11 to rotate through the synchronous belt 19. Under the action of the rotation of the first gear 11 and the second gear 17, the first toothed ring 6, the first plug 5, the first adjustable guide plate 23, the second toothed ring 9, the second plug 10, and the second adjustable guide plate 25 can be driven to rotate respectively until the first adjustable guide plate 23 can rotate 45 degrees clockwise and the second adjustable guide plate 25 can rotate 90 degrees. Under the cooperation of the first adjustable guide plate 23, the first guide plate 21, the second adjustable guide plate 25, and the second guide plate 22, the four groups of heat exchange tubes 24 inside the housing 1 can be divided into two front - and - rear connected areas. When the external water supply pipeline supplies water into the housing 1 through the front - located docking pipe 8, the water flow can flow to the right along the two groups of heat exchange tubes 24 located in the front inside the housing 1, and then flow to the left along the inside of the two groups of heat exchange tubes 24 located in the rear inside the housing 1, and be discharged to the outside through the rear - located docking pipe 8. And when the water supply flow rate is small and it is necessary to adjust this heat exchanger to a 4 - flow process, the external PLC controller starts the stepping motor 14 to work in the other direction, driving the rotating rod 16, the second gear 17, and the first synchronous wheel 15 to rotate. The rotation of the first synchronous wheel 15 can drive the second synchronous wheel 20, the rotating shaft 13, and the first gear 11 to rotate through the synchronous belt 19. Under the action of the rotation of the first gear 11 and the second gear 17, the first toothed ring 6, the first plug 5, the first adjustable guide plate 23, the second toothed ring 9, the second plug 10, and the second adjustable guide plate 25 can be driven to rotate respectively until the first adjustable guide plate 23 can rotate 45 degrees counterclockwise and the second adjustable guide plate 25 can rotate 90 degrees. Under the cooperation of the first adjustable guide plate 23, the first guide plate 21, the second adjustable guide plate 25, and the second guide plate 22, the four groups of heat exchange tubes 24 inside the housing 1 can be divided into four sequentially connected areas. When the external water supply pipeline supplies water into the housing 1 through the front - located docking pipe 8, the water can sequentially pass through the heat exchange tubes 24 located in the front on the upper layer of the housing 1 (the water flow direction is from left to right), the heat exchange tubes 24 located in the front on the lower layer of the housing 1 (the water flow direction is from right to left), the heat exchange tubes 24 located in the rear on the lower layer of the housing 1 (the water flow direction is from left to right), the heat exchange tubes 24 located in the rear on the upper layer of the housing 1 (the water flow direction is from right to left), and the rear - located docking pipe 8 and be discharged to the outside.

[0037] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than limiting the protection scope of the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. Shell-and-tube heat exchanger with variable number of water-side processes, comprising a shell (1) and a working box (2), characterized in that: At the left end of the top of the housing (1), a docking pipe (8) is fixedly connected. The number of the docking pipes (8) is two. In the middle of the inner cavity of the housing (1), a heat exchange pipe (24) is fixedly installed. The heat exchange pipe (24) is divided into four groups. At the left end of the inner cavity of the housing (1), a first guide plate (21) is fixedly connected. At the right end of the inner cavity of the housing (1), a second guide plate (22) is fixedly connected. The left side of the housing (1) is movably connected with a first plug cover (5). Inside the first plug cover (5), a first adjustable guide plate (23) is fixedly connected. In the middle of the outer surface of the first plug cover (5), a first gear ring (6) is fixedly installed. The right side of the housing (1) is movably connected with a second plug cover (10). Inside the second plug cover (10), a second adjustable guide plate (25) is fixedly connected. In the middle of the outer surface of the second plug cover (10), a second gear ring (9) is fixedly installed. At the upper left end of the outer surface of the working box (2), a stepping motor (14) is fixedly installed. At the output end of the stepping motor (14), a rotating rod (16) is fixedly installed. On the right side of the rotating rod (16), a second gear (17) is fixedly installed. On the left end of the rotating rod (16), a first synchronous pulley (15) is fixedly installed. At the upper left end of the working box (2), a rotating shaft (13) is movably connected through a bearing. On the left side of the rotating shaft (13), a first gear (11) is fixedly installed. On the right side of the rotating shaft (13), a second synchronous pulley (20) is fixedly installed. Between the middle of the second synchronous pulley (20) and the middle of the first synchronous pulley (15), a synchronous belt (19) is drivingly connected; At both ends of the outer surface of the housing (1), an annular frame plate (26) is fixedly connected. On the outer surfaces of the first plug cover (5) and the second plug cover (10), an annular sealing frame (7) is fixedly connected. The inner cavity of the annular sealing frame (7) is movably connected to the surface of the annular frame plate (26); On the mutually remote sides of the two annular frame plates (26), a first rubber ring (27) is fixedly installed. The surface of the first rubber ring (27) contacts the inner cavity of the annular sealing frame (7). Between the four circumferences of the inner cavity of the annular sealing frame (7), a second rubber ring (28) is fixedly installed. The surface of the second rubber ring (28) contacts the surface of the annular frame plate (26); The first gear (11) meshes with the first gear ring (6), and the second gear (17) meshes with the second gear ring (9); The transmission ratio of the first gear (11) to the second gear (17) is 1:2, and the first gear ring (6) and the second gear ring (9) have the same specifications; The transmission ratio of the first synchronous pulley (15) to the second synchronous pulley (20) is 1; The right side of the first adjustable guide plate (23) contacts the left side of the first guide plate (21), and the left side of the second adjustable guide plate (25) contacts the right side of the second guide plate (22).

2. The shell-and-tube heat exchanger with variable number of water-side processes according to claim 1, wherein: A frame body (3) is fixedly connected between two ends of the outer surface of the housing (1). The bottom of the outer surface of the working box (2) is fixedly connected to the middle end of the frame body (3). A first support frame (12) is fixedly connected to the left side of the frame body (3). The left end of the first support frame (12) is movably connected to the left end of a rotating shaft (13) through a bearing. A second support frame (18) is fixedly connected to the right side of the frame body (3). The right end of the second support frame (18) is movably connected to the right end of a rotating rod (16) through a bearing. The left end of the rotating rod (16) is movably connected to the upper end of the right side of the working box (2) through a bearing.

3. The shell-and-tube heat exchanger with variable number of water-side processes according to claim 1, characterized in that: A maintenance plate (4) is fixedly installed on the front surface of the working box (2). The maintenance plate (4) is rectangular in shape.

4. The variable water-side pass number shell-and-tube heat exchanger according to claim 1, characterized in that: A flange is fixedly connected to the top of the docking pipe (8), and mounting holes are formed in the circumferences of the flange.

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