Shell and tube heat exchanger

Abstract

The present application relates to the technical field of heat exchangers, and in particular to a shell and tube heat exchanger, comprising a shell, both ends of the shell are detachably connected with end covers, a plurality of medium pipes are detachably connected between the two end covers, a plurality of plug holes are evenly provided on the end covers, one end of each medium pipe is inserted into one of the plug holes, a plugging component is provided in each of the plug holes, the plugging component is used to plug the plug hole, and when the medium pipe is inserted into the plug hole, the plugging component opens the plug hole. The present application has the effect of facilitating the adjustment of the number of medium pipes.

Description

Technical Field

[0001] The present application relates to the technical field of heat exchangers, and in particular to a shell and tube heat exchanger. Background Art

[0002] At present, shell and tube heat exchangers, also known as shell and tube heat exchangers, are wall-type heat exchangers that use the wall surface of the tube bundle enclosed in the shell as the heat transfer surface. This type of heat exchanger has a simple structure, low cost, wide flow cross-section, and is easy to clean scale. In related technologies, medium pipes are usually set in shell and tube heat exchangers to facilitate the transportation of medium used for heat exchange.

[0003] Regarding the above-mentioned related technologies: the number of medium tubes in the produced shell and tube heat exchangers is usually fixed, so that the performance of the shell and tube heat exchanger is certain, which may easily lead to an excessive number of medium tubes, resulting in excess performance, and easily lead to increased costs for subsequent cleaning and replacement of the medium tubes, and thus there is a problem that the number of medium tubes cannot be adjusted according to demand. Summary of the invention

[0004] In order to facilitate adjustment of the number of medium tubes, the present application provides a shell and tube heat exchanger.

[0005] The present application provides a shell and tube heat exchanger, which adopts the following technical solution:

[0006] A shell and tube heat exchanger comprises a shell, both ends of the shell are detachably connected with end covers, a plurality of medium pipes are detachably connected between the two end covers, a plurality of plug holes are evenly provided on the end covers, one end of each medium pipe is inserted into one of the plug holes, a plugging component is provided in each of the plug holes, the plugging component is used to plug the plug hole, and when the medium pipe is inserted into the plug hole, the plugging component opens the plug hole.

[0007] By adopting the above technical solution, when the medium pipe is inserted into the plug-in hole, the plugging component opens the plug-in hole, so that the medium can flow into the plug-in hole through the medium pipe and flow out of the plug-in hole, and when the medium pipe is removed from the end cover, the plugging component can block the plug-in hole to prevent the medium from flowing out of the plug-in hole, thereby facilitating the installation or disassembly of the medium pipe, so as to adjust the number of medium pipes according to needs, so that the performance of the shell and tube heat exchanger can be maximized, which is conducive to avoiding the problem of surplus performance and reducing the cost of later cleaning and replacement of the medium pipe.

[0008] Optionally, the sealing assembly includes a fixing ring, a sealing plate and a first driving member, the fixing ring is arranged on a side of the plug-in hole away from the medium tube, the sealing plate is slidably arranged in the plug-in hole, the diameter of the sealing plate is smaller than the diameter of the plug-in hole, the first driving member is connected to the sealing plate, the first driving member is used to drive the sealing plate to move until it contacts the fixing ring, and the medium tube is detachably connected to a second driving member, and when the medium tube is inserted in the plug-in hole, the second driving member can drive the sealing plate away from the fixing ring.

[0009] By adopting the above technical solution, when the medium pipe is separated from the plug hole, the first driving member can drive the blocking plate to move in the direction close to the fixing ring, so that the blocking plate contacts the fixing ring, thereby facilitating the plug hole to be blocked by the blocking plate, so as to reduce the possibility of the medium flowing out of the plug hole. And when the medium pipe is inserted into the plug hole, the second driving member can drive the blocking plate to move in the direction away from the fixing ring, so that the blocking plate is separated from the fixing ring, and the blocking plate no longer blocks the plug hole, so that the medium flows into the plug hole through the medium pipe and flows out of the plug hole.

[0010] Optionally, the first driving member includes a first magnet, which is arranged on the sealing plate and is used to adsorb the fixing ring; the second driving member includes a second magnet, which is detachably connected to the medium tube and is used to adsorb the sealing plate.

[0011] By adopting the above technical solution, when the medium tube is inserted into the plug hole, the second magnet adsorbs the blocking plate, and the suction force generated by the second magnet on the blocking plate is greater than the suction force generated by the first magnet on the fixed ring, so that the second magnet drives the blocking plate to move away from the fixed ring, so that the blocking plate no longer blocks the plug hole. When the medium tube is out of the plug hole, the second magnet no longer applies suction to the blocking plate, and the first magnet applies suction to the fixed ring to drive the blocking plate to move toward the fixed ring, so that the blocking plate and the fixed ring collide with each other, so that the plug hole is blocked by the blocking plate.

[0012] Optionally, a flow guide is provided on a side of the sealing plate facing away from the fixing ring, and the flow guide is used to guide the medium to the peripheral side of the sealing plate.

[0013] By adopting the above-mentioned technical solution, the guide member can guide the medium to the peripheral side of the sealing plate, so that when the medium flows in the plug-in hole, it is not easy to push the sealing plate to move toward the direction close to the fixed ring, thereby facilitating the use of the second magnet to stably adsorb the sealing plate, thereby reducing the possibility of the sealing plate blocking the plug-in hole due to the pressure exerted by the medium.

[0014] Optionally, a connecting sleeve is provided on the second magnet, and the connecting sleeve is sleeved on the medium pipe and fits tightly with the medium pipe.

[0015] By adopting the above technical solution, the connecting sleeve is arranged on the medium tube, which makes it easy to connect and fix the second magnet to the medium tube on the one hand, and makes it easy for the medium tube to drive the second magnet to move on the other hand, so as to reduce the possibility of the second magnet remaining in the plug hole when the medium tube is detached from the plug hole.

[0016] Optionally, a shielding sleeve is coaxially arranged in the plug hole, and the blocking plate is slidably arranged in the shielding sleeve.

[0017] By adopting the above technical solution and setting the shielding sleeve, the possibility of the magnetic field generated by the first magnet and the second magnet affecting the surrounding equipment is reduced to a certain extent.

[0018] Optionally, a limit ring is coaxially arranged in the plug-in hole, the limit ring is arranged opposite to the fixing ring, and a support foot is arranged on the side of the sealing plate facing away from the fixing ring. When the second driving member drives the sealing plate away from the fixing ring, the support foot contacts the limit ring.

[0019] By adopting the above technical solution, when the blocking plate is separated from the fixing ring, the support leg can contact the limiting ring, so that the blocking plate no longer moves away from the fixing ring, thereby facilitating the blocking plate to be restricted in the plug hole, so as to reduce the possibility of the blocking plate being separated from the plug hole. At this time, the medium can flow out of the plug hole through the gap between the blocking plate and the plug hole.

[0020] Optionally, a guide groove is provided on the inner wall of the plug hole, and a protrusion is provided on the support foot, and the protrusion is slidably inserted in the guide groove.

[0021] By adopting the above technical solution, when the sealing plate moves, the sealing plate can drive the protrusion to move through the support feet, so that the protrusion moves in the guide groove, and the inner wall of the guide groove guides the protrusion, so that the protrusion drives the sealing plate to rotate around the axis of the plug-in hole through the support feet, thereby facilitating friction between the sealing plate and the inner wall of the plug-in hole and the fixing ring, and to a certain extent removing the scale on the sealing plate, the fixing ring and the inner wall of the plug-in hole, thereby facilitating the sealing plate to stably seal the plug-in hole.

[0022] Optionally, a sealing head is provided on a side of the end cover away from the shell, a liquid flow cavity is formed between the sealing head and the end cover, the plug hole is communicated with the liquid flow cavity, a partition is horizontally provided inside one of the two liquid flow cavities, the partition is used to separate the liquid flow cavity into a first chamber and a second chamber, the sealing head is respectively provided with a first pipe and a second pipe, the first pipe is communicated with the first chamber, and the second pipe is communicated with the second chamber;

[0023] A plurality of baffles are arranged in the shell, and the baffles are divided into two upper and lower rows and arranged in sequence at intervals. A plurality of supporting holes are opened on the baffles, and a medium pipe is inserted in one of the supporting holes. The shell is connected with a third pipe and a fourth pipe.

[0024] By adopting the above technical solution, the hot fluid medium can flow into the shell through the third pipe, and flow out from the fourth pipe after passing through a number of baffles. The cold fluid medium can flow into the first chamber through the first pipe, and flow into the second chamber through the medium pipe, the liquid flow chamber and the medium pipe in sequence, and finally flow out from the second pipe, thereby facilitating the heat exchange between the cold fluid medium and the hot fluid medium.

[0025] Optionally, a plurality of friction grooves are arranged in the support hole along the axial direction thereof, and the friction grooves are used to limit the rotation of the medium pipe.

[0026] By adopting the above technical solution, the friction pattern is arranged along the axis of the support hole, so that the medium tube can be smoothly inserted into the support hole, and when the medium tube is inserted into the support hole, the friction pattern can provide resistance for the medium tube to reduce the possibility of the medium tube rotating in the support hole, thereby helping to improve the stability of the medium tube.

[0027] In summary, the present application includes at least one of the following beneficial technical effects:

[0028] 1. Through the cooperation between the end cover and the plugging assembly, when the medium pipe is inserted into the plug hole, the medium can flow out of the plug hole, and when the medium pipe is separated from the plug hole, the plugging assembly can block the plug hole, so that the medium is not easy to flow out of the plug hole, thereby facilitating the installation or removal of the medium pipe, so as to adjust the number of medium pipes according to needs, so that the performance of the shell and tube heat exchanger can be maximized, thereby helping to avoid the problem of excess performance and reducing the cost of cleaning and replacing the medium pipe in the later stage;

[0029] 2. Through the cooperation of the fixing ring, the blocking plate, the first magnet and the second magnet, when the medium tube is inserted into the plug hole, the second magnet can adsorb the blocking plate to drive the blocking plate to move away from the fixing ring, so that the blocking plate no longer blocks the plug hole, and when the medium tube is out of the plug hole, the second magnet no longer applies suction to the blocking plate, and the first magnet applies suction to the fixing ring to drive the blocking plate to move in the direction close to the fixing ring, so that the blocking plate is in conflict with the fixing ring, so that the plug hole is blocked by the blocking plate;

[0030] 3. Through the mutual cooperation of the end cover, the support foot and the protrusion, when the sealing plate moves, the sealing plate can drive the protrusion to move in the guide groove through the support foot, and the inner wall of the guide groove can guide the protrusion, so that the protrusion drives the sealing plate to rotate around the axis of the plug-in hole through the support foot, thereby facilitating the friction between the sealing plate and the inner wall of the plug-in hole and the fixing ring, and to a certain extent removing the scale on the sealing plate, the fixing ring and the inner wall of the plug-in hole, thereby facilitating the sealing plate to stably block the plug-in hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the overall structure of a shell and tube heat exchanger in Example 1 of the present application.

[0032] Figure 2 It is a schematic structural diagram of the shell and tube heat exchanger without a shell and a head in Example 1 of the present application.

[0033] Figure 3 It is a side view of a shell and tube heat exchanger in Example 1 of the present application.

[0034] Figure 4 is along Figure 3 Section view along line AA.

[0035] Figure 5 yes Figure 4 A partial enlarged view of point B in the middle.

[0036] Figure 6 It is a schematic diagram of the structure of the sealing plate, the first magnet and the supporting feet in Example 1 of the present application.

[0037] Figure 7 It is a schematic diagram of the internal structure of a plug hole on the end cover in Example 1 of the present application.

[0038] Figure 8 It is a schematic diagram of the structure of the baffle in Example 1 of the present application.

[0039] Fig. 9 It is a schematic diagram of the structure of the sealing plate, the first magnet and the supporting feet in Example 2 of the present application.

[0040] Description of reference numerals:

[0041] 1. Shell; 11. Third pipeline; 12. Fourth pipeline; 13. Baffle; 131. Support hole; 132. Friction pattern; 2. End cover; 21. Plug hole; 22. Blocking assembly; 221. Fixing ring; 222. Blocking plate; 2221. Guide member; 223. First magnet; 224. Support foot; 2241. Protrusion; 23. Shielding sleeve; 24. Limiting ring; 25. Guide groove; 3. Medium pipe; 31. Second driving member; 311. Second magnet; 312. Connecting sleeve; 4. End cover; 41. Liquid flow chamber; 411. First chamber; 412. Second chamber; 42. Partition; 43. First pipeline; 44. Second pipeline. DETAILED DESCRIPTION

[0042] The following is combined with Figure 1-9 This application is described in further detail.

[0043] The embodiment of the present application discloses a shell and tube heat exchanger.

[0044] It should be noted that, in the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicating orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0045] Example 1

[0046] Reference Figure 1 and Figure 2 A shell and tube heat exchanger includes a hollow shell 1, and end covers 2 are detachably connected to both ends of the shell 1. A plurality of medium pipes 3 are detachably connected between the two end covers 2. The medium pipes 3 are used for medium transmission and heat exchange. A plurality of plug holes 21 are evenly opened on the end cover 2, and one end of a medium pipe 3 is plugged into a plug hole 21. A plugging component 22 is provided in each plug hole 21.

[0047] Reference Figure 3 and Figure 4 When the medium tube 3 is detached from the plug hole 21, the plugging component 22 can block the plug hole 21 to prevent leakage of the medium, and when the medium tube 3 is inserted into the plug hole 21, the plugging component 22 opens the plug hole 21 to facilitate medium transmission.

[0048] Reference Figure 4 and Figure 5, a shielding sleeve 23 and a limiting ring 24 are coaxially arranged in the plug hole 21. The plugging assembly 22 includes a fixing ring 221, a blocking plate 222 and a first driving member. The fixing ring 221 is installed on the side of the plug hole 21 away from the medium pipe 3, and the limiting ring 24 is arranged opposite to the fixing ring 221. In this embodiment, the fixing ring 221 is made of magnetic material.

[0049] The inner diameter of the fixing ring 221 is smaller than the inner diameter of the shielding sleeve 23, the blocking plate 222 is slidably disposed in the shielding sleeve 23 and is located between the fixing ring 221 and the limiting ring 24, and the circumferential side wall of the blocking plate 222 is spaced from the inner wall of the shielding sleeve 23. In other embodiments, the shielding sleeve 23 may not be provided, and the blocking plate 222 may be directly slidably inserted in the plug hole 21.

[0050] Reference Figure 5 and Figure 6 The first driving member includes a first magnet 223, which is embedded in the blocking plate 222 and located on a side of the blocking plate 222 close to the fixing ring 221. The first magnet 223 can adsorb the fixing ring 221 to drive the blocking plate 222 to move, so that the blocking plate 222 contacts the fixing ring 221, thereby facilitating the use of the blocking plate 222 to block the plug hole 21. In other embodiments, the first driving member can also be configured as a spring.

[0051] Reference Figure 5 A support leg 224 is fixedly connected to the side of the blocking plate 222 away from the fixing ring 221. A plurality of support legs 224 are provided, and the plurality of support legs 224 are evenly distributed on the blocking plate 222. When the blocking plate 222 moves in a direction away from the fixing ring 221, the support leg 224 can contact the limiting ring 24, so that the blocking plate 222 no longer moves in a direction away from the fixing ring 221, thereby facilitating limiting the moving distance of the blocking plate 222, so as to reduce the possibility of the blocking plate 222 being separated from the plug hole 21. In this embodiment, the support leg 224 is made of magnetic material.

[0052] Reference Figure 5 , the medium pipe 3 is detachably connected with a second driving member 31, and the second driving member 31 includes a second magnet 311 and a connecting sleeve 312. The second magnet 311 is fixedly connected to the connecting sleeve 312, and the connecting sleeve 312 is sleeved on the medium pipe 3 and fits tightly with the medium pipe 3, so as to facilitate the connection and fixation of the second magnet 311 and the medium pipe 3. In other embodiments, the second magnet 311 and the medium pipe 3 can also be connected and fixed by threaded connection, bonding or welding.

[0053] When the medium tube 3 is inserted into the plug hole 21, the second magnet 311 is also inserted into the plug hole 21. At this time, the second magnet 311 can adsorb the support leg 224, and the suction force generated by the second magnet 311 on the support leg 224 is greater than the suction force generated by the first magnet 223 on the fixed ring 221, so that the support leg 224 drives the blocking plate 222 to move toward the limit ring 24, so that the blocking plate 222 is separated from the fixed ring 221, and the support leg 224 is in conflict with the limit ring 24. At this time, the blocking plate 222 no longer blocks the plug hole 21, so that the medium flows into the plug hole 21 through the medium tube 3 and flows out of the plug hole 21.

[0054] It should be noted that the second magnet 311 is connected and fixed to the medium tube 3 using the connecting sleeve 312, so that when the medium tube 3 drives the second magnet 311 to disengage from the plug hole 21, the second magnet 311 is not easily separated from the medium tube 3, which helps to reduce the possibility of the second magnet 311 remaining in the plug hole 21.

[0055] Reference Figure 5 and Figure 7 A guide groove 25 is provided on the inner wall of the plug hole 21, and the guide groove 25 passes through the shielding sleeve 23. The number of the guide grooves 25 is equal to the number of the legs 224. The legs 224 are fixedly connected with a protrusion 2241, which is slidably inserted in the guide groove 25 and fits with the inner wall of the guide groove 25.

[0056] When the sealing plate 222 moves, the sealing plate 222 can drive the protrusion 2241 to move through the support foot 224, so that the protrusion 2241 moves in the guide groove 25, and the inner wall of the guide groove 25 guides the protrusion 2241, so that the protrusion 2241 drives the sealing plate 222 to rotate around the axis of the plug-in hole 21 through the support foot 224, thereby facilitating the friction between the sealing plate 222 and the inner wall of the plug-in hole 21 and the fixing ring 221, and to a certain extent removes the scale on the sealing plate 222, the fixing ring 221 and the inner wall of the plug-in hole 21, thereby facilitating the sealing plate 222 to stably block the plug-in hole 21.

[0057] Reference Figure 4 The end cover 2 is detachably connected to a head 4 on one side away from the shell 1. In this embodiment, the head 4 and the end cover 2 are connected by bolts, so that the head 4 and the end cover 2 can be disassembled.

[0058] A liquid flow cavity 41 is formed between the end cap 4 and the end cover 2, and the plug hole 21 is connected to the liquid flow cavity 41. A partition 42 is horizontally installed inside one of the two liquid flow cavities 41, and the partition 42 is used to separate the liquid flow cavity 41 into a first chamber 411 and a second chamber 412, and the first chamber 411 is not directly connected to the second chamber 412.

[0059] The first pipe 43 and the second pipe 44 are respectively installed on the head 4. The first pipe 43 is connected to the first chamber 411, and the second pipe 44 is connected to the second chamber 412, so that the fluid medium can flow from the first pipe 43 into the first chamber 411, and then pass through the plug hole 21, the medium pipe 3, the liquid flow chamber 41 and the medium pipe 3 into the second chamber 412 in sequence, and finally flow out from the second pipe 44.

[0060] The shell 1 is connected with a third pipe 11 and a fourth pipe 12, so that the fluid medium can flow into the shell 1 through the third pipe 11 and flow out from the fourth pipe 12. When the shell and tube heat exchanger is working, the hot fluid medium can flow through the third pipe 11, the shell 1 and the fourth pipe 12 in sequence, and the cold fluid medium can flow through the first pipe 43, the first chamber 411, the medium pipe 3, the liquid flow chamber 41, the medium pipe 3, the second chamber 412 and the second pipe 44 in sequence, so as to facilitate the heat exchange between the cold fluid medium and the hot fluid medium.

[0061] Reference Figure 2 and Figure 4 A plurality of baffles 13 are installed in the housing 1. The baffles 13 are divided into two rows, one above the other, and are arranged in sequence. A plurality of support holes 131 are provided on each baffle 13. A medium pipe 3 is inserted into a support hole 131, so that the baffle 13 is used to support the medium pipe 3 to improve the stability of the medium pipe 3. The arrangement of the baffles 13 can extend the fluid path, so that the fluid medium stays in the heat exchanger for a longer time, so as to improve the heat exchange efficiency.

[0062] Reference Figure 8 A plurality of friction grooves 132 are arranged in the support hole 131 along its own axial direction, so that the medium tube 3 can be smoothly inserted into the support hole 131, and when the medium tube 3 is inserted into the support hole 131, the friction grooves 132 can provide resistance for the medium tube 3 to reduce the possibility of the medium tube 3 rotating in the support hole 131, thereby further improving the stability of the medium tube 3.

[0063] The implementation principle of a shell and tube heat exchanger in an embodiment of the present application is as follows: when the number of medium tubes 3 needs to be increased, first remove one end cover 2 from the shell 1, and then insert the medium tube 3 into the plug hole 21 on the other end cover 2, so that the second magnet 311 fits with the limit ring 24. At this time, the second magnet 311 generates suction on the support leg 224, so that the support leg 224 moves to contact the limit ring 24, and the support leg 224 drives the blocking plate 222 to move, so that the blocking plate 222 is separated from the fixing ring 221. Next, reconnect the removed end cover 2 to the shell 1, and insert the other end of the medium tube 3 into the plug hole 21 to fix the medium tube 3. Finally, connect the head 4 to the end cover 2 to complete the assembly of the shell and tube heat exchanger. At this time, the medium can flow from the first pipe 43 into the first chamber 411 , and sequentially pass through the plug hole 21 , the medium pipe 3 , the liquid flow chamber 41 and the medium pipe 3 into the second chamber 412 , and finally flow out from the second pipe 44 .

[0064] When the number of medium tubes 3 needs to be reduced, the medium tubes 3 are removed from the plug hole 21, so that the second magnet 311 no longer generates suction force on the legs 224, so that the first magnet 223 can absorb the fixing ring 221, and the first magnet 223 drives the blocking plate 222 to move to contact the fixing ring 221, so as to achieve the blocking of the plug hole 21. At this time, the medium can no longer flow out of the plug hole 21.

[0065] In the embodiment of the present application, through the mutual cooperation of the fixing ring 221, the sealing plate 222, the support foot 224, the limit ring 24, the first magnet 223 and the second magnet 311, the number of medium tubes 3 can be flexibly increased or decreased, so that the number of medium tubes 3 can be adjusted according to demand, so that the performance of the shell and tube heat exchanger can be maximized, which is beneficial to avoid the problem of surplus performance and reduce the cost of later cleaning and replacement of the medium tubes 3.

[0066] Example 2

[0067] Reference Figure 5 and Fig. 9 , a flow guide 2221 is integrally formed on one side of the blocking plate 222 away from the fixing ring 221. In this embodiment, the flow guide 2221 is hemispherical, so that the flow guide 2221 can guide the medium to the peripheral side of the blocking plate 222, so that the medium is not easy to push the blocking plate 222 to move when flowing in the plug hole 21, which is conducive to reducing the possibility of the blocking plate 222 moving due to the pressure exerted by the medium, and further conducive to the blocking plate 222 stably blocking or opening the plug hole 21.

[0068] In other embodiments, a flow guide 2221 may also be provided on a side of the blocking plate 222 close to the fixing ring 221 to further prevent the medium from pushing the blocking plate 222 to move.

[0069] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A shell and tube heat exchanger, characterized in that: The invention comprises a shell (1), wherein both ends of the shell (1) are detachably connected to end covers (2), a plurality of medium tubes (3) are detachably connected between the two end covers (2), a plurality of plug holes (21) are evenly provided on the end cover (2), one end of a medium tube (3) is inserted into a plug hole (21), a plugging component (22) is provided in each plug hole (21), the plugging component (22) is used to plug the plug hole (21), and when the medium tube (3) is inserted into the plug hole (21), the plugging component (22) opens the plug hole (21); The blocking assembly (22) comprises a fixing ring (221), a blocking plate (222) and a first driving member, wherein the fixing ring (221) is arranged on a side of the plug hole (21) away from the medium pipe (3), the blocking plate (222) is slidably arranged in the plug hole (21), the diameter of the blocking plate (222) is smaller than the diameter of the plug hole (21), the first driving member is connected to the blocking plate (222), and the first driving member is used to drive the blocking plate (222) to move to contact the fixing ring (221), and the medium pipe (3) is detachably connected to the second driving member (31), and when the medium pipe (3) is inserted in the plug hole (21), the second driving member (31) can drive the blocking plate (222) away from the fixing ring (221); The first driving member comprises a first magnet (223), the first magnet (223) is arranged on the sealing plate (222), and the first magnet (223) is used to adsorb the fixing ring (221); the second driving member (31) comprises a second magnet (311), the second magnet (311) is detachably connected to the medium pipe (3), and the second magnet (311) is used to adsorb the sealing plate (222).

2. The shell and tube heat exchanger according to claim 1, characterized in that: A flow guide (2221) is provided on the side of the sealing plate (222) facing away from the fixing ring (221), and the flow guide (2221) is used to guide the medium to the peripheral side of the sealing plate (222).

3. The shell and tube heat exchanger according to claim 1, characterized in that: The second magnet (311) is provided with a connecting sleeve (312), and the connecting sleeve (312) is sleeved on the medium pipe (3) and is tightly fitted with the medium pipe (3).

4. The shell and tube heat exchanger according to claim 1, characterized in that: A shielding sleeve (23) is coaxially arranged in the plug hole (21), and the blocking plate (222) is slidably arranged in the shielding sleeve (23).

5. The shell and tube heat exchanger according to claim 1, characterized in that: A limit ring (24) is coaxially arranged in the plug hole (21), the limit ring (24) being arranged opposite to the fixing ring (221), a support foot (224) being arranged on a side of the blocking plate (222) facing away from the fixing ring (221), and when the second driving member (31) drives the blocking plate (222) away from the fixing ring (221), the support foot (224) contacts the limit ring (24).

6. The shell and tube heat exchanger according to claim 5, characterized in that: A guide groove (25) is provided on the inner wall of the plug hole (21), and a protrusion (2241) is provided on the support foot (224), and the protrusion (2241) is slidably inserted in the guide groove (25).

7. The shell and tube heat exchanger according to claim 1, characterized in that: A sealing head (4) is provided on a side of the end cover (2) away from the shell (1), a liquid flow chamber (41) is formed between the sealing head (4) and the end cover (2), the plug hole (21) is in communication with the liquid flow chamber (41), a partition (42) is horizontally provided inside one of the two liquid flow chambers (41), the partition (42) is used to separate the liquid flow chamber (41) into a first chamber (411) and a second chamber (412), a first pipe (43) and a second pipe (44) are respectively provided on the sealing head (4), the first pipe (43) is in communication with the first chamber (411), and the second pipe (44) is in communication with the second chamber (412); A plurality of baffles (13) are arranged in the shell (1), the baffles (13) are divided into two upper and lower rows and are arranged in sequence at intervals, a plurality of support holes (131) are opened on the baffles (13), one of the medium pipes (3) is inserted into one of the support holes (131), and the shell (1) is connected to a third pipe (11) and a fourth pipe (12).

8. The shell and tube heat exchanger according to claim 7, characterized in that: A plurality of friction patterns (132) are arranged in the support hole (131) along its own axial direction, and the friction patterns (132) are used to limit the rotation of the medium pipe (3).

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