Up-down serial shell-and-tube heat exchanger

Abstract

The utility model relates to the technical field of shell-and-tube heat exchangers, in particular to an up-and-down series shell-and-tube heat exchanger which comprises an upper heat exchange tube, two fixing plates are fixed to the lower surface of the upper heat exchange tube, and a heat exchange mechanism used for heat exchange of media is arranged at the lower ends of the fixing plates. The heat exchange mechanism comprises a lower heat exchange pipe, the lower heat exchange pipe is fixed to the lower end of the fixing plate, protective shells are fixed to one end of the lower heat exchange pipe and one end of the upper heat exchange pipe correspondingly, heat conduction pipes are installed in the lower heat exchange pipe and the upper heat exchange pipe correspondingly, and one ends of the two heat conduction pipes communicate with connecting pipes correspondingly. And the tail end of one heat conduction pipe is communicated with a cold medium inlet pipe. Through the arranged heat exchange mechanism, the heat exchange effect can be achieved, the heat exchange medium in the heat conduction pipe can enter the other heat exchanger through the connecting pipe to conduct heat exchange again, then the heat exchange time of the hot medium and the cold medium is prolonged, and the heat exchange efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of shell-and-tube heat exchanger technology, and in particular to a shell-and-tube heat exchanger connected in series. Background Technology

[0002] The working principle of a shell-and-tube heat exchanger is based on the fundamental principles of heat conduction and fluid dynamics. It mainly consists of an outer shell, an internal tube bundle, and a tube sheet. The heat source fluid flows through the tubes in the tube bundle, and is called the tube-side fluid; while the cooling source fluid flows in the annular space between the shell and the tubes, and is called the shell-side fluid. When the two fluids pass through the tube side and shell side respectively, due to the temperature difference between them, heat is transferred from the hotter fluid to the cooler fluid. As heat is transferred, the temperature of the tube-side fluid gradually decreases, while the temperature of the shell-side fluid gradually increases, thus achieving the purpose of heat exchange.

[0003] When the shell-side medium of the existing heat exchanger flows to the other side of the baffle through uniform through holes, the flow velocity of the shell-side medium on both sides of the baffle is the same, resulting in less disturbance to the shell-side medium on that side and less impact on heat exchange.

[0004] An existing patent (publication number: CN221685262U) discloses a shell-and-tube heat exchanger, which includes a shell, a tube sheet, heat exchange tubes, and baffles. The shell has a shell-side medium inlet for the medium to flow in and a shell-side medium outlet for the medium to flow out. The tube sheet has a tube sheet inlet end and a tube sheet outlet end, which are connected to the shell and form a cavity. The heat exchange tubes include a tube-side medium inlet for the medium to flow in and a tube-side medium outlet for the medium to flow out. The tube-side medium inlet is connected to the tube sheet inlet end, and the tube-side medium outlet is connected to the tube sheet outlet end. When the shell-side medium flows through the transition orifice in the shell, the flow velocity of the shell-side medium increases. The shell-side medium flowing out from the second end of the transition orifice disturbs the flow dead zone, thereby reducing the flow dead zone in the shell and enhancing the heat exchange effect.

[0005] To address the aforementioned issues, while existing patents offer solutions that allow for adjustment of the nozzle position to increase the spray range, the heat exchange tubes and shells of their shell-and-tube heat exchangers are relatively short, reducing the heat exchange time between the hot and cold media and thus lowering the heat exchange efficiency. Summary of the Invention

[0006] The purpose of this invention is to provide a shell-and-tube heat exchanger connected in series, which can achieve heat exchange effect, and the heat exchange medium in the heat-conducting tube can enter another heat exchanger through the connecting pipe for further heat exchange, thereby increasing the heat exchange time between the hot and cold media and improving the heat exchange efficiency, so as to solve the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: an upper and lower series shell-and-tube heat exchanger, including an upper heat exchange tube, two fixing plates fixed on the lower surface of the upper heat exchange tube, and a heat exchange mechanism for heat exchange of the medium provided at the lower end of the fixing plates;

[0008] The heat exchange mechanism includes a lower heat exchange tube, which is fixed to the lower end of a fixed plate. One end of both the lower and upper heat exchange tubes is fixed with a protective shell. Both the lower and upper heat exchange tubes are equipped with heat-conducting pipes. One end of each heat-conducting pipe is connected to a connecting pipe. The end of one heat-conducting pipe is connected to a cold medium inlet pipe, and the end of the other heat-conducting pipe is connected to a cold medium outlet pipe. Both protective shells are equipped with cleaning mechanisms for cleaning the heat exchange mechanism.

[0009] Preferably, a heat medium inlet pipe is connected to the upper surface of one of the protective shells, and a heat medium outlet pipe connected to the protective shell is provided on the right side of the heat medium inlet pipe.

[0010] Preferably, the inner walls of both the upper and lower heat exchange tubes are fixed with heat-insulating inner shells, and the lower end of the upper heat exchange tube is connected to a connecting pipe that communicates with the lower heat exchange tube.

[0011] Preferably, the lower surface of the lower heat exchange tube is fixed with two support legs.

[0012] Preferably, the cleaning mechanism includes two water wheels, both of which are housed inside the protective casing.

[0013] Preferably, both water turbines are rotatably connected to a fixed frame via bearings. One end of the fixed frame is fixed with two first cleaning brushes, and one side of the fixed frame is symmetrically fixed with two second cleaning brushes that are in close contact with the inner wall of the upper heat exchange tube.

[0014] Preferably, one end of each of the two waterwheels is fixed with a fixing pipe, and the outer surface of each fixing pipe is fitted with a fixing bearing embedded in the inner wall of the protective shell.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] 1. Through the heat exchange mechanism, heat exchange effect can be achieved, and the heat exchange medium in the heat pipe can enter another heat exchanger through the connecting pipe for further heat exchange, thereby increasing the heat exchange time between the hot medium and the cold medium and improving the heat exchange efficiency.

[0017] 2. The cleaning mechanism can drive the water wheel to rotate, which in turn drives the fixed frame to rotate. This drives the first and second cleaning brushes to move and clean the inner wall of the upper heat exchange tube and the outer wall of the heat conduction tube, reducing impurities adhering to the surface and improving the heat exchange effect. The fixed tube, with the cooperation of the fixed bearing, can ensure the stability of the water wheel during rotation. Attached Figure Description

[0018] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 This is an overall structural view of the present invention;

[0020] Figure 2 This is a half-sectional structural diagram of the heat exchange tube of this utility model;

[0021] Figure 3 This is a half-sectional structural diagram of the protective shell of this utility model;

[0022] Figure 4 This is a three-dimensional structural diagram of the water turbine of this utility model.

[0023] Explanation of reference numerals in the attached figures:

[0024] 1. Upper heat exchanger tube; 2. Fixing plate; 3. Lower heat exchanger tube; 31. Protective shell; 32. Heat conduction tube; 33. Connecting pipe; 34. Cold medium inlet pipe; 35. Cold medium outlet pipe; 4. Hot medium inlet pipe; 5. Hot medium outlet pipe; 6. Insulated inner shell; 7. Connecting pipe; 8. Support leg; 9. Water wheel; 91. Fixing frame; 92. First cleaning brush; 93. Second cleaning brush; 94. Fixing pipe; 95. Fixing bearing. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0026] This utility model provides a technical solution:

[0027] Please see Figures 1 to 4A shell-and-tube heat exchanger connected in series includes an upper heat exchange tube 1, two fixing plates 2 are fixed on the lower surface of the upper heat exchange tube 1, and a heat exchange mechanism for heat exchange of the medium is provided at the lower end of the fixing plate 2.

[0028] The heat exchange mechanism includes a lower heat exchange tube 3, which is fixed to the lower end of the fixed plate 2. One end of both the lower heat exchange tube 3 and the upper heat exchange tube 1 is fixed with a protective shell 31. Both the lower heat exchange tube 3 and the upper heat exchange tube 1 are equipped with heat-conducting tubes 32. One end of each heat-conducting tube 32 is connected to a connecting pipe 33. The end of one heat-conducting tube 32 is connected to a cold medium inlet pipe 34, and the end of the other heat-conducting tube 32 is connected to a cold medium outlet pipe 35. Both protective shells 31 are equipped with cleaning mechanisms for cleaning the heat exchange mechanism. The upper surface of one protective shell 31 is connected to a heat medium inlet pipe 4. The right side of the heat medium inlet pipe 4 is equipped with a heat medium outlet pipe 5 that communicates with the protective shell 31. The inner walls of both the upper heat exchange tube 1 and the lower heat exchange tube 3 are fixed with heat-insulating inner shells 6. The lower end of the upper heat exchange tube 1 is connected to a connecting pipe 7 that communicates with the lower heat exchange tube 3. Two support legs 8 are fixed to the lower surface of the lower heat exchange tube 3.

[0029] By adopting the above technical solution, before using the upper and lower series shell-and-tube heat exchanger, the upper heat exchange tube 1 and the lower heat exchange tube 3 are first installed in a suitable position. The fixed plate 2 can ensure the stability of the upper heat exchange tube 1 and the lower heat exchange tube 3. The supporting leg 8 plays a supporting role. The external hot medium pipe and the hot medium inlet pipe 4 are connected, and then the heat exchange medium pipe and the cold medium inlet pipe 34 are connected, so that the hot medium enters into the upper heat exchange tube 1. Through the connecting pipe 7, it can flow back into the lower heat exchange tube 3. The heat exchange medium enters the heat conduction pipe 32, so that the hot medium heats the heat exchange medium and achieves the heat exchange effect. The heat exchange medium in the heat conduction pipe 32 can enter another heat exchanger through the connecting pipe 33 for heat exchange again, thereby increasing the heat exchange time between the hot medium and the cold medium and improving the heat exchange efficiency. The heat exchanged medium is discharged through the hot medium outlet pipe 5, while the heat-carrying heat exchange medium is discharged through the cold medium outlet pipe 35 for collection. The heat-insulating inner shell 6 can play a heat preservation role.

[0030] Specifically, such as Figure 1 , Figure 3 and Figure 4 As shown, the cleaning mechanism includes two water wheels 9, both of which are housed inside the protective shell 31. The interior of each water wheel 9 is rotatably connected to a fixed frame 91 via bearings. Two first cleaning brushes 92 are fixed to one end of the fixed frame 91, and two second cleaning brushes 93 that fit tightly against the inner wall of the upper heat exchange tube 1 are symmetrically fixed to one side of the fixed frame 91. A fixed tube 94 is fixed to one end of each water wheel 9, and a fixed bearing 95 embedded in the inner wall of the protective shell 31 is fitted onto the outer surface of the fixed tube 94.

[0031] By adopting the above technical solution, when the heat medium passes through the inside of the protective shell 31, it will drive the water wheel 9 to rotate, which in turn drives the fixed frame 91 to rotate. This will drive the first cleaning brush 92 and the second cleaning brush 93 to move, clean the inner wall of the upper heat exchange tube 1 and the outer wall of the heat conduction tube 32, reduce the impurities adhering to the surface, and improve the heat exchange effect. The fixed pipe 94, with the cooperation of the fixed bearing 95, can ensure the stability of the water wheel 9 when it rotates.

[0032] Working principle: The heat medium enters the upper heat exchange tube 1 and flows back into the lower heat exchange tube 3 through the connecting pipe 7. The heat exchange medium enters the heat conduction pipe 32, where it heats the heat exchange medium to achieve the heat exchange effect. The heat exchange medium in the heat conduction pipe 32 can enter another heat exchanger through the connecting pipe 33 for further heat exchange, thereby increasing the heat exchange time between the heat medium and the cold medium. The heat exchanged medium is discharged through the heat medium outlet pipe 5, while the heat-carrying heat exchange medium is discharged through the cold medium outlet pipe 35 for collection. The heat-insulating inner shell 6 can keep the temperature. When the heat medium passes through the protective shell 31, it will drive the water wheel 9 to rotate, which in turn drives the fixed frame 91 to rotate. This drives the first cleaning brush 92 and the second cleaning brush 93 to move, cleaning the inner wall of the upper heat exchange tube 1 and the outer wall of the heat conduction pipe 32, reducing the impurities adhering to the surface.

[0033] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A shell-and-tube heat exchanger connected in series, comprising an upper heat exchange tube (1), characterized in that: Two fixing plates (2) are fixed on the lower surface of the upper heat exchange tube (1), and the lower end of the fixing plate (2) is provided with a heat exchange mechanism for heat exchange of the medium. The heat exchange mechanism includes a lower heat exchange tube (3), which is fixed to the lower end of the fixed plate (2). One end of the lower heat exchange tube (3) and the upper heat exchange tube (1) are both fixed with a protective shell (31). Both the lower heat exchange tube (3) and the upper heat exchange tube (1) are equipped with heat-conducting tubes (32). One end of each of the two heat-conducting tubes (32) is connected to a connecting pipe (33). The end of one of the heat-conducting tubes (32) is connected to a cold medium inlet pipe (34), and the end of the other heat-conducting tube (32) is connected to a cold medium outlet pipe (35). The interior of each of the two protective shells (31) is equipped with a cleaning mechanism for cleaning the heat exchange mechanism.

2. The shell-and-tube heat exchanger in series according to claim 1, characterized in that: A heat medium inlet pipe (4) is connected to the upper surface of the protective shell (31), and a heat medium outlet pipe (5) connected to the protective shell (31) is provided on the right side of the heat medium inlet pipe (4).

3. The shell-and-tube heat exchanger in series according to claim 1, characterized in that: The inner walls of the upper heat exchange tube (1) and the lower heat exchange tube (3) are both fixed with heat-insulating inner shells (6), and the lower end of the upper heat exchange tube (1) is connected to a connecting pipe (7) that is connected to the lower heat exchange tube (3).

4. A shell-and-tube heat exchanger in series according to claim 3, characterized in that: Two support legs (8) are fixed on the lower surface of the lower heat exchange tube (3).

5. A shell-and-tube heat exchanger in series according to claim 1, characterized in that: The cleaning mechanism includes two water wheels (9), both of which are housed inside the protective shell (31).

6. A shell-and-tube heat exchanger in series according to claim 5, characterized in that: The interior of each of the two water turbines (9) is rotatably connected to a fixed frame (91) via a bearing. One end of the fixed frame (91) is fixed with two first cleaning brushes (92), and one side of the fixed frame (91) is symmetrically fixed with two second cleaning brushes (93) that are in close contact with the inner wall of the upper heat exchange tube (1).

7. A shell-and-tube heat exchanger in series according to claim 6, characterized in that: One end of each of the two water turbines (9) is fixed with a fixed pipe (94), and the outer surface of the fixed pipe (94) is fitted with a fixed bearing (95) embedded in the inner wall of the protective shell (31).

Images