Double-pipe heat exchanger

Abstract

The invention discloses a double-pipe heat exchanger, and relates to the technical field of heat exchangers. The heat exchanger comprises the outer pipe and the inner pipe, the inner pipe is arranged in the outer pipe and is of a spiral structure, the retention time of a second medium in the inner pipe is prolonged, the heat exchange effect is ensured, the left end and the right end of the inner pipe are connected with the fluid outlet and the fluid inlet correspondingly, and the through hole is formed in the right surface of the outer pipe and matched with the fluid inlet. A sealing ring is arranged between the fluid inlet and the inner wall of the through hole, a cover plate is arranged on the outer surface of the fluid outlet and is matched with a left port of the outer pipe, a sealing plug is adhered to the inner surface of the cover plate and is matched with the inner wall of the outer pipe, and the sealing performance between the outer pipe and the inner pipe is ensured; meanwhile, an outlet is formed in the right side of the lower surface of the outer pipe, a plurality of buffer plates are hinged to the inner wall of the outlet, and buffer springs are connected between the buffer plates and the inner wall of the outlet, so that the retention time of the first medium in the outer pipe is prolonged, and the heat exchange effect is effectively improved.

Description

Technical Field

[0001] This invention belongs to the field of heat exchanger technology, and in particular relates to a shell-and-tube heat exchanger. Background Technology

[0002] Shell-and-tube heat exchangers typically consist of multiple concentric tubes of different layers, through which different heat exchange media are circulated. Heat transfer occurs through the temperature difference between the heat exchange media. Their structure is mostly shell-and-tube, and they have the advantages of simple structure, flexible increase or decrease in heat transfer area, high heat transfer efficiency, wide operating range, and being composed of standard components, requiring no additional processing during installation and being easy to install. Therefore, they are widely used in industrial production sectors such as petrochemicals.

[0003] Currently, existing shell-and-tube heat exchangers are difficult to maintain, clean, and disassemble. They also have poor sealing at detachable connections, which can easily lead to leaks during use. Furthermore, they cannot increase the heat exchange time of the internal medium during the heat exchange process, thus affecting the heat exchange effect.

[0004] To address this issue, we designed a shell-and-tube heat exchanger. Summary of the Invention

[0005] To solve the above-mentioned technical problems, the present invention is achieved through the following technical solution:

[0006] This invention relates to a shell-and-tube heat exchanger, comprising an outer tube and an inner tube. The inner tube is disposed inside the outer tube and has a spiral structure. A fluid outlet and a fluid inlet are respectively connected to the left and right ends of the inner tube. A through hole is formed on the right surface of the outer tube, which mates with the fluid inlet. A sealing ring is provided between the fluid inlet and the inner wall of the through hole. A fixing plate is provided on the outer surface of the fluid inlet. A first sealing groove is formed on the inner right surface of the outer tube. A sealing ring is adhered to the right surface of the fixing plate, and the sealing ring mates with the first sealing groove. A plurality of annular second sealing grooves are formed on the right surface of the fixing plate. A plurality of sealing strips are adhered to the inner right surface of the outer tube, corresponding one-to-one with the second sealing grooves and mate with each other. The sealing strips are hollow. A cover plate is provided on the outer surface of the fluid outlet, which mates with the left end of the outer tube. A sealing plug is adhered to the inner surface of the cover plate, which mates with the inner wall of the outer tube.

[0007] Combining the above structure, the cooperation between the sealing ring and the fluid inlet ensures the seal between the fluid inlet and the outer tube. The cooperation between the sealing ring and the first sealing groove effectively limits the extension length of the fluid inlet, thus facilitating the installation of the inner tube and improving the sealing effect between the fluid inlet and the outer tube. The cooperation between the hollow sealing strip and the second sealing groove further improves the sealing performance of the outside of the fluid inlet. The cooperation between the sealing plug and the inner wall of the outer tube ensures the seal between the fluid outlet and the outer tube, effectively preventing leakage during heat exchange.

[0008] The lower inner surface of the outer tube is inclined with several heat exchange support plates, and an outlet is opened on the right side of the lower surface of the outer tube. Several buffer plates are hinged to the inner wall of the outlet, and a buffer spring is connected between the buffer plate and the inner wall of the outlet. Under the action of the spiral structure of the inner tube, the flow time of the second medium in the inner tube is increased. Under the action of the inclination of the heat exchange support plates, the flow of the first medium is blocked, and heat exchange is achieved. Combined with the action of the buffer spring and the buffer plate, the outflow velocity of the first medium is effectively slowed down, thereby increasing the residence time of the first medium in the outer tube, so that the first medium and the second medium can fully exchange heat, effectively improving the heat exchange effect of the heat exchanger.

[0009] A sleeve is provided on the outer side of the cover plate. The left side of the inner wall of the sleeve is rotatably fitted with the cover plate, and an internal thread groove is provided on the right side of the inner wall of the sleeve. An external thread groove is provided on the left side of the outer surface of the outer tube. The internal thread groove and the external thread groove are threadedly fitted. Under the threaded fit of the internal thread groove and the external thread groove, it is easy to screw the sleeve on the outside of the outer tube, which facilitates the installation and fixation of the inner tube.

[0010] Preferably, a plurality of fixed sleeves are fixed on the upper side of the outer wall of the inner tube, and a movable rod is movably arranged inside the fixed sleeve. A limit plate is fixed at the lower end of the movable rod. The limit plate is movably engaged with the inner cavity of the fixed sleeve, and a return spring is connected between the limit plate and the inner wall of the fixed sleeve.

[0011] Preferably, a pressing plate is fixed to the end of the movable rod away from the limiting plate. The pressing plate has an arc-shaped structure and cooperates with the inner wall of the outer tube.

[0012] Preferably, a plurality of sealing flanges are adhered to the right side surface of the sealing ring, and the sealing flanges cooperate with the inner wall of the first sealing groove.

[0013] Preferably, an inlet is provided on the left side of the upper surface of the outer tube, and an outer inlet is connected to the outside of the inlet. An outer outlet is connected to the right side of the lower surface of the outer tube, and the outer outlet is connected to the outlet on the lower surface of the outer tube.

[0014] Preferably, a plurality of fixing blocks are fixed on the left side of the outer surface of the outer tube, the left end face of the fixing blocks cooperates with the right end face of the sleeve, a plurality of connecting plates are fixed on the right end face of the sleeve, the connecting plates correspond one-to-one with the fixing blocks, and locking bolts are provided on the connecting plates. Threaded holes are opened on the outer surface of the fixing blocks, and the locking bolts are threadedly engaged with the threaded holes.

[0015] Preferably, a screw plate is welded to one of the outer ends of the locking bolt.

[0016] Preferably, a handle is fixed on the outer side of the cover plate, and the handle cooperates with the fluid outlet.

[0017] The present invention has the following beneficial effects:

[0018] The present invention facilitates the screwing of the sleeve onto the outside of the outer tube through the threaded engagement of the internal and external threaded grooves, thus achieving the initial fixation of the inner tube. Combined with the threaded engagement of the locking bolt and the threaded hole, it facilitates the fixed connection of the connecting plate and the fixing block, thereby facilitating the installation of the inner tube and making it easier for subsequent disassembly, inspection and maintenance.

[0019] Meanwhile, the cooperation between the sealing ring and the fluid inlet ensures the seal between the fluid inlet and the outer tube. The cooperation between the sealing ring and the first sealing groove effectively limits the extension length of the fluid inlet, thus facilitating the installation of the inner tube and improving the sealing effect between the fluid inlet and the outer tube. The cooperation between the hollow sealing strip and the second sealing groove further improves the sealing performance of the outside of the fluid inlet. The cooperation between the sealing plug and the inner wall of the outer tube ensures the sealing performance between the fluid outlet and the outer tube, effectively preventing leakage during the heat exchange process.

[0020] The spiral structure of the inner tube increases the flow time of the second medium within it. The inclined heat exchange support plates effectively block the flow of the first medium, thus achieving a heat exchange effect. Combined with the combined action of the buffer spring and buffer plate, the outflow velocity of the first medium is effectively reduced, thereby increasing the residence time of the first medium inside the outer tube. This increases the heat exchange time between the first and second media, allowing for sufficient heat exchange and effectively improving the heat exchanger's performance.

[0021] Of course, any product implementing this invention does not necessarily need to achieve all of the advantages described above at the same time. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 This is a top view of the present invention;

[0025] Figure 3 for Figure 2 Schematic diagram of the structure of the mid-section AA;

[0026] Figure 4 for Figure 3 Schematic diagram of the structure of the mid-section BB;

[0027] Figure 5 for Figure 3 Enlarged structural diagram at point C;

[0028] Figure 6 for Figure 3 Enlarged structural diagram at point D;

[0029] Figure 7 for Figure 4 Enlarged structural diagram at point E;

[0030] Figure 8 for Figure 4 Enlarged structural diagram at point F;

[0031] Figure 9 This is a schematic diagram of the structure of the present invention.

[0032] The attached diagram lists the components represented by each number as follows:

[0033] 1. Outer tube; 2. Inner tube; 3. Fluid outlet; 4. Fluid inlet; 5. Sealing ring; 6. Fixed plate; 7. First sealing groove; 8. Sealing ring; 9. Second sealing groove; 10. Sealing strip; 11. Cover plate; 12. Sealing plug; 13. Buffer plate; 14. Buffer spring; 15. Heat exchange support plate; 16. Sleeve; 17. Movable rod; 18. Fixed sleeve; 19. Return spring; 20. Extrusion plate; 21. Sealing flange; 22. Outer inlet; 23. Outer outlet; 24. Fixed block; 25. Connecting plate; 26. Threaded hole; 27. Locking bolt; 28. Tightening plate; 29. ​​Handle. Detailed Implementation

[0034] 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.

[0035] In the description of this invention, it should be understood that the terms "upper," "middle," "outer," "inner," etc., which indicate orientation or positional relationship, are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the components or elements referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting this invention.

[0036] Please see Figures 1-9 As shown, the present invention is a shell-and-tube heat exchanger, including an outer tube 1 and an inner tube 2. The inner tube 2 is disposed inside the outer tube 1 and has a spiral structure. The left and right ends of the inner tube 2 are respectively connected to a fluid outlet 3 and a fluid inlet 4. A through hole is opened on the right surface of the outer tube 1, which cooperates with the fluid inlet 4. A sealing ring 5 is provided between the fluid inlet 4 and the inner wall of the through hole. A fixing plate 6 is provided on the outer surface of the fluid inlet 4. A first sealing groove 7 is opened on the right surface of the inner tube 1. A sealing ring 8 is adhered to the right surface of the fixing plate 6. The sealing ring 8 cooperates with the first sealing groove 7. A plurality of annular second sealing grooves 9 are opened on the right surface of the fixing plate 6. A plurality of sealing strips 10 are adhered to the right surface of the inner tube 1, which correspond one-to-one with the second sealing grooves 9 and cooperate with each other. The sealing strips 10 have a hollow structure. A cover plate 11 is provided on the outer surface of the fluid outlet 3. The cover plate 11 cooperates with the left end of the outer tube 1. A sealing plug 12 is adhered to the inner surface of the cover plate 11 and cooperates with the inner wall of the outer tube 1.

[0037] Combining the above structure, the sealing ring 5 and the fluid inlet 4 work together to ensure the seal between the fluid inlet 4 and the outer tube 1. The sealing ring 8 and the first sealing groove 7 work together to effectively limit the extension length of the fluid inlet 4, which facilitates the installation of the inner tube 2 and improves the sealing effect between the fluid inlet 4 and the outer tube 1. The hollow sealing strip 10 and the second sealing groove 9 work together to further improve the sealing performance of the outside of the fluid inlet 4. The sealing plug 12 and the inner wall of the outer tube 1 work together to ensure the sealing performance between the fluid outlet 3 and the outer tube 1, effectively preventing leakage during the heat exchange process.

[0038] Several heat exchange support plates 15 are inclinedly arranged on the lower inner surface of the outer tube 1. An outlet is opened on the right side of the lower surface of the outer tube 1. Several buffer plates 13 are hinged to the inner wall of the outlet. A buffer spring 14 is connected between the buffer plate 13 and the inner wall of the outlet. Under the action of the spiral structure of the inner tube 2, the flow time of the second medium in the inner tube 2 is increased. Under the inclination of the heat exchange support plates 15, the flow of the first medium is blocked and heat exchange is achieved. Combined with the action of the buffer spring 14 and the buffer plate 13, the outflow velocity of the first medium is effectively slowed down, thereby increasing the residence time of the first medium in the outer tube 1, so that the first medium and the second medium can fully exchange heat, effectively improving the heat exchange effect of the heat exchanger.

[0039] A sleeve 16 is provided on the outer side of the cover plate 11. The left side of the inner wall of the sleeve 16 is rotatably fitted with the cover plate 11, and an internal thread groove is opened on the right side of the inner wall of the sleeve 16. An external thread groove is opened on the left side of the outer surface of the outer tube 1. The internal thread groove and the external thread groove are threadedly fitted. Several fixing blocks 24 are fixed on the left side of the outer surface of the outer tube 1. The left end face of the fixing block 24 is fitted with the right end face of the sleeve 16. Several connecting plates 25 are fixed on the right end face of the sleeve 16. The connecting plates 25 correspond one-to-one with the fixing blocks 24, and locking bolts 27 are provided on the connecting plates 25. Threaded holes 26 are opened on the outer surface of the fixing blocks 24. The locking bolts 27 are threadedly fitted with the threaded holes 26. A screw plate 28 is welded to one side of the outer end of the cover plate 11, and a handle 29 is fixed to one side of the cover plate 11. The handle 29 cooperates with the fluid outlet 3. With the threaded engagement of the internal and external threaded grooves, it is easy to screw the sleeve 16 onto the outside of the outer tube 1, which facilitates the initial fixation of the inner tube 2. At the same time, with the threaded engagement of the locking bolt 27 and the threaded hole 26, it is easy to fix the connecting plate 25 and the fixing block 24 together, thereby achieving further fixation of the inner tube 2, which is convenient for later disassembly, inspection and maintenance. With the action of the handle 29, combined with the cover plate 11, it is easy to push the inner tube 2 into the outer tube 1 or pull the inner tube 2 out of the outer tube 1.

[0040] Several fixed sleeves 18 are fixed to the upper side of the outer wall of the inner tube 2. A movable rod 17 is movably arranged inside the fixed sleeve 18. A limit plate is fixed to the lower end of the movable rod 17. The limit plate is movablely engaged with the inner cavity of the fixed sleeve 18. A return spring 19 is connected between the limit plate and the inner wall of the fixed sleeve 18. A pressing plate 20 is fixed to the end of the movable rod 17 away from the limit plate. The pressing plate 20 has an arc-shaped structure and cooperates with the inner wall of the outer tube 1. Through the elastic action of the return spring 19, combined with the movable engagement of the movable rod 17 and the fixed sleeve 18, the movable rod 17 can be pushed outward. Under the cooperation of the arc-shaped pressing plate 20 and the inner wall of the outer tube 1, the pressing plate 20 abuts against the inner wall of the outer tube 1, effectively ensuring the stability of the inner tube 2.

[0041] Several sealing flanges 21 are adhered to the right side surface of the sealing ring 8. The sealing flanges 21 cooperate with the inner wall of the first sealing groove 7. The cooperation between the sealing flanges 21 and the inner wall of the first sealing groove 7 further improves the sealing performance between the sealing ring 8 and the first sealing groove 7.

[0042] An inlet is provided on the left side of the upper surface of the outer tube 1, and an outer inlet 22 is connected to the outside of the inlet. An outer outlet 23 is connected to the right side of the lower surface of the outer tube 1, and the outer outlet 23 is connected to the outlet on the lower surface of the outer tube 1. The outer inlet 22 and the outer outlet 23 facilitate the flow in and out of the first medium.

[0043] Example: In use, the invention first works by the combined action of the handle 29 and the cover plate 11, and by adjusting the movable rod 17 to press the return spring 19 into the fixed sleeve 18. The inner tube 2 is then adjusted to insert the fluid inlet 4 into the outer tube 1. Under the elastic action of the return spring 19, the movable rod 17 is pressed outwards, causing the arc-shaped pressing plate 20 to abut against the inner wall of the outer tube 1. As the inner tube 2 pushes into the outer tube 1, the fluid inlet 4 passes through the through hole on the right surface of the outer tube 1. Simultaneously, with the mutual cooperation of the internal and external threaded grooves, and the rotational cooperation of the sleeve 16 and the cover plate 11, Adjust the sleeve 16 to rotate to the right, and it will be screwed onto the outer surface of the outer tube 1 to achieve initial fixation of the inner tube 2. Continue to push the inner tube 2 to the right. Under the action of the fixing plate 6, it will drive the sealing ring 8 to insert into the bottom of the first sealing groove 7, so that the sealing flange 21 abuts against the bottom of the first sealing groove 7. At the same time, it will drive the sealing strip 10 to be squeezed into the corresponding second sealing groove 9. At this time, the sleeve 16 will just rotate to the rightmost side, and the cover plate 11 will complete the sealing of the left port of the outer tube 1. Under the action of the sealing plug 12, the fluid outlet 3 and the outer tube 1 will be sealed, effectively preventing leakage during the flow of the medium.

[0044] When the sleeve 16 is rotated to the rightmost position, it drives the connecting plate 25 to move to the outside of the fixing block 24, and one end of the locking bolt 27 is aligned with the threaded hole 26. By adjusting the locking bolt 27 with the screw plate 28, it is rotated inward to the bottom of the threaded hole 26, thus completing the installation and fixing of the inner tube 2. This also facilitates the disassembly, maintenance and repair of the inner tube 2 in the future.

[0045] The combined action of the return spring 19, the movable rod 17, the fixed sleeve 18, and the pressing plate 20 effectively supports the inner tube 2 and the inner wall of the outer tube 1, ensuring the stability of the inner tube 2.

[0046] During the heat exchange process, the outer inlet 22 and the outer outlet 23 are first connected to the liquid supply end and the liquid collection end of the first external medium, respectively. At the same time, the fluid outlet 3 and the fluid inlet 4 are connected to the liquid collection end and the liquid supply end of the second external medium, respectively. The first medium is introduced into the outer tube 1 through the outer inlet 22, and the second medium is introduced into the inner tube 2 through the fluid inlet 4.

[0047] The spiral structure of the inner tube 2 increases the flow time of the second medium in the inner tube 2. The tilting action of the heat exchange support plate 15 blocks the flow of the first medium into the outer tube 1, slowing down the flow speed of the first medium and achieving a heat exchange effect. Combined with the combined action of the buffer spring 14 and the buffer plate 13, the flow speed of the first medium out of the outer outlet 23 is effectively slowed down, thereby increasing the residence time of the first medium in the outer tube 1 and increasing the heat exchange time between the first medium and the second medium, so that the first medium and the second medium can fully exchange heat, effectively improving the heat exchange effect of the heat exchanger.

[0048] The direction of fluid inlet 4 is the flow direction of the first medium. Therefore, a sealing structure is added to the outside of fluid inlet 4 to prevent leakage caused by impact and hydraulic action when the first medium flows to the right.

[0049] It should be further noted that the installation structure, connection method, or setting method of each component in this invention are all common mechanical methods, and any method that can achieve its beneficial effect can be implemented.

[0050] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0051] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A shell-and-tube heat exchanger, comprising an outer tube (1) and an inner tube (2), characterized in that, The inner tube (2) is located inside the outer tube (1). The inner tube (2) has a spiral structure. The left and right ends of the inner tube (2) are respectively connected to a fluid outlet (3) and a fluid inlet (4). The right surface of the outer tube (1) has a through hole that matches the fluid inlet (4). A sealing ring (5) is provided between the fluid inlet (4) and the inner wall of the through hole. A fixing plate (6) is provided on the outer surface of the fluid inlet (4). The right surface of the inner tube (1) has a first sealing groove (7). A sealing ring (8) is adhered to the right surface of the fixing plate (6). The sealing ring (8) and the first sealing groove (7) cooperate with each other. The right surface of the fixed plate (6) is provided with several annular second sealing grooves (9). Several sealing strips (10) are adhered to the right surface of the inner tube (1), which correspond one-to-one with the second sealing grooves (9) and cooperate with each other. The sealing strips (10) are hollow. The outer surface of the fluid outlet (3) is provided with a cover plate (11). The cover plate (11) cooperates with the left end of the outer tube (1). The inner surface of the cover plate (11) is adhered with a sealing plug (12), which cooperates with the inner wall of the outer tube (1). The lower inner surface of the outer tube (1) is provided with several heat exchange support plates (15) at an incline. An outlet is opened on the right side of the lower surface of the outer tube (1). Several buffer plates (13) are hinged to the inner wall of the outlet. A buffer spring (14) is connected between the buffer plate (13) and the inner wall of the outlet. A sleeve (16) is provided on the outside of the cover plate (11). The left side of the inner wall of the sleeve (16) is rotatably engaged with the cover plate (11). An internal thread groove is provided on the right side of the inner wall of the sleeve (16). An external thread groove is provided on the left side of the outer surface of the outer tube (1). The internal thread groove and the external thread groove are threadedly engaged.

2. The shell-and-tube heat exchanger according to claim 1, characterized in that, Several fixed sleeves (18) are fixed on the upper side of the outer wall of the inner tube (2). A movable rod (17) is movably arranged inside the fixed sleeve (18). A limit plate is fixed at the lower end of the movable rod (17). The limit plate is movably engaged with the inner cavity of the fixed sleeve (18). A return spring (19) is connected between the limit plate and the inner wall of the fixed sleeve (18).

3. A shell-and-tube heat exchanger according to claim 2, characterized in that, The end of the movable rod (17) away from the limiting plate is fixed with a pressing plate (20). The pressing plate (20) has an arc-shaped structure and cooperates with the inner wall of the outer tube (1).

4. A shell-and-tube heat exchanger according to claim 3, characterized in that, Several sealing flanges (21) are adhered to the right side surface of the sealing ring (8), and the sealing flanges (21) cooperate with the inner wall of the first sealing groove (7).

5. A shell-and-tube heat exchanger according to claim 4, characterized in that, An inlet is provided on the left side of the upper surface of the outer tube (1), and an outer inlet (22) is connected to the outside of the inlet. An outer outlet (23) is connected to the right side of the lower surface of the outer tube (1), and the outer outlet (23) is connected to the outlet on the lower surface of the outer tube (1).

6. A shell-and-tube heat exchanger according to claim 5, characterized in that, Several fixing blocks (24) are fixed on the left side of the outer surface of the outer tube (1). The left end face of the fixing block (24) cooperates with the right end face of the sleeve (16). Several connecting plates (25) are fixed on the right end face of the sleeve (16). The connecting plates (25) correspond one-to-one with the fixing blocks (24). Locking bolts (27) are provided on the connecting plates (25). Threaded holes (26) are opened on the outer surface of the fixing block (24). The locking bolts (27) are threadedly engaged with the threaded holes (26).

7. A shell-and-tube heat exchanger according to claim 6, characterized in that, A screw plate (28) is welded to the outer end of the locking bolt (27).

8. A shell-and-tube heat exchanger according to claim 7, characterized in that, A handle (29) is fixed on the outer side of the cover plate (11), and the handle (29) cooperates with the fluid outlet (3).

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