Efficient finned tube heat exchanger

Abstract

An efficient finned tube heat exchanger relates to the technical field of finned tube heat exchangers and comprises a heat exchange box body, a plurality of rows of base tubes are horizontally arranged in the heat exchange box body side by side, a liquid drainage cover and a plurality of upper connecting covers are detachably arranged at the top of the heat exchange box body, and a liquid inlet cover and a plurality of lower connecting covers are detachably arranged at the bottom of the heat exchange box body. The upper connecting covers and the lower connecting covers are arranged in a staggered mode, two ports of each base tube are communicated with an inner cavity of the corresponding upper connecting cover and an inner cavity of the corresponding lower connecting cover respectively and detachably connected with the heat exchange box body, and upper ports of the row of base tubes on the outermost side are communicated with an inner cavity of the liquid discharging cover. The lower ports of the row of base tubes on the other side are communicated with the liquid inlet cover, a plurality of fin sets are evenly distributed on the outer walls of the base tubes in the axial direction, and each fin set comprises a plurality of first fins and second fins which are evenly distributed in the axial direction of the base tubes. The problem that an existing finned tube heat exchanger is long in heat transfer path is solved. And the maintenance cost is high. And the contact uniformity of the fluid and the inner wall of the base tube is poor.

Description

Technical Field

[0001] The present invention relates to the technical field of finned tube heat exchangers, and specifically to a high-efficiency finned tube heat exchanger. Background Art

[0002] The finned tube heat exchanger is one of the earliest and most successful discoveries in the process of improving tubular heat exchangers. This method is still the most widely used among all various methods for enhancing heat transfer of tubular heat transfer surfaces. Finned tube heat exchangers are widely used in power, chemical industry, petrochemical industry, air conditioning engineering, and refrigeration engineering. The basic heat transfer element of a finned tube heat exchanger is a finned tube, which is composed of a base tube and fins.

[0003] During the use of existing finned tube heat exchangers, some deficiencies have gradually emerged, mainly in the following aspects: First, the heat transfer path is long, resulting in low heat transfer efficiency. Specifically, the base tube and the fins are connected by welding. When the base tube and the fins are welded, the molten solder or brazing material accumulates at the connection between the fins and the base tube, forming welding protrusions (such as weld beads or weld reinforcement). Heat must pass through this area to be transferred to the fins, increasing the heat transfer path by 10% - 30%, rising the equivalent thermal resistance, and thus leading to low heat transfer efficiency.

[0004] Second, the equipment maintenance cost is high. Specifically, during the use of the heat exchanger, the fins are continuously impacted by the fluid, and fatigue cracks may appear at the roots of some fins. When the fins are damaged, the heat exchange capacity is greatly reduced, affecting the heat exchange effect. Since the fins and the base tube are connected by welding, the entire base tube needs to be replaced during equipment maintenance, so the maintenance cost is high.

[0005] Third, the contact uniformity between the fluid inside the base tube and the inner wall of the base tube is poor, resulting in low heat exchange efficiency. Specifically, when the fluid flows inside the base tube, the near-wall fluid and the fluid at the center of the tube flow stably along the axial direction of the base tube. The near-wall fluid directly contacts the inner wall of the base tube for heat exchange, and the fluid at the center of the tube exchanges heat through the near-wall fluid and the inner wall of the base tube. This indirect heat exchange method will greatly reduce the heat exchange efficiency.

[0006] In summary, it is obvious that there are inconveniences and defects in the actual use of the existing technology, so it is necessary to make improvements. Summary of the Invention

[0007] Aiming at the defects in the existing technology, the technical problem to be solved by the present invention is to provide a high-efficiency finned tube heat exchanger. In this heat exchanger, the base tube and the fins are in direct contact, avoiding the additional thermal resistance of the welding protrusions. Heat is directly transferred from the base tube to the fins, with a shorter heat transfer path and improved heat transfer efficiency; This heat exchanger can replace the fins on the base tube individually, reducing the equipment maintenance cost; The fluid inside the base tube of this heat exchanger can uniformly contact the inner wall of the base tube for heat exchange, improving the heat exchange efficiency of the equipment.

[0008] To solve the above problems, the present invention provides the following technical solutions: An efficient finned tube heat exchanger, comprising a heat exchange box body, inside which a number of columns of base tubes are horizontally arranged in parallel. A detachable drain cover and a number of upper connection covers are provided at the top of the heat exchange box body, and a detachable liquid inlet cover and a number of lower connection covers are provided at the bottom of the heat exchange box body. The upper connection covers and the lower connection covers are arranged in a staggered manner. The two ports of the base tube are respectively communicated with the inner cavities of the upper connection cover and the lower connection cover, and the two ports of the base tube are detachably connected to the heat exchange box body. The upper port of the outermost side column of the base tubes is communicated with the inner cavity of the drain cover, and the lower port of the other outermost side column of the base tubes is communicated with the liquid inlet cover. A number of fin groups are uniformly distributed along the axial direction on the outer wall of the base tube. The fin group includes a number of first fins and second fins that are uniformly distributed along the axial direction of the base tube. The first fin and the second fin are both semi-circular structures and are inserted into each other, and both the first fin and the second fin are inserted into the base tube. A flow disturbing component is provided inside the base tube.

[0009] As an optimized scheme, a number of columns of upper positioning flanges and lower positioning flanges communicated with its inner cavity are respectively horizontally arranged in parallel at the top and bottom of the heat exchange box body. The upper port of the base tube extends upward through the upper positioning flange to the outside and is fixedly connected with a fixed flange. The lower port of the base tube extends downward through the lower positioning flange to the outside and is provided with a threaded flange threadedly connected thereto. The upper positioning flange and the fixed flange are detachably connected, and the lower positioning flange and the threaded flange are detachably connected.

[0010] As an optimized scheme, sealing washers are provided between the upper positioning flange and the fixed flange and between the lower positioning flange and the threaded flange. The upper positioning flange and the fixed flange and the lower positioning flange and the threaded flange are detachably connected by bolts and nuts.

[0011] As an optimized scheme, a number of annular grooves are uniformly distributed along the axial direction on the outer wall of the base tube. The longitudinal section of the annular groove is trapezoidal. The inner walls of the first fin and the second fin are arranged in conformity with the annular groove. Two inserting plates are fixedly provided at the end of the second fin, and two inserting slots are provided at the end of the first fin.

[0012] As an optimized scheme, a number of threaded cylinders are uniformly distributed along the axial direction on the outer wall of the base tube. Positioning grooves are provided on the outer walls of the first fin and the second fin, and pressing plates are provided in the positioning grooves of the first fin and the second fin. The pressing plates are detachably connected to the threaded cylinders through positioning bolts.

[0013] As an optimized solution, the spoiler assembly includes a first partition plate and a second partition plate coaxially arranged with the base pipe. Waterproof rings are fixedly sleeved on the outer walls of the first partition plate and the second partition plate, and the waterproof rings are in contact with the base pipe. A number of first exchange pipes and second exchange pipes are alternately arranged circumferentially between the first partition plate and the second partition plate. Two ends of the first exchange pipe respectively penetrate through the middle area of the first partition plate and the edge area of the second partition plate, and two ends of the second exchange pipe respectively penetrate through the edge area of the first partition plate and the middle area of the second partition plate. A number of spiral spoiler vanes are circumferentially distributed at the edge areas of the opposite end parts of the first partition plate and the second partition plate, and one end of the spiral spoiler vane is fixedly connected to the base pipe.

[0014] As an optimized solution, a drain pipe and a feed pipe which are communicated are respectively arranged at the top of the drain cover and the bottom of the feed cover, and liquid passing pipes communicated with the inner cavity are arranged at the opposite end parts of the heat exchange box body.

[0015] As an optimized solution, sealing gaskets are arranged between the drain cover, the upper connection cover, the feed cover, the lower connection cover and the heat exchange box body, and the drain cover, the upper connection cover, the feed cover, the lower connection cover and the heat exchange box body are detachably connected by bolts.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. During heat exchange, one kind of fluid passes through the heat exchange box body through the liquid passing pipe, and the other kind of fluid enters the feed cover, and then reciprocally passes through the base pipe, the upper connection cover and the lower connection cover, and finally is discharged from the drain cover. The fluid in the base pipe exchanges heat with the fluid in the heat exchange box body through the base pipe, the first fin and the second fin. The first fin and the second fin are inserted on the outer wall of the base pipe, and the first fin and the second fin are in direct contact with the base pipe, avoiding the additional thermal resistance of the welding protrusion. The heat is directly transferred from the base pipe to the first fin and the second fin, and the heat transfer path is shorter, improving the heat transfer efficiency. 2. When cleaning the dirt on the outer wall of the base pipe, first remove the bolts and nuts of the connecting threaded flange and the lower positioning flange, rotate the threaded flange to separate it from the base pipe, then remove the bolts and nuts of the connecting fixed flange and the upper positioning flange, and finally take out the base pipe for cleaning. Compared with the method of directly cleaning the base pipe inside the heat exchange box body with a high-pressure water gun, the cleaning method of this heat exchanger has a better cleaning effect on the base pipe, thereby ensuring the heat exchange performance of the heat exchanger. 3. When replacing the damaged first fin or second fin, repeat the above operation to take out the base pipe, then remove the pressing plate and take out and replace the damaged first fin or second fin. This heat exchanger can replace the first fin or the second fin on the base pipe singly. Compared with the maintenance method of directly replacing the base pipe, the maintenance cost of this heat exchanger is extremely low. 4. The insertion plate and the slot can enable the first fin and the second fin to be inserted into each other. This structure not only facilitates the installation of the first fin and the second fin, but also improves the overall strength of the first fin and the second fin. 5. When the fluid flows inside the base tube, the spiral turbulator can turbulize the near-wall fluid, disrupt the flow direction of the near-wall fluid, and make the near-wall fluid uniformly contact the inner wall of the base tube. When the fluid passes through the first exchange tube and the second exchange tube, the positions of the fluid at the tube center and the near-wall fluid are interchanged, and the spiral turbulator on the other side turbulizes the near-wall fluid after the interchange. The fluid inside the base tube of this heat exchanger can uniformly contact the inner wall of the base tube for heat exchange, improving the heat exchange efficiency of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0018] Figure 1 is a schematic structural diagram of the present invention; Figure 2 is a schematic structural diagram of the base tube of the present invention; Figure 3 is a schematic structural diagram of the fin group of the present invention; Figure 4 is a schematic structural diagram of the turbulator assembly of the present invention; Figure 5 is a schematic structural diagram of the annular groove of the present invention; Figure 6 is a schematic structural diagram of the first fin and the second fin of the present invention; Figure 7 is a schematic structural diagram between the first partition plate and the second partition plate of the present invention; Figure 8 is a schematic structural diagram of the whole of the present invention.

[0019] In the figure: 1 - heat exchange box body; 2 - drain pipe; 3 - drain cover; 4 - upper connection cover; 5 - upper positioning flange; 6 - sealing gasket; 7 - base tube; 8 - liquid inlet cover; 9 - liquid inlet pipe; 10 - lower positioning flange; 11 - lower connection cover; 12 - liquid passing pipeline; 13 - threaded flange; 14 - fin group; 15 - fixed flange; 16 - sealing washer; 17 - first fin; 18 - annular groove; 19 - threaded cylinder; 20 - second fin; 21 - positioning groove; 22 - pressing plate; 23 - positioning bolt; 24 - slot; 25 - insertion plate; 26 - turbulator assembly; 27 - first partition plate; 28 - first exchange tube; 29 - second partition plate; 30 - spiral turbulator; 31 - second exchange tube; 32 - waterproof ring. Detailed implementation manners

[0020] Hereinafter, embodiments of the technical solution of the present invention will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and therefore are only examples and cannot be used to limit the protection scope of the present invention.

[0021] As Figures 1 to 8 shown, a high-efficiency finned tube heat exchanger includes a heat exchange box body 1. Inside the heat exchange box body 1, a number of columns of base tubes 7 are horizontally arranged in parallel. At the top of the heat exchange box body 1, a liquid discharge cover 3 and a number of upper connection covers 4 are detachably arranged. At the bottom of the heat exchange box body 1, a liquid inlet cover 8 and a number of lower connection covers 11 are detachably arranged. The upper connection covers 4 and the lower connection covers 11 are arranged in a staggered manner. Two ports of the base tube 7 are respectively communicated with the inner cavities of the upper connection cover 4 and the lower connection cover 11. Both ports of the base tube 7 are detachably connected to the heat exchange box body 1. Among them, the upper port of the outermost column of base tubes 7 is communicated with the inner cavity of the liquid discharge cover 3, and the lower port of the outermost column of base tubes 7 is connected to the liquid inlet cover 8. A number of fin groups 14 are evenly distributed along the axial direction on the outer wall of the base tube 7. The fin group 14 includes a number of first fins 17 and second fins 20 that are evenly distributed along the axial direction of the base tube 7. Both the first fin 17 and the second fin 20 are semi-circular structures and are inserted into each other. Both the first fin 17 and the second fin 20 are inserted into the base tube 7. A flow disturbance component 26 is arranged inside the base tube 7.

[0022] A number of columns of upper positioning flanges 5 and lower positioning flanges 10 that are communicated with the inner cavity thereof are horizontally arranged in parallel at the top and bottom of the heat exchange box body 1 respectively. The upper port of the base tube 7 extends upward through the upper positioning flange 5 to the outside and is fixedly connected with a fixed flange 15. The lower port of the base tube 7 extends downward through the lower positioning flange 10 to the outside and is provided with a threaded flange 13 that is threadedly connected thereto. The upper positioning flange 5 and the fixed flange 15 are detachably connected. The lower positioning flange 10 and the threaded flange 13 are detachably connected.

[0023] Sealing gaskets 16 are arranged between the upper positioning flange 5 and the fixed flange 15 and between the lower positioning flange 10 and the threaded flange 13. The upper positioning flange 5 and the fixed flange 15 and the lower positioning flange 10 and the threaded flange 13 are all detachably connected by bolts and nuts.

[0024] A number of annular grooves 18 are evenly distributed along the axial direction on the outer wall of the base tube 7. The longitudinal section of the annular groove 18 is trapezoidal. The inner walls of the first fin 17 and the second fin 20 are arranged in conformity with the annular groove 18. Two insertion plates 25 are fixedly arranged at the end of the second fin 20. Two insertion slots 24 are arranged at the end of the first fin 17.

[0025] A plurality of threaded cylinders 19 are evenly distributed along the axial direction on the outer wall of the base tube 7. Positioning grooves 21 are provided on the outer walls of the first fin 17 and the second fin 20. Pressure plates 22 are provided in the positioning grooves 21 of the first fin 17 and the second fin 20. The pressure plates 22 are detachably connected to the threaded cylinders 19 through positioning bolts 23.

[0026] The flow disturbing assembly 26 includes a first partition plate 27 and a second partition plate 29 coaxially arranged with the base tube 7. Waterproof rings 32 are fixedly sleeved on the outer walls of the first partition plate 27 and the second partition plate 29. The waterproof rings 32 are abutted against the base tube 7. A plurality of alternately arranged first exchange tubes 28 and second exchange tubes 31 are evenly distributed along the circumferential direction between the first partition plate 27 and the second partition plate 29. Two ends of the first exchange tube 28 respectively penetrate through the middle area of the first partition plate 27 and the edge area of the second partition plate 29. Two ends of the second exchange tube 31 respectively penetrate through the edge area of the first partition plate 27 and the middle area of the second partition plate 29. A plurality of spiral flow disturbing vanes 30 are evenly distributed along the circumferential direction at the edge areas of the opposite end parts of the first partition plate 27 and the second partition plate 29. One end of the spiral flow disturbing vane 30 is fixedly connected to the base tube 7.

[0027] A drain pipe 2 and a liquid inlet pipe 9 which are communicated are respectively provided at the top of the drain cover 3 and the bottom of the liquid inlet cover 8. Liquid passing pipes 12 communicated with the inner cavity thereof are provided at the opposite end parts of the heat exchange box body 1.

[0028] Sealing gaskets 6 are provided between the drain cover 3, the upper connecting cover 4, the liquid inlet cover 8 and the lower connecting cover 11 and the heat exchange box body 1. The drain cover 3, the upper connecting cover 4, the liquid inlet cover 8 and the lower connecting cover 11 are detachably connected to the heat exchange box body 1 through bolts.

[0029] The working principle of this device is as follows: During heat exchange, one of the fluids passes through the heat exchange box body 1 through the liquid passing pipe 12, and the other fluid enters the liquid inlet cover 8, and then reciprocally passes through the base tube 7, the upper connecting cover 4 and the lower connecting cover 11, and finally is discharged from the drain cover 3. The fluid in the base tube 7 exchanges heat with the fluid in the heat exchange box body 1 through the base tube 7, the first fin 17 and the second fin 20. The first fin 17 and the second fin 20 are inserted on the outer wall of the base tube 7. The first fin 17 and the second fin 20 are in direct contact with the base tube 7, avoiding the additional thermal resistance of the welding protrusions. The heat is directly transferred from the base tube 7 to the first fin 17 and the second fin 20, and the heat transfer path is shorter, improving the heat transfer efficiency. When cleaning the dirt on the outer wall of the base tube 7, first, the bolts and nuts connecting the threaded flange 13 and the lower positioning flange 10 are disassembled, and the threaded flange 13 is rotated to be separated from the base tube 7. Then, the bolts and nuts connecting the connecting fixed flange 15 and the upper positioning flange 5 are disassembled. Finally, the base tube 7 is taken out for cleaning. Compared with the method of directly cleaning the base tube 7 inside the heat exchange box body 1 with a high-pressure water gun, the cleaning method of this heat exchanger has a better cleaning effect on the base tube 7, thereby ensuring the heat exchange performance of the heat exchanger. When replacing the damaged first fin 17 or second fin 20, repeat the above operation to remove the base tube 7. Then, disassemble the pressing plate 22, remove and replace the damaged first fin 17 or second fin 20. This heat exchanger can replace the first fin 17 or second fin 20 on the base tube 7 individually. Compared with the maintenance method of directly replacing the base tube 7, the maintenance cost of this heat exchanger is extremely low; The insertion plate 25 and the slot 24 enable the first fin 17 and the second fin 20 to be inserted into each other. This structure not only facilitates the installation of the first fin 17 and the second fin 20, but also improves the overall strength of the first fin 17 and the second fin 20; When the fluid flows inside the base tube 7, the spiral turbulator 30 can turbulize the near-wall fluid, disrupt the flow direction of the near-wall fluid, and make the near-wall fluid uniformly contact the inner wall of the base tube 7. When the fluid passes through the first exchange tube 28 and the second exchange tube 31, the positions of the fluid at the tube center and the near-wall fluid are interchanged. The spiral turbulator 30 on the other side turbulizes the interchanged near-wall fluid. The fluid inside the base tube 7 of this heat exchanger can uniformly contact the inner wall of the base tube 7 for heat exchange, improving the heat exchange efficiency of the equipment.

[0030] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered by the scope of the claims and the description of the present invention.

Claims

1. A high-efficiency fin-tube heat exchanger, characterized in that: The invention comprises a heat exchange box (1), wherein a plurality of base tubes (7) are arranged horizontally in parallel inside the heat exchange box (1), a detachably arranged liquid discharge cover (3) and a plurality of upper connecting covers (4) are arranged on the top of the heat exchange box (1), and a detachably arranged liquid inlet cover (8) and a plurality of lower connecting covers (11) are arranged on the bottom of the heat exchange box (1), wherein the upper connecting covers (4) and the lower connecting covers (11) are arranged in a staggered manner, and the two ends of the base tube (7) are respectively connected to the inner cavity of the upper connecting cover (4) and the inner cavity of the lower connecting cover (11), and the two ends of the base tube (7) are both detachably connected to the heat exchange box (1), wherein the outermost end of the base tube (7) is connected to the heat exchange box (1) and the inner cavity of the upper connecting cover (4) and the inner cavity of the lower connecting cover (11) are connected to the heat exchange box (1) and the inner cavity of the lower connecting cover (11) are connected to the heat exchange box (1) and the inner cavity of the lower connecting cover (11) are connected to the heat exchange box (1) and the inner cavity of the upper connecting cover (4) and ... The upper ports of the base tubes (7) in a side row are connected to the inner cavity of the liquid discharge cover (3), and the lower ports of the base tubes (7) in a sidemost row are connected to the liquid inlet cover (8). The outer wall of the base tube (7) is evenly distributed with a plurality of fin groups (14) along the axial direction. The fin group (14) includes a plurality of first fins (17) and second fins (20) evenly distributed along the axial direction of the base tube (7). The first fins (17) and the second fins (20) are both semicircular structures and are inserted into each other. The first fins (17) and the second fins (20) are both inserted into the base tube (7). A spoiler component (26) is provided inside the base tube (7).

2. A high-efficiency fin-tube heat exchanger according to claim 1, characterized in that: The top and bottom of the heat exchange box (1) are horizontally and parallelly provided with a plurality of rows of upper positioning flanges (5) and lower positioning flanges (10) connected to the inner cavity thereof; the upper end of the base pipe (7) extends upward through the upper positioning flange (5) to the outside and is fixedly connected to a fixing flange (15); the lower end of the base pipe (7) extends downward through the lower positioning flange (10) to the outside and is provided with a threaded flange (13) threadedly connected thereto; the upper positioning flange (5) is detachably connected to the fixing flange (15); and the lower positioning flange (10) is detachably connected to the threaded flange (13).

3. A high-efficiency fin-tube heat exchanger according to claim 2, characterized in that: A sealing gasket (16) is provided between the upper positioning flange (5) and the fixed flange (15) and between the lower positioning flange (10) and the threaded flange (13); the upper positioning flange (5) and the fixed flange (15) and the lower positioning flange (10) and the threaded flange (13) are detachably connected via bolts and nuts.

4. The high-efficiency fin-tube heat exchanger according to claim 1, characterized in that: The outer wall of the base tube (7) is evenly distributed with a plurality of annular grooves (18) along the axial direction, the longitudinal section of the annular grooves (18) is trapezoidal, the inner walls of the first fin (17) and the second fin (20) are arranged in the shape of the annular grooves (18), two plug plates (25) are fixedly provided at the end of the second fin (20), and two slots (24) are provided at the end of the first fin (17).

5. A high-efficiency fin-tube heat exchanger according to claim 4, characterized in that: The outer wall of the base tube (7) is evenly distributed with a plurality of threaded tubes (19) along the axial direction, the outer walls of the first fin (17) and the second fin (20) are both provided with positioning grooves (21), and the positioning grooves (21) of the first fin (17) and the second fin (20) are both provided with pressure plates (22), and the pressure plates (22) are detachably connected to the threaded tubes (19) via positioning bolts (23).

6. A high-efficiency fin-tube heat exchanger according to claim 1, characterized in that: The spoiler assembly (26) comprises a first baffle (27) and a second baffle (29) which are coaxially arranged with the base tube (7); the outer walls of the first baffle (27) and the second baffle (29) are both fixedly sleeved with a waterproof ring (32); the waterproof ring (32) abuts against the base tube (7); a plurality of first exchange tubes (28) and second exchange tubes (31) are evenly distributed along the circumferential direction between the first baffle (27) and the second baffle (29); the two ends of the first exchange tube (28) respectively penetrate the middle area of ​​the first baffle (27) and the edge area of ​​the second baffle (29); the two ends of the second exchange tube (31) respectively penetrate the edge area of ​​the first baffle (27) and the middle area of ​​the second baffle (29); a plurality of spiral spoilers (30) are evenly distributed along the circumferential direction at the edge areas of the ends opposite to each other of the first baffle (27) and the second baffle (29); one end of the spiral spoiler (30) is fixedly connected to the base tube (7).

7. The high-efficiency fin-tube heat exchanger according to claim 1, characterized in that: The top of the liquid discharge cover (3) and the bottom of the liquid inlet cover (8) are respectively provided with a liquid discharge pipe (2) and a liquid inlet pipe (9) which are connected to each other, and the opposite ends of the heat exchange box (1) are provided with liquid passage pipes (12) which are connected to the inner cavity thereof.

8. The high-efficiency fin-tube heat exchanger according to claim 1, characterized in that: Sealing gaskets (6) are provided between the liquid drain cover (3), the upper connecting cover (4), the liquid inlet cover (8) and the lower connecting cover (11) and the heat exchange box (1); the liquid drain cover (3), the upper connecting cover (4), the liquid inlet cover (8) and the lower connecting cover (11) and the heat exchange box (1) are detachably connected via bolts.

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