Plate-fin heat exchanger

Abstract

The plate-fin heat exchanger relates to the technical field of heat exchangers and comprises an outer shell, a liquid inlet and a liquid outlet are formed in the two sides of the outer shell respectively, a supporting bottom plate is arranged on the bottom face of the outer shell, a circulation mechanism is arranged in the center of the outer shell, and the circulation mechanism is formed by stacking a plurality of heat conduction assemblies up and down. Each group of heat conduction assembly is composed of two ventilation parts and a liquid flowing assembly, two side sealing plates are arranged between the two ventilation parts, each ventilation part comprises two interval sealing plates, an outer fin is arranged between the two interval sealing plates, the two sides of the outer fin are each provided with a short sealing strip, and the liquid flowing assembly is arranged between the two ventilation parts. The liquid flowing assembly comprises a plurality of lower heat exchange pipes and upper heat exchange pipes, the lower heat exchange pipes are arranged on the upper surface of the ventilation component located on the lower portion, the upper heat exchange pipes are arranged on the bottom face of the ventilation component located on the upper portion, and in the using process, the uniformity and stability of heat exchange of equipment are improved by arranging a circulation mechanism.

Description

Technical Field

[0001] The invention relates to the technical field of heat exchangers, in particular to a plate-fin heat exchanger. Background Art

[0002] As a highly efficient and compact heat exchange device, plate-fin heat exchanger has been widely used in industrial production. Its structural feature is that a series of thin metal fins and partitions are alternately stacked to form a complex channel system, so that hot and cold fluids can efficiently exchange heat in these channels. The extended surface area of ​​the fins greatly increases the contact area between the fluid and the heat exchange surface, thereby significantly improving the heat exchange efficiency.

[0003] There are still some shortcomings in the existing plate-fin heat exchanger technology. Traditional heat exchangers often adopt a single fluid channel design, and the flow path of the fluid in the heat exchanger is relatively fixed, resulting in limited contact area between the fluid and the wall of the heat exchange tube, and it is difficult to further improve the heat exchange efficiency. In addition, due to the uneven residence time of the fluid in the heat exchanger, some fluids have too long a residence time in the heat exchange tube, which can easily cause excessive heat exchange, while some fluids may fail to achieve the expected heat exchange effect due to too short a residence time, thereby affecting the overall heat exchange uniformity and stability. Moreover, when dealing with fluids that do not meet the temperature standards, existing heat exchangers often lack an effective reflux mechanism. Once the fluid fails to reach the predetermined temperature standard after the initial heat exchange, these fluids are usually discharged directly, resulting in energy waste. At the same time, due to the lack of a flexible switching mechanism, the flow direction and path of the fluid during the heat exchange process are often not adjustable, which limits the adaptability and flexibility of the heat exchanger under different working conditions and causes inconvenience in use. Summary of the invention

[0004] The object of the present invention is to provide a plate-fin heat exchanger to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solution: a plate-fin heat exchanger, comprising: An outer shell, wherein a liquid inlet and a liquid outlet are respectively provided on two sides of the outer shell, a supporting bottom plate is provided on the bottom surface of the outer shell, and a circulation mechanism is provided at the center of the outer shell; The circulation mechanism includes a plurality of heat-conducting components stacked up and down, a group of heat-conducting components consists of two ventilation components and a liquid flow component, two side sealing plates are arranged between the two ventilation components, the ventilation components include: two spacing sealing plates, an outer fin is arranged between the two spacing sealing plates, a short sealing strip is arranged on both sides of the outer fin, the liquid flow component is arranged between the two ventilation components, the liquid flow component includes: a plurality of lower heat exchange tubes and upper heat exchange tubes, the lower heat exchange tubes are arranged on the upper surface of the ventilation component located below, the upper heat exchange tubes are arranged on the bottom surface of the ventilation component located above, the upper heat exchange tubes are connected to the lower heat exchange tubes by a connecting liquid tube, and the liquid storage capacity inside the upper heat exchange tubes and the lower heat exchange tubes closer to the liquid outlet is lower.

[0006] Furthermore, an external liquid temperature detector is provided on the side surface of the upper heat exchange tube closest to the liquid outlet, and a liquid transfer box is also provided at one end of the upper heat exchange tube. A small motor is provided on the side surface of the liquid transfer box, and a liquid transfer frame is provided inside the liquid transfer box.

[0007] Furthermore, both side surfaces and the bottom surface of the liquid transfer frame are provided with liquid flow openings, the three liquid flow openings are interconnected, the output shaft end of the small motor is connected to one end of the liquid transfer frame, and a transfer box is provided on the bottom surface of the liquid transfer box, and the transfer box is connected to the interior of the liquid transfer box.

[0008] Furthermore, the liquid flow component also includes a reflux component, which includes: a plurality of valve boxes, each of which is arranged on the upper surface of the ventilation component located below, a liquid reflux pipe is arranged between every two of the valve boxes, one end of the liquid reflux pipe is connected to the bottom surface of the transfer box, and the bottom surface of the transfer box is provided with a connection port that matches the liquid reflux pipe.

[0009] Furthermore, two inclined slope plates are provided on the upper surface of the ventilation component located below, and a reflux outlet pipe is provided on the upper surface of the inclined slope plate. A liquid outlet pipe is provided on the side surface of the valve box, and the other end of the liquid outlet pipe is connected to the reflux outlet pipe, and one end of the reflux outlet pipe is connected to the liquid outlet.

[0010] Furthermore, a liquid pipe plugging cover is provided at one end of the liquid outlet pipe, a movable liquid discharge pipe is provided inside the liquid outlet pipe, and a plurality of leakage openings are provided on the surface of the movable liquid discharge pipe.

[0011] Furthermore, the surfaces of the liquid pipe plugging cover and the liquid outlet pipe are both provided with side connecting pieces that cooperate with each other, a connecting spring is provided between two corresponding side connecting pieces, and liquid outlet side ports are provided on both side surfaces of the valve box.

[0012] Furthermore, an internal liquid temperature detector is provided on the inner side surface of the valve box body, a liquid outlet opening is also provided on the surface of the liquid outlet side port, an installation slot is provided at the center of the liquid outlet side port, a control motor is provided inside the installation slot, and a rotating cover plate is provided at the end of the output shaft of the control motor.

[0013] Compared with the prior art, the present invention has the following beneficial effects: 1. When in use, a heat conduction component is provided, and the connection effect of multiple heat exchange tubes (lower heat exchange tube and upper heat exchange tube) stacked up and down is utilized to form a continuous fluid channel, thereby increasing the contact area between the fluid and the heat exchange tube wall, and allowing the fluid to pass through the heat exchange tube multiple times during the flow process, thereby fully absorbing or releasing heat, and significantly improving the heat exchange efficiency. The size of the heat exchange tube in the heat conduction component gradually decreases, and the heat exchange tube closer to the liquid outlet has a lower internal liquid storage capacity. This feature makes the fluid's initial retention time in the heat exchange tube longer during the flow process, allowing the liquid to better receive the heat exchange effect. As the volume of the pipe decreases, the flow rate gradually increases, which helps to reduce the retention time of the fluid in the pipe, which is close to the standard temperature after the initial heat exchange, and reduces energy loss, and reduces the degree of fluid heat exchange exceeding the standard, thereby improving the uniformity and stability of heat exchange; 2. When in use, a reflux component is provided, and the temperature of the fluid is monitored in real time through an external liquid temperature detector, and the fluid that does not reach the standard temperature is collected in a transfer box for secondary heat exchange, so that the fluid that does not reach the standard temperature can be reintroduced into the heat exchange process for secondary heat exchange, thereby improving energy utilization. The valve box and liquid reflux pipe in the reflux component enable the fluid to flexibly switch between multiple heat exchange stages. When the fluid reaches a predetermined temperature in a valve box, the internal liquid temperature detector drives the control motor to rotate the rotating cover plate to cover the liquid opening to prevent the fluid from entering the next valve box, avoiding unnecessary heat exchange processes and saving energy and time. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 It is a schematic diagram of the circulation mechanism structure of the present invention; Figure 3 It is a schematic diagram of the structure of the heat conduction component of the present invention; Figure 4 It is a schematic diagram of the structure of the liquid discharge component of the present invention; Figure 5 It is a schematic diagram of the internal structure of the infusion pipeline of the present invention; Figure 6 It is a schematic diagram of the connection structure between the upper heat exchange tube and the lower heat exchange tube of the present invention; Figure 7 It is a schematic diagram of the structure of the reflux assembly of the present invention; Figure 8 It is a schematic diagram of the liquid transfer frame structure of the present invention.

[0015] In the figure: 1. outer shell; 2. liquid inlet; 3. liquid outlet; 4. outer fin; 5. side sealing plate; 6. supporting bottom plate; 7. interval sealing plate; 8. short sealing strip; 9. liquid partition sealing plate; 10. installation groove; 11. reflux outlet pipe; 12. connecting liquid pipe; 13. lower heat exchange tube; 14. inclined slope plate; 15. upper heat exchange tube; 16. external liquid temperature detector; 17. liquid transfer box; 18. small motor; 19. internal liquid temperature detector; 20. liquid outlet pipeline; 21. liquid pipe plugging cover; 22. side connecting plate; 23. connecting spring; 24. movable drain pipe; 25. liquid outlet side port; 26. installation notch; 27. control motor; 28. rotating cover plate; 29. ​​liquid passage opening; 30. transfer box; 31. liquid transfer frame; 32. liquid flow opening; 33. valve box; 34. liquid reflux pipe. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0017] Example 1: Please refer to Figure 1-Figure 8A plate-fin heat exchanger comprises: an outer shell 1, a liquid inlet 2 and a liquid outlet 3 are respectively provided on both sides of the outer shell 1, a supporting bottom plate 6 is provided on the bottom surface of the outer shell 1, a circulation mechanism is provided at the center of the outer shell 1, the circulation mechanism comprises a plurality of heat-conducting components stacked up and down, a group of heat-conducting components consists of two ventilation components and a liquid flow component, two side sealing plates 5 and two liquid-isolating sealing plates 9 are provided between the two ventilation components, the liquid flow component is located between the two side sealing plates 5 and the two liquid-isolating sealing plates 9, the ventilation component comprises: two spacing sealing plates 7, an outer fin 4 is provided between the two spacing sealing plates 7, a short sealing strip 8 is provided on both sides of the outer fin 4, the liquid flow component is arranged between the two ventilation components, the liquid flow component comprises: a plurality of lower heat exchange tubes 13 and an upper heat exchange tube 15, the lower heat exchange tube 13 is arranged on the upper side of the ventilation component located below The upper heat exchange tube 15 is arranged on the bottom surface of the ventilation component located above, and the upper heat exchange tube 15 is connected to the lower heat exchange tube 13 through the connecting liquid tube 12. The closer the upper heat exchange tube 15 and the lower heat exchange tube 13 are to the liquid outlet 3, the lower the liquid storage capacity inside. The side surface of the upper heat exchange tube 15 closest to the liquid outlet 3 is provided with an external liquid temperature detector 16. A liquid transfer box 17 is also provided at one end of the upper heat exchange tube 15. A small motor 18 is provided on the side surface of the liquid transfer box 17. A liquid transfer frame 31 is provided inside the liquid transfer box 17. Liquid flow openings 32 are provided on both side surfaces and the bottom surface of the liquid transfer frame 31. The three liquid flow openings 32 are connected to each other. The output shaft end of the small motor 18 is connected to one end of the liquid transfer frame 31. A transfer box 30 is provided on the bottom surface of the liquid transfer box 17, and the transfer box 30 is connected to the inside of the liquid transfer box 17. When in use, the staff first allows the fluid to be heated or cooled to enter the outer shell 1 from the liquid inlet 2. When entering, the liquid will enter the interior of the lower heat exchange tube 13 and circulate inside it. When the fluid flows in the lower heat exchange tube 13, the heat is transferred to the spacer sealing plate 7 and the outer fin 4 in contact with it through the tube wall. The outer fin 4 greatly improves the heat exchange efficiency with the surrounding air due to its expanded surface area. At the same time, the upper heat exchange tube 15 located below the upper ventilation component also performs the same heat exchange. The lower heat exchange tube 13 is connected to the upper heat exchange tube 15 by the connecting liquid pipe 12. When the liquid flows, it gradually flows between the lower heat exchange tube 13 and the upper heat exchange tube 15 along the connecting liquid pipe 12. When the fluid flows between multiple lower heat exchange tubes 13 and the upper heat exchange tube 15, it continuously absorbs or releases heat, so that the temperature of the fluid gradually changes when it flows in the heat conduction component, and because the upper heat exchange tube 15 and the lower heat exchange tube 15 are closer to the liquid outlet 3, the heat exchange between the upper heat exchange tube 15 and the lower heat exchange tube 15 is closer to the liquid outlet 3. The smaller the heat pipe 13 is, the lower the internal liquid storage capacity is. During the circulation of liquid, when passing through the upper heat exchange tube 15 and the lower heat exchange tube 13 that enter first, because the internal liquid storage capacity is large, the liquid will stay longer inside when passing through, and can be more effectively affected by the heat exchange effect of the upper and lower ventilation components. As the liquid flows, when the liquid circulates to the upper heat exchange tube 15 and the lower heat exchange tube 13 close to the liquid outlet 3, because the internal liquid storage capacity becomes smaller, under the condition that the liquid pressure remains unchanged, the speed at which the liquid passes through the upper heat exchange tube 15 and the lower heat exchange tube 13 becomes faster, and finally the liquid is discharged from the liquid outlet 3. When the liquid passes through the upper heat exchange tube 15 closest to the liquid outlet 3, the liquid will be detected by the external liquid temperature detector 16 to determine whether the temperature of the liquid reaches the expected temperature. When the temperature is not enough, the liquid is introduced into the reflux component for secondary heat exchange.

[0018] The liquid flow component also includes a reflux component, which includes: a plurality of valve boxes 33, the plurality of valve boxes 33 are all arranged on the upper surface of the ventilation component located below, a liquid reflux pipe 34 is arranged between every two valve boxes 33, one end of the liquid reflux pipe 34 is connected to the bottom surface of the transfer box 30, the bottom surface of the transfer box 30 is provided with a connecting port that matches the liquid reflux pipe 34, and two inclined ramps 14 are also arranged on the upper surface of the ventilation component located below, the upper surface of the spacer sealing plate 7 is provided with a mounting groove 10 for installing the inclined ramp 14, the upper surface of the inclined ramp 14 is provided with a reflux liquid outlet pipe 11, the side surface of the valve box 33 is provided with a liquid outlet pipe 20, the other end of the liquid outlet pipe 20 is connected to the reflux liquid outlet pipe 11, and the reflux liquid outlet pipe 1 One end of the valve housing 33 is connected with the liquid outlet 3, one end of the liquid outlet pipe 20 is provided with a liquid pipe plugging cover 21, the interior of the liquid outlet pipe 20 is provided with a movable liquid discharge pipe 24, the surface of the movable liquid discharge pipe 24 is provided with a plurality of leakage holes, the surfaces of the liquid pipe plugging cover 21 and the liquid outlet pipe 20 are provided with side connecting pieces 22 that cooperate with each other, a connecting spring 23 is provided between two corresponding side connecting pieces 22, liquid outlet side ports 25 are provided on both side surfaces of the valve housing 33, an internal liquid temperature detector 19 is provided on the inner side surface of the valve housing 33, a liquid-passing opening 29 is further provided on the surface of the liquid outlet side port 25, a mounting notch 26 is provided at the center of the liquid outlet side port 25, a control motor 27 is provided inside the mounting notch 26, and a rotating cover plate 28 is provided at the end of the output shaft of the control motor 27; After the fluid has undergone heat exchange with the lower heat exchange tube 13 and the upper heat exchange tube 15, it enters the liquid transfer box 17. If the temperature meets the standard, it directly enters the liquid outlet 3 and is discharged from the equipment. When the liquid is detected by the external liquid temperature detector 16 as not reaching the standard temperature, the external liquid temperature detector 16 sends a signal to drive the small motor 18 to rotate, driving the liquid transfer frame 31 to rotate ninety degrees, so that the liquid is collected in the transfer box 30. The transfer box 30 is connected to the liquid return pipe 34 through the connection port opened on its bottom surface. The middle section of the liquid return pipe 34 is provided with a plurality of valve boxes 33. When the liquid enters the plurality of valve boxes 33 in turn, it undergoes secondary heat exchange with the liquid inside the valve box 33 through the ventilation components below. Whenever the liquid enters a valve box 33, the internal liquid temperature detector 19 inside it will detect it. When the temperature reaches the standard, the internal liquid temperature detector 19 drives the control motor 27 at the outlet end of the valve box 33 where the current liquid stays to rotate, so that the rotating cover plate 28 covers the liquid opening 29, so that the liquid will not enter the next valve box 33. After the liquid gradually accumulates inside a valve box 33 and enters the liquid outlet pipe 20, the liquid pipe plugging cover 21 is moved forward by the hydraulic pressure, so that the movable drain pipe 24 and the leakage port are exposed, and the liquid inside the valve box 33 enters the reflux outlet pipe 11 from the liquid outlet side port 25, and is introduced into the liquid outlet 3 by the reflux outlet pipe 11 to discharge the device.

[0019] The working principle of the present invention is: When in use, the staff first allows the fluid to be heated or cooled to enter the outer shell 1 from the liquid inlet 2. When entering, the liquid will enter the interior of the lower heat exchange tube 13 and circulate inside it. When the fluid flows in the lower heat exchange tube 13, the heat is transferred to the spacer sealing plate 7 and the outer fin 4 in contact with it through the tube wall. The outer fin 4 greatly improves the heat exchange efficiency with the surrounding air due to its expanded surface area. At the same time, the upper heat exchange tube 15 located below the upper ventilation component also performs the same heat exchange. The lower heat exchange tube 13 is connected to the upper heat exchange tube 15 by the connecting liquid pipe 12. When the liquid flows, it gradually flows between the lower heat exchange tube 13 and the upper heat exchange tube 15 along the connecting liquid pipe 12. When the fluid flows between multiple lower heat exchange tubes 13 and the upper heat exchange tube 15, it continuously absorbs or releases heat, so that when the fluid flows in the heat conduction component, its temperature gradually changes, and because the upper heat exchange tube 15 and the lower heat exchange tube 15 closer to the liquid outlet 3 are closer, the heat exchange between the upper heat exchange tube 15 and the lower heat exchange tube 15 is closer. The smaller the heat pipe 13 is, the lower the internal liquid storage capacity is. During the circulation of liquid, when passing through the upper heat exchange tube 15 and the lower heat exchange tube 13 that enter first, because the internal liquid storage capacity is large, the liquid will stay longer inside when passing through, and can be more effectively affected by the heat exchange effect of the upper and lower ventilation components. As the liquid flows, when the liquid circulates to the upper heat exchange tube 15 and the lower heat exchange tube 13 close to the liquid outlet 3, because the internal liquid storage capacity becomes smaller, under the condition that the liquid pressure remains unchanged, the speed at which the liquid passes through the upper heat exchange tube 15 and the lower heat exchange tube 13 becomes faster, and finally the liquid is discharged from the liquid outlet 3. When the liquid passes through the upper heat exchange tube 15 closest to the liquid outlet 3, the liquid is detected by the external liquid temperature detector 16 to determine whether the temperature of the liquid reaches the expected temperature. When the temperature is not enough, the liquid is introduced into the reflux component for secondary heat exchange. After the fluid has undergone heat exchange with the lower heat exchange tube 13 and the upper heat exchange tube 15, it enters the liquid transfer box 17. If the temperature meets the standard, it directly enters the liquid outlet 3 and is discharged from the equipment. When the liquid is detected by the external liquid temperature detector 16 as not reaching the standard temperature, the external liquid temperature detector 16 sends a signal to drive the small motor 18 to rotate, driving the liquid transfer frame 31 to rotate ninety degrees, so that the liquid is collected in the transfer box 30. The transfer box 30 is connected to the liquid return pipe 34 through the connection port opened on its bottom surface. The middle section of the liquid return pipe 34 is provided with a plurality of valve boxes 33. When the liquid enters the plurality of valve boxes 33 in turn, the liquid is subjected to secondary heat exchange with the liquid inside the valve box 33 through the ventilation components below. Exchange, and every time the liquid enters a valve box 33, the internal liquid temperature detector 19 inside it will detect it. When the temperature reaches the standard, the internal liquid temperature detector 19 drives the control motor 27 at the outlet end of the valve box 33 where the current liquid stays to rotate, so that the rotating cover plate 28 covers the liquid opening 29, so that the liquid will not enter the next valve box 33. After the liquid gradually accumulates inside a valve box 33 and enters the liquid outlet pipe 20, the liquid pipe plugging cover 21 is moved forward by the hydraulic pressure, so that the movable drain pipe 24 and the leak are exposed, and the liquid inside the valve box 33 enters the reflux outlet pipe 11 from the leak, and is introduced into the liquid outlet 3 by the reflux outlet pipe 11 to discharge the device.

[0020] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A plate-fin heat exchanger, characterized in that: include: An outer shell (1), wherein two sides of the outer shell (1) are respectively provided with a liquid inlet (2) and a liquid outlet (3), a bottom surface of the outer shell (1) is provided with a supporting bottom plate (6), and a circulation mechanism is provided at the center of the outer shell (1); The circulation mechanism comprises a plurality of heat-conducting components stacked up and down, a group of heat-conducting components comprises two ventilation components and a liquid flow component, two side sealing plates (5) are arranged between the two ventilation components, the ventilation components comprise: two spacing sealing plates (7), an outer fin (4) is arranged between the two spacing sealing plates (7), a short sealing strip (8) is arranged on both sides of the outer fin (4), the liquid flow component is arranged between the two ventilation components, the liquid flow component comprises: a plurality of lower heat exchange tubes (13) and upper heat exchange tubes (15), the lower heat exchange tubes (13) are arranged on the upper surface of the ventilation component located below, the upper heat exchange tubes (15) are arranged on the bottom surface of the ventilation component located above, the upper heat exchange tubes (15) and the lower heat exchange tubes (13) are connected through a connecting liquid tube (12), and the liquid storage capacity inside the upper heat exchange tubes (15) and the lower heat exchange tubes (13) closer to the liquid outlet (3) is lower.

2. A plate-fin heat exchanger according to claim 1, characterized in that: An external liquid temperature detector (16) is provided on the side surface of the upper heat exchange tube (15) closest to the liquid outlet (3), and a liquid transfer box (17) is also provided at one end of the upper heat exchange tube (15). A small motor (18) is provided on the side surface of the liquid transfer box (17), and a liquid transfer frame (31) is provided inside the liquid transfer box (17).

3. A plate-fin heat exchanger according to claim 2, characterized in that: The two side surfaces and the bottom surface of the liquid transfer frame (31) are provided with liquid flow openings (32), and the three liquid flow openings (32) are interconnected. The output shaft end of the small motor (18) is connected to one end of the liquid transfer frame (31). The bottom surface of the liquid transfer box (17) is provided with a transfer box (30), and the transfer box (30) is connected to the inside of the liquid transfer box (17).

4. The plate-fin heat exchanger according to claim 1, characterized in that: The liquid flow assembly also includes a reflux assembly, which includes: a plurality of valve boxes (33), the plurality of valve boxes (33) are arranged on the upper surface of the ventilation component located below, a liquid reflux pipe (34) is arranged between every two of the valve boxes (33), one end of the liquid reflux pipe (34) is connected to the bottom surface of the transfer box (30), and the bottom surface of the transfer box (30) is provided with a connection port that matches the liquid reflux pipe (34).

5. A plate-fin heat exchanger according to claim 4, characterized in that: Two inclined ramps (14) are also provided on the upper surface of the ventilation component located below, a reflux liquid outlet pipe (11) is provided on the upper surface of the inclined ramp (14), a liquid outlet pipe (20) is provided on the side surface of the valve box (33), the other end of the liquid outlet pipe (20) is connected to the reflux liquid outlet pipe (11), and one end of the reflux liquid outlet pipe (11) is connected to the liquid outlet (3).

6. A plate-fin heat exchanger according to claim 5, characterized in that: A liquid pipe plugging cover (21) is provided at one end of the liquid outlet pipe (20), a movable liquid discharge pipe (24) is provided inside the liquid outlet pipe (20), and a plurality of leakage openings are provided on the surface of the movable liquid discharge pipe (24).

7. A plate-fin heat exchanger according to claim 6, characterized in that: The surfaces of the liquid pipe plugging cover (21) and the liquid outlet pipe (20) are both provided with side connecting pieces (22) that cooperate with each other, a connecting spring (23) is provided between two corresponding side connecting pieces (22), and liquid outlet side ports (25) are provided on both side surfaces of the valve box (33).

8. A plate-fin heat exchanger according to claim 7, characterized in that: An internal liquid temperature detector (19) is disposed on the inner side surface of the valve housing (33); a liquid-passing opening (29) is also provided on the surface of the liquid outlet side port (25); a mounting notch (26) is disposed at the center of the liquid outlet side port (25); a control motor (27) is disposed inside the mounting notch (26); and a rotating cover plate (28) is disposed at the end of the output shaft of the control motor (27).

Images