Split-flow plate-fin heat exchanger

Abstract

The present disclosure relates to a kind of split type plate-fin heat exchanger, including heat exchanger body, first heat exchange fin, first reversing fin and second heat exchange fin, the inside of heat exchanger body is formed with closed heat exchange cavity, first reversing fin is connected between first heat exchange fin and second heat exchange fin, and first heat exchange fin, first reversing fin and second heat exchange fin are all arranged in heat exchange cavity;The inside of first heat exchange fin has first heat exchange flow path, the inside of first reversing fin has first reversing flow path, the inside of second heat exchange fin has second heat exchange flow path, first heat exchange flow path and second heat exchange flow path are communicated by first reversing flow path, and the extension direction of first reversing flow path is different from the extension direction of first heat exchange flow path and the extension direction of second heat exchange flow path.The above scheme can make fluid occur orderly, return flow, cross flow and other irregular flow, to improve the turbulent degree of fluid, reach the purpose of improving heat exchange effect.

Description

Technical Field

[0001] This disclosure relates to the field of heat exchanger technology, and more specifically, to a split-flow plate-fin heat exchanger. Background Technology

[0002] The split-flow plate-fin heat exchanger is a compact, indirect heat exchanger with high heat transfer efficiency, and is widely used in industries such as air separation, petrochemicals, refrigeration, power machinery, and superconductivity.

[0003] Currently, the heat exchange fins of the known split-flow plate-fin heat exchangers are classified into four types: straight fins, porous fins, serrated fins, and corrugated fins. Although different fin structures have a positive effect on improving heat exchange efficiency, the heat exchange fin structure is often the same from beginning to end. The monotonous structure leads to insufficient turbulence in the fluid flow process, which will affect the heat exchange efficiency and heat exchange effect of the heat exchanger. Summary of the Invention

[0004] The purpose of this disclosure is to provide a split-flow plate-fin heat exchanger to solve the technical problems existing in the related art.

[0005] To achieve the above objectives, this disclosure provides a flow-diverting plate-fin heat exchanger, including a heat exchanger body, a first heat exchange fin, a first reversing fin, and a second heat exchange fin. The heat exchanger body has a closed heat exchange cavity inside. The first reversing fin is connected between the first heat exchange fin and the second heat exchange fin, and the first heat exchange fin, the first reversing fin, and the second heat exchange fin are all disposed within the heat exchange cavity. The first heat exchange fin has a first heat exchange flow path inside, the first reversing fin has a first reversing flow path inside, and the second heat exchange fin has a second heat exchange flow path inside. The first heat exchange flow path and the second heat exchange flow path are connected through the first reversing flow path, and the extension direction of the first reversing flow path is not the same as the extension direction of the first heat exchange flow path and the extension direction of the second heat exchange flow path.

[0006] Optionally, the split-flow plate-fin heat exchanger further includes multiple baffles, which are spaced apart in the heat exchange cavity along the vertical direction and are used to divide the heat exchange cavity into multiple first flow channels. The first heat exchange fins, the first reversing fins, and the second heat exchange fins are all disposed in the first flow channels. The first reversing fin includes a first connecting plate and two opposing first side plates. The first connecting plate is connected between the two first side plates. The side of the first connecting plate facing away from the first side plate is connected to one of the two adjacent partitions. The side of the first side plate facing away from the first connecting plate is connected to the other of the two adjacent partitions. Each first side plate is provided with a plurality of first through holes extending along its own thickness direction.

[0007] Optionally, each of the first side plates has a plurality of toothed notches at the end opposite to the first connecting plate.

[0008] Optionally, the first reversing fin is arranged perpendicularly to the second heat exchange fin.

[0009] Optionally, the split-flow plate-fin heat exchanger further includes a plurality of second reversing fins. The second reversing fins have a second reversing flow path inside. The first heat exchange fins include a plurality of interconnected first heat exchange sections. The second heat exchange fins include a plurality of interconnected second heat exchange sections. The second reversing fins are provided between two adjacent first heat exchange sections and between two adjacent second heat exchange sections. The extension direction of the second reversing flow path is not in the same direction as the extension direction of the first heat exchange flow path and the extension direction of the second heat exchange flow path.

[0010] Optionally, the second reversing fin includes a second connecting plate and two opposing second side plates. The second connecting plate is connected between the two second side plates. The side of the second connecting plate facing away from the second side plate or the side of the second side plate facing away from the second connecting plate is connected to the partition. Each second side plate is provided with a plurality of second through holes extending along its own thickness direction.

[0011] Optionally, the dimension of the second commutation fin between two adjacent partitions is smaller than the spacing between two adjacent partitions.

[0012] Optionally, each of the partitions is provided with a plurality of second reversing fins, and the second reversing fins provided on two adjacent partitions are staggered.

[0013] Optionally, the width of the first reversing flow path and the width of the second reversing flow path are both smaller than the width of the second heat exchange flow path, or the width of the first reversing flow path and the width of the second reversing flow path are both smaller than the width of the second heat exchange flow path.

[0014] Optionally, the split-flow plate-fin heat exchanger further includes a third heat exchange fin, which has a third heat exchange flow path inside. The third heat exchange fin is connected to the side of the second heat exchange fin away from the first heat exchange fin, and the third heat exchange fin and the first heat exchange fin are symmetrically arranged about the second heat exchange fin.

[0015] Through the above technical solution, the first heat exchange flow path and the second heat exchange flow path are connected through the first reversing flow path, and the extension direction of the first reversing flow path is not the same as the extension direction of both the first and second heat exchange flow paths. Thus, during the process of fluid flowing from the first heat exchange flow path through the first reversing flow path into the second heat exchange flow path, under the action of the first reversing flow path, the flow direction of the fluid first changes from the extension direction of the first heat exchange path to the flow direction of the first reversing flow path, that is, the flow direction of the fluid undergoes a first change. Subsequently, the fluid flowing out of the first reversing flow path re-enters the second heat exchange flow path, which is in a different direction from the first reversing flow path, and flows along the extension direction of the second heat exchange flow path, causing the flow direction of the fluid to change a second time. In the above process, it is precisely because the fluid undergoes multiple changes of direction during the flow process that the normal flow of the fluid can be disturbed, causing the fluid to undergo various irregular flows such as co-current, backflow, and crossflow, thereby increasing the turbulence of the fluid and achieving the purpose of improving the heat exchange effect.

[0016] Other features and advantages of this disclosure will be described in detail in the following detailed description section. Attached Figure Description

[0017] The accompanying drawings are provided to further illustrate the present disclosure and form part of the specification. They are used together with the following detailed description to explain the present disclosure, but do not constitute a limitation thereof. In the drawings: Figure 1 This is a partial top cross-sectional view of a split-flow plate-fin heat exchanger provided in an exemplary embodiment of this disclosure; Figure 2 This is a side cross-sectional view of a split-flow plate-fin heat exchanger provided in an exemplary embodiment of this disclosure; Figure 3 This is a partial lateral cross-sectional view from another angle of a diversion plate-fin heat exchanger provided in an exemplary embodiment of this disclosure; and shows the flow path of the fluid; Figure 4 This is a perspective view of the first commutation fin of a split-flow plate-fin heat exchanger provided in an exemplary embodiment of this disclosure. Figure 5 This is a perspective view of the second commutation fin of a split-flow plate-fin heat exchanger provided in an exemplary embodiment of this disclosure.

[0018] Explanation of reference numerals in the attached figures 1-Diverter plate-fin heat exchanger; 10-First heat exchange fin; 11-First heat exchange flow path; 12-First heat exchange section; 20-First reversing fin; 21-First reversing flow path; 22-First connecting plate; 23-First side plate; 230-First through hole; 231-Groove notch; 30-Second heat exchange fin; 31-Second heat exchange flow path; 32-Second heat exchange section; 40-Baffle plate; 50-Bratter layer; 70-Second reversing fin; 71-Second reversing flow path; 72-Second connecting plate; 73-Second side plate; 730-Second through hole; 80-Third heat exchange fin; 81-Third heat exchange flow path. Detailed Implementation

[0019] The specific embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this disclosure.

[0020] In this disclosure, unless otherwise stated, directional terms such as "up," "down," "left," and "right" are used to indicate orientation or positional relationships only for the convenience of describing this disclosure and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or a specific orientation structure and operation, and therefore should not be construed as a limitation of this disclosure. The terms "inner" and "outer" refer to the inner and outer contours of the corresponding structures.

[0021] Additionally, for "up and down direction", please refer to [link / reference]. Figure 3 The vertical direction is shown. Additionally, it should be noted that terms such as "first" and "second" are used to distinguish one element from another and do not indicate sequence or importance. Furthermore, in the description referring to the accompanying drawings, the same reference numerals in different drawings denote the same element.

[0022] In the description of this disclosure, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "connect," "link," and "install" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances.

[0023] refer to Figures 1 to 5As shown, this disclosure provides a flow-diverting plate-fin heat exchanger 1, including a heat exchanger body, a first heat exchange fin 10, a first reversing fin 20, and a second heat exchange fin 30. The heat exchanger body has a closed heat exchange cavity inside. The first reversing fin 20 is connected between the first heat exchange fin 10 and the second heat exchange fin 30, and the first heat exchange fin 10, the first reversing fin 20, and the second heat exchange fin 30 are all disposed in the heat exchange cavity. The first heat exchange fin 10 has a first heat exchange flow path 11 inside, the first reversing fin 20 has a first reversing flow path 21 inside, and the second heat exchange fin 30 has a second heat exchange flow path 31 inside. The first heat exchange flow path 11 and the second heat exchange flow path 31 are connected through the first reversing flow path 21, and the extension direction of the first reversing flow path 21 is not the same as the extension direction of the first heat exchange flow path 11 and the extension direction of the second heat exchange flow path 31.

[0024] Through the above technical solution, the first heat exchange path 11 and the second heat exchange path 31 are connected by the first reversing flow path 21, and the extension direction of the first reversing flow path 21 is not the same as the extension direction of the first heat exchange path 11 and the extension direction of the second heat exchange path 31. Thus, during the process of fluid flowing from the first heat exchange path 11 through the first reversing flow path 21 into the second heat exchange path 31, under the action of the first reversing flow path 21, the flow direction of the fluid first changes from the extension direction of the first heat exchange path to the flow direction of the first reversing flow path 21, that is, the flow... The flow direction of the fluid changes for the first time. Subsequently, the fluid flowing out of the first reversing flow path 21 re-enters the second heat exchange flow path 31, which is in a different direction from the first reversing flow path 21, and flows along the extension direction of the second heat exchange flow path 31, causing the flow direction of the fluid to change for the second time. In the above process, it is precisely because the fluid changes direction multiple times during the flow process that the normal flow of the fluid can be disturbed, causing the fluid to undergo various irregular flows such as downstream flow, backflow, and crossflow, thereby increasing the turbulence of the fluid and achieving the purpose of improving the heat exchange effect.

[0025] It should be noted that this disclosure does not limit the specific shape or switching method of the first reversing fin 20, as long as it can change the flow direction of the fluid. For example, Figures 1 to 3As shown, in an exemplary embodiment provided in this disclosure, the split-flow plate-fin heat exchanger 1 may further include a plurality of baffles 40. The plurality of baffles 40 are spaced apart in the heat exchange cavity along the vertical direction and are used to divide the heat exchange cavity into a plurality of first flow channels. The first heat exchange fins 10, the first reversing fins 20 and the second heat exchange fins 30 are all disposed in the first flow channels. The first reversing fins 20 include a first connecting plate 22 and two opposing first side plates 23. The first connecting plate 22 is connected between the two first side plates 23. The side of the first connecting plate 22 facing away from the first side plate 23 is connected to one of the two adjacent baffles 40. The side of the first side plate 23 facing away from the first connecting plate 22 is connected to the other of the two adjacent baffles 40. Each first side plate 23 is provided with a plurality of first through holes 230 penetrating along its own thickness direction. In this way, as the fluid flows from the first heat exchange fin 10 to the first reversing fin 20, it first flows into the first reversing flow path 21 through the first through hole 230 on the first side plate 23 near the first heat exchange fin 10. After entering the first reversing flow path 21, the fluid is redistributed within the first reversing flow path 21, and then flows into the second heat exchange flow path 31 through the first through hole 230 on the first side plate 23 near the second heat exchange fin 30. This intensifies the turbulence of the fluid flowing into the second heat exchange flow path 31 and increases the residence time of the fluid in the first reversing flow path 21, thereby improving the heat exchange effect.

[0026] In one exemplary embodiment provided in this disclosure, such as Figure 1 As shown, the width W of the first commutation fin 20 is 1.5 to 2 times the width of the second heat exchange fin 30, and the thickness of the first commutation fin 20 is 1 to 1.5 times the thickness of the second heat exchange fin 30. This ensures that the first commutation fin 20 and the partition plate 40 have sufficient brazing area, ensuring the strength and stability of the first commutation fin 20 during operation, and preventing damage due to excessive fluid pressure.

[0027] In addition, such as Figures 1 to 3As shown, the split-flow plate-fin heat exchanger 1 also includes multiple baffles 40. These baffles 40 are spaced vertically within the heat exchange chamber and divide the chamber into multiple first flow channels. In an embodiment where the first heat exchange fins 10, the first reversing fins 20, and the second heat exchange fins 30 are all disposed within the first flow channels, each first flow channel is provided with the aforementioned first heat exchange fins 10, first reversing fins 20, and second heat exchange fins 30. Furthermore, the first heat exchange fins 10 in adjacent first flow channels are positioned relative to the baffles 40. The first reversing fin 20 in the adjacent first flow channel is arranged about the partition plate 40, and the second heat exchange fin 30 in the adjacent first flow channel is arranged about the partition plate 40. On the one hand, this makes the flow path and turbulence of the fluid flowing in each first flow channel more similar, thereby making the heat dissipation state of each first flow channel more balanced and improving the stability of the heat exchange process. On the other hand, the heat exchange fins, the first reversing fin 20 and the second heat exchange fin 30 arranged symmetrically about the partition plate 40 are also easier to process and assemble.

[0028] Alternatively, in other embodiments provided in this disclosure, the first commutation fin 20 may further include an intermediate plate connected between the two first side plates 23 and disposed opposite to the first connecting plate 22. The intermediate plate can improve the overall strength of the first commutation fin 20, thereby improving the stability and service life of the first commutation fin 20, as well as the pressure bearing capacity of the diversion plate-fin heat exchanger 1 in the height direction of the first commutation fin 20.

[0029] To further facilitate the flow of fluid from the first reversing fin 20 to the second heat exchange fin 30, such as Figure 4 As shown, each first side plate 23 has multiple toothed notches 231 at the end opposite to the first connecting plate 22. In this way, during the fluid flow process, a portion of the fluid can flow into the second heat exchange flow path 31 of the second heat exchange fin 30 through the first through hole 230 provided on the first side plate 23, while another portion of the fluid can flow into the second heat exchange flow path 31 through the multiple toothed notches 231. On the one hand, this increases the flow area of ​​the fluid and reduces the pressure drop caused by the fluid flowing through the first reversing fin 20. On the other hand, during the process of the fluid flowing through the toothed notches 231, the sidewalls of the toothed notches 231 can also puncture air bubbles in the fluid flowing through the notches.

[0030] In addition, since the aforementioned toothed notch 231 is located at the end of the first side plate 23 away from the first connecting plate 22, it is easier for the fluid to flow into or out of the first reversing flow path 21 and the second heat exchange flow path 31 when the shunt plate-fin heat exchanger 1 needs to be inspected, maintained or the fluid replaced.

[0031] In one exemplary embodiment provided in this disclosure, the sum of the projected area of ​​the toothed notch 231 along the thickness direction of the first side plate 23 and the projected area of ​​the plurality of first through holes 230 along the thickness direction of the first side plate 23 is 40% to 70% of the projected area of ​​the first side plate 23 in its own thickness direction.

[0032] To further enhance the flow capacity of the toothed notch 231, the tooth peak spacing is 0.1 to 0.3 times the height H of the first heat exchange fin 10.

[0033] In this disclosure, the angle between the first reversing fin 20 and the second heat exchange fin 30 is not limited, as long as the first reversing flow path 21 and the second heat exchange flow path 31 disposed within them are not in the same direction. In the embodiments provided in this disclosure, optionally, the first reversing fin 20 and the second heat exchange fin 30 are arranged perpendicularly. Since the first reversing fin 20 and the second heat exchange fin 30 are perpendicular, the fluid can undergo various irregular flows such as backflow and crossflow while passing through the first reversing fin 20, further increasing the degree of fluid turbulence.

[0034] In one exemplary embodiment provided in this disclosure, the included angle between the first heat exchange fin 10 and the second heat exchange fin 30 is in the range of 5° to 45°.

[0035] Optionally, to further increase the turbulence of the fluid, in one exemplary embodiment provided in this disclosure, such as... Figure 1As shown, the above-mentioned split-flow plate-fin heat exchanger 1 may further include a plurality of second reversing fins 70. The interior of the second reversing fins 70 has a second reversing flow path 71. The first heat exchange fins 10 include a plurality of interconnected first heat exchange sections 12. The second heat exchange fins 30 include a plurality of interconnected second heat exchange sections 32. A second reversing fin 70 is provided between two adjacent first heat exchange sections 12 and between two adjacent second heat exchange sections 32. The extension direction of the second reversing flow path 71 is not the same as the extension direction of the first heat exchange flow path 11 and the extension direction of the second heat exchange flow path 31. In other words, the aforementioned second reversing fins 70 are provided inside both the first heat exchange fin 10 and the second heat exchange fin 30. Thus, when the fluid flows through the adjacent first heat exchange section 12 of the first heat exchange fin 10, the fluid undergoes various irregular flows such as co-current, backflow, and crossflow under the action of the second reversing fins 70, thereby increasing the degree of turbulence in the flow process of the fluid within the first heat exchange fin 10. Similarly, when the fluid flows through the adjacent second heat exchange section 32 of the second heat exchange fin 30, the fluid undergoes various irregular flows such as co-current, backflow, and crossflow under the action of the second reversing fins 70, thereby increasing the degree of turbulence in the flow process of the fluid within the second heat exchange fin 30, further refining the fluid flow, increasing the effective contact area between the fluid and the first heat exchange fin 10 and the second heat exchange fin 30, and thus improving the heat exchange effect.

[0036] In this way, during the flow process, such as... Figure 1 As shown, the flow can be reversed twice via the first reversing fin 20 and the second reversing fin 70, and redistributed within the first reversing flow path 21 and the second reversing flow path 71, making the flow of fluid more chaotic and disordered, thereby improving the heat exchange effect.

[0037] Furthermore, for the second reversing fin 70 located between two connected first heat exchange sections 12 of the first heat exchange fin 10, the distance B between two adjacent second heat exchange fins 30 is 10 to 40 times the height h of the second reversing fin 70 itself. The lower limit of the above distance ensures sufficient flow area, and the upper limit of the distance ensures the effect of enhanced turbulence in the mixing process, which is beneficial to controlling the pressure drop of the fluid in the mixing process.

[0038] In one exemplary embodiment provided in this disclosure, such as Figure 1 As shown, the width W1 of the second commutation fin 70 is 0.5 to 1 times the width of the second heat exchange fin 30.

[0039] Optionally, such as Figure 5As shown, the second reversing fin 70 may include a second connecting plate 72 and two opposing second side plates 73. The second connecting plate 72 is connected between the two second side plates 73. The side of the second connecting plate 72 away from the second side plate 73 or the side of the second side plate 73 away from the second connecting plate 72 is connected to the partition plate 40. Each second side plate 73 is provided with a plurality of second through holes 730 extending along its own thickness direction. In this way, during the flow of fluid between two adjacent first heat exchange sections 12 or two adjacent second heat exchange sections 32, the fluid first flows into the second reversing flow path 71 through the second through hole 730 provided on a second side plate 73. After entering the second reversing flow path 71, the fluid is redistributed within the second reversing flow path 71, and then flows into the adjacent first heat exchange section 12 or two adjacent second heat exchange sections 32 through the second through hole 730 on another first side plate 23. This intensifies the turbulence of the fluid flowing into the second heat exchange flow path 31 and increases the residence time of the fluid in the first reversing flow path 21, thereby improving the heat exchange effect.

[0040] The sum of the projected areas of the plurality of second through holes 730 along the thickness direction of the second side plate 73 is 30% to 60% of the projected area of ​​the second side plate 73 along its own thickness direction.

[0041] Optionally, such as Figure 1 As shown, the dimension of the second commutation fin 70 between two adjacent partitions 40 is smaller than the spacing between two adjacent partitions 40. In other words, the length of the second reversing fin 70 is less than the distance between the two partitions 40. Thus, when the second reversing fin 70 is connected to one of the two adjacent partitions 40, the other end of the second reversing fin 70 is spaced apart from the other partition 40. This allows a portion of the fluid to flow through the gap between the second reversing fin 70 and the partition 40 into the adjacent first heat exchange section 12 or the adjacent second heat exchange section 32, while another portion of the fluid flows through the second through hole 730 into the adjacent first heat exchange section 12 or the two adjacent second heat exchange sections 32. On the one hand, the fluid flowing out of the second through hole 730 undergoes various irregular flows such as co-current, backflow, and crossflow under the action of the second reversing fin 70, thereby increasing the turbulence of the fluid during its flow within the first heat exchange fin 10. On the other hand, the fluid flowing out of the gap between the second reversing fin 70 and the partition 40 can also reduce the pressure drop during the fluid flow process.

[0042] In one exemplary embodiment provided in this disclosure, the size of the second commutator 70 between two adjacent partitions 40 is 0.2 to 0.6 times the distance between the two adjacent partitions 40. Within this range, it can ensure the obstruction and turbulence of the fluid without affecting the normal flow of the fluid and causing excessive fluid pressure drop.

[0043] Optionally, such as Figure 3 As shown, each baffle 40 is provided with multiple second reversing fins 70, and the second reversing fins 70 provided on two adjacent baffles 40 are staggered. Alternatively, it can be understood that two adjacent second heat exchange fins 30 can be connected to two adjacent baffles 40 respectively. In this way, as the fluid flows through the adjacent second heat exchange fins 30 in sequence, the separation and obstruction effect of the second heat exchange fins 30 causes a baffle effect, further increasing the fluid turbulence and improving the heat exchange effect.

[0044] To further enhance the flow deflection effect of fluid during its flow through multiple second heat exchange fins 30, the second through holes 730 formed on two adjacent second heat exchange fins 30 are staggered. As the fluid flows from one second through hole 730 into the other adjacent second through hole 730, the staggered arrangement of the two second through holes 730 makes the flow path of the fluid become curved or oblique, thereby increasing the flow path of the fluid between two adjacent second heat exchange fins 30. This, in turn, increases the residence time of the fluid in the diverter plate-fin heat exchanger 1, thus improving the heat exchange effect.

[0045] Furthermore, this disclosure does not limit the shape of the first through hole 230 and the second through hole 730. For example, the first through hole 230 and the second through hole 730 can be formed as circular holes, rectangular holes, or oblong holes.

[0046] Optionally, such as Figure 1 As shown, the widths of the first reversing flow path 21 and the second reversing flow path 71 are both smaller than the width of the first heat exchange flow path 11, or the widths of the first reversing flow path 21 and the second reversing flow path 71 are both smaller than the width of the second heat exchange flow path 31. On the one hand, this allows the fluid to be finely divided within the relatively narrow first reversing flow path 21 and the second reversing flow path 71, resulting in a faster flow velocity and greater turbulence. On the other hand, the wider first heat exchange flow path 11 or the wider second heat exchange flow path 31 also helps control the pressure drop of the fluid during the mixing process.

[0047] The aforementioned split-flow plate-fin heat exchanger 1 also includes a brazing layer 50, through which the first heat exchange fin 10, the first reversing fin 20, the second reversing fin 70, the second heat exchange fin 30, and the third heat exchange fin 80 are all connected to the partition plate 40.

[0048] Optionally, such as Figure 1As shown, the split-flow plate-fin heat exchanger 1 may further include a third heat exchange fin 80, which has a third heat exchange flow path 81 inside. The third heat exchange fin 80 is connected to the side of the second heat exchange fin 30 away from the first heat exchange fin 10, and the third heat exchange fin 80 and the first heat exchange fin 10 are symmetrically arranged with respect to the second heat exchange fin 30. On the one hand, the symmetrical arrangement of the first heat exchange fin 10 and the third heat exchange fin 80 with respect to the second heat exchange fin 30 makes the mass distribution of the first heat exchange fin 10 and the second heat exchange fin 30 more uniform. On the other hand, it also makes it easier to process and manufacture the first heat exchange fin 10 and the third heat exchange fin 80.

[0049] In one exemplary embodiment provided in this disclosure, such as Figure 1 As shown, the pitch p of the first heat exchange fin 10 and the pitch P of the third heat exchange fin 80 are twice the pitch P0 of the second heat exchange fin 30. The thickness of the first heat exchange fin 10 and the thickness of the third heat exchange fin 80 are both 1 to 1.5 times that of the second heat exchange fin 30. In this way, during the flow process, the fluid can flow through the first heat exchange fin 10 with a larger pitch to the second heat exchange fin 30 with a relatively smaller pitch, and then flow into the third heat exchange fin 80 with a larger pitch. This results in different flow velocities in the first heat exchange fin 10 (lower flow velocity), the second heat exchange fin 30 (higher flow velocity), and the third heat exchange fin 80 (lower flow velocity), further increasing the turbulence of the fluid in the split-flow plate-fin heat exchanger 1.

[0050] In one exemplary embodiment provided in this disclosure, such as Figure 1 As shown, the first heat exchange fin 10, the second heat exchange fin 30, the third heat exchange fin 80, and the second heat exchange fin 30 can be connected in sequence to form a heat exchange unit. The split-flow plate-fin heat exchanger 1 can include multiple heat exchange units, so that the fluid is constantly disturbed and disrupted during the flow in multiple heat exchange units, and various irregular flows such as cross flow, co-flow, and backflow occur, thereby increasing the degree of turbulence of the fluid during the flow in the heat exchange units and improving the heat exchange effect.

[0051] The preferred embodiments of this disclosure have been described in detail above with reference to the accompanying drawings. However, this disclosure is not limited to the specific details of the above embodiments. Within the scope of the technical concept of this disclosure, various simple modifications can be made to the technical solutions of this disclosure, and these simple modifications all fall within the protection scope of this disclosure. It should also be noted that the various specific technical features described in the above embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, this disclosure will not further describe the various possible combinations.

[0052] Furthermore, various different embodiments of this disclosure can be combined in any way, as long as they do not violate the spirit of this disclosure, they should also be regarded as the content disclosed in this disclosure.

Claims

1. A split-flow plate-fin heat exchanger, characterized in that, The heat exchanger includes a heat exchanger body, a first heat exchange fin, a first reversing fin, and a second heat exchange fin. The heat exchanger body has a closed heat exchange cavity inside. The first reversing fin is connected between the first heat exchange fin and the second heat exchange fin, and the first heat exchange fin, the first reversing fin, and the second heat exchange fin are all disposed inside the heat exchange cavity. The first heat exchange fin has a first heat exchange flow path inside, the first reversing fin has a first reversing flow path inside, and the second heat exchange fin has a second heat exchange flow path inside. The first heat exchange flow path and the second heat exchange flow path are connected through the first reversing flow path, and the extension direction of the first reversing flow path is not the same as the extension direction of the first heat exchange flow path and the extension direction of the second heat exchange flow path.

2. The split-flow plate-fin heat exchanger according to claim 1, characterized in that, The split-type plate-fin heat exchanger further includes multiple baffles, which are spaced apart in the heat exchange cavity along the vertical direction and are used to divide the heat exchange cavity into multiple first flow channels. The first heat exchange fins, the first reversing fins, and the second heat exchange fins are all disposed in the first flow channels. The first reversing fin includes a first connecting plate and two opposing first side plates. The first connecting plate is connected between the two first side plates. The side of the first connecting plate facing away from the first side plate is connected to one of the two adjacent partitions. The side of the first side plate facing away from the first connecting plate is connected to the other of the two adjacent partitions. Each first side plate is provided with a plurality of first through holes extending along its own thickness direction.

3. The split-flow plate-fin heat exchanger according to claim 2, characterized in that, Each of the first side plates has multiple toothed notches at the end opposite to the first connecting plate.

4. The split-flow plate-fin heat exchanger according to claim 1, characterized in that, The first reversing fin is arranged perpendicularly to the second heat exchange fin.

5. The split-flow plate-fin heat exchanger according to any one of claims 2-3, characterized in that, The split-flow plate-fin heat exchanger further includes a plurality of second reversing fins. The interior of the second reversing fins has a second reversing flow path. The first heat exchange fins include a plurality of interconnected first heat exchange sections. The second heat exchange fins include a plurality of interconnected second heat exchange sections. The second reversing fins are provided between two adjacent first heat exchange sections and between two adjacent second heat exchange sections. The extension direction of the second reversing flow path is not in the same direction as the extension direction of the first heat exchange flow path and the extension direction of the second heat exchange flow path.

6. The split-flow plate-fin heat exchanger according to claim 5, characterized in that, The second reversing fin includes a second connecting plate and two opposing second side plates. The second connecting plate is connected between the two second side plates. The side of the second connecting plate away from the second side plate or the side of the second side plate away from the second connecting plate is connected to the partition. Each second side plate is provided with a plurality of second through holes extending along its own thickness direction.

7. The split-flow plate-fin heat exchanger according to claim 6, characterized in that, The second commutation fin has a dimension between two adjacent partitions that is smaller than the spacing between two adjacent partitions.

8. The split-flow plate-fin heat exchanger according to claim 6, characterized in that, Each of the partitions is provided with a plurality of second reversing fins, and the second reversing fins provided on two adjacent partitions are staggered.

9. The split-flow plate-fin heat exchanger according to claim 5, characterized in that, The widths of the first reversing flow path and the second reversing flow path are both smaller than the width of the first heat exchange flow path; or, the widths of the first reversing flow path and the second reversing flow path are both smaller than the width of the second heat exchange flow path.

10. The split-flow plate-fin heat exchanger according to any one of claims 1-4, characterized in that, The split-flow plate-fin heat exchanger further includes a third heat exchange fin, which has a third heat exchange flow path inside. The third heat exchange fin is connected to the side of the second heat exchange fin away from the first heat exchange fin, and the third heat exchange fin and the first heat exchange fin are symmetrically arranged about the second heat exchange fin.

Images