Micro-channel plate-fin heat exchanger
By optimizing the structure and improving the processing technology of microchannel plate-fin heat exchangers, the problems of thermal resistance and dimensional flexibility of existing heat exchangers have been solved, achieving a more efficient heat exchange effect and reducing production and operating costs.
Patent Information
- Application Number
- CN202520633114.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-25
- Publication Date
- 2026-02-13
- Estimated Expiration
- 2035-03-25
AI Technical Summary
Existing plate-fin and microchannel heat exchangers suffer from issues such as poor soldering thermal resistance, missing soldering thermal resistance, and the thermal resistance of the brazing filler metal itself at the connection points. Furthermore, their product dimensions are not flexible enough to meet diverse needs, resulting in high costs and difficulty in achieving efficient heat exchange.
The microchannel plate-fin heat exchanger adopts a heat exchange core composed of one-piece molded single-sided fins and independent baffles. The fins and baffles are made of the same material and are arranged perpendicularly to each other. The hot and cold fluid channels are formed through secondary processing. Combined with bending and brazing technology, the processing technology is optimized to achieve flexible adjustment of product size and improve heat exchange efficiency.
It simplifies product manufacturing, makes sizes more flexible and mobile, and increases heat exchange efficiency. It reduces the thermal resistance at the connection between fins and baffles, adapts to the heat exchange needs of special environments, and reduces equipment and operating costs.
Smart Images
Figure CN223910098U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model application relates to the field of heat exchanger, and especially relates to plate-fin heat exchanger and micro-channel heat exchanger. BACKGROUND
[0002] The plate-fin heat exchanger and the micro-channel heat exchanger are generally used in petroleum, chemical industry, natural gas, pharmaceutical, air conditioning, automobile and other industries, and they have the advantages of compactness, lightness, high heat transfer efficiency and the like.
[0003] The plate-fin heat exchanger has a complex manufacturing process, is usually formed by stacking multiple materials such as a partition plate, a fin, a flow guide plate, a hot fluid passage side seal and a cold fluid passage side seal, and is formed into a heat exchange core body through brazing, and in the brazing process, there are problems of virtual welding thermal resistance, missing welding thermal resistance and brazing material self thermal resistance technical defects at the connection between the partition plate and the fin, which seriously affect the heat exchange efficiency of the plate-fin heat exchanger, and high-standard high-density fins are difficult to set due to the limitation of equipment processing capacity.
[0004] The manufacturing process of the micro-channel heat exchanger is relatively simple compared with the manufacturing process of the plate-fin heat exchanger, but there are also problems of virtual welding thermal resistance, missing welding thermal resistance and brazing material self thermal resistance technical defects at the connection between the flat tube and the fin, and the center size of two passages in the flat tube is generally above 2mm, even if it is broken through below 2mm, the cost is extremely high, and the width of the center size of the two fluid passages and the thickness size of the fin are one mold matched with one flat tube product, so the product size is poor in mobility and is difficult to adapt to the needs of modern social development. CONTENT OF THE UTILITY MODEL
[0005] The utility model application relates to the field of heat exchanger, and especially relates to plate-fin heat exchanger and micro-channel heat exchanger.
[0006] A micro-channel plate fin heat exchanger, mainly composed of heat exchange monomer and independent partition or flat plate fin to form a heat exchange core, the heat exchange monomer is a one-piece finned heat sink or plate material processed by secondary cutting and grooving, the one-piece finned heat sink has cold fluid channels, cold fluid channel side seals, base plates and cold fluid channel fins, the heat exchange monomer is formed by secondary processing of cutting and grooving the base plate, the heat exchange monomer is composed of a partition, hot fluid channel fins, cold fluid channel fins, hot fluid channels, cold fluid channels, hot fluid channel side seals and cold fluid channel side seals, and the main technical features are that the partition, hot fluid channel fins and cold fluid channel fins form a whole of the same material, the hot fluid channel fins or cold fluid channel fins are parallel to each other and perpendicular to the two sides of the partition, the hot fluid channel fins and cold fluid channel fins are cross-shaped, the smallest angle formed by the cross is between more than 30° and 90°, in order to make the cold and hot fluid channels have a turbulent flow pattern, the secondary processed cold and hot channel fins can be bent to make the fin feet of the hot fluid channel fins or the fin feet of the cold fluid channel fins parallel to each other, and the hot fluid channel fins or the cold fluid channel fins are inclined to the two sides of the partition. The series combination mode also forms a fluid guide channel on the cold fluid side seal. In the case of high-end special size customized products, the channels on both sides of the partition can be directly cut and grooved by plate material, but the material loss is large, and it is only suitable for high-end special size customized products.
[0007] The utility model application a kind of microchannel plate fin heat exchange device has the following positive technical effects:1, product simple, from the utility model content, we can see that the heat exchange core of a kind of microchannel plate fin heat exchange is composed of heat exchange monomer and independent partition or flat fin, and the heat exchange monomer is the whole of same material, so that the product assembly step and the manufacturing and processing cost of fin, cold and hot channel side seal and fin forming equipment cost are greatly reduced.2, product size is more flexible, in heat exchanger equipment y axis, x axis, hot fluid channel size and fin thickness size can be freely adjusted according to customer demand, known one-piece single fin radiating fin length can fully meet the needs of y axis various product size, since the width of single fin radiating fin is limited by one-piece forming equipment, when the size of x axis direction is greater than the limitation of existing one-piece forming equipment, we can adopt butt joint in x axis direction, since hot fluid channel cross section is usually small, we can set hot fluid under the condition of static pressure according to the cross-sectional area pressure formula, and the axial tension of hot fluid channel direction is obtained, plus the contact area of hot fluid side seal and fin height as sealing surface, and the independent partition or flat fin is added, so that the axial compression problem of hot fluid channel direction is completely solved. As for hot fluid channel size and fin thickness, we can change cutting and grooving tool to meet the requirements of different product size, through practice test, the center size of two hot fluid channels can easily reach 1mm or even lower through cutting and grooving process, and the equipment cost and equipment operation cost of the scheme are very low, which can greatly reduce the use amount of refrigerant in air conditioning application. Of course, in special field, electric spark or etching technology can achieve smaller channel cross-sectional area, but the manufacturing cost will increase greatly.3, product heat exchange efficiency is higher, mainly reflected in the partition and the fin of cold and hot channel is the whole of same material and the setting of cold and hot channel and fin, as known in the foregoing description, the partition and the fin of cold and hot fluid channel is the whole of same material, which means that the virtual welding, missing welding and brazing filler metal thermal resistance problem of the connection between the partition and the fin or microchannel flat tube and fin of the above plate fin heat exchanger will not exist, but in the implementation of the utility model, it is found that, by comparing the various combination embodiments of the utility model application, under the condition that the cold and hot fluid channel cross-sectional area and fin surface area and the number of cold and hot channel are all the same, solving part of virtual welding, missing welding and brazing filler metal thermal resistance is better than solving all the foregoing technical defects, and the heat exchange performance is more excellent.As for the cold and hot channels and fin arrangement, I think that the smaller the difference in heat exchange efficiency and fin surface area on both sides of the plate fin heat exchanger and microchannel heat exchanger is, the better the heat exchange effect is, but the fin processing size of the plate fin heat exchanger and the flat tube processing size of the microchannel heat exchanger are limited by the equipment, and cannot reach the standard fine channel and standard fin arrangement, the utility model discloses through the practice implementation, the center size of two hot fluid channels can easily reach about 1mm, plus the cold and hot channel fins and the partition plate are the same material as a whole, thereby greatly improving the heat exchange efficiency, so the application can better adapt to the heat exchange demand of special environment.
[0008] A microchannel plate fin heat exchanger is optimized in product structure and processing technology, so that the product is simpler to manufacture, the product size is more flexible and maneuverable, the heat exchange efficiency is higher, and a microchannel plate fin heat exchanger has outstanding substantial features and significant progress, and the positive effects are obvious. BRIEF DESCRIPTION OF DRAWINGS
[0009] Figure 1 It is a microchannel plate fin heat exchanger single flow channel combination series mode and partial expansion schematic diagram.
[0010] Figure 2 It is a microchannel plate fin heat exchanger double flow channel combination parallel mode and partial expansion schematic diagram.
[0011] In the figure: heat exchange monomer 1; partition plate 2; fin 3; flat fin 4; hot fluid channel side seal 5; cold fluid channel side seal 6; fluid guide channel 7; cover plate 8; bottom plate 9; guide cover plate 10; flow collector 11; flow distributor 12; hot fluid inlet 13; hot fluid outlet 14; cold fluid inlet 15; cold fluid outlet 16; hot fluid channel 17; cold fluid channel 18, independent partition plate 19, heat exchange monomer butt joint point 20. DETAILED DESCRIPTION
[0012] Figure 1 It is a microchannel plate fin heat exchanger single flow channel combination series mode and partial expansion diagram, such as Figure 1As shown in the figure, the heat exchange unit 1 is a single-sided finned heat sink formed by cutting and slotting a one-piece heat sink, forming a partition plate 2, a fin 3, a hot fluid passage 17, a hot fluid passage side seal 5, and a fluid guide passage 7. The partition plate 2, the fin 3 of the cold and hot passages, the hot fluid passage side seal 5, and the cold fluid passage side seal 6 on the heat exchange unit 1 belong to the same material as a whole. The fin 3 of the cold and hot passages is perpendicular to the partition plate 2. The fluid guide passage 7 is provided on the cold fluid passage side seal 6 on one side of the heat exchange unit 1 and the independent partition plate 19. The heat exchange unit 1 and the independent partition plate 19 are stacked in sequence. The heat exchange unit 1 and the adjacent heat exchange unit 1 have the same direction of the cold and hot passage openings. Until the design requirements are met, the cover plate 8, the bottom plate 9, and the flow guide cover plate 10 on both sides are finally brazed to form a complete micro-channel plate fin heat exchanger.
[0013] Figure 2 A micro-channel plate fin heat exchanger double-flow channel combination parallel mode and partial expansion schematic diagram is shown in FIG. 3. Figure 2 As shown in the figure, the heat exchange unit 1 is the same as the heat exchange unit 1 of Figure 1 . Here, the description is not repeated. The heat exchange unit 1 and the flat fin 4 are stacked in sequence. The heat exchange unit 1 and the adjacent heat exchange unit 1 have opposite directions of the cold and hot passage openings. Until the design requirements are met, the cover plate 8, the bottom plate 9, the header 11, and the flow divider 12 are finally brazed to form a complete micro-channel plate fin heat exchanger. In the case where the pressure, the height of the cold and hot passage fin 3, and other working conditions are allowed, the flat fin 4 can be cancelled. The contact between the hot fluid passage side seal 5 and the cold fluid passage side seal 6 of the upper and lower heat exchange units 1 is directly laser welded, argon arc welded, etc. This can reduce the investment in brazing equipment and site, adapt to customers with less order quantity, greatly increase the production flexibility of the product, and increase the product size limit in the x-axis direction by using the heat exchange unit 1 butt joint method when the size in the x-axis direction is limited by the one-piece forming equipment. The heat exchange unit butt joint point 20 is formed. It is also suitable for Figure 1 the embodiments.
[0014] The heat exchange principle is shown in FIG. 4. Figure 1As shown, the hot fluid enters the hot fluid channel 17 directly through the hot fluid inlet 13, flows through the hot fluid channel 17 of the first heat exchange unit 1, and enters the fluid guide channel 7 at the end of the heat exchange unit 1. The hot fluid then enters the second heat exchange unit 1, and so on, finally flowing out from the hot fluid outlet 14. The hot fluid is in close contact with the fins 3 of the hot fluid channel 17. The fins 3 transfer most of the heat to the baffle 2. Because the fins 3 and the baffle 2 are made of the same material, there is no thermal resistance from poor soldering, missing soldering, or the solder itself. Therefore, the fins 3 will transfer most of the heat to the baffle 2, and the baffle 2 will then transfer the heat to the fins of the cold fluid channel 18. 3. Finally, the fins 3 of the cold fluid channel 18 release heat to the cold fluid. Only a small portion of the heat is transferred to the independent partition 19 through the fins 3 of the hot fluid channel 17. This is because there are thermal resistances such as poor soldering, missing soldering, and the thermal resistance of the solder itself at the contact points between the independent partition 19 and the fins 3 on both sides. Finally, a small portion of the heat is transferred to the fins 3 of the cold fluid channel 18 by the independent partition 19. The fins 3 of the cold fluid channel 18 then release a small portion of the heat to the cold fluid. The cold fluid enters the cold fluid channel 18 through the cold fluid inlet 15, carrying away the heat released by the fins 3 of the cold fluid channel 18 and discharging it from the cold fluid outlet 15, thus realizing the heat exchange process.
[0015] The principle of heat exchange is as follows Figure 2 As shown, it is similar to Figure 1 There are differences; flow channel patterns can be divided into series and parallel patterns. Figure 2 The independent baffle 19 is replaced with a flat plate fin 4. The flat plate fin 4 has a three-stage heat transfer function and increases the overall strength of the heat exchanger. The hot fluid enters the distribution box 12 through the hot fluid inlet 13. After entering the distribution box 12, the hot fluid enters several hot fluid channels 17, which are in close contact with the fins 3 of the hot fluid channels 17. The hot fluid absorbs the heat of the hot fluid and transfers the heat to the baffle 2. The baffle 2 then transfers the heat to the fins 3 of the cold fluid channel 18. The fins 3 of the cold fluid channel 18 release heat to the cold fluid. After passing through several hot fluid channels 17, the hot fluid enters the collector box 11 and finally exits from the hot fluid outlet 14. The cold fluid enters the cold fluid channel 18 through the cold fluid inlet 15, carries away the heat released by the fins 3 of the cold fluid channel 18, and exits from the cold fluid outlet 16. This completes the heat exchange process. Of course, the flat plate fins 4 of the hot and cold fluid channels also absorb or release some heat. The heat exchange principle is obvious and does not need to be described in detail here.
[0016] Through the Figure 1 , Figure 2 The heat exchange performance of the combination is not difficult to see. Figure 1 Only some of the thermal resistance issues at the connection between partition 2 and fin 3, such as poor soldering thermal resistance, missing soldering thermal resistance, and the thermal resistance of the brazing itself, were resolved. Figure 2When the combination is used, the aforementioned technical defects will no longer exist. Logically, solving all of the aforementioned technical defects is better than solving only some. However, given the superior heat exchange performance of the combination mode in this application, the opposite is true. We can assume... Figure 1 , Figure 2 Given that the cross-sectional area of the hot and cold channels, the thickness of the fins 3, the length, width, and height of the heat exchange unit 1, and the number of hot and cold channels are all the same, regardless of Figure 2 How small does the cross-sectional area of the hot and cold channels become, according to Figure 1 The combination method will have an additional heat transfer path for the independent partition 19, so from the perspective of heat exchange performance, Figure 1 The combination mode is far superior to Figure 2 The combination of, and Figure 2 The combination mode has better maneuverability than Figure 1 .
[0017] Figure 1 , Figure 2 The middle fins can be further processed, such as openings or holes in the fins 3 of the hot and cold channels, or bending them with the fin peaks of the fins 3 of the hot and cold channels as the force points to create a certain turbulence function.
[0018] The combination of the figures described in this application does not represent the scope of protection of this application. Hot and cold channels, axial directions, and combination modes of the figures can be interchanged or combined.
Claims
1. A micro-channel plate fin heat exchanger comprising heat exchange cells, characterized by: The heat exchange unit is a single-sided finned heat sink or plate material integrally formed and processed by secondary cutting and slotting. The heat exchange unit is composed of a partition plate, hot fluid passage fins and cold fluid passage fins, and is an integral body of the same material. The fin feet of the hot fluid passage fins or the fin feet of the cold fluid passage fins are parallel to each other. The hot fluid passage fins or the cold fluid passage fins are perpendicular or inclined to the two sides of the partition plate. The fin feet of the hot fluid passage fins and the fin feet of the cold fluid passage fins are in a cross shape. The smallest angle formed by the cross is between greater than 30° and 90°.
2. A microchannel plate fin heat exchanger according to claim 1, wherein: The heat exchange units have the same opening direction of the cold and hot passages of adjacent heat exchange units, and independent partition plates are arranged between the two heat exchange units.
3. The microchannel plate fin heat exchanger according to claim 1, wherein: The heat exchange units have opposite opening directions of the cold and hot passages of adjacent heat exchange units, and flat fin plates are arranged between the two heat exchange units.
4. A microchannel plate fin heat exchanger according to claim 1, wherein: The heat exchange units have opposite opening directions of the cold and hot passages of adjacent heat exchange units, and no flat fin plate is arranged between the two heat exchange units.
5. A microchannel plate fin heat exchanger as claimed in claim 1, wherein: The heat exchange unit is provided with a heat exchange unit butt joint point in the X-axis direction.
6. A microchannel plate fin heat exchanger according to claim 1, wherein: The partition plate, the hot fluid passage fins, the cold fluid passage fins, the hot fluid passage side seal and the cold fluid passage side seal form an integral body of the same material.
7. A microchannel plate fin heat exchanger according to claim 6, wherein: The hot fluid passage side seal or the cold fluid passage side seal and the independent partition plate are provided with fluid guide passages.