A counter-current microchannel acid-resistant dew point tube bundle assembly

Abstract

This utility model discloses a counter-flow microchannel acid-resistant dew point tube bundle assembly, belonging to the field of microchannel radiator technology. It includes a first manifold and a second manifold, with flat tubes uniformly welded between them. The two ends of the flat tubes penetrate into the interiors of both manifolds, and fins are uniformly arranged between them. An inlet and outlet pipe are symmetrically installed on one side of the first manifold. A flow guide assembly is located in the middle of the second manifold. An isolation tube is fixed inside the first manifold at its upper end, and is connected to the inlet pipe. Openings are provided on both sides of the isolation tube. This utility model constructs a contracting flow field through the isolation tube and V-shaped plate, combined with a pressure compensation design using gradient through-holes in the fixed plate. This achieves uniform distribution of the cooling medium, improves flow distribution uniformity, stabilizes the uniform flow field to avoid localized heat exchange dead zones, prevents acid stagnation corrosion caused by uneven flow, and significantly extends the corrosion resistance life of the assembly.

Description

Technical Field

[0001] This utility model relates to a tube bundle assembly, and more particularly to a counter-flow microchannel acid-resistant dew point tube bundle assembly, belonging to the field of microchannel heat sink technology. Background Technology

[0002] Compared to traditional cooling methods, microchannel heat dissipation technology has become a research hotspot in both academia and industry due to its high area heat flux density, strong heat transport capability, and miniaturized integration advantages. Since the Tuckerman team proposed the concept of microchannel heat sinks in 1981, the technology has undergone iterative upgrades from basic cold plate structures to chip embedded designs. Currently, commonly used co-flow microchannels employ parallel straight channels or simple serpentine flow channel designs, with the cooling medium and high-temperature fluid flowing in the same direction, and the channel cross-sections are mostly rectangular or circular.

[0003] The counter-flow microchannel acid-resistant dew point tube bundle assembly is a heat exchange unit composed of multiple acid-resistant tubes with built-in microchannels arranged densely. The tubes are externally connected by a graded flow equalization and distribution structure and an acid liquid guiding and drainage system. The acid-containing fluid flows between the tubes, while the cooling medium flows within the microchannels. The two flow in opposite directions, utilizing the large specific surface area of ​​the microchannels to achieve efficient heat exchange. It is suitable for scenarios prone to acid dew point corrosion, such as power plant flue gas and chemical acidic media.

[0004] Current technologies still have shortcomings:

[0005] Existing counter-flow microchannel tube bundle assemblies mostly rely on manifolds and flat tubes to achieve fluid flow. Due to the small size and large number of flow channels, microchannels are prone to problems such as insufficient flow in edge channels and overload in the middle channels, resulting in local heat exchange temperature imbalance. In low flow areas, acidic condensate has a long residence time, and the acid concentration increases locally, accelerating tube wall corrosion and causing serious loss of heat exchange efficiency. This makes it difficult to meet the requirements of long-term stability and heat exchange uniformity in industrial scenarios.

[0006] To address this issue, a counter-current microchannel acid-resistant dew point tube bundle assembly was designed. Utility Model Content

[0007] The main objective of this invention is to provide a counter-current microchannel acid-resistant dew point tube bundle assembly to solve the problems mentioned in the background art.

[0008] The objective of this utility model can be achieved by adopting the following technical solution:

[0009] A counter-current microchannel acid-resistant dew point tube bundle assembly includes a manifold 1 and a manifold 2. Flat tubes are uniformly welded and installed between manifold 1 and manifold 2, and the two ends of the flat tubes penetrate into the interior of manifold 1 and manifold 2 respectively. Fins are uniformly arranged between the flat tubes.

[0010] One side of the manifold has an inlet pipe and an outlet pipe installed symmetrically. The middle of the manifold has a flow guide component. Inside the manifold and at the top, there is an isolation pipe that is fixed and connected to the inlet pipe. Both sides of the isolation pipe have openings. Inside the isolation pipe, there are V-shaped plates installed symmetrically. A fixing plate is fixed in the middle between the V-shaped plates. The fixing plate has through holes one, two, and three in sequence from the middle to both ends. Baffles are evenly fixed on the side of the fixing plate away from the inlet pipe, and the ends of the baffles are staggered from the inlet of the flat pipe.

[0011] Preferably, the flow guiding assembly includes a semi-circular plate and a mounting groove. The semi-circular plate is located in the middle of the inside of the second manifold and is close to the end of the flat pipe. The bottom of the semi-circular plate away from the flat pipe has a mounting groove. A flap is hinged inside the mounting groove. A side plate is fixed to the bottom of the semi-circular plate. A spring is provided between the bottom of the flap and one side of the side plate.

[0012] Preferably, protective pipes are fitted on the outer sides of both manifold 1 and manifold 2, and a honeycomb layer is provided between the protective pipes and the interlayer of manifold 1 and manifold 2.

[0013] Preferred: The V-shaped plate has a V-angle of 30°-60°, is made of titanium alloy, and the bends of the V-shaped plate are ground to form rounded corners.

[0014] Preferably, the diameters of through holes one, two, and three increase sequentially, and through holes one, two, and three are set at equal intervals.

[0015] Preferably, the inner top wall of the mounting groove is provided with a protective pad, and the flap is slidably connected to the inner side wall of the manifold 2.

[0016] Preferably, the inner walls of manifold 1 and manifold 2 are coated with a protective layer, and the protective layer is a fluorocarbon acid-resistant coating.

[0017] Compared with the prior art, the beneficial effects of this utility model are:

[0018] 1. This utility model utilizes the combined use of manifold 1, manifold 2, flat pipe, fins, isolation pipe, V-shaped plate, fixed plate, through hole 1, through hole 2, through hole 3, baffle, protective pipe, honeycomb layer, inlet pipe and outlet pipe. By constructing a contraction flow field through the isolation pipe and V-shaped plate, and with the pressure compensation design of the gradient through holes of the fixed plate, the cooling medium is evenly distributed, the flow distribution uniformity is improved, the stable uniform flow field avoids local heat exchange dead zones, avoids acid retention corrosion caused by uneven flow, and significantly extends the corrosion resistance life of the component.

[0019] 2. This utility model utilizes a combination of a semi-circular plate, mounting groove, flap, spring, and side plate. The flap and spring form a dynamic backstop mechanism, which adaptively adjusts the flap's swing angle to accommodate wide flow fluctuations. During backflow, the spring drives the flap to reset, physically blocking backflow, avoiding flow field turbulence, reducing flow velocity deviation in the manifold, and improving heat exchange efficiency. Attached Figure Description

[0020] Figure 1 This is a front sectional view of the present invention;

[0021] Figure 2 This is a cross-sectional view of the isolation tube of this utility model;

[0022] Figure 3 For the present utility model Figure 1 Enlarged view of the structure at point A in the middle;

[0023] Figure 4 This is a cross-sectional view of the manifold of this utility model.

[0024] In the diagram: 1. Manifold 1; 2. Manifold 2; 3. Flat pipe; 4. Fin; 5. Isolation pipe;

[0025] 6. Flow guiding assembly; 601. Semicircular plate; 602. Mounting groove; 603. Flip plate; 604. Spring; 605. Side plate;

[0026] 7. V-shaped plate; 8. Fixing plate; 9. Through hole one; 10. Through hole two; 11. Through hole three; 12. Baffle; 13. Protective tube; 14. Honeycomb layer; 15. Inlet tube; 16. Outlet tube. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model.

[0028] Therefore, the following detailed description of the embodiments of this utility model is not intended to limit the scope of the claimed utility model, but merely to illustrate some embodiments of the utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0029] It should be noted that, unless otherwise specified, the embodiments and features and technical solutions in the present invention can be combined with each other.

[0030] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0031] In the description of this utility model, it should be noted that the terms "upper," "lower," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use, or the orientation or positional relationship commonly understood by those skilled in the art. These terms are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this utility model. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0032] Example 1

[0033] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, this embodiment proposes a counter-current microchannel acid-resistant dew point tube bundle assembly, including a manifold 1 and a manifold 2. A flat tube 3 is uniformly welded and installed between the manifold 1 and the manifold 2, and both ends of the flat tube 3 penetrate into the interior of the manifold 1 and the manifold 2, respectively. Fins 4 are uniformly arranged between the flat tubes 3.

[0034] One side of the manifold 1 is symmetrically equipped with an inlet pipe 15 and an outlet pipe 16. The middle position of the manifold 2 is provided with a flow guide component 6. The upper end of the manifold 1 is fixed with an isolation pipe 5, which is connected to the inlet pipe 15. Both sides of the isolation pipe 5 are provided with openings. The inside of the isolation pipe 5 is symmetrically equipped with V-shaped plates 7. The middle position between the V-shaped plates 7 is fixed with a fixing plate 8. The fixing plate 8 is provided with through holes 1 9, 2 10 and 3 11 from the middle to both ends. The side of the fixing plate 8 away from the inlet pipe 15 is uniformly fixed with baffles 12, and the ends of the baffles 12 are staggered from the inlet of the flat pipe 3.

[0035] The cooling medium is transported to manifold 1 through inlet pipe 15. Within the isolation pipe 5, it is guided and constrained by V-shaped plate 7, forming a contracting flow field. The Venturi effect enhances the fluid's kinetic energy. When the fluid converges to one side of the fixed plate 8, the through holes 1-9, 2-10, and 3-11 on the plate exhibit a gradient distribution with smaller diameters in the middle and larger diameters at both ends. Due to the small diameter of the middle through hole 1-9, the amount of cooling medium entering is limited, prompting the cooling medium to diffuse towards the through holes 2-10 and 3-11, whose diameters increase at both ends. The cooling medium enters the interior of the flat pipe 3 uniformly, providing a uniform flow field basis for countercurrent heat exchange.

[0036] Example 2

[0037] The solution in Example 1 will be further described below with reference to its specific working method.

[0038] like Figure 1 and Figure 3 As shown, in a preferred embodiment, based on the above method, the flow guiding component 6 further includes a semi-circular plate 601 and a mounting groove 602. The semi-circular plate 601 is located in the middle of the inside of the manifold 2, and the semi-circular plate 601 is close to the end of the flat pipe 3. The mounting groove 602 is provided at the bottom of the end of the semi-circular plate 601 away from the flat pipe 3. A flap 603 is hingedly installed inside the mounting groove 602. A side plate 605 is fixed to the bottom of the semi-circular plate 601. A spring 604 is provided between the bottom of the flap 603 and one side of the side plate 605.

[0039] After the cooling medium flows into the upper part of the manifold 2 through the flat pipe 3, it descends longitudinally along the chamber. During the descent, the kinetic energy of the medium drives the flap 603 to rotate downward around the axis. The rotation angle is positively correlated with the medium flow velocity. When the flow velocity increases, the flap 603 is subjected to a stronger thrust, and the downward swing angle expands, reaching a maximum of 60°. When the flow velocity decreases, the downward swing angle of the flap 603 decreases accordingly, maintaining a minimum opening degree of 15°.

[0040] When the medium returns upward through the area below the flap 603 after heat exchange, the spring 604 releases its preload to generate an elastic restoring force, which drives the flap 603 to flip upward and reset, forming a physical barrier to the returning medium. This achieves the flow channel backflow prevention function and avoids flow field turbulence and heat exchange efficiency degradation caused by backflow.

[0041] like Figure 1 and Figure 4 As shown, in a preferred embodiment, based on the above method, a protective tube 13 is further provided on the outer side of both the first manifold 1 and the second manifold 2, and a honeycomb layer 14 is provided between the protective tube 13 and the interlayer between the first manifold 1 and the second manifold 2.

[0042] The protective pipe 13 provides protection for manifold 1 and manifold 2, reducing the risk of deformation caused by external impact; the honeycomb layer 14 fills the gaps, improves the overall rigidity of the component, and the staggered honeycomb structure can block acidic substances from directly entering the manifold, delaying the direct corrosion of the outer wall of the manifold by acid.

[0043] like Figure 1 and Figure 2 As shown, in a preferred embodiment, based on the above method, the V-shaped plate 7 has a V-angle of 30°-60°, is made of titanium alloy, and the bent part of the V-shaped plate 7 is polished to form a rounded corner.

[0044] Titanium alloy has excellent acid corrosion resistance, and the rounded corner design at the V-shaped bend reduces fluid resistance, making the flow of the cooling medium more stable.

[0045] like Figure 1 and Figure 2 As shown, in a preferred embodiment, based on the above method, the diameters of through holes 1-9, 2-10, and 3-11 increase sequentially, and through holes 1-9, 2-10, and 3-11 are arranged at equal intervals.

[0046] When the cooling medium enters through hole 19, the flow rate of the cooling medium slows down due to the small diameter of through hole 19, causing the cooling medium that has not entered through hole 19 to flow to through holes 20 and through holes 31 at both ends. The cooling medium can flow evenly into the multiple sets of flat tubes 3.

[0047] like Figure 3 As shown, in a preferred embodiment, based on the above method, a protective pad is further provided on the inner top wall of the mounting groove 602, and the flap 603 is slidably connected to the inner side wall of the manifold 2.

[0048] The protective pad is preferably made of polytetrafluoroethylene, which is acid-resistant and has low friction. The protective pad reduces the impact caused by the hard contact between the flap 603 and the manifold 2.

[0049] like Figure 1 As shown, in a preferred embodiment, based on the above method, the inner walls of manifold 1 and manifold 2 are further coated with a protective layer, and the protective layer is a fluorocarbon acid-resistant coating.

[0050] The fluorocarbon coating has an acid resistance temperature of -40℃ to 200℃ and can withstand 98% sulfuric acid and 30% hydrochloric acid, covering all working conditions of chemical acid dew point and improving the overall protection effect.

[0051] Example 3

[0052] The solutions in Embodiments 1 and 2 will be further described below with reference to their specific working methods.

[0053] The cooling medium enters the manifold 1 through the inlet pipe 15. Inside the isolation pipe 5, it is guided and constrained by the V-shaped plate 7, causing the cooling medium to converge towards the central fixed plate 8.

[0054] The converging fluid impacts the fixed plate 8. Because the diameters of the through holes 1-9, 2-10, and 3-11 on the fixed plate 8 increase sequentially, and the diameter of the middle through hole 1-9 is small, the amount of cooling medium entering is limited. The cooling medium blocked outside flows from the through holes 2-10 and 3-11 at both ends.

[0055] After gradient flow splitting, the cooling medium enters the interior of the flat tube 3 uniformly, providing a "uniform flow field basis" for subsequent counter-current heat exchange.

[0056] The cooling medium enters the flat tube 3 from the upper left inlet pipe 15 and flows through the lower flat tube 3 after being guided by the second manifold 2. It then flows back to the outlet pipe 16. The substance to be cooled enters from the lower left corner, flows to the right, flows upward and then flows out to the upper left corner through the internal guiding structure of the heat exchanger shell. When it flows through, it comes into contact with the outer fins 4 of the flat tube 3 to complete the heat exchange and forms a countercurrent with the cooling medium.

[0057] Furthermore, when the cooling medium flows downwards into the manifold 2, it drives the flap 603 to rotate around the axis. The rotation angle is positively correlated with the flow rate. The greater the flow rate, the greater the downward swing angle of the flap 603; the smaller the flow rate, the smaller the swing angle.

[0058] After the cooling medium completes heat exchange, it flows upward back through the area below the flap 603. The spring 604, in conjunction with the cooling medium, pushes upward, driving the flap 603 to flip upward and reset to a certain angle, reducing the upward flow speed of the cooling medium and avoiding "backflow disturbance" that could cause flow field turbulence.

[0059] The above description is only a further embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the scope disclosed by the present utility model, based on the technical solution and concept of the present utility model, shall fall within the protection scope of the present utility model.

Claims

1. A counter-current microchannel acid-resistant dew point tube bundle assembly, comprising a manifold one (1) and a manifold two (2), wherein a flat tube (3) is uniformly welded and installed between the manifold one (1) and the manifold two (2), and both ends of the flat tube (3) penetrate into the interior of the manifold one (1) and the manifold two (2) respectively, and fins (4) are uniformly arranged between the flat tubes (3). Its features are: One side of the manifold 1 (1) is symmetrically equipped with an inlet pipe (15) and an outlet pipe (16). The middle position of the manifold 2 (2) is provided with a flow guide assembly (6). Inside the manifold 1 (1) and at the upper end, there is an isolation pipe (5) fixed, and the isolation pipe (5) and the inlet pipe (15) are connected. Both sides of the isolation pipe (5) are provided with openings. Inside the isolation pipe (5), there are V-shaped plates (7) symmetrically installed. A fixing plate (8) is fixed in the middle position between the V-shaped plates (7). The fixing plate (8) is provided with through holes 1 (9), through holes 2 (10) and through holes 3 (11) from the middle to both ends. A baffle (12) is evenly fixed on the side of the fixing plate (8) away from the inlet pipe (15), and the ends of the baffle (12) are staggered from the inlet of the flat pipe (3).

2. A counterflow microchannel acid-dew-point-tolerant tube bundle assembly according to claim 1, characterized in that: The flow guiding assembly (6) includes a semi-circular plate (601) and a mounting groove (602). The semi-circular plate (601) is located in the middle of the manifold (2) and is close to the end of the flat pipe (3). The bottom of the semi-circular plate (601) away from the flat pipe (3) is provided with a mounting groove (602). A flap (603) is hinged inside the mounting groove (602). A side plate (605) is fixed to the bottom of the semi-circular plate (601). A spring (604) is provided between the bottom of the flap (603) and one side of the side plate (605).

3. The counter-current microchannel acid-resistant dew point tube bundle assembly according to claim 1, characterized in that: Protective pipes (13) are fitted on the outside of manifold 1 (1) and manifold 2 (2), and honeycomb layers (14) are provided between the protective pipes (13) and the interlayer of manifold 1 (1) and manifold 2 (2).

4. The counter-current microchannel acid-resistant dew point tube bundle assembly according to claim 1, characterized in that: The V-shaped plate (7) has a V-shaped angle of 30°-60° and is made of titanium alloy. The bend of the V-shaped plate (7) is polished to form a rounded corner.

5. The counter-current microchannel acid-resistant dew point tube bundle assembly according to claim 1, characterized in that: The diameters of through holes 1 (9), 2 (10) and 3 (11) increase sequentially, and through holes 1 (9), 2 (10) and 3 (11) are set at equal intervals.

6. The counter-current microchannel acid-resistant dew point tube bundle assembly according to claim 2, characterized in that: The inner top wall of the mounting groove (602) is provided with a protective pad, and the flap (603) is slidably connected to the inner side wall of the manifold (2).

7. The counter-current microchannel acid-resistant dew point tube bundle assembly according to claim 1, characterized in that: The inner walls of manifold 1 (1) and manifold 2 (2) are coated with a protective layer, which is a fluorocarbon acid-resistant coating.

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