Heat exchange fin, heat exchange tube and falling film evaporator

Abstract

The utility model relates to a heat exchange fin, a heat exchange tube and a falling film evaporator, and the heat exchange fin comprises a base body internally provided with an evaporation cavity; in the flowing direction of the liquid film, the second flow guide part is positioned above the first flow guide part; the second flow guide piece comprises a flow guide groove and a blocking part, the flow guide groove penetrates through the surface of the base body, and a groove opening communicated with the evaporation cavity is formed in the surface of the base body; the blocking part is arranged in the groove opening and divides the flow guide groove into a first groove section, a cavitation section and a second groove section, and the cavitation section is communicated between the first groove section and the second groove section. The heat exchange tube comprises a tube body; the heat exchange fin is provided. The falling film evaporator comprises the heat exchange tube. According to the heat exchange fin, the heat exchange tube and the falling film evaporator, a plurality of vaporization cores can be excited and generated at the same time through the first groove section and the second groove section, and the generated vaporization cores can be temporarily stored in the cavitation section, so that the generation efficiency of steam cores is greatly improved.

Description

Technical Field

[0001] This application relates to the field of heat exchanger technology, and in particular to a heat exchange fin, heat exchange tube and falling film evaporator. Background Technology

[0002] Horizontal tube falling film evaporators, as a new type of high-efficiency and energy-saving equipment, are gradually replacing flooded evaporators due to their advantages such as small refrigerant charge, small hydrostatic pressure difference, high heat exchange efficiency, and convenient oil return. Unlike flooded evaporators, falling film evaporators have devices such as liquid distributors and distribution plates installed in the liquid film flow direction to ensure the liquid film is evenly spread on the surface of the heat exchange tubes. If the liquid distribution effect is not ideal, the heat exchanger will experience deterioration in heat transfer and liquid carryover during suction. In recent years, due to the demands for energy conservation, environmental protection, cost reduction, and efficiency improvement, the design requirements for compact falling film evaporators have been increasing. However, compared with general falling film evaporators, compact evaporators have a smaller liquid refrigerant flow rate, which places higher demands on film distribution.

[0003] However, existing falling film evaporators do not have fin designs that utilize the liquid film flow pattern during falling film to enhance boiling heat transfer, resulting in unsatisfactory film distribution and reduced heat transfer efficiency. Utility Model Content

[0004] Therefore, it is necessary to provide a heat exchange fin, heat exchange tube, and falling film evaporator to address the problem of low heat transfer efficiency of existing falling film evaporators.

[0005] A heat exchange fin is used to evaporate liquid refrigerant and form a liquid film and a gaseous refrigerant. The heat exchange fin includes: a substrate with an evaporation chamber inside; a first flow guide and a second flow guide disposed on the same surface of the substrate; the first flow guide is used to guide the liquid film, and the second flow guide is used to guide the gaseous refrigerant; in the liquid film flow direction, the second flow guide is located above the first flow guide, and both the second flow guide and the first flow guide protrude along the liquid film flow direction; wherein, the second flow guide includes a flow guide groove and a blocking portion; the flow guide groove penetrates the surface of the substrate and forms a slot on the surface of the substrate that communicates with the evaporation chamber; the blocking portion is disposed at the slot and divides the flow guide groove into a first slot segment, a cavitation segment, and a second slot segment; the cavitation segment communicates between the first slot segment and the second slot segment.

[0006] In the aforementioned heat exchange fins, the blocking part of the second flow guide is located at the opening of the flow guide groove, dividing the flow guide groove into a first groove section, a cavitation section, and a second groove section. Multiple vaporization nuclei can be generated simultaneously through the first groove section and the second groove section. Furthermore, the vaporization nuclei generated can be temporarily stored in the cavitation section, which greatly improves the generation efficiency of vapor nuclei. By utilizing the inertia of the liquid film, the gaseous refrigerant is separated from the liquid film through the first flow guide, increasing the detachment frequency of the gaseous refrigerant and enhancing the heat transfer efficiency of the transient heat conduction process.

[0007] In one embodiment, in the direction of liquid film flow, the first channel segment has a first input end and a first output end, the first output end being located below the first input end and used to output the gaseous refrigerant. The beneficial effect here is that, since the first output end is located below the first input end, due to buoyancy, the gaseous refrigerant output from the first output end will escape from bottom to top, while the liquid film flows from top to bottom. The escape direction of the gaseous refrigerant is opposite to the flow direction of the liquid film, which facilitates rapid separation of the liquid film and the gaseous refrigerant, increases the frequency of gaseous refrigerant separation, and enhances the heat transfer efficiency of the transient heat conduction process.

[0008] In one embodiment, in the direction of liquid film flow, the second channel section has a second input end and a second output end. The second output end is located below the second input end and is used to output the gaseous refrigerant. The cavitation section is located between the second output end and the first output end. The beneficial effects here are: the second output end is located below the second input end, and due to buoyancy, the gaseous refrigerant output from the second output end will escape from bottom to top, while the liquid film flows from top to bottom. The escape direction of the gaseous refrigerant is opposite to the flow direction of the liquid film, which facilitates rapid separation of the liquid film and the gaseous refrigerant; the generated vaporization nuclei will pass over the obstruction and be temporarily stored in the cavitation section. Utilizing the ability to temporarily store the generated vaporization nuclei in the cavitation section significantly improves the generation efficiency of the vapor nuclei.

[0009] In one embodiment, the second output end and the first output end are flush in the direction of liquid film flow. The advantage here is that, with the second and first output ends flush, multiple vaporization nuclei can be generated simultaneously at the same height, significantly improving the vaporization nucleus generation efficiency at the same height.

[0010] In one embodiment, the first and / or second groove segments are arc-shaped grooves protruding along the flow direction of the liquid film. The beneficial effect here is that the arc-shaped first and / or second groove segments facilitate the smooth flow of the liquid film into the first and second groove segments, enabling the simultaneous generation of multiple vaporization nuclei. Furthermore, the vaporization nuclei generated can be temporarily stored within the cavitation segment, significantly improving the generation efficiency of vapor nuclei.

[0011] In one embodiment, both the first and second groove segments are arc-shaped grooves, and the two arc-shaped grooves are constructed as two 1 / 4 circular arc structures symmetrically distributed around the cavitation segment. The beneficial effect here is that multiple vaporization nuclei can be simultaneously generated through the first and second groove segments. The first and second groove segments are symmetrically distributed around the cavitation segment, which is beneficial for the uniformity and efficiency of the vaporization nuclei distribution.

[0012] In one embodiment, the first guide member has two branching ends and a confluence end, with the two branching ends spaced apart; in the direction of liquid film flow, each branching end is located above the confluence end. The beneficial effect here is that the liquid film is split into two streams by the two branching ends, and the two streams flow from top to bottom towards the confluence end, preventing the liquid film from contracting and rupturing, enhancing the spreading of the liquid film on the heat exchange tube surface, avoiding the formation of dry spots, and reducing the probability of deterioration in bottom heat transfer during falling film evaporation heat exchange.

[0013] In one embodiment, the central axis of the confluence end coincides with the central axis of the cavitation segment. The beneficial effect here is that, because the central axis of the confluence end coincides with the central axis of the cavitation segment, under the guiding effect of the confluence end, the bubbles produced by the cavitation segment can quickly detach from the surface of the substrate, increasing the detachment frequency of the gaseous refrigerant and enhancing the heat transfer efficiency of the transient heat conduction process.

[0014] In one embodiment, the first flow guide is an arc-shaped boss protruding along the flow direction of the liquid film. The beneficial effect here is that, as an arc-shaped boss, the first flow guide allows for faster separation of the gaseous refrigerant from the liquid film by utilizing the inertia of the liquid film, increasing the frequency of gaseous refrigerant separation and enhancing the heat transfer efficiency of the transient heat conduction process.

[0015] In one embodiment, the arc-shaped protrusion is constructed as a circular arc structure symmetrically distributed around the cavitation segment. The beneficial effects here are: the arc-shaped protrusion, symmetrically distributed around the cavitation segment, enhances the transient heat conduction when the liquid film wets the arc-shaped protrusion after the bubble detaches, improves boiling heat transfer efficiency, and enhances the spreading of the liquid film on the heat exchange tube surface.

[0016] In one embodiment, the central angle of the arc structure ranges from 45° to 90°. The beneficial effect here is that by limiting the central angle θ of the arc structure to a preset range, not only can the spreading effect of the liquid film be enhanced, but the velocity of the liquid film perpendicular to the surface of the heat exchange tube in the first guide element also meets the requirements, ensuring that the detachment velocity of bubbles from the first guide element is within the preset range.

[0017] In one embodiment, in the direction of liquid film flow, the arcuate protrusion has an inner surface located between the two branch ends and facing the first guide member, the inner surface being constructed as a smooth arcuate surface. The beneficial effect here is that the smooth arcuate surface allows generated bubbles to quickly detach from the inner surface of the first guide member, increasing the detachment speed of the bubbles from the first guide member, increasing the detachment frequency of the gaseous refrigerant, and enhancing the heat transfer efficiency of the transient heat conduction process.

[0018] In one embodiment, in the direction of liquid film flow, the arcuate protrusion has an inner surface located between the two branch ends and facing the first guide member, the inner surface being constructed as a wavy arcuate structure. The beneficial effect here is that the wavy arcuate structure of the inner surface increases friction when bubbles pass over the first guide member, slightly reducing the bubble detachment speed from the first guide member, enhancing transient heat conduction when the liquid film wets the arcuate protrusion after bubble detachment, improving boiling heat transfer efficiency, and enhancing the spread of the liquid film on the heat exchange tube surface.

[0019] In one embodiment, the number of the first flow guides is at least two, and each first flow guide forms at least two rows. The first flow guides in the same row are spaced apart, and the first flow guides in different rows are staggered. The beneficial effect here is that the liquid film is sequentially diverted by the rows of first flow guides, preventing the liquid film from shrinking and breaking, enhancing the spreading of the liquid film on the surface of the heat exchange tube, avoiding the formation of dry spots, and reducing the probability of deterioration of bottom heat transfer during falling film evaporation heat exchange.

[0020] In one embodiment, the blocking portion is integrally formed on the surface of the substrate. The advantage here is that the blocking portion and the substrate are an integral structure, resulting in good overall integrity and high mechanical strength.

[0021] A heat exchange tube includes: a tube body; and heat exchange fins disposed on the outer surface of the tube body.

[0022] In the aforementioned heat exchange tube, the blocking part of the second flow guide of the heat exchange fins is located at the opening of the flow guide groove, dividing the flow guide groove into a first groove section, a cavitation section, and a second groove section. Multiple vaporization nuclei can be generated simultaneously through the first groove section and the second groove section, and the generated vaporization nuclei can be temporarily stored in the cavitation section, which greatly improves the generation efficiency of vapor nuclei. By utilizing the inertia of the liquid film, the gaseous refrigerant is separated from the liquid film through the first flow guide, which increases the detachment frequency of the gaseous refrigerant and enhances the heat transfer efficiency of the transient heat conduction process.

[0023] A falling film evaporator includes the heat exchange tubes described above.

[0024] In the aforementioned falling film evaporator, the blocking part of the second flow guide of the heat exchange fins is located at the opening of the flow guide channel, dividing the flow guide channel into a first channel section, a cavitation section, and a second channel section. Multiple vaporization nuclei can be generated simultaneously through the first and second channel sections, and the generated vaporization nuclei can be temporarily stored in the cavitation section, which greatly improves the generation efficiency of vapor nuclei. By utilizing the inertia of the liquid film, the gaseous refrigerant is separated from the liquid film through the first flow guide, which increases the detachment frequency of the gaseous refrigerant and enhances the heat transfer efficiency of the transient heat conduction process. Attached Figure Description

[0025] Figure 1This is an isometric view of the heat exchange fins in some embodiments of this application.

[0026] Figure 2 for Figure 1 A magnified view of part A of the heat exchange fins shown.

[0027] Figure 3 for Figure 1 The side view of the heat exchange fins shown.

[0028] Figure 4 for Figure 3 A magnified view of part B of the heat exchange fins shown.

[0029] Figure 5 for Figure 1 The top view of the heat exchange fins shown.

[0030] Figure 6 for Figure 1 A schematic diagram of the central angle of the first guide element in the heat exchange fins shown.

[0031] Figure 7 This is a side view of the heat exchange fins in some other embodiments of this application.

[0032] Figure 8 for Figure 7 The top view of the heat exchange fins shown.

[0033] Figure label:

[0034] 100. Matrix; 101. Evaporation chamber;

[0035] 200, First guide component; 210, Diverting end; 220, Converging end; 230, Inner surface;

[0036] 300, Second flow guide; 310, Flow guide groove; 310a, Groove opening; 311, First groove section; 311a, First input end; 311b, First output end; 312, Cavitation section; 313, Second groove section; 313a, Second input end; 313b, Second output end;

[0037] 320. Blocking section. Detailed Implementation

[0038] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0039] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application 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 of this application.

[0040] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0041] In this application, unless otherwise expressly specified and limited, the terms "initial," "connected," "linked," and "fixed," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0042] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0043] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0044] Please refer to Figures 1 to 4 In one embodiment, the heat exchange fins are used to evaporate liquid refrigerant and form a liquid film and a gaseous refrigerant. The heat exchange fins include a substrate 100, a first flow guide 200 and a second flow guide 300. An evaporation chamber 101 is provided inside the substrate 100. The first flow guide 200 and the second flow guide 300 are disposed on the same surface of the substrate 100. The first flow guide 200 is used to guide the liquid film, and the second flow guide 300 is used to guide the gaseous refrigerant. In the direction of liquid film flow, the second flow guide 300 is located above the first flow guide 200.

[0045] The second flow guide 300 includes a flow guide groove 310 and a blocking part 320. The flow guide groove 310 penetrates the surface of the substrate 100 and forms a slot 310a on the surface of the substrate 100 that communicates with the evaporation chamber 101. The blocking part 320 is disposed at the slot 310a and divides the flow guide groove 310 into a first slot segment 311, a cavitation segment 312 and a second slot segment 313. The cavitation segment 312 communicates between the first slot segment 311 and the second slot segment 313.

[0046] It should be noted that the first groove segment 311, the air cavitation segment 312 and the second groove segment 313 are arranged sequentially from left to right. The first groove segment 311 and the second groove segment 313 are connected through the air cavitation segment 312. Both the first groove segment 311 and the second groove segment 313 are connected to the outside world, while the air cavitation segment 312 is not connected to the outside world.

[0047] Here, liquid refrigerant is sprayed from top to bottom onto the outer surface of the heat exchange fins. The liquid refrigerant flows axially and circumferentially on the outer surface of the heat exchange fins, forming a liquid film on the surface of the substrate 100. Due to the continuous heating of the evaporation chamber 101, the liquid film is evaporated and vaporized during the flow process to form gaseous refrigerant. When the liquid film flows along... Figures 3 to 4When the liquid film flows in the Z direction as shown, it impacts the first guide member 200. Part of the liquid film is split into two streams, left and right, by the first guide member 200. The other part of the liquid film enters the first tank section 311 and the second tank section 313 and generates vaporization nuclei. The generated vaporization nuclei will pass over the blocking part 320 and be temporarily stored in the cavitation section 312. The vaporization nuclei stored in the cavitation section 312 will generate bubbles (i.e., gaseous refrigerant) after being heated. Since the liquid film impacts the first guide member 200, it will generate a velocity component perpendicular to the surface of the substrate 100, so that the generated bubbles can quickly detach from the surface of the substrate 100.

[0048] In the aforementioned heat exchange fins, the blocking portion 320 of the second flow guide 300 is provided at the slot 310a of the flow guide 310, dividing the flow guide 310 into a first slot section 311, a cavitation section 312, and a second slot section 313. Multiple vaporization nuclei can be generated simultaneously through the first slot section 311 and the second slot section 313, and the generated vaporization nuclei can be temporarily stored in the cavitation section 312, which greatly improves the generation efficiency of vapor nuclei. By utilizing the inertia of the liquid film, the gaseous refrigerant is separated from the liquid film through the first flow guide 200, which increases the detachment frequency of the gaseous refrigerant and enhances the heat transfer efficiency of the transient heat conduction process.

[0049] In the embodiments of this application, the substrate 100 is a component having an evaporation chamber 101, and the substrate 100 can adopt various structural forms. For example, the substrate 100 is a hollow tubular structure, and the tubular structure can be a round tube, a square tube, or other shapes. The shape of the substrate 100 is not limited here.

[0050] In the embodiments of this application, the first guide member 200 is a component used for guiding the liquid film, and the first guide member 200 can adopt various structural forms. For example, the first guide member 200 is a boss protruding from the surface of the substrate 100 to facilitate guiding and distributing the liquid film.

[0051] In the embodiments of this application, the second flow guide 300 is a component used to guide the flow of gaseous refrigerant, and the second flow guide 300 can adopt various structural forms. For example, the second flow guide 300 includes a flow guide groove 310 and a blocking part 320. The flow guide groove 310 is a groove provided on the surface of the substrate 100, and the blocking part 320 is integrally formed on the surface of the substrate 100. The blocking part 320 divides the flow guide groove 310 into a first groove segment 311, a cavitation segment 312 and a second groove segment 313. Multiple vaporization nuclei can be generated simultaneously through the first groove segment 311 and the second groove segment 313, and the generated vaporization nuclei can be temporarily stored in the cavitation segment 312.

[0052] For details, please refer to Figure 5 In the direction of liquid film flow, the first tank section 311 has a first input end 311a and a first output end 311b. The first output end 311b is located below the first input end 311a and is used to output gaseous refrigerant.

[0053] It is understandable that when the liquid film moves from top to bottom (i.e. along...) Figure 5 When the liquid film flows in the Z direction (as shown), it can enter the first tank section 311 from the first input end 311a. It is evaporated in the first tank section 311 and generates vaporization nuclei. The generated vaporization nuclei will pass over the blocking part 320 and be temporarily stored in the cavitation section 312. The vaporization nuclei stored in the cavitation will generate bubbles after being heated. The bubbles will be output to the outside of the first tank section 311 through the first output end 311b.

[0054] The beneficial effects here are as follows: the first output terminal 311b is located below the first input terminal 311a. Due to the buoyancy, the gaseous refrigerant output from the first output terminal 311b will escape from bottom to top, while the liquid film flows from top to bottom. The escape direction of the gaseous refrigerant is opposite to the flow direction of the liquid film, which is conducive to the rapid separation of the liquid film and the gaseous refrigerant, increases the separation frequency of the gaseous refrigerant, and enhances the heat transfer efficiency of the transient heat conduction process.

[0055] In the embodiments of this application, the number of the first input terminal 311a and the first output terminal 311b is not limited to one; that is, the number of the first input terminal 311a and the first output terminal 311b can both be at least two. Here, the number of the first input terminal 311a and the first output terminal 311b is not limited.

[0056] For more specific details, please refer to Figure 5 In the direction of liquid film flow, the second groove section 313 has a second input end 313a and a second output end 313b. The second output end 313b is located below the second input end 313a and is used to output gaseous refrigerant. The cavitation section 312 is located between the second output end 313b and the first output end 311b.

[0057] It is understandable that when the liquid film moves from top to bottom (i.e. along...) Figure 5 When the liquid film flows in the Z direction (as shown), it can enter the second tank section 313 from the second input end 313a. It is evaporated in the second tank section 313 and generates vaporization nuclei. The generated vaporization nuclei will pass over the blocking part 320 and be temporarily stored in the cavitation section 312. The vaporization nuclei stored in the cavitation section 312 will generate bubbles after being heated. The bubbles will be output to the outside of the second tank section 313 through the second output end 313b.

[0058] The beneficial effects here are as follows: the second output terminal 313b is located below the second input terminal 313a. Due to buoyancy, the gaseous refrigerant output from the second output terminal 313b will escape from bottom to top, while the liquid film will flow from top to bottom. The escape direction of the gaseous refrigerant is opposite to the flow direction of the liquid film, which is conducive to the rapid separation of the liquid film and the gaseous refrigerant. The generated vaporization nuclei will pass over the blocking part 320 and be temporarily stored in the cavitation section 312. The generation efficiency of vaporization nuclei is greatly improved by utilizing the ability to temporarily store the generated vaporization nuclei in the cavitation section 312.

[0059] In the embodiments of this application, the number of the second input terminal 313a and the second output terminal 313b is not limited to one; that is, the number of the second input terminal 313a and the second output terminal 313b can both be at least two. Here, the number of the second input terminal 313a and the second output terminal 313b is not limited.

[0060] In the embodiments of this application, the cavitation segment 312 is disposed between the second output terminal 313b and the first output terminal 311b. The cavitation segment 312 can be arc-shaped or straight-shaped. The shape of the cavitation segment 312 is not limited here.

[0061] For a specific embodiment, please refer to Figure 5 In the direction of liquid film flow, the second output terminal 313b and the first output terminal 311b are flush.

[0062] It should be noted that the second output terminal 313b and the first output terminal 311b are flush, that is: along Figure 5 As shown, the second output terminal 313b and the first output terminal 311b are at the same height in the Z direction.

[0063] The beneficial effect here is that the second output terminal 313b and the first output terminal 311b are set at the same level, and multiple vaporization cores can be generated at the same height position, which greatly improves the vaporization core generation efficiency at the same height position.

[0064] In the embodiments of this application, the second input terminal 313a and the first input terminal 311a may be flush or not flush in the direction of liquid film flow.

[0065] Please refer to Figure 5 The first groove segment 311 and / or the second groove segment 313 are arc-shaped grooves that protrude along the direction of liquid film flow.

[0066] It is understandable that some liquid film enters the first tank section 311 and the second tank section 313 and generates vaporization nuclei. The generated vaporization nuclei will pass over the blocking part 320 and be temporarily stored in the cavitation section 312. The vaporization nuclei stored in the cavitation section 312 will generate bubbles (i.e., gaseous refrigerant) after being heated.

[0067] The beneficial effects here are: the first groove segment 311 and / or the second groove segment 313 are arc-shaped grooves, which facilitates the smooth flow of the liquid film into the first groove segment 311 and the second groove segment 313, and can simultaneously stimulate the generation of multiple vaporization nuclei. Furthermore, the vaporization nuclei generated can be temporarily stored in the cavitation segment 312, which greatly improves the generation efficiency of vapor nuclei.

[0068] In the embodiments of this application, the first groove segment 311 and the second groove segment 313 may both be configured as arc-shaped grooves, or one of them may be configured as an arc-shaped groove. The arc-shaped groove may be a single circular arc groove, a multi-circular arc combination groove, or a parabolic arc groove.

[0069] For details, please refer to Figure 5 The first groove segment 311 and the second groove segment 313 are both arc-shaped grooves, and the two arc-shaped grooves are constructed as two 1 / 4 circular arc structures symmetrically distributed with the cavitation segment 312 as the center.

[0070] It should be noted that, along Figure 5 In the Z direction shown, the first groove segment 311 and the second groove segment 313 are symmetrically distributed on the left and right with the air cavitation segment 312 as the center, and both the first groove segment 311 and the second groove segment 313 are 1 / 4 circular arc structures.

[0071] The beneficial effect here is that multiple vaporization nuclei can be generated simultaneously through the first groove segment 311 and the second groove segment 313. The first groove segment 311 and the second groove segment 313 are symmetrically distributed on the left and right sides with the cavitation segment 312 as the center, which is conducive to the uniformity and efficiency of the distribution of vaporization nuclei.

[0072] Please refer to Figure 5 The first guide member 200 has two branch ends 210 and a confluence end 220, with the two branch ends 210 being spaced apart; in the direction of liquid film flow, each branch end 210 is located above the confluence end 220.

[0073] It is understandable that, since the first guide member 200 has two branching ends 210 located above the confluence end 220, when the liquid film flows along... Figure 5 When the liquid film flows in the Z direction as shown, it will first impact the two diversion ends 210 of the first guide member 200. Part of the liquid film is diverted into two streams on the left and right by the two diversion ends 210. The two diverted liquid films flow from top to bottom to converge at the confluence end 220.

[0074] The beneficial effects here are: the liquid film is split into two streams by the two split ends 210, and the two streams of liquid film flow from top to bottom to converge at the confluence end 220, which prevents the liquid film from shrinking and breaking, enhances the spreading of the liquid film on the surface of the heat exchange tube, avoids the formation of dry spots, and reduces the probability of deterioration of bottom heat transfer during falling film evaporation heat exchange.

[0075] In the embodiments of this application, the two shunt ends 210 are along Figure 5 The X-direction interval distribution shown is in Figure 5 The top sides of the two split ends 210 in the Z direction are flush to facilitate uniform liquid film splitting.

[0076] In the embodiments of this application, the two shunt terminals 210 are in Figure 5 The Z-direction shown is located above the confluence end 220, and the confluence end 220 is along... Figure 5 The X direction shown is located in the middle of the two split ends 210 to facilitate uniform splitting and collection of the liquid film.

[0077] Further, please refer to Figure 5 The central axis of the confluence end 220 is set to coincide with the central axis of the cavitation segment 312.

[0078] It is understandable that when the liquid film moves along Figure 5 When the flow is from top to bottom in the Z direction as shown, the vaporization nuclei stored in the cavitation section 312 generate bubbles (i.e., gaseous refrigerant) after being heated. The liquid film impacts the first guide member 200 and generates a velocity component perpendicular to the surface of the substrate 100. Under the guidance of the confluence end 220, the generated bubbles can quickly detach from the surface of the substrate 100.

[0079] The beneficial effect here is that, since the central axis of the confluence end 220 coincides with the central axis of the cavitation section 312, under the guiding action of the confluence end 220, the bubbles produced by the cavitation section 312 can quickly detach from the surface of the substrate 100, increasing the detachment frequency of the gaseous refrigerant and enhancing the heat transfer efficiency of the transient heat conduction process.

[0080] In the embodiments of this application, the confluence end 220 is also the bottom of the first guide member 200, and the cavitation section 312 is also the bottom of the second guide member 300. The central axis of the confluence end 220 and the central axis of the cavitation section 312 are arranged to coincide, that is, the central axis of the bottom of the first guide member 200 and the central axis of the bottom of the second guide member 300 are arranged to coincide.

[0081] Please refer to Figure 5 The first guide member 200 is an arc-shaped boss that protrudes along the direction of liquid film flow.

[0082] It should be noted that when the liquid film moves along Figure 5When the liquid film flows in the Z direction as shown, it impacts the first guide member 200. Part of the liquid film is split into two streams, left and right, by the first guide member 200. The other part of the liquid film enters the first tank section 311 and the second tank section 313 and generates vaporization nuclei. The generated vaporization nuclei will pass over the blocking part 320 and be temporarily stored in the cavitation section 312. The vaporization nuclei stored in the cavitation section 312 will generate bubbles (i.e., gaseous refrigerant) after being heated. Since the liquid film impacts the first guide member 200, it will generate a velocity component perpendicular to the surface of the substrate 100, so that the generated bubbles can quickly detach from the surface of the substrate 100.

[0083] The beneficial effects here are: the first flow guide 200 is an arc-shaped boss, which utilizes the inertia of the liquid film to more quickly separate the gaseous refrigerant from the liquid film, increasing the separation frequency of the gaseous refrigerant and enhancing the heat transfer efficiency of the transient heat conduction process.

[0084] In the embodiments of this application, the first flow guide 200 and the base 100 can be an integral structure, for example, the first flow guide 200 and the base 100 can be integrally formed by injection molding, casting or other methods, which has good integrity and high mechanical strength. Alternatively, the first flow guide 200 and the base 100 can also be a separate structure, for example, the first flow guide 200 and the base 100 can be fixed by plugging or snapping.

[0085] Further, please refer to Figure 5 The arc-shaped protrusion is constructed as a circular arc structure symmetrically distributed around the air cavity segment 312.

[0086] It should be noted that, along Figure 5 In the Z direction shown, the arc-shaped protrusions are symmetrically distributed on the left and right sides with the air cavity segment 312 as the center, and the arc-shaped protrusions as a whole are a circular arc structure.

[0087] The beneficial effects here are: the arc-shaped protrusions are constructed to be symmetrically distributed around the cavitation segment 312, which enhances the transient heat conduction when the liquid film wets the arc-shaped protrusions after the bubbles detach, enhances the boiling heat exchange efficiency, and enhances the spreading of the liquid film on the surface of the heat exchange tube.

[0088] Furthermore, please refer to Figure 6 The central angle of the arc structure ranges from 45° to 90°.

[0089] It should be noted that the central angle of the arc structure is θ. The smaller the central angle θ of the arc structure, the smaller the arc of the arc structure, which can increase the flow rate of the liquid film when it flows through the first guide member 200, and enhance the spreading effect of the liquid film. However, the velocity of the liquid film decreases when it is perpendicular to the surface of the heat exchange tube at the first guide member 200, which will reduce the detachment velocity of the bubbles at the first guide member 200.

[0090] The beneficial effect here is that by limiting the central angle θ of the arc structure to a preset range, not only can the spreading effect of the liquid film be enhanced, but also the velocity of the liquid film perpendicular to the surface of the heat exchange tube in the first guide 200 meets the requirements, so that the detachment velocity of the bubbles in the first guide 200 is within the preset range.

[0091] For specific embodiments, please refer to Figure 6 In the direction of liquid film flow, the arc-shaped boss has an inner surface 230 located between the two split ends 210 and facing the first guide member 200. The inner surface 230 is constructed as a smooth arc surface structure.

[0092] It is understandable that when the liquid film moves along Figure 6 When the flow is from top to bottom in the Z direction as shown, the vaporization nuclei stored in the cavitation section 312 generate bubbles (i.e., gaseous refrigerant) after being heated. The liquid film impacts the first guide member 200 and generates a velocity component perpendicular to the surface of the substrate 100. Under the guidance of the inner side 230, the generated bubbles can quickly detach from the surface of the substrate 100.

[0093] The beneficial effect here is that the inner surface 230 is constructed as a smooth arc surface structure, which enables the generated bubbles to quickly detach from the inner surface 230 of the first flow guide 200, which helps to increase the detachment speed of the bubbles from the first flow guide 200, increases the detachment frequency of the gaseous refrigerant, and enhances the heat transfer efficiency of the transient heat conduction process.

[0094] In the embodiments of this application, the inner surface 230 is constructed as a smooth arc surface structure, that is, the surface of the inner surface 230 is smooth as a whole and there are no folded edges or other structures.

[0095] For specific embodiments, please refer to Figure 7 and Figure 8 In the direction of liquid film flow, the arc-shaped boss has an inner surface 230 located between the two split ends 210 and facing the first guide member 200. The inner surface 230 is constructed as a wave arc surface structure.

[0096] The beneficial effects here are: the inner surface 230 is constructed as a wave arc surface structure, which increases the friction when the bubble passes over the first guide 200, slightly reduces the bubble's detachment speed from the first guide 200, enhances the transient heat conduction when the liquid film wets the arc-shaped protrusion after the bubble detaches, enhances the boiling heat exchange efficiency, and enhances the spread of the liquid film on the heat exchange tube surface.

[0097] In the embodiments of this application, the inner surface 230 is constructed as a wavy arc surface structure, that is, the surface of the inner surface 230 is provided with folded edges and other structures.

[0098] Please refer to Figure 6The number of first guide elements 200 is at least two, and each first guide element 200 forms at least two rows. The first guide elements 200 in the same row are distributed at intervals, and the first guide elements 200 in different rows are staggered.

[0099] It should be noted that, since the first guide member 200 has two branching ends 210 located above the confluence end 220, when the liquid film flows along... Figure 6 When the liquid film flows in the Z direction as shown, it first impacts the two diversion ends 210 of each of the first guide members 200 in the first row. Part of the liquid film is diverted into two streams by the two diversion ends 210 of each of the first guide members 200 in the first row. The two diverted liquid films flow from top to bottom to converge at the confluence end 220 of each of the first guide members 200 in the first row. Then, it is diverted into two streams by the two diversion ends 210 of each of the first guide members 200 in the second row. Then, it continues to flow from top to bottom to converge at the confluence end 220 of each of the first guide members 200 in the second row. In this way, the liquid film is diverted sequentially by each of the first diversion members in the row.

[0100] The beneficial effects here are: the liquid film is sequentially diverted by the rows of first diverting elements, which prevents the liquid film from shrinking and breaking, enhances the spreading of the liquid film on the surface of the heat exchange tube, avoids the formation of dry spots, and reduces the probability of deterioration of bottom heat transfer during falling film evaporation heat exchange.

[0101] In the embodiments of this application, all the first guide members 200 are the same size and shape to facilitate the uniform distribution of the liquid film. For example, all the first guide members 200 are horseshoe-shaped with the same size.

[0102] Please refer to Figure 6 The blocking part 320 is integrally formed on the surface of the base 100.

[0103] The beneficial effect here is that the blocking part 320 and the base 100 are an integral structure, with good integrity and high mechanical strength.

[0104] In the embodiments of this application, the blocking part 320 and the base 100 are integral structures. The blocking part 320 and the base 100 can be integrally formed by injection molding, casting or other methods. The specific method of integral forming of the blocking part 320 is not limited here.

[0105] Please refer to Figure 1 In one embodiment, the heat exchange tube includes a tube body and the aforementioned heat exchange fins, with the heat exchange fins disposed on the outer surface of the tube body.

[0106] In the aforementioned heat exchange tube, the blocking portion 320 of the second flow guide 300 of the heat exchange fins is provided at the slot opening 310a of the flow guide 310, dividing the flow guide 310 into a first slot section 311, a cavitation section 312, and a second slot section 313. Multiple vaporization nuclei can be generated simultaneously through the first slot section 311 and the second slot section 313, and the generated vaporization nuclei can be temporarily stored in the cavitation section 312, which greatly improves the generation efficiency of vapor nuclei. By utilizing the inertia of the liquid film, the gaseous refrigerant is separated from the liquid film through the first flow guide 200, which increases the detachment frequency of the gaseous refrigerant and enhances the heat transfer efficiency of the transient heat conduction process.

[0107] In the embodiments of this application, heat exchange fins are disposed on the outer surface of the tube body. The heat exchange fins and the tube body can be an integral structure, such as being integrally formed by injection molding, casting or other methods, which has good integrity and high mechanical strength; or, the heat exchange fins and the tube body can also be a separate structure, such as the heat exchange fins and the tube body being fixed by snap-fitting, riveting or other methods.

[0108] Please refer to Figure 1 In one embodiment, the falling film evaporator includes the heat exchange tubes described above.

[0109] It should be noted that, in addition to the heat exchange tubes mentioned above, falling film evaporators also include other components such as liquid distributors and flow equalizers.

[0110] In the aforementioned falling film evaporator, the blocking portion 320 of the second flow guide 300 of the heat exchange fins is located at the slot opening 310a of the flow guide 310, dividing the flow guide 310 into a first slot section 311, a cavitation section 312, and a second slot section 313. Multiple vaporization nuclei can be generated simultaneously through the first slot section 311 and the second slot section 313, and the generated vaporization nuclei can be temporarily stored in the cavitation section 312, which greatly improves the generation efficiency of vapor nuclei. By utilizing the inertia of the liquid film, the gaseous refrigerant is separated from the liquid film through the first flow guide 200, which increases the detachment frequency of the gaseous refrigerant and enhances the heat transfer efficiency of the transient heat conduction process.

[0111] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0112] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A heat exchange fin for evaporating a liquid refrigerant and forming a liquid film and a gaseous refrigerant, characterized by, The heat exchange fins include: The substrate (100) has an internal evaporation chamber (101). The first flow guide (200) and the second flow guide (300) are disposed on the same surface of the substrate (100). The first flow guide (200) is used to guide the liquid film, and the second flow guide (300) is used to guide the gaseous refrigerant. In the direction of liquid film flow, the second flow guide (300) is located above the first flow guide (200). The second flow guide (300) includes a flow guide groove (310) and a blocking part (320). The flow guide groove (310) penetrates the surface of the substrate (100) and forms a slot (310a) on the surface of the substrate (100) that communicates with the evaporation chamber (101). The blocking part (320) is disposed at the slot (310a) and divides the flow guide groove (310) into a first slot segment (311), a cavitation segment (312) and a second slot segment (313). The cavitation segment (312) communicates between the first slot segment (311) and the second slot segment (313).

2. The heat exchange fin according to claim 1, characterized by, In the direction of liquid film flow, the first channel segment (311) has a first input end (311a) and a first output end (311b), the first output end (311b) being located below the first input end (311a) and used to output the gaseous refrigerant.

3. The heat exchange fins according to claim 2, characterized in that, In the direction of liquid film flow, the second groove section (313) has a second input end (313a) and a second output end (313b). The second output end (313b) is located below the second input end (313a) and is used to output the gaseous refrigerant. The cavitation section (312) is located between the second output end (313b) and the first output end (311b).

4. The heat transfer fin according to claim 3, wherein In the direction of liquid film flow, the second output end (313b) and the first output end (311b) are flush.

5. The heat exchange fin according to claim 1, wherein The first groove segment (311) and / or the second groove segment (313) are arc-shaped grooves that protrude along the direction of liquid film flow.

6. The heat transfer fin according to claim 5, wherein Both the first groove segment (311) and the second groove segment (313) are arc-shaped grooves, and the two arc-shaped grooves are constructed as two 1 / 4 circular arc structures symmetrically distributed with the air cavitation segment (312) as the center.

7. The heat transfer fin according to claim 1, wherein The first guide member (200) has two diversion ends (210) and a confluence end (220), with the two diversion ends (210) spaced apart; in the direction of liquid film flow, each diversion end (210) is located above the confluence end (220).

8. The heat transfer fin according to claim 7, wherein The central axis of the confluence end (220) is set to coincide with the central axis of the cavitation segment (312).

9. The heat transfer fin according to claim 7, wherein The first guide member (200) is an arc-shaped boss that protrudes along the direction of liquid film flow.

10. The heat exchange fins according to claim 9, characterized in that, The arc-shaped protrusion is constructed as an arc structure symmetrically distributed around the air cavity segment (312).

11. The heat transfer fin according to claim 10, wherein The central angle of the arc structure ranges from 45° to 90°.

12. The heat transfer fin according to claim 9, wherein In the direction of liquid film flow, the arcuate boss has an inner surface (230) located between the two diversion ends (210) and facing the first guide member (200), the inner surface (230) being constructed as a smooth arcuate structure.

13. The heat transfer fin according to claim 9, wherein In the direction of liquid film flow, the arcuate boss has an inner surface (230) located between the two diversion ends (210) and facing the first guide member (200), the inner surface (230) being constructed as a wavy arcuate structure.

14. The heat exchange fin according to claim 1, wherein The number of the first guide element (200) is at least two, and each of the first guide elements (200) forms at least two rows. The first guide elements (200) in the same row are spaced apart, and the first guide elements (200) in different rows are staggered.

15. The heat exchange fin according to claim 1, wherein The blocking part (320) is integrally formed on the surface of the substrate (100).

16. A heat exchange tube, characterized by include: tube body; The heat exchange fins as described in any one of claims 1-15 are disposed on the outer surface of the tube body.

17. A falling film evaporator characterized in that Includes the heat exchange tube as described in claim 16.

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