Finned heat exchange tube, evaporator and air conditioner

Abstract

The application discloses a finned heat exchange tube, an evaporator and an air conditioner. The finned heat exchange tube comprises a plurality of fin units. Each of the fin units comprises a first vaporization structure and a second vaporization structure which are arranged adjacently. The first vaporization structure and the second vaporization structure both have a groove structure to generate a vaporization core. The outlet direction of the groove structure of the first vaporization structure converges with the outlet direction of the groove structure of the second vaporization structure to combine the bubbles generated at the vaporization core of the first vaporization structure with the bubbles generated at the vaporization core of the second vaporization structure. Compared with the prior art, the application adopts an adjacent double-vaporization-core generation point structure to efficiently generate vaporization cores. When the bubbles sweep through the transverse groove, the vaporization cores are left behind, the preparation time of the vaporization cores is shortened, the bubble generation and separation efficiency can be greatly enhanced, and the heat exchange performance of the evaporator is ensured.

Description

Technical Field

[0001] This invention relates to the field of finned heat exchanger tube technology in refrigeration systems, and in particular to a finned heat exchanger tube, evaporator, and air conditioner. Background Technology

[0002] Horizontal tube flooded evaporators, as traditional large-capacity evaporators, are widely used in air conditioning and refrigeration, heat pump heating, chemical and other fields due to their low cost and high stability. When the evaporator is running, the liquid to be evaporated fills the shell-side space outside the heat exchange tubes (the liquid level is usually slightly higher than the highest point of the heat exchange tube bank). The heat released by the fluid inside the tubes is conducted to the liquid outside the tubes through the tube walls and fins, causing the liquid to undergo a phase change. The gas generated by boiling heat exchange is discharged from the top of the heat exchanger.

[0003] Ensuring efficient heat exchange in heat exchange tubes is essential for the efficient operation of flooded evaporators. Currently, the industry commonly uses enhanced heat exchange tubes with spiral 2D fins inside and T-shaped evaporation fins with finned tops on the outside. Because boiling phase change heat exchange is involved outside the tubes, vaporization nuclei need to be generated on the heating surface during heat exchange. These nuclei grow by absorbing heat from the surrounding liquid, stirring the surrounding liquid while detaching from the heating wall. This cyclical process maintains the efficient heat exchange properties of boiling. The heating wall needs a certain degree of superheat compared to the fluid's saturation temperature for the fluid to overcome the energy barrier and generate vaporization nuclei. When the working fluid is water, R1233zd(e), etc., the energy barrier becomes even more difficult to overcome. This increases the superheat requirement for initial boiling. When vaporization nuclei cannot be effectively generated, only one-way relative heat transfer occurs on the heat exchange tube surface, resulting in a much lower heat exchange efficiency than boiling heat exchange.

[0004] In high-temperature steam heat pump units, the evaporator transfers heat from water to the working fluid, causing it to boil. Due to the physical properties of the new refrigerants commonly used in high-temperature heat pumps, such as R1233zd(e), a large temperature difference is required to successfully activate the vaporization nucleus, which can lead to a decrease in the performance of the high-temperature steam heat pump unit.

[0005] Therefore, how to design a finned heat exchanger tube, evaporator, and air conditioner that can improve the heat exchange efficiency of the finned heat exchanger tube is a technical problem that the industry urgently needs to solve. Summary of the Invention

[0006] In view of the problem that the heat exchange efficiency of heat exchange tubes is low when the working fluid is water, R1233zd(e) or other fluids in the prior art, the present invention proposes a finned heat exchange tube, an evaporator and an air conditioner.

[0007] The technical solution of the present invention is to propose a finned heat exchange tube, including multiple finned units 1. Each finned unit 1 includes a first vaporization structure 2 and a second vaporization structure 3 arranged adjacent to each other. Both the first vaporization structure 2 and the second vaporization structure 3 have a groove structure to generate a vaporization core. The outlet direction of the groove structure of the first vaporization structure 2 and the outlet direction of the groove structure of the second vaporization structure 3 converge to facilitate the merging of bubbles generated at the vaporization core of the first vaporization structure 2 and bubbles generated at the vaporization core of the second vaporization structure 3.

[0008] Based on the above-mentioned scheme, this invention can generate vaporization cores through a tank structure, and bubbles can be generated at the vaporization cores. This invention arranges the first vaporization structure 2 and the second vaporization structure 3 adjacent to each other. When the two bubbles are generated simultaneously, they are very likely to collide violently and merge rapidly into a large bubble. This merging process can not only significantly increase the bubble volume and thus greatly improve buoyancy, but also effectively overcome the constraints of surface tension and viscous resistance by utilizing the strong fluid disturbance generated at the moment of merging. This allows the bubble to detach from the fin surface at an extremely high speed, thereby greatly shortening the cycle time required for bubble detachment. This allows the two vaporization cores to immediately and seamlessly connect and start the next round of nucleation and growth process. In addition, even under the non-ideal working condition where the bubbles generated by the two vaporization cores are not at the same frequency, the fluid disturbance field excited by any bubble in the detachment stage still has a significant synergistic effect, which can effectively reduce the gas nucleus activation energy barrier of the other vaporization core, thereby reducing the preparation time of the vaporization core and greatly improving the heat exchange efficiency of the heat exchange tube.

[0009] Furthermore, the tank structure is a conical tank structure, and the vaporization core is located at the bottom of the conical tank structure.

[0010] Based on the above scheme, this invention can control the generation position of vaporization cores according to the boiling nucleation theory that "superheated liquid in a sharp tank can easily cross the energy barrier to generate tiny gas nuclei (vaporization cores)". At the same time, by setting the first vaporization structure 2 and the second vaporization structure 3 adjacent to each other, the bubbles generated by the first vaporization structure 2 and the second vaporization structure 3 can be merged into a large bubble, thereby shortening the cycle time required for the bubble to detach. This allows the two vaporization cores to be seamlessly connected immediately and start the next round of nucleation and growth process, thereby improving the heat exchange efficiency of the heat exchange tube.

[0011] Furthermore, the fin unit 1 has a rectangular structure, and the first vaporization structure 2 and the second vaporization structure 3 are distributed on both sides of the diagonal of the rectangular structure, with the first vaporization structure 2 recessed and the second vaporization structure 3 protruding.

[0012] Based on the above solution, the present invention can utilize the rectangular structure of the finned unit 1 to arrange multiple finned units 1 in an array to form an overall enhanced heat exchange surface, thereby improving heat exchange efficiency.

[0013] Furthermore, both the first vaporization structure 2 and the second vaporization structure 3 are triangular pyramids, and the first vaporization structure 2 is hollow to form a first triangular pyramidal groove 21, while the second vaporization structure 3 is hollow to form a second triangular pyramidal groove 31.

[0014] Based on the above-mentioned scheme, this invention can generate bubbles at the first triangular pyramidal groove 21 and the second triangular pyramidal groove 31. When the two bubbles are generated simultaneously, they are very likely to collide violently and merge rapidly into a large bubble. This merging process can not only significantly increase the bubble volume and thus greatly improve buoyancy, but also effectively overcome the constraints of surface tension and viscous resistance by utilizing the strong fluid disturbance generated at the moment of merging. This allows the bubble to detach from the fin surface at an extremely high speed, thereby greatly shortening the cycle time required for bubble detachment. This enables the two vaporization nuclei to immediately and seamlessly connect and start the next round of nucleation and growth process. In addition, even under the non-ideal working condition where the two vaporization nuclei generate bubbles at different frequencies, the fluid disturbance field excited by any bubble in the detachment stage still has a significant synergistic effect, which can effectively reduce the gas nucleus activation energy barrier of the other vaporization nucleus, thereby reducing the preparation time of the vaporization nucleus and greatly improving the heat exchange efficiency of the heat exchange tube.

[0015] Furthermore, it also includes a first partition 22 disposed at the outlet of the first triangular pyramidal groove 21, and a second partition 32 disposed at the outlet of the second triangular pyramidal groove 31;

[0016] The first partition 22 is connected between the vertex of the outlet of the first triangular pyramid groove 21 and the midpoint of the long side, and the second partition 32 is connected between the vertex of the outlet of the second triangular pyramid groove 31 and the midpoint of the long side.

[0017] Based on the above scheme, the present invention can divide the first triangular pyramidal groove 21 into two by the first partition 22 and the second triangular pyramidal groove 31 into two by the second partition 32, thereby dividing the original two vaporization cores into four vaporization cores, further improving the bubble generation efficiency and the heat exchange efficiency of the finned heat exchange tube.

[0018] Furthermore, the first rib 22 and the second rib 32 are corrugated in shape.

[0019] Based on the above solution, the present invention changes the shape of the first rib 22 and the second rib 32 to a corrugated shape, which can further improve the synergistic effect of bubbles in the detachment stage, reduce the preparation time of vaporization core, and significantly improve the heat exchange efficiency of heat exchange tube.

[0020] Furthermore, both the first vaporization structure 2 and the second vaporization structure 3 are quadrangular pyramids, and the first vaporization structure 2 is hollow to form a first quadrangular pyramidal groove 23, while the second vaporization structure 3 is hollow to form a second quadrangular pyramidal groove 33.

[0021] Based on the above-mentioned scheme, this invention can generate bubbles at the first quadrangular pyramidal groove 23 and the second quadrangular pyramidal groove 33. When the two bubbles are generated simultaneously, they are prone to violent collision and rapid merging into a large bubble. This merging process can not only significantly increase the bubble volume and thus greatly improve buoyancy, but also effectively overcome the constraints of surface tension and viscous resistance by utilizing the strong fluid disturbance generated at the moment of merging. This allows the bubble to detach from the fin surface at an extremely high speed, thereby significantly shortening the cycle time required for bubble detachment. This enables the two vaporization nuclei to immediately and seamlessly connect and start the next round of nucleation and growth process. In addition, even under the non-ideal working condition where the two vaporization nuclei generate bubbles at different frequencies, the fluid disturbance field excited by any bubble in the detachment stage still has a significant synergistic effect, which can effectively reduce the gas nucleus activation energy barrier of the other vaporization nucleus, thereby reducing the preparation time of the vaporization nucleus and significantly improving the heat exchange efficiency of the heat exchange tube.

[0022] Furthermore, it also includes a third partition 24 disposed at the outlet of the first quadrangular pyramidal groove 23, and a fourth partition 34 disposed at the outlet of the second quadrangular pyramidal groove 33.

[0023] Two third partition ribs 24 are provided and are arranged diagonally along the outlet of the first quadrangular pyramidal groove 23. Two fourth partition ribs 34 are provided and are arranged diagonally along the outlet of the second quadrangular pyramidal groove 33.

[0024] Based on the above scheme, the present invention can divide the first quadrangular pyramidal groove 23 into four parts by the third partition 24 and divide the second quadrangular pyramidal groove 33 into four parts by the fourth partition 34, thereby dividing the original two vaporization cores into eight vaporization cores, further improving the bubble generation efficiency and the heat exchange efficiency of the finned heat exchange tube.

[0025] Furthermore, the third rib 24 and the fourth rib 34 are corrugated in shape.

[0026] Based on the above solution, the present invention changes the shape of the third rib 24 and the fourth rib 34 to a corrugated shape, which can further improve the synergistic effect of bubbles in the detachment stage, reduce the preparation time of vaporization core, and significantly improve the heat exchange efficiency of heat exchange tubes.

[0027] Furthermore, it also includes a transverse groove 4 disposed on the outer wall of the second vaporization structure 3.

[0028] Based on the above-mentioned configuration, after the bubbles detach from the wall, they are dominated by buoyancy, and their trajectory will naturally sweep over the conical groove structure located above. During this process, some tiny bubbles will be retained by the transverse groove 4 and enter the interior of another conical groove structure. This unique fluid transport mechanism allows the vaporization core point at the other conical groove structure to be directly heated and grown into a new bubble by the residual gas nucleus without going through a preparation period, thereby completely eliminating the bubble preparation time lag effect under traditional working conditions. At the same time, this bubble sweeping and reattachment process driven by buoyancy not only optimizes the flow field distribution at the moment of bubble detachment, but also significantly expands the effective contact area in the transient heat conduction process, so that the release of latent heat of phase change and the transfer of sensible heat can be carried out simultaneously over a larger range.

[0029] The present invention also proposes an evaporator having the above-described finned heat exchange tube.

[0030] The present invention also proposes an air conditioner having the above-described evaporator.

[0031] Compared with the prior art, the present invention has at least the following beneficial effects:

[0032] 1. This invention, by arranging the first vaporization structure and the second vaporization structure adjacent to each other, and converging the outlet directions of the tank structure of the first vaporization structure and the tank structure of the second vaporization structure, enables the first and second vaporization structures to generate bubbles simultaneously, resulting in a violent collision and rapid merging into a large bubble. This significantly increases the bubble volume and thus greatly enhances buoyancy. Furthermore, the strong fluid disturbance generated at the moment of merging effectively overcomes the constraints of surface tension and viscous resistance, causing the bubble to detach from the fin surface at an extremely high speed. This significantly shortens the cycle time required for bubble detachment, allowing the two vaporization cores to seamlessly connect and initiate the next round of nucleation and growth. Moreover, when the first and second vaporization structures generate bubbles asynchronously, the synergistic effect of the fluid disturbance field excited by any bubble during the detachment stage effectively reduces the activation energy barrier of the other vaporization core, thereby reducing the preparation time of the vaporization core and significantly improving the heat exchange efficiency of the heat exchange tube.

[0033] 2. Through the design of the partition rib, the present invention can divide a conical groove structure domain into multiple conical groove structures, thereby multiplying the number of vaporization cores, further improving the bubble generation efficiency, and improving the heat exchange efficiency of the finned heat exchange tube.

[0034] 3. Through the design of the transverse groove, this invention can retain some microbubbles and allow them to enter the interior of another conical groove structure. This unique fluid transport mechanism allows the vaporization nucleus at the other conical groove structure to be directly heated and grown into new bubbles by the residual gas nuclei without needing a preparation period, thereby completely eliminating the bubble preparation time lag effect under traditional working conditions. At the same time, this bubble grazing and reattachment process driven by buoyancy not only optimizes the flow field distribution at the moment of bubble detachment, but also significantly expands the effective contact area in the transient heat conduction process, so that the release of latent heat of phase change and the transfer of sensible heat can be carried out simultaneously over a larger range. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 This is a three-dimensional view of the finned heat exchange tube in this invention;

[0037] Figure 2 This is a front view of the finned heat exchange tube in this invention;

[0038] Figure 3 This is a top view of the finned heat exchange tube in this invention;

[0039] Figure 4 This is a top view of the finned heat exchange tube in this invention;

[0040] Figures 5 to 8 This is a schematic diagram illustrating the process of a single bubble being generated and detached from the first and second triangular pyramidal grooves in this invention.

[0041] Figure 9 This is a schematic diagram of bubble generation via horizontal grooves in this invention;

[0042] Figure 10 This is a schematic diagram of the structure of a single fin unit in the first embodiment of the present invention;

[0043] Figure 11 This is a schematic diagram of the structure of the present invention after the partition ribs are provided in the first embodiment;

[0044] Figure 12 This is a schematic diagram of the structure of a single fin unit in the second embodiment of the present invention;

[0045] Figure 13 This is a schematic diagram of the structure of the present invention after the partition ribs are provided in the second embodiment;

[0046] Figure 14 This is a schematic diagram of the shape of the partition rib in the first embodiment of the present invention;

[0047] Wherein, 1 is a fin unit, 2 is the first vaporization structure, 3 is the second vaporization structure, and 4 is a transverse groove;

[0048] 21 is the first triangular pyramidal groove, 22 is the first partition rib, 23 is the first quadrangular pyramidal groove, and 24 is the third partition rib;

[0049] 31 is the second triangular pyramidal groove, 32 is the second partition rib, 33 is the second quadrangular pyramidal groove, and 34 is the fourth partition rib. Detailed Implementation

[0050] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0051] Therefore, a feature pointed out in this specification is used to describe one feature of one embodiment of the invention, and does not imply that every embodiment of the invention must have the described feature. Furthermore, it should be noted that this specification describes many features. Although certain features may be combined to illustrate possible system designs, these features may also be used in other combinations not explicitly stated. Therefore, unless otherwise stated, the described combinations are not intended to be limiting.

[0052] The principles and structure of the present invention will be described in detail below with reference to the accompanying drawings and embodiments.

[0053] Currently, the industry generally uses enhanced heat exchange tubes with spiral 2D fins inside and T-shaped evaporation fins on the outside, typically with a finned top. Because boiling phase change heat transfer is involved outside the tube, vaporization nuclei need to be generated on the heating surface during heat exchange. These nuclei grow by absorbing heat from the surrounding liquid, stirring the surrounding liquid while detaching from the heating wall. This process repeats continuously, maintaining the efficient heat exchange properties of boiling. The heating wall needs a certain degree of superheat compared to the fluid's saturation temperature for the fluid to overcome the energy barrier and generate vaporization nuclei. When the working fluid is water, R1233zd(e), etc., the energy barrier becomes even more difficult to overcome. This increases the superheat requirement for initial boiling. When vaporization nuclei cannot be effectively generated, only one-way relative heat transfer occurs on the heat exchange tube surface, resulting in a heat exchange efficiency far lower than boiling heat exchange.

[0054] Transient heat conduction is a subprocess in the boiling heat exchange process. When the bubbles just leave the heat exchange surface, a large amount of subcooled liquid fills the original location of the bubbles and conducts transient heat with the heating surface. Existing literature shows that the heat exchange of transient heat conduction accounts for more than 35% of the total boiling heat exchange. Therefore, enhancing the heat transfer efficiency of the transient heat conduction process can enhance the heat exchange efficiency of the heat exchange tube.

[0055] Based on the above principles, this invention proposes a finned heat exchange tube, which has multiple finned units 1. Each finned unit 1 includes an adjacent first vaporization structure 2 and a second vaporization structure 3. Both the first vaporization structure 2 and the second vaporization structure 3 have a groove structure to generate a vaporization core. The outlet direction of the groove structure of the first vaporization structure 2 and the outlet direction of the groove structure of the second vaporization structure 3 converge to allow the bubbles generated at the vaporization core of the first vaporization structure 2 to merge with the bubbles generated at the vaporization core of the second vaporization structure 3.

[0056] Figure 1 This is a schematic diagram of the structure of the finned heat exchanger tube according to the first embodiment of the present invention. It has multiple finned units 1 composed of quadrilateral structures (rectangular structures) (for ease of explanation, see attached diagram). Figure 1 (A fin unit 1 is highlighted in bold in the text). Figure 10 This is a schematic diagram of the structure of a single fin unit 1 in the first embodiment. Each fin unit 1 has a first vaporization structure 2 and a second vaporization structure 3. Figure 10 The first vaporization structure 2 is a triangular pyramid in the lower left part, with a hollow design forming a trough structure. The outlet direction of this trough structure is upward (i.e., the opening direction of the triangular pyramid trough). The second vaporization structure 3 is a triangular pyramid in the upper right part, with a hollow design forming another trough structure. The outlet direction of this trough structure is to the left (i.e., the opening direction of the triangular pyramid trough). From the attached... Figure 10 It can be clearly seen that the outlet direction of the tank structure of the first vaporization structure 3 and the outlet direction of the tank structure of the second vaporization structure 3 will eventually converge.

[0057] Since the tank structure can generate vaporization nuclei, and bubbles can be generated at the vaporization nuclei, based on the above design, a bubble can be generated in the tank structure of the first vaporization structure 2. The bubble will overflow in the outlet direction of the tank structure of the first vaporization structure 2. Similarly, a bubble will also be generated in the tank structure of the second vaporization structure 3. The bubble will overflow in the outlet direction of the tank structure of the second vaporization structure 3. Finally, the bubble generated at the vaporization nucleus of the first vaporization structure 2 and the bubble generated at the vaporization nucleus of the second vaporization structure 3 meet and merge.

[0058] The bubbles generated by the vaporization core of the first vaporization structure 2 and the vaporization core of the second vaporization structure 3 can be divided into two cases. In the first case, the bubbles at the vaporization core of the first vaporization structure 2 and the bubbles at the vaporization core of the second vaporization structure 3 are generated simultaneously. At this time, the bubbles coming out of the tank structure of the first vaporization structure 2 can be successfully merged with the bubbles coming out of the tank structure of the second vaporization structure 3 and collide violently to merge into a large bubble. This merging process can not only significantly increase the bubble volume and thus greatly improve the buoyancy, but also effectively overcome the constraints of surface tension and viscous resistance by utilizing the strong fluid disturbance generated at the moment of merging, so that the bubble can detach from the fin surface at an extremely fast speed, thereby greatly shortening the cycle time required for the bubble to detach. This allows the two vaporization cores to be seamlessly connected immediately and start the next round of nucleation and growth process. This process is the core design of this invention that can improve the heat exchange efficiency of the heat exchange tube.

[0059] The second scenario is a non-ideal working condition where the bubbles at the vaporization core of the first vaporization structure 2 and the bubbles at the vaporization core of the second vaporization structure 3 are generated at different frequencies. In this case, whether the bubbles are generated at the vaporization core of the first vaporization structure 2 or the vaporization core of the second vaporization structure 3, when they overflow from the corresponding tank structure, the fluid disturbance field excited during the separation stage still has a significant synergistic effect, which can effectively reduce the activation barrier of the gas nucleus of the other vaporization core, thereby reducing the preparation time of the vaporization core. Through this process, the heat exchange efficiency of the heat exchange tube can also be greatly improved.

[0060] After the above design is implemented, the first beneficial effect described in this application can be achieved:

[0061] This invention, by arranging the first vaporization structure 2 and the second vaporization structure 3 adjacent to each other and converging the outlet direction of the tank structure of the first vaporization structure 2 with the outlet direction of the tank structure of the second vaporization structure 3, enables the simultaneous generation of bubbles in the first vaporization structure 2 and the second vaporization structure 3 to easily collide violently and rapidly merge into a large bubble, significantly increasing the bubble volume and thus greatly enhancing buoyancy. Furthermore, by utilizing the strong fluid disturbance generated at the moment of merging, the constraints of surface tension and viscous resistance are effectively overcome, causing the bubble to detach from the fin surface at an extremely high speed, thereby significantly shortening the cycle time required for bubble detachment. This allows the two vaporization cores to immediately and seamlessly connect and start the next round of nucleation and growth process. Moreover, when the generation of bubbles in the first vaporization structure 2 and the second vaporization structure 3 is asynchronous, the synergistic effect of the fluid disturbance field excited by any bubble during the detachment stage can effectively reduce the nucleus activation energy barrier of the other vaporization core, thereby reducing the preparation time of the vaporization core and significantly improving the heat exchange efficiency of the heat exchange tube.

[0062] As mentioned above, the core of achieving the above workflow lies in the fact that the vaporization core is located in the tank structure of the first vaporization structure 2 and the tank structure of the second vaporization structure 3. To this end, the present invention sets the tank structure as a conical tank structure, so that the vaporization core is located at the bottom of the conical tank structure.

[0063] In the first embodiment of the present invention, the above-mentioned conical groove structure is a triangular pyramidal groove. In the second embodiment of the present invention, the above-mentioned conical groove structure is a square pyramidal groove. It should be noted that the design scheme provided by the present invention is not limited to the above-mentioned triangular pyramidal groove and square pyramidal groove design. The design of multi-sided pyramidal grooves can achieve the same technical effect and should be within the protection scope of the present invention.

[0064] The conical groove structure allows the vaporization nucleus to be located at the bottom of the groove, which is based on the boiling nucleation theory that "superheated liquid in a sharp groove easily crosses the energy barrier to generate tiny gas nuclei (vaporization nuclei)". The conical groove structure is also a sharp groove, in which superheated liquid easily crosses the energy barrier to generate tiny gas nuclei, i.e., vaporization nuclei. In this invention, the groove structure of the first vaporization structure 2 and the second vaporization structure 3 is designed as a conical groove structure, which can control the position of vaporization nucleus generation. At the same time, by setting the first vaporization structure 2 and the second vaporization structure 3 adjacent to each other, the bubbles generated by the first vaporization structure 2 and the second vaporization structure 3 can be merged into a large bubble, thereby shortening the cycle time required for bubble detachment. This allows the two vaporization nuclei to immediately and seamlessly connect and start the next round of nucleation and growth process, thereby improving the heat exchange efficiency of the heat exchange tube.

[0065] Furthermore, in this invention, each fin unit 1 is designed as a rectangular structure, with the first vaporization core 2 and the second vaporization core 3 distributed on both sides of the diagonal of the rectangular structure, and the first vaporization structure 2 is recessed while the second vaporization structure 3 is protruding.

[0066] Specifically, in the first embodiment of the present invention, due to the adoption of a triangular pyramid design, each fin unit 1 can be further optimized into a square structure; in the second embodiment of the present invention, each fin unit 1 is a rectangular structure.

[0067] Appendix Figure 4 In the first embodiment of the present invention, based on the heat exchange surface formed after the above design, from the attached... Figure 4 It can be clearly seen that each fin unit 1 is a square structure. The present invention arranges multiple fin units 1 in an array to form an overall enhanced heat exchange surface, thereby improving the overall heat exchange efficiency.

[0068] In addition, from the appendix Figure 10 It can also be seen that a transverse groove 4 is provided on the second vaporization structure 2 of each fin unit 1, combined with Figure 1 and Figure 9 As can be seen, after being arranged in the above array, some of the tiny bubbles generated in the vaporization core of the second vaporization structure 2 will be retained by the transverse groove 4 and enter the interior of another conical groove structure. This unique fluid transport mechanism allows the vaporization core point at the other conical groove structure to be heated and grown into a new bubble directly using the residual gas nucleus without going through a preparation period, thereby completely eliminating the bubble preparation time lag effect under traditional working conditions.

[0069] In other words, by designing each fin unit 1 as a rectangular structure and arranging them in an array, the present invention can not only form an overall enhanced heat exchange surface to improve the overall heat exchange efficiency, but also facilitate the entry of tiny bubbles in the second vaporization structure 2 into the interior of another conical groove structure through the transverse groove 4, thereby eliminating the bubble preparation time lag effect under traditional operating conditions.

[0070] The structures of the first and second embodiments of the present invention will be described below with reference to the accompanying drawings. Please refer to [the accompanying drawings]. Figures 1 to 4 and appendix Figure 10 In this first embodiment, both the first vaporization structure 2 and the second vaporization structure 3 are triangular pyramids, and the first vaporization structure 2 is hollow to form a first triangular pyramid groove 21, and the second vaporization structure 3 is hollow to form a second triangular pyramid groove 31.

[0071] Please see the appendix Figure 5 To be continued Figure 8 This describes the bubble generation process in the first embodiment of the present invention (see attached diagram). Figure 5 To be continued Figure 8 The arc-shaped part in the middle is a bubble. Thanks to the adjacent layout of the bubble detachment channel of the vaporization core of the first vaporization structure 2 and the vaporization core of the second vaporization structure 3, when the two bubbles are generated simultaneously, they are very likely to collide violently and merge into a large bubble. This merging process not only significantly increases the bubble volume and thus greatly improves buoyancy, but also utilizes the strong fluid disturbance generated at the moment of merging to effectively overcome the constraints of surface tension and viscous resistance, causing the bubble to detach from the fin surface at an extremely fast speed, thereby greatly shortening the cycle time required for bubble detachment, so that the two vaporization cores can immediately and seamlessly connect and start the next round of nucleation and growth process.

[0072] Furthermore, even under non-ideal conditions where the vaporization cores of the first vaporization structure 2 and the second vaporization structure 3 generate bubbles at different frequencies, the fluid disturbance field excited by any bubble during the detachment stage still has a significant synergistic effect, which can effectively reduce the activation energy barrier of the gas nucleus of the other vaporization core, thereby reducing the preparation time of the vaporization core.

[0073] In the first embodiment of the present invention, a first partition 22 disposed at the outlet of the first triangular pyramidal groove 21 and a second partition 32 disposed at the outlet of the second triangular pyramidal groove 31 are also included.

[0074] The first partition 22 is connected between the vertex at the outlet of the first triangular pyramid groove 21 and the midpoint of the long side, and the second partition 32 is connected between the vertex at the outlet of the second triangular pyramid groove 31 and the midpoint of the long side.

[0075] like Figure 11 As shown, the outlet of the first triangular pyramidal groove 21 is a triangle, with the vertex at the outlet being the vertex of the triangle and the long side being the side opposite to the vertex of the triangle. The first partition 22 connects the midpoint between the vertex of the triangle and its corresponding side, and the partition 22 is designed to extend downwards to the bottom of the first triangular pyramidal groove 21. Through the design of the first partition 22, the first triangular pyramidal groove 21 can be divided into two parts. Originally, the entire first triangular pyramidal groove 21 was a sharp groove that could only form one vaporization nucleus. After being divided by the first partition 22, the first triangular pyramidal groove 21 can be divided into two smaller triangular pyramidal grooves, which are equivalent to having two sharp grooves, that is, they can form two vaporization nuclei.

[0076] The design of the second triangular pyramidal groove 31 is consistent with the design of the first triangular pyramidal groove 21. The second triangular pyramidal groove 31 can be divided into two small triangular pyramidal grooves by the second partition 32, which is equivalent to having two sharp grooves, that is, it can form two vaporization nuclei.

[0077] With the above design scheme, the present invention can divide the first triangular pyramidal groove 21 into two by the first partition 22 and the second triangular pyramidal groove 31 into two by the second partition 32, thereby dividing the original two vaporization cores into four vaporization cores, further improving the bubble generation efficiency and the heat exchange efficiency of the finned heat exchange tube.

[0078] Please see Figure 14 In a preferred embodiment of the present invention, the shapes of the first rib 22 and the second rib 32 may also be corrugated.

[0079] Based on the above solution, the present invention changes the shape of the first rib 22 and the second rib 32 to a corrugated shape, which can further improve the synergistic effect of bubbles in the detachment stage, reduce the preparation time of vaporization core, and significantly improve the heat exchange efficiency of heat exchange tube.

[0080] Please see Figure 12 In the second embodiment of the present invention, the first vaporization structure 2 and the second vaporization structure 3 are both square pyramids, and the first vaporization structure 2 is hollow to form a first square pyramid groove 23, and the second vaporization structure 3 is hollow to form a second square pyramid groove 33.

[0081] Its bubble generation process is the same as that of the first embodiment. Thanks to the adjacent arrangement of the vaporization core of the first vaporization structure 2 and the vaporization core bubble detachment channel of the second vaporization structure 3, when the two bubbles are generated simultaneously, they are very likely to collide violently and merge into a large bubble. This merging process not only significantly increases the bubble volume and thus greatly improves buoyancy, but also utilizes the strong fluid disturbance generated at the moment of merging to effectively overcome the constraints of surface tension and viscous resistance, causing the bubble to detach from the fin surface at an extremely fast speed, thereby greatly shortening the cycle time required for bubble detachment, so that the two vaporization cores can immediately and seamlessly connect and start the next round of nucleation and growth process.

[0082] Furthermore, even under non-ideal conditions where the vaporization cores of the first vaporization structure 2 and the second vaporization structure 3 generate bubbles at different frequencies, the fluid disturbance field excited by any bubble during the detachment stage still has a significant synergistic effect, which can effectively reduce the activation energy barrier of the gas nucleus of the other vaporization core, thereby reducing the preparation time of the vaporization core.

[0083] In the second embodiment of the present invention, a third partition 24 is provided at the outlet of the first quadrangular pyramidal groove 23, and a fourth partition 34 is provided at the outlet of the second quadrangular pyramidal groove 33.

[0084] Two third partition ribs 24 are provided, and they are arranged diagonally along the outlet of the first quadrangular pyramidal groove 23. Two fourth partition ribs 34 are provided, and they are arranged diagonally along the outlet of the second quadrangular pyramidal groove 33.

[0085] Please see Figure 13 The outlet of the first quadrangular pyramidal groove 23 is a quadrilateral, and the third partition 24 is connected to the diagonal of the quadrilateral. The partition 24 is designed to extend downward to the bottom of the first quadrangular pyramidal groove 23. Through the design of the third partition 24, the first quadrangular pyramidal groove 23 can be divided into four parts. Originally, the entire first quadrangular pyramidal groove 23 was a sharp groove that could only form one vaporization nucleus. After being divided by the third partition 24, the first quadrangular pyramidal groove 23 can be divided into four small triangular pyramidal grooves, which is equivalent to having four sharp grooves, that is, it can form four vaporization nuclei.

[0086] The design of the second quadrangular pyramidal groove 33 is consistent with the design of the first quadrangular pyramidal groove 23. The second quadrangular pyramidal groove 33 can be divided into four small triangular pyramidal grooves by the fourth partition 34, which is equivalent to having four sharp grooves, that is, it can form four vaporization nuclei.

[0087] With the above design scheme, the first quadrangular pyramidal groove 23 can be divided into four by the third partition 24 and the second quadrangular pyramidal groove 33 can be divided into four by the fourth partition 34, thereby dividing the original two vaporization cores into eight vaporization cores, further improving the bubble generation efficiency and the heat exchange efficiency of the finned heat exchange tube.

[0088] Similarly, in a preferred embodiment of the present invention, the shapes of the third rib 24 and the fourth rib 34 can also be set to corrugated.

[0089] Based on the above solution, the present invention changes the shape of the third rib 24 and the fourth rib 34 to a corrugated shape, which can further improve the synergistic effect of bubbles in the detachment stage, reduce the preparation time of vaporization core, and significantly improve the heat exchange efficiency of heat exchange tubes.

[0090] The design of the first partition 22 and the second partition 32 in the first embodiment, and the design of the third partition 24 and the fourth partition 34 in the second embodiment, can achieve the second beneficial effect described in this application:

[0091] This invention, through the design of ribs, can divide a single conical groove structure domain into multiple conical groove structures, thereby multiplying the number of vaporization nuclei, further improving the bubble generation efficiency, and enhancing the heat exchange efficiency of the finned heat exchange tube.

[0092] Please see Figure 9 and Figure 10 The present invention also includes a transverse groove 4 disposed on the outer wall of the second vaporization structure 3;

[0093] Here is an appendix Figure 9 and attached Figure 10 This corresponds to the first embodiment of the present invention, but it does not mean that only the first embodiment is provided with the transverse groove 4. The transverse groove 4 can also be provided in the second embodiment to achieve the same technical effect.

[0094] From the appendix Figure 10 It can be clearly seen that a transverse groove 4 is provided on the outer wall of the protruding second vaporization structure 3, which is directly connected to the second triangular pyramidal groove 31, allowing some tiny bubbles to pass through the transverse groove 4. Figure 9 The array arrangement of multiple finned units 1 is shown. Based on this arrangement, at the outlet of the transverse groove 4 of the second vaporization structure 3, it can correspond to the outlet of the groove structure of the first vaporization structure 2 of the second finned unit 1, so that the first vaporization structure 2 can directly use the residual gas nuclei to quickly heat and grow into new bubbles, thereby completely eliminating the bubble preparation time lag effect under traditional working conditions.

[0095] like Figure 9As shown, the horizontal axis and the vertical axis correspond to the axial and circumferential directions of the finned heat exchange tube, respectively. Since the finned heat exchange tube is arranged horizontally, after the bubble leaves the wall, it is dominated by buoyancy and its trajectory will naturally pass over the triangular pyramid structure located above. During this process, some tiny bubbles will be retained by the horizontal groove 4 and enter the triangular pyramid groove of another finned unit 1. This unique fluid transport mechanism allows the vaporization core point at the other cone groove structure to be heated and grown into a new bubble directly using the residual gas nucleus without going through a preparation period, thereby completely eliminating the bubble preparation time lag effect under traditional working conditions.

[0096] At the same time, this buoyancy-driven bubble swirling and reattachment process not only optimizes the flow field distribution at the moment of bubble detachment, but also significantly expands the effective contact area in the transient heat conduction process, enabling the release of latent heat of phase change and the transfer of sensible heat to occur simultaneously over a larger area.

[0097] The above design achieves the third beneficial effect described in this application:

[0098] This invention, through the design of the transverse groove, can retain some microbubbles and allow them to enter the interior of another conical groove structure. This unique fluid transport mechanism allows the vaporization nucleus at the other conical groove structure to be directly heated and rapidly grown into new bubbles using the residual gas nuclei without needing a preparation period, thus completely eliminating the bubble preparation time lag effect under traditional operating conditions. At the same time, this bubble grazing and reattachment process driven by buoyancy not only optimizes the flow field distribution at the moment of bubble detachment, but also significantly expands the effective contact area in the transient heat conduction process, enabling the release of latent heat of phase change and the transfer of sensible heat to occur simultaneously over a larger area.

[0099] Furthermore, in other embodiments of the present invention, a corrugated structure or grooves can be added to the surface of the conical groove structure to further enhance the transient thermal conductivity during bubble detachment, thereby improving the heat exchange efficiency of the heat exchange tube.

[0100] The above is a detailed structural description of the finned heat exchanger tube proposed in this invention. As can be seen from the above description, this invention has at least the following three beneficial effects compared to the prior art:

[0101] 1. This invention, by arranging the first vaporization structure and the second vaporization structure adjacent to each other, and converging the outlet directions of the tank structure of the first vaporization structure and the tank structure of the second vaporization structure, enables the first and second vaporization structures to generate bubbles simultaneously, resulting in a violent collision and rapid merging into a large bubble. This significantly increases the bubble volume and thus greatly enhances buoyancy. Furthermore, the strong fluid disturbance generated at the moment of merging effectively overcomes the constraints of surface tension and viscous resistance, causing the bubble to detach from the fin surface at an extremely high speed. This significantly shortens the cycle time required for bubble detachment, allowing the two vaporization cores to seamlessly connect and initiate the next round of nucleation and growth. Moreover, when the first and second vaporization structures generate bubbles asynchronously, the synergistic effect of the fluid disturbance field excited by any bubble during the detachment stage effectively reduces the activation energy barrier of the other vaporization core, thereby reducing the preparation time of the vaporization core and significantly improving the heat exchange efficiency of the heat exchange tube.

[0102] 2. Through the design of the partition rib, the present invention can divide a conical groove structure domain into multiple conical groove structures, thereby multiplying the number of vaporization cores, further improving the bubble generation efficiency, and improving the heat exchange efficiency of the finned heat exchange tube.

[0103] 3. Through the design of the transverse groove, this invention can retain some microbubbles and allow them to enter the interior of another conical groove structure. This unique fluid transport mechanism allows the vaporization nucleus at the other conical groove structure to be directly heated and grown into new bubbles by the residual gas nuclei without needing a preparation period, thereby completely eliminating the bubble preparation time lag effect under traditional working conditions. At the same time, this bubble grazing and reattachment process driven by buoyancy not only optimizes the flow field distribution at the moment of bubble detachment, but also significantly expands the effective contact area in the transient heat conduction process, so that the release of latent heat of phase change and the transfer of sensible heat can be carried out simultaneously over a larger range.

[0104] Based on the above-mentioned finned heat exchange tube, the present invention also proposes an evaporator having the above-mentioned finned heat exchange tube to improve the heat exchange efficiency of the evaporator.

[0105] Furthermore, the present invention also proposes an air conditioner having the aforementioned evaporator.

[0106] It should be noted that the terminology used above is for describing specific embodiments only and is not intended to limit the exemplary embodiments of the present invention. When the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof. The order of execution of actions, steps, etc., in the apparatus and methods described in the specification and drawings can be implemented in any order unless a specific order is expressly specified, and as long as the output of the preceding process is not used in the subsequent process. Similar sequential terms used for ease of description do not imply that such an order must be followed.

[0107] Techniques, methods, and apparatus known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and apparatus should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as constraints. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0108] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A finned heat exchanger tube, comprising a plurality of finned units (1), characterized in that, Each of the fin units (1) includes a first vaporization structure (2) and a second vaporization structure (3) arranged adjacent to each other. Both the first vaporization structure (2) and the second vaporization structure (3) have a groove structure to generate a vaporization core. The outlet direction of the groove structure of the first vaporization structure (2) and the outlet direction of the groove structure of the second vaporization structure (3) converge to allow the bubbles generated at the vaporization core of the first vaporization structure (2) to merge with the bubbles generated at the vaporization core of the second vaporization structure (3).

2. The finned heat exchanger tube according to claim 1, characterized in that, The tank structure is a conical groove structure, and the vaporization core is located at the bottom of the conical groove structure.

3. The finned heat exchanger tube according to claim 2, characterized in that, The fin unit (1) has a rectangular structure. The first vaporization structure (2) and the second vaporization structure (3) are distributed on both sides of the diagonal of the rectangular structure. The first vaporization structure (2) is recessed, and the second vaporization structure (3) is protruding.

4. The finned heat exchanger tube according to claim 3, characterized in that, Both the first vaporization structure (2) and the second vaporization structure (3) are triangular pyramids, and the first vaporization structure (2) is hollow to form a first triangular pyramid groove (21), and the second vaporization structure (3) is hollow to form a second triangular pyramid groove (31).

5. The finned heat exchanger tube according to claim 4, characterized in that, It also includes a first partition rib (22) disposed at the outlet of the first triangular pyramidal groove (21) and a second partition rib (32) disposed at the outlet of the second triangular pyramidal groove (31). The first partition rib (22) is connected between the vertex of the outlet of the first triangular pyramidal groove (21) and the midpoint of the long side, and the second partition rib (32) is connected between the vertex of the outlet of the second triangular pyramidal groove (31) and the midpoint of the long side.

6. The finned heat exchanger tube according to claim 5, characterized in that, The first rib (22) and the second rib (32) are corrugated in shape.

7. The finned heat exchanger tube according to claim 3, characterized in that, Both the first vaporization structure (2) and the second vaporization structure (3) are quadrangular pyramids, and the first vaporization structure (2) is hollow to form a first quadrangular pyramidal groove (23), and the second vaporization structure (3) is hollow to form a second quadrangular pyramidal groove (33).

8. The finned heat exchanger tube according to claim 7, characterized in that, It also includes a third partition rib (24) disposed at the outlet of the first quadrangular pyramidal groove (23) and a fourth partition rib (34) disposed at the outlet of the second quadrangular pyramidal groove (33). Two third partition ribs (24) are provided and are arranged diagonally along the outlet of the first quadrangular pyramidal groove (23). Two fourth partition ribs (34) are provided and are arranged diagonally along the outlet of the second quadrangular pyramidal groove (33).

9. The finned heat exchanger tube according to claim 8, characterized in that, The third rib (24) and the fourth rib (34) are corrugated in shape.

10. The finned heat exchanger tube according to claim 3, characterized in that, It also includes a transverse groove (4) disposed on the outer wall of the second vaporization structure (3).

11. An evaporator, characterized in that, The evaporator has a finned heat exchange tube as described in any one of claims 1 to 10.

12. An air conditioner, characterized in that, The air conditioner has an evaporator as described in claim 11.

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