A tubular air conditioner heat exchanger

Abstract

The application discloses a tubular air conditioner heat exchanger, comprising a refrigerant box, the inner side of which is provided with heat exchange pipes, the inner cavity of the refrigerant box is connected with both ends of the heat exchange pipes to form a passage; the surface of the fin group is provided with sleeve holes sleeved on the surface of the heat exchange pipes, and the fin group comprises multiple groups of double-layer composite fins arranged along the surface of the sleeve holes, each group of the composite fins is combined by a first pressing sheet and a second pressing sheet; and a piezoelectric vibration assembly is arranged at both ends of the fin group and used for high-frequency vibration cleaning of the surface of the fin group. In the application, a small fluid channel is integrated on the opposite surface of the double-layer fin group by using CNC processing, and a heat pipe working medium (such as water, ethanol or acetone) is filled in the small fluid channel; the working medium is vaporized by absorbing heat at one end of the fin close to the heat exchange pipe, flows to the edge or thinner part of the fin and is condensed by radiating heat, and then returns to the surrounding of the heat exchange pipe to form a circulation, so that the heat pipe technology is effectively utilized to significantly improve the heat conduction efficiency and temperature uniformity of the fin.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of air conditioner heat exchangers, in particular to a tubular air conditioner heat exchanger. BACKGROUND

[0002] Currently, traditional air conditioner heat exchangers generally adopt a structure combining single-layer fins with heat exchange tubes, where the fins are usually made of metal materials (such as aluminum or copper) to transfer heat from the inside of the refrigerant tubes to the outside air through the heat conduction performance of the fins. However, in this structural design, the shape of the fins is mostly a simple flat sheet, and heat exchange is only completed by natural convection and the heat conduction performance of the metal material. In addition, the fin surface lacks special treatment, and dust and particulate matter can easily accumulate on the surface during long-term use, affecting the heat exchange efficiency. At the same time, the fin design relies on a single material, which is limited by material performance and cannot balance heat conductivity and mechanical strength.

[0003] However, the existing traditional technical solutions have the following defects:

[0004] Limited heat transfer efficiency: The heat transfer of the traditional single-layer fin structure mainly depends on the material heat conduction performance of the fins, but the heat contact area between the fins and the heat exchange tubes is limited, and higher efficient heat conduction paths cannot be achieved inside the fins, which cannot utilize heat pipe technology to achieve rapid heat transfer and uniform distribution, easily causing local overheating or uneven temperature.

[0005] Insufficient convective heat exchange effect: The flat sheet structure of the traditional fins cannot effectively disturb the airflow, and the existence of fluid laminar flow greatly limits the convective heat exchange efficiency. In addition, the fin surface has not been specially treated, and it is difficult to enhance fluid turbulence or destroy the boundary layer effect, which cannot further improve the heat exchange performance.

[0006] Poor mechanical performance of fins: Traditional fins are mostly made of a single metal material, which has certain heat conduction performance, but the high-temperature strength, corrosion resistance, and long-term reliability of the material cannot meet the needs of complex working conditions, and the fins are easily affected by fatigue damage or environmental corrosion, resulting in a shortened service life.

[0007] High maintenance cost: Traditional heat exchangers lack dustproof design, and dust and particulate matter can easily accumulate on the surface of the fins during long-term operation, leading to a decrease in heat exchange performance, which requires regular shutdown for manual cleaning, increasing maintenance costs and interrupting operation time.

[0008] In view of the defects of the above-mentioned traditional technical solutions, the present application combines heat pipe technology, double-layer composite fin structure, bionics surface design, and piezoelectric vibration cleaning function to propose a tubular air conditioner heat exchanger with higher heat exchange efficiency, more reliable structural performance, and lower maintenance cost, to solve the problems in the prior art. SUMMARY

[0009] The application provides a tubular air conditioner heat exchanger, which improves heat exchange efficiency, structural reliability and dustproof performance by optimizing the structural design of a refrigerant box, heat exchange pipes, a fin group and a piezoelectric vibration assembly.

[0010] The tubular air conditioner heat exchanger comprises:

[0011] Basic structure:

[0012] The refrigerant box is internally provided with the heat exchange pipes, and the inner cavity of the refrigerant box is connected with both ends of the heat exchange pipes to form a passage.

[0013] The fin group is provided with sleeve holes on the surface of the fin group, and the sleeve holes are sleeved on the surface of the heat exchange pipes.

[0014] The piezoelectric vibration assembly is arranged at both ends of the fin group and is used for high-frequency vibration cleaning of the surface of the fin group.

[0015] The first pressing sheet and the second pressing sheet are fixedly connected through hot pressing sintering or a heat-conducting adhesive, are provided with a plurality of backflow flow channels and a heat-conducting flow channel arranged around the outer periphery of the sleeve hole on the opposite surfaces, form an internal microchannel structure, and are filled with a heat pipe working medium in the microchannel. The outer surface of the fin group is provided with a micron-level bionic fish scale-shaped convex surface and a groove wing convex surface for increasing turbulent flow and improving convective heat exchange efficiency.

[0016] Optimized air flow velocity design: the outer surface of the first pressing sheet and the second pressing sheet is provided with a wing convex surface, and the cross section is in the shape of a wing. The wing-shaped cross section is optimized through computational fluid dynamics (CFD) to maximize air flow and heat transfer efficiency. Through the wing-shaped cross section design, the surface air flow velocity is enhanced, the fluid laminar flow state is destroyed, turbulent flow is formed, and the convective heat exchange efficiency is further improved.

[0017] Microchannel size and working medium: the size of the backflow flow channel and the heat-conducting flow channel ranges from 10 microns to 500 microns, and the heat pipe working medium is water, ethanol or acetone. By controlling the microchannel size and filling the working medium of the backflow flow channel and the heat-conducting flow channel, the heat pipe medium vaporization and condensation backflow process is efficient, and the heat conduction performance of the fin is further improved.

[0018] Bionic surface optimization: The outer surface of the fin assembly is formed with bionic fish-scale-like projections and grooves through laser micromachining or nanoimprinting. The height and depth of these bionic fish-scale projections and grooves range from 1 micron to 50 microns. The bionic fish-scale structure significantly improves convective heat transfer efficiency by enhancing surface turbulence, while the surface projections and grooves help reduce contaminant adhesion.

[0019] Piezoelectric Vibration Assembly: This assembly includes a fixed bar base, a clamping lug base, and a piezoelectric ceramic body fixed to the base. The clamping lug base is connected to the outer surface of the fin assembly. The piezoelectric ceramic body generates high-frequency vibrations to remove dust and particulate matter from the fin assembly surface. The piezoelectric ceramic body operates at a frequency of 20kHz to 100kHz. The piezoelectric vibration function of the piezoelectric vibration assembly effectively removes dust and particulate matter from the fin surface, maintaining long-term heat exchange efficiency and reducing cleaning and maintenance costs.

[0020] Optimized double-layer composite fin materials: The first pressing plate of the fin assembly is made of metal, while the second pressing plate is made of ceramic. The metal material is copper or aluminum, and the ceramic material is alumina or silicon nitride. This combination of metal and ceramic ensures high thermal conductivity while enhancing the mechanical strength and long-term reliability of the fin structure.

[0021] Optimized heat pipe working medium flow: The cooling and heat transfer channels are arranged diagonally downward, allowing the working medium to flow back to the inner side of the heat transfer channel after condensation. The working medium circulates and transfers heat within these channels by absorbing heat, evaporating, and releasing heat, condensing. This diagonal arrangement allows the working medium to naturally return due to gravity, optimizing the heat pipe's circulation efficiency and further enhancing overall heat transfer.

[0022] Electronic Control System Cleaning Mode: The vibration time and frequency of the piezoelectric vibrating assembly are regulated by the electronic control system to achieve intermittent cleaning mode. Through the electronic control system, the vibration time and frequency of the piezoelectric vibrating assembly are intermittently adjusted to ensure the fin surface remains clean while reducing energy consumption.

[0023] This invention comprehensively improves the heat transfer efficiency, structural performance and operational reliability of the tubular air-conditioning heat exchanger by optimizing the design of key components such as the refrigerant box, fin group, and piezoelectric vibration assembly, while significantly reducing operating and maintenance costs.

[0024] The beneficial effects achieved by the present invention are:

[0025] 1. In the present invention, micro fluid channels are integrated using CNC machining on the opposite sides of the double-layer fin group and filled with heat pipe working medium (such as water, ethanol or acetone). The working medium absorbs heat and vaporizes at the end of the fin close to the heat exchange tube, flows to the edge or thinner part of the fin, dissipates heat and condenses, and then flows back to the heat exchange tube to form a circulation. This effective use of heat pipe technology significantly improves the thermal conductivity and temperature uniformity of the fin.

[0026] 2. In the present invention, micron-scale bionic fish-scale protrusions and grooves and wing-shaped convex surfaces are processed on the outer surface of the fin to simulate the surface texture of fish scales, destroy the boundary layer effect, and enhance the turbulence of the fluid. This not only improves the convective heat transfer efficiency, but also combines with computational fluid dynamics (CFD) optimization to significantly increase the flow rate of the surface airflow, destroy the laminar state of the fluid, form turbulence, and enhance the convective heat transfer efficiency.

[0027] 3. In the present invention, a fin group structure is formed by combining a first pressing plate and a second pressing plate. By adopting a double-layer composite fin structure, a metal material (such as copper or aluminum) and a ceramic material (such as alumina or silicon nitride) are combined together, fully utilizing the high thermal conductivity of the metal and the high strength and high temperature resistance of the ceramic, thereby optimizing the heat transfer efficiency and enhancing the mechanical properties and long-term reliability of the fins.

[0028] 4. In the present invention, by installing piezoelectric vibration components at the upper and lower ends of the fins, the high-frequency micro-vibration generated by the piezoelectric ceramic body is used to effectively prevent dust and particulate matter from adhering to the surface of the fins, maintain the long-term high-efficiency heat exchange performance of the fins, and reduce the cost of cleaning and maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present invention;

[0030] Figure 2 A schematic diagram of the decomposed structure of an embodiment of the present invention;

[0031] Figure 3 This is a schematic structural diagram of a fin group and a piezoelectric vibration component according to an embodiment of the present invention;

[0032] Figure 4 This is a schematic diagram of the surface structure of a fin group according to an embodiment of the present invention;

[0033] Figure 5 This is a schematic diagram of the cross-sectional structure of a fin assembly according to an embodiment of the present invention;

[0034] Figure 6 This is a schematic diagram of the exploded structure of the first pressing tablet and the second pressing tablet according to an embodiment of the present invention;

[0035] Figure 7 For an embodiment of the present invention Figure 6A structure schematic diagram of the A.

[0036] Reference signs:

[0037] 100, refrigerant box; 110, heat exchange pipe;

[0038] 200, fin group; 201, sleeve hole; 202, outer cold fin; 210, first pressing fin; 220, second pressing fin; 211, wing convex surface; 212, back cooling flow channel; 213, heat conduction flow channel;

[0039] 300, piezoelectric vibration assembly; 310, fixed bar seat; 320, clamping ear seat. DETAILED DESCRIPTION

[0040] In order to make the objects, technical solutions and advantages of the present application clearer, further detailed description will be made to the present application with reference to the specific embodiments and the accompanying drawings. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0041] It is understood that the above description is only exemplary and is not intended to limit the scope of the present application.

[0042] The accompanying drawings will be described below. Figure 1-Figure 7 Some embodiments of the present application provide a tubular air conditioner heat exchanger. Embodiment 1

[0043] The present embodiment provides a tubular air conditioner heat exchanger, comprising:

[0044] The refrigerant box 100 is provided with a heat exchange pipe 110 on the inner side, and the inner cavity of the refrigerant box 100 is connected with both ends of the heat exchange pipe 110 to form a passage for circulating heat transfer of refrigerant;

[0045] The fin group 200 is provided with a sleeve hole 201 on the surface of the heat exchange pipe 110, and the fin group 200 comprises a plurality of double-layer composite fins arranged along the surface of the sleeve hole 201, each composite fin being composed of a first pressing fin 210 and a second pressing fin 220;

[0046] The piezoelectric vibration assembly 300 is arranged at both ends of the fin group 200 and used for high-frequency vibration cleaning of the surface of the fin group 200.

[0047] Fin micro-channel design: The first and second pressing plates 210 and 220 are fixedly connected by hot-press sintering or heat-conducting adhesive, and are provided with a plurality of backflow channels 212 on opposite surfaces and heat-conducting channels 213 arranged around the outer periphery of the sleeve hole 201, forming an internal micro-channel structure, and the micro-channels are filled with working medium such as water, ethanol or acetone. The backflow channels 212 and heat-conducting channels 213 formed by CNC processing have a size range of 10 microns to 500 microns, which ensures that the working medium completes efficient heat absorption vaporization and condensation backflow circulation in the channels.

[0048] Bionic outer surface design: One side of the first and second pressing plates 210 and 220 is provided with an outer cooling plate 202, and the backflow channels 212 are located on the inner side of the outer cooling plate 202. The outer surface of the fin group 200 is formed with micron-level bionic fish scale-shaped convex and concave wings by laser micro-machining or nano-imprinting process, and the height or depth range is 1 micron to 50 microns, which is used to destroy the fluid boundary layer effect and enhance the turbulent flow.

[0049] Piezoelectric vibration cleaning function: The piezoelectric vibration assembly 300 includes a fixed bar seat 310, a clamping ear seat 320, and a piezoelectric ceramic body fixed to the surface of the clamping ear seat 320. The clamping ear seat 320 is connected with the surface of the outer cooling plate 202 of the fin group 200 and is in contact with the thinnest surface of the outer cooling plate 202 to form a vibration effect through the elastic deformation of the outer cooling plate 202. High-frequency vibration is generated by the piezoelectric ceramic body to remove dust and particles on the surface of the fin group 200, and the working frequency range of the piezoelectric ceramic body is 20 kHz to 100 kHz.

[0050] Double-layer composite material optimization: The first pressing plate 210 is made of metal material such as copper or aluminum, and the second pressing plate 220 is made of ceramic material such as aluminum oxide or silicon nitride, which ensures high thermal conductivity and mechanical strength of the fin.

[0051] Working medium circulation path optimization: The backflow channels 212 and heat-conducting channels 213 are arranged obliquely downward, which facilitates the working medium of the heat pipe to flow back to the inside of the heat-conducting channels 213 after condensation by gravity, realizing natural circulation. Through the circulation path design of heat absorption vaporization and heat release condensation, the heat transfer efficiency and temperature uniformity of the heat pipe are significantly improved.

[0052] Electronic control system adjustment: The vibration time and frequency of the piezoelectric vibration assembly 300 are adjusted by the electronic control system to realize intermittent cleaning mode, further reducing energy consumption and prolonging the service life of the assembly.

[0053] Working process: The refrigerant enters the refrigerant box 100 from the heat exchange pipe 110, and transfers heat to the fin group 200. The working medium vaporizes by absorbing heat in the back-cooling flow channel 212, flows along the heat-conducting flow channel 213 to the edge heat dissipation condenser, and then flows back to the heat exchange pipe to form a heat pipe circulation. The enhanced turbulent flow effect of the wing convex surface 211 and the high-frequency vibration cleaning function of the piezoelectric vibration assembly 300 maintain high-efficiency heat exchange performance. Example 2

[0054] On the basis of Example 1, this embodiment is further optimized in design to adapt to complex working conditions, such as automobile cooling systems or industrial heat exchange equipment.

[0055] Fin group structure improvement: A dense fin group 200 is arranged on the sleeve hole 201, and the number of fins is increased to adapt to higher heat exchange requirements. The number of composite fins in the fin group 200 is increased by 30% compared to Example 1, further improving the overall heat transfer area and efficiency.

[0056] Working medium type and microchannel arrangement optimization: The channel arrangement form of the back-cooling flow channel 212 and the heat-conducting flow channel 213 adopts a zoned design, that is, the area close to the heat exchange pipe 110 is densely arranged with microchannels to quickly vaporize heat in the high-temperature zone; the area away from the heat exchange pipe 110 is sparsely arranged with microchannels to ensure smooth condensation. The working medium is selected as acetone due to its low latent heat of vaporization and high heat transfer efficiency.

[0057] Biomimetic surface multi-layer design: An additional super-hydrophobic coating is added to the outer surface of the fin group 200, further improving the anti-fouling and water-repellent properties of the surface, reducing the adhesion of external particulate matter and water droplets, reducing fluid resistance, and prolonging the service life.

[0058] Multi-stage piezoelectric vibration module: The number of vibration modules of the piezoelectric vibration assembly 300 is increased from 2 to 4, and is uniformly arranged along the arrangement direction of the fin group 200. Each module is independently adjusted in working time and frequency by an electronic control system, and the vibration frequency range is expanded to 50 kHz to 120 kHz to adapt to working conditions with higher dust concentration.

[0059] High-temperature-resistant structure enhancement: The first fin 210 and the second fin 220 are combined with high-thermal-conductivity copper and silicon nitride ceramic materials, and a high-temperature-resistant coating is added to the inner wall of the heat-conducting flow channel 213 to adapt to long-term use in high-temperature industrial environments.

[0060] Working process:

[0061] The refrigerant flows into the refrigerant box 100 through the heat exchange pipe 110, and transfers heat in the denser fin group 200. The complete fin structure is formed by the first pressing sheet 210 and the second pressing sheet 220, and the opposite inner side arranged back cooling flow channel 212 and heat conduction flow channel 213, and the working medium quickly completes the heat absorption vaporization and condensation backflow process, and the airflow turbulence enhancement structure of the wing convex surface 211 surface further improves the heat exchange efficiency. The combination of super-hydrophobic coating and multi-section vibration module ensures that the fin surface always remains clean and adapts to long-term work in harsh environments.

[0062] The working principle and use process of the present application are as follows:

[0063] The tubular air conditioner heat exchanger of the present application realizes high-efficiency heat exchange performance and long-term reliability by combining double-layer composite fins, micro-channel heat pipe technology, bionic surface design and piezoelectric vibration cleaning function. The working principle is as follows:

[0064] Heat transfer and convection heat exchange: The refrigerant enters the refrigerant box 100 from the heat exchange pipe 110, and the refrigerant flows in the refrigerant box 100 and transfers heat to the fin group 200 through the heat exchange pipe 110.

[0065] The composite fin in the fin group 200 is composed of the first pressing sheet 210 and the second pressing sheet 220, which rapidly spreads heat to the entire fin surface through its high thermal conductivity. The fin surface enhances turbulence, destroys the boundary layer, and improves the efficiency of convective heat transfer through the wing convex surface 211 of the bionic fish scale-shaped protrusions and grooves.

[0066] Heat pipe micro-channel circulation: The back cooling flow channel 212 and the heat conduction flow channel 213 inside the fin are formed by CNC machining and filled with heat pipe working medium such as water, ethanol or acetone. The working medium absorbs heat and vaporizes at one end near the heat exchange pipe 110, and flows to the edge or thinner part of the fin through the heat conduction flow channel 213. At the edge, the working medium cools and condenses and flows back to the heat exchange pipe 110 around the heat exchange pipe 110 through the back cooling flow channel 212, completing the cycle of heat absorption, vaporization, condensation and backflow, improving the heat conduction efficiency and temperature uniformity of the fin.

[0067] Bionic surface effect: The micron-level bionic fish scale-shaped protrusions and grooves on the surface of the fin group 200 simulate the texture of fish scales, destroy the laminar flow state of the airflow, enhance the airflow turbulence, and further improve the convective heat transfer performance.

[0068] Piezoelectric vibration cleaning function: The piezoelectric vibration assembly at both ends of the fin piezoelectric vibration assembly 300 utilizes the high-frequency vibration function of the piezoelectric ceramic body, and transmits the vibration to the fin surface through the connection of the fixed bar seat 310 and the ear seat 320. The vibration frequency range is 20k Hz to 100k Hz, which effectively removes dust and particulate matter from the fin surface, preventing it from affecting the heat exchange performance.

[0069] Electronic control and cleaning management: The vibration time and frequency of the piezoelectric vibration component 300 are adjusted by the electronic control system to achieve an intermittent cleaning mode, reducing energy consumption while ensuring the long-term efficient operation of the heat exchanger.

[0070] Throughout this specification, terms such as "one embodiment," "some embodiments," and "specific embodiments" mean that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, illustrative uses of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0071] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the claims and their equivalents.

Claims

1. A tubular air conditioning heat exchanger, characterized in that: include: A refrigerant box (100) is provided with a heat exchange tube (110) on its inner side, and the inner cavity of the refrigerant box (100) is connected to both ends of the heat exchange tube (110) to form a passage; a fin group (200), the surface of the fin group (200) is provided with a sleeve hole (201) sleeved on the surface of the heat exchange tube (110), including multiple groups of double-layer composite fins arranged along the surface of the sleeve hole (201), each group of composite fins is composed of a first pressing plate (210) and a second pressing plate (220); a piezoelectric vibration component (300) is provided at both ends of the fin group (200) for performing high-frequency vibration cleaning on the surface of the fin group (200); wherein the first pressure plate (210) is provided with a second pressure plate (220) for cleaning ... The sheet (210) and the second pressing sheet (220) are fixedly connected by hot pressing sintering or heat-conducting adhesive, and a plurality of return cooling channels (212) and a heat-conducting channel (213) arranged around the outer periphery of the sleeve hole (201) are provided on opposite surfaces thereof, forming an internal microchannel structure, and the microchannel is filled with a heat pipe working medium; an external cooling sheet (202) is provided on one side of the first pressing sheet (210) and the second pressing sheet (220), and the return cooling channel (212) is located on the inner side of the external cooling sheet (202); the outer surface of the fin group (200) is provided with a wing convex surface (211) with micron-scale bionic fish scale protrusions and grooves, which is used to increase turbulence and improve convective heat transfer efficiency; The outer surfaces of the first pressing plate (210) and the second pressing plate (220) are provided with wing convex surfaces (211), and the cross-section is wing-shaped to optimize the airflow velocity and disturb the fluid flow. The wing-shaped cross-section is optimized by computational fluid dynamics (CFD) to maximize the air flow and heat transfer efficiency. The outer surface of the fin group (200) is formed with bionic fish scale-like protrusions and grooves by laser micromachining or nanoimprinting technology, and the height or depth of the bionic fish scale-like protrusions and grooves ranges from 1 micron to 50 microns; The piezoelectric vibration assembly (300) comprises a fixed bar seat (310), a clamping ear seat (320), and a piezoelectric ceramic body fixed to the surface of the clamping ear seat (320); the clamping ear seat (320) is connected to the surface of the outer cooling plate (202) of the fin group (200); high-frequency vibration is generated by the piezoelectric ceramic body to remove dust and particles on the surface of the fin group (200); the operating frequency of the piezoelectric ceramic body is 20 kHz to 100 kHz; The first pressing plate (210) of the fin group (200) is made of a metal material, and the second pressing plate (220) is made of a ceramic material. The metal material is copper or aluminum, and the ceramic material is aluminum oxide or silicon nitride.

2. A tubular air-conditioning heat exchanger according to claim 1, characterized in that: The size range of the cooling channel (212) and the heat conduction channel (213) is 10 microns to 500 microns, and the working medium of the heat pipe is water, ethanol or acetone.

3. The tubular air-conditioning heat exchanger according to claim 1, characterized in that: The cooling channel (212) and the heat transfer channel (213) are arranged obliquely downward, so that the heat pipe working medium can flow back to the inside of the heat transfer channel (213) by gravity after condensation. The heat pipe working medium circulates and transfers heat in the cooling channel (212) and the heat transfer channel (213) through heat absorption vaporization and heat release condensation.

4. The tubular air-conditioning heat exchanger according to claim 1, characterized in that: The vibration time and frequency of the piezoelectric vibration component (300) are adjusted by an electronic control system to achieve an intermittent cleaning mode.

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