Tubular air conditioner heat exchanger

Abstract

The tubular air conditioner heat exchanger comprises a refrigerant box, a heat exchange tube is arranged on the inner side of the refrigerant box, and an inner cavity of the refrigerant box is connected with the two ends of the heat exchange tube to form a passage; the surface of the fin set is provided with a sleeve hole connected to the surface of the heat exchange tube in a sleeved mode, the fin set comprises a plurality of sets of double-layer composite fins arranged along the surface of the sleeve hole, and each set of composite fins is formed by combining a first pressing piece and a second pressing piece. The piezoelectric vibration assemblies are arranged at the two ends of the fin set and used for conducting high-frequency vibration cleaning on the surface of the fin set. According to the invention, the opposite surfaces of the double-layer fin group are integrated with micro fluid channels by utilizing CNC (Computer Numerical Control) processing, and are filled with a heat pipe working medium (such as water, ethanol or acetone), and the working medium absorbs heat and is vaporized at one end, close to the heat exchange pipe, of the fin, flows towards the edge or thinner part of the fin, dissipates heat and condenses, and then flows back to the periphery of the heat exchange pipe to form circulation; and the heat conduction efficiency and the temperature uniformity of the fins are remarkably improved by effectively utilizing the heat pipe technology.

Description

Technical Field

[0001] The invention relates to the technical field of air-conditioning heat exchangers, in particular to a tubular air-conditioning heat exchanger. Background Art

[0002] At present, traditional air conditioning heat exchangers generally adopt a structure combining single-layer fins and heat exchange tubes, in which the fins are usually made of metal materials (such as aluminum or copper), and the heat inside the refrigerant tube is transferred to the outside air through the thermal conductivity of the fins. However, in this structural design, the shape of the fins is mostly simple flat sheets, and heat exchange is completed only by natural convection and the thermal conductivity of metal materials. In addition, the surface of the fins lacks special treatment, and dust and particulate matter are easily accumulated during long-term use, affecting the heat exchange efficiency. At the same time, the fin design mostly relies on a single material, which is limited by the material properties and it is difficult to take into account both thermal conductivity and mechanical strength.

[0003] However, the existing traditional technical solutions have the following defects: Limited heat transfer efficiency: The heat transfer of the traditional single-layer fin structure mainly depends on the thermal conductivity of the fin material, but the thermal contact area between the fin and the heat exchange tube is limited, and a more efficient heat conduction path cannot be achieved inside the fin. It is impossible to use heat pipe technology to achieve rapid heat transfer and uniform distribution, which can easily cause local overheating or uneven temperature.

[0004] Insufficient convective heat transfer effect: The flat sheet structure of traditional fins makes it difficult to effectively disturb the airflow, and the existence of the fluid laminar state greatly limits the convective heat transfer efficiency. In addition, the fin surface has not been specially treated, making it difficult to enhance the fluid turbulence or destroy the boundary layer effect, and the heat transfer performance cannot be further improved.

[0005] Poor mechanical properties of fins: Traditional fins are mostly made of a single metal material. Although they have certain thermal conductivity, the material's high-temperature strength, corrosion resistance, and long-term reliability are difficult to meet the needs of complex working conditions. The fins are susceptible to fatigue damage or environmental corrosion, resulting in a shortened service life.

[0006] High maintenance cost: Traditional heat exchangers lack dust-proof design. Dust and particulate matter easily accumulate on the fin surface during long-term operation, resulting in reduced heat transfer performance. Regular shutdown for manual cleaning is required, which increases maintenance costs and interruptions in operating time.

[0007] In view of the defects of the above-mentioned traditional technical solutions, the present invention proposes a tubular air-conditioning heat exchanger with higher heat exchange efficiency, more reliable structural performance and lower maintenance cost by combining heat pipe technology, double-layer composite fin structure, bionic surface design and piezoelectric vibration cleaning function, so as to solve the problems in the prior art. Summary of the invention

[0008] The present invention provides a tubular air-conditioning heat exchanger, which improves heat exchange efficiency, structural reliability and dustproof performance by optimizing the structural design of a refrigerant box, a heat exchange tube, a fin group and a piezoelectric vibration component.

[0009] The tubular air conditioning heat exchanger comprises: Basic structure: A refrigerant box, the inner side of which is provided with a heat exchange tube, and the inner cavity of the refrigerant box is connected to both ends of the heat exchange tube to form a passage; A fin group, wherein the surface of the fin group is provided with a sleeve hole which is sleeved on the surface of the heat exchange tube, and comprises a plurality of groups of double-layer composite fins arranged along the surface of the sleeve hole, and each group of composite fins is composed of a first pressing sheet and a second pressing sheet; A piezoelectric vibration component is arranged at both ends of the fin group and is used for high-frequency vibration cleaning of the surface of the fin group; Among them, the first pressing plate and the second pressing plate are fixedly connected by hot pressing sintering or heat-conducting adhesive, and a plurality of return cooling channels and heat-conducting channels arranged around the outer periphery of the sleeve hole are arranged on the opposite surfaces thereof to form an internal microchannel structure, and the microchannel is filled with heat pipe working medium; an external cold plate is arranged on one side of the first pressing plate and the second pressing plate, and the return cooling channel is located on the inner side of the external cold plate, and the outer surface of the fin group is provided with a wing convex surface with micron-scale bionic fish scale protrusions and grooves, which is used to increase turbulence and improve convective heat transfer efficiency. The above design realizes efficient heat conduction through the circulation of the heat pipe working medium inside the return cooling channel and the heat-conducting channel, and at the same time, the wing convex surface of the bionic fish scale protrusions and grooves significantly improves the airflow disturbance effect and improves the heat exchange efficiency.

[0010] Optimized air flow velocity design: The outer surfaces of the first and second pressing plates are provided with wing convex surfaces with wing-shaped cross sections, which optimize the air flow velocity and disturb the fluid flow. The wing-shaped cross section is optimized by computational fluid dynamics (CFD) to maximize air flow and heat transfer efficiency. The wing-shaped cross section design enhances the surface air flow velocity, destroys the laminar flow state of the fluid, forms turbulence, and further improves the convective heat transfer efficiency.

[0011] Microchannel size and working medium: The size of the return cooling channel and the heat transfer channel ranges from 10 microns to 500 microns, and the heat pipe working medium is water, ethanol or acetone. By controlling the size of the return cooling channel and the heat transfer channel microchannel and filling the working medium, the heat pipe medium absorbs heat, vaporizes, condenses and refluxes efficiently, and further improves the thermal conductivity of the fins.

[0012] Bionic surface process optimization: The outer surface of the fin group is formed with bionic fish scale-like protrusions and grooves by laser micromachining or nano-imprinting process, and the height or depth of the bionic fish scale-like protrusions and grooves ranges from 1 micron to 50 microns. The bionic fish scale structure significantly improves the convective heat transfer efficiency by enhancing the surface turbulence, and the surface protrusions and grooves help reduce the adhesion of pollutants.

[0013] Piezoelectric vibration assembly: The piezoelectric vibration assembly includes a fixed bar seat, a clamping ear seat, and a piezoelectric ceramic body fixed to the surface of the clamping ear seat. The clamping ear seat is connected to the surface of the outer cold plate of the fin group. The piezoelectric ceramic body generates high-frequency vibration to remove dust and particles on the surface of the fin group. The operating frequency of the piezoelectric ceramic body is 20k Hz to 100k Hz. Through the piezoelectric vibration function of the piezoelectric vibration assembly, dust and particles on the surface of the fin are effectively removed by high-frequency vibration, maintaining long-term heat exchange efficiency and reducing cleaning and maintenance costs.

[0014] Double-layer composite fin material optimization: The first pressing plate of the fin group is made of metal material, and the second pressing plate is made of ceramic material. The metal material is copper or aluminum, and the ceramic material is alumina or silicon nitride. The combination of metal material and ceramic material not only ensures high thermal conductivity, but also enhances the mechanical strength and long-term reliability of the fin structure.

[0015] Optimization of the flow direction of the heat pipe working medium: The cooling channel and the heat transfer channel are arranged obliquely downward, which facilitates the gravity return of the heat pipe working medium to the inside of the heat transfer channel after condensation. The heat pipe working medium circulates and transfers heat in the cooling channel and the heat transfer channel through heat absorption vaporization and heat release condensation. Through the oblique downward arrangement design, the working medium uses gravity to achieve natural reflux, optimizes the efficiency of the heat pipe cycle, and further improves the overall heat transfer effect.

[0016] Electronic control system cleaning mode: The vibration time and frequency of the piezoelectric vibration component are adjusted by the electronic control system to achieve an intermittent cleaning mode. Through the electronic control system, the vibration time and frequency of the piezoelectric vibration component are intermittently adjusted to ensure that the fin surface remains clean while reducing energy consumption.

[0017] 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.

[0018] The beneficial effects achieved by the present invention are: 1. In the present invention, micro fluid channels are integrated on opposite sides of the double-layer fin group 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 of the fin close to the heat exchange tube, flows to the edge or thinner part of the fin to dissipate heat and condense, and then flows back to the periphery of the heat exchange tube to form a circulation, effectively utilizing the heat pipe technology to significantly improve the thermal conductivity and temperature uniformity of the fin.

[0019] 2. In the present invention, micron-scale bionic fish-scale protrusions and grooves and wing-shaped wing 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 degree of fluid turbulence, which 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.

[0020] 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, and the high thermal conductivity of the metal and the high strength and high temperature resistance of the ceramic are fully utilized, thereby optimizing the heat transfer efficiency and enhancing the mechanical properties and long-term reliability of the fins.

[0021] 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 utilized to effectively prevent dust and particles from adhering to the surface of the fins, thereby maintaining the long-term high-efficiency heat exchange performance of the fins and reducing the cost of cleaning and maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present invention; Figure 2 A schematic diagram of the decomposed structure of an embodiment of the present invention; 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; Figure 4 It is a schematic diagram of the surface structure of a fin group according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the cross-sectional structure of a fin assembly according to an embodiment of the present invention; 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; Figure 7 For an embodiment of the present invention Figure 6 Schematic diagram of the structure at point A.

[0023] Reference numerals: 100. refrigerant box; 110. heat exchange tube; 200, fin group; 201, sleeve hole; 202, external cooling fin; 210, first pressing plate; 220, second pressing plate; 211, wing convex surface; 212, return cooling channel; 213, heat transfer channel; 300, piezoelectric vibration component; 310, fixed bar seat; 320, ear clamp seat. DETAILED DESCRIPTION

[0024] To make the purpose, technical solution and advantages of the present invention more clear, the present invention is further described in detail below in combination with specific implementations and with reference to the accompanying drawings. It should be noted that the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

[0025] It is to be understood that these descriptions are exemplary only and are not intended to limit the scope of the invention.

[0026] The following is combined with Figure 1-Figure 7 A tubular air-conditioning heat exchanger provided in some embodiments of the present invention is described. Example 1

[0027] This embodiment provides a tubular air-conditioning heat exchanger, comprising: A refrigerant box 100 is provided with a heat exchange tube 110 inside thereof, and the inner cavity of the refrigerant box 100 is connected with both ends of the heat exchange tube 110 to form a passage for circulating heat transfer of the refrigerant; The fin group 200 has a sleeve hole 201 on its surface which is sleeved on the surface of the heat exchange tube 110, and includes a plurality of groups of double-layer composite fins arranged along the surface of the sleeve hole 201, and each group of composite fins is composed of a first pressing sheet 210 and a second pressing sheet 220; The piezoelectric vibration assembly 300 is disposed at both ends of the fin assembly 200 and is used to perform high-frequency vibration cleaning on the surface of the fin assembly 200 .

[0028] Fin microchannel design: The first pressing plate 210 and the second pressing plate 220 are fixedly connected by hot pressing sintering or heat-conducting adhesive, and a plurality of return cooling channels 212 and heat-conducting channels 213 arranged around the outer periphery of the sleeve hole 201 are arranged on the opposite surfaces thereof, forming an internal microchannel structure, and the microchannel is filled with working medium such as water, ethanol or acetone. The return cooling channels 212 and heat-conducting channels 213 formed by CNC processing have a size range of 10 microns to 500 microns, ensuring that the working medium completes efficient heat absorption vaporization and condensation reflux cycle in the channel.

[0029] Bionic outer surface design: An outer cooling fin 202 is provided on one side of the first pressing plate 210 and the second pressing plate 220, and the return cooling channel 212 is located on the inner side of the outer cooling fin 202. The outer surface of the fin group 200 is formed with a wing convex surface 211 with micron-scale bionic fish scale-like protrusions and grooves by laser micromachining or nano-imprinting technology, and the height or depth ranges from 1 micron to 50 microns, which is used to destroy the fluid boundary layer effect and enhance turbulence.

[0030] Piezoelectric vibration cleaning function: The piezoelectric vibration component 300 includes a fixed bar seat 310, a clamping ear seat 320 and a piezoelectric ceramic body fixed on the surface of the clamping ear seat 320. The clamping ear seat 320 is connected to the surface of the external cooling plate 202 of the fin group 200, and contacts the surface of the thinnest external cooling plate 202 to form a vibration effect through the elastic deformation of the external cooling plate 202. High-frequency vibration is generated through the piezoelectric ceramic body to remove dust and particulate matter on the surface of the fin group 200. The operating frequency range of the piezoelectric ceramic body is 20k Hz to 100k Hz.

[0031] 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 alumina or silicon nitride, to ensure high thermal conductivity and mechanical strength of the fin.

[0032] Optimization of working medium circulation path: The cold return channel 212 and the heat transfer channel 213 are arranged obliquely downward, so that the working medium of the heat pipe can flow back to the inner side of the heat transfer channel 213 by gravity after condensation, thus realizing natural circulation. The heat transfer efficiency and temperature uniformity of the heat pipe are significantly improved through the circulation path design of heat absorption vaporization and heat release condensation.

[0033] Electronic control system adjustment: The vibration time and frequency of the piezoelectric vibration component 300 are adjusted by the electronic control system to achieve an intermittent cleaning mode, further reducing energy consumption and extending component life.

[0034] Working process: The refrigerant enters the refrigerant box 100 from the heat exchange tube 110 and transfers heat to the fin group 200. The working medium absorbs heat and vaporizes in the return cold channel 212, flows along the heat conduction channel 213 to the edge to dissipate heat and condense, and then flows back to the heat exchange tube to form a heat pipe cycle. The turbulence effect enhanced by the wing convex surface 211 and the high-frequency vibration cleaning function of the piezoelectric vibration component 300 maintains efficient heat exchange performance. Example 2

[0035] Based on Example 1, this example further optimizes the design to be applicable to complex working conditions, such as automobile cooling systems or industrial heat exchange equipment.

[0036] Improved fin assembly structure: a dense fin group 200 is arranged on the sleeve hole 201, and the number of fins is increased to meet higher heat exchange requirements. The number of composite fins in a group of the fin group 200 is increased by 30% compared with Example 1, further improving the overall heat transfer area and efficiency.

[0037] Optimization of working medium type and microchannel arrangement: The channel arrangement of the return cooling channel 212 and the heat transfer channel 213 adopts a partition design, that is, the area close to the heat exchange tube 110 is a dense microchannel arrangement, so that it can quickly absorb heat and vaporize in the high temperature area; the area far away from the heat exchange tube 110 adopts a sparse microchannel arrangement to ensure a smooth condensation process. Acetone is selected as the working medium because of its low latent heat of vaporization and high heat transfer efficiency.

[0038] Bionic surface multi-layer design: An additional layer of super hydrophobic coating is added to the outer surface of the fin group 200 to further enhance the surface's anti-fouling and waterproof properties, reduce the attachment of external particles and water droplets, reduce fluid resistance and extend service life.

[0039] Multi-stage piezoelectric vibration module: The number of vibration modules of the piezoelectric vibration assembly 300 is increased from 2 to 4, and is evenly arranged along the arrangement direction of the fin group 200. Each module independently adjusts the working time and frequency through an electronic control system, and the vibration frequency range is expanded to 50k Hz to 120k Hz to adapt to working conditions with higher dust concentrations.

[0040] Enhanced high temperature resistant structure: The first pressing plate 210 and the second pressing plate 220 are made of a combination of high thermal conductivity copper and silicon nitride ceramic materials, and a high temperature resistant coating is added to the inner wall of the heat conduction channel 213 to adapt to long-term use in high temperature industrial environments.

[0041] Working process: The refrigerant flows into the refrigerant box 100 through the heat exchange tube 110 and transfers heat in the denser fin group 200. The first pressing plate 210 and the second pressing plate 220 are combined to form a complete fin structure, and the return cooling channel 212 and the heat conduction channel 213 are arranged on the inner side. The working medium quickly completes the heat absorption vaporization and condensation reflux process, and the airflow turbulence enhancement structure on the surface of the wing convex surface 211 further improves the heat exchange efficiency. The combination of the super hydrophobic coating and the multi-stage vibration module ensures that the fin surface is always kept clean and adapts to long-term work in harsh environments.

[0042] The working principle and use process of the present invention: The tubular air-conditioning heat exchanger of the present invention achieves efficient heat exchange performance and long-term reliability by combining double-layer composite fins, microchannel heat pipe technology, bionic surface design and piezoelectric vibration cleaning function. Its working principle is as follows: Heat transfer and convection heat transfer: The refrigerant enters the refrigerant box 100 from the heat exchange tube 110 , and the refrigerant flows in the inner cavity of the refrigerant box 100 and transfers heat to the fin group 200 through the heat exchange tube 110 .

[0043] The composite fin in the fin assembly 200 is composed of a first pressing plate 210 and a second pressing plate 220. The high thermal conductivity of the composite fin rapidly diffuses heat to the entire fin surface. The fin surface has a wing convex surface 211 with bionic fish scale-like protrusions and grooves to enhance turbulence, destroy the boundary layer, and improve the convective heat transfer efficiency.

[0044] Heat pipe microchannel circulation: The return cooling channel 212 and the heat conduction 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 the end close to the heat exchange tube 110, and flows to the edge or thinner part of the fin through the heat conduction channel 213. At the edge, the working medium dissipates heat and condenses and flows back to the heat exchange tube 110 through the return cooling channel 212, completing the cycle of heat absorption, vaporization, condensation and reflux, thereby improving the thermal conductivity and temperature uniformity of the fin.

[0045] Bionic surface effect: The wing convex surface 211 with micron-scale bionic fish-scale-like protrusions and grooves on the surface of the fin group 200 simulates the fish-scale texture, destroys the laminar state of the airflow, enhances the turbulence of the airflow, and further improves the convective heat transfer performance.

[0046] Piezoelectric vibration cleaning function: The piezoelectric vibration components 300 at both ends of the fin utilize the high-frequency vibration function of the piezoelectric ceramic body to transmit the vibration to the fin surface through the connection between the fixed bar seat 310 and the clamp ear seat 320. The vibration frequency range is 20k Hz to 100k Hz, which can effectively remove dust and particles on the fin surface to prevent it from affecting the heat exchange performance.

[0047] Electronic control and cleaning management: By adjusting the vibration time and frequency of the piezoelectric vibration component 300 through the electronic control system, an intermittent cleaning mode can be achieved, which reduces energy consumption while ensuring that the heat exchanger maintains efficient operation for a long time.

[0048] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0049] 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 present invention, and that the scope of the present 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) having a heat exchange tube (110) disposed inside thereof, wherein the inner cavity of the refrigerant box (100) and two ends of the heat exchange tube (110) are connected to form a passage; A fin group (200), wherein a sleeve hole (201) sleeved on the surface of the heat exchange tube (110) is provided on the surface of the fin group (200), and comprises a plurality of groups of double-layer composite fins arranged along the surface of the sleeve hole (201), and each group of composite fins is composed of a first pressing sheet (210) and a second pressing sheet (220); A piezoelectric vibration component (300) is arranged at both ends of the fin group (200) and is used to perform high-frequency vibration cleaning on the surface of the fin group (200); The first pressing plate (210) and the second pressing plate (220) are fixedly connected by hot pressing sintering or heat-conducting adhesive, and a plurality of return cooling channels (212) and heat-conducting channels (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 plate (202) is provided on one side of the first pressing plate (210) and the second pressing plate (220), and the return cooling channel (212) is located on the inner side of the external cooling plate (202); and a wing convex surface (211) with micron-scale bionic fish scale-like protrusions and grooves is provided on the outer surface of the fin group (200) to increase turbulence and improve convective heat transfer efficiency.

2. A tubular air conditioning heat exchanger according to claim 1, characterized in that: The outer surfaces of the first pressing plate (210) and the second pressing plate (220) are provided with wing convex surfaces (211) with wing-shaped cross-sections to optimize airflow velocity and disturb fluid flow. The wing-shaped cross-sections are optimized by computational fluid dynamics (CFD) to maximize air flow and heat transfer efficiency.

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

4. A tubular air conditioning heat exchanger according to claim 1, characterized in that: The outer surface of the fin group (200) is formed with bionic fish scale-like protrusions and grooves by laser micromachining or nano-imprinting technology, and the height or depth of the bionic fish scale-like protrusions and grooves ranges from 1 micrometer to 50 micrometers.

5. The tubular air conditioning heat exchanger according to claim 1, characterized in that: The piezoelectric vibration component (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 an external 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.

6. A tubular air conditioning heat exchanger according to claim 1, characterized in that: 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.

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

8. 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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