A compact evaporator fin structure for an air source heat pump unit

Abstract

The application belongs to the refrigeration technical field, and specifically discloses a compact evaporator fin structure for an air source heat pump unit, which comprises fin plates and connecting pipes penetrating through the fin plates, support plates are detachably connected to the connecting pipes on the two sides of the fin plates, a plurality of fin plates are fixed on the connecting pipes through penetrating rods, the fin plate comprises a first plate body and a second plate body, the first plate body is seamlessly welded on the second plate body, a plurality of flow distribution blocks are fixed on the outer sides of the first plate body and the second plate body in the vertical direction, a baffle is fixed on the outer sides of the first plate body and the second plate body at the upper part and the lower part, and flow guide parts are arranged on the two sides of the flow distribution blocks. Through the synergistic effect of active frost inhibition and flow guiding, dust prevention and vibration ash removal dual self-cleaning of the structure, and multi-stage flow guiding for optimizing the flow field, the problems of frost formation, dust accumulation coupling and uneven flow field around the penetrating holes of the heat exchange pipes are effectively solved, and long-term and efficient heat exchange of the compact evaporator under the compact structure is realized.

Description

Technical Field

[0001] This invention belongs to the field of refrigeration technology, and specifically discloses a compact evaporator fin structure for air source heat pump units. Background Technology

[0002] As a highly efficient and energy-saving heating and cooling device, the evaporator of an air source heat pump is the core component for heat exchange. The evaporator typically consists of multiple sets of fins and heat exchange tubes interspersed within the fins. The fins increase the contact area with the air, thereby improving heat exchange efficiency. During heat pump operation, liquid refrigerant flows within the heat exchange tubes, absorbing heat from the air flowing through the evaporator via the fins, thus achieving heat transfer.

[0003] However, the existing air source heat pump evaporator fin structure has the following technical defects in practical applications: 1. Frost easily forms around the heat exchange tubes, affecting heat exchange efficiency. In winter heating conditions, the evaporator surface temperature is usually lower than the dew point temperature of the ambient air, causing moisture in the air to condense into frost on the fins and heat exchange tube surfaces. The connection between the heat exchange tubes and fins (i.e., around the through holes) is particularly prone to severe frost formation due to thermal bridging and uneven local temperature distribution. The frost layer not only increases heat transfer resistance but also clogs the fin gaps, obstructing airflow, reducing air volume, and drastically decreasing heat exchange efficiency. Studies show that severe frost formation reduces the evaporator's heat exchange capacity, requiring frequent defrosting operations and significantly lowering the overall energy efficiency ratio (COP) of the heat pump unit.

[0004] Second, poor condensate drainage easily leads to the formation of "water bridges" and residual water droplets. Existing fin structures often use hydrophilic coatings to improve surface wettability, but lack active flow guidance designs. Condensate generated during defrosting is difficult to quickly and thoroughly drain from the fin surface, especially from the root of the heat exchange tubes, easily forming "water bridges" or residual water droplets in the fin gaps. This residual moisture will rapidly refreeze at low temperatures, not only exacerbating frosting during subsequent operation but also causing localized corrosion of the fins and shortening the equipment's lifespan.

[0005] Third, dust easily accumulates on the fin surface, lacking self-cleaning ability. Evaporators are exposed to the outdoor environment for extended periods, making it easy for dust and particulate matter in the air to adhere to the fin surface. This dust accumulation not only increases heat transfer resistance but also clogs the fin gaps, increasing airflow resistance and fan energy consumption. More seriously, dust accumulation and frosting have a coupling effect: the dusty surface more easily absorbs moisture, significantly worsening the frosting process and drastically reducing the fin's anti-frost performance. Existing fin structures generally lack self-cleaning capabilities; accumulated dust is difficult to remove on its own, leading to a continuous decline in heat exchange efficiency over long-term operation. Furthermore, manual cleaning and maintenance are costly and inconvenient.

[0006] Fourth, uneven airflow distribution and insufficient utilization of heat exchange area: In traditional finned structures, airflow often encounters dead zones or uneven velocity distribution as it passes over the fin surface. The area around the heat exchange tubes experiences a lower local heat transfer coefficient due to airflow around the tubes, resulting in underutilization of the heat exchange area. This is especially true in compact designs where reduced fin spacing increases airflow resistance and makes it even more difficult to ensure flow field uniformity, further hindering the improvement of heat exchange performance.

[0007] Fifth, the coupling effect of frosting and dust accumulation exacerbates performance degradation. In existing technologies, frosting and dust accumulation are usually considered separately, lacking an integrated solution. However, in actual operation, dust accumulation on the surface exacerbates frosting, and the residual moisture during the frosting and defrosting process further promotes dust adhesion, creating a vicious cycle. This coupling effect causes the long-term performance degradation of the evaporator to be far greater than theoretical predictions, severely impacting the service life and energy efficiency of the heat pump unit.

[0008] In summary, existing air source heat pump evaporator fin structures still have significant shortcomings in terms of preventing frost formation around the heat exchange tubes, condensate drainage, self-cleaning of accumulated dust, and flow field uniformity. Therefore, developing a compact evaporator fin structure that can effectively solve the problem of frost formation around the heat exchange tube through-holes, achieve rapid condensate drainage, and possess self-cleaning capabilities is of great significance for improving the heat exchange efficiency of air source heat pumps, extending equipment lifespan, and reducing maintenance costs. Summary of the Invention

[0009] In view of this, the purpose of the present invention is to provide a compact evaporator fin structure for air source heat pump units to solve the problems mentioned above.

[0010] To achieve the above objectives, the present invention provides a compact evaporator fin structure for an air source heat pump unit, including fins and connecting pipes penetrating the fins. Support plates are detachably connected to the connecting pipes on both sides of the fins. Multiple fins are distributed, and multiple fins are fixed to the connecting pipes by through rods. The fin plate includes a first plate and a second plate. The first plate is seamlessly welded to the second plate. Multiple diversion blocks are fixed vertically on the outer sides of the first and second plates. Baffles are fixed on the upper and lower parts of the outer sides of the first and second plates. Both sides of the flow divider block are provided with flow guides. The windward surfaces of the first plate and the second plate are provided with protrusions near the front of the flow divider block. The protrusions are used to drive the airflow into the interior of the flow guides.

[0011] In the above technical solution, the edges of the baffle, the protrusion and the diverter are all rounded, the guide part is a horn-shaped structure with a large opening at the front and a small opening at the rear, and the fin plate is provided with through holes at the front and rear of the guide part, and the connecting pipe passes through the through holes to the fin plate.

[0012] In the above technical solution, the diverter block is further defined as a hemispherical structure, and the surface of the diverter block is provided with protrusions in an array. A groove is provided on the diverter block between two adjacent protrusions.

[0013] In the above technical solution, the protrusion is a hemispherical structure, the groove is a concave spherical groove structure, and the diverter block, protrusion and groove are coated with a hydrophobic coating.

[0014] In the above technical solution, the surfaces of the first plate, the second plate, the stop block and the protrusion are also coated with a hydrophobic coating. The inner walls of the first plate and the second plate are provided with cavities near the diverter block. The cavities on the first plate and the second plate form a sealed cavity structure.

[0015] In the above technical solution, a heat-absorbing medium is placed inside the cavity, and a plurality of fixing strips are fixed to the inner wall of the cavity, and a heat-bending strip is fixed to the side of each fixing strip near the inner wall of the cavity.

[0016] In the above technical solution, further, a baffle is fixed to the outer wall of the flow guide behind the rear through hole, and a flow guide is fixed to the flow guide behind the front through hole. Both the flow guide and the baffle can guide the air inside the flow guide.

[0017] In the above technical solution, the flow guide includes a flow guide strip fixed inside the flow guide section, a flow divider strip fixed behind the flow guide strip on the flow guide section, a guide strip fixed behind the flow divider strip on the flow guide section, and an air collecting strip fixed behind the guide strip on the flow guide section. The flow guide strip, flow divider strip, guide strip, air collecting strip, and baffle strip are all arc-shaped strip structures.

[0018] In the above technical solution, further, the height of the guide strip is lower than the height of the diverter strip, the height of the diverter strip is lower than the height of the guide strip, the height of the guide strip is lower than the height of the gas collecting strip, the height of the gas collecting strip is lower than the height of the baffle strip, the height of the baffle strip is lower than the depth of the guide section, and the length of the guide strip, diverter strip, guide strip, gas collecting strip and baffle strip is shorter than the width of the guide section.

[0019] Compared with the prior art, the present invention has the following beneficial effects: 1. This invention, by incorporating a flow guide on the fins and connecting the connecting pipe to the flow guide through a through-hole, allows external air to actively carry away water droplets condensed around the through-hole when air passes through the flow guide. This significantly reduces the risk of frost formation at the contact point between the connecting pipe and the fins. Furthermore, the flow guide employs a trumpet-shaped structure with a large front opening and a small rear opening, increasing the airflow velocity and quickly discharging the separated droplets from the flow guide, preventing droplets from lingering or flowing back around the fins. Simultaneously, the stepped flow guide structure, consisting of flow guide strips, diversion strips, guide strips, air collecting strips, and baffles within the flow guide, provides multiple guidance and acceleration of the airflow, ensuring effective removal of droplets around the through-hole. This effectively suppresses heat exchange attenuation caused by frost clogging the fin gaps, enabling the compact evaporator to maintain efficient and stable heat exchange performance even under low-temperature and high-humidity conditions.

[0020] 2. This invention features hemispherical protrusions and spherical grooves on the surface of the distribution block, with the protrusions and grooves interlacing to form a honeycomb structure. This structure increases the contact area between the distribution block and the external air, improving heat exchange efficiency. Furthermore, the combination of protrusions and grooves effectively separates airborne droplets and dust, preventing their deposition on the distribution block surface. In addition, the fins contain a sealed cavity structure consisting of two concave chambers. The cavity is filled with a heat-absorbing medium and has multiple heat-bending strips fixed inside. When the heat-absorbing medium absorbs heat transferred to the fins from the external heating structure, and the heat absorbed by the heat-bending strips reaches a specific temperature range, the heat-bending strips deform and generate minute impacts on the inner wall of the concave chambers. This causes periodic micro-vibrations on the outer wall of the distribution block, allowing dust and droplets adhering to the surface of the distribution block to detach under inertia. This ensures the fins remain clean during long-term use, preventing increased thermal resistance and frosting problems caused by dust accumulation, significantly extending the effective service life of the compact evaporator.

[0021] 3. This invention features multiple spherical diverting blocks vertically arranged on the surface of the fin, with protrusions at the front of each block and guide sections distributed on both sides. The protrusions work in conjunction with the diverting blocks to initially divert external air, guiding the airflow into the guide sections to form an orderly airflow channel. The protrusions and grooves on the surface of the diverting blocks further enhance the turbulence effect, ensuring full contact between the air and the fin. The guide strips, diverting strips, guide strips, air collecting strips, and baffles inside the guide section form a multi-stage guide structure. The height of each guide element increases in a stepped manner, enabling progressive compression and acceleration of the airflow, ensuring uniform distribution of air within the guide section and thorough scouring of the fin surface. Simultaneously, baffles at the upper and lower parts of the fin restrict airflow overflow, ensuring that the air flows along a pre-defined heat exchange path. Therefore, the fins shown in this invention can achieve a uniform distribution of the airflow field, eliminate the dead zone of airflow on the fins, and make full use of the heat exchange area of ​​the fins. Under the condition of compact structural design, the refrigerant heat exchange efficiency inside the compact evaporator is maximized. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the structure of the finned plate in this invention; Figure 3 for Figure 2 A partial schematic diagram; Figure 4 This is a schematic diagram showing the separation of the first plate and the second plate in this invention; Figure 5 for Figure 3 Side front view; Figure 6 for Figure 3 Enlarged view of A in the middle; Figure 7 for Figure 4 Enlarged view of B in the middle; Figure 8 This is a diagram showing the connection structure between the hot bending strip and the fixing strip in this invention.

[0023] 1. Connecting pipe; 11. Support plate; 12. Through rod; 2. Fin plate; 21. First plate; 22. Second plate; 23. Through hole; 24. Stop block; 25. Protrusion; 3. Diverter block; 31. Protrusion; 32. Groove; 4. Guide section; 41. Baffle strip; 5. Guide component; 51. Guide strip; 52. Diverter strip; 53. Guide strip; 54. Air collection strip; 6. Cavity; 61. Fixing strip; 62. Hot bending strip. Detailed Implementation

[0024] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0025] Numerous specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and therefore the invention is not limited to the specific embodiments disclosed below.

[0026] Example 1: Please refer to Figures 1-8 As shown, the present invention provides a technical solution: The present invention is a compact evaporator fin structure for an air source heat pump unit, including fins 2 and connecting pipes 1 passing through the fins 2. Support plates 11 are detachably connected to the connecting pipes 1 on both sides of the fins 2. Multiple fins 2 are distributed, and multiple fins 2 are fixed to the connecting pipes 1 by through rods 12. The fin plate 2 includes a first plate 21 and a second plate 22. The first plate 21 is seamlessly welded to the second plate 22. Multiple diversion blocks 3 are fixed vertically on the outer sides of the first plate 21 and the second plate 22. Baffles 24 are fixed on the upper and lower parts of the outer sides of the first plate 21 and the second plate 22. Both sides of the flow divider block 3 are provided with flow guides 4. The windward surfaces of the first plate 21 and the second plate 22 are provided with protrusions 25 near the front of the flow divider block 3. The protrusions 25 are used to drive the airflow into the interior of the flow guides 4.

[0027] The edges of the baffle 24, the protrusion 25 and the diverter block 3 are all rounded. The guide section 4 is a horn-shaped structure with a large opening at the front and a small opening at the rear. The fin plate 2 has through holes 23 at the front and rear of the guide section 4. The connecting pipe 1 passes through the through holes 23 and passes through the fin plate 2.

[0028] The diverter block 3 has a hemispherical structure. The surface of the diverter block 3 is provided with protrusions 31 in an array. A groove 32 is provided on the diverter block 3 between two adjacent protrusions 31.

[0029] The protrusion 31 is a hemispherical structure, and the groove 32 is a concave spherical groove structure. The diverter block 3, the protrusion 31 and the groove 32 are coated with a hydrophobic coating.

[0030] The surfaces of the first plate 21, the second plate 22, the baffle 24, and the protrusion 25 are also coated with a hydrophobic coating. The hydrophobic coating can prevent droplets from remaining on the fin plate 2. The inner walls of the first plate 21 and the second plate 22 near the diverter block 3 have recessed cavities 6. The recessed cavities 6 on the first plate 21 and the second plate 22 form a sealed cavity structure.

[0031] The cavity 6 contains a heat-absorbing medium, and multiple fixing strips 61 are fixed to the inner wall of the cavity 6. Each fixing strip 61 has a heat-bending strip 62 fixed to the side of the inner wall of the cavity 6. In actual use, the refrigerant passes through the inside of the connecting pipe 1. When the refrigerant passes through the inside of the connecting pipe 1, the exhaust fan drives the outside air to pass between the two fins 2. At this time, the heat in the outside air will be absorbed by the refrigerant inside the connecting pipe 1. Since the fin 2 is connected to the connecting pipe 1, when the outside air comes into contact with the fin 2, the fin 2 can transfer the heat in the outside air to the connecting pipe 1, thereby increasing the area for heat absorption by the refrigerant. When external air passes between the two fins 2, the protrusion 25 can cooperate with the diverter block 3 to divert the external air, thereby allowing the external air to enter the interior of the guide section 4. This design can increase the contact area between the external air and the fins 2, thereby improving the efficiency of the refrigerant in absorbing heat from the external air. When external air passes through the interior of the guide section 4, the two diverter blocks 3 can cooperate with the guide section 4 to form an airflow channel. At the same time, the connecting pipe 1 is connected to the guide section 4 through the through hole 23. This allows the external air to carry away the loose frost layer around the through hole 23 when it passes through the interior of the guide section 4. This can prevent the formation of a thick frost layer around the through hole 23, thereby preventing the frost layer from affecting the contact area between the external air and the fin plate 2, and achieving uniform contact between the fin plate 2 and the heat in the external air. According to the existing usage of compact evaporators, some compact evaporators also periodically heat the fins 2 with the help of an external heating structure. This method is to melt the frost on the evaporator when it is in use, so that the frost becomes droplets. If the fins 2 shown in this document are heated by the external heating structure, the external air passing through the guide section 4 can also carry away the droplets on the fins 2, thereby improving the efficiency of the external heating structure in eliminating the frost. In actual use, the protrusions 31 and grooves 32 on the fin plate 2 can increase the contact area between the fin plate 3 and the outside air. At the same time, the protrusions 31 and grooves 32 can form a honeycomb structure, which can prevent liquid droplets and dust in the outside air from contacting the fin plate 3. This allows the fin plate 2 to maintain a clean effect even after long-term use, reduces the probability of frost forming on the fin plate 2, and allows the heat in the outside air to be conducted into the refrigerant. When heat from the external air or external heating structure is conducted into the fin 2, the heat-absorbing medium inside the cavity 6 can continuously absorb the heat in the fin 2. When the heat in the heat-absorbing medium reaches a suitable range, the hot bending strip 62 can deform. At this time, the hot bending strip 62 can produce a small impact on the inner wall of the cavity 6. Since multiple hot bending strips 62 are distributed inside the cavity 6, when multiple hot bending strips 62 do not simultaneously impact the inner wall of the cavity 6, this impact mode, based on the changes in the heating of multiple hot bending strips 62 at different times, leads to multiple hot bending strips 62 not simultaneously impacting the inner wall of the cavity 6. The diverter block 3 is a raised cavity structure, and the cavity 6 is the cavity in the diverter block 3. When in use, the hot bending strips 62 are directly installed in the raised cavity of the diverter block 3, which can cause a slight vibration on the outer wall of the diverter block 3. When the hot bending strips 62 impact the inner wall of the cavity 6, the surface of the diverter block 3 will undergo a slight deformation, and at the same time, the normal flow direction of the external air will also be changed. The dust and droplets on the surface of the diverter block 3 will also be impacted by the external air, thus causing the dust or droplets on the surface of the diverter block 3 to separate under the action of inertia, thereby giving the fin plate 2 a strong self-cleaning effect. It should be noted that the operation of the hot bending strip 62 requires the diversion of some heat, which will reduce the heat exchange efficiency of the evaporator. This part of the structure can be selected according to the actual use requirements of the evaporator. Since the heating method of the external heating structure on the fin 2 is periodic, the hot bending strip 62 can impact the inner wall of the cavity 6 when the fin 2 is heated. When the fin 2 is not heated, the hot bending strip 62 can return to its original state. By repeating this process, the hot bending strip 62 can treat the dust or droplets on the surface of the diversion block 3. The hot bending strip 62 can be made of nickel-iron based metal material with a thickness of 0.25mm. This material can be stably deformed in the range of minus 15 degrees Celsius to 30 degrees Celsius and has good corrosion resistance. At the same time, the hot bending strip 62 can also be made of suitable materials according to the application environment of the fin plate 2.

[0032] Currently, the finned structure of the compact evaporator used in air source heat pump units on the market is prone to frost formation around the connecting pipe 1 during use. In order to solve this problem, this application provides a flow guide 4 on the surface of the fin plate 2. The external air passing through the flow guide 4 can carry away the liquid droplets or loose frost layer at the contact point between the connecting pipe 1 and the fin plate 2, thereby reducing the frost area at the contact point between the connecting pipe 1 and the fin plate 2. In order to increase the contact area between the external air and the flow guide 4, a flow guide 5 and a baffle 41 are provided inside the flow guide 4. Example 2: Please refer to Figures 1-8 As shown, based on Embodiment 1, the present invention provides a technical solution. Unlike Embodiment 1, the guide section 4 in this embodiment is configured as a trumpet-shaped structure with a large front opening and a small rear opening. This can increase the airflow velocity at the rear when external air passes through the interior of the guide section 4, thereby enabling the rapid separation of droplets or loose frost layers inside the guide section 4.

[0033] A baffle 41 is fixed to the outer wall of the flow guide 4 behind the rear through hole 23, and a flow guide 5 is fixed to the flow guide 4 behind the front through hole 23. Both the flow guide 5 and the baffle 41 can guide the air inside the flow guide 4.

[0034] The flow guide 5 includes a flow guide strip 51 fixed inside the flow guide section 4, a flow divider strip 52 fixed behind the flow guide strip 51 on the flow guide section 4, a guide strip 53 fixed behind the flow divider strip 52 on the flow guide section 4, and an air collecting strip 54 fixed behind the guide strip 53 on the flow guide section 4. The flow guide strip 51, the flow divider strip 52, the guide strip 53, the air collecting strip 54, and the baffle strip 41 are all arc-shaped strip structures.

[0035] The height of the guide bar 51 is lower than the height of the diverter bar 52, the height of the diverter bar 52 is lower than the height of the guide bar 53, the height of the guide bar 53 is lower than the height of the air collecting bar 54, the height of the air collecting bar 54 is lower than the height of the baffle bar 41, the height of the baffle bar 41 is lower than the depth of the guide section 4, and the length of the guide bar 51, diverter bar 52, guide bar 53, air collecting bar 54 and baffle bar 41 is shorter than the width of the guide section 4. When external air enters the interior of the guide section 4, the guide strip 51, the diverting strip 52, the guiding strip 53, the air collecting strip 54 and the baffle 41 can guide the external air inside the guide section 4, thereby enabling the external air to impact the droplets inside the guide section 4 and preventing the droplets from frosting inside the guide section 4. When the external air inside the guide section 4 is guided by the guide strip 51, the diverting strip 52, the guide strip 53, the air collecting strip 54 and the baffle 41, the droplets inside the guide section 4 will be diverted to both sides. Since the edges of the baffle 24 and the diverting block 3 are rounded, the external air can drive the droplets to spread quickly, thereby avoiding the droplets separated from the guide section 4 from being too concentrated, and also preventing the droplets separated from the guide section 4 from flowing back to the fin plate 2. In order to increase the speed at which external air passes through the interior of the guide section 4, this application sets the guide section 4 as a trumpet-shaped structure with a large opening at the front and a small opening at the rear. This can increase the external air velocity at the rear when external air passes through the interior of the guide section 4, thereby enabling the droplets separated at the rear of the guide section 4 to separate quickly when the external air carries the droplets through the interior of the guide section 4. This avoids the droplets separated by the guide section 4 from being distributed around the fin plate 2, and thus prevents the fin plate 2 from being affected by moisture when the droplets evaporate in the external air. The guide strip 51, the diverting strip 52, the guide strip 53, the air collecting strip 54 and the baffle 41 inside the guide section 4 form a multi-stage guide structure. The height of each guide element increases in a stepwise manner, which can compress and accelerate the airflow step by step, so that the air is evenly distributed in the guide section 4 and fully washes the surface of the fin plate 2. In actual use, the baffles 24 set at the upper and lower parts of the fin plate 2 can restrict the leakage of external air and ensure that the external air flows through the preset heat exchange path. This can achieve a uniform distribution of the external air flow field, eliminate the airflow dead zone on the fin plate 2, and make full use of the heat exchange area of ​​the fin plate 2. Thus, the fin plate 2 achieves the maximum heat exchange efficiency of the compact evaporator under the design of this application.

[0036] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. A compact evaporator fin structure for an air source heat pump unit, comprising fins (2) and connecting pipes (1) penetrating the fins (2), wherein support plates (11) are detachably connected to both sides of the connecting pipes (1) on the fins (2), characterized in that, The fins (2) are distributed in multiple ways, and the multiple fins (2) are fixed to the connecting pipe (1) by a through rod (12); The fin plate (2) includes a first plate body (21) and a second plate body (22). The first plate body (21) is seamlessly welded to the second plate body (22). Multiple diversion blocks (3) are fixed vertically on the outer sides of the first plate body (21) and the second plate body (22). Baffles (24) are fixed on the upper and lower parts of the outer sides of the first plate body (21) and the second plate body (22). The flow divider (3) has flow guides (4) distributed on both sides. The windward surfaces of the first plate (21) and the second plate (22) are provided with protrusions (25) near the front of the flow divider (3). The protrusions (25) are used to drive the airflow into the interior of the flow guides (4).

2. The compact evaporator fin structure for an air source heat pump unit according to claim 1, characterized in that, The edges of the baffle (24), the protrusion (25) and the diverter (3) are all rounded. The guide section (4) is a horn-shaped structure with a large opening at the front and a small opening at the rear. The fin plate (2) has through holes (23) at the front and rear of the guide section (4). The connecting pipe (1) passes through the through holes (23) and the fin plate (2).

3. The compact evaporator fin structure for an air source heat pump unit according to claim 1, characterized in that, The diversion block (3) has a hemispherical structure. The surface of the diversion block (3) is provided with protrusions (31) in an array. A groove (32) is provided between two adjacent protrusions (31) on the diversion block (3).

4. The compact evaporator fin structure for an air source heat pump unit according to claim 3, characterized in that, The protrusion (31) is a hemispherical structure, the groove (32) is a concave spherical groove structure, and the diverter block (3), protrusion (31) and groove (32) are coated with a hydrophobic coating.

5. The compact evaporator fin structure for an air source heat pump unit according to claim 4, characterized in that, The surfaces of the first plate (21), the second plate (22), the stop block (24) and the protrusion (25) are also coated with a hydrophobic coating. The inner walls of the first plate (21) and the second plate (22) near the diverter block (3) are provided with a cavity (6). The cavity (6) on the first plate (21) and the cavity (6) on the second plate (22) form a sealed cavity structure.

6. The compact evaporator fin structure for an air source heat pump unit according to claim 5, characterized in that, The cavity (6) contains a heat-absorbing medium, and the inner wall of the cavity (6) is fixed with a plurality of fixing strips (61). Each fixing strip (61) has a heat-bending strip (62) fixed on the side of the inner wall of the cavity (6).

7. The compact evaporator fin structure for an air source heat pump unit according to claim 2, characterized in that, A baffle (41) is fixed to the outer wall of the flow guide (4) behind the rear through hole (23), and a flow guide (5) is fixed to the flow guide (4) behind the front through hole (23). Both the flow guide (5) and the baffle (41) can guide the air inside the flow guide (4).

8. The compact evaporator fin structure for an air source heat pump unit according to claim 7, characterized in that, The flow guide (5) includes a flow guide strip (51) fixed inside the flow guide (4). A flow divider strip (52) is fixed on the flow guide (4) behind the flow guide strip (51). A guide strip (53) is fixed on the flow guide (4) behind the flow divider strip (52). An air collecting strip (54) is fixed on the flow guide (4) behind the guide strip (53). The flow guide strip (51), flow divider strip (52), guide strip (53), air collecting strip (54) and baffle strip (41) are all arc-shaped strip structures.

9. A compact evaporator fin structure for an air source heat pump unit according to claim 8, characterized in that, The height of the guide strip (51) is lower than the height of the diverter strip (52), the height of the diverter strip (52) is lower than the height of the guide strip (53), the height of the guide strip (53) is lower than the height of the gas collecting strip (54), the height of the gas collecting strip (54) is lower than the height of the baffle strip (41), the height of the baffle strip (41) is lower than the depth of the guide section (4), and the length of the guide strip (51), diverter strip (52), guide strip (53), gas collecting strip (54) and baffle strip (41) is shorter than the width of the guide section (4).

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