Heat exchanger and air conditioning unit

Abstract

The utility model provides a kind of heat exchanger and air conditioning unit, heat exchanger includes: outer shell, the upper portion of the outer shell is connected with suction pipe and inlet pipe;Heat exchange coil is set in the outer shell;Plate heat exchange structure is set below the heat exchange coil, and heat exchange with the refrigerant flowing to the bottom of outer shell.The falling-film heat pump heat exchanger of the utility model under refrigeration condition, through the plate heat exchange structure designed below tube bundle, dry liquid refrigerant is evaporated, through the design gas-liquid separation structure and gas flow space, separate gaseous refrigerant and refrigeration oil, realize unit stable liquid recovery.In heating condition, by setting plate heat exchanger structure and back liquid structure, enhance the heat transfer efficiency when liquid refrigerant subcooling heat exchange, and have liquid storage function, reduce the influence of condensate liquid to tube bundle immersion.

Description

Technical Field

[0001] This utility model relates to the field of air conditioning unit technology, specifically a heat exchanger and an air conditioning unit. Background Technology

[0002] Heat pump units have become increasingly widely used because they can simultaneously provide both cooling and heating functions. Conventional heat pump units use either flooded heat exchangers or dry heat exchangers.

[0003] If a flooded heat exchanger is used, the heat exchange tubes are immersed in refrigerant during cooling operation, resulting in a large refrigerant charge. When the unit is operating, the refrigerant boils in a pool state, absorbing heat from the chilled water inside the tubes. At this time, the heat transfer is affected by the static refrigerant column, resulting in low heat exchange efficiency. During heating operation, the gaseous refrigerant on the outside of the tubes condenses and transfers heat to the cooling water inside the tubes to produce hot water.

[0004] If a dry heat exchanger is used, during cooling operation, the gas-liquid two-phase refrigerant evaporates inside the tubes. Since the liquid cannot be evenly distributed to all heat exchange tubes at the inlet, there are significant differences in the heat exchange efficiency of each heat exchanger. The heat exchange tubes with more liquid distribution have the problem of liquid carrying over the gas at the outlet. At the same time, the outside of the dry heat exchanger tubes is a baffled flow of chilled water for heat exchange, which is affected by the flow field and flow velocity, resulting in lower heat exchange efficiency on the outside of the tubes. During heating operation, there are also problems of uneven gas distribution inside the tubes and low flow velocity on the outside of the tubes, resulting in low heat exchange efficiency.

[0005] The working principle of a falling film heat pump heat exchanger is as follows: during cooling, the refrigerant liquid drips onto the outer wall of the heat exchange tube and evaporates, absorbing heat from the chilled water inside the tube. During heating, the refrigerant gas condenses on the outer side of the tube, transferring heat to the cooling water inside the tube. This eliminates the problems of uneven liquid and gas distribution in dry heat exchangers where two-phase refrigerant flows inside the tube, as well as the low heat exchange efficiency due to the low flow velocity of the refrigerant outside the tube. Furthermore, during cooling, the outer side of the tube undergoes thin-film evaporation, with no static liquid column affecting the heat exchange efficiency, resulting in significant advantages over flooded heat exchangers.

[0006] When a falling film heat pump heat exchanger is in cooling mode, and the refrigeration unit is operating under different heat exchange loads, the falling film heat pump heat exchanger also functions as a liquid storage device. Therefore, a certain amount of liquid refrigerant will accumulate at the bottom of the falling film heat pump heat exchanger. Due to the limitations of the heat exchanger type and structure, the liquid refrigerant at the bottom of the heat exchanger cannot be completely evaporated through heat transfer to the outer wall of the high-efficiency heat exchange tubes. Utility Model Content

[0007] In order to solve the technical problem of low heat exchange efficiency in the bottom heat exchange area of ​​the falling film heat pump heat exchanger in the prior art, this utility model proposes a heat exchanger and an air conditioning unit.

[0008] The technical solution adopted in this utility model is:

[0009] This utility model proposes a heat exchanger, comprising:

[0010] The outer casing has an air intake pipe and a liquid inlet pipe connected to its upper part.

[0011] The heat exchange coil is housed within the outer casing;

[0012] The plate heat exchanger structure is located below the heat exchange coil and exchanges heat with the refrigerant flowing to the bottom of the outer casing.

[0013] Furthermore, the outer shell is provided with an air intake cylinder connected to the upper part of the air intake pipe. The heat exchange coil is arranged around the air intake cylinder. A partition plate assembly is provided between the bottom of the air intake cylinder and the plate heat exchange structure. The partition plate assembly separates and forms a liquid flow space connecting the area where the heat exchange coil is arranged and the liquid inlet side of the plate heat exchange structure, and forms a gas flow space connecting the air intake cylinder and the liquid receiving side of the plate heat exchange structure. The liquid receiving side of the plate heat exchange structure is also connected to an outlet channel.

[0014] The partition assembly includes:

[0015] The first bottom plate is connected to the bottom of the air intake cylinder, and its outer edge is connected to the inner wall of the outer shell. The first bottom plate is provided with a first gas flow hole and a strip opening in the middle of the position opposite to the air intake cylinder. The bottom of the air intake cylinder is provided with a notch.

[0016] A T-shaped partition is disposed at the lower part of the air intake cylinder. The edge of its horizontal plate portion is connected to the inner wall of the lower part of the air intake cylinder and is provided with multiple second gas flow holes. Its vertical plate portion is inserted into the strip opening, and the blocked portion of the strip opening forms a strip flow hole. The horizontal plate portion and the first bottom plate are separated into a first space and a second space. The first space connects the strip flow hole and the notch, and the second space connects the first gas flow hole and the second gas flow hole.

[0017] The second bottom plate is located below the first bottom plate, and its outer edge is connected to the inner wall of the outer shell. The second bottom plate is provided with liquid inlet holes corresponding to the liquid inlet side of the plate heat exchange structure and liquid collection holes corresponding to the liquid collection side of the plate heat exchange structure.

[0018] A first vertical partition is disposed between the first bottom plate and the second bottom plate, dividing the space between the first bottom plate and the second bottom plate into a third space and a fourth space. The third space is connected to the strip-shaped flow hole and the liquid inlet hole, and the fourth space is connected to the liquid collection hole and the first gas flow hole.

[0019] Furthermore, the first gas flow hole and the second gas flow hole are offset from each other.

[0020] Furthermore, above the heat exchange coil, there are multiple layers of liquid equalization plates surrounding the suction cylinder, each liquid equalization plate having multiple liquid equalization holes, and the liquid inlet pipe is located above the uppermost liquid equalization plate.

[0021] Plate heat exchanger structures include:

[0022] Multiple heat exchange plates are arranged vertically at intervals inside the outer shell. Each heat exchange plate is provided with a liquid inlet hole corresponding to the liquid inlet side of the plate heat exchange structure and a liquid collection hole corresponding to the liquid collection side of the plate heat exchange structure. A heat exchange flow channel is formed between two adjacent heat exchange plates.

[0023] The liquid distribution pipe and liquid collection pipe pass through the liquid inlet and liquid collection throughlet of each heat exchange plate, respectively. The liquid distribution pipe is provided with liquid outlet holes at intervals along the vertical direction, and the liquid collection pipe is provided with liquid return holes at intervals along the vertical direction. The outer shell is provided with water inlet and water outlet corresponding to the heat exchange channel. Multiple heat exchange channels alternately connect the liquid outlet and return holes as well as the water inlet and outlet, forming refrigerant channels and coolant channels that alternate along the vertical direction. The second vertical partition is located inside the refrigerant channel.

[0024] Furthermore, a gas-liquid separation structure is provided in the middle of the plate heat exchange structure. The liquid inlet side of the gas-liquid separation structure is connected to the liquid receiving side of the plate heat exchange structure. An oil outlet hole is also provided at the bottom of the outer shell corresponding to the position of the gas-liquid separation structure.

[0025] The gas-liquid separation structure includes an outer cylinder and an inner cylinder disposed within the outer cylinder. The annular gas-liquid separation space between the inner wall of the outer cylinder and the outer wall of the inner cylinder is provided with an annular gas-liquid filter screen and a liquid collection plate from top to bottom. The liquid collection plate is in the shape of an upwardly flared funnel and has liquid collection flow holes on its inner edge.

[0026] The outer cylinder and inner cylinder are vertically arranged in the middle of the plate heat exchange structure. The top is connected to the bottom surface of the partition plate assembly, and the bottom is connected to the bottom surface of the outer shell. The bottom of the outer cylinder is provided with stepped flow holes; the bottom of the inner cylinder is provided with liquid flow holes. The refrigerant after heat exchange through the plate heat exchange structure enters the annular gas-liquid separation space from the stepped flow holes of the outer cylinder for gas-liquid separation. The top of the annular gas-liquid separation space is connected to the gas flow space of the partition plate assembly.

[0027] Furthermore, a liquid outlet channel is provided in the middle of the gas-liquid separation structure to form a liquid return structure. The liquid return structure includes: a pipe that is vertically installed in the inner cylinder and has a gap left in the inner wall of the inner cylinder. The top of the pipe is spaced apart from the bottom surface of the partition plate assembly, and the bottom is connected to a liquid outlet pipe installed on the bottom surface of the outer shell.

[0028] Furthermore, an airway baffle assembly is provided inside the air intake cylinder to divide the airway inside the air intake cylinder into a U-shape.

[0029] Furthermore, the airway baffle assembly specifically includes:

[0030] A cross partition plate is disposed inside the air intake cylinder, dividing the air intake cylinder into four longitudinal air channels, and the cross partition plate is spaced apart from the bottom of the air intake cylinder.

[0031] An open baffle plate is provided on top of the cross baffle plate to close the tops of two opposite air passages among the four air passages.

[0032] Multiple gas side flow holes are provided at different heights on the side of the air intake cylinder, and the gas side flow holes are positioned directly opposite two air passages that are closed at the top.

[0033] Furthermore, the heat exchange coil includes multiple spiral heat exchange tube bundles arranged from top to bottom, each spiral heat exchange tube bundle including: an outer coil and an inner coil located inside the outer coil.

[0034] Furthermore, the side of the outer casing is also provided with a water chamber structure connecting the inlet pipe and the outlet pipe. The refrigerant flowing from the inlet pipe into the water chamber structure passes through the plate heat exchange structure and the heat exchange coil in sequence before flowing out from the outlet pipe.

[0035] This utility model also proposes an air conditioning unit, characterized in that it includes the above-mentioned heat pump heat exchanger.

[0036] Compared with the prior art, the present invention has the following advantages:

[0037] In cooling mode, the falling film heat pump heat exchanger utilizes a plate heat exchange structure below the tube bundle to evaporate the liquid refrigerant. A gas-liquid separation structure and gas flow space separate the gaseous refrigerant from the refrigeration oil, enabling stable liquid intake and oil return for the unit. In heating mode, the plate heat exchanger structure and liquid return structure enhance the heat transfer efficiency during subcooling of the liquid refrigerant and provide liquid storage, reducing the impact of condensate on the tube bundle immersion. Attached Figure Description

[0038] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0039] Figure 1 This is a schematic diagram of the regional structure of the heat exchanger in an embodiment of this utility model;

[0040] Figure 2 This is a schematic diagram of the structure of the heat exchanger's hidden outer shell in an embodiment of this utility model;

[0041] Figure 3 This is a longitudinal half-sectional view of the heat exchanger in an embodiment of this utility model;

[0042] Figure 4 This is a schematic diagram of the heat exchange coil structure in an embodiment of this utility model;

[0043] Figure 5 This is a schematic diagram of the installation structure of the heat exchange coil in an embodiment of this utility model;

[0044] Figure 6 This is an exploded view of the suction cylinder in an embodiment of this utility model;

[0045] Figure 7 This is a schematic diagram of the refrigerant flow under refrigeration conditions in an embodiment of this utility model.

[0046] Figure 8 This is a schematic diagram of the structure of the third liquid equalization plate in an embodiment of this utility model;

[0047] Figure 9 This is a schematic diagram of the hidden part of the structure in this utility model embodiment, showing the space for gas and liquid flow.

[0048] Figure 10 This is a schematic diagram of the structure of the base plate in an embodiment of this utility model;

[0049] Figure 11 This is a schematic diagram of the liquid distribution tube in an embodiment of this utility model;

[0050] Figure 12 This is a schematic diagram of the liquid receiving tube in an embodiment of this utility model;

[0051] Figure 13 This is a schematic diagram of the heat exchange plate structure in an embodiment of this utility model;

[0052] Figure 14 This is a schematic diagram of the water chamber structure in an embodiment of this utility model;

[0053] Figure 15 This is a schematic diagram of the outer cylinder structure in an embodiment of this utility model;

[0054] Figure 16 This is a schematic diagram of the inner cylinder structure in an embodiment of this utility model;

[0055] Figure 17 This is a schematic diagram of the liquid collection plate in an embodiment of this utility model;

[0056] Figure 18 This is a schematic diagram of the T-shaped partition in an embodiment of the present invention;

[0057] Figure 19 This is a schematic diagram of refrigerant flow under heating conditions in an embodiment of this utility model;

[0058] 1. Tube bundle heat exchange area; 2. U-shaped air passage; 4. Liquid inlet pipe; 5. Suction pipe; 6. First layer liquid distribution plate; 7. Second layer liquid distribution plate; 8. Outer shell; 9. Spiral heat exchange tube bundle; 10. Third layer liquid distribution plate; 11. Suction cylinder; 12. Perforated baffle; 13. Cross partition plate; 14. T-shaped baffle; 15. Outer coil; 16. Inner coil; 17. Tube bundle support plate; 18. Inlet and outlet water connectors; 19. Upper gas side flow hole; 20. Lower gas side flow hole; 21. Liquid flow space; 22. Gas flow space; 23. Plate heat exchange structure; 24. First layer bottom plate; 25. Liquid flow hole; 26. First gas flow hole; 27. Second layer bottom plate; 28. 29. First vertical partition; 30. Heat exchange plate; 31. Liquid distribution pipe; 32. Liquid collection pipe; 33. Outer cylinder; 34. Liquid outlet; 35. Stepped flow passage; 36. Liquid return hole; 37. Second vertical partition; 38. Water inlet pipe; 39. Water inlet and outlet chambers; 40. Water outlet pipe; 41. Water chamber partition; 42. Water inlet; 43. Left water chamber; 44. Water outlet; 45. Gas-liquid separation structure; 46. Inner cylinder; 47. Gas-liquid filter screen; 48. Liquid collection plate; 49. Connecting pipe; 51. Serrated flow passage; 52. Liquid collection flow passage; 53. Semi-annular flow passage; 54. Second gas flow passage; 55. Oil outlet pipe; 56. Liquid outlet pipe; 57. Cover plate; 58. Welded bracket; Detailed Implementation

[0059] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0060] The principle and structure of this utility model will be described in detail below with reference to the accompanying drawings and embodiments.

[0061] In cooling mode, the gas-liquid mixed refrigerant in a falling film heat pump heat exchanger is evenly distributed horizontally by a distributor at the top of the outer shell, and then drips from top to bottom onto the outer wall of the heat exchange tubes. As the liquid refrigerant continuously evaporates on the outer wall of the heat exchange tubes, the resulting gas disturbs the liquid column, causing it to drift. This means that a small portion of the liquid refrigerant fails to drip vertically along the tube bundle, deviating from the heat exchange area and accumulating at the bottom of the heat exchanger. Simultaneously, the falling film heat pump heat exchanger also functions as a liquid storage unit under different heat exchange loads, resulting in a certain amount of liquid refrigerant accumulating at the bottom. Due to limitations in the heat exchanger's type and structure, the liquid refrigerant at the bottom cannot be completely evaporated through heat transfer to the outer wall of the high-efficiency heat exchange tubes.

[0062] Falling film heat pump heat exchangers function as condensers during heating operations and also serve as liquid storage devices. This is especially important when the air conditioning unit uses an air-cooled finned heat exchanger as the evaporator, where the falling film heat pump heat exchanger stores a large amount of liquid refrigerant. In this case, the lower section of the tube bundle is immersed in the liquid refrigerant. This portion of the tube bundle's heat exchange area can be used to cool the liquid refrigerant to a subcooled state, thus improving the unit's energy efficiency. However, high-efficiency heat pump heat exchanger tubes typically have a toothed outer surface designed for refrigerant phase change heat transfer. The root of the outer fins features T-shaped teeth to enhance liquid evaporation, and the tooth tips are machined with sharp structures to promote condensation and drainage. This results in lower heat transfer efficiency when used for subcooled heat transfer with single-phase liquid refrigerant. Furthermore, the slow flow of the tube bundle immersed in liquid refrigerant further reduces the heat transfer efficiency during subcooled heat transfer.

[0063] Based on the above requirements, this utility model proposes a high-efficiency falling film heat pump heat exchanger. In cooling mode, it can further evaporate the liquid refrigerant at the bottom of the heat exchanger and separate the gaseous refrigerant, achieving stable liquid extraction and oil return at the bottom of the heat exchanger. In heating mode, it can enhance the heat transfer efficiency during subcooling of the liquid refrigerant at the bottom of the heat exchanger, reduce the impact of condensate on the tube bundle immersion, and thus fully utilize the heat exchange area of ​​the heat exchange tubes, improving the unit's energy efficiency.

[0064] like Figure 1 , 2 As shown in Figure 3, the heat pump heat exchanger specifically includes: an outer shell 8, a heat exchange coil, and a plate heat exchange structure 23. The outer shell 8 has an air intake at the middle of its top, and the air intake is connected to an air intake pipe 5 located outside the outer shell 8. The outer shell 8 has a liquid inlet near its upper edge, and the liquid inlet is connected to a liquid inlet pipe 4 located outside the outer shell 8. The heat exchange coil is located inside the outer shell 8 and performs falling film heat exchange with the refrigerant to form a tube bundle heat exchange area 1. The plate heat exchange structure 23 is located below the heat exchange coil. After the refrigerant performs falling film heat exchange with the heat exchange coil, it flows to the bottom of the outer shell 8 for further heat exchange.

[0065] Therefore, in refrigeration mode, the liquid refrigerant can be evaporated, improving the overall heat exchange efficiency of the heat exchanger. Moreover, in heating mode, by setting up plate heat exchange junctions, the heat transfer efficiency during subcooling of the liquid refrigerant can be enhanced, and it also has a liquid storage function, reducing the impact of condensate on the tube bundle, i.e., the heat exchange coil.

[0066] In a specific embodiment, the outer shell 8 is cylindrical, with an air intake 11 located at its axial center (it should be noted that it may not be located at the axial center; its location at the axial center is mainly for the convenience of arranging heat exchange coils around it). The heat exchange coils are arranged around the air intake 11, and the top of the air intake 11 is connected to the inner wall of the top surface of the outer shell 8, so that the upper part of the air intake 11 is directly connected to the air intake pipe 5. A partition plate assembly is provided between the bottom of the air intake 11 and the plate heat exchange structure 23. The four edges of the partition plate assembly are connected to the inner wall of the side of the outer shell 8. The partition plate assembly, together with the air intake 11, divides the outer shell 8 into three regions. The two regions located at the upper part of the partition plate assembly are the air passage region inside the air intake 11 and the annular heat exchange region between the air intake 11 and the inner wall of the outer shell 8 where the heat exchange coils are arranged, i.e., the tube bundle heat exchange region 1, and the plate heat exchange region located at the lower part of the partition plate assembly where the plate heat exchange structure 23 is arranged. Simultaneously, the partition plate assembly, through separation, also forms a liquid flow space 21 connecting the heat exchange coil installation area (i.e., tube bundle heat exchange area 1) and the liquid inlet side of the plate heat exchange structure 23 (which is located in the plate heat exchange area), and a gas flow space 22 connecting the suction cylinder 11 (i.e., the gas passage area within the suction cylinder 11) and the liquid receiving side of the plate heat exchange structure 23 (which is located in the plate heat exchange area). Furthermore, the liquid receiving side of the plate heat exchange structure 23 is also connected to a liquid outlet channel, from which liquid refrigerant flows out during heating operation.

[0067] Thus, under refrigeration conditions, the refrigerant, after undergoing falling film heat exchange through the heat exchange coil, passes through the liquid flow space 21 to the plate heat exchange structure 23 for further evaporation, and then returns from the gas flow space 22 to the gas passage area in the suction cylinder 11, and flows out from the suction pipe 5 at the top of the suction cylinder 11 through the gas passage area.

[0068] In heating mode, after the gaseous refrigerant enters the suction cylinder 11, it flows out from the gas side flow hole on the side of the suction cylinder 11 and reaches the tube bundle heat exchange area of ​​the heat exchange coil for the first step of heat exchange into liquid state. Then, it passes through the liquid flow space 21 to reach the plate heat exchange structure 23 for further heat exchange. Then, it flows out from the liquid outlet in the plate heat exchange structure 23, which has a certain height (close to the top of the plate heat exchange structure 23, located below the partition plate assembly). Because the liquid outlet inlet of the liquid outlet has a certain height, the bottom of the shell has a liquid storage function when heating.

[0069] In specific embodiments, such as Figure 9 , 10 As shown in Figure 18, the partition assembly includes: a first bottom plate 24, a T-shaped partition 14, a second bottom plate 27, and a first vertical partition 28, wherein:

[0070] The first bottom plate 24 is specifically in the shape of a circular plate, with the bottom end face of the air intake cylinder 11 connected in the middle and the outer edge connected to the inner wall of the outer shell 8. At the same time, the first bottom plate 24 is provided with a first gas flow hole 26 and a strip opening in the middle of the position opposite to the air intake cylinder 11. In addition, the bottom of the air intake cylinder 11 is provided with a notch.

[0071] T-shaped partition 14 is disposed at the lower part of the suction cylinder 11 near the bottom end face. Its horizontal plate part is closed and connected to the inner wall of the suction cylinder 11 near the bottom end, and is provided with multiple second gas flow holes 54 for gas to pass through. Its vertical plate part is inserted downward into the strip opening of the first bottom plate 24. The blocked part of the strip opening forms a strip flow hole (i.e., liquid flow hole 25), and the strip flow hole and the second gas flow hole 54 are separated by the vertical plate part. At the same time, the vertical plate part divides the horizontal plate part and the first bottom plate 24 into a first space on the left and a second space on the right. The first space connects the strip flow hole and the notch at the bottom of the suction cylinder 11, and the second space connects the first gas flow hole 26 and the second gas flow hole 54.

[0072] The second bottom plate 27 is specifically circular and located below the first bottom plate 24, and is parallel to the first bottom plate 24 at intervals. Its outer edge is connected to the inner wall of the outer shell 8. The second bottom plate 27 has liquid inlet holes corresponding to the liquid inlet side of the plate heat exchange structure 23 and liquid collection holes corresponding to the liquid collection side of the plate heat exchange structure 23 near the opposite side edges. In addition, the surface is also provided with semi-annular flow holes 53 for corresponding to the gas-liquid separation structure.

[0073] The first vertical partition 28 is disposed between the first bottom plate 24 and the second bottom plate 27, dividing the space between the first bottom plate 24 and the second bottom plate 27 into a third space on the left and a fourth space on the right. The third space is connected to the strip-shaped flow hole and the liquid inlet hole (specifically, the liquid inlet side of the plate heat exchange structure 23), and the fourth space is connected to the liquid collection hole (specifically, the liquid collection side of the plate heat exchange structure 23) and the first gas flow hole 26.

[0074] The first and third spaces are connected by a liquid flow hole 25, forming a liquid flow space 21 that connects the heat exchange coil area with the liquid inlet side of the plate heat exchange structure 23. The second and fourth spaces are connected by a first gas flow hole 26, forming a gas flow space 22 that connects the suction cylinder 11 with the liquid receiving side of the plate heat exchange structure 23. By separating the gas flow space 22 and the liquid flow space 21, it is ensured that the heat exchanger can operate normally in both heating and cooling modes, while also allowing for further heat exchange through the bottom plate heat exchange structure.

[0075] In a further embodiment, such as Figure 9As shown, the first gas flow hole 26 and the second gas flow hole 54 are vertically staggered. Specifically, the first gas flow hole 26 is set in a semi-circle along the edge of the first bottom plate 24, and the second gas flow hole 54 is located in the middle of the horizontal plate part of the T-shaped partition, and is vertically staggered with the first gas flow hole 26 to form a bent gas flow channel.

[0076] In addition, such as Figure 10 As shown, a semi-annular flow hole 53 is machined on the second bottom plate 27. The semi-annular flow hole 53 is located in the region of the gas flow space 22, and its size is equal to half of the area of ​​the annular shape formed by the outer cylinder 33 and the inner cylinder 46. The semi-annular flow hole 53 communicates with the gas flow space 22 and is used to guide the gaseous refrigerant separated by the gas-liquid separation structure 45 in the middle of the plate heat exchange structure 23 upward.

[0077] In specific embodiments, such as Figure 2 As shown, above the heat exchange coil, there are also multiple liquid equalization plates surrounding the suction cylinder 11. The liquid equalization plates are circular, with the outer edge connected to the inner wall of the outer shell 8 and the inner edge connected to the outer wall of the suction cylinder 11. Each liquid equalization plate has multiple liquid equalization holes, and the liquid inlet pipe 4 is located above the uppermost liquid equalization plate.

[0078] The liquid refrigerant entering the annular heat exchange space from the liquid inlet pipe 4 is first homogenized by multiple liquid distribution plates, so that the liquid refrigerant drips evenly onto the heat exchange coil below the liquid distribution plates, which improves the heat exchange efficiency and is more conducive to the falling film evaporation of the heat exchange coil.

[0079] Specifically, below the liquid inlet pipe 4 are the first liquid distribution plate 6 and the second liquid distribution plate 7. Liquid distribution holes are machined on the first liquid distribution plate 6 and the second liquid distribution plate 7, and the liquid distribution holes on the two liquid distribution plates are staggered in the vertical direction.

[0080] In specific embodiments, such as Figure 2 , 3 As shown in Figure 13, the plate heat exchange structure 23 includes: multiple circular heat exchange plates 29, a second vertical partition 37, a liquid distribution pipe 31, and a liquid collection pipe 32, wherein:

[0081] Multiple heat exchange plates 29 are spaced vertically and disposed in the area below the partition plate assembly inside the outer shell 8. Each heat exchange plate 29 is provided with a liquid inlet hole corresponding to the liquid inlet side of the plate heat exchange structure 23 and a liquid collection hole corresponding to the liquid collection side of the plate heat exchange structure 23. The positions of the two holes of all heat exchange plates 29 are directly opposite to the positions of the liquid inlet hole and the liquid collection hole on the second bottom plate 27 and are the same size. The two adjacent heat exchange plates 29 form a heat exchange channel that is not interconnected.

[0082] like Figure 9 , 11As shown in Figure 12, the bottom of the liquid distribution pipe 31 is closed and the top is open; the top and bottom of the liquid collection pipe 32 are both open, and the bottom is provided with a stepped flow hole 35 (so that the refrigerant in the liquid collection pipe 32 can flow through the stepped flow hole at the bottom to the gas-liquid separation structure 45 in the middle and the liquid outlet channel). The liquid distribution pipe 31 and the liquid collection pipe 32 pass through the second bottom plate 27 and the liquid inlet and liquid outlet holes of each heat exchange plate 29, respectively. The liquid distribution pipe 31 is provided with liquid outlet holes 34 at intervals along the vertical direction, and the liquid collection pipe 32 is provided with liquid outlet holes 34 at intervals along the vertical direction. The outer casing 8 is provided with a liquid return hole 36 at intervals. The liquid outlet hole 34 and the liquid return hole 36 are arranged in an odd number of heat exchange channels from top to bottom. The outer casing 8 is also provided with multiple pairs of water inlets 42 and water outlets 44 at intervals from top to bottom on both sides of the second vertical partition 37. Each pair of water inlets 42 and water outlets 44 are arranged in an even number of heat exchange channels from top to bottom. This allows the multiple heat exchange channels to alternately connect the liquid outlet and return hole 36 and the water inlets and outlets 44, forming a refrigerant channel and a coolant channel that alternate vertically.

[0083] The plate heat exchange structure 23 effectively increases the heat exchange area between the liquid refrigerant and the coolant by stacking multiple layers of circular heat exchange plates 29, and at the same time increases the flow rate of the liquid refrigerant, which can improve the heat transfer efficiency when the refrigerant is subcooled.

[0084] In addition, such as Figure 9 , 13 As shown, a second vertical baffle 37 is also provided in the refrigerant flow channel. The two ends of the second vertical baffle 37 are respectively connected to the gas-liquid separation structure 45 and the inner wall of the outer shell 8. The second vertical baffle 37 is used to separate the water inlet and water outlet of the refrigerant flow channel. The water inlet and water outlet 44 are provided on the outer shell 8 and are located on both sides of the second vertical baffle 37 respectively.

[0085] Preferably, the heat exchange plates 29 can be made of corrugated plates stacked together to further increase the turbulence of the liquid refrigerant and the coolant, enhance heat exchange, and increase the heat exchange area.

[0086] In specific operating conditions, the refrigerant enters the refrigerant channel from each liquid outlet 34 of the liquid distribution pipe 31, and then flows towards the liquid collection pipe 32. The refrigerant that enters the refrigerant channel from the water inlet 42 flows out from the water outlet 44 after circling the refrigerant channel. Moreover, since the upper and lower layers of the refrigerant channel are both refrigerant channels, they can fully exchange heat with the refrigerant in the refrigerant channel, resulting in high heat exchange efficiency and no interference between them.

[0087] In specific embodiments, such as Figure 1As shown, the plate heat exchanger structure 23 is also provided with a gas-liquid separation structure 45 in the middle. That is, the circular heat exchange plate 29 has a circular opening in the middle for installing the gas-liquid separation structure 45. The gas-liquid separation structure 45 has a liquid outlet channel in the middle. The liquid inlet side of the gas-liquid separation structure 45 is connected to the liquid receiving side of the plate heat exchanger structure 23. The bottom of the outer shell is also provided with an oil outlet hole corresponding to the position of the gas-liquid separation structure for connecting the oil outlet pipe 55. By adding the gas-liquid separation structure 45, the heat exchanger can simultaneously have the effect of gas-liquid separation, and can further separate the refrigeration oil in the refrigerant.

[0088] Specifically, such as Figure 1 As shown in Figures 15 to 18, the gas-liquid separation structure 45 includes: an outer cylinder 33 and an inner cylinder 46 coaxially disposed within the outer cylinder 33; the outer cylinder 33 and the inner cylinder 46 are vertically disposed in the middle of the plate heat exchange structure 23 (the plate heat exchange structure 23 surrounds the gas-liquid separation structure 45), that is, in the circular opening position in the middle of the circular heat exchange plate 29. The top of the outer cylinder 33 and the inner cylinder 46 are connected to the bottom surface of the partition plate assembly, and the bottom is connected to the bottom surface of the outer shell 8. The bottom of the outer cylinder 33 is provided with a stepped flow hole 35; the bottom of the inner cylinder 46 is provided with a serrated flow hole 51 (forming a liquid flow hole). The refrigerant after heat exchange through the plate heat exchange structure 23 enters the annular gas-liquid separation space from the stepped flow hole 35 of the outer cylinder 33 for gas-liquid separation, and the top of the annular gas-liquid separation space is connected to the gas flow space 22 of the partition plate assembly (specifically, through a semi-annular flow hole provided on the second bottom plate).

[0089] The annular gas-liquid separation space between the inner wall of the outer cylinder 33 and the outer wall of the inner cylinder 46 is provided with an annular gas-liquid filter screen 47 and a liquid collection plate 48 from top to bottom. The liquid collection plate 48 is in the shape of an upwardly flared trumpet, and the inner edge is provided with a liquid collection flow hole 52. An oil outlet is provided on the bottom surface of the outer shell 8, which is directly opposite the annular gas-liquid separation space.

[0090] Under refrigeration conditions, after the liquid refrigerant accumulated at the bottom of the heat exchanger is dried by the plate heat exchanger structure 23, the liquid refrigeration oil flows out from the stepped flow hole 35 at the bottom of the liquid collection pipe 32 and enters the bottom of the gas-liquid separation structure 45, and finally flows out from the oil outlet pipe and returns to the compressor. The gaseous refrigerant flows out from the opening at the top of the liquid collection pipe 32 and enters the gas flow space 22.

[0091] A small portion of the gaseous refrigerant carried by the liquid refrigeration oil flows upwards in the gas-liquid separation structure 45 under the influence of gravity. Specifically, it flows upwards along the annular channel formed by the outer cylinder 33 and the inner cylinder 46, passing sequentially through the annular liquid collecting plate 48 and the gas-liquid filter screen 47. The rising gaseous refrigerant carries a small amount of refrigeration oil droplets, which are adsorbed and collected into larger droplets by the gas-liquid filter screen 47 and drip downwards. These droplets further accumulate and grow on the annular liquid collecting plate 48. The larger droplets overcome gravity and continue dripping downwards from the liquid collection orifice 52 to the bottom of the gas-liquid separation structure 45, then flow out through the oil outlet pipe and return to the compressor. The gaseous refrigerant separated by the gas-liquid filter screen 47 enters the gas flow space 22 through the semi-annular orifice 53 and mixes with the gaseous refrigerant flowing out from the top opening of the liquid collection pipe 32. The gaseous refrigerant in the gas flow space 22 is affected by the suction of the compressor in the suction cylinder 11 and by gravity. It flows upward through the first bottom plate 24 and the gas flow hole of the T-shaped partition 14, and finally enters the suction cylinder 11 and flows out from the suction pipe 5.

[0092] Specifically, such as Figure 7 As shown, a liquid outlet channel is provided in the middle of the gas-liquid separation structure 45 to form a liquid return structure. The liquid return structure includes: a pipe 49 vertically arranged in the inner cylinder 46. The pipe 49 is coaxially arranged with the inner cylinder 46 and its outer diameter is smaller than that of the inner cylinder 46, so that there is a gap between it and the inner wall of the inner cylinder 46. The top of the pipe 49 is spaced apart from the bottom surface of the partition plate assembly, and the bottom is connected to the liquid outlet pipe 56 arranged on the bottom surface of the outer shell 8.

[0093] In heating mode, liquid refrigerant accumulates at the bottom of the outer casing 8, partially submerging the oil separation structure and plate heat exchange structure 23. When the liquid refrigerant level is higher than the opening at the top of the connecting pipe 49, it enters the connecting pipe 49 and flows out along the liquid outlet channel formed by the connecting pipe 49 and the liquid outlet pipe 56. This allows liquid refrigerant to be stored at the bottom during heating mode.

[0094] In a specific embodiment, an air duct baffle assembly is provided inside the suction cylinder 11 to divide the air duct inside the suction cylinder 11 into a U-shape. By designing the U-shaped air duct, the gaseous refrigerant travel is increased, and the gas-liquid separation is achieved by utilizing the collision effect of fluid turning with the wall and the effect of gravity to avoid liquid being carried in the compressor suction.

[0095] Specifically, such as Figure 6 , 7 As shown, the airway baffle assembly includes: a cross baffle 13 and an open baffle 12.

[0096] A cross partition plate 13 is installed inside the air intake cylinder 11. The end face of the cross partition plate 13 is cross-shaped, and its four side plates are connected to the inner wall of the air intake cylinder 11, dividing the air intake cylinder 11 into four longitudinal air channels. The cross partition plate 13 is spaced from the bottom of the air intake cylinder 11, so that the bottoms of the four air channels are connected.

[0097] The perforated baffle 12 is set on top of the cross baffle 13, which closes the top of two opposite air passages among the four air passages, so that the gas flows in a U-shape from the other two opposite air passages to the two air passages with their tops closed.

[0098] In addition, multiple gas side flow holes are provided at different heights on the side of the air intake 11, and the gas side flow holes are set directly opposite the two top-closed air passages.

[0099] After the gaseous refrigerant enters from the suction pipe 5 at the top of the suction cylinder 11, it first flows downward along the two unsealed gas channels at the top until the bottom of the suction cylinder 11, and then flows upward along the two sealed gas channels at the top (due to the misaligned design of the gas flow measurement holes in the gas flow space 22, most of the gaseous refrigerant is blocked by the partition plate assembly when it flows downward and will not enter the gas flow space 22). Then it flows out through the gas side flow hole to the area where the heat exchange coil is installed, and exchanges heat with the heat exchange coil. By designing the U-shaped gas channel 2 to increase the gaseous refrigerant's travel, and by utilizing the collision effect of the fluid turning and the wall and the effect of gravity, gas-liquid separation is achieved to avoid the compressor sucking in liquid.

[0100] like Figure 4 , 5 As shown, the heat exchange coil includes multiple spiral heat exchange tube bundles 9 arranged from top to bottom. Each spiral heat exchange tube bundle 9 includes an outer coil 15 and an inner coil 16 located within the outer coil 15. The outer coil 15 is a single-layer spiral, and the inner coil 16 is a double-layer spiral, meaning the spiral heat exchange tube bundle 9 has a three-layer spiral structure. During assembly, it corresponds one-to-one with the three layers of liquid equalization holes arranged in a ring on the second-layer liquid equalization plate 7 in the vertical direction. A tube bundle support plate 17 is inserted between each layer of heat exchange tubes in the vertical direction of the spiral heat exchange tube bundle 9 to fix the spiral heat exchange tube bundle 9. Figure 2 , Figure 5 As shown, both ends of the heat exchange tubes of the spiral heat exchange tube bundle 9 are welded with water inlet and outlet connectors 18, and the water inlet and outlet connectors 18 are welded and fixed to the outer shell 8.

[0101] The use of multi-layer spiral heat exchanger tube bundles arranged vertically ensures a more uniform distribution of the refrigerant and facilitates the downward flow of gaseous refrigerant along the heat exchanger tubes. Furthermore, each layer of the spiral heat exchanger employs a three-layer spiral structure, further increasing the density of the heat exchanger tubes and thus improving the heat exchange efficiency.

[0102] Specifically, such as Figure 8 As shown, a third liquid distribution plate 10 is disposed below the first spiral heat exchanger tube bundle 9. Incompletely evaporated liquid refrigerant collects on the upper layer of the third liquid distribution plate 10. After re-distribution, the liquid continues to flow downwards, dripping onto the outer surface of the lower spiral heat exchanger tube bundle 9 for evaporative heat exchange. Figure 8As shown, the outer ring of the third-layer liquid equalization plate 10 has an upward convex structure to increase the liquid level height above the third-layer liquid equalization plate 10, reduce the turbulence effect of the evaporating airflow on the liquid, and achieve stable gravity-based liquid equalization. Upper gas side flow holes 19 are machined on the inner wall of the suction cylinder 11 in the upper region of the third-layer liquid equalization plate 10, and lower gas side flow holes 20 are machined on the suction cylinder 11 in the lower region of the third-layer liquid equalization plate 10. The upper gas side flow holes 19 and the lower gas side flow holes 20 are discontinuously distributed in the circumferential direction.

[0103] The side of the outer casing is also provided with a water chamber that connects the inlet pipe and the outlet pipe. The refrigerant flowing into the water chamber from the inlet pipe passes through the plate heat exchange structure and the heat exchange coil in sequence before flowing out from the outlet pipe.

[0104] Specifically, such as Figure 2 , Figure 14 As shown, the inlet pipe 38 is located in the lower region of the inlet / outlet water chamber 39, and the outlet pipe 40 is located in the upper region of the inlet / outlet water chamber 39. A horizontal water chamber partition 41 is placed in the middle of the inlet / outlet water chamber 39, and the height of the water chamber partition 41 is located in the region below the spiral heat exchange tube bundle and above the second bottom plate 27. In the water chamber space formed by welding the inlet / outlet water chamber 39 to the outer shell 8, the area below the water chamber partition 41 and the refrigerant flow channel area are located, and the outer shell 8 has a machined inlet 42. In the water chamber space formed by welding the left water chamber 43 to the outer shell 8, the refrigerant flow channel area is located, and the outer shell 8 has a machined outlet 44. The refrigerant enters the inlet / outlet water chamber 39 through the inlet pipe 38 and then enters the refrigerant channel through the inlet 42, where it exchanges heat with the liquid in the refrigerant channel. It then flows out through the outlet 44 into the left water chamber 43, and subsequently enters the spiral heat exchanger tube bundle through the inlet / outlet connectors 18 at both ends, where it exchanges heat with the refrigerant on the outside of the tube. Finally, the refrigerant flows out through the other inlet / outlet connector 18 into the inlet / outlet water chamber 39 and out through the outlet pipe 40. The centralized inlet and outlet water chambers facilitate pipe laying and subsequent pipe connections.

[0105] like Figure 19As shown, under heating conditions, the high-temperature, high-pressure gaseous refrigerant discharged from the compressor enters the interior of the suction cylinder 11 through the suction pipe 5. After passing through the U-shaped gas passage 2, it enters the tube bundle region for heat exchange through the upper gas side flow hole 19 and the lower gas side flow hole 20. The high-temperature, high-pressure gaseous refrigerant releases heat and condenses into a liquid state on the outer surface of the spiral heat exchange tube bundle. The liquid refrigerant gathers above the first bottom plate 24, passes through the liquid flow hole 25 on the first bottom plate 24, reaches the top of the second bottom plate 27, and enters the interior of the liquid distribution pipe 31 through the top opening of the liquid distribution pipe 31. Liquid refrigerant exchanges heat with the heat transfer fluid in the plate heat exchanger structure 23. The subcooled liquid refrigerant flows out from the top opening of the liquid collection pipe 32 and the bottom stepped flow-through hole 35. The refrigerant flowing out from the top opening enters above the second bottom plate 27 and flows downwards through the semi-annular flow-through hole 53 machined on the second bottom plate 27, passing sequentially through the gas-liquid filter screen 47 and the annular collection plate 48, mixing with the subcooled liquid refrigerant flowing out from the stepped flow-through hole 35. Under the suction and discharge action of the compressor, the liquid refrigerant enters the interior of the inner cylinder 46 through the liquid flow-through hole 51 machined at the bottom of the inner cylinder 46. The connecting pipe 49 extends into the upper region of the inner cylinder 46. Therefore, after the liquid refrigerant fills the annular space between the inner cylinder 46 and the connecting pipe 49 from bottom to top, the liquid refrigerant flows out of the heat exchanger through the liquid outlet pipe 56. Figure 9 As shown, the gas flow holes on the T-shaped partition 14, the first bottom plate 24, and the second bottom plate 27 are staggered in the vertical direction to form a bent gas flow channel, which can reduce the blowing interference caused by the gaseous refrigerant flowing in the U-shaped gas channel 2 on the liquid refrigerant above the second bottom plate 27 and the liquid refrigerant outlet at the bottom of the heat exchanger.

[0106] In heating mode, the annular space between the inner cylinder 46 and the connecting pipe 49 at the bottom of the heat exchanger is a separately set liquid storage space. The liquid refrigerant filling the liquid storage space can reduce the area of ​​the lower tube bundle immersed in the liquid refrigerant, thereby reducing the condensing temperature of the air conditioning unit and improving the unit's energy efficiency.

[0107] like Figure 2 As shown, the bottom of the plate heat exchanger structure 23 is a cover plate 57, which is welded to the outer shell 8. A support 58 is welded below the cover plate 57.

[0108] This utility model also proposes an air conditioning unit, including the aforementioned heat exchanger, which can specifically be a heat pump unit. Using this falling film heat pump heat exchanger in cooling mode, a plate heat exchange structure is designed below the tube bundle to evaporate the liquid refrigerant. A gas-liquid separation structure and gas flow space are designed to separate the gaseous refrigerant and refrigeration oil, achieving stable liquid intake and oil return for the unit. In heating mode, the plate heat exchanger structure and liquid return structure enhance the heat transfer efficiency during subcooling of the liquid refrigerant and provide a liquid storage function, reducing the impact of condensate on the tube bundle immersion.

[0109] It should be noted that the terminology used above is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this utility model. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0110] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0111] In the description of this utility model, it should be understood that the directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner and outer contours of each component itself.

[0112] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0113] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, these terms have no special meaning and therefore should not be construed as limiting the scope of protection of this utility model. The above description is only a preferred embodiment of this utility model and is not intended to limit this utility model. For those skilled in the art, this utility model can have various modifications and variations. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A heat exchanger, characterized in that, include: The outer casing has an air intake pipe and a liquid inlet pipe connected to its upper part. The heat exchange coil is housed within the outer casing; The plate heat exchanger structure is located below the heat exchange coil and exchanges heat with the refrigerant flowing to the bottom of the outer casing.

2. The heat exchanger as described in claim 1, characterized in that, The outer shell is provided with an air intake cylinder connected to the air intake pipe at the top. The heat exchange coil is arranged around the air intake cylinder. A partition plate assembly is provided between the bottom of the air intake cylinder and the plate heat exchange structure. The partition plate assembly separates and forms a liquid flow space connecting the area where the heat exchange coil is arranged and the liquid inlet side of the plate heat exchange structure, and forms a gas flow space connecting the air intake cylinder and the liquid receiving side of the plate heat exchange structure. The liquid receiving side of the plate heat exchange structure is also connected to an outlet channel.

3. The heat exchanger as described in claim 2, characterized in that, The partition assembly includes: The first bottom plate is connected to the bottom of the air intake cylinder, and its outer edge is connected to the inner wall of the outer shell. The first bottom plate is provided with a first gas flow hole and a strip opening in the middle of the position opposite to the air intake cylinder. The bottom of the air intake cylinder is provided with a notch. A T-shaped partition is disposed at the lower part of the air intake cylinder. The edge of its horizontal plate portion is connected to the inner wall of the lower part of the air intake cylinder and is provided with multiple second gas flow holes. Its vertical plate portion is inserted into the strip opening, and the blocked portion of the strip opening forms a strip flow hole. The horizontal plate portion and the first bottom plate are separated into a first space and a second space. The first space connects the strip flow hole and the notch, and the second space connects the first gas flow hole and the second gas flow hole. The second bottom plate is located below the first bottom plate, and its outer edge is connected to the inner wall of the outer shell. The second bottom plate is provided with liquid inlet holes corresponding to the liquid inlet side of the plate heat exchange structure and liquid collection holes corresponding to the liquid collection side of the plate heat exchange structure. A first vertical partition is disposed between the first bottom plate and the second bottom plate, dividing the space between the first bottom plate and the second bottom plate into a third space and a fourth space. The third space is connected to the strip-shaped flow hole and the liquid inlet hole, and the fourth space is connected to the liquid collection hole and the first gas flow hole.

4. The heat exchanger as described in claim 3, characterized in that, The first gas flow hole and the second gas flow hole are offset from each other.

5. The heat exchanger as described in claim 2, characterized in that, Above the heat exchange coil, there are also multiple liquid equalization plates surrounding the air suction cylinder, and the liquid equalization plates are provided with multiple liquid equalization holes.

6. The heat exchanger as described in claim 2, characterized in that, The plate heat exchanger structure includes: Multiple heat exchange plates are arranged vertically at intervals inside the outer shell. Each heat exchange plate is provided with a liquid inlet hole corresponding to the liquid inlet side of the plate heat exchange structure and a liquid collection hole corresponding to the liquid collection side of the plate heat exchange structure. A heat exchange flow channel is formed between two adjacent heat exchange plates. The liquid distribution pipe and liquid collection pipe pass through the liquid inlet and liquid collection throughlet of each heat exchange plate, respectively. The liquid distribution pipe is provided with liquid outlet holes at intervals along the vertical direction, and the liquid collection pipe is provided with liquid return holes at intervals along the vertical direction. The outer shell is provided with water inlet and water outlet corresponding to the heat exchange channel. Multiple heat exchange channels alternately connect the liquid outlet and return holes as well as the water inlet and water outlet, forming refrigerant channels and coolant channels that alternate along the vertical direction. The second vertical partition is located inside the refrigerant channel.

7. The heat exchanger as described in claim 2, characterized in that, The plate heat exchanger structure is also provided with a gas-liquid separation structure in the middle. The liquid inlet side of the gas-liquid separation structure is connected to the liquid receiving side of the plate heat exchanger structure. The bottom of the outer shell is also provided with an oil outlet corresponding to the position of the gas-liquid separation structure.

8. The heat exchanger as described in claim 7, characterized in that, The gas-liquid separation structure includes an outer cylinder and an inner cylinder disposed within the outer cylinder. The annular gas-liquid separation space between the inner wall of the outer cylinder and the outer wall of the inner cylinder is provided with an annular gas-liquid filter screen and a liquid collection plate from top to bottom. The liquid collection plate is in the shape of an upwardly flared trumpet and has liquid collection flow holes on its inner edge. The outer cylinder and inner cylinder are vertically arranged in the middle of the plate heat exchange structure. The top is connected to the bottom surface of the partition plate assembly, and the bottom is connected to the bottom surface of the outer shell. The bottom of the outer cylinder is provided with stepped flow holes; the bottom of the inner cylinder is provided with liquid flow holes. The refrigerant after heat exchange through the plate heat exchange structure enters the annular gas-liquid separation space from the stepped flow holes of the outer cylinder for gas-liquid separation. The top of the annular gas-liquid separation space is connected to the gas flow space of the partition plate assembly.

9. The heat exchanger as described in claim 8, characterized in that, The gas-liquid separation structure has a liquid outlet channel in the middle to form a liquid return structure. The liquid return structure includes: a pipe that is vertically installed in the inner cylinder and has a gap in the inner wall of the inner cylinder. The top of the pipe is spaced apart from the bottom surface of the partition plate assembly, and the bottom is connected to a liquid outlet pipe installed on the bottom surface of the outer shell.

10. The heat exchanger as claimed in claim 2, characterized in that, The air intake cylinder is equipped with an airway baffle assembly, which divides the airway inside the air intake cylinder into a U-shape.

11. The heat exchanger as claimed in claim 10, characterized in that, The airway baffle assembly specifically includes: A cross partition plate is disposed inside the air intake cylinder, dividing the air intake cylinder into four longitudinal air channels, and the cross partition plate is spaced apart from the bottom of the air intake cylinder. An open baffle plate is provided on top of the cross baffle plate to close the tops of two opposite air passages among the four air passages. Multiple gas side flow holes are provided at different heights on the side of the air intake cylinder, and the gas side flow holes are positioned directly opposite two air passages that are closed at the top.

12. The heat exchanger as claimed in claim 1, characterized in that, The heat exchange coil includes multiple spiral heat exchange tube bundles arranged from top to bottom, and each spiral heat exchange tube bundle includes an outer coil and an inner coil located inside the outer coil.

13. The heat exchanger as claimed in claim 1, characterized in that, The outer casing is also provided with a water chamber structure connecting the inlet pipe and the outlet pipe. The refrigerant flowing from the inlet pipe into the water chamber structure passes through the plate heat exchange structure and the heat exchange coil in sequence before flowing out from the outlet pipe.

14. An air conditioning unit, characterized in that, Includes the heat exchanger as described in any one of claims 1 to 13.

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