Falling film type heat pump heat exchanger and air conditioning unit

Abstract

The falling film type heat pump heat exchanger comprises an outer shell and an inner barrel which are coaxially nested, and a gas-liquid separation structure, a liquid uniformizing structure and a heat exchange tube bundle are sequentially arranged between the outer shell and the inner barrel in the axial direction; a two-way gas path structure, a flow channel separation structure and a liquid discharging structure are sequentially arranged in the inner cylinder body in the coaxial direction; the corresponding inner barrel is divided into a first channel communicated with the two-way gas path structure and a second channel communicated with the liquid discharge structure by the flow channel separation structure; a third channel communicated with the second channel is formed between the two-way gas circuit structure and the corresponding inner cylinder body; the inner cylinder is provided with a first through hole corresponding to the third channel, the first channel is provided with a second through hole corresponding to the heat exchange tube bundle, and the inner cylinder is provided with a third through hole corresponding to the liquid discharge structure. In this way, dry spots are not prone to being generated on the outer wall face of the heat exchange tube bundle in the refrigerating working condition, the heat exchange area of the heat exchange tube bundle can be fully utilized in the heating working condition, and the heat exchange efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of refrigeration technology, and in particular to a falling film heat pump 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. Existing heat pump units generally use falling film heat pump heat exchangers.

[0003] The working principle of a falling film heat pump heat exchanger is as follows: During cooling, liquid refrigerant drips onto the outer wall of the heat exchange tube and evaporates to absorb heat from the chilled water inside the tube. During heating, gaseous refrigerant 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 and low heat exchange efficiency caused by the low flow velocity of the refrigerant outside the tube in dry heat exchangers. Furthermore, during cooling, the outer side of the tube evaporates as a thin film, without a static liquid column affecting heat exchange efficiency, resulting in significant advantages over flooded heat exchangers.

[0004] 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 shell, and then drips from top to bottom onto the outer wall of the heat exchange tubes. Because the distributor contains a pressurized gas-liquid mixture of refrigerant, the flow velocity is high when the gas and liquid impact the outer wall of the heat exchange tubes in the upper section of the tube bundle, easily causing liquid splashing. Simultaneously, during the dripping process of the liquid refrigerant along the tube bundle from top to bottom, it is easily disturbed by the gas blower from the distributor, causing the liquid column to drift, thus forming dry spots on the outer wall of the heat exchange tubes and reducing the heat transfer efficiency of the heat exchanger. As the liquid refrigerant drips from top to bottom and continuously evaporates on the outer wall of the tube bundle, there is less liquid refrigerant in the lower section of the tube bundle, making it prone to dry spots.

[0005] Falling film heat pump heat exchangers function as condensers during heating operations and also serve as liquid storage devices. This is especially true when the air conditioning unit uses an air-cooled finned heat exchanger for 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, reducing the heat exchange area for condensing the gaseous refrigerant entering the falling film heat pump heat exchanger from the compressor exhaust. This results in an increase in the air conditioning unit's condensing temperature and a decrease in unit energy efficiency.

[0006] Therefore, the existing falling film heat pump heat exchanger has the following shortcomings: dry spots are easily generated on the outer wall of the heat exchange tube in the cooling mode, which reduces the heat transfer efficiency of the heat exchanger; in the heating mode, the heat exchange tube bundle is immersed in liquid refrigerant, the heat exchange area of ​​the heat exchange tube is not fully utilized, and the unit has low energy efficiency. Utility Model Content

[0007] This utility model provides a falling film heat pump heat exchanger and an air conditioning unit to solve the problems in the prior art where, when the falling film heat pump heat exchanger is in cooling mode, dry spots easily form on the outer wall of the heat exchange tube, reducing the heat transfer efficiency of the heat exchanger; and when it is in heating mode, the heat exchange area of ​​the heat exchange tube is not fully utilized.

[0008] The technical solution of this utility model is a falling film heat pump heat exchanger, comprising:

[0009] The outer shell and inner cylinder are coaxially nested, and a gas-liquid separation structure, a liquid equalization structure and a heat exchange tube bundle are arranged sequentially along the axial direction between the outer shell and the inner cylinder;

[0010] The inner cylinder is provided with a bidirectional gas passage structure, a flow channel separation structure and a liquid drainage structure in sequence along the same axis.

[0011] The flow channel separation structure divides the corresponding inner cylinder into a first channel that communicates with the bidirectional gas path structure and a second channel that communicates with the liquid drainage structure.

[0012] The bidirectional air passage structure and the corresponding inner cylinder form a third channel that communicates with the second channel;

[0013] The inner cylinder is provided with a first through hole corresponding to the third channel, the first channel is provided with a second through hole corresponding to the heat exchange tube bundle, and the inner cylinder is provided with a third through hole corresponding to the drain structure.

[0014] The gas-liquid separation structure is used to connect to the condenser, and the bidirectional gas path structure is used to connect to the compressor.

[0015] Furthermore, the flow channel separation structure includes:

[0016] A partition plate that divides the inner cylinder between the bidirectional gas passage structure and the liquid drainage structure into a first channel and a second channel along the axial direction.

[0017] A first baffle is located at one end of the partition plate facing the gas-liquid separation structure, and the first baffle extends radially and completely covers the radial section of the corresponding inner cylinder; a fourth through hole is provided in the middle region of the first baffle for connecting the bidirectional gas path structure and the first channel; a fifth through hole is provided at the edge of the first baffle for connecting the second channel and the third channel.

[0018] Furthermore, the flow channel separation structure also includes:

[0019] The second baffle is located at the other end of the partition plate facing the drainage structure, and the second baffle extends radially and completely covers the radial section of the corresponding inner cylinder; the second baffle is provided with a sixth through hole for connecting the second channel and the drainage structure.

[0020] Furthermore, the inner cylinder is provided with a seventh through hole corresponding to the liquid equalization structure, which communicates with the second channel. The seventh through hole is located below the first through hole and is used to transport the gaseous refrigerant on the liquid equalization structure to the second channel.

[0021] Furthermore, the homogenizing structure includes:

[0022] A liquid distribution plate extends radially and completely covers the radial section of the annular gap between the inner cylinder and the outer cylinder; the liquid distribution plate is provided with at least one row of liquid distribution through holes in the circumferential direction, the liquid distribution through holes being used to uniformly drip liquid refrigerant onto the outer wall of the heat exchange tube bundle below.

[0023] A diversion plate is located at the edge of the liquid equalization plate and is arranged circumferentially toward the gas-liquid separation structure. The diversion plate is in close contact with the inner sidewall of the corresponding outer shell. The diversion plate is used to gather the liquid refrigerant on the inner sidewall of the outer shell onto the liquid equalization plate.

[0024] Furthermore, the drainage structure includes:

[0025] The inner cylinder below the flow channel separation structure forms a liquid collection space, which is connected to the second channel, and the side wall of the liquid collection space away from the flow channel separation structure is provided with a third through hole.

[0026] A drain pipe has one end axially positioned within the liquid collection space, and the height of the drain pipe within the liquid collection space is lower than the axial height of the liquid collection space; the other end of the drain pipe penetrates the bottom wall of the inner cylinder and extends to the outside, for connecting to an independent liquid storage device.

[0027] Furthermore, the gas-liquid separation structure includes a spiral baffle plate arranged spirally along the axial direction, the spiral baffle plate extending radially and completely covering the radial cross section of the corresponding annular gap between the inner cylinder and the outer cylinder;

[0028] The outer casing located above the spiral baffle is connected to a first pipe, which is used to connect to the condenser through a throttling device.

[0029] Furthermore, the inner cylinder is provided with a first through hole in a spiral shape arranged along the axial direction, corresponding to the spiral baffle plate.

[0030] Furthermore, the bidirectional gas path structure includes:

[0031] An air collection space is formed by the inner cylinder located above the flow channel separation structure, and the air collection space is connected to the first channel;

[0032] The second pipe has one end connected to the gas collection space and the other end connected to the compressor.

[0033] An air baffle is disposed at the top of the air collection space and extends radially to completely cover the radial cross-section of the third channel; the air baffle is used to ensure that gaseous refrigerant flows from the third channel into the second channel.

[0034] Furthermore, the heat exchange tube bundle consists of an outer coil and an inner coil, with the outer coil wrapping around the corresponding inner coil.

[0035] Furthermore, both the outer coil and the inner coil have at least one spiral structure along the radial direction.

[0036] Furthermore, the inner sidewall of the outer shell is provided with a tube bundle support plate along the axial direction corresponding to the heat exchange tube bundle, and the tube bundle support plate is provided with a limiting groove along the axial direction and corresponding to the spiral structure, the limiting groove being used to fix the heat exchange tube bundle.

[0037] Furthermore, the outer wall of the outer casing is also sealed with an inlet water chamber and an outlet water chamber;

[0038] The water inlet chamber is equipped with a water inlet pipe, which is used to connect to the water outlet on the user side;

[0039] The water outlet chamber is equipped with a water outlet pipe; the water outlet pipe is used to connect to the water inlet on the user side;

[0040] Both ends of the heat exchange tube bundle are provided with bidirectional flow joints that penetrate the outer shell, and a sealing structure is provided between the penetration point of the outer shell and the corresponding bidirectional flow joint;

[0041] The bidirectional flow joints at the first end of the heat exchange tube bundle are all connected to the inlet water chamber, while the bidirectional flow joints at the second end of the heat exchange tube bundle are all connected to the outlet water chamber.

[0042] This utility model also proposes an air conditioning unit, which includes the falling film heat pump heat exchanger described above.

[0043] Compared with the prior art, the present invention has at least the following beneficial effects:

[0044] When the falling film heat pump heat exchanger of this utility model is in refrigeration mode, the liquid refrigerant is uniformly and slowly dripped downwards onto the outer wall of the heat exchange tube bundle through the liquid equalization structure, and the lower part of the heat exchange tube bundle is partially immersed in the liquid refrigerant. Then, the gaseous refrigerant passes through the first through hole, the third channel, the second channel, and the liquid drainage structure in sequence, and is discharged from the third through hole. At this time, the gaseous refrigerant will form bubbles in the liquid refrigerant in the lower part of the heat exchange tube bundle. The growth, rising and breaking of the bubbles will cause disturbance to the liquid refrigerant. This disturbance will destroy the boundary layer of the liquid refrigerant and reduce thermal resistance, thereby improving the heat exchange efficiency. At the same time, the bubbles break when they come into contact with the outer wall of the heat exchange tube bundle, which easily forms vaporization nuclei on the surface, increases the number of evaporation bubble generation points and promotes bubble growth, thereby improving the evaporation heat transfer efficiency or heat exchange efficiency on the refrigerant side.

[0045] When the falling film heat pump heat exchanger is in heating mode, the gaseous refrigerant passes through the first channel and the second through hole in sequence and is discharged to the outer wall of the heat exchange tube bundle for condensation and heat exchange. The high-temperature and high-pressure gaseous refrigerant releases heat and condenses into liquid refrigerant on the outer wall of the heat exchange tube bundle. Then, the liquid refrigerant enters the drainage structure through the third through hole and is discharged to an independently set liquid storage device. This ensures that the area of ​​the lower part of the heat exchange tube bundle immersed in the liquid refrigerant is reduced, thereby increasing the heat exchange area for condensation between the heat exchange tube bundle and the high-temperature and high-pressure gaseous refrigerant and improving the heat exchange efficiency of the falling film heat pump heat exchanger. Attached Figure Description

[0046] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains; the terminology used herein in the specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention; the terms "comprising" and "having," and any variations thereof, in the specification, claims, and accompanying drawings of this invention are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the specification, claims, or accompanying drawings of this invention are used to distinguish different objects and not to describe a particular order.

[0047] 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.

[0048] Figure 1 This is a schematic diagram of the internal structure of the falling film heat pump heat exchanger proposed in this utility model.

[0049] Figure 2This is a schematic diagram of the internal structure of the outer shell proposed in this utility model;

[0050] Figure 3 This is a schematic diagram of the inner cylinder structure proposed in this utility model;

[0051] Figure 4 This is an exploded view of the flow channel separation structure proposed in this utility model;

[0052] Figure 5 This is an exploded view of the heat exchange tube bundle and tube bundle support plate proposed in this utility model.

[0053] Figure 6 This is a schematic diagram of the refrigerant flow in the cooling mode of the falling film heat pump heat exchanger proposed in this utility model.

[0054] Figure 7 This is a schematic diagram of the refrigerant flow within the outer shell of the falling film heat pump heat exchanger proposed in this utility model when it is in refrigeration mode.

[0055] Figure 8 This is a schematic diagram of the refrigerant flow in the heating mode of the falling film heat pump heat exchanger proposed in this utility model.

[0056] Figure label:

[0057] 1. Outer shell;

[0058] 2. Inner cylinder; 21. First channel; 22. Second channel; 23. Third channel; 24. First through hole; 25. Second through hole; 26. Third through hole; 27. Seventh through hole;

[0059] 3. Gas-liquid separation structure; 31. Spiral baffle; 32. First pipe;

[0060] 4. Liquid distribution structure; 41. Liquid distribution plate; 411. Liquid distribution through hole; 42. Drainage plate;

[0061] 5. Heat exchanger tube bundle; 51. Outer coil; 52. Inner coil; 53. Two-way flow joint;

[0062] 6. Two-way air passage structure; 61. Air collection space; 62. Second pipe; 63. Baffle plate;

[0063] 7. Flow channel separation structure; 71. Partition plate; 72. First baffle; 721. Fourth through hole; 722. Fifth through hole; 73. Second baffle; 731. Sixth through hole;

[0064] 8. Drainage structure; 81. Liquid collection space; 82. Drainage pipe;

[0065] 9. Tube bundle support plate; 91. Limiting groove;

[0066] 10. Water inlet chamber; 101. Water inlet pipe;

[0067] 11. Water outlet chamber; 111. Water outlet pipe;

[0068] 12. Support bracket. Detailed Implementation

[0069] To make the technical problem to be solved, the technical solution, and the 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. Therefore, a feature pointed out in this specification is used to describe one feature of one embodiment of the present utility model, and does not imply that every embodiment of the present utility model must have the described feature. Furthermore, it should be noted that this specification describes many features. Although certain features may be combined to illustrate possible system designs, these features may also be used in other combinations not explicitly stated. Therefore, unless otherwise stated, the described combinations are not intended to be limiting.

[0070] The principle and structure of this utility model will be described in detail below with reference to the accompanying drawings and embodiments.

[0071] In some embodiments, such as Figure 1 and Figure 2 As shown, this utility model proposes a falling film heat pump heat exchanger, comprising:

[0072] The outer shell 1 and inner cylinder 2 are coaxially nested, and a gas-liquid separation structure 3, a liquid equalization structure 4 and a heat exchange tube bundle 5 are arranged sequentially along the axial direction between the outer shell 1 and the inner cylinder 2.

[0073] The inner cylinder 2 is provided with a bidirectional air passage structure 6, a flow channel separation structure 7 and a liquid drainage structure 8 arranged sequentially along the same axis.

[0074] The flow channel separation structure 7 divides the corresponding inner cylinder 2 into a first channel 21 that communicates with the bidirectional gas path structure 6 and a second channel 22 that communicates with the liquid drainage structure 8.

[0075] The bidirectional air passage structure 6 and the corresponding inner cylinder 2 form a third channel 23 that communicates with the second channel 22;

[0076] The inner cylinder 2 corresponding to the gas-liquid separation structure 3 is provided with a first through hole 24 communicating with the third channel 23, the first channel 21 is provided with a second through hole 25 corresponding to the heat exchange tube bundle 5, and the inner cylinder 2 is provided with a third through hole 26 corresponding to the liquid drainage structure 8.

[0077] The gas-liquid separation structure 3 is used to connect to the condenser through a throttling device, the bidirectional gas path structure 6 is used to connect to the compressor, and the liquid discharge structure 8 is used to discharge the liquid refrigerant to an independent liquid storage device (not shown, same throughout).

[0078] It should be noted that the outer shell 1 and the inner cylinder 2 are preferably cylindrical in shape.

[0079] Furthermore, the end with the bidirectional gas path structure 6 is the top of the falling film heat pump heat exchanger, and the end with the drain structure 8 is the bottom of the falling film heat pump heat exchanger. Therefore, the outer shell 1 and the inner cylinder 2 are provided with a gas-liquid separation structure 3, a liquid equalization structure 4 and a heat exchange tube bundle 5 in sequence from the top to the bottom. The inner cylinder 2 is provided with a bidirectional gas path structure 6, a flow channel separation structure 7 and a drain structure 8 in sequence from the top to the bottom.

[0080] The condenser is connected to the gas-liquid separation structure 3 through a throttling device, and the throttling device reduces the pressure of the high-pressure liquid refrigerant output by the condenser to a low-pressure gas-liquid two-phase refrigerant.

[0081] Among them, when the falling film heat pump heat exchanger is in refrigeration mode (such as...) Figure 6 As shown), the gas-liquid separation structure 3 separates the input gas-liquid two-phase refrigerant into liquid refrigerant and gaseous refrigerant. The separated liquid refrigerant flows along the inner wall of the corresponding outer shell 1 and / or the gas-liquid separation structure 3 to the liquid equalization structure 4. Under the effect of sedimentation in the large space, a refrigerant level will form on the liquid equalization structure 4. Then, the liquid equalization structure 4 achieves unpressurized gravity liquid equalization, that is, the liquid refrigerant will drip evenly and slowly downwards from the liquid equalization structure 4 onto the outer wall of the heat exchange tube bundle 5 under the action of gravity. Heat exchange and evaporation form gaseous refrigerant; simultaneously, the separated gaseous refrigerant passes sequentially through the first through hole 24, the third channel 23, the second channel 22, and the drain structure 8, and is discharged from the third through hole 26 to the area below the heat exchange tube bundle 5. Then, the separated gaseous refrigerant mixes with the gaseous refrigerant formed by heat exchange, and the mixed gaseous refrigerant passes sequentially through the second through hole 25 and the first channel 21 and enters the bidirectional gas path structure 6. Then, the bidirectional gas path structure 6 delivers the gaseous refrigerant to the compressor.

[0082] Of course, the liquid distribution structure 4 achieves unpressurized gravity-based liquid distribution, meaning that the flow velocity of the liquid refrigerant dripping uniformly downwards from the liquid distribution structure 4 onto the outer wall of the heat exchange tube bundle 5 is low, reducing splashing of the liquid refrigerant. Furthermore, the gap between the liquid distribution structure 4 and the heat exchange tube bundle 5 is small, and the second through-hole 25 located within the area of ​​the heat exchange tube bundle 5 is below the liquid distribution structure 4. Therefore, during the dripping of the liquid refrigerant along the heat exchange tube bundle 5 from top to bottom, the liquid column drift phenomenon caused by gaseous refrigerant blowing is reduced, thereby enhancing the uniformity of liquid refrigerant distribution, reducing dry spots formed on the outer wall of the heat exchange tube bundle 5, and ensuring the heat transfer efficiency of the falling film heat pump heat exchanger. Also, due to cooling demand, if too much liquid refrigerant is dripped uniformly downwards from the liquid distribution structure 4, it will accumulate between the outer shell 1 and the inner cylinder 2. A refrigerant level is formed below the annular gap, ensuring that the lower region of the heat exchange tube bundle 5 is partially immersed in the liquid refrigerant. It is also necessary to ensure that the third through-hole 26 is immersed in the liquid refrigerant. This prevents dry spots from forming on the outer wall of the lower region of the heat exchange tube bundle 5. When the gaseous refrigerant enters the drainage structure 8, it can only be discharged through the third through-hole 26. At this point, the gaseous refrigerant will form bubbles in the liquid refrigerant not immersed in the heat exchange tube bundle 5. The growth, rise, and collapse of these bubbles will cause disturbances in the liquid refrigerant. These disturbances will disrupt the boundary layer of the liquid refrigerant, reducing thermal resistance and thus improving heat exchange efficiency. Simultaneously, when the bubbles contact the outer wall of the heat exchange tube bundle 5, they break, easily forming vaporization nuclei on the surface, increasing the number of evaporation bubble generation points and promoting bubble growth, thereby improving the evaporative heat transfer efficiency or heat exchange efficiency on the refrigerant side.

[0083] When the falling film heat pump heat exchanger is in heating mode (such as...) Figure 8 As shown in the diagram, the compressor discharges high-temperature, high-pressure gaseous refrigerant into the bidirectional gas path structure 6. This gaseous refrigerant passes through the first channel 21 and the second through-hole 25 before being discharged to the outer wall of the heat exchange tube bundle 5 for condensation and heat exchange. The high-temperature, high-pressure gaseous refrigerant releases heat and condenses into liquid refrigerant on the outer wall of the heat exchange tube bundle 5. The liquid refrigerant settles and accumulates in the lower area of ​​the heat exchange tube bundle 5. At this time, the liquid refrigerant enters the drain structure 8 through the third through-hole 26. When the liquid refrigerant in the drain structure 8 reaches a preset height, it is discharged to the outside and into a liquid storage device that is independently set up with the falling film heat pump heat exchanger. Then, the liquid refrigerant in the liquid storage device passes through a throttling valve to reach the evaporator. This ensures that the area of ​​the lower region of the heat exchange tube bundle 5 immersed in the liquid refrigerant is reduced, increasing the heat exchange area for condensation of the high-temperature, high-pressure gaseous refrigerant between the heat exchange tube bundle 5 and the heat exchanger, thereby improving the heat exchange efficiency of the falling film heat pump heat exchanger.

[0084] The refrigerant flow during refrigeration is as follows: condenser → throttling device → gas-liquid separation structure 3. The gas-liquid separation structure 3 then separates the two-phase refrigerant into liquid and gaseous refrigerant. The flow of the separated liquid refrigerant is as follows: gas-liquid separation structure 3 → liquid equalization structure 4 → heat exchange tube bundle 5 → second through hole 25 → first channel 21 → bidirectional gas path structure 6 → compressor. The flow of the separated gaseous refrigerant is as follows: gas-liquid separation structure 3 → first through hole 24 → third channel 23 → second channel 22 → liquid drain structure 8 → third through hole 26 → heat exchange tube bundle 5 → second through hole 25 → first channel 21 → bidirectional gas path structure 6 → compressor.

[0085] The refrigerant flow during heating is as follows: compressor → bidirectional gas path structure 6 → first channel 21 → second through hole 25 → heat exchange tube bundle 5 → third through hole 26 → liquid drain structure 8 → liquid storage device.

[0086] Therefore, when the falling film heat pump heat exchanger proposed in this utility model is in cooling mode, it can prevent dry spots from forming on the outer wall surface of the heat exchange tube bundle 5, thereby improving the heat transfer efficiency or heat exchange efficiency of the falling film heat pump heat exchanger; when in heating mode, it can make full use of the heat exchange area of ​​the heat exchange tube bundle 5, thereby improving the heat exchange efficiency of the falling film heat pump heat exchanger.

[0087] In some embodiments, such as Figure 2 As shown, the gas-liquid separation structure 3 includes a spiral baffle 31 arranged spirally along the axial direction. The spiral baffle 31 extends radially and completely covers the radial section of the annular gap between the inner cylinder 2 and the outer shell 1.

[0088] The outer casing 1 located above the spiral baffle 31 is connected to a first pipe 32, which is used to connect to the condenser through a throttling device.

[0089] It should be noted that the spiral baffle 31 has a circular through hole in the middle axial direction, the inner edge of the spiral baffle 31 is sealed to the outer wall of the corresponding inner cylinder 2, and the outer edge of the spiral baffle 31 is sealed to the inner wall of the corresponding outer shell 1.

[0090] Therefore, after the gas-liquid two-phase refrigerant enters the spiral baffle 31, the liquid refrigerant will be thrown towards the inner wall of the outer shell 1 by the spiral centrifugal action of the spiral baffle 31 and then flow along the spiral baffle 31 to the liquid equalization structure 4, while the gaseous refrigerant will be thrown towards the inner cylinder 2. Then the thrown gaseous refrigerant flows into the third channel 23 from the first through hole 24. The third channel 23 then flows into the second channel 22 and the liquid drainage structure 8 in sequence, and then is discharged from the third through hole 26 to the area below the heat exchange tube bundle 5.

[0091] In some embodiments, to ensure that the gaseous refrigerant separated by the spiral baffle 31 by the first through hole 24 flows into the third channel 23 through the first through hole 24, such as... Figure 1 As shown, the inner cylinder 2 is provided with a first through hole 24 in a spiral shape arranged along the axial direction, corresponding to the spiral baffle 31.

[0092] In some embodiments, such as Figure 2 As shown, the homogenizing structure 4 includes:

[0093] Liquid distribution plate 41 extends radially and completely covers the radial section of the annular gap between the inner cylinder 2 and the outer shell 1; the liquid distribution plate 41 is provided with at least one row of liquid distribution through holes 411 in the circumferential direction, the liquid distribution through holes 411 being used to uniformly drip liquid refrigerant onto the outer wall of the heat exchange tube bundle 5 below.

[0094] A diversion plate 42 is located at the edge of the liquid equalization plate 41 and is arranged circumferentially toward the gas-liquid separation structure 3. The diversion plate 42 is in close contact with the inner sidewall of the corresponding outer shell 1. The diversion plate 42 is used to gather the liquid refrigerant on the inner sidewall of the outer shell 1 onto the liquid equalization plate 41.

[0095] It should be noted that the liquid distribution plate 41 is annular, and the inner edge of the liquid distribution plate 41 is sealed to the outer wall of the corresponding inner cylinder 2, while the outer edge of the liquid distribution plate 41 is sealed to the inner wall of the corresponding outer shell 1. Furthermore, the liquid distribution plate 41 in this embodiment is illustrated by having at least three rows of liquid distribution through holes 411 along the circumferential direction.

[0096] Therefore, when the falling film heat pump heat exchanger is in cooling mode, the gas-liquid separation structure 3 separates the input gas-liquid two-phase refrigerant into liquid refrigerant and gaseous refrigerant. The separated liquid refrigerant flows spirally downward along the spiral baffle 31 and converges onto the liquid leveling plate 41. A portion of the liquid refrigerant on the inner wall of the corresponding outer shell 1 continuously converges onto the liquid leveling plate 41 along the guide plate 42. Then, under the settling effect in the large space, a refrigerant level is formed above the liquid leveling plate 41. Under the influence of gravity, the liquid refrigerant drips evenly downwards from the liquid distribution orifice 411 onto the outer wall of the heat exchange tube bundle 5. The dripping speed is slow to reduce splashing of the liquid refrigerant. Furthermore, during the dripping process of the liquid refrigerant along the heat exchange tube bundle 5 from top to bottom, the liquid column drift phenomenon caused by the blowing of gaseous refrigerant can be reduced, thereby enhancing the uniformity of liquid refrigerant distribution, reducing dry spots formed on the outer wall of the heat exchange tube bundle 5, and ensuring the heat exchange efficiency of the falling film heat pump heat exchanger.

[0097] Furthermore, the second through hole 25 is located below the first channel 21. If the second through hole 25 were located above the first channel 21, it would be easy for the dripping liquid refrigerant droplets to enter the first channel 21 from the second through hole 25, which would easily cause the compressor to draw in liquid.

[0098] In other embodiments, to ensure that the diversion plate 42 can stably deliver liquid refrigerant to the liquid distribution plate 41, the top of the diversion plate 42 away from the liquid distribution plate 41 is provided with a chamfer, and the inclination direction of the chamfer is from the outer shell 1 toward the inner cylinder 2 and downward.

[0099] In some embodiments, such as Figure 2 and Figure 3 As shown, the inner cylinder 2 is provided with a seventh through hole 27 corresponding to the liquid equalization structure 4, which communicates with the second channel 22. The seventh through hole 27 is located below the first through hole 24 and is used to transport the gaseous refrigerant on the liquid equalization structure 4 to the second channel 22.

[0100] It should be noted that there are multiple seventh through holes 27 along the circumference of the corresponding inner cylinder 2, and adjacent seventh through holes 27 are not connected.

[0101] Because when a refrigerant level forms above the equalizing plate 41, there will inevitably be gaseous refrigerant between the refrigerant level and the bottom of the spiral baffle 31. To prevent the gaseous refrigerant above the refrigerant level from affecting the uniform and slow dripping process of the equalizing plate 41, the gaseous refrigerant above the refrigerant level will flow into the second channel 22 through the seventh through hole 27 to merge with the gaseous refrigerant separated from the spiral baffle 31.

[0102] In some embodiments, such as Figure 2 and Figure 4 As shown, the flow channel separation structure 7 includes:

[0103] The partition plate 71 divides the inner cylinder 2 between the bidirectional gas passage structure 6 and the liquid drainage structure 8 into a first channel 21 and a second channel 22 along the axial direction, and the outer edge of the partition plate 71 is sealed to the inner wall of the corresponding inner cylinder 2.

[0104] A first baffle 72 is located at one end of the separator 71 facing the gas-liquid separation structure 3, and the first baffle 72 extends radially and completely covers the radial section of the corresponding inner cylinder 2, so that the outer edge of the first baffle 72 is sealed to the inner wall of the corresponding inner cylinder 2; a fourth through hole 721 for connecting the bidirectional gas passage structure 6 and the first channel 21 is provided in the middle region of the first baffle 72; a fifth through hole 722 for connecting the second channel 22 and the third channel 23 is provided at the edge of the first baffle 72.

[0105] It should be noted that the partition plate 71 has an overall "X"-shaped main structure formed by two symmetrical long strip plates intersecting in the middle, and a long strip plate is also intersecting in the middle of the "X"-shaped main structure to form a "*"-shaped structure; and the channel area formed between two adjacent rectangular long strip plates is the same.

[0106] Furthermore, the partition plate 71 divides the inner cylinder 2 between the bidirectional gas passage structure 6 and the liquid drainage structure 8 into three first channels 21 and three second channels 22, and the first channels 21 and second channels 22 in the inner cylinder 2 are arranged alternately along the circumference. Also, three corresponding fourth through holes 721 and fifth through holes 722 are provided.

[0107] This ensures that the gaseous refrigerant separated by the spiral baffle 31 must first pass through the second channel 22 and the third through hole 26 before flowing into the liquid refrigerant in the area below the heat exchange tube bundle 5 to form bubbles. During this flow process, it will not flow into the first channel 21 through which the gaseous refrigerant formed by the evaporation of the heat exchange tube bundle 5 flows, thus preventing it from affecting the formation of bubbles and improving heat exchange efficiency.

[0108] In some embodiments, such as Figure 2 and Figure 4 As shown, the flow channel separation structure 7 further includes:

[0109] The second baffle 73 is located at the other end of the partition plate 71 facing the drainage structure 8, and the second baffle 73 extends radially and completely covers the radial section of the corresponding inner cylinder 2, so that the outer edge of the second baffle 73 is sealed to the inner wall of the corresponding inner cylinder 2; the second baffle 73 is provided with a sixth through hole 731 for connecting the second channel 22 and the drainage structure 8.

[0110] In this way, the gaseous refrigerant separated by the spiral baffle 31 can only enter the drain structure 8 through the second channel 22, thereby ensuring that the gaseous refrigerant can stably flow from the third through hole 26 into the liquid refrigerant in the area below the heat exchange tube bundle 5 and continuously form bubbles. The growth, rising and breaking of these bubbles will cause disturbances in the liquid refrigerant. These disturbances will destroy the boundary layer of the liquid refrigerant, reduce thermal resistance, and thus improve heat exchange efficiency. At the same time, when the bubbles come into contact with the outer wall of the heat exchange tube bundle 5, they break and easily form vaporization nuclei on the surface, increasing the number of evaporation bubble generation points and promoting bubble growth, thereby improving the heat exchange efficiency on the refrigerant side.

[0111] In some embodiments, such as Figure 2 As shown, the drainage structure 8 includes:

[0112] The inner cylinder 2 located below the flow channel separation structure 7 forms a liquid collection space 81, which is connected to the second channel 22, and the side wall of the liquid collection space 81 away from the flow channel separation structure 7 is provided with a third through hole 26.

[0113] The drain pipe 82 has one end axially disposed within the liquid collection space 81, and the height of the drain pipe 82 within the liquid collection space 81 is lower than the axial height of the liquid collection space 81; the other end of the drain pipe 82 passes through the bottom wall of the inner cylinder 2 and extends to the outside, for connecting to an independent liquid storage device.

[0114] It should be noted that the side wall of the liquid collection space 81 away from the flow channel separation structure 7 is provided with a plurality of third through holes 26 evenly in the circumferential direction, and the adjacent third through holes 26 are not connected.

[0115] In this way, when the falling film heat pump heat exchanger is in heating mode, the high-temperature and high-pressure gaseous refrigerant exchanges heat with the outer wall of the heat exchange tube bundle 5 to generate liquid refrigerant. This liquid refrigerant enters the liquid collection space 81 through the third through hole 26. After the liquid refrigerant in the liquid collection space 81 is higher than the height of the drain pipe 82, the liquid refrigerant can be discharged from the drain pipe 82 to the liquid storage device. This reduces the area of ​​the lower region of the heat exchange tube bundle 5 that is immersed in the liquid refrigerant, increases the heat exchange area for condensation of the heat exchange tube bundle 5 and the high-temperature and high-pressure gaseous refrigerant, and improves the heat exchange efficiency of the falling film heat pump heat exchanger.

[0116] In some embodiments, such as Figure 2 As shown, the bidirectional air passage structure 6 includes:

[0117] The inner cylinder 2 located above the flow channel separation structure 7 forms an air collection space 61, the top of which is connected to the first channel 21; and the same part of the top of the first channel 21 and the top of the air collection space 61 is sealed by welding or sealing gaskets or other designs.

[0118] The second pipe 62 has one end connected to the gas collection space 61 and the other end connected to the compressor.

[0119] A baffle plate 63 is disposed at the top of the gas collection space 61, and the baffle plate 63 extends radially and completely covers the radial cross section of the third channel 23; the baffle plate 63 is used to ensure that the gaseous refrigerant flows from the third channel 23 into the second channel 22.

[0120] It should be noted that the baffle plate 63 is annular, and the inner edge of the baffle plate 63 is sealed to the outer wall of the top of the air collection space 61, and the outer edge of the baffle plate 63 is sealed to the inner wall of the corresponding inner cylinder 2.

[0121] In this way, when the falling film heat pump heat exchanger is in cooling mode, the baffle plate 63 can ensure that the gaseous refrigerant separated by the spiral baffle plate 31 can only enter the second channel 22 from the third channel 23, and the gaseous refrigerant in the first channel 21 can only completely enter the compressor from the gas collection space 61, thus ensuring the airtightness of the gas collection space 61.

[0122] In some embodiments, to ensure the heat exchange efficiency of the heat exchange tube bundle 5, such as Figure 1 and 5 As shown, the heat exchange tube bundle 5 consists of an outer coil 51 and an inner coil 52. The outer coil 51 wraps around the corresponding inner coil 52 to form a concentric circle or multi-layered surrounding structure to expand the heat exchange area.

[0123] Both the outer coil 51 and the inner coil 52 have at least one spiral structure in the radial direction.

[0124] It should be noted that, in this embodiment, the outer coil 51 is a single-layer spiral in the radial direction and the inner coil 52 is a double-layer spiral in the radial direction. In this way, the three-layer spiral of the heat exchange tube bundle 5 corresponds one-to-one with the three rows of liquid equalization holes 411 distributed in a circular shape in the vertical direction. This ensures that the liquid refrigerant dripping from the liquid equalization holes 411 can be evenly distributed to the outer wall surface of the heat exchange tube bundle 5, making the liquid film on the outer wall surface of the heat exchange tube bundle 5 stable and less prone to dry spots, thereby improving the heat exchange efficiency.

[0125] In some embodiments, to ensure that the heat exchange tube bundle 5 can be stably fixed to the inner wall of the outer casing 1, such as... Figure 5 As shown, the inner sidewall of the outer shell 1 is provided with a tube bundle support plate 9 along the axial direction corresponding to the heat exchange tube bundle 5. The tube bundle support plate 9 is provided with a limiting groove 91 along the axial direction and corresponding to the spiral structure. The limiting groove 91 is used to fix the heat exchange tube bundle 5.

[0126] In some embodiments, such as Figure 1 As shown, the outer wall of the outer shell 1 is also sealed with an inlet water chamber 10 and an outlet water chamber 11;

[0127] The water inlet chamber 10 is provided with a water inlet pipe 101, which is used to connect to the water outlet on the user side;

[0128] The water outlet chamber 11 is equipped with a water outlet pipe 111; the water outlet pipe 111 is used to connect to the water inlet on the user side;

[0129] Both ends of the heat exchange tube bundle 5 are provided with bidirectional flow joints 53 that penetrate the outer shell 1, and a sealing structure is provided between the penetration point of the outer shell 1 and the corresponding bidirectional flow joint 53.

[0130] The bidirectional flow joints 53 at the first end of the heat exchange tube bundle 5 are all connected to the inlet water chamber 10, and the bidirectional flow joints 53 at the second end of the heat exchange tube bundle 5 are all connected to the outlet water chamber 11.

[0131] It should be noted that the two ends of the sealing structure proposed in this embodiment extend to the outer side wall and inner side wall of the outer shell 1, respectively, to form a full circumferential seal on the through hole.

[0132] The medium inside the heat exchange tube bundle 5 is usually water, and the flow direction of the medium inside the heat exchange tube bundle 5 is consistent, forming a unidirectional circulation path from the inlet water chamber 10 to the outlet water chamber 11.

[0133] When the falling film heat pump heat exchanger is in cooling mode, the water in the heat exchange tube bundle 5 is converted into chilled water due to heat exchange. This chilled water enters the outlet water chamber 11, and then the outlet water chamber 11 delivers the chilled water to the terminal equipment on the user side through the outlet water pipe 111 to absorb heat and cool the user side. After absorbing heat, the temperature of the chilled water rises. Then, the chilled water with the increased temperature enters the inlet water chamber 10 and the heat exchange tube bundle 5 in sequence through the inlet water pipe 101, forming a cooling cycle.

[0134] When the falling film heat pump heat exchanger is in heating mode, the water in the heat exchange tube bundle 5 becomes hotter due to heat exchange (the temperature is higher than that of chilled water). This hotter water enters the outlet water chamber 11, and then the outlet water chamber 11 delivers the hotter water to the end equipment on the user side through the outlet water pipe 111 to release heat and raise the temperature on the user side. After releasing heat, the temperature of the hotter water drops and enters the inlet water chamber 10 and the heat exchange tube bundle 5 in sequence through the inlet water pipe 101, forming a heating cycle.

[0135] In some embodiments, the present invention also provides an air conditioning unit, the air conditioning unit including the falling film heat pump heat exchanger described above.

[0136] It should be noted that the falling film heat pump heat exchanger is installed vertically inside the air conditioning unit, and the bottom of the falling film heat pump heat exchanger is fixed inside the air conditioning unit by the support bracket 12.

[0137] Thus, as Figure 6 and Figure 7As shown, when the air conditioning unit is in cooling mode, the condenser delivers a two-phase refrigerant (gas and liquid) to the spiral baffle 31 through a throttling device. The spiral baffle 31 then separates the two-phase refrigerant into liquid and gaseous refrigerant. The separated liquid refrigerant collects on the equalization plate 41. Due to the settling effect in the large space, a refrigerant level is formed on the equalization plate 41. The equalization plate 41 then achieves unpressurized gravity equalization, meaning that the liquid refrigerant drips evenly and slowly downwards from the equalization holes 411 of the equalization plate 41 onto the outer wall of the heat exchange tube bundle 5 under the action of gravity for heat exchange and evaporation, forming gaseous refrigerant. Furthermore, the dripping process reduces liquid refrigerant splashing, weakens the liquid column drift phenomenon caused by gaseous refrigerant turbulence, and enhances the liquid refrigerant's properties. The uniformity of liquid distribution reduces dry spots on the outer wall of the heat exchange tube bundle 5, and the area below the heat exchange tube bundle 5 and the third through hole 26 are immersed in the liquid refrigerant. At the same time, the separated gaseous refrigerant enters the liquid collection space 81 after passing through the first through hole 24, the third channel 23, the fifth through hole 722, and the second channel 22 in sequence, and then exits from the third through hole 26 and forms bubbles. The growth, rise and collapse of these bubbles will cause disturbance to the liquid refrigerant. This disturbance will destroy the boundary layer of the liquid refrigerant and reduce thermal resistance, thereby improving the heat exchange efficiency. At the same time, the bubbles break when they come into contact with the outer wall of the heat exchange tube bundle 5, which easily forms vaporization nuclei on the surface, increases the number of evaporation bubble generation points and promotes bubble growth, thereby improving the heat exchange efficiency of the falling film heat pump heat exchanger.

[0138] Then, the gaseous refrigerant in the area where the heat exchange tube bundle 5 is located will pass through the second through hole 25, the first channel 21, and the fourth through hole 721 in sequence before entering the gas collection space 61, and then be sucked away by the compressor, thus completing the refrigerant cycle during the refrigeration operation.

[0139] The water in the heat exchange tube bundle 5 is converted into chilled water due to heat exchange. The chilled water enters the outlet water chamber 11, and then the outlet water chamber 11 delivers the chilled water to the terminal equipment on the user side through the outlet water pipe 111 to absorb heat and cool down the user side. After absorbing heat, the temperature of the chilled water rises. Then, the chilled water with the increased temperature enters the inlet water chamber 10 and the heat exchange tube bundle 5 in sequence through the inlet water pipe 101, forming a refrigeration cycle on the user side.

[0140] like Figure 8As shown, when the air conditioning unit is in heating mode, the compressor discharges high-temperature, high-pressure gaseous refrigerant into the gas collection space 61. The gaseous refrigerant in the gas collection space 61 passes through the first channel 21 and the second through-hole 25 before being discharged to the outer wall of the heat exchange tube bundle 5 for condensation and heat exchange. The high-temperature, high-pressure gaseous refrigerant releases heat and condenses into liquid refrigerant on the outer wall of the heat exchange tube bundle 5. The liquid refrigerant settles and collects in the lower area of ​​the heat exchange tube bundle 5. At this time, the liquid refrigerant enters the liquid collection space 81 through the third through-hole 26. Once the liquid refrigerant level in compartment 81 is higher than the outlet height of drain pipe 82, the liquid refrigerant will be discharged to the outside and stored in a liquid storage device that is independently set up with the falling film heat pump heat exchanger. Then, the liquid refrigerant in the liquid storage device will pass through a throttling valve to reach the evaporator. This ensures that the area of ​​the lower part of the heat exchange tube bundle 5 is reduced and immersed in the liquid refrigerant, thereby increasing the heat exchange area for condensation of the heat exchange tube bundle 5 and the high-temperature and high-pressure gaseous refrigerant, improving the heat exchange efficiency of the falling film heat pump heat exchanger, and thus completing the refrigerant circulation during heating.

[0141] At this time, the water in the heat exchange tube bundle 5 becomes water with a higher temperature due to heat exchange. This water with a higher temperature enters the outlet water chamber 11, and then the outlet water chamber 11 transports the water with a higher temperature to the terminal equipment on the user side through the outlet water pipe 111 to release heat and raise the temperature on the user side. After releasing heat, the temperature of the water with a higher temperature drops and enters the inlet water chamber 10 and the heat exchange tube bundle 5 in sequence through the inlet water pipe 101, forming a heating cycle on the user side.

[0142] Obviously, the embodiments described above are only some embodiments of this utility model, not all embodiments. The accompanying drawings show preferred embodiments of this utility model, but do not limit the patent scope of this utility model. This utility model can be implemented in many different forms; rather, the purpose of providing these embodiments is to provide a more thorough and comprehensive understanding of the disclosure of this utility model. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing specific embodiments, or make equivalent substitutions for some of the technical features. Any equivalent structures made using the content of this utility model specification and drawings, directly or indirectly applied to other related technical fields, are similarly within the patent protection scope of this utility model.

Claims

1. A falling film heat pump exchanger, characterized in that include: The outer shell (1) and inner cylinder (2) are designed in a coaxial nested manner, and the outer shell (1) and inner cylinder (2) are provided with a gas-liquid separation structure (3), a liquid equalization structure (4) and a heat exchange tube bundle (5) in sequence along the axial direction; The inner cylinder (2) is provided with a bidirectional gas passage structure (6), a flow channel separation structure (7) and a liquid drainage structure (8) in sequence along the same axis; The flow channel separation structure (7) divides the corresponding inner cylinder (2) into a first channel (21) that communicates with the bidirectional gas path structure (6) and a second channel (22) that communicates with the drain structure (8); The bidirectional air passage structure (6) and the corresponding inner cylinder (2) form a third channel (23) that communicates with the second channel (22); The inner cylinder (2) is provided with a first through hole (24) corresponding to the third channel (23), the first channel (21) is provided with a second through hole (25) corresponding to the heat exchange tube bundle (5), and the inner cylinder (2) is provided with a third through hole (26) corresponding to the drain structure (8). The gas-liquid separation structure (3) is used to connect to the condenser, and the bidirectional gas path structure (6) is used to connect to the compressor.

2. The falling-film heat pump heat exchanger according to claim 1, characterized in that The flow channel separation structure (7) includes: A partition plate (71) divides the inner cylinder (2) between the bidirectional gas passage structure (6) and the drainage structure (8) into a first channel (21) and a second channel (22) along the axial direction; A first baffle (72) is located at one end of the partition plate (71) facing the gas-liquid separation structure (3), and the first baffle (72) extends radially and completely covers the radial section of the corresponding inner cylinder (2); the middle region of the first baffle (72) is provided with a fourth through hole (721) for connecting the bidirectional gas passage structure (6) and the first channel (21); the edge of the first baffle (72) is provided with a fifth through hole (722) for connecting the second channel (22) and the third channel (23).

3. The falling-film heat pump heat exchanger according to claim 2, characterized in that The flow channel separation structure (7) also includes: A second baffle (73) is located at the other end of the partition plate (71) facing the drainage structure (8), and the second baffle (73) extends radially and completely covers the radial section of the corresponding inner cylinder (2); the second baffle (73) is provided with a sixth through hole (731) for connecting the second channel (22) and the drainage structure (8).

4. The falling-film heat pump heat exchanger according to claim 1, characterized in that The inner cylinder (2) is provided with a seventh through hole (27) corresponding to the liquid equalization structure (4) and communicating with the second channel (22). The seventh through hole (27) is located below the first through hole (24) and is used to transport the gaseous refrigerant on the liquid equalization structure (4) to the second channel (22).

5. The falling-film heat pump heat exchanger according to claim 1, characterized in that The homogenization structure (4) includes: A liquid distribution plate (41) extends radially and completely covers the radial section of the annular gap between the corresponding inner cylinder (2) and outer shell (1); the liquid distribution plate (41) is provided with at least one row of liquid distribution through holes (411) in the circumferential direction, the liquid distribution through holes (411) being used to uniformly drip liquid refrigerant onto the outer wall of the heat exchange tube bundle (5) below; A diversion plate (42) is located at the edge of the liquid equalization plate (41) and is arranged circumferentially toward the gas-liquid separation structure (3). The diversion plate (42) is in close contact with the inner wall of the corresponding outer shell (1). The diversion plate (42) is used to gather the liquid refrigerant on the inner wall of the outer shell (1) onto the liquid equalization plate (41).

6. The falling-film heat pump heat exchanger according to claim 1, characterized in that The drainage structure (8) includes: The inner cylinder (2) located below the flow channel separation structure (7) forms a liquid collection space (81), which is connected to the second channel (22), and the side wall of the liquid collection space (81) away from the flow channel separation structure (7) is provided with a third through hole (26). The drain pipe (82) has one end axially disposed in the liquid collection space (81), and the height of the drain pipe (82) in the liquid collection space (81) is lower than the axial height of the liquid collection space (81); the other end of the drain pipe (82) penetrates the bottom wall of the inner cylinder (2) and extends to the outside, for connecting an independent liquid storage device.

7. The falling-film heat pump heat exchanger according to claim 1, characterized in that The gas-liquid separation structure (3) includes a spiral baffle (31) arranged spirally along the axial direction. The spiral baffle (31) extends radially and completely covers the radial section of the annular gap between the corresponding inner cylinder (2) and outer shell (1). The outer casing (1) located above the spiral baffle (31) is connected to a first pipe (32), which is used to connect to the condenser through a throttling device.

8. The falling-film heat pump heat exchanger according to claim 7, characterized in that The inner cylinder (2) is provided with a first through hole (24) in a spiral shape arranged along the axial direction, corresponding to the spiral baffle (31).

9. The falling-film heat pump heat exchanger according to claim 1, characterized in that The bidirectional air passage structure (6) includes: The gas collection space (61) formed by the inner cylinder (2) located above the flow channel separation structure (7) is connected to the first channel (21); The second pipe (62) has one end connected to the gas collection space (61) and the other end connected to the compressor. A baffle plate (63) is disposed at the top of the gas collection space (61), and the baffle plate (63) extends radially and completely covers the radial section of the third channel (23); the baffle plate (63) is used to ensure that the gaseous refrigerant flows from the third channel (23) into the second channel (22).

10. The falling-film heat pump heat exchanger according to claim 1, characterized in that The heat exchange tube bundle (5) consists of an outer coil (51) and an inner coil (52), with the outer coil (51) wrapping around the corresponding inner coil (52). Furthermore, both the outer coil (51) and the inner coil (52) have at least one spiral structure along the radial direction.

11. The falling-film heat pump heat exchanger according to claim 10, characterized in that The inner wall of the outer shell (1) is provided with a tube bundle support plate (9) along the axial direction corresponding to the heat exchange tube bundle (5). The tube bundle support plate (9) is provided with a limiting groove (91) along the axial direction and corresponding to the spiral structure. The limiting groove (91) is used to fix the heat exchange tube bundle (5).

12. The falling-film heat pump heat exchanger according to claim 1, characterized in that The outer wall of the outer shell (1) is also sealed with an inlet water chamber (10) and an outlet water chamber (11); The water inlet chamber (10) is provided with a water inlet pipe (101), which is used to connect to the water outlet on the user side; The water outlet chamber (11) is equipped with a water outlet pipe (111); the water outlet pipe (111) is used to connect to the water inlet on the user side; Both ends of the heat exchange tube bundle (5) are provided with bidirectional flow joints (53) that penetrate the outer shell (1), and a sealing structure is provided between the penetration point of the outer shell (1) and the corresponding bidirectional flow joint (53). The bidirectional flow joints (53) at the first end of the heat exchange tube bundle (5) are all connected to the inlet water chamber (10), and the bidirectional flow joints (53) at the second end of the heat exchange tube bundle (5) are all connected to the outlet water chamber (11).

13. An air conditioning unit characterized by, The air conditioning unit includes the falling film heat pump heat exchanger as described in any one of claims 1-12.

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