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 homogenizing 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] The present invention relates to the field of refrigeration technology, and in particular to a falling film heat pump heat exchanger and an air conditioning unit. Background Art

[0002] Heat pump units have been increasingly widely used due to their ability to combine cooling and heating functions. Existing heat pump units generally use falling film heat pump heat exchangers.

[0003] The falling film heat pump heat exchanger operates as follows: during cooling, liquid refrigerant drips onto the outer wall of the heat exchange tubes, evaporating to absorb heat from the chilled water inside. During heating, the gaseous refrigerant condenses on the outside of the tubes, transferring heat to the cooling water inside. This eliminates the uneven distribution of liquid and gas within the tubes and the low flow rate of the refrigerant outside the tubes, which are common in dry heat exchangers. Furthermore, during cooling operation, thin film evaporation occurs on the outside of the tubes, eliminating the impact of a static liquid column on heat transfer efficiency, offering significant advantages over flooded heat exchangers.

[0004] When a falling-film heat pump heat exchanger is operating in cooling mode, the gas-liquid mixed refrigerant is evenly distributed horizontally through the liquid distributor on the upper part of the shell before dripping down the tubes from top to bottom onto the outer surfaces of the heat exchange tubes. Because the pressurized gas-liquid mixed refrigerant in the liquid distributor impacts the outer surfaces of the heat exchange tubes in the upper tube area, the flow rate is high, which can easily cause liquid splashing. Furthermore, as the liquid refrigerant drips down the tubes from top to bottom, it is easily disturbed by the gas from the liquid distributor, causing the liquid column to drift, which in turn forms dry spots on the outer surfaces of the heat exchange tubes, reducing the heat transfer efficiency of the heat exchanger. As the liquid refrigerant drips down the outer tube walls from top to bottom and continuously evaporates, there is less liquid refrigerant in the lower tube area, which can easily cause dry spots.

[0005] Falling-film heat pumps function as condensers during heating operations and also serve as liquid storage. This is particularly true when the air conditioner's evaporator utilizes an air-cooled finned heat exchanger. The falling-film heat pump acts as a reservoir to store large amounts of liquid refrigerant. The lower tube area is submerged in liquid refrigerant, reducing the heat exchange area available for condensing the gaseous refrigerant entering the falling-film heat pump from the compressor exhaust. This results in higher condensing temperatures and lower energy efficiency.

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

[0007] The present invention provides a falling film heat pump heat exchanger and an air conditioning unit, which are used to solve the problems in the prior art that when the falling film heat pump heat exchanger is in a cooling condition, dry spots are easily generated on the outer wall surface of the heat exchange tube, thereby reducing the heat transfer efficiency of the heat exchanger; and when it is in a heating condition, the heat exchange area of the heat exchange tube is not fully utilized.

[0008] The technical solution of the present invention 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 distribution structure and a heat exchange tube bundle are arranged in sequence along the axial direction between the outer shell and the inner cylinder;

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

[0011] The flow channel separation structure divides the corresponding inner cylinder into a first channel communicating with the bidirectional gas path structure and a second channel communicating with the liquid discharge structure;

[0012] A third channel communicating with the second channel is formed between the bidirectional air path structure and the corresponding inner cylinder;

[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 drainage structure;

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

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

[0016] a partition plate, the partition plate dividing the inner cylinder between the bidirectional air path structure and the liquid discharge 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 corresponding radial cross-section of the inner cylinder; a fourth through hole is provided in the middle area of the first baffle for connecting the two-way 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 further includes:

[0019] A second baffle is located at the other end of the partition plate toward the drainage structure, and the second baffle extends radially and completely covers the corresponding radial cross-section of the inner cylinder; a sixth through hole is provided on the second baffle 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 balancing structure and connected to the second channel. The seventh through hole is located below the first through hole. The seventh through hole is used to transport the gaseous refrigerant on the liquid balancing structure to the second channel.

[0021] Furthermore, the liquid-homogenizing structure includes:

[0022] A liquid balancing plate, the liquid balancing plate extending radially and completely covering the radial cross-section of the annular gap between the corresponding inner cylinder and the outer shell; the liquid balancing plate is provided with at least one row of liquid balancing through holes along the circumferential direction, the liquid balancing through holes being used to evenly drip the liquid refrigerant onto the outer side wall of the heat exchange tube bundle below;

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

[0024] Furthermore, the drainage structure includes:

[0025] A liquid collecting space is formed by the inner cylinder below the flow channel separation structure, the liquid collecting space is communicated with the second channel, and a third through hole is provided on a side wall of an end of the liquid collecting space away from the flow channel separation structure;

[0026] A drain pipe, one end of which is axially arranged in the liquid collecting space, and the height of the drain pipe in the liquid collecting space is lower than the axial height of the liquid collecting space; the other end of the drain pipe passes through 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 in an axial direction, wherein the spiral baffle plate extends in a radial direction and completely covers a radial cross section of the annular gap between the corresponding inner cylinder and the outer cylinder;

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

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

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

[0031] an air collecting space formed by the inner cylinder above the flow channel separation structure, the air collecting space being in communication with the first channel;

[0032] a second pipe, one end of the second pipe being in communication with the gas collecting space, and the other end of the second pipe being in communication with a compressor;

[0033] An air baffle is arranged at the top of the air collecting space, and the air baffle extends radially and completely covers the radial cross-section of the third channel; the air baffle is used to ensure that the 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, and the outer coil is wrapped around the corresponding inner coil;

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

[0036] Furthermore, a tube bundle support plate is axially provided on the inner side wall of the outer shell corresponding to the heat exchange tube bundle, and the tube bundle support plate is axially provided with a limiting groove corresponding to the spiral structure, and the limiting groove is used to fix the heat exchange tube bundle.

[0037] Furthermore, the outer side wall of the outer shell is also sealedly connected to a water inlet chamber and a water outlet chamber;

[0038] The water inlet chamber is provided with a water inlet pipe, and the water inlet pipe is used to communicate with the water outlet end on the user side;

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

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

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

[0042] The present invention further provides an air-conditioning unit, comprising 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 the present invention is in a cooling state, the liquid refrigerant drips down evenly and slowly to the outer wall surface of the heat exchange tube bundle through the liquid uniformity structure, and the lower area 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 forms bubbles in the liquid refrigerant in the lower area of the heat exchange tube bundle. The growth, rise and rupture of the bubbles will cause disturbances in the liquid refrigerant. Such disturbances will destroy the boundary layer of the liquid refrigerant and reduce thermal resistance, thereby improving heat exchange efficiency. At the same time, the bubbles will break when contacting the outer wall surface of the heat exchange tube bundle, and it is easy to form vaporization cores on the surface, which increases the generation points of evaporation bubbles and promotes the growth of bubbles, 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 operation, 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. The liquid refrigerant then enters the drainage structure through the third through hole and is discharged to an independently arranged liquid storage device. This ensures that the area of the lower area 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Unless otherwise defined, all technical and scientific terms used herein have the same meanings as commonly understood by those skilled in the art to which this invention belongs. The terms used in the specification of the application are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The terms "including" and "having" and any variations thereof in the specification and claims of the present invention and the accompanying drawings are intended to cover non-exclusive inclusions. The terms "first" and "second" in the specification and claims of the present invention and the accompanying drawings are used to distinguish different objects, not to describe a specific order.

[0047] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0048] Figure 1 This is a schematic diagram of the internal structure of the falling film heat pump heat exchanger proposed in the present invention;

[0049] Figure 2 This is a schematic diagram of the internal structure of the outer shell proposed by the present invention;

[0050] Figure 3 This is a schematic structural diagram of the inner cylinder proposed in the present invention;

[0051] Figure 4 This is an exploded schematic diagram of the flow channel separation structure proposed in the present invention;

[0052] Figure 5 This is an exploded schematic diagram of the heat exchange tube bundle and the tube bundle support plate proposed in the present invention;

[0053] Figure 6 This is a schematic diagram of the refrigerant flow when the falling film heat pump heat exchanger proposed by the present invention is in a cooling state;

[0054] Figure 7 This is a schematic diagram of the flow of refrigerant in the outer shell of the falling film heat pump heat exchanger proposed by the present invention when it is in cooling mode;

[0055] Figure 8 This is a schematic diagram of the refrigerant flow when the falling film heat pump heat exchanger proposed by the present invention is in heating condition.

[0056] Reference numerals:

[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 pipeline;

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

[0061] 5. Heat exchange tube bundle; 51. Outer coil; 52. Inner coil; 53. Bidirectional flow joint;

[0062] 6. Two-way air path structure; 61. Air collecting space; 62. Second pipeline; 63. Air baffle;

[0063] 7. Flow channel separation structure; 71. Separation 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 collecting space; 82. Drain 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 DESCRIPTION

[0069] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely used to explain the present invention and are not intended to limit the present invention. Thus, a feature indicated in this specification will be used to illustrate one of the features of an embodiment of the present invention, rather than implying that each embodiment of the present invention must have the described features. In addition, it should be noted that this specification describes many features. Although certain features can be combined together to illustrate possible system designs, these features can also be used in other combinations that are not explicitly stated. Thus, unless otherwise stated, the described combinations are not intended to be limiting.

[0070] The principle and structure of the present invention are described in detail below with reference to the accompanying drawings and embodiments.

[0071] In some embodiments, as Figure 1 and Figure 2 As shown, the present invention proposes a falling film heat pump heat exchanger, comprising:

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

[0073] The inner cylinder 2 is provided with a bidirectional gas path structure 6, a flow channel separation structure 7 and a liquid discharge structure 8 in sequence along the same axis;

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

[0075] A third channel 23 communicating with the second channel 22 is formed between the bidirectional gas path structure 6 and the corresponding inner cylinder 2;

[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] Among them, the gas-liquid separation structure 3 is used to connect to the condenser through the throttling device, the two-way gas path structure 6 is used to connect to the compressor, and the drainage structure 8 is used to discharge the liquid refrigerant to an independent liquid storage device (not shown, the same throughout).

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

[0079] One end with a two-way gas path structure 6 is the top end of the falling film heat pump heat exchanger, and the end with a drainage structure 8 is the bottom end of the falling film heat pump heat exchanger. Therefore, a gas-liquid separation structure 3, a liquid equalization structure 4 and a heat exchange tube bundle 5 are sequentially provided between the outer shell 1 and the inner cylinder 2 along the top to the bottom end; a two-way gas path structure 6, a flow channel separation structure 7 and a drainage structure 8 are sequentially provided inside the inner cylinder 2 along the top to the bottom end.

[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 into a low-pressure gas-liquid two-phase refrigerant.

[0081] Among them, when the falling film heat pump heat exchanger is in cooling condition (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, and the separated liquid refrigerant converges into the liquid-equalizing structure 4 along the inner wall of the corresponding outer shell 1 and / or the gas-liquid separation structure 3, and under the action of large-space sedimentation, a refrigerant liquid level will be formed on the liquid-equalizing structure 4, and then the liquid-equalizing structure 4 will realize gravity-equalizing without pressure, that is, the liquid refrigerant will drip down evenly and slowly from the liquid-equalizing structure 4 to the outer wall surface of the heat exchange tube bundle 5 under the action of gravity. Heat exchange evaporates and forms a gaseous refrigerant; at the same time, the separated gaseous refrigerant passes through the first through hole 24, the third channel 23, the second channel 22, and the drainage structure 8 in sequence, and is discharged from the third through hole 26 to the lower area of the heat exchange tube bundle 5. Then, the separated gaseous refrigerant is mixed with the gaseous refrigerant formed by heat exchange. The mixed gaseous refrigerant passes through the second through hole 25 and the first channel 21 in sequence and enters the two-way gas path structure 6, and then the two-way gas path structure 6 transports the gaseous refrigerant to the compressor.

[0082] Of course, the liquid balancing structure 4 realizes gravity liquid balancing without pressure, that is, the liquid balancing structure 4 evenly drips the liquid refrigerant downward to the outer wall of the heat exchange tube bundle 5 at a low flow rate, reducing the splashing of the liquid refrigerant, and the interval between the liquid balancing structure 4 and the heat exchange tube bundle 5 is small, and the second through hole 25 located in the heat exchange tube bundle 5 area is below the liquid balancing structure 4. Therefore, in the process of the liquid refrigerant dripping from top to bottom along the heat exchange tube bundle 5, the liquid column drift phenomenon caused by the liquid refrigerant dripping caused by the gaseous refrigerant blowing is weakened, so as to enhance the liquid distribution uniformity of the liquid refrigerant, reduce the dry spots formed on the outer wall of the heat exchange tube bundle 5, and ensure the heat transfer efficiency or heat exchange efficiency of the falling film heat pump heat exchanger; and due to the cooling demand, the liquid balancing structure 4 drips too much liquid refrigerant evenly downward, and at this time it will be between the outer shell 1 and the inner cylinder 2. A refrigerant liquid level is formed below the annular gap to ensure that the lower area of the heat exchange tube bundle 5 is partially immersed in the liquid refrigerant, and it is necessary to ensure that the third through hole 26 is also immersed in the liquid refrigerant. In this way, dry spots are not easily formed on the outer wall surface of the lower area of the heat exchange tube bundle 5. At this time, after the gaseous refrigerant enters the drainage structure 8, it can only be discharged from the third through hole 26. At this time, the gaseous refrigerant will form bubbles in the liquid refrigerant that is not immersed in the heat exchange tube bundle 5. The growth, rise and rupture of the bubbles will cause disturbances in 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 will break when they contact the outer wall surface of the heat exchange tube bundle 5, and it is easy to form vaporization cores on the surface, increase the evaporation bubble generation points and promote bubble growth, thereby improving the evaporation heat transfer efficiency or heat exchange efficiency on the refrigerant side.

[0083] When the falling film heat pump heat exchanger is in heating condition (such as Figure 8 As shown), the compressor will discharge high-temperature and high-pressure gaseous refrigerant to the two-way gas path structure 6. The gaseous refrigerant passes through the first channel 21 and the second through hole 25 in sequence and is discharged to the outer wall of the heat exchange tube bundle 5 for condensation and heat exchange. The high-temperature and high-pressure gaseous refrigerant releases heat on the outer wall of the heat exchange tube bundle 5 and condenses into liquid refrigerant. The liquid refrigerant settles and gathers in the lower area of the heat exchange tube bundle 5. At this time, the liquid refrigerant will enter the drainage structure 8 through the third through hole 26. When the liquid refrigerant in the drainage structure 8 reaches a preset height, it will be discharged to the outside and to a liquid storage device independently provided with the falling film heat pump heat exchanger. The liquid refrigerant in the liquid storage device then passes through the throttle valve to reach the evaporator. In this way, the area of the lower area of the heat exchange tube bundle 5 immersed in the liquid refrigerant is reduced, the heat exchange area for the condensation of the heat exchange tube bundle 5 and the high-temperature and high-pressure gaseous refrigerant is increased, and the heat exchange efficiency of the falling film heat pump heat exchanger is improved.

[0084] Among them, the flow of refrigerant during refrigeration conditions is: condenser → throttling device → gas-liquid separation structure 3, and then the gas-liquid separation structure 3 will separate the gas-liquid two-phase refrigerant into liquid refrigerant and gaseous refrigerant. At this time, the flow of the separated liquid refrigerant is: gas-liquid separation structure 3 → liquid equalization structure 4 → heat exchange tube bundle 5 → second through hole 25 → first channel 21 → two-way gas path structure 6 → compressor; the flow of the separated gaseous refrigerant at this time is: gas-liquid separation structure 3 → first through hole 24 → third channel 23 → second channel 22 → drainage structure 8 → third through hole 26 → heat exchange tube bundle 5 → second through hole 25 → first channel 21 → two-way gas path structure 6 → compressor.

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

[0086] Therefore, when the falling film heat pump heat exchanger proposed in the present invention is in a cooling condition, dry spots are not easily generated 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 it is in a heating condition, the heat exchange area of the heat exchange tube bundle 5 is fully utilized, thereby improving the heat exchange efficiency of the falling film heat pump heat exchanger.

[0087] In some embodiments, as Figure 2 As shown, the gas-liquid separation structure 3 includes a spiral baffle 31 arranged in an axial spiral direction, and the spiral baffle 31 extends radially and completely covers the radial cross section of the corresponding annular gap between the inner cylinder 2 and the outer cylinder 1;

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

[0089] It should be noted that a circular through hole is axially provided in the middle of the spiral baffle 31, the inner edge of the spiral baffle 31 is sealedly connected to the outer wall of the corresponding inner cylinder 2, and the outer edge of the spiral baffle 31 is sealedly connected to the inner wall of the corresponding outer cylinder 1.

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

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

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

[0093] A liquid balancing plate 41 extends radially and completely covers the radial cross-section of the annular gap between the inner cylinder 2 and the outer shell 1. The liquid balancing plate 41 is provided with at least one row of liquid balancing holes 411 along the circumferential direction. The liquid balancing holes 411 are used to evenly drip liquid refrigerant onto the outer wall of the heat exchange tube bundle 5 below.

[0094] The guide plate 42 is located at the edge of the liquid balancing plate 41 and is circumferentially arranged toward the gas-liquid separation structure 3, and the guide plate 42 is tightly attached to the corresponding inner wall of the outer shell 1. The guide plate 42 is used to gather the liquid refrigerant on the inner wall of the outer shell 1 to the liquid balancing plate 41.

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

[0096] Therefore, when the falling film heat pump heat exchanger is in the cooling state, the gas-liquid separation structure 3 separates the input gas-liquid two-phase refrigerant into liquid refrigerant and gaseous refrigerant, and the separated liquid refrigerant flows downward along the spiral deflector 31 and converges to the liquid equalizing plate 41, and some of the liquid refrigerant on the inner wall of the corresponding outer shell 1 will continuously converge to the liquid equalizing plate 41 along the guide plate 42; then, under the action of large-space sedimentation, a refrigerant liquid level will be formed above the liquid equalizing plate 41, which Under the action of gravity, the sample liquid refrigerant drips downward from the liquid balancing through hole 411 evenly to the outer wall of the heat exchange tube bundle 5, and the dripping speed is slow to reduce the splashing of the liquid refrigerant; and in the process of the liquid refrigerant dripping from top to bottom along the heat exchange tube bundle 5, the liquid column drift phenomenon caused by the liquid refrigerant dripping caused by the blowing of the gaseous refrigerant can be weakened, so as to enhance the uniformity of the liquid distribution of the liquid refrigerant, reduce the dry spots formed on the outer wall of the heat exchange tube bundle 5, and ensure the heat exchange efficiency of the falling film heat pump heat exchanger.

[0097] The second through hole 25 is located below the first channel 21. If the second through hole 25 is located above the first channel 21, it is easy for droplets of dripping liquid refrigerant to enter the first channel 21 from the second through hole 25, which may cause the compressor to inhale liquid.

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

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

[0100] It should be noted that a plurality of seventh through holes 27 are provided along the circumferential direction of the corresponding inner cylinder 2 , and adjacent seventh through holes 27 are not connected.

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

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

[0103] a partition plate 71 , which axially divides the inner cylinder 2 between the bidirectional air path structure 6 and the liquid drainage structure 8 into a first channel 21 and a second channel 22 , and an outer edge of the partition plate 71 is sealedly connected to the inner sidewall of the corresponding inner cylinder 2 ;

[0104] The 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 cross-section of the corresponding inner cylinder 2, so that the outer edge of the first baffle 72 is sealed with the inner side wall of the corresponding inner cylinder 2; the middle area of the first baffle 72 is provided with a fourth through hole 721 for connecting the two-way gas path 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.

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

[0106] The partition plate 71 divides the inner cylinder 2 between the bidirectional air path structure 6 and the liquid drainage structure 8 into three first channels 21 and three second channels 22. The first channels 21 and second channels 22 are arranged in the inner cylinder 2 in a circumferentially spaced order. Three fourth through holes 721 and three fifth through holes 722 are also provided.

[0107] In this way, it is ensured 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 where the gaseous refrigerant formed by evaporation of the heat exchange tube bundle 5 flows, thereby preventing the generation of bubbles from being affected, thereby improving the heat exchange efficiency.

[0108] In some embodiments, 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 toward the drainage structure 8, and the second baffle 73 extends radially and completely covers the radial cross-section of the corresponding inner cylinder 2, so that the outer edge of the second baffle 73 is sealedly connected to the inner side 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, it can be ensured that the gaseous refrigerant separated by the spiral baffle 31 can only enter the drainage structure 8 from 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 continue to form bubbles. The growth, rise and rupture of the bubbles will cause disturbances in 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 will break when they contact the outer wall of the heat exchange tube bundle 5, and it is easy to form vaporization cores on the surface, increase the evaporation bubble generation points and promote bubble growth, thereby improving the heat exchange efficiency on the refrigerant side.

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

[0112] A liquid collecting space 81 is formed in the inner cylinder 2 below the flow channel separation structure 7. The liquid collecting space 81 is communicated with the second channel 22. A third through hole 26 is provided on a side wall of the liquid collecting space 81 at one end away from the flow channel separation structure 7.

[0113] The drain pipe 82 has one end axially arranged in the liquid collecting space 81, and the height of the drain pipe 82 in the liquid collecting space 81 is lower than the axial height of the liquid collecting 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 a plurality of third through holes 26 are evenly arranged in the circumferential direction of the side wall of the liquid collecting space 81 at one end away from the flow channel separation structure 7 , and adjacent third through holes 26 are not connected.

[0115] In this way, when the falling film heat pump heat exchanger is in the heating condition, 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, and the liquid refrigerant enters the liquid collection space 81 from 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, thereby reducing the area of the lower area of the heat exchange tube bundle 5 immersed in the liquid refrigerant, increasing the heat exchange area for condensation between the heat exchange tube bundle 5 and the high-temperature and high-pressure gaseous refrigerant, and improving the heat exchange efficiency of the falling film heat pump heat exchanger.

[0116] In some embodiments, as Figure 2 As shown, the bidirectional gas path structure 6 includes:

[0117] The inner cylinder 2 located above the flow channel separation structure 7 forms an air collecting space 61, and the top of the air collecting space 61 is connected to the first channel 21; and the first channel 21 and the top of the air collecting space 61 are welded or designed with a sealing gasket to form a sealing structure.

[0118] a second pipe 62 , one end of which is in communication with the air collecting space 61 , and the other end of which is in communication with the compressor;

[0119] The air baffle 63 is arranged at the top of the air collecting space 61 and extends radially and completely covers the radial cross-section of the third channel 23 ; the air baffle 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 air baffle 63 is annular, and the inner edge of the air baffle 63 is sealed to the outer wall of the top of the air collecting space 61 , and the outer edge of the air baffle 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 the cooling condition, the air baffle 63 can ensure that the gaseous refrigerant separated by the spiral baffle 31 can only enter the second channel 22 from the third channel 23, and the gaseous refrigerant in the first channel 21 can only enter the compressor completely from the air collecting space 61, thereby ensuring the air tightness of the air collecting space 61.

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

[0123] The outer coil 51 and the inner coil 52 each have at least one spiral structure along the radial direction.

[0124] It should be noted that, in this embodiment, the outer ring coil 51 is a single-layer spiral in the radial direction, and the inner ring 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 will correspond one-to-one with the three rows of liquid-distributing holes 411 distributed in a circumferential direction in the vertical direction, ensuring that the liquid refrigerant dripping from the liquid-distributing holes 411 can be evenly distributed to the outer wall surface of the heat exchange tube bundle 5, so that the liquid film on the outer wall surface of the heat exchange tube bundle 5 is stable and dry spots are not easily formed, thereby improving the heat exchange efficiency.

[0125] In some embodiments, in order to ensure that the heat exchange tube bundle 5 can be stably fixed on the inner wall of the outer shell 1, as shown in FIG. Figure 5 As shown, the inner side wall of the outer shell 1 is axially provided with a tube bundle support plate 9 corresponding to the heat exchange tube bundle 5, and the tube bundle support plate 9 is axially provided with a limiting groove 91 corresponding to the spiral structure, and the limiting groove 91 is used to fix the heat exchange tube bundle 5.

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

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

[0128] The water outlet chamber 11 is provided with a water outlet pipe 111; the water outlet pipe 111 is used to communicate with the water inlet end 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 of the outer shell 1 and the corresponding bidirectional flow joints 53;

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

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

[0132] The medium in the heat exchange tube bundle 5 is usually water, and the flow direction of the medium in the heat exchange tube bundle 5 is consistent, forming a one-way circulation passage from the water inlet chamber 10 to the water outlet chamber 11.

[0133] When the falling film heat pump heat exchanger is in the cooling condition, the water in the heat exchange tube bundle 5 forms chilled water due to heat exchange. The chilled water enters the water outlet chamber 11, and then the water outlet chamber 11 transports the chilled water to the terminal equipment on the user side through the water outlet pipe 111 to absorb heat and cool the user side. After the chilled water absorbs heat, its temperature rises, and then the chilled water with increased temperature enters the water inlet chamber 10 and the heat exchange tube bundle 5 in sequence through the water inlet pipe 101, forming a refrigeration cycle.

[0134] When the falling film heat pump heat exchanger is in the heating condition, the water in the heat exchange tube bundle 5 forms water with a higher temperature (the temperature is higher than the chilled water) due to heat exchange. The water with a higher temperature enters the water outlet chamber 11, and then the water outlet chamber 11 transports the water with a higher temperature to the terminal equipment on the user side through the water outlet pipe 111 to release heat and heat the user side. After the higher temperature water releases heat, the temperature drops and enters the water inlet chamber 10 and the heat exchange tube bundle 5 in turn through the water inlet pipe 101, forming a heating cycle.

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

[0136] It should be noted that the falling film heat pump heat exchanger is vertically arranged in the air-conditioning unit, and the bottom of the falling film heat pump heat exchanger is fixed in the air-conditioning unit through a supporting bracket 12.

[0137] In this way, Figure 6 and Figure 7As shown, when the air-conditioning unit is in the cooling condition, the condenser transports the gas-liquid two-phase refrigerant to the spiral baffle 31 through the throttling device, and then the spiral baffle 31 separates the gas-liquid two-phase refrigerant into liquid refrigerant and gaseous refrigerant, and the separated liquid refrigerant will be collected on the liquid equalizing plate 41, and under the action of sedimentation in a large space, a refrigerant liquid level will be formed on the liquid equalizing plate 41, and then the liquid equalizing plate 41 will realize gravity equalization without pressure, that is, the liquid refrigerant will be dripped down evenly and slowly from the liquid equalizing hole 411 of the liquid equalizing plate 41 under the action of gravity to the outer wall surface of the heat exchange tube bundle 5 for heat exchange evaporation and form gaseous refrigerant, and the dripping process can reduce the splashing of liquid refrigerant, weaken the liquid column drift phenomenon caused by the dripping of liquid refrigerant caused by the blowing of gaseous refrigerant, and enhance the liquid refrigerant. The liquid distribution is uniform, and the dry spots formed on the outer wall of the heat exchange tube bundle 5 are reduced. At this time, 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 passes through the first through hole 24, the third channel 23, the fifth through hole 722, and the second channel 22 in sequence and enters the liquid collection space 81, and is then discharged from the third through hole 26 to form bubbles. The growth, rise and rupture of the bubbles will cause disturbances in the liquid refrigerant, and 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 will break when they contact the outer wall of the heat exchange tube bundle 5, and it is easy to form vaporization cores on the surface, increase the generation points of evaporation bubbles and promote 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 and enter the gas collecting space 61, and then be sucked away by the compressor, thereby completing the refrigerant cycle during the refrigeration working condition.

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

[0140] like Figure 8As shown, when the air-conditioning unit is in the heating condition, the compressor will discharge high-temperature and high-pressure gaseous refrigerant to the air collecting space 61. The gaseous refrigerant in the air collecting space 61 passes through the first channel 21 and the second through hole 25 in turn and is discharged to the outer wall of the heat exchange tube bundle 5 for condensation and heat exchange. The high-temperature and high-pressure gaseous refrigerant releases heat on the outer wall of the heat exchange tube bundle 5 and condenses into liquid refrigerant. The liquid refrigerant settles and gathers in the lower area of the heat exchange tube bundle 5. At this time, the liquid refrigerant will enter the liquid collecting space 81 through the third through hole 26. When the liquid collecting space When the liquid level of the liquid refrigerant in the room 81 is higher than the height of the liquid outlet of the drain pipe 82, the liquid refrigerant will be discharged to the outside and into a liquid storage device independently provided with the falling film heat pump heat exchanger. Then the liquid refrigerant in the liquid storage device passes through the throttle valve to reach the evaporator. This ensures that the area below the heat exchange tube bundle 5 immersed in the liquid refrigerant is reduced, increases the heat exchange area for condensation between the heat exchange tube bundle 5 and the high-temperature and high-pressure gaseous refrigerant, improves the heat exchange efficiency of the falling film heat pump heat exchanger, and completes the refrigerant circulation during heating conditions.

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

[0142] Obviously, the embodiments described above are only some embodiments of the present invention, rather than all embodiments. The preferred embodiments of the present invention are given in the accompanying drawings, but they do not limit the patent scope of the present invention. The present invention can be implemented in many different forms. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present invention more thorough and comprehensive. Although the present invention has been described in detail with reference to the aforementioned embodiments, for those skilled in the art, it is still possible to modify the technical solutions described in the aforementioned specific embodiments, or to make equivalent replacements for some of the technical features therein. Any equivalent structure made using the contents of the present invention specification and drawings, directly or indirectly used in other related technical fields, is also within the scope of patent protection of the present invention.

Claims

1. A falling film heat pump heat exchanger, characterized in that: include: An outer shell (1) and an inner cylinder (2) are coaxially nested, and a gas-liquid separation structure (3), a liquid distribution structure (4), and a heat exchange tube bundle (5) are sequentially arranged between the outer shell (1) and the inner cylinder (2) along the axial direction; A bidirectional gas path structure (6), a flow channel separation structure (7) and a liquid discharge structure (8) are sequentially provided coaxially within the inner cylinder (2); The flow channel separation structure (7) divides the corresponding inner cylinder (2) into a first channel (21) communicating with the bidirectional gas path structure (6) and a second channel (22) communicating with the liquid discharge structure (8); A third channel (23) communicating with the second channel (22) is formed between the bidirectional air path structure (6) and the corresponding inner cylinder (2); 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 drainage structure (8); The gas-liquid separation structure (3) is used to connect to a condenser, and the bidirectional gas path structure (6) is used to connect to a compressor.

2. The falling film heat pump heat exchanger according to claim 1, characterized in that: The flow channel separation structure (7) comprises: a partition plate (71), the partition plate (71) dividing the inner cylinder (2) between the bidirectional air path structure (6) and the liquid discharge 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 corresponding radial cross-section of the inner cylinder (2); a fourth through hole (721) for connecting the bidirectional gas path structure (6) and the first channel (21) is provided in a central area of the first baffle (72); and a fifth through hole (722) for connecting the second channel (22) and the third channel (23) is provided at an edge of the first baffle (72).

3. The falling film heat pump heat exchanger according to claim 2, characterized in that: The flow channel separation structure (7) further 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 corresponding radial cross-section of the 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 uniform structure (4) and connected to the second channel (22). The seventh through hole (27) is located below the first through hole (24). The seventh through hole (27) is used to transport the gaseous refrigerant on the liquid uniform structure (4) to the second channel (22).

5. The falling film heat pump heat exchanger according to claim 1, characterized in that: The liquid-homogenizing structure (4) comprises: A liquid balancing plate (41), the liquid balancing plate (41) extending radially and completely covering the radial cross section of the corresponding annular gap between the inner cylinder (2) and the outer shell (1); the liquid balancing plate (41) is provided with at least one row of liquid balancing through holes (411) along the circumferential direction, the liquid balancing through holes (411) being used to evenly drip liquid refrigerant onto the outer side wall of the heat exchange tube bundle (5) below; A guide plate (42) is located at the edge of the liquid balancing plate (41) and is circumferentially arranged toward the gas-liquid separation structure (3), and the guide plate (42) is in close contact with the inner wall of the corresponding outer shell (1). The guide plate (42) is used to converge the liquid refrigerant on the inner wall of the outer shell (1) onto the liquid balancing plate (41).

6. The falling film heat pump heat exchanger according to claim 1, characterized in that: The drainage structure (8) comprises: A liquid collecting space (81) is formed by the inner cylinder (2) below the flow channel separation structure (7), the liquid collecting space (81) is communicated with the second channel (22), and a third through hole (26) is provided on a side wall of an end of the liquid collecting space (81) away from the flow channel separation structure (7); A liquid discharge pipe (82) has one end axially arranged in the liquid collecting space (81), and the height of the liquid discharge pipe (82) in the liquid collecting space (81) is lower than the axial height of the liquid collecting space (81); the other end of the liquid discharge pipe (82) penetrates the bottom wall of the inner cylinder (2) and extends outward, and is used for connecting to 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) comprises a spiral baffle (31) arranged in an axial spiral manner, wherein the spiral baffle (31) extends in a radial direction and completely covers a radial cross section of the corresponding annular gap between the inner cylinder (2) and the outer cylinder (1); The outer shell (1) located above the spiral baffle (31) is connected to a first pipe (32), and the first pipe (32) 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 and arranged along the axial direction, corresponding to the spiral deflector (31).

9. The falling film heat pump heat exchanger according to claim 1, characterized in that: The bidirectional gas path structure (6) comprises: An air collecting space (61) formed by the inner cylinder (2) above the flow channel separation structure (7), wherein the air collecting space (61) is in communication with the first channel (21); a second pipe (62), one end of the second pipe (62) being in communication with the air collecting space (61), and the other end of the second pipe (62) being in communication with the compressor; An air baffle (63) is arranged at the top of the air collecting space (61), and the air baffle (63) extends radially and completely covers the radial cross-section of the third channel (23); the air baffle (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) is composed of an outer coil (51) and an inner coil (52), wherein the outer coil (51) is wrapped around the outer portion of the corresponding inner coil (52); Furthermore, the outer coil (51) and the inner coil (52) both 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 side 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 side wall of the outer shell (1) is also sealedly connected to a water inlet chamber (10) and a water outlet chamber (11); The water inlet chamber (10) is provided with a water inlet pipe (101), and the water inlet pipe (101) is used to communicate with the water outlet end on the user side; The water outlet chamber (11) is provided with a water outlet pipe (111); the water outlet pipe (111) is used to communicate with the water inlet end on the user side; Both ends of the heat exchange tube bundle (5) are provided with bidirectional flow joints (53) penetrating the outer shell (1), and a sealing structure is provided between the penetration point of the outer shell (1) and the corresponding bidirectional flow joints (53); The two-way flow joints (53) at the first end of the heat exchange tube bundle (5) are all connected to the water inlet chamber (10), and the two-way flow joints (53) at the second end of the heat exchange tube bundle (5) are all connected to the water outlet chamber (11).

13. An air conditioning unit, characterized in that: The air-conditioning unit comprises the falling film heat pump heat exchanger according to any one of claims 1 to 12.

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