Liquid distribution structure, heat exchange device and air conditioner

Abstract

The utility model provides a kind of liquid distribution structure, heat exchange device and air conditioner.The liquid distribution structure includes outer cylinder;Inner cylinder;Baffle assembly;The inner cylinder is provided with back gas hole, and the back gas cavity is communicated with the inner cylinder by the back gas hole.The utility model provides a kind of liquid distribution structure, heat exchange device and air conditioner, utilize baffle assembly to form falling film cavity and back gas cavity in installation cavity, gas refrigerant generated in falling film cavity is discharged to the inner cylinder in time, so that it avoids that gas refrigerant formed after heat exchange continues to flow with unheated refrigerant, guarantees the film formation state of liquid refrigerant on the surface of heat exchange pipe, guarantees evaporation efficiency and processing capacity, and because back gas cavity is above falling film cavity, when small droplet enters back gas cavity with gas refrigerant and condenses into larger droplet, liquid drop in back gas cavity can also reflow to falling film cavity for heat exchange, contact coil in falling film cavity again to produce film-pulling heat exchange effect, further improve heat exchange processing capacity.

Description

Technical Field

[0001] This utility model relates to the field of heat exchange technology, and in particular to a liquid distribution structure, a heat exchange device and an air conditioner. Background Technology

[0002] Small water-cooled refrigeration units often employ spiral tube falling film evaporators due to their compact structure and cost constraints. Conventional tank-type falling film evaporators require the incoming liquid refrigerant to be evenly distributed and sprayed vertically downwards onto the surface of the spiral heat exchange tubes. Under gravity, the liquid forms a uniform film that flows downwards. Therefore, the key factor affecting its heat exchange performance is the formation of the liquid film on the heat exchange tube surface. Furthermore, if the simultaneously evaporating gaseous refrigerant is not discharged in time, it will interfere with the film formation of the liquid refrigerant on the heat exchange tube surface, reducing evaporation efficiency and throughput, directly impacting the overall performance of the heat exchanger. Moreover, to ensure the separation of gaseous refrigerant, existing distributors require additional gas-liquid separation devices, resulting in a large required distribution space and a less compact structure. Therefore, improving the uniformity and stability of liquid distribution in tank-type falling film evaporators has become an urgent problem to be solved. Utility Model Content

[0003] To address the technical problem in existing tank-type falling film evaporators where the gaseous refrigerant cannot be discharged in a timely manner, thus affecting heat exchange efficiency, a liquid distribution structure, heat exchange device, and air conditioner are provided that utilize baffle assemblies to form a return gas chamber for rapid return of gas from the falling film chamber, thereby improving the separation effect of gaseous refrigerant.

[0004] A liquid distribution structure, comprising:

[0005] outer cylinder;

[0006] An inner cylinder is disposed inside the outer cylinder, and an installation cavity is formed between the inner cylinder and the outer cylinder. The lower end of the installation cavity and the lower end of the inner cylinder are both connected to the interior of the outer cylinder.

[0007] A baffle assembly is disposed within the mounting cavity, and the baffle assembly divides the mounting cavity into an inlet cavity, a return cavity, and a falling film cavity. The inlet cavity and the return cavity are both located above the falling film cavity, and the inlet cavity and the return cavity are both connected to the falling film cavity. The inlet cavity and the return cavity are relatively sealed.

[0008] The inner cylinder is provided with a return air hole, and the return air chamber is connected to the interior of the inner cylinder through the return air hole.

[0009] The baffle assembly includes a liquid equalization plate and a first liquid baffle plate, both of which are disposed within the mounting cavity. The liquid equalization plate, the first liquid baffle plate, and the corresponding inner wall of the outer cylinder together form the inlet cavity, and the first liquid baffle plate, the outer wall of the inner cylinder, and the corresponding inner wall of the outer cylinder together form the return air cavity.

[0010] The first baffle plate is inclined relative to the vertical plane, and the distance between the first baffle plate and the side wall of the outer cylinder gradually decreases along the direction from the bottom surface of the outer cylinder to the top surface of the outer cylinder.

[0011] The first baffle plate has a first included angle α with the vertical plane, and the angle α ranges from 30° to 60°.

[0012] The liquid distribution structure also includes a second liquid baffle plate, the inner cylinder is disposed on the outer cylinder through the second liquid baffle plate, and the second liquid baffle plate is provided with the air return hole.

[0013] The second baffle is inclined relative to the vertical plane, and the distance between the second baffle and the side wall of the outer cylinder gradually increases along the direction from the bottom surface of the outer cylinder to the top surface of the outer cylinder.

[0014] The second baffle plate has a second included angle β with the vertical plane, and the angle range of the second included angle β is 30° to 60°.

[0015] The liquid distribution structure also includes a liquid distribution pipe, which is disposed in the falling film cavity and the upper end of the liquid distribution pipe is connected to the inlet cavity. Liquid distribution holes are provided on the side wall of the liquid distribution pipe.

[0016] There is a first distance between the liquid distribution pipe and the inner wall of the outer cylinder, and a second distance between the liquid distribution pipe and the outer wall of the inner cylinder, with at least one liquid distribution hole facing the first distance; and / or, at least one liquid distribution hole facing the second distance.

[0017] A first coil is provided within the first spacing, and the liquid outlet direction of at least one of the liquid distribution holes points towards the first coil; and / or, a second coil is provided within the second spacing, and the liquid outlet direction of at least one of the liquid distribution holes points towards the second coil.

[0018] A first coil is provided within the first spacing, and the distance L1 between the first coil and the inner wall of the outer cylinder ranges from 1 mm to 3 mm; and / or, a second coil is provided within the second spacing, and the distance L2 between the second coil and the outer wall of the inner cylinder ranges from 1 mm to 3 mm.

[0019] The number of liquid distribution holes is multiple, and all the liquid distribution holes are distributed in a ring on the side wall of the liquid distribution pipe with the central axis of the liquid distribution pipe as the axis.

[0020] Along the height direction of the liquid distribution pipe, a plurality of annular liquid distribution areas are formed on the liquid distribution pipe, and at least one liquid distribution hole is provided in each annular liquid distribution area.

[0021] There are multiple liquid distribution pipes, and all of the liquid distribution pipes are arranged in a ring around the central axis of the outer cylinder.

[0022] The distance between the lower end of the inner cylinder and the bottom surface of the outer cylinder is less than the distance between the lower end of the liquid distribution pipe and the bottom surface of the outer cylinder.

[0023] The liquid distribution structure also includes an air outlet pipe, the outlet of which is connected to the outside of the outer cylinder, the inlet of which is connected to the inner cylinder, and the inlet of which is lower than the return air hole.

[0024] The lower end of the vent pipe is closed, and the inlet is provided on the lower side wall of the vent pipe.

[0025] A filter structure is provided between the inlet of the air outlet pipe and the lower end of the inner cylinder.

[0026] The outer cylinder, the inner cylinder, and the air outlet pipe are arranged coaxially.

[0027] A full liquid area for arranging a third coil is formed between the lower end of the inner cylinder and the bottom surface of the outer cylinder, and a fourth gap is formed between the lower end of the inner cylinder and the liquid surface of the full liquid area.

[0028] A heat exchange device includes the liquid distribution structure described above.

[0029] An air conditioner includes the liquid distribution structure or the heat exchange device described above.

[0030] The liquid distribution structure, heat exchange device, and air conditioner provided by this utility model utilize a baffle assembly to form a falling film chamber and a return gas chamber within the installation cavity. This allows the gaseous refrigerant generated in the falling film chamber to be promptly discharged into the inner cylinder, thus preventing the gaseous refrigerant formed after heat exchange from continuing to flow with the unexchanged refrigerant. This ensures the film formation of the liquid refrigerant on the surface of the heat exchange tubes, guaranteeing evaporation efficiency and throughput. Furthermore, since the return gas chamber is located above the falling film chamber, when small droplets enter the return gas chamber with the gaseous refrigerant and condense into larger droplets, the droplets in the return gas chamber can also flow back into the falling film chamber for heat exchange. They then come into contact with the coils in the falling film chamber again, generating a film-pulling heat exchange effect, further improving the heat exchange throughput. Attached Figure Description

[0031] Figure 1A cross-sectional view of the liquid distribution structure provided in an embodiment of this utility model;

[0032] Figure 2 for Figure 1 A partial schematic diagram of point A;

[0033] Figure 3 A schematic diagram of the fluid distribution structure provided in this embodiment of the utility model;

[0034] Figure 4 for Figure 3 A partial schematic diagram of point B;

[0035] Figure 5 Another cross-sectional view of the liquid distribution structure provided in this embodiment of the utility model;

[0036] Figure 6 Another cross-sectional view of the liquid distribution structure provided in this embodiment of the utility model;

[0037] Figure 7 This is a schematic diagram of the structure of the liquid distribution plate, the first liquid baffle, and the liquid distribution pipe provided in an embodiment of the present utility model;

[0038] Figure 8 This is a schematic diagram of the structure of the inner cylinder and the second baffle provided in an embodiment of the present utility model;

[0039] Figure 9 This is a schematic diagram of the structure of the air outlet pipe provided in an embodiment of the present utility model;

[0040] In the picture:

[0041] 1. Outer cylinder; 2. Inner cylinder; 11. Inlet chamber; 12. Return gas chamber; 13. Falling film chamber; 21. Return gas hole; 31. Liquid distribution plate; 32. First liquid baffle plate; 33. Second liquid baffle plate; 4. Liquid distribution pipe; 41. Liquid distribution hole; 51. First coil; 52. Second coil; 6. Gas outlet pipe; 61. Inlet; 7. Filter structure; 53. Third coil; 14. Full liquid zone. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages 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 only for explaining this utility model and are not intended to limit this utility model.

[0043] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0044] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such terms can be used interchangeably where appropriate for the embodiments of the utility model described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0045] It should be noted that in the description of this utility model, the terms "upper," "lower," "left," "right," "inner," and "outer," which indicate directional or positional relationships, are based on the directional or positional relationships shown in the accompanying drawings. These are merely for ease of description and do not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0046] Furthermore, it should be noted that, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "setting," and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection, an indirect connection through an intermediate medium, or a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0047] Small water-cooled refrigeration units often employ spiral tube falling film evaporators due to their compact structure and cost constraints. Conventional tank-type falling film evaporators require the incoming liquid refrigerant to be evenly distributed and sprayed vertically downwards onto the surface of the spiral heat exchange tubes. Under gravity, the liquid forms a uniform film that flows downwards. Therefore, the key factor affecting its heat exchange performance is the formation of the liquid film on the heat exchange tube surface. Furthermore, if the simultaneously evaporating gaseous refrigerant is not discharged in time, it will interfere with the film formation of the liquid refrigerant on the heat exchange tube surface, reducing evaporation efficiency and throughput, directly impacting the overall performance of the heat exchanger. Moreover, to ensure the separation of gaseous refrigerant, existing distributors require additional gas-liquid separation devices, resulting in a large required distribution space and a less compact structure. Therefore, improving the uniformity and stability of liquid distribution in tank-type falling film evaporators has become an urgent problem to be solved.

[0048] Therefore, this application provides a method such as Figures 1 to 9 The liquid distribution structure shown includes: an outer cylinder 1; an inner cylinder 2, which is disposed inside the outer cylinder 1, and an installation cavity is formed between the inner cylinder 2 and the outer cylinder 1. The lower end of the installation cavity and the lower end of the inner cylinder 2 are both connected to the interior of the outer cylinder 1; a baffle assembly, which is disposed inside the installation cavity and divides the installation cavity into an inlet cavity 11, a return air cavity 12, and a falling film cavity 13. The inlet cavity 11 and the return air cavity 12 are both located above the falling film cavity 13, and both the inlet cavity 11 and the return air cavity 12 are connected to the falling film cavity 13. The inlet cavity 11 and the return air cavity 12 are relatively sealed; the inner cylinder 2 is provided with a return air hole 21, and the return air cavity 12 is connected to the interior of the inner cylinder 2 through the return air hole 21.

[0049] By utilizing a baffle assembly to form a falling film chamber 13 and a return gas chamber 12 within the installation cavity, the gaseous refrigerant generated in the falling film chamber 13 is promptly discharged into the inner cylinder 2. This prevents the gaseous refrigerant formed after heat exchange from continuing to flow with the unexchanged refrigerant, ensuring the film formation of the liquid refrigerant on the surface of the heat exchange tubes, thus guaranteeing evaporation efficiency and throughput. Furthermore, since the return gas chamber 12 is located above the falling film chamber 13, when small droplets enter the return gas chamber 12 with the gaseous refrigerant and condense into larger droplets, the droplets in the return gas chamber 12 can also flow back into the falling film chamber 13 for heat exchange, and re-contact with the coils in the falling film chamber 13 to generate a film-pulling heat exchange effect, further improving the heat exchange throughput.

[0050] When using a liquid distribution structure, a heat exchange coil can be installed in the falling film cavity 13. Liquid refrigerant flows into the falling film cavity 13 from the inlet cavity 11 and flows over the outer wall of the heat exchange coil. As refrigerant is introduced into the heat exchange coil, it heats the liquid refrigerant. At this time, gaseous refrigerant begins to be generated in the falling film cavity 13. Under the action of gravity, the liquid refrigerant continues to flow downward, while the gaseous refrigerant floats upward. Since the inlet cavity 11 is filled with liquid refrigerant, the gaseous refrigerant can only flow into the return gas cavity 12, thereby achieving the purpose of timely discharge of gaseous refrigerant. This overcomes the problem in the prior art that the gaseous refrigerant can only continue to flow downward with the liquid refrigerant, which affects the heat exchange efficiency of the liquid refrigerant, and effectively improves the heat exchange efficiency and heat exchange capacity.

[0051] The inlet cavity 11 is equipped with a liquid inlet, and the liquid inlet direction is parallel to the tangential direction of the position of the liquid inlet in the inlet cavity 11. This allows the liquid refrigerant entering the inlet cavity 11 to undergo centrifugal spiral injection, enabling the inlet cavity 11 to be quickly filled with liquid refrigerant. This improves the working efficiency of the liquid distribution structure.

[0052] In one embodiment, the baffle assembly includes a liquid distribution plate 31 and a first liquid baffle plate 32. Both the liquid distribution plate 31 and the first liquid baffle plate 32 are disposed within the mounting cavity. The liquid distribution plate 31, the first liquid baffle plate 32, and the corresponding inner wall of the outer cylinder 1 together form the inlet cavity 11. The first liquid baffle plate 32, the outer wall of the inner cylinder 2, and the corresponding inner wall of the outer cylinder 1 together form the return gas cavity 12. By utilizing the liquid distribution plate 31 and the first liquid baffle plate 32 to respectively form different sidewalls of the inlet cavity 11, the sealing effect of the inlet cavity 11 relative to the return gas cavity 12 is ensured. The liquid refrigerant in the inlet cavity 11 can only enter the falling film cavity 13 for heat exchange, ensuring the reliability of the liquid distribution structure.

[0053] like Figure 1 As shown in the figure, the liquid distribution plate 31 is arranged horizontally, and the outer edge of the liquid distribution plate 31 is sealed to the inner wall of the outer cylinder 1. The first baffle plate 32 is arranged at the inner edge of the liquid distribution plate 31. The liquid refrigerant entering the inlet cavity 11 will flow on the liquid distribution plate 31, and then continue to flow downward under the action of gravity and enter the falling film cavity 13, ensuring the heat exchange effect of the liquid refrigerant. The first baffle plate 32 separates the inlet cavity 11 and the return gas cavity 12, ensuring the sealing effect of the inlet cavity 11 and the return gas cavity 12. The liquid refrigerant in the inlet cavity 11 cannot enter the return gas cavity 12, ensuring the reliability of the heat exchange structure.

[0054] The first baffle plate 32 is inclined relative to the vertical plane, and the distance between the first baffle plate 32 and the side wall of the outer cylinder 1 gradually decreases along the direction from the bottom surface of the outer cylinder 1 to the top surface of the outer cylinder 1. By inclining the first baffle plate 32, the space of the return gas chamber 12 gradually expands from bottom to top, allowing the gaseous refrigerant in the return gas chamber 12 to pass through quickly. This also reduces the pressure of the gaseous refrigerant in the return gas chamber 12, causing the small droplets entrained in the gaseous refrigerant to further separate. The small droplets will also converge to form large droplets that flow downwards and re-enter the falling film chamber 13 for heat exchange, thereby increasing the throughput of liquid refrigerant and avoiding the problem of liquid carryover in the return gas.

[0055] Preferably, the first baffle plate 32 has a first included angle α with the vertical plane, and the angle α ranges from 30° to 60°. Since the side of the first baffle plate 32 facing the inlet cavity 11 needs to guide the liquid refrigerant, the tilt angle of the first baffle plate 32 cannot be too small, that is, the first included angle α cannot be too small. If it is too small, the space of the inlet cavity 11 will be too small, affecting the flow rate of the liquid refrigerant. If the first included angle α is too large, the space change rate of the return gas cavity 12 will be low, affecting the discharge of the gaseous refrigerant. Only when the first included angle α is between 30° and 60° can the space of the inlet cavity 11 and the space of the return gas cavity 12 be reasonably guaranteed, ensuring the liquid distribution effect of the liquid distribution structure.

[0056] Furthermore, the liquid distribution structure also includes a second baffle plate 33. The inner cylinder 2 is mounted on the outer cylinder 1 via the second baffle plate 33, and the second baffle plate 33 is provided with the return air hole 21. That is, there is a certain distance between the upper end of the inner cylinder 2 and the top of the outer cylinder 1, and the inner cylinder 2 is set inside the outer cylinder 1 via the second baffle plate 33. The inner cylinder 2 can be directly set as a columnar structure, reducing the processing difficulty of the inner cylinder 2. The upper end of the inner cylinder 2 is in an open state, and the gaseous refrigerant in the return air chamber 12 can flow through the return air hole 21 on the second baffle plate 33 to the upper end of the inner cylinder 2 and finally enter the inner cylinder 2. At the same time, the second baffle plate 33 can also perform gas-liquid separation on the gaseous refrigerant flowing into the inner cylinder 2, further avoiding the problem of liquid carrying back in the return air.

[0057] The second baffle plate 33 is inclined relative to the vertical plane, and the distance between the first baffle plate 32 and the side wall of the outer cylinder 1 gradually increases along the direction from the bottom surface of the outer cylinder 1 to the top surface of the outer cylinder 1. By inclining the second baffle plate 33, the space of the return gas chamber 12 gradually expands from bottom to top, allowing the gaseous refrigerant in the return gas chamber 12 to pass through quickly. This also reduces the pressure of the gaseous refrigerant in the return gas chamber 12, further separating the small droplets entrained in the gaseous refrigerant. The small droplets also collect to form large droplets that flow downwards and re-enter the falling film chamber 13 for heat exchange, thereby increasing the throughput of liquid refrigerant and avoiding the problem of liquid carryover in the return gas. Moreover, some gaseous refrigerant will undergo gas-liquid separation through collision with the second baffle plate 33. The liquid refrigerant at the separation point can flow downwards along the inclined second baffle plate 33, facilitating the collection of small droplets and thus increasing the throughput of liquid refrigerant.

[0058] Preferably, the second baffle plate 33 has a second included angle β with the vertical plane, and the angle β ranges from 30° to 60°. Since the side of the second baffle plate 33 facing the return gas cavity 12 needs to guide the liquid refrigerant, the tilt angle of the second baffle plate 33 cannot be too small, that is, the second included angle β cannot be too small. If it is too small, the guiding effect of the second baffle plate 33 on the liquid refrigerant separated in the return gas cavity 12 will be poor. If the second included angle β is too large, the spatial change rate of the return gas cavity 12 will be low, which will affect the discharge of the gaseous refrigerant in the return gas cavity 12. Only when the second included angle β is between 30° and 60° can the reasonable space of the return gas cavity 12 and the guiding effect on the liquid refrigerant separated in the return gas cavity 12 be guaranteed, thus ensuring the liquid distribution effect of the liquid distribution structure.

[0059] To further improve the heat exchange effect of liquid refrigerant, the liquid distribution structure also includes a liquid distribution pipe 4, which is disposed within the falling film chamber 13, and its upper end is connected to the inlet chamber 11. The side wall of the liquid distribution pipe 4 is provided with liquid distribution holes 41. The liquid refrigerant in the inlet chamber 11 is guided to the falling film chamber 13 through the liquid distribution pipe 4, and sprayed horizontally through the liquid distribution holes 41 on the side wall of the liquid distribution pipe 4, thereby improving the uniformity and stability of liquid distribution in the falling film zone, and thus enhancing the film-forming effect and evaporation efficiency.

[0060] There is a first gap between the liquid distribution pipe 4 and the inner wall of the outer cylinder 1, and a second gap between the liquid distribution pipe 4 and the outer wall of the inner cylinder 2. At least one liquid distribution hole 41 faces the first gap, and at least one liquid distribution hole 41 faces the second gap. By setting the first gap and the second gap, space is provided for the arrangement of the coils. At the same time, the liquid distribution holes 41 are set with different orientations to ensure that the coils within the first gap and the coils within the second gap can both receive liquid refrigerant, thereby ensuring the heat exchange efficiency of the coils.

[0061] Specifically, a first coil 51 is provided within the first spacing, and the liquid outlet direction of at least one of the liquid distribution holes 41 is directed towards the first coil 51. The liquid refrigerant sprayed from the liquid distribution holes 41 can be sprayed onto the first coil 51 to ensure the flow rate of the liquid refrigerant on the first coil 51. At the same time, it can also make the refrigerant evenly cover the surface of the heat exchange tube and flow from top to bottom in a uniform film under the action of gravity, thereby improving the film-forming effect.

[0062] Furthermore, a first coil 51 is provided within the first gap. The distance L1 between the first coil 51 and the inner wall of the outer cylinder 1 ranges from 1mm to 3mm. The distance L1 allows for better formation of a liquid film distribution channel, ensuring that the liquid refrigerant adhering to the inner wall of the outer cylinder 1 always flows downwards in a film-like manner along the cylinder wall surface, thus improving the liquid refrigerant film distribution efficiency. When the distance L1 is too small, the liquid refrigerant cannot flow through the distance L1 and cannot form a liquid film. When the distance L1 is too large, the liquid refrigerant adhering to the inner wall of the outer cylinder 1 cannot contact the first coil 51, which reduces the heat exchange efficiency of the liquid refrigerant. Only when the distance L1 is between 1mm and 3mm can the film-pulling effect be optimal, thereby ensuring the heat exchange efficiency of the heat exchange device where the liquid distribution structure is located.

[0063] Similarly, a second coil 52 is provided within the second spacing, and the liquid outlet direction of at least one of the liquid distribution holes 41 points towards the second coil 52. The liquid refrigerant sprayed from the liquid distribution holes 41 can be sprayed onto the second coil 52, ensuring the flow rate of liquid refrigerant on the second coil 52, and also enabling the refrigerant to uniformly cover the surface of the heat exchange tube, forming a uniform film that flows from top to bottom under the action of gravity, thereby improving the film-forming effect.

[0064] Furthermore, a second coil 52 is provided within the second gap, and the distance L2 between the second coil 52 and the outer wall of the inner cylinder 2 ranges from 1mm to 3mm. The distance L2 allows for better formation of a liquid film distribution channel, ensuring that the liquid refrigerant adhering to the outer wall of the inner cylinder 2 always flows downwards in a film-like manner along the cylinder wall surface, thus improving the liquid refrigerant film distribution efficiency. When the distance L2 is too small, the liquid refrigerant cannot flow through the distance L2 and cannot form a liquid film; when the distance L2 is too large, the liquid refrigerant adhering to the outer wall of the inner cylinder 2 cannot contact the second coil 52, reducing the heat exchange efficiency of the liquid refrigerant. Only when the distance L2 is between 1mm and 3mm can the film-forming effect be optimal, thereby ensuring the heat exchange efficiency of the heat exchange device containing the liquid distribution structure.

[0065] The number of liquid distribution holes 41 is multiple, and all the liquid distribution holes 41 are distributed in a ring on the side wall of the liquid distribution pipe 4 with the central axis as the axis. That is, the spraying direction of the liquid distribution holes 41 is at different angles in the horizontal direction, thereby ensuring the uniform distribution of liquid refrigerant, improving the uniformity and stability of liquid distribution in the falling film zone, and thus improving the film pulling effect and evaporation efficiency.

[0066] Along the height direction of the liquid distribution pipe 4, multiple annular liquid distribution areas are formed on the liquid distribution pipe 4, and at least one liquid distribution hole 41 is provided in each annular liquid distribution area. By utilizing multiple annular liquid distribution areas, liquid refrigerant is supplied to the heat exchange parts of the coil at different heights, ensuring the heat exchange efficiency of the coil.

[0067] The number of liquid distribution pipes 4 is multiple, and all the liquid distribution pipes 4 are arranged in a ring around the central axis of the outer cylinder 1. The outer cylinder 1 and the inner cylinder 2 are coaxially arranged to form a ring-shaped falling film cavity 13. At this time, the liquid distribution pipes 4 can be distributed in a ring-shaped manner within the ring-shaped falling film cavity 13, ensuring that each area within the falling film cavity 13 can receive liquid refrigerant. It can also adapt to the spiral shape of the coil, thereby ensuring that liquid refrigerant is supplied to each area of ​​the coil and ensuring heat exchange efficiency.

[0068] The distance between the lower end of the inner cylinder 2 and the bottom surface of the outer cylinder 1 is less than the distance between the lower end of the liquid distribution pipe 4 and the bottom surface of the outer cylinder 1. This means that even if the lower end of the inner cylinder 2 is lower than the lowest point of the falling film chamber 13, the liquid refrigerant in the falling film chamber 13 cannot enter the inner cylinder 2, while the gaseous refrigerant in the falling film chamber 13 needs to be diverted and deflected before entering the inner cylinder 2. This increases the gas-liquid separation effect, reduces the amount of liquid refrigerant entering the inner cylinder 2 from its lower end, and avoids the problem of liquid carryover.

[0069] Preferably, the height difference between the lower end of the inner cylinder 2 and the lower end of the falling film cavity 13 needs to be greater than 10mm to ensure that the gaseous refrigerant and liquid refrigerant can flow according to the set flow path and ensure the reliability of the liquid distribution structure.

[0070] Furthermore, the liquid distribution structure also includes a gas outlet pipe 6. The outlet of the gas outlet pipe 6 is connected to the outside of the outer cylinder 1, and the inlet 61 of the gas outlet pipe 6 is connected to the inner cylinder 2. The inlet 61 of the gas outlet pipe 6 is lower than the return gas hole 21. The gaseous refrigerant entering the inner cylinder is discharged through the gas outlet pipe 6. Because the inlet 61 of the gas outlet pipe 6 is lower than the return gas hole 21, the gaseous refrigerant entering the inner cylinder 2 through the return gas hole 21 on the second baffle plate 33 still needs to be diverted and deflected before it can enter the gas outlet pipe 6, further increasing the gas-liquid separation effect and avoiding the problem of liquid being drawn in.

[0071] Since gaseous refrigerant flows into the lower end of the inner cylinder 2, and the lower end of the outlet pipe 6 points towards the lower end of the inner cylinder 2, the lower end of the outlet pipe 6 is closed, and the inlet 61 is provided on the lower side wall of the outlet pipe 6. At this time, the outlet pipe 6 can only enter gas from its lower side wall. The gaseous refrigerant entering from the upper end of the inner cylinder 2 and the gaseous refrigerant entering from the lower end of the inner cylinder 2 need to be turned to enter the outlet pipe 6, which further increases the gas-liquid separation effect and ensures the purity of the gaseous refrigerant discharged from the outlet pipe 6.

[0072] The lower end of the outlet pipe 6 is located in the middle of the inner cylinder 2, so that the distance from the upper end and the lower end of the inner cylinder 2 to the inlet 61 of the outlet is basically the same, ensuring that the gaseous refrigerant entering from the upper end of the inner cylinder 2 and the gaseous refrigerant entering from the lower end of the inner cylinder 2 are reliably separated into gas and liquid, further avoiding the problem of liquid being carried in by air intake.

[0073] Because the flow rate of gaseous refrigerant entering the lower end of the inner cylinder 2 is relatively large, and an additional coil can be installed in the outer cylinder 1 below the inner cylinder 2 for heating, the flow rate of gaseous refrigerant at the lower end of the inner cylinder 2 will be further increased. Therefore, a filter structure 7 is provided between the inlet 61 of the outlet pipe 6 and the lower end of the inner cylinder 2. The gaseous refrigerant is filtered by the filter structure 7 and gas-liquid separation is performed again to ensure the purity of the gaseous refrigerant discharged from the outlet pipe 6 and further avoid the problem of liquid being drawn in.

[0074] The outer cylinder 1, the inner cylinder 2, and the outlet pipe 6 are coaxially arranged. The coaxial arrangement of the outer cylinder 1 and the inner cylinder 2 makes the space of the falling film cavity 13 formed between the outer cylinder 1 and the inner cylinder 2 a uniform annular cavity, which facilitates the installation of the coil and ensures uniform heat exchange in the falling film cavity 13, thereby improving the heat exchange efficiency of the heat exchange device where the liquid distribution structure is located. At the same time, the coaxial arrangement of the inner cylinder 2 and the outlet pipe 6 ensures that the path from the return gas cavity 12 to the outlet pipe 6 is basically consistent, thus ensuring the purity of the gaseous refrigerant discharged from the outlet pipe 6.

[0075] A full liquid zone 14 is formed between the lower end of the inner cylinder 2 and the bottom surface of the outer cylinder 1 for installing the third coil 53. A fourth distance exists between the lower end of the inner cylinder 2 and the liquid surface of the full liquid zone 14. Liquid refrigerant that has not undergone heat exchange in the falling film chamber 13 continues to flow downwards and collects in the full liquid zone 14. At this time, the third coil 53 is installed in the full liquid zone 14 to continue heating the liquid refrigerant, increasing the amount of gaseous refrigerant generated and ensuring the heat exchange efficiency of the heat exchange device. Simultaneously, the fourth distance allows both the gaseous refrigerant in the falling film chamber 13 and the gaseous refrigerant generated in the full liquid zone 14 to smoothly enter the inner cylinder 2, ensuring the smooth discharge of the gaseous refrigerant.

[0076] At this time, the filter structure 7 set at the outlet pipe 6 can better prevent the gaseous refrigerant generated in the falling film zone and the full liquid zone 14 from generating vortex airflow at the bottom of the outlet pipe 6, especially for the precise separation of the gas and liquid two-phase refrigerant from the full liquid zone 14; and the separated liquid refrigerant drips down the inner wall of the inner cylinder 2 into the full liquid zone 14 by gravity, thereby improving the heat exchange performance and gas-liquid separation efficiency.

[0077] A heat exchange device includes the liquid distribution structure described above.

[0078] The heat exchange device includes a first coil 51, a second coil 52 and a third coil 53. The first coil 51 is arranged within a first spacing, the second coil 52 is arranged within a second spacing, and the third coil 53 is arranged within the full liquid zone 14.

[0079] An air conditioner includes the liquid distribution structure or the heat exchange device described above.

[0080] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A liquid distribution structure, characterized in that: include: outer cylinder(1); Inner cylinder (2), the inner cylinder (2) is disposed inside the outer cylinder (1), and an installation cavity is formed between the inner cylinder (2) and the outer cylinder (1). The lower end of the installation cavity and the lower end of the inner cylinder (2) are both connected to the interior of the outer cylinder (1). A baffle assembly is disposed within the mounting cavity, and the baffle assembly divides the mounting cavity into an inlet cavity (11), a return cavity (12), and a falling film cavity (13). The inlet cavity (11) and the return cavity (12) are both located above the falling film cavity (13), and the inlet cavity (11) and the return cavity (12) are both connected to the falling film cavity (13). The inlet cavity (11) and the return cavity (12) are relatively sealed. The inner cylinder (2) is provided with a return air hole (21), and the return air chamber (12) is connected to the interior of the inner cylinder (2) through the return air hole (21).

2. The liquid distribution structure according to claim 1, characterized in that: The baffle assembly includes a liquid equalization plate (31) and a first liquid baffle plate (32). The liquid equalization plate (31) and the first liquid baffle plate (32) are both disposed in the mounting cavity. The liquid equalization plate (31), the first liquid baffle plate (32) and the inner wall of the corresponding outer cylinder (1) together form the inlet cavity (11). The first liquid baffle plate (32), the outer wall of the inner cylinder (2) and the inner wall of the corresponding outer cylinder (1) together form the return air cavity (12).

3. The liquid distribution structure according to claim 2, characterized in that: The first baffle plate (32) is inclined relative to the vertical plane, and the distance between the first baffle plate (32) and the side wall of the outer cylinder (1) gradually decreases along the direction from the bottom surface of the outer cylinder (1) to the top surface of the outer cylinder (1).

4. The liquid distribution structure according to claim 3, characterized in that: The first baffle (32) has a first included angle α with the vertical plane, and the angle α ranges from 30° to 60°.

5. The liquid distribution structure according to claim 1, characterized in that: The liquid distribution structure also includes a second baffle plate (33), the inner cylinder (2) is disposed on the outer cylinder (1) through the second baffle plate (33), and the second baffle plate (33) is provided with the return air hole (21).

6. The liquid distribution structure according to claim 5, characterized in that: The second baffle plate (33) is inclined relative to the vertical plane, and the distance between the second baffle plate (33) and the side wall of the outer cylinder (1) gradually increases along the direction from the bottom surface of the outer cylinder (1) to the top surface of the outer cylinder (1).

7. The liquid distribution structure according to claim 6, characterized in that: The second baffle (33) has a second included angle β with the vertical plane, and the angle range of the second included angle β is 30° to 60°.

8. The liquid distribution structure according to claim 1, characterized in that: The liquid distribution structure also includes a liquid distribution pipe (4), which is disposed in the falling film chamber (13) and the upper end of the liquid distribution pipe (4) is connected to the inlet chamber (11). A liquid distribution hole (41) is provided on the side wall of the liquid distribution pipe (4).

9. The liquid distribution structure according to claim 8, characterized in that: There is a first distance between the liquid distribution pipe (4) and the inner wall of the outer cylinder (1), and a second distance between the liquid distribution pipe (4) and the outer wall of the inner cylinder (2). At least one of the liquid distribution holes (41) faces the first distance; and / or, at least one of the liquid distribution holes (41) faces the second distance.

10. The liquid distribution structure according to claim 9, characterized in that: A first coil (51) is provided within the first spacing, and the liquid outlet direction of at least one of the liquid distribution holes (41) points to the first coil (51); and / or, a second coil (52) is provided within the second spacing, and the liquid outlet direction of at least one of the liquid distribution holes (41) points to the second coil (52).

11. The liquid distribution structure according to claim 9, characterized in that: A first coil (51) is provided within the first spacing, and the distance L1 between the first coil (51) and the inner wall of the outer cylinder (1) ranges from 1 mm to 3 mm; and / or, a second coil (52) is provided within the second spacing, and the distance L2 between the second coil (52) and the outer wall of the inner cylinder (2) ranges from 1 mm to 3 mm.

12. The liquid distribution structure according to claim 8, characterized in that: The number of liquid distribution holes (41) is multiple, and all the liquid distribution holes (41) are distributed in a ring on the side wall of the liquid distribution pipe (4) with the central axis of the liquid distribution pipe (4) as the axis.

13. The liquid distribution structure according to claim 12, characterized in that: Along the height direction of the liquid distribution pipe (4), a plurality of annular liquid distribution areas are formed on the liquid distribution pipe (4), and at least one liquid distribution hole (41) is provided at each annular liquid distribution area.

14. The liquid distribution structure according to claim 8, characterized in that: There are multiple liquid distribution pipes (4), and all the liquid distribution pipes (4) are arranged in a ring around the central axis of the outer cylinder (1).

15. The liquid distribution structure according to claim 8, characterized in that: The distance between the lower end of the inner cylinder (2) and the bottom surface of the outer cylinder (1) is less than the distance between the lower end of the liquid distribution pipe (4) and the bottom surface of the outer cylinder (1).

16. The liquid distribution structure according to claim 1, characterized in that: The liquid distribution structure also includes an air outlet pipe (6), the outlet of which is connected to the outside of the outer cylinder (1), the inlet (61) of which is connected to the inner cylinder (2), and the inlet (61) of which is lower than the return air hole (21).

17. The liquid distribution structure according to claim 16, characterized in that: The lower end of the vent pipe (6) is closed, and the inlet (61) is provided on the lower side wall of the vent pipe (6).

18. The liquid distribution structure according to claim 16, characterized in that: A filter structure (7) is provided between the inlet (61) of the air outlet pipe (6) and the lower end of the inner cylinder (2).

19. The liquid distribution structure according to claim 16, characterized in that: The outer cylinder (1), the inner cylinder (2), and the air outlet pipe (6) are arranged coaxially.

20. The liquid distribution structure according to claim 1, characterized in that: A full liquid area (14) for setting the third coil (53) is formed between the lower end of the inner cylinder (2) and the bottom surface of the outer cylinder (1), and a fourth gap is formed between the lower end of the inner cylinder (2) and the liquid surface of the full liquid area (14).

21. A heat exchange device, characterized in that: The liquid distribution structure includes any one of claims 1 to 20.

22. An air conditioner, characterized in that: Includes the liquid distribution structure according to any one of claims 1 to 20 or the heat exchange device according to claim 21.

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