Heat exchanger liquid distribution structure, heat exchanger and air conditioning system

Abstract

This utility model provides a heat exchanger liquid distribution structure, a heat exchanger, and an air conditioning system. The heat exchanger liquid distribution structure includes an outer shell, an inner shell disposed inside the outer shell, forming an outer heat exchange cavity between the inner shell and the outer shell, and an inner heat exchange cavity formed inside the inner shell; a liquid inlet pipe disposed at the top of the inner shell and connecting the inner heat exchange cavity to the outside of the outer shell; a liquid equalization structure disposed on the upper layer of the inner heat exchange cavity for evenly distributing the liquid refrigerant introduced into the inner heat exchange cavity through the liquid inlet pipe downwards; a plurality of first heat exchange tubes disposed at intervals in the inner heat exchange cavity for primary heat exchange of the liquid refrigerant; a drain port disposed at the bottom end of the inner shell; a full liquid zone disposed at the bottom layer of the outer heat exchange cavity and below the drain port, formed by the accumulation of liquid refrigerant discharged from the drain port; a plurality of second heat exchange tubes disposed at intervals in the full liquid zone for secondary heat exchange of the liquid refrigerant; and a suction pipe disposed at the top of the outer shell for discharging the gaseous refrigerant generated from the primary and secondary heat exchange from the outer heat exchange cavity into the outer shell.

Description

Technical Field

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

[0002] Currently, the shell-and-tube evaporators available on the market mainly employ two heat exchange methods: flooded and falling film. The structure of a flooded shell-and-tube evaporator is as follows: Figure 1 As shown, the heat exchange tubes in its evaporator are all immersed in liquid refrigerant. When the liquid refrigerant and the heat exchange tubes exchange heat, the refrigerant absorbs heat and vaporizes, thus forming numerous bubbles, such as... Figure 2 As shown, due to the large volume of the evaporator shell and tubes, and the layered arrangement of heat exchange tubes within the shell and tube cavity, the bubbles generated by refrigerant vaporization during heat exchange in the upper layers of the shell and tube cavity are more likely to float to the refrigerant surface and dissipate within the shell and tube cavity. However, during heat exchange in the lower layers of the shell and tube cavity, the bubbles generated by refrigerant vaporization are less likely to float to the surface and dissipate due to the obstruction of the upper heat exchange tubes. This causes the bubbles to easily adhere to the heat exchange tube walls, hindering heat exchange and thus reducing the heat exchange effect and efficiency of the heat exchange tubes.

[0003] The structure of a falling film shell-and-tube evaporator is as follows: Figure 3 As shown, the heat exchange tubes in the evaporator are arranged in an orderly, layered manner below the liquid equalization structure within the shell and tube cavity. The refrigerant in the condenser of the air conditioning system is throttled by a throttling valve and then introduced into the evaporator. The liquid refrigerant is then dispersed downwards by the liquid equalization structure in the upper layer of the shell and tube cavity, dripping onto the surface of the heat exchange tubes like raindrops. This allows the raindrops of refrigerant to exchange heat with the heat exchange tubes, rapidly absorbing heat and vaporizing into refrigerant gas. Figure 4 As shown. This type of falling film shell-and-tube evaporator has a higher heat exchange efficiency than the flooded shell-and-tube evaporator in terms of heat exchange principle. However, due to the limitations of the uniform liquid distribution structure, it is difficult to ensure that the liquid refrigerant is completely and evenly distributed downwards. This results in uneven distribution of refrigerant received by the heat exchange tubes in the lower shell-and-tube cavity. Some areas of the heat exchange tubes receive more liquid refrigerant, while others receive less or no refrigerant, leading to poor overall heat exchange efficiency. Furthermore, because the heat exchange tubes are arranged in multiple layers from top to bottom in the shell-and-tube cavity, the top layers still produce a certain heat exchange effect due to greater contact with the refrigerant. However, the middle and lower layers of heat exchange tubes are blocked by the upper layers, resulting in increasingly less liquid refrigerant received. Some heat exchange tubes even dry-burn due to lack of liquid refrigerant lubrication, failing to achieve heat exchange effect and reducing their service life, further reducing the heat exchange effect and efficiency. Utility Model Content

[0004] This invention proposes a heat exchanger liquid distribution structure, a heat exchanger, and an air conditioning system to solve the technical problem of poor heat exchange efficiency in traditional flooded and falling film shell-and-tube evaporators.

[0005] To solve the above problems, the technical solution adopted by this utility model is as follows:

[0006] This utility model provides a heat exchanger liquid distribution structure, including an outer shell, and further comprising:

[0007] An inner shell is located inside the outer shell, forming an external heat exchange cavity between the inner shell and the outer shell, and forming an internal heat exchange cavity inside the inner shell.

[0008] The liquid inlet pipe is located at the top of the inner shell and connects the inner heat exchange chamber with the outside of the outer shell.

[0009] The liquid distribution structure is located in the upper layer of the inner heat exchange cavity and is used to evenly distribute the liquid refrigerant introduced into the inner heat exchange cavity through the liquid inlet pipe downwards.

[0010] Multiple first heat exchange tubes are spaced apart in the inner heat exchange cavity for primary heat exchange of liquid refrigerant;

[0011] The drain outlet is located at the bottom of the inner shell.

[0012] The liquid-filled zone is located at the bottom of the external heat exchange chamber and below the drain port, and is formed by the accumulation of liquid refrigerant discharged from the drain port.

[0013] Multiple second heat exchange tubes are intermittently immersed in the liquid refrigerant in the full liquid zone for secondary heat exchange of the liquid refrigerant;

[0014] The suction pipe, located at the top of the outer shell, is used to discharge the gaseous refrigerant generated by the primary and secondary heat exchange from the outer heat exchange chamber into the outer shell.

[0015] Furthermore, the heat exchanger liquid distribution structure also includes:

[0016] The jet pipe is located at the bottom of the liquid-filled area;

[0017] The gas pipeline connects the inner heat exchange chamber and the jet pipe, and is used to transport the gaseous refrigerant generated by the first heat exchange from the inner heat exchange chamber to the jet pipe, so that the jet pipe can spray the gaseous refrigerant into the liquid refrigerant in the liquid-filled area.

[0018] Furthermore, the heat exchanger liquid distribution structure also includes:

[0019] Multiple liquid storage trays are spaced apart in the inner heat exchange chamber in the height direction to receive liquid refrigerant distributed from above and overflow liquid refrigerant to the bottom;

[0020] Several first heat exchange tubes are immersed in liquid refrigerant stored in a liquid storage tray.

[0021] Preferably, the gas transmission pipeline includes:

[0022] The gas collecting pipe has one end connected to the part between the liquid equalization structure corresponding to the inner heat exchange cavity and the first heat exchange tube of the uppermost layer, and the other end of the gas collecting pipe passes through the top of the inner shell and extends to the outer heat exchange cavity.

[0023] The air guide tube connects the other end of the air collecting tube to the jet pipe.

[0024] Preferably, the homogenization structure includes:

[0025] The liquid distribution pipe is located on the top side of the inner heat exchange chamber and is connected to the liquid inlet pipe;

[0026] The liquid distributor, located below the distributor tube, is used to evenly distribute the liquid refrigerant collected in the distributor tube downwards.

[0027] Preferably, the inner shell comprises:

[0028] Side frame, located inside the outer shell;

[0029] The top cover is located inside the outer shell and is enclosedly connected to the top of the side frame;

[0030] The bottom sealing plate is located inside the outer shell and is sealed and connected to the bottom end of the side frame;

[0031] The liquid inlet pipe is installed on the top cover plate, and the liquid outlet is located on the bottom cover plate.

[0032] Preferably, the bottom sealing plate is a conical plate that gradually slopes downward from the periphery to the center, and the drain outlet is located at the tip of the cone at the center of the bottom sealing plate.

[0033] This utility model also provides a heat exchanger, including the above-described heat exchanger liquid distribution structure.

[0034] Preferably, the heat exchanger is an evaporator.

[0035] This utility model also provides an air conditioning system, including a compressor, a first heat exchanger connected to the exhaust port of the compressor and a throttle valve, and further including the aforementioned heat exchanger, which serves as a second heat exchanger of the air conditioning system, with an air intake pipe connected to the air intake port of the compressor and an inlet pipe connected to the first heat exchanger through the throttle valve.

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

[0037] The heat exchanger liquid distribution structure provided by this utility model combines the advantages of falling film shell-and-tube evaporators and flooded shell-and-tube evaporators. It alleviates the problem of poor primary heat exchange efficiency in the falling film zone caused by the limited liquid distribution performance of the liquid distribution structure in the upper part of the falling film zone, which leads to the downward dispersion of liquid refrigerant and uneven distribution of refrigerant received by each of the first heat exchange tubes. It can gather the excess liquid refrigerant overflowing from the falling film zone due to insufficient primary heat exchange to form the lower part of the flooded zone. The liquid refrigerant in the flooded zone is used to soak multiple second heat exchange tubes and exchange heat with them for a second time. The falling film zone and the flooded zone are connected by a gas pipeline and a jet pipe so that the vaporized gaseous refrigerant is input into the flooded zone and the liquid refrigerant churns, causing the bubbles to detach from the second heat exchange tubes and float to the surface of the flooded zone, where they burst and dissipate, thereby improving the heat exchange efficiency of the evaporator. Attached Figure Description

[0038] To more clearly illustrate the technical solution proposed by this utility model, the present utility model will be described in detail below with reference to the embodiments and accompanying drawings. It should be understood that the embodiments and accompanying drawings described in the following detailed description are merely some embodiments of this utility model, and those skilled in the art can make changes to these drawings under the concept of this utility model.

[0039] Figure 1 A schematic diagram of an air conditioning system using a traditional flooded shell-and-tube evaporator;

[0040] Figure 2 for Figure 1 A magnified schematic diagram of a portion of region A in the diagram;

[0041] Figure 3 A schematic diagram of an air conditioning system using a traditional falling film shell-and-tube evaporator;

[0042] Figure 4 for Figure 3 A magnified schematic diagram of the local structure of region B in the diagram;

[0043] Figure 5 A schematic diagram of an air conditioning system using the heat exchanger liquid distribution structure provided by this utility model;

[0044] Figure 6 A schematic diagram of the liquid distribution structure of the heat exchanger provided by this utility model;

[0045] Figure 7 for Figure 6 A magnified schematic diagram of the local structure of region C.

[0046] The main markings in the attached figures are as follows:

[0047] 1. Outer shell; 11. Suction pipe; 12. External heat exchange chamber;

[0048] 2. Inner shell; 21. Inner heat exchange chamber; 22. Liquid inlet pipe; 23. Side frame; 24. Top cover plate; 25. Bottom sealing plate; 251. Drain port;

[0049] 3. Equalization structure; 31. Distributor tube; 32. Equalizer;

[0050] 4. First heat exchange tube;

[0051] 5. Liquid storage tray; 51. First tray; 52. Second tray;

[0052] 6. Second heat exchange tube;

[0053] 7. Jet nozzle;

[0054] 8. Gas transmission pipeline; 81. Gas collection pipe; 82. Gas delivery pipe;

[0055] 9. Compressor; 91. Inlet; 92. Outlet;

[0056] 10. Second heat exchanger;

[0057] 20. First heat exchanger;

[0058] 30. Throttling valve;

[0059] 40. Refrigerant piping.

[0060] The other markings in the diagram are as follows:

[0061] D. Falling film zone;

[0062] E. Full liquid zone;

[0063] F. Liquid refrigerant;

[0064] G. Gaseous refrigerant;

[0065] H, air bubbles. Detailed Implementation

[0066] To make the technical problem to be solved, the technical solution and the beneficial effects of this utility model clearer, the following description is provided in conjunction with the appendix. Figure 5-7 The present invention will be further described in detail with reference to the embodiments.

[0067] Please refer to the following: Figure 5-7 The heat exchanger liquid distribution structure provided by this utility model includes an outer shell 1, and also includes:

[0068] The inner shell 2 is located inside the outer shell 1, and an outer heat exchange cavity 12 is formed between the inner shell 2 and the outer shell 1. The internal space of the inner shell 2 forms an inner heat exchange cavity 21. The liquid inlet pipe 22 is located at the top of the inner shell 2 and connects the inner heat exchange cavity 21 with the outside of the outer shell 1.

[0069] The liquid equalization structure 3 is located on the upper layer of the inner heat exchange cavity 21 and is used to evenly distribute the liquid refrigerant C (liquid refrigerant) introduced into the inner heat exchange cavity 21 from the outside of the outer shell 1 through the liquid inlet pipe 22 into the space of the inner heat exchange cavity 21 below; a plurality of first heat exchange tubes 4 are arranged at intervals in the inner heat exchange cavity 21 and are used to perform a single heat exchange on the liquid refrigerant C that is distributed into the space of the inner heat exchange cavity 21 through the liquid equalization structure 3; the drain port 251 is located at the bottom end of the inner shell 2 and connects the inner heat exchange cavity 21 and the outer heat exchange cavity 12, and each of the first heat exchange tubes 4 is located between the liquid equalization structure 3 and the drain port 251;

[0070] The full liquid zone B is located at the bottom of the outer heat exchange cavity 12 and below the drain port 251. The liquid refrigerant C, which is discharged from the upper drain port 251 and generated by the vaporization of liquid refrigerant C through heat exchange with the first heat exchange tube 4 in the inner heat exchange cavity 21, is accumulated at the bottom of the outer heat exchange cavity 12.

[0071] Multiple second heat exchange tubes 6 are intermittently immersed in the liquid refrigerant C in the full liquid zone B, for secondary heat exchange of the liquid refrigerant C in the full liquid zone B;

[0072] The suction pipe 11 is located at the top of the outer shell 1. It is used to discharge the gaseous refrigerant D (gaseous refrigerant) generated by the vaporization of liquid refrigerant C in the inner heat exchange chamber 21 through primary heat exchange with the first heat exchange tube 4 and by the vaporization of liquid refrigerant C in the full liquid zone B of the outer heat exchange chamber 12 through secondary heat exchange with the second heat exchange tube 6 from the top layer of the outer heat exchange chamber 12 and transport it to the outside of the outer shell 1 to realize refrigerant circulation.

[0073] The heat exchanger liquid distribution structure provided by this utility model sets the shell-and-tube evaporator in a double-shell layout, with an outer heat exchange cavity 12 formed between the inner shell 2 and the outer shell 1, and an inner heat exchange cavity 21 formed inside the inner shell 2. At the same time, a full liquid zone B for accumulating liquid refrigerant C is formed at the bottom of the outer heat exchange cavity 12 and below the drain port 251 at the bottom of the inner shell 2. A liquid equalization structure 3 and multiple first heat exchange tubes 4 are respectively arranged on the upper and lower layers of the inner heat exchange cavity 21. Multiple second heat exchange tubes 6 are immersed in the liquid refrigerant C in the full liquid zone B, thereby dividing the heat exchanger liquid distribution structure into a falling film zone A (including the inner shell 2, the inner heat exchange cavity 21, the liquid equalization structure 3, and the first heat exchange tubes 4) arranged vertically and horizontally, and a full liquid zone B (including the liquid refrigerant C accumulated at the bottom of the outer heat exchange cavity 12 and the first heat exchange tubes 4).

[0074] Thus, the liquid refrigerant C introduced from the outside into the heat exchanger distribution structure first enters the inner heat exchange chamber 21, and is distributed downwards into the space of the inner heat exchange chamber 21 through the liquid equalization structure 3. The liquid refrigerant C distributed into the space of the inner heat exchange chamber 21 through the liquid equalization structure 3 undergoes a heat exchange once through multiple first heat exchange tubes 4.

[0075] Then, the gaseous refrigerant D, formed by the vaporization of liquid refrigerant C after one heat exchange, escapes from the inner heat exchange chamber 21 and enters the outer heat exchange chamber 12. It then moves from the outer heat exchange chamber 12 to the top of the outer shell 1 until it is discharged from the outer heat exchange chamber 12 through the suction pipe 11 at the top of the outer shell 1 and transported to the outside of the outer shell 1 to realize refrigerant circulation. Meanwhile, the liquid refrigerant C that has not vaporized after one heat exchange is discharged from the inner shell 2 through the drain port 251 at the bottom of the inner shell 2 and enters the bottom of the outer heat exchange chamber 12, and drips onto the inner wall surface of the outer shell 1 at the bottom of the outer heat exchange chamber 12. As the heat exchange process continues, it gradually accumulates at the bottom of the outer heat exchange chamber 12 to form a full liquid area B, and multiple second heat exchange tubes 6, which are preset in the corresponding positions of the full liquid area B, are immersed in the liquid refrigerant C in the full liquid area B.

[0076] Subsequently, the liquid refrigerant C in the full liquid zone B undergoes secondary heat exchange through multiple second heat exchange tubes 6. The gaseous refrigerant D formed by the vaporization of the liquid refrigerant C after secondary heat exchange rises to the liquid surface in the full liquid zone B, breaks and dissipates, and enters the external heat exchange chamber 12. It is then discharged from the external heat exchange chamber 12 and the suction pipe 11 and transported to the outside to realize refrigerant circulation.

[0077] In summary, the liquid distribution structure of the heat exchanger provided by this utility model combines the advantages of both falling film shell-and-tube evaporators and flooded shell-and-tube evaporators. It alleviates the problem of poor primary heat exchange efficiency in the upper half of the falling film zone A due to the limited liquid distribution performance of the liquid distribution structure 3, which causes the liquid refrigerant C to spread downwards and the refrigerant received by each of the first heat exchange tubes 4. The excess liquid refrigerant C overflowing from the upper half of the falling film zone A due to insufficient primary heat exchange can be gathered to form the lower half of the flooded zone B, and the liquid refrigerant C in the flooded zone B can be used to soak multiple second heat exchange tubes 6 and achieve secondary heat exchange with them.

[0078] Because the liquid level and number of heat exchange tube layers in the lower half of the flooded zone B are much smaller than those in traditional flooded shell-and-tube evaporators, the gaseous refrigerant D formed by the vaporization of liquid refrigerant C after secondary heat exchange is more likely to rise to the liquid surface in the flooded zone B, break down, dissipate, and enter the external heat exchange chamber 12. This alleviates to some extent the drawback of traditional flooded shell-and-tube evaporators where the gaseous refrigerant D bubbles H generated by the vaporization of liquid refrigerant C during heat exchange are difficult to rise to the liquid surface and break down, causing bubbles H to easily adhere to the heat exchange tube wall and hinder heat exchange. Therefore, the liquid distribution structure of this heat exchanger effectively improves the heat exchange efficiency of the evaporator by combining the upper and lower falling film zone A and the flooded zone B.

[0079] Please refer to the following: Figure 6-7 In one embodiment of the heat exchanger liquid distribution structure provided by this utility model, the heat exchanger liquid distribution structure further includes:

[0080] Multiple liquid storage trays 5 are spaced apart in the inner heat exchange cavity 21 along the height direction of the inner shell 2. They are used to receive the liquid refrigerant C that is dispersed downward from the liquid equalization structure 3 above, and to overflow the liquid refrigerant C into the liquid storage trays 5 below or into the space of the inner heat exchange cavity 21.

[0081] Several first heat exchange tubes 4 are immersed in liquid refrigerant C stored in liquid storage tray 5.

[0082] In a preferred embodiment of the heat exchanger liquid distribution structure provided by this utility model, the liquid storage tray 5 includes a first tray 51 and a second tray 52. ​​Both the first tray 51 and the second tray 52 are horizontally arranged, and the first tray 51 has a larger dimension (area) in the horizontal direction than the second tray 52, so that more first heat exchange tubes 4 can be arranged side by side inside the first tray 51.

[0083] In a preferred embodiment of the heat exchanger liquid distribution structure provided by this utility model, both the outer shell 1 and the inner shell 2 are cylindrical, and a pair of end faces of the outer shell 1 are vertically arranged. The axis of the outer shell 1 is parallel to the horizontal direction, and the radial direction of the outer shell 1 is parallel to the vertical direction. The top surface of the inner shell 2 is horizontally arranged, the axis of the inner shell 2 is parallel to the vertical direction, and the radial direction of the inner shell 2 is parallel to the horizontal direction.

[0084] The horizontal dimension (area) of the first tray 51 is close to the inner diameter of the inner shell 2 (i.e., the radial dimension of the inner heat exchange cavity 21). Multiple first trays 51 are spaced apart and directly opposite each other in the height direction of the inner shell 2 and the two ends of the first tray 51 in the radial direction are their overflow ends, so as to ensure that the liquid refrigerant C forms a long overflow path in the first tray 51 to achieve sufficient heat exchange.

[0085] Multiple sets of second trays 52 are spaced apart in the inner heat exchange cavity 21 along the height direction of the inner shell 2. Each set of second trays 52 is located between two adjacent first trays 51. Each set of second trays 52 includes a pair (two) of second trays 52 spaced apart in the horizontal direction. The horizontal dimension (area) of the second trays 52 is slightly smaller than half of the inner diameter of the inner shell 2 (i.e., the radial dimension of the inner heat exchange cavity 21). The pair (two) of second trays 52 in each set extend radially to both ends of the first tray 51. The end of the pair (two) of second trays 52 in each set that is closer to the other second tray 52 is its overflow end. This ensures that the second tray 52 can fully receive the liquid refrigerant C overflowing from the upper first tray 51 and fully overflow into the lower first tray 51. This ensures that the liquid refrigerant C forms a long overflow path in the second tray 52 and achieves sufficient heat exchange.

[0086] The heat exchanger liquid distribution structure provided by this utility model has an upper falling film zone A in which liquid refrigerant C is stored in layered liquid storage trays 5 to immerse the first heat exchange tubes 4, achieving primary heat exchange in the inner heat exchange chamber 21. Simultaneously, the liquid storage trays 5 are arranged in an orderly, staggered manner, forming a terraced flow pattern, allowing the liquid refrigerant C to overflow layer by layer along the liquid storage trays 5. After each layer of liquid storage tray 5 is filled with liquid refrigerant C, it continues to overflow into the next layer of liquid storage tray 5. This further alleviates the problem of uneven distribution of liquid refrigerant C and the distribution of refrigerant received by each first heat exchange tube 4 due to the limited liquid uniformity performance of the liquid uniformity structure 3 in the upper falling film zone A, thus improving the efficiency of primary heat exchange of liquid refrigerant C in the upper falling film zone A.

[0087] In other embodiments of the heat exchanger liquid distribution structure provided by this utility model, the outer shell 1 may also be spherical or other shapes.

[0088] In other embodiments of the heat exchanger liquid distribution structure provided by this utility model, the inner shell 2 may also be a cuboid, a cube, or other shapes.

[0089] Please refer to the following: Figure 6-7 In one embodiment of the heat exchanger liquid distribution structure provided by this utility model, the heat exchanger liquid distribution structure further includes:

[0090] The jet pipe 7 is located at the bottom of the full liquid zone B; the gas delivery pipe 8 connects the inner heat exchange chamber 21 and the jet pipe 7, and is used to deliver the gaseous refrigerant D generated by the liquid refrigerant C and the first heat exchange pipe 4 in the inner heat exchange chamber 21 to the jet pipe 7, so that the jet pipe 7 can spray the gaseous refrigerant D into the liquid refrigerant C in the full liquid zone B.

[0091] Please refer to the following: Figure 6-7 In a preferred embodiment of the heat exchanger liquid distribution structure provided by this utility model, the gas transmission pipeline 8 includes:

[0092] The gas collecting pipe 81 has one end connected to the part between the liquid equalization structure 3 and the uppermost first heat exchange tube 4 in the inner heat exchange cavity 21, and the other end of the gas collecting pipe 81 passes through the top of the inner shell 2 and extends into the outer heat exchange cavity 12; the gas guide pipe 82 connects the other end of the gas collecting pipe 81 to the jet pipe 7, and the top of the jet pipe 7 has multiple jet channels evenly spaced.

[0093] The heat exchanger liquid distribution structure provided by this utility model has a lower half full liquid zone B that can accumulate and gather excess liquid refrigerant C overflowing from the upper falling film zone A, immersing multiple second heat exchange tubes 6 located in the full liquid zone B. It also includes a gas delivery pipe structure 8 composed of a gas collecting pipe 81 and a gas guiding pipe 82, and a jet pipe 7. The gas collecting pipe 81 collects the gaseous refrigerant D generated by vaporization in the upper falling film zone A, and guides and delivers the gaseous refrigerant D to the lower half via the gas guiding pipe 82. In the bottom of the half-filled liquid zone B, through the jet pipe 7, gaseous refrigerant D is injected into the liquid refrigerant C surrounding the second heat exchange tube 6. This causes the liquid refrigerant C in the full-filled liquid zone B to churn. The churning liquid refrigerant C can dislodge the bubbles H (gaseous refrigerant D) generated during the secondary heat exchange and adsorbed on the wall of the second heat exchange tube 6, causing them to float to the surface of the liquid in the full-filled liquid zone B, burst, and dissipate into the external heat dissipation cavity. In summary, this heat exchanger liquid distribution structure effectively solves the problem that bubbles H generated during the secondary heat exchange in the lower half of the full-filled liquid zone B are difficult to float and burst, causing them to adhere to the wall of the second heat exchange tube 6 and hinder secondary heat exchange, thus further improving the overall heat exchange efficiency of the liquid distribution structure for the liquid refrigerant C.

[0094] Please refer to the following: Figure 6-7 In one embodiment of the heat exchanger liquid distribution structure provided by this utility model, the liquid equalization structure 3 includes:

[0095] The liquid distribution pipe 31 is located on the top side of the inner heat exchange chamber 21 and is connected to the liquid inlet pipe 22; the liquid equalizer 32 is located below the liquid distribution pipe 31. The liquid equalizer 32 has multiple liquid equalization channels (not shown in the figure) inside, which are used to evenly distribute the liquid refrigerant C collected in the liquid distribution pipe 31 into the space of the inner heat exchange chamber 21 below through each liquid equalization channel.

[0096] In one embodiment of the heat exchanger liquid distribution structure provided by this utility model, the liquid distributor 32 includes multiple liquid distribution plates (not shown in the figure) spaced apart in the height direction, with a gap layer (not shown in the figure) formed between the liquid distribution plates, and multiple liquid distribution holes (not shown in the figure) evenly distributed on the liquid distribution plates. The diameter of the liquid distribution holes in the lower liquid distribution plates is successively smaller than that in the upper liquid distribution plates, while the number and density of the liquid distribution holes in the lower liquid distribution plates are successively greater than those in the upper liquid distribution plates. The corresponding liquid distribution holes on each liquid distribution plate constitute each liquid distribution channel.

[0097] In one embodiment of the heat exchanger liquid distribution structure provided by this utility model, the liquid distributor 32 is a single liquid distribution plate (not shown in the figure), and multiple liquid distribution channels (not shown in the figure) are evenly spaced on the liquid distribution plate.

[0098] Please refer to the following: Figure 6-7 In one embodiment of the heat exchanger liquid distribution structure provided by this utility model, the inner shell 2 includes:

[0099] Side frame 23 is located inside the outer shell 1; top cover plate 24 is located inside the outer shell 1 and is closedly connected to the top of the side frame 23; bottom cover plate 25 is located inside the outer shell 1 and is closedly connected to the bottom of the side frame 23.

[0100] The liquid inlet pipe 22 is installed on the top cover plate 24 and connects to the inner heat exchange chamber 21. The liquid outlet 251 is installed on the bottom cover plate 25 and connects to the inner heat exchange chamber 21 and the outer heat exchange chamber 12.

[0101] Please refer to the following: Figure 6-7 In one embodiment of the heat exchanger liquid distribution structure provided by this utility model, the bottom sealing plate 25 is a conical plate that gradually slopes downward from the periphery to the center, and the drain port 251 is located at the tip of the cone in the center of the bottom sealing plate 25 to guide the liquid refrigerant C that overflows from each of the upper second heat exchange tubes 6 and drips onto the top surface of the conical plate to the drain port 251 in the center for discharge.

[0102] Please refer to the following: Figure 6-7 This utility model also provides a heat exchanger, including the above-mentioned heat exchanger liquid distribution structure.

[0103] In one embodiment of the heat exchanger provided by this utility model, the heat exchanger is an evaporator.

[0104] In other embodiments of the heat exchanger provided by this utility model, the heat exchanger may also be a condenser.

[0105] Please refer to the following: Figure 5-7 The present invention also provides an air conditioning system, including a compressor 9, a first heat exchanger 20 connected to the exhaust port 92 of the compressor 9 and a throttle valve 30, and further including the aforementioned heat exchanger, which serves as the second heat exchanger 10 of the air conditioning system. The suction pipe 11 is connected to the suction port 91 of the compressor 9 through a refrigerant pipe 40, and the liquid inlet pipe 22 is connected to the first heat exchanger 20 through the refrigerant pipe 40 and the throttle valve 30 provided on the refrigerant pipe 40. The first heat exchanger 20 is connected to the exhaust port 92 of the compressor 9 through the refrigerant pipe 40.

[0106] Please see Figure 5 In one embodiment of the air conditioning system provided by this utility model, the first heat exchanger 20 is a condenser, and the aforementioned heat exchanger (second heat exchanger 10) is an evaporator.

[0107] Please refer to the following: Figure 5-7 The working principle of the heat exchanger liquid distribution structure, heat exchanger, and air conditioning system provided by this utility model is as follows:

[0108] The refrigerant flowing out of the condenser (first heat exchanger 20) is throttled by the throttling valve 30 and flows from the inlet pipe 22 into the top layer of the inner heat exchange chamber 21. It then sequentially enters the distribution pipe 31 and the distributor 32 of the liquid equalization structure 3 in the upper falling film zone A, distributing the liquid refrigerant C evenly like rain into the space of the lower inner heat exchange chamber 21. It is then sprayed onto the first heat exchange tubes 4 in each of the lower liquid storage trays 5 (including the first tray 51 and the second tray 52) for a heat exchange. Simultaneously, the unvaporized liquid refrigerant C after the first heat exchange is stored in the liquid storage trays 5. The first heat exchange tube 4 is soaked and the liquid is soaked to continue the heat exchange until the liquid storage tray 5 is full and the liquid refrigerant C overflows and is received by the lower liquid storage tray 5 and the first heat exchange tube 4. The first tray 51 and the second tray 52 of each layer are staggered, so that the liquid refrigerant C can overflow layer by layer along the liquid storage tray 5 in a terraced manner. After each liquid storage tray 5 is filled with liquid refrigerant C, it continues to overflow to the next liquid storage tray 5. This initially alleviates the problem of poor heat exchange efficiency in the upper falling film zone A due to uneven distribution of refrigerant.

[0109] Excess liquid refrigerant C that has not vaporized in the upper falling film zone A is discharged from the inner heat exchange chamber 21 through the drain port 251 and drips into the lower full liquid zone B. The full liquid zone B collects and gathers the excess liquid refrigerant C overflowing from the upper falling film zone A, forming a refrigerant liquid level higher than the uppermost second heat exchange tube 6, thus completely immersing each layer of the second heat exchange tube 6. At the same time, the gas collecting pipe 81 collects the gaseous refrigerant D generated by vaporization in the upper falling film zone A, and transports the gaseous refrigerant D to the jet pipe in the lower full liquid zone B through the gas guide pipe 82. In section 7, the jet pipe 7 sprays out gaseous refrigerant D and sprays it around the second heat exchange tube 6 in the full liquid zone B, causing the liquid refrigerant C in the full liquid zone B to churn. The churning liquid refrigerant C carries the bubbles H adsorbed on the wall of the second heat exchange tube 6 to the surface of the liquid in the full liquid zone B, where they burst and dissipate. This solves the problem that the bubbles H generated in the lower half of the full liquid zone B are difficult to float and burst during the secondary heat exchange process, which causes the bubbles H to adhere to the wall of the second heat exchange tube 6 and hinder the secondary heat exchange. This further improves the overall heat exchange efficiency of the liquid distribution structure of the heat exchanger for the liquid refrigerant C.

[0110] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Those skilled in the art should understand that any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A heat exchanger liquid distribution structure, comprising an outer shell (1), characterized in that, Also includes: An inner shell (2) is disposed inside the outer shell (1), and an outer heat exchange cavity (12) is formed between the inner shell (2) and the outer shell (1), and an inner heat exchange cavity (21) is formed inside the inner shell (2); The liquid inlet pipe (22) is located at the top of the inner shell (2) and connects the inner heat exchange cavity (21) with the outside of the outer shell (1); The liquid distribution structure (3) is located on the upper layer of the inner heat exchange chamber (21) and is used to evenly distribute the liquid refrigerant (C) introduced into the inner heat exchange chamber (21) through the liquid inlet pipe (22) downwards. Multiple first heat exchange tubes (4) are spaced apart in the inner heat exchange cavity (21) for performing a single heat exchange on the liquid refrigerant (C); The drain port (251) is located at the bottom of the inner shell (2); The liquid-filled area (B) is located at the bottom of the external heat exchange chamber (12) and below the drain port (251), and is formed by the accumulation of liquid refrigerant (C) discharged from the drain port (251); Multiple second heat exchange tubes (6) are intermittently immersed in the liquid refrigerant (C) in the full liquid zone (B) for secondary heat exchange of the liquid refrigerant (C); The suction pipe (11) is located at the top of the outer shell (1) and is used to discharge the gaseous refrigerant (D) generated by the primary heat exchange and the secondary heat exchange from the outer heat exchange chamber (12) to the outer shell (1).

2. The heat exchanger liquid distribution structure as described in claim 1, characterized in that, Also includes: A jet pipe (7) is located at the bottom of the full liquid zone (B); The gas pipeline (8) connects the inner heat exchange chamber (21) and the jet pipe (7) to transport the gaseous refrigerant (D) generated by the first heat exchange from the inner heat exchange chamber (21) to the jet pipe (7) so that the jet pipe (7) can spray the gaseous refrigerant (D) into the liquid refrigerant (C) in the full liquid area (B).

3. The heat exchanger liquid distribution structure as described in claim 1, characterized in that, Also includes: Multiple liquid storage trays (5) are spaced apart in the height direction in the inner heat exchange chamber (21) for receiving the liquid refrigerant (C) distributed from above and overflowing the liquid refrigerant (C) downwards; Several of the first heat exchange tubes (4) are immersed in the liquid refrigerant (C) stored in the liquid storage tray (5).

4. The heat exchanger liquid distribution structure as described in claim 2, characterized in that, The gas pipeline (8) includes: The gas collecting pipe (81) has one end connected to the portion of the inner heat exchange cavity (21) between the liquid equalization structure (3) and the uppermost first heat exchange pipe (4), and the other end of the gas collecting pipe (81) passes through the top of the inner shell (2) and extends to the outer heat exchange cavity (12). The other end of the air guide tube (82) is connected to the air collection tube (81) and the jet tube (7).

5. The heat exchanger liquid distribution structure according to any one of claims 1-4, wherein the liquid equalization structure (3) comprises: A liquid distribution pipe (31) is provided on the top side of the inner heat exchange chamber (21) and connected to the liquid inlet pipe (22); A liquid equalizer (32) is located below the liquid distribution pipe (31) and is used to evenly distribute the liquid refrigerant (C) collected in the liquid distribution pipe (31) downwards.

6. The heat exchanger liquid distribution structure according to any one of claims 1-4, characterized in that, The inner shell (2) includes: Side frame (23) is provided inside the outer shell (1); The top cover plate (24) is located inside the outer shell (1) and is closedly connected to the top of the side frame (23); The bottom sealing plate (25) is located inside the outer shell (1) and is closed and connected to the bottom end of the side frame (23); The liquid inlet pipe (22) is inserted through the top cover plate (24), and the liquid outlet (251) is located on the bottom cover plate (25).

7. The heat exchanger liquid distribution structure as described in claim 6, characterized in that, The bottom sealing plate (25) is a conical plate that gradually slopes downward from the periphery to the center, and the drain port (251) is located at the tip of the cone at the center of the bottom sealing plate (25).

8. A heat exchanger, characterized in that, Includes the heat exchanger liquid distribution structure as described in any one of claims 1-7.

9. The heat exchanger as described in claim 8, characterized in that, The heat exchanger is an evaporator.

10. An air conditioning system comprising a compressor (9), a first heat exchanger (20) communicating with an exhaust port (92) of the compressor (9), and a throttling valve (30), characterized in that, It also includes a heat exchanger as described in claim 8 or 9, the heat exchanger serving as a second heat exchanger (10) of the air conditioning system, the suction pipe (11) being connected to the suction port (91) of the compressor (9), and the liquid inlet pipe (22) being connected to the first heat exchanger (20) through the throttle valve (30).

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