Heat exchanger set and air conditioning system

Abstract

The invention provides a heat exchanger set and an air conditioning system, the heat exchanger set comprises a first heat exchanger, a second heat exchanger, a third heat exchanger and a fourth heat exchanger, the first refrigerant flow channel is formed between the first refrigerant inlet and the first refrigerant outlet; the first heat exchange tube bundle is arranged in the first shell; the second heat exchanger comprises a second shell provided with a second refrigerant inlet and a second refrigerant outlet; the second refrigerant flow channel is formed between the second refrigerant inlet and the second refrigerant outlet; the third heat exchange tube bundle is arranged in the second shell, and the third heat exchange tube bundle communicates with the first heat exchange tube bundle; the third heat exchanger comprises a third refrigerant flow channel communicated with the first refrigerant flow channel; a first heat exchange runner; the fourth heat exchanger comprises a fourth refrigerant flow channel communicated with the second refrigerant flow channel and a second heat exchange flow channel, and an inlet of the fourth heat exchanger is communicated with an outlet of the first heat exchange flow channel. The temperature of the refrigerant entering the second heat exchanger can be reduced, the supercooling degree of the refrigerant is increased, and the heating effect is improved.

Description

[0001] Priority Declaration

[0002] This application claims priority to the Chinese patent application filed with the China Patent Office on March 20, 2024, with application number CN202410323799.1 and invention name “Heat exchanger group and air conditioning system”, the entire contents of which are incorporated by reference into this application. Technical Field

[0003] The present application relates to the field of refrigeration equipment, specifically a heat exchanger group and an air-conditioning system. Background Art

[0004] For air conditioning hot and cold water units or chillers, the heat generated by the high-temperature and high-pressure gaseous refrigerant in the condenser during heat release can raise the water temperature to a higher level. To ensure good unit efficiency, it is necessary to ensure that the refrigerant at the condenser outlet can have a certain degree of subcooling or a lower liquid refrigerant temperature. However, if Figure 1 In the heat exchanger of the air-conditioning system shown, the water paths of the first condenser 100 and the second condenser 200 are connected in series. The water inlet temperature of the second condenser 200 (the water outlet temperature of the first condenser 100) is relatively high, which will limit the subcooling degree of the second condenser 200, resulting in the refrigerant at the outlet of the second condenser 200 being difficult to obtain a greater subcooling degree or a lower liquid refrigerant temperature, affecting the overall heating performance of the air-conditioning hot and cold water unit or the chiller. Summary of the Invention

[0005] The present application provides a heat exchanger group and an air-conditioning system, which are used to at least solve or alleviate some of the problems existing in the prior art.

[0006] A first aspect of the present application provides a heat exchanger assembly, comprising:

[0007] The first heat exchanger comprises:

[0008] a first shell having a first refrigerant inlet and a first refrigerant outlet;

[0009] a first refrigerant flow channel formed between the first refrigerant inlet and the first refrigerant outlet;

[0010] A first heat exchange tube bundle is disposed in the first shell;

[0011] The second heat exchanger comprises:

[0012] The second shell is provided with a second refrigerant inlet and a second refrigerant outlet;

[0013] a second refrigerant flow channel formed between the second refrigerant inlet and the second refrigerant outlet;

[0014] a third heat exchange tube bundle, disposed in the second shell, wherein the inlet of the third heat exchange tube bundle is connected to the outlet of the first heat exchange tube bundle;

[0015] The third heat exchanger comprises:

[0016] a third refrigerant flow channel, communicating with the first refrigerant flow channel;

[0017] a first heat exchange flow channel;

[0018] The fourth heat exchanger comprises:

[0019] The fourth refrigerant flow channel is connected to the second refrigerant flow channel,

[0020] The inlet of the second heat exchange channel is connected to the outlet of the first heat exchange channel.

[0021] In an optional technical solution, the third heat exchanger is disposed in the first shell, the first heat exchange flow channel is a second heat exchange tube bundle disposed in the first shell, and the second heat exchange tube bundle is disposed closer to the first refrigerant outlet than the first heat exchange tube bundle; the third refrigerant flow channel and the first refrigerant flow channel together constitute an empty space inside the first shell;

[0022] The fourth heat exchanger is arranged in the second shell, and the second heat exchange flow channel is a fourth heat exchange tube bundle arranged in the second shell. The fourth heat exchange tube bundle is arranged closer to the second refrigerant outlet than the third heat exchange tube bundle; the fourth refrigerant flow channel and the second refrigerant flow channel together constitute the empty space inside the second shell.

[0023] In an optional technical solution, the first heat exchanger further includes:

[0024] The first shell tube sheets are respectively arranged at both ends of the first shell to fix the first heat exchange tube bundle and the second heat exchange tube bundle.

[0025] The first heat exchanger end covers are respectively provided at both ends of the first shell,

[0026] The first shell tube sheet is arranged corresponding to the first heat exchanger end cover and is surrounded by the first heat exchanger end cover to form a first chamber.

[0027] At least one first partition is provided in the first chamber to separate the first chamber into a first heat exchange tube bundle chamber communicating with the first heat exchange tube bundle and a second heat exchange tube bundle chamber communicating with the second heat exchange tube bundle.

[0028] In an optional technical solution, the second heat exchanger further includes,

[0029] The second shell tube sheets are respectively arranged at both ends of the second shell to fix the third heat exchange tube bundle and the fourth heat exchange tube bundle.

[0030] The second heat exchanger end covers are respectively provided at both ends of the second shell,

[0031] The second shell tube sheet is arranged corresponding to the second heat exchanger end cover and is surrounded by the second heat exchanger end cover to form a second chamber.

[0032] At least one second partition is disposed in the second chamber to separate the second chamber into a first accommodating chamber communicating with the third heat exchange tube bundle and a second accommodating chamber communicating with the fourth heat exchange tube bundle.

[0033] In an optional technical solution, the second heat exchanger further includes,

[0034] Two third partitions are arranged in the second chamber to divide the second chamber into a third accommodating chamber communicating with the third heat exchange tube bundle, a fourth accommodating chamber communicating with the fourth heat exchange tube bundle, and a fifth accommodating chamber between the third accommodating chamber and the fourth accommodating chamber.

[0035] In an optional technical solution, the fourth accommodating chamber is connected to the first heat exchange tube bundle chamber through a pipeline.

[0036] The first heat exchange tube bundle chamber is connected to the fifth accommodating chamber through a pipeline.

[0037] The fifth accommodating chamber is communicated with the third accommodating chamber through the third heat exchange tube bundle.

[0038] In an optional technical solution, a first water pump is further provided on the pipeline connecting the fourth accommodating chamber and the first heat exchange tube bundle chamber.

[0039] In an optional technical solution, the second heat exchange tube bundle chamber is connected to the fifth accommodating chamber through a pipeline.

[0040] The fourth heat exchange tube bundle is connected to the first heat exchanger bundle chamber through a pipeline.

[0041] The first heat exchange tube bundle chamber is connected to the fifth accommodating chamber through a pipeline.

[0042] The fifth accommodating chamber is communicated with the third accommodating chamber through the third heat exchange tube bundle.

[0043] In an optional technical solution, a second water pump is further provided on the pipeline connecting the fourth heat exchange tube bundle and the first heat exchanger bundle chamber.

[0044] In an optional technical solution, the first heat exchanger and the second heat exchanger are both condensers.

[0045] In an optional technical solution, the outlet of the fourth heat exchange tube bundle is connected to the inlet of the third heat exchange tube bundle through a pipeline.

[0046] In an optional technical solution, a third water pump is provided on the pipeline connecting the outlet of the fourth heat exchange tube bundle and the inlet of the third heat exchange tube bundle.

[0047] In an optional technical solution, the third heat exchanger is arranged on the outside of the first shell, and the inlet of the third refrigerant flow channel is connected to the first refrigerant outlet; the fourth heat exchanger is arranged on the outside of the second shell, and the inlet of the fourth refrigerant flow channel is connected to the second refrigerant outlet.

[0048] In an optional technical solution, a fourth water pump is provided on the pipeline connecting the first heat exchange channel and the second heat exchange channel.

[0049] In an optional technical solution, the outlet of the second heat exchange channel is connected to the inlet of the third heat exchange tube bundle through a pipeline.

[0050] In an optional technical solution, a fifth water pump is provided on the pipeline connecting the outlet of the second heat exchange channel and the inlet of the third heat exchange tube bundle.

[0051] On the other hand, the present application provides an air-conditioning system, comprising the above-mentioned heat exchanger group as a condenser. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Figure 1 It is a structural diagram of a heat exchanger group in the prior art.

[0053] Figure 2 It is a structural schematic diagram of the heat exchanger group in the first embodiment of the present application.

[0054] Figure 3 It is a structural schematic diagram of the heat exchanger group in the second embodiment of the present application.

[0055] Figure 4 It is a structural schematic diagram of the heat exchanger group in the third embodiment of the present application.

[0056] Figure 5 It is a structural schematic diagram of the heat exchanger group in the fourth embodiment of the present application.

[0057] Figure 6 It is a structural schematic diagram of the heat exchanger group in the fifth embodiment of the present application.

[0058] Figure 7 It is a structural diagram of the heat exchanger group in the sixth embodiment of the present application.

[0059] Reference numerals:

[0060] Existing technology:

[0061] First condenser 100; second condenser 200;

[0062] This application:

[0063] First heat exchanger 1; first shell 11; first heat exchange tube bundle 12; first tube body 121; second tube body 122; second heat exchange tube bundle 13 (first heat exchange flow channel 13); first shell tube sheet 14; first heat exchanger end cover 15; first chamber 16; first heat exchange tube bundle chamber 161; chamber 161A; chamber 161B; second heat exchange tube bundle chamber 162; third heat exchange tube bundle chamber 163; fourth heat exchange tube bundle chamber 164; first baffle 17; fourth baffle 18; fifth baffle 19;

[0064] Second heat exchanger 2; second shell 21; third heat exchange tube bundle 22; third tube body 221; fourth tube body 222; fourth heat exchange tube bundle 23 (second heat exchange flow channel 23); second shell tube sheet 24; second heat exchanger end cover 25; second chamber 26; first accommodating chamber 261; accommodating chamber 261A; accommodating chamber 261B; second accommodating chamber 262; third accommodating chamber 263; fourth accommodating chamber 264; fifth accommodating chamber 265; second partition 27; third partition 28; sixth partition 29; first water pump 31; second water pump 32; third water pump 33; fourth water pump 34;

[0065] The first refrigerant flow channel 111 ; the second refrigerant flow channel 211 ; the third heat exchanger 6 ; the third refrigerant flow channel 61 ; the first heat exchange flow channel 62 ; the fourth heat exchanger 7 ; the fourth refrigerant flow channel 71 ; and the second heat exchange flow channel 72 . DETAILED DESCRIPTION

[0066] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0067] <First embodiment>

[0068] like Figure 2As shown, the first aspect of the present application provides a heat exchanger assembly, comprising a first heat exchanger 1 and a second heat exchanger 2, which are interconnected. The first heat exchanger 1 comprises a first shell 11 and a first heat exchange tube bundle 12 and a second heat exchange tube bundle 13 disposed within the first shell 11. The first shell 11 is provided with a first refrigerant inlet and a first refrigerant outlet. The second heat exchange tube bundle 13 is disposed closer to the first refrigerant outlet than the first heat exchange tube bundle 12. The second heat exchanger 2 comprises a second shell 21 and a third heat exchange tube bundle 22 and a fourth heat exchange tube bundle 23 disposed within the second shell 21. The second shell 21 is provided with a second refrigerant inlet and a second refrigerant outlet. The fourth heat exchange tube bundle 23 is disposed closer to the second refrigerant outlet than the third heat exchange tube bundle 22. The first heat exchange tube bundle 12 is interconnected with the third heat exchange tube bundle 22, and the second heat exchange tube bundle 13 is interconnected with the fourth heat exchange tube bundle 23.

[0069] Specifically, the heat exchange medium flowing in the first heat exchange tube bundle 12, the second heat exchange tube bundle 13, the third heat exchange tube bundle 22 and the fourth heat exchange tube bundle 23 is preferably water. Water is used as an example below. Of course, the heat exchange medium is not limited to water, and other fluids that can exchange heat with the refrigerant are applicable to this application.

[0070] When both the first heat exchanger 1 and the second heat exchanger 2 serve as condensers, high-temperature, high-pressure gaseous refrigerant enters the first heat exchanger 1 through the first refrigerant inlet. Within the first heat exchanger 1, the heat of the high-temperature, high-pressure gaseous refrigerant is absorbed by the water in the first heat exchange tube bundle 12 and the second heat exchange tube bundle 13. During the heat exchange process, the high-temperature, high-pressure refrigerant gradually condenses into a high-pressure liquid, and its temperature gradually decreases, completing the condensation process. Because the second heat exchange tube bundle 13 is closer to the first refrigerant outlet, the refrigerant exchanges heat with the first heat exchange tube bundle 12 and the second heat exchange tube bundle 13 from the first refrigerant inlet, and then is discharged from the first refrigerant outlet. Similarly, in the second heat exchanger 2, high-temperature, high-pressure gaseous refrigerant enters the second refrigerant inlet, exchanges heat with the third heat exchange tube bundle 22 and the fourth heat exchange tube bundle 23, and then is discharged from the second refrigerant outlet.

[0071] It should be noted that the attached Figures 1 to 4 The refrigerant inlet and refrigerant outlet indicated in the figure are for reference only, indicating that refrigerant is entering and refrigerant is flowing out, and do not indicate the actual positions of the first refrigerant inlet, the first refrigerant outlet, the second refrigerant inlet, and the second refrigerant outlet; preferably, as Figures 1 to 4 In the direction shown, in the first heat exchanger 1, the refrigerant enters from the top of the first shell 11 and flows out from the bottom of the first shell 11. In the second heat exchanger 2, the refrigerant enters from the top of the second shell 21 and flows out from the bottom of the second shell 21. The top and bottom here can be the top and bottom of the corresponding shell in the radial direction.

[0072] Furthermore, in the first heat exchanger 1, because the high-temperature, high-pressure refrigerant exchanges heat with the first heat exchange tube bundle 12 and the second heat exchange tube bundle 13 sequentially from the first refrigerant inlet, the heat exchange medium in the first heat exchange tube bundle 12 has a relatively high temperature after absorbing the heat of the high-temperature, high-pressure gaseous refrigerant. However, after the high-temperature, high-pressure gaseous refrigerant exchanges heat with the first heat exchange tube bundle 12, most or all of the gaseous refrigerant is condensed into liquid. The condensed liquid refrigerant further exchanges heat with the second heat exchange tube bundle 13, causing the temperature of this portion of liquid refrigerant after heat exchange with the second heat exchange tube bundle 13 to further decrease. The heat exchange medium in the second heat exchange tube bundle 13 absorbs the heat of the refrigerant after passing through the first heat exchange tube bundle 12, resulting in a relatively low temperature (compared to the first heat exchange tube bundle 12 directly exchanging heat with the high-temperature gaseous refrigerant). That is, when the first heat exchange tube bundle 12 and the second heat exchange tube bundle 13 are configured substantially the same, the temperature rise of the heat exchange medium in the first heat exchange tube bundle 12 is greater than the temperature rise of the heat exchange medium in the second heat exchange tube bundle 13.

[0073] Compared with the prior art, the first condenser 100 includes only one heat exchange medium outlet. After the heat exchange medium exchanges heat with the refrigerant in the first condenser 100, it absorbs the heat released by the refrigerant in the first condenser 100 and then enters the second condenser 200 to exchange heat with the refrigerant in the second condenser 200, resulting in a small temperature difference between the heat exchange medium and the refrigerant in the second condenser 200, a small degree of subcooling at the condenser outlet of the second condenser 200, and a poor heat exchange effect. In this application, the second heat exchange tube bundle 13 is close to the first refrigerant outlet in the flow direction of the refrigerant. The heat exchange medium in the second heat exchange tube bundle 13 has a lower outlet temperature than the heat exchange medium in the first heat exchange tube bundle 12. By connecting the second heat exchange tube bundle 13 with the fourth heat exchange tube bundle 23 of the second heat exchanger 2, the inlet temperature of the heat exchange medium entering the fourth heat exchange tube bundle 23 of the second heat exchanger 2 is reduced, and the temperature difference between the heat exchange medium in the fourth heat exchange tube bundle 23 and the refrigerant in the second heat exchanger 2 is increased, thereby improving the heat exchange effect, so that the refrigerant at the outlet of the second heat exchanger 2 can ensure a greater degree of subcooling, which is beneficial to improving the overall heating efficiency and heating capacity of the heat exchanger group.

[0074] In addition, in the present application, the ratio of the flow rate of the heat exchange medium flowing through the second heat exchange tube bundle 13 to the flow rate of the heat exchange medium flowing through the first heat exchange tube bundle 12 is not particularly limited and can be appropriately adjusted according to the heat exchanger capacity load, etc.

[0075] However, as a preferred solution, the flow rate of the heat exchange medium flowing through the second heat exchange tube bundle 13 can be less than the flow rate of the heat exchange medium in the first heat exchange tube bundle 12, and the flow rate of the heat exchange medium flowing through the third heat exchange tube bundle 22 is greater than the flow rate of the heat exchange medium in the fourth heat exchange tube bundle 23 (for example, the amount of water flowing through the first heat exchange tube bundle 12 and the third heat exchange tube bundle 22 is 90%, and the amount of water flowing through the second heat exchange tube bundle 13 and the fourth heat exchange tube bundle 23 is 10%).

[0076] Continue reading Figure 2 As shown, in one embodiment of the present application, the first heat exchanger 1 further includes: two first shell tube sheets 14, two first heat exchanger end covers 15, two first chambers 16, and at least one first partition plate 17. The two first shell tube sheets 14 are respectively disposed at the interior ends of the first shell 11 and are used to fix the first heat exchange tube bundle 12 and the second heat exchange tube bundle 13; the two first heat exchanger end covers 15 are respectively disposed at the ends of the first shell 11, and the two first shell tube sheets 14 are respectively disposed corresponding to the two first heat exchanger end covers 15, and together with the first heat exchanger end covers 15, form two first chambers 16; at least one first partition plate 17 is disposed in the first chamber 16, and separates the first chamber 16 into a first heat exchange tube bundle chamber 161 communicating with the first heat exchange tube bundle 12 and a second heat exchange tube bundle chamber 162 communicating with the second heat exchange tube bundle 13.

[0077] The second heat exchanger 2 further includes two second shell tube sheets 24, two second heat exchanger end covers 25, two second chambers 26, and at least one second partition plate 27. The two second shell tube sheets 24 are disposed at both ends of the second shell 21, respectively, for securing the third heat exchange tube bundle 22 and the fourth heat exchange tube bundle 23. The two second heat exchanger end covers 25 are disposed at both ends of the second shell 21, and the two second shell tube sheets 24 are disposed corresponding to the two second heat exchanger end covers 25, and together with the second heat exchanger end covers 25, they form two second chambers 26. The at least one second partition plate 27 is disposed in the second chamber 26, dividing the second chamber 26 into a first accommodating chamber 261 communicating with the third heat exchange tube bundle 22 and a second accommodating chamber 262 communicating with the fourth heat exchange tube bundle 23.

[0078] Specifically, if Figure 2 As shown, when the first heat exchanger 1 and the second heat exchanger 2 are connected in series, only a first partition 17 is provided on the outlet side of the first heat exchanger 1, and a second partition 27 is provided on the inlet side of the second heat exchanger 2. The first heat exchange tube bundle 12 is connected to the third heat exchange tube bundle 22, and the second heat exchange tube bundle 13 is connected to the fourth heat exchange tube bundle 23.

[0079] In this way, only minor structural changes need to be made to one of the two first chambers 16 of the first heat exchanger 1 (the water outlet side of the first heat exchanger 1) and to one of the inlets of the two second chambers 26 of the second heat exchanger 2 (the water inlet side of the second heat exchanger 2), so as to reduce the temperature of part of the heat exchange medium entering the second heat exchanger 2, thereby improving the overall heating capacity and heating efficiency of the heat exchanger group and saving costs.

[0080] In the embodiment of the present application, in the series-arranged heat exchanger group, the first heat exchange tube bundle 12, the second heat exchange tube bundle 13, the third heat exchange tube bundle 22, and the fourth heat exchange tube bundle 23 are all single-pass heat exchange tube bundles. Single-pass heat exchange tube bundles have the advantage of high flow rates. Technicians can select heat exchange tube bundles of different passes based on actual needs, ensuring that the connections between the different heat exchange tube bundles follow the above connection relationship. This embodiment does not limit this.

[0081] Another aspect of the present application provides an air conditioning system including the aforementioned heat exchanger assembly as a condenser. By employing the aforementioned heat exchanger assembly as the condenser, under the same operating conditions as the air conditioning system's compressor assembly (same refrigerant temperature and pressure at the compressor assembly outlet), the refrigerant outlet temperature of the second heat exchanger 2 can be lowered to a lower temperature, thereby ensuring subcooling of the second heat exchanger 2 and improving the overall heating capacity and efficiency of the heat exchanger assembly and the air conditioning system.

[0082] The above embodiment of the present application is described by taking as an example the water inlet temperature of the first chamber 16 on the water inlet side of the first heat exchanger 1 being 50° C. and the water outlet temperature of the second chamber 26 on the water outlet side of the second heat exchanger 2 being 70° C.

[0083] The water at 50°C entering the first chamber 16 exchanges heat with the refrigerant through the second heat exchange tube bundle 13 and flows out of the second heat exchange tube bundle chamber 162. At this time, for example, the water outlet temperature is 51.5°C, which is lower than Figure 1 As shown in the prior art, the outlet water temperature of the first condenser 100 is 60°C, which significantly reduces the inlet water temperature of part of the second heat exchanger 2; further, the temperature of the refrigerant flowing out of the first heat exchanger 1 is 53°C, and the temperature of the refrigerant flowing out of the second heat exchanger 2 is 54.5°C, which is slightly higher than the temperature of the refrigerant flowing out of the first heat exchanger 1, but still lower than the refrigerant temperature (63°C) at the outlet of the second condenser 200 in the prior art, that is, by introducing the water in the second heat exchange tube bundle 13 into the fourth heat exchange tube bundle 23 to exchange heat with the refrigerant in the second heat exchanger 2, the refrigerant temperature at the outlet of the second heat exchanger 2 can be reduced, and the subcooling degree and heating effect of the refrigerant outlet of the second heat exchanger 2 can be improved.

[0084] In some embodiments, the air conditioning system may be a series counter-flow chiller. It should be noted that this application does not limit other structures and connection relationships of the air conditioning system, as long as it can form a complete refrigerant circulation loop.

[0085] <Second embodiment>

[0086] like Figure 3 As shown, the second embodiment of the present application provides a heat exchanger assembly, which differs from the first embodiment in the waterway-side communication between the first heat exchanger 1 and the second heat exchanger 2, and the structure of the first chamber 16 of the first heat exchanger 1 or the second chamber 26 of the second heat exchanger 2. Furthermore, the first heat exchanger 1 also includes a fourth partition plate 18, which is disposed in the first chamber 16 on the water inlet side of the first heat exchanger 1 and divides the first chamber 16 (the first chamber 16 on the right side of the drawing) into a third heat exchange tube bundle chamber 163 and a fourth heat exchange tube bundle chamber 164. The first partition 17 separates the first chamber 16 on the left side of the drawing into a first heat exchange tube bundle chamber 161 and a second heat exchange tube bundle chamber 162. The third heat exchange tube bundle chamber 163 communicates with the first heat exchange tube bundle 12, and the fourth heat exchange tube bundle chamber 164 communicates with both the first heat exchange tube bundle 12 and the second heat exchange tube bundle 13. The first heat exchange tube bundle 12 is a dual-flow tube bundle, including a first tube body 121 and a second tube body 122 arranged in parallel and connected to each other through the first heat exchange tube bundle chamber 161. The two ends of the first tube body 121 respectively communicate with the first heat exchange tube bundle chamber 161 and the third heat exchange tube bundle chamber 163, while the two ends of the second tube body 122 respectively communicate with the first heat exchange tube bundle chamber 161 and the fourth heat exchange tube bundle chamber 164. The two ends of the second heat exchange tube bundle 13 respectively communicate with the second heat exchange tube bundle chamber 162 and the fourth heat exchange tube bundle chamber 164.

[0087] like Figure 3 As shown, the second heat exchanger 2 further includes two third partitions 28, which are arranged in one of the second chambers 26 of the second heat exchanger 2. The two third partitions 28 separate the second chamber 26 (the second chamber 26 on the right side of the drawing) into a third accommodating chamber 263 communicating with the third heat exchange tube bundle 22, a fourth accommodating chamber 264 communicating with the fourth heat exchange tube bundle 23, and a fifth accommodating chamber 265 between the third accommodating chamber 263 and the fourth accommodating chamber 264. The fifth accommodating chamber 265 corresponds to the third accommodating chamber 263. A heat exchange tube bundle 22 is provided; wherein, the third heat exchange tube bundle 22 is a double-flow tube bundle, including a third tube body 221 and a fourth tube body 222 arranged in parallel and connected to each other through the first accommodating cavity 261, the two ends of the third tube body 221 are respectively connected to the first accommodating cavity 261 and the third accommodating cavity 263, and the two ends of the fourth tube body 222 are respectively connected to the first accommodating cavity 261 and the fifth accommodating cavity 265; the two ends of the fourth heat exchange tube bundle 23 are respectively connected to the second accommodating cavity 262 and the fourth accommodating cavity 264.

[0088] In this embodiment, the water connection between the first heat exchanger 1 and the second heat exchanger 2 is as follows: the fourth accommodating chamber 264 of the second heat exchanger 2 communicates with the first heat exchange tube bundle chamber 161 of the first heat exchanger 1 via an external pipeline. The first heat exchange tube bundle chamber 161 communicates with the third heat exchange tube bundle chamber 163 via the first tube body 121, and then communicates with the fifth accommodating chamber 265 of the second heat exchanger 2 via an external pipeline. The fifth accommodating chamber 265 communicates with the third accommodating chamber 263 via the third heat exchange tube bundle 22 and the first accommodating chamber 261.

[0089] In some preferred embodiments, the baffles disposed within the first chamber 16 may be collectively referred to as first baffles 17, and the baffles disposed within the second chamber 26 may be collectively referred to as second baffles 27. The chambers communicating with the first heat exchange tube bundle 12 are collectively referred to as first heat exchange tube bundle chambers 161, and the chambers communicating with the second heat exchange tube bundle are collectively referred to as second heat exchange tube bundle chambers 162. The chambers communicating with the third heat exchange tube bundle 22 are collectively referred to as first accommodating chambers 261, and the chambers communicating with the fourth heat exchange tube bundle 24 are collectively referred to as second accommodating chambers 262. For ease of reading and understanding, the first and second baffles 17, 27, heat exchange tube bundle chambers, and accommodating chambers have been renamed based on their locations (primarily for the chambers on the inlet side (water inlet side) of the first heat exchanger 1 and the accommodating chambers on the outlet side (water outlet side) of the second heat exchanger 2).

[0090] The structures of the first heat exchanger 1 and the second heat exchanger 2 have been specifically described above, and the water flow directions thereof will be described below.

[0091] In this embodiment, water as the heat exchange medium enters the first heat exchange tube bundle 12 and the second heat exchange tube bundle 13 from the fourth heat exchange tube bundle chamber 164 of the first heat exchanger 1:

[0092] The water entering the second heat exchange tube bundle 13 enters the second accommodating chamber 262 of the second heat exchanger 2 through the second heat exchange tube bundle chamber 162. After heat exchange in the fourth heat exchange tube bundle 23, it flows out through the fourth accommodating chamber 264 and enters the first heat exchange tube bundle chamber 161 of the first heat exchanger 1. After mixing with the water flowing through the second tube body 122, it flows through the first tube body 121 and flows out through the third heat exchange tube bundle chamber 163. Then, it enters the fifth accommodating chamber 265 of the second heat exchanger 2 through the external pipeline, flows through the fourth tube body 222, the first accommodating chamber 261, and the third tube body 221, and is finally discharged from the third accommodating chamber 263, completing the heat exchange and flowing out of the second heat exchanger 2.

[0093] As described above, the first heat exchange tube bundle 12 is a dual-flow tube bundle including a first tube body 121 and a second tube body 122. The water entering the second tube body 122 of the first heat exchange tube bundle 12 merges with the water from the fourth accommodating chamber 264 when entering the first heat exchange tube bundle chamber 161. This point will not be repeated here.

[0094] In this embodiment, after the inlet water of the heat exchanger group enters the heat exchanger group from the fourth heat exchange tube bundle chamber 164 of the first heat exchanger 1, part of the inlet water first flows through the second heat exchange tube bundle 13 of the first heat exchanger 1, and then flows through the fourth heat exchange tube bundle 23 of the second heat exchanger 2. After exchanging heat with the refrigerant that has been partially cooled and condensed in the first heat exchanger 1 and the second heat exchanger 2 respectively, it enters the first heat exchange tube bundle chamber 161 of the first heat exchanger 1 through the external pipeline, and is further heated by heat exchange with the high-temperature and high-pressure refrigerant entering the first heat exchanger 1 from the compressor outlet. The water entering the first heat exchange tube bundle chamber 161 from the fourth heat exchange tube bundle 23 can cool the refrigerant in the first heat exchanger 1, so that the refrigerant and the water from the second heat exchanger 2 maintain an appropriate temperature difference, thereby ensuring the heating effect of the first heat exchanger 1.

[0095] In this embodiment, for example, as a shell-and-tube heat exchanger, no major structural changes are required to the first heat exchanger 1 and the second heat exchanger 2. Only corresponding baffles need to be installed at the ends of their respective shells and appropriate external piping can be configured, thereby simplifying the waterway layout of the heat exchanger group. In some embodiments, while ensuring that the waterway flow direction or the inlet and outlet positions remain unchanged, the number of waterway flow paths in the first heat exchange tube bundle 12 and the third heat exchange tube bundle 22 can be adjusted, and corresponding baffles can be added. This application does not limit this.

[0096] Preferably, a first water pump 31 is further provided on the external pipeline connecting the fourth accommodating chamber 264 and the first heat exchange tube bundle chamber 161. The first water pump 31 pumps the heat exchange medium in the fourth accommodating chamber 264 to the first heat exchange tube bundle chamber 161, overcoming the flow resistance caused by this portion of water flowing through the second heat exchange tube bundle 13, the fourth heat exchange tube bundle 23, and the external pipeline. This facilitates pressure balance and sufficient mixing in the first heat exchange tube bundle chamber 161 with the water from the second tube body 122, thereby ensuring the required water flow rate of the first tube body 121.

[0097] Corresponding to the second embodiment of the present application, the present application further provides an air conditioning system, comprising the heat exchanger assembly described in the second embodiment. By employing the aforementioned heat exchanger assembly, the water flowing through the first heat exchanger 1 and the second heat exchanger 2, and the high-temperature, high-pressure refrigerant entering the first heat exchanger 1 and the high-temperature, high-pressure refrigerant entering the second heat exchanger 2, respectively, maintain an appropriate temperature difference during the water flow, thereby achieving sufficient heat exchange. This, in turn, enables the refrigerant at the outlet of the second heat exchanger 2 to be reduced to a lower temperature, ensuring the refrigerant's subcooling, thereby improving the overall heating capacity and efficiency of the heat exchanger assembly and the air conditioning system.

[0098] Taking an example to illustrate the heat exchange between water and refrigerant in each heat exchanger when the inlet water temperature of the fourth heat exchange tube bundle chamber 164 of the heat exchanger group is 50°C, and the outlet water temperature of the third accommodating chamber 263 of the heat exchanger group is 70°C, the heat exchange between water and refrigerant in each heat exchanger is described.

[0099] Of the inlet water entering the heat exchanger group, part of the inlet water passes through the second heat exchange tube bundle 13 to exchange heat with the refrigerant and then flows out of the second heat exchange tube bundle chamber 162. At this time, its outlet water temperature is 51.5°C, which is 60°C lower than the overall outlet water temperature of the first condenser 100 in the prior art, that is, the inlet water temperature of the second heat exchanger 2 is significantly reduced; further, the temperature of the refrigerant flowing out of the first heat exchanger 1 is 53°C, which is roughly the same as the temperature of the refrigerant flowing out of the first condenser 100 in the prior art (53°C), that is, the structure of the heat exchanger group in the second embodiment of the present application basically does not cause large fluctuations in the refrigerant temperature of the first heat exchanger 1, thereby ensuring the operational reliability and heating effect of the heat exchanger group. Furthermore, in the present application, the temperature of the refrigerant flowing out of the second heat exchanger 2 is 54.5°C, which is slightly higher than the temperature of the refrigerant flowing out of the first heat exchanger 1, but still lower than the refrigerant temperature at the outlet of the second heat exchanger 2 in the prior art (63°C). That is, by introducing the lower temperature water in the second heat exchange tube bundle 13 into the fourth heat exchange tube bundle 23 to exchange heat with the refrigerant in the second heat exchanger 2, the refrigerant temperature in the second heat exchanger 2 can be reduced, and the subcooling degree and heating effect of the refrigerant can be improved.

[0100] On the other hand, part of the incoming water passes through the second tube body 122 of the first heat exchange tube bundle 12, exchanges heat with the refrigerant that has entered the first heat exchanger 1 and has preliminarily exchanged heat with the water in the first tube body 121 to increase its temperature, and then mixes with the water from the fourth heat exchange tube bundle 23 of the second heat exchanger 2 in the first heat exchanger bundle chamber 161, and continues to flow through the first tube body 121 and the third tube body 221 and the fourth tube body 222 of the second heat exchanger 2 to continue to exchange heat with the high-temperature and high-pressure refrigerant to increase its temperature.

[0101] As described above, in each water flow path of the first heat exchanger 1 and the second heat exchanger 2, the water as the heat exchange medium and the refrigerant always maintain an appropriate temperature difference, so that sufficient heat exchange can be achieved, and the refrigerant at the outlet of the second heat exchanger 2 can be reduced to a lower temperature, ensuring the supercooling of the refrigerant, thereby improving the overall heating capacity and heating efficiency of the heat exchanger group and the air-conditioning system.

[0102] <Third embodiment>

[0103] like Figure 4 As shown, the third embodiment of the present application provides a heat exchanger group, which has a structure basically the same as that of the heat exchanger group of the second embodiment, except that the second heat exchange tube bundle chamber 162 is connected to the fourth accommodating chamber 264 through an external pipeline, the fourth heat exchange tube bundle 23 is connected to the first heat exchanger bundle chamber 161 through the second accommodating chamber 262 through an external pipeline, the first heat exchange tube bundle chamber 161 is connected to the fifth accommodating chamber 265 through the first tube body 121 and through an external pipeline, and the fifth accommodating chamber 265 is connected to the third accommodating chamber 263 through the third heat exchange tube bundle 22.

[0104] That is, in this embodiment, the flow direction of the water channel is: the fourth heat exchange tube bundle chamber 164, the second heat exchange tube bundle 13, the second heat exchange tube bundle chamber 162, the fourth accommodating chamber 264, the fourth heat exchange tube bundle 23, the second accommodating chamber 262, the first heat exchange tube bundle chamber 161, the first tube body, the third heat exchange tube bundle chamber 163, the fifth accommodating chamber 265, the fourth tube body 222, the first accommodating chamber 261, the third tube body 221, and the third accommodating chamber 263.

[0105] Through the above method, technicians can adjust the connection position between the second heat exchange tube bundle chamber 162 and the fourth heat exchange tube bundle 23 of the second heat exchanger 2 according to actual conditions, which is highly flexible.

[0106] Furthermore, a second water pump 32 is provided on the pipeline connecting the fourth heat exchange tube bundle 23 and the first heat exchanger bundle chamber 161. The second water pump 32 pumps the heat exchange medium in the second accommodating chamber 262 to the first heat exchange tube bundle chamber 161. This overcomes the flow resistance caused by this portion of water flowing through the second heat exchange tube bundle 13, the fourth heat exchange tube bundle 23, and external pipelines. Pressure balance is achieved in the first heat exchange tube bundle chamber 161 with the water from the first tube body 122, allowing for sufficient mixing and ensuring the required water flow rate in the first tube body 121. This helps improve the heat exchange efficiency between the heat exchange medium and the refrigerant.

[0107] Corresponding to the third embodiment of the present application, the present application further provides an air conditioning system, comprising the heat exchanger assembly described in the third embodiment. By employing the aforementioned heat exchanger assembly, the water flowing through the first heat exchanger 1 and the second heat exchanger 2, and the high-temperature, high-pressure refrigerant entering the first heat exchanger 1 and the high-temperature, high-pressure refrigerant entering the second heat exchanger 2, respectively, maintain an appropriate temperature difference during the water flow, thereby achieving sufficient heat exchange and reducing the refrigerant at the outlet of the second heat exchanger 2 to a lower temperature, thereby improving the overall heating capacity and efficiency of the heat exchanger assembly and the air conditioning system.

[0108] For example, the inlet temperature of the fourth heat exchange tube bundle chamber 164 is 50° C., and the outlet temperature of the third accommodating chamber 263 is 70° C.

[0109] Among the inlet water of the heat exchanger group, part of the inlet water exchanges heat with the refrigerant through the second heat exchange tube bundle 13 and flows out of the second heat exchange tube bundle chamber 162, and its outlet water temperature is 51.5°C, which is 60°C lower than the outlet water temperature of the first condenser 100 in the prior art, that is, the inlet water temperature of part of the second heat exchanger 2 is reduced; further, the temperature of the refrigerant flowing out of the first heat exchanger 1 is 53°C, which is roughly the same as the temperature of the refrigerant flowing out of the first heat exchanger 1 in the prior art (53°C), that is, the structure of the heat exchanger group in the second embodiment of the present application basically does not cause large fluctuations in the refrigerant temperature at the outlet of the first heat exchanger 1, thereby ensuring the operational reliability and heating effect of the heat exchanger group. Furthermore, in the present application, the temperature of the refrigerant flowing out of the second heat exchanger 2 is 54.5°C, which is slightly higher than the temperature of the refrigerant flowing out of the first heat exchanger 1, but still lower than the refrigerant temperature at the outlet of the second condenser 200 in the prior art (63°C). That is, by introducing the water in the second heat exchange tube bundle 13 into the fourth heat exchange tube bundle 23 to exchange heat with the refrigerant in the second heat exchanger 2, the temperature of the refrigerant in the second heat exchanger 2 can be reduced, thereby ensuring the subcooling and heating effect of the refrigerant at the outlet of the second heat exchanger 2.

[0110] On the other hand, the flow and heat exchange of a portion of the incoming water after passing through the second tube body 122 of the first heat exchange tube bundle 12 are the same as those in the third embodiment and will not be described in detail herein.

[0111] <Fourth embodiment>

[0112] like Figure 5 As shown, this embodiment provides a heat exchanger group, which is similar in structure to the first embodiment and includes a first heat exchanger 1 and a second heat exchanger 2. The difference is that:

[0113] The first heat exchanger 1 also includes:

[0114] The fourth partition plate 18 is disposed in the first chamber 16 and divides the first chamber 16 into a third heat exchange tube bundle chamber 163 and a fourth heat exchange tube bundle chamber 164 ;

[0115] The fifth partition plate 19 divides the first heat exchange tube bundle chamber 161 into a chamber 161A and a chamber 161B, with the chamber 161A being located above the chamber 161B.

[0116] The first heat exchange tube bundle 12 is a three-pass heat exchange tube bundle, including a first tube body, a second tube body, and a third tube body arranged in parallel (from top to bottom, they are the first, second, and third tube bodies, and the up and down direction refers to the radial direction along the first shell 11). The two ends of the first tube body are respectively connected to the chamber 161A and the third heat exchange tube bundle chamber 163, the two ends of the second tube body are respectively connected to the chamber 161B and the third heat exchange tube bundle chamber 163, and the two ends of the third tube body are respectively connected to the chamber 161B and the fourth heat exchange tube bundle chamber 164.

[0117] The second heat exchanger 2 also includes:

[0118] Two third partitions 28 are provided in the second chamber 26 . The two third partitions 28 separate the second chamber 26 into a third accommodating chamber 263 communicating with the third heat exchange tube bundle 22 , a fifth accommodating chamber 265 , and a fourth accommodating chamber 264 communicating with the fourth heat exchange tube bundle 23 .

[0119] The sixth partition plate 29 is provided in the second chamber 26 and divides the first accommodating chamber 261 into an accommodating chamber 261A and an accommodating chamber 261B. The accommodating chamber 261A is adjacent to the accommodating chamber 261B.

[0120] The third heat exchange tube bundle 22 is a three-pass heat exchange tube bundle, including a fourth tube body, a fifth tube body and a sixth tube body arranged in parallel (from top to bottom, they are the fourth, fifth and sixth tube bodies respectively, and the up and down direction refers to the radial direction of the second shell 21). The two ends of the fourth tube body are respectively connected to the third accommodating chamber 263 and the accommodating chamber 261A, the two ends of the fifth tube body are respectively connected to the fifth accommodating chamber 265 and the accommodating chamber 261B, and the two ends of the sixth tube body are respectively connected to the fifth accommodating chamber 265 and the accommodating chamber 261B.

[0121] The pipe connection between the first heat exchanger 1 and the second heat exchanger 2 is as follows: the second heat exchange tube bundle chamber 162 is connected to the second accommodating chamber 262 through an external pipe, the fourth accommodating chamber 264 is connected to the chamber 161B through an external pipe, and the chamber 161A is connected to the accommodating chamber 261B through an external pipe.

[0122] The communication structure between the first heat exchanger 1 and the second heat exchanger 2 in this embodiment has been specifically described above. The water flow direction thereof will be described below.

[0123] As the inlet water of the heat exchanger group, the inlet water enters from the fourth heat exchange tube bundle chamber 164, partially flows into the first heat exchange tube bundle 12, and partially flows into the second heat exchange tube bundle 13:

[0124] The water entering the first heat exchange tube bundle 12 flows into the chamber 161B through the third tube body, then flows through the second tube body, the third heat exchange tube bundle chamber 163, the first tube body, and the chamber 161A into the chamber 261B, and then flows along the sixth tube body, the fifth accommodating chamber 265, the fifth tube body, the chamber 261A, the fourth tube body, and the third accommodating chamber 263.

[0125] The water entering the second heat exchange tube bundle 13 enters the chamber 161B through the second heat exchange tube bundle chamber 162, the second accommodating chamber 262, the fourth heat exchange tube bundle 23, and the fourth accommodating chamber 264, and then merges with the water entering the chamber 161B through the third tube body. The water then repeats the process after entering the chamber 161B, which will not be repeated here.

[0126] It should be noted that, in this embodiment, although the first heat exchange tube bundle 12 and the third heat exchange tube bundle 22 are shown as three-flow tube bundles, it is foreseeable that technicians can adjust the number of water paths of the first heat exchange tube bundle 12 and the third heat exchange tube bundle 22 as well as the number of baffles in each heat exchanger, and the relative position of the baffles and the heat exchange tube bundles according to actual needs, so that the water in the first heat exchange tube bundle 12 has corresponding inlets and outlets, and the water in the third heat exchange tube bundle 22 has corresponding inlets and outlets. After the water in the second heat exchange tube bundle 13 in the first heat exchanger 1 enters the fourth tube bundle 23 in the second heat exchanger 2, it can return to the first heat exchange tube bundle 12 and the third heat exchange tube bundle 22 for heat exchange, thereby improving the cooling effect on the refrigerant.

[0127] In addition, although this application illustrates four different implementation methods, technicians can combine them according to the solutions described in different implementation methods, and this application will not go into details.

[0128] Corresponding to the fourth embodiment of the present application, the present application further provides an air-conditioning system, including the heat exchanger group described in the fourth embodiment. By adopting the above-mentioned heat exchanger group, the water flowing through the first heat exchanger 1 and the second heat exchanger 2, and the high-temperature and high-pressure refrigerant entering the first heat exchanger 1 and the high-temperature and high-pressure refrigerant entering the second heat exchanger 2 respectively, in the water flow, the water as the heat exchange medium and the refrigerant always maintain an appropriate temperature difference, achieving sufficient heat exchange, and can reduce the refrigerant at the outlet of the second heat exchanger 2 to a lower temperature, thereby improving the overall heating capacity and heating efficiency of the heat exchanger group and the air-conditioning system. In this embodiment, the refrigerant at the outlet of the second heat exchanger 2 can also be cooled to 54.5°C, which is the same as the first, second, and third embodiments mentioned above, and will not be repeated here.

[0129] <Fifth embodiment>

[0130] like Figure 6As shown, the fifth embodiment of the present application provides a heat exchanger group, which has a structure basically the same as that of the first embodiment, except that the second heat exchanger 2 includes two second partitions 27, and the two second partitions 27 are respectively arranged in the two second chambers 26 at both ends of the second shell 21, and the second chamber 26 is divided into a first accommodating chamber 261 connected to the third heat exchange tube bundle 22 and a second accommodating chamber 262 connected to the fourth heat exchange tube bundle 23, and the outlet of the fourth heat exchange tube bundle 23 is connected to the inlet of the third heat exchange tube bundle 22 through a pipeline. Specifically, the second accommodating chamber 262 on the outlet side of the fourth heat exchange tube bundle 23 is connected to the first accommodating chamber 261 on the inlet side of the third heat exchange tube bundle 22 through a pipeline.

[0131] Through this approach, the heat exchange medium at the outlet of the fourth heat exchange tube bundle 23 can enter the third heat exchange tube bundle 22 to continue exchanging heat with the refrigerant in the second shell 21, thereby improving heat exchange efficiency and the degree of subcooling of the refrigerant at the outlet of the second heat exchanger 2. Furthermore, a third water pump 33 is provided on the pipeline connecting the outlet of the fourth heat exchange tube bundle 23 and the inlet of the third heat exchange tube bundle 22. The remaining structure and principles of the fifth embodiment are identical to those of the first embodiment and will not be further described here.

[0132] The operation of the fifth embodiment of the present application is described below by taking as an example the water inlet temperature of the first chamber 16 on the water inlet side of the first heat exchanger 1 being 50° C. and the water outlet temperature of the second chamber 26 on the water outlet side of the second heat exchanger 2 being 70° C.

[0133] The heat exchange process of the water entering the first chamber 16 and passing through the first heat exchange tube bundle 12 and the third heat exchange tube bundle 22 is similar to that in the prior art and will not be described in detail here.

[0134] The water at 50°C entering the first chamber 16 exchanges heat with the refrigerant through the second heat exchange tube bundle 13 and flows out of the second heat exchange tube bundle chamber 162. At this time, for example, the water outlet temperature is 51.5°C, which is lower than Figure 1 As shown in the prior art, the outlet water temperature of the first condenser 100 is 60°C, which significantly reduces the inlet water temperature of part of the second heat exchanger 2; further, the temperature of the refrigerant flowing out of the first heat exchanger 1 is 53°C, and the temperature of the refrigerant flowing out of the second heat exchanger 2 is 54.5°C, which are slightly higher than the temperature of the refrigerant flowing out of the first heat exchanger 1, but still lower than the refrigerant temperature (63°C) at the outlet of the second condenser 200 in the prior art, that is, by introducing the water in the second heat exchange tube bundle 13 into the fourth heat exchange tube bundle 23 to exchange heat with the refrigerant in the second heat exchanger 2, and then introducing the water at the outlet of the fourth heat exchange tube bundle 23 into the third heat exchange tube bundle 22 for heat exchange with the refrigerant in the second shell 21, the refrigerant temperature at the outlet of the second heat exchanger 2 can be reduced, and the subcooling degree and heating effect of the refrigerant at the outlet of the second heat exchanger 2 can be improved.

[0135] <Sixth embodiment>

[0136] like Figure 7 As shown, the sixth embodiment of the present application provides a heat exchanger group, including: a first heat exchanger 1, a second heat exchanger 2, a third heat exchanger 6 and a fourth heat exchanger 7, wherein:

[0137] The first heat exchanger 1 includes a first shell 11, a first refrigerant flow channel 111 and a first heat exchange tube bundle 12. The first shell 11 is provided with a first refrigerant inlet and a first refrigerant outlet. The first refrigerant flow channel 111 is formed between the first refrigerant inlet and the first refrigerant outlet (the space in the first shell 11 except the first heat exchange tube bundle 12). The first heat exchange tube bundle 12 is provided in the first shell 11.

[0138] The second heat exchanger 2 includes a second shell 21, a second refrigerant flow channel 211 and a third heat exchange tube bundle 22. The second shell 21 is provided with a second refrigerant inlet and a second refrigerant outlet; the second refrigerant flow channel 211 is formed between the second refrigerant inlet and the second refrigerant outlet (the space in the second shell 21 except the third heat exchange tube bundle 22); the third heat exchange tube bundle 22 is provided in the second shell 21, and the inlet of the third heat exchange tube bundle 22 is connected to the outlet of the first heat exchange tube bundle 12.

[0139] The third heat exchanger 6 is arranged on the outside of the first shell 11. The third heat exchanger 6 includes a third refrigerant flow channel 61 and a first heat exchange flow channel 62 arranged corresponding to the third refrigerant flow channel 61. The third refrigerant flow channel 61 is connected to the first refrigerant flow channel 111 (the inlet of the third refrigerant flow channel 61 is connected to the first refrigerant outlet); the inlet of the first heat exchange flow channel 62 is connected to the inlet of the first heat exchange tube bundle 12 and is connected to the water supply end (not shown in the figure).

[0140] The fourth heat exchanger 7 is arranged on the outside of the second shell 21. The fourth heat exchanger 7 includes a fourth refrigerant flow channel 71 and a second heat exchange flow channel 72 corresponding to the fourth refrigerant flow channel 71. The fourth refrigerant flow channel 71 is connected to the second refrigerant flow channel 211 (the inlet of the fourth refrigerant flow channel 71 is connected to the second refrigerant outlet), and the inlet of the second heat exchange flow channel 72 is connected to the outlet of the first heat exchange flow channel 62.

[0141] In this embodiment, the heat exchange medium flowing through the first heat exchange tube bundle 12, the third heat exchange tube bundle 22, the first heat exchange flow channel 62, and the second heat exchange flow channel 72 is preferably water. The following uses water as an example to illustrate the operation of the heat exchanger assembly. Of course, the heat exchange medium is not limited to water; other fluids capable of exchanging heat with the refrigerant are also suitable for this application. The third heat exchanger 6 and the fourth heat exchanger 7 can be plate heat exchangers or other types of heat exchangers.

[0142] Refrigerant flow process: When both the first heat exchanger 1 and the second heat exchanger 2 serve as condensers, the first high-temperature, high-pressure gaseous refrigerant sequentially passes through the first refrigerant inlet, the first refrigerant flow channel 111, the first refrigerant outlet, and the third refrigerant flow channel 61 for heat exchange, is condensed into liquid refrigerant, and is discharged. The second high-temperature, high-pressure gaseous refrigerant sequentially passes through the second refrigerant inlet, the second refrigerant flow channel 211, the second refrigerant outlet, and the fourth refrigerant flow channel 71 for heat exchange, is condensed into liquid refrigerant, and is discharged.

[0143] Flow process of heat exchange medium: Water as heat exchange medium is divided into two flow paths and enters the first heat exchange flow channel 62 and the first heat exchange tube bundle 12 respectively:

[0144] The water entering the first heat exchange tube bundle 12 exchanges heat with the refrigerant in the first shell 11 , then enters the third heat exchange tube bundle 22 and exchanges heat with the refrigerant in the second shell 21 before being discharged.

[0145] The water entering the first heat exchange channel 62 of the third heat exchanger 6 exchanges heat with the refrigerant entering the third refrigerant channel 61 , and then enters the second heat exchange channel 72 of the fourth heat exchanger 7 and exchanges heat with the refrigerant in the fourth refrigerant channel 71 .

[0146] In this embodiment, the refrigerant at the outlet of the first heat exchanger 1 further exchanges heat with the heat exchange medium in the third heat exchanger 6, thereby further reducing the outlet temperature of the refrigerant. The refrigerant at the outlet of the second heat exchanger 2 further exchanges heat with the relatively low-temperature heat exchange medium from the second heat exchange flow channel 72 of the fourth heat exchanger 7, similarly reducing the outlet temperature of the refrigerant in the heat exchanger group.

[0147] Specifically, because the high-temperature, high-pressure refrigerant exchanges heat with the first heat exchange tube bundle 12 and the first heat exchange channel 62 sequentially from the first refrigerant inlet, the heat exchange medium in the first heat exchange tube bundle 12 absorbs the heat of the high-temperature, high-pressure gaseous refrigerant and reaches a relatively high temperature. However, after the high-temperature, high-pressure gaseous refrigerant exchanges heat with the first heat exchange tube bundle 12, most or all of the gaseous refrigerant is condensed into liquid. The condensed liquid refrigerant further exchanges heat with the water flowing in the first heat exchange channel 62, further reducing the temperature of the liquid refrigerant after heat exchange with the first heat exchange channel 62. The heat exchange medium in the first heat exchange channel 62 absorbs the heat of the refrigerant after passing through the first heat exchange tube bundle 12, and its temperature remains relatively low (compared to the case where the first heat exchange tube bundle 12 directly exchanges heat with the high-temperature gaseous refrigerant). That is, when the first heat exchange tube bundle 12 and the first heat exchange channel 62 are configured substantially the same, the temperature rise of the heat exchange medium in the first heat exchange tube bundle 12 is higher than the temperature rise of the heat exchange medium in the first heat exchange channel 62. Similarly, when the third heat exchange tube bundle 22 and the second heat exchange channel 72 are configured substantially the same, the temperature rise of the heat exchange medium in the third heat exchange tube bundle 22 is higher than the temperature rise of the heat exchange medium in the second heat exchange channel 72 .

[0148] Compared with the prior art, after the heat exchange medium exchanges heat with the refrigerant in the first condenser 100, it all enters the second heat exchanger 200 and exchanges heat with the refrigerant in the second condenser 200, resulting in a smaller temperature difference between the heat exchange medium and the refrigerant in the second condenser 200, a smaller degree of subcooling at the condenser outlet of the second condenser 200, and a poor heat exchange effect.

[0149] The present application utilizes the fact that, in the flow direction of the refrigerant, the heat exchange medium in the downstream first heat exchange channel 62 has a lower temperature than the heat exchange medium in the upstream first heat exchange tube bundle 12, and the heat exchange medium in the downstream second heat exchange channel 72 has a lower temperature than the heat exchange medium in the upstream third heat exchange tube bundle 22. In addition, by connecting the first heat exchange channel 62 with the second heat exchange channel 72 of the fourth heat exchanger 7, and connecting the inlet of the first heat exchange channel 62 of the third heat exchanger 6 with the water supply end, the heat exchange medium entering the first heat exchange channel 62 and the fourth heat exchanger 6 is reduced. The inlet temperature of the heat exchange medium in the second heat exchange channel 72 of the heat exchanger 7 increases the temperature difference between the heat exchange medium in the first heat exchange channel 62 and the second heat exchange channel 72 and the corresponding refrigerant, thereby improving the heat exchange effect, so that the refrigerant temperature at the outlet of the third heat exchanger 6 is lower than the refrigerant temperature at the outlet of the first heat exchanger 1, and the refrigerant temperature at the outlet of the fourth heat exchanger 7 is lower than the refrigerant temperature at the outlet of the second heat exchanger 2. The refrigerant at the final outlet of the heat exchanger group has a greater degree of subcooling, which is beneficial to improving the overall heating efficiency and heating capacity of the heat exchanger group.

[0150] It should be noted that the attached Figures 1 to 7 The refrigerant inlet and refrigerant outlet indicated in the figure are for reference only, indicating that refrigerant is entering and refrigerant is flowing out, and do not indicate the actual positions of the first refrigerant inlet, the first refrigerant outlet, the second refrigerant inlet, and the second refrigerant outlet; preferably, as Figures 1 to 7 In the direction shown, in the first heat exchanger 1, the refrigerant enters from the top of the first shell 11 and flows out from the bottom of the first shell 11. In the second heat exchanger 2, the refrigerant enters from the top of the second shell 21 and flows out from the bottom of the second shell 21. The top and bottom here can be the top and bottom of the corresponding shell in the radial direction.

[0151] In the present application, the ratio of the flow rate of the heat exchange medium flowing through the first heat exchange flow channel 62 to the flow rate of the heat exchange medium flowing through the first heat exchange tube bundle 12 is not particularly limited and can be appropriately adjusted according to the capacity load of the heat exchanger.

[0152] However, as a preferred solution, the flow rate of the heat exchange medium flowing through the first heat exchange channel 62 can be less than the flow rate of the heat exchange medium in the first heat exchange tube bundle 12, and the flow rate of the heat exchange medium flowing through the third heat exchange tube bundle 22 is greater than the flow rate of the heat exchange medium in the second heat exchange channel 72 (for example, the amount of water flowing through the first heat exchange tube bundle 12 and the third heat exchange tube bundle 22 is 90%, and the amount of water flowing through the first heat exchange channel 62 and the second heat exchange channel 72 is 10%).

[0153] As a preferred example in the embodiments of the present application, in the aforementioned series-arranged heat exchanger group, the first heat exchange tube bundle 12, the first heat exchange flow channel 62, the third heat exchange tube bundle 22, and the second heat exchange flow channel 72 can all be single-pass heat exchange tube bundles. Single-pass heat exchange tube bundles have the advantage of high flow rates. Technicians can select heat exchange tube bundles of different flows based on actual needs, ensuring that the connections between the different heat exchange tube bundles follow the aforementioned connection relationship. This embodiment does not impose any limitations on this.

[0154] Preferably, a fourth water pump 34 is provided on the pipeline connecting the first heat exchange channel 62 and the second heat exchange channel 72. The setting of the fourth water pump 34 can pump the heat exchange medium in the first heat exchange channel 62 to the second heat exchange channel 72, overcoming the flow resistance of the heat exchange medium and helping to improve the heat exchange efficiency.

[0155] Preferably, the outlet of the second heat exchange channel 72 is connected to the inlet of the third heat exchange tube bundle 22 via a pipeline. This allows the heat exchange medium at the outlet of the second heat exchange channel 72 to enter the third heat exchange tube bundle 22 and continue to exchange heat with the refrigerant in the second refrigerant channel 211, thereby improving heat exchange efficiency and the degree of subcooling of the refrigerant at the outlet of the second heat exchanger 2. Furthermore, a fifth water pump (not shown) is provided on the pipeline connecting the outlet of the second heat exchange channel 72 and the inlet of the third heat exchange tube bundle 22. The provision of the fifth water pump can pump the heat exchange medium in the second heat exchange channel 72 to the third heat exchange tube bundle 22, overcoming the flow resistance of the heat exchange medium and facilitating improved heat exchange efficiency.

[0156] Another aspect of the present application provides an air conditioning system including the aforementioned heat exchanger assembly as a condenser. By employing the aforementioned heat exchanger assembly as the condenser, the refrigerant outlet temperature of the heat exchanger assembly can be lowered to a lower temperature under the same operating conditions as the air conditioning system's compressor assembly (same refrigerant temperature and pressure at the compressor assembly outlet), thereby improving the overall heating capacity and efficiency of the heat exchanger assembly and the air conditioning system.

[0157] The operation process of the above embodiment of the present application is described below by taking the water inlet temperature of the first heat exchanger 1 and the third heat exchanger 6 as 50°C and the water outlet temperature of the second heat exchanger 2 as 70°C as an example.

[0158] The outlet temperature of the heat exchange medium in the first heat exchange tube bundle 12 after heat exchange with the refrigerant in the first refrigerant flow channel 111 is 60°C. The outlet temperature of the heat exchange medium at 60°C after entering the second heat exchanger 2 for further heat exchange is 70°C.

[0159] The refrigerant at the outlet of the first heat exchanger 1 enters the third refrigerant flow channel 61 of the third heat exchanger 6, and after exchanging heat with the heat exchange medium in the first heat exchange flow channel 62, the outlet temperature of the refrigerant is 53°C.

[0160] The refrigerant at the outlet of the second heat exchanger 2 enters the fourth refrigerant flow channel 71 of the fourth heat exchanger 7 and exchanges heat with the heat exchange medium in the second heat exchange flow channel 72. The outlet temperature of the refrigerant is 56°C. Figure 1 The refrigerant temperature (63°C) at the outlet of the second condenser 200 in the prior art shown, that is, by introducing water with a relatively low temperature in the first heat exchange channel 62 into the second heat exchange channel 72 to exchange heat with the refrigerant in the second heat exchanger 2, can reduce the refrigerant temperature at the final outlet of the heat exchanger group, and improve the subcooling degree and heating effect of the refrigerant at the final outlet of the heat exchanger group.

[0161] In some embodiments, the air conditioning system may be a series counter-flow chiller. It should be noted that this application does not limit other structures and connection relationships of the air conditioning system, as long as it can form a complete refrigerant circulation loop.

[0162] It should be noted that, in this application, "first," "second," "third," "fourth," etc., may be used to describe various components, but these components should not be limited by these terms. These terms are simply used to distinguish one component from another. For example, a first component can be designated as a second component, and similarly, a second component can be designated as a first component.

[0163] The above is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A heat exchanger assembly, characterized in that: include: The first heat exchanger comprises: a first shell having a first refrigerant inlet and a first refrigerant outlet; a first refrigerant flow channel formed between the first refrigerant inlet and the first refrigerant outlet; a first heat exchange tube bundle, disposed in the first shell; The second heat exchanger comprises: The second shell is provided with a second refrigerant inlet and a second refrigerant outlet; a second refrigerant flow channel formed between the second refrigerant inlet and the second refrigerant outlet; a third heat exchange tube bundle, disposed in the second shell, wherein the inlet of the third heat exchange tube bundle is connected to the outlet of the first heat exchange tube bundle; The third heat exchanger comprises: a third refrigerant flow channel, communicating with the first refrigerant flow channel; A first heat exchange flow channel is provided corresponding to the third refrigerant flow channel; The fourth heat exchanger comprises: a fourth refrigerant flow channel, communicating with the second refrigerant flow channel, The second heat exchange channel is provided corresponding to the fourth refrigerant channel, and the inlet is communicated with the outlet of the first heat exchange channel.

2. The heat exchanger assembly according to claim 1, characterized in that The third heat exchanger is disposed in the first shell. The first heat exchange flow channel is a second heat exchange tube bundle disposed in the first shell. The second heat exchange tube bundle is disposed closer to the first refrigerant outlet than the first heat exchange tube bundle. The third refrigerant flow channel and the first refrigerant flow channel together constitute an empty space inside the first shell. The fourth heat exchanger is arranged in the second shell, and the second heat exchange flow channel is a fourth heat exchange tube bundle arranged in the second shell. The fourth heat exchange tube bundle is arranged closer to the second refrigerant outlet than the third heat exchange tube bundle; the fourth refrigerant flow channel and the second refrigerant flow channel together constitute the empty space inside the second shell.

3. The heat exchanger assembly according to claim 2, characterized in that: The first heat exchanger further includes, The first shell tube sheets are respectively arranged at both ends of the first shell to fix the first heat exchange tube bundle and the second heat exchange tube bundle. first heat exchanger end covers respectively provided at both ends of the first shell, The first shell tube sheet is arranged corresponding to the first heat exchanger end cover and is surrounded by the first heat exchanger end cover to form a first chamber. At least one first partition is provided in the first chamber to divide the first chamber into a first heat exchange tube bundle chamber communicating with the first heat exchange tube bundle and a second heat exchange tube bundle chamber communicating with the second heat exchange tube bundle.

4. The heat exchanger assembly according to claim 3, characterized in that The second heat exchanger further includes, The second shell tube sheets are respectively arranged at both ends of the second shell to fix the third heat exchange tube bundle and the fourth heat exchange tube bundle. Second heat exchanger end covers are respectively provided at both ends of the second shell, The second shell tube sheet is arranged corresponding to the second heat exchanger end cover and is surrounded by the second heat exchanger end cover to form a second chamber. At least one second partition is provided in the second chamber to separate the second chamber into a first accommodating chamber communicating with the third heat exchange tube bundle and a second accommodating chamber communicating with the fourth heat exchange tube bundle.

5. The heat exchanger assembly according to claim 4, characterized in that: The second heat exchanger further includes, Two third partitions are arranged in the second chamber to divide the second chamber into a third accommodating chamber connected to the third heat exchange tube bundle, a fourth accommodating chamber connected to the fourth heat exchange tube, and a fifth accommodating chamber between the third accommodating chamber and the fourth accommodating chamber.

6. The heat exchanger assembly according to claim 5, characterized in that The fourth accommodating chamber is connected to the first heat exchange tube bundle chamber through a pipeline. The first heat exchange tube bundle chamber is connected to the fifth accommodating chamber through a pipeline. The fifth accommodating chamber is communicated with the third accommodating chamber through the third heat exchange tube bundle.

7. The heat exchanger assembly according to claim 6, characterized in that A first water pump is further provided on the pipeline connecting the fourth accommodating chamber and the first heat exchange tube bundle chamber.

8. The heat exchanger assembly according to claim 5, characterized in that The second heat exchange tube bundle chamber is connected to the fifth accommodating chamber through a pipeline. The fourth heat exchange tube bundle is connected to the first heat exchanger bundle chamber through a pipeline, The first heat exchange tube bundle chamber is connected to the fifth accommodating chamber through a pipeline. The fifth accommodating chamber is communicated with the third accommodating chamber through the third heat exchange tube bundle.

9. The heat exchanger assembly according to claim 8, characterized in that A second water pump is further provided on the pipeline connecting the fourth heat exchange tube bundle and the first heat exchanger bundle chamber.

10. The heat exchanger assembly according to any one of claims 1 to 8, characterized in that The first heat exchanger and the second heat exchanger are both condensers.

11. The heat exchanger assembly according to claim 2, characterized in that: The outlet of the fourth heat exchange tube bundle is connected to the inlet of the third heat exchange tube bundle through a pipeline.

12. The heat exchanger assembly according to claim 11, characterized in that A third water pump is provided on a pipeline connecting the outlet of the fourth heat exchange tube bundle and the inlet of the third heat exchange tube bundle.

13. The heat exchanger assembly according to claim 1, characterized in that The third heat exchanger is provided on the outside of the first shell, and the inlet of the third refrigerant flow channel is connected to the first refrigerant outlet; The fourth heat exchanger is disposed outside the second shell, and the inlet of the fourth refrigerant flow channel is communicated with the second refrigerant outlet.

14. The heat exchanger assembly according to claim 13, characterized in that A fourth water pump is provided on the pipeline communicating between the first heat exchange channel and the second heat exchange channel.

15. The heat exchanger assembly according to claim 13, characterized in that The outlet of the second heat exchange channel is connected to the inlet of the third heat exchange tube bundle through a pipeline.

16. The heat exchanger assembly according to claim 15, characterized in that A fifth water pump is provided on a pipeline connecting the outlet of the second heat exchange channel and the inlet of the third heat exchange tube bundle.

17. An air conditioning system, characterized in that: The heat exchanger assembly according to any one of claims 1 to 16 is included as a condenser.

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