Heat exchanger and air conditioner indoor unit

Abstract

The utility model provides a heat exchanger and an air conditioner indoor unit, the heat exchanger comprises a distributor and a plurality of flow paths, the distributor is provided with a plurality of distribution openings, and refrigeration liquid inlets of the flow paths communicate with the distribution openings in a one-to-one correspondence mode; the at least two flow paths are located at different height positions, and the distribution opening connected with the refrigerating liquid inlet of the flow path located at the high position is lower than the distribution opening connected with the refrigerating liquid inlet of the flow path located at the low position. According to flow paths located at different heights, the distribution ports with the height difference are arranged to communicate with the flow paths, flow is compensated for the flow paths located at the relatively high positions, the flow difference caused by the gravity factor is reduced, and the heat exchange performance of the heat exchanger is improved.

Description

Technical Field

[0001] This application relates to the field of air conditioning technology, and in particular to a heat exchanger and an indoor unit of an air conditioner. Background Technology

[0002] Air conditioners use distributors to distribute refrigerant into different flow paths on the heat exchanger. When the distributor is distributing the refrigerant, gravity can cause uneven refrigerant flow distribution, which leads to reduced heat exchanger performance and needs to be improved. Utility Model Content

[0003] This utility model provides a heat exchanger and an indoor air conditioning unit to solve the technical problem of uneven refrigerant distribution in the heat exchanger.

[0004] To achieve the above objectives, this application proposes a heat exchanger, including a distributor and multiple flow paths. The distributor is provided with multiple distribution ports, and the cooling liquid inlets of the multiple flow paths are connected to the multiple distribution ports one by one.

[0005] At least two of the flow paths are located at different heights, with the distribution port connected to the cooling liquid inlet of the flow path located at the higher height, and lower than the distribution port connected to the cooling liquid inlet of the flow path located at the lower height.

[0006] Optionally, in one embodiment, the two ends of the flow path are provided with a connected cooling liquid inlet and a cooling gas outlet, and at least one of the cooling liquid inlets of the flow path is located above the cooling gas outlet.

[0007] Optionally, in one embodiment, the cooling liquid inlet and the cooling gas outlet of any two adjacent flow paths are staggered.

[0008] Optionally, in one embodiment, the heat exchanger includes a plurality of heat exchange plates, the plurality of flow paths are respectively disposed on the plurality of heat exchange plates, the plurality of heat exchange plates are connected by being bent in sequence to form a cavity for accommodating a cross-flow fan, the refrigeration liquid inlets of the plurality of flow paths are respectively disposed on the side of the corresponding heat exchange plate close to the cavity, and the refrigeration air outlets of the plurality of flow paths are respectively disposed on the side of the corresponding heat exchange plate away from the cavity.

[0009] Optionally, in one embodiment, at least two of the flow paths are unique flow paths, and any heat exchange plate is provided with at least one unique flow path. The unique flow path includes a plurality of sub-flow channels connected in sequence. The plurality of sub-flow channels are arranged in sequence along the direction away from the cavity. The cooling liquid inlet of the unique flow path is connected to the sub-flow channel that is furthest away from the cavity, and the cooling gas outlet of the unique flow path is connected to the sub-flow channel that is closest to the cavity.

[0010] Optionally, in one embodiment, the plurality of heat exchange plates includes a first heat exchange plate, a second heat exchange plate, and a third heat exchange plate connected by being bent in sequence; the second heat exchange plate and the third heat exchange plate are both located above the first heat exchange plate; the included angle between the first heat exchange plate and the second heat exchange plate is an obtuse angle, and the included angle between the second heat exchange plate and the third heat exchange plate is an acute angle, the included angle being located on the side of the plurality of heat exchange plates facing the cavity.

[0011] Optionally, in one embodiment, at least one of the flow paths is a common flow path, which includes two sequentially connected flow segments, which are respectively formed on two adjacent heat exchange plates, and the refrigeration liquid inlet and the refrigeration gas outlet of the common flow path are located on the same horizontal plane.

[0012] Optionally, in one embodiment, the cooling liquid inlet and cooling gas outlet of the common flow path are located on the second heat exchange plate and the third heat exchange plate, respectively.

[0013] Optionally, in one embodiment, the flow path includes a plurality of straight pipes and a plurality of bends that are alternately connected in sequence, and at least two flow paths have the same number of bends; and / or, at least two bends are provided between the refrigeration liquid inlet and the refrigeration gas outlet of the flow path.

[0014] This application also proposes an indoor air conditioning unit, including a heat exchanger as described above, wherein a non-azeotropic refrigerant mixture flows through the flow path.

[0015] The heat exchanger provided in this application has distribution ports with different heights connected to flow paths located at different heights to compensate for the flow rate to the flow path located at a relatively higher position, reduce the flow rate difference caused by gravity, and improve the heat exchange performance of the heat exchanger. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the overall structure of the heat exchanger in this application;

[0018] Figure 2 This is a schematic diagram of the structure of the heat exchange plate and distributor in the heat exchanger of this application;

[0019] Figure 3 This is a schematic diagram of the structure of multiple heat exchange plates in the heat exchanger of this application;

[0020] Figure 4 This is a side view of multiple heat exchange plates in the heat exchanger of this application;

[0021] Figure 5 This is a schematic diagram of the first flow path, second flow path, third flow path, and fourth flow path of this application;

[0022] Figure 6 This is the heat exchanger structure used in the air conditioner in Comparative Example 1 of this application.

[0023] Description of Figure Numbers:

[0024] 1. First heat exchange plate; 11. First flow path; 2. Second heat exchange plate; 21. Second flow path; 3. Third heat exchange plate; 31. Third flow path; 4. Distributor; 41. First liquid inlet branch pipe; 42. Second liquid inlet branch pipe; 43. Third liquid inlet branch pipe; 44. Fourth liquid inlet branch pipe; 45. Distribution port; 5. Refrigeration liquid inlet; 6. Refrigeration gas outlet; 7. Fourth flow path; 71. Flow section; 8. Straight pipe; 9. Bend pipe; 10. Gas outlet pipe assembly; 101. First gas outlet branch pipe; 102. Second gas outlet branch pipe; 103. Third gas outlet branch pipe; 104. Fourth gas outlet branch pipe.

[0025] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model. In addition, it should be understood that the specific embodiments described herein are only for illustration and explanation of the present utility model and are not intended to limit the present utility model. In the present utility model, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0027] This application provides a heat exchanger to solve the problem of uneven refrigerant distribution in heat exchangers. The following description will be provided in conjunction with the accompanying drawings.

[0028] In the embodiments of this application, such as Figure 1 and Figure 2 As shown, the heat exchanger includes a distributor 4 and multiple flow paths. The distributor 4 is provided with multiple distribution ports 45, and the cooling liquid inlets 5 of the multiple flow paths are connected to the multiple distribution ports 45 one by one.

[0029] At least two flow paths are located at different heights, with the distribution port 45 connected to the cooling liquid inlet 5 of the flow path at the higher position and the distribution port 45 connected to the cooling liquid inlet 5 of the flow path at the lower position.

[0030] It should be noted that "at least two flow paths are located at different heights, and the distribution port 45 connected to the cooling liquid inlet 5 of the flow path at the higher height is lower than the distribution port 45 connected to the cooling liquid inlet 5 of the flow path at the lower height" means that at least two of the multiple distribution ports 45 of the distributor 4 are located at different heights, and the cooling liquid inlets 5 of the two flow paths at different heights are also located at different heights. The relatively higher distribution port 45 is connected to the relatively lower cooling liquid inlet 5, and the relatively lower distribution port 45 is connected to the relatively higher cooling liquid inlet 5. "Relatively higher" and "relatively lower" refer to comparisons between distribution ports 45 or between cooling liquid inlets 5.

[0031] It is understandable that the refrigerant inlet 5 located at different heights of the flow path is connected to the distribution port 45 located at different heights. By utilizing the height difference between the relatively higher distribution port 45 and the relatively lower refrigerant inlet 5, the refrigerant flow rate is increased, the flow rate of the relatively lower flow path is compensated, the flow rate difference caused by the different height distribution ports 45 is reduced, and the heat exchanger heat exchange performance is improved.

[0032] In some embodiments, as Figure 3 As shown, the two ends of the flow path are provided with a connected cooling liquid inlet 5 and a cooling gas outlet 6, and at least one cooling liquid inlet 5 of the flow path is located above the cooling gas outlet 6.

[0033] It should be noted that "at least one refrigerant inlet 5 of a flow path is located above the refrigerant outlet 6" means that there is a vertical distance between the refrigerant inlets 5 and the refrigerant outlets 6 at both ends of a flow path. This results in a bottom-in, top-out flow of the refrigerant within the flow path. This means that the refrigerant temperature at the refrigerant inlet 5 is lower than that at the refrigerant outlet 6, which is more conducive to condensation of condensate at a relatively lower position and subsequent drainage. Condensate is less likely to be blown outside the air conditioner by the cross-flow fan, ensuring a better user experience. Furthermore, each flow path has both refrigerant inlets 5 and refrigerant outlets 6 at its ends, ensuring that the number of refrigerant inlets 5 and refrigerant outlets 6 is equal, which effectively reduces refrigerant pressure loss.

[0034] In some embodiments, as Figure 3 As shown, the refrigeration liquid inlet 5 and refrigeration gas outlet 6 of any two adjacent flow paths are staggered.

[0035] It should be noted that staggered arrangement means that they are not adjacent. In this embodiment, for two adjacent flow paths, the cooling liquid inlet 5 of one flow path and the cooling gas outlet 6 of the other flow path are staggered in both the horizontal and vertical directions.

[0036] Understandably, staggered configuration can reduce the influence of refrigerant temperature between the refrigerant inlet 5 of one flow path and the refrigerant outlet 6 of another flow path, increase the heat exchange temperature difference of the flow paths, and improve the heat exchange effect.

[0037] In some embodiments, as Figure 3 As shown, the heat exchanger includes multiple heat exchange plates, multiple flow paths are respectively arranged on the multiple heat exchange plates, and the multiple heat exchange plates are connected by bending in sequence to form a cavity for accommodating the cross-flow fan. The refrigeration liquid inlets 5 of the multiple flow paths are respectively arranged on the side of the corresponding heat exchange plate close to the cavity, and the refrigeration air outlets 6 of the multiple flow paths are respectively arranged on the side of the corresponding heat exchange plate away from the cavity.

[0038] It should be noted that connecting multiple heat exchange plates by bending them sequentially means that there is an included angle between the multiple heat exchange plates, which can reduce the length of the heat exchanger in a certain direction.

[0039] Understandably, the return air vent on the indoor unit of the air conditioner is located outside the heat exchanger. Indoor air comes into contact with the heat exchanger through the return air vent for heat exchange, and the resulting cool air is blown out through the outlet of the cross-flow fan. By placing the refrigerant inlet 5 close to the cavity and the refrigerant outlet 6 away from the cavity, the refrigerant temperature gradually decreases along the return air direction of the indoor air, thereby improving cooling efficiency.

[0040] In some embodiments, as Figure 4 and Figure 5 As shown, at least two flow paths are unique flow paths. Any heat exchange plate is provided with at least one unique flow path. The unique flow path includes multiple sub-flow channels connected in sequence. The multiple sub-flow channels are arranged in sequence along the direction away from the cavity. The refrigeration liquid inlet 5 of the unique flow path is connected to the sub-flow channel closest to the cavity, and the refrigeration gas outlet 6 of the unique flow path is connected to the sub-flow channel furthest from the cavity.

[0041] It should be noted that the sub-channel furthest from the cavity refers to the sub-channel in each unique flow path that is furthest from the cavity; the sub-channel closest to the cavity refers to the sub-channel in each unique flow path that is closest to the cavity.

[0042] Understandably, on the one hand, the refrigerant inlet 5 and the refrigerant outlet 6 of each flow path are not adjacent, which reduces the influence of refrigerant temperature between the refrigerant inlet 5 and the refrigerant outlet 6, increases the heat exchange temperature difference of each flow path, and improves the heat exchange effect; on the other hand, the refrigerant flows into the unique flow path from the side closer to the cavity and flows out of the unique flow path from the side farther from the cavity, so that the refrigerant temperature gradually decreases along the return air direction of the indoor air, thereby improving the cooling efficiency.

[0043] In some embodiments, as Figure 4 As shown, the multiple heat exchange plates include a first heat exchange plate 1, a second heat exchange plate 2, and a third heat exchange plate 3 connected by bending in sequence; the second heat exchange plate 2 and the third heat exchange plate 3 are both located above the first heat exchange plate 1; the included angle between the first heat exchange plate 1 and the second heat exchange plate 2 is an obtuse angle, and the included angle between the second heat exchange plate 2 and the third heat exchange plate 3 is an acute angle, and the included angle is located on the side of the multiple heat exchange plates facing the cavity.

[0044] It is understandable that the second heat exchange plate 2 and the third heat exchange plate 3 can be arranged vertically or at the same height. The volumes of the first heat exchange plate 1, the second heat exchange plate 2, and the third heat exchange plate 3 can be the same or different.

[0045] For example, the included angle between the first heat exchange plate 1 and the second heat exchange plate 2 is 135° to 155°, and the included angle between the second heat exchange plate 2 and the third heat exchange plate 3 is 65° to 85°.

[0046] In some embodiments, as Figure 5 As shown, at least one flow path is a common flow path, which includes two sequentially connected flow sections 71. The two flow sections 71 are respectively formed on two adjacent heat exchange plates. The refrigeration liquid inlet 5 and the refrigeration gas outlet 6 of the common flow path are located on the same horizontal plane.

[0047] It is understandable that the two flow sections of a common flow path refer to structures formed on different heat exchange plates, unlike the sub-channels in a unique flow path. For different types of refrigerants, it is necessary to increase the number of flow paths to reduce refrigerant pressure loss. Without changing the number of heat exchange plates, different parts of the flow path can be placed on different heat exchange plates to increase the number of flow paths and reduce refrigerant pressure loss. By setting the refrigerant liquid inlet 5 and the refrigerant gas outlet 6 of the common flow path at the same horizontal plane, compared to setting the refrigerant liquid inlet 5 higher than the refrigerant gas outlet 6, the time the refrigerant spends flowing through the common flow path can be extended, allowing the refrigerant to fully exchange heat with the return air within the common flow path before flowing out, thus improving refrigeration efficiency.

[0048] For example, two flow segments 71 with a common flow path are formed on the second heat exchange plate 2 and the third heat exchange plate 3, respectively.

[0049] In some embodiments, as Figure 4 and Figure 5 As shown, the refrigeration liquid inlet 5 and refrigeration gas outlet 6, which share a common flow path, are located on the second heat exchange plate 2 and the third heat exchange plate 3, respectively.

[0050] Understandably, within the limited space, by placing the refrigeration liquid inlet 5 and the refrigeration gas outlet 6 on different heat exchange plates, not only can the length of the common flow path be guaranteed, but the distance between the refrigeration liquid inlet 5 and the refrigeration gas outlet 6 in the common flow path can also be increased, thereby reducing the temperature influence between the refrigeration liquid inlet 5 and the refrigeration gas outlet 6 and ensuring the heat exchange temperature difference.

[0051] For example, the multiple flow paths are a first flow path 11, a second flow path 21, a third flow path 31, and a fourth flow path 7. The first heat exchange plate 1 is provided with the first flow path 11, the second heat exchange plate 2 is provided with the second flow path 21, and the third heat exchange plate 3 is provided with the third flow path 31. The first flow path 11, the second flow path 21, and the third flow path 31 are all unique flow paths. The fourth flow path 7 is a common flow path. One flow segment 71 of the common flow path is located at the end of the second heat exchange plate 2 near the third heat exchange plate 3, and the other flow segment 71 is located at the end of the third heat exchange plate 3 near the second heat exchange plate 2. The cooling liquid inlet 5 of the fourth flow path 7 is located on the side of the third heat exchange plate 3 near the cavity, and the cooling gas outlet 6 of the fourth flow path 7 is located on the side of the second heat exchange plate 2 away from the cavity.

[0052] In some embodiments, as Figure 3 As shown, the flow path includes a plurality of straight pipes 8 and a plurality of bends 9 connected alternately in sequence, and at least two flow paths have the same number of bends 9; and / or, at least two bends 9 are provided between the refrigeration liquid inlet 5 and the refrigeration gas outlet 6 of the flow path.

[0053] It should be noted that the bend 9 is used to change the flow direction of the refrigerant on the heat exchange plate, so that the indoor return air can come into more full contact with the refrigerant.

[0054] It is understandable that having the same number of bends 9 in at least two flow paths can make the refrigerant heat exchange as similar as possible in different flow paths.

[0055] Furthermore, the first flow path 11 corresponds to the first straight pipe and the first bend, the second flow path corresponds to the second straight pipe and the second bend, and the third flow path corresponds to the third straight pipe and the third bend; the number and length of the first straight pipe, the second straight pipe and the third straight pipe are equal, the number and length of the first bend, the second bend and the third bend are equal, and the refrigerant travels the same distance through the first flow path 11, the second flow path 21 and the third flow path 31.

[0056] Taking the first flow path 11 as an example, the first flow path 11 includes an even number of first straight pipes. Half of the first straight pipes are located on the side of the first heat exchange plate 1 near the cavity, and the other half are located on the side of the first heat exchange plate 1 away from the cavity. Along the direction away from the cavity, the multiple first straight pipes are staggered. A first bend connects two first straight pipes. The first straight pipe on the side near the cavity and located at the top is connected to the first straight pipe on the side away from the cavity and located at the bottom via a first bend. It can be understood that the refrigerant flows in an S-shape on both the side near the cavity and the side away from the cavity. The second and third flow paths are set up in the same manner as the first flow path 11. For the second flow path 21, the position of the second straight pipe is... Figure 3 The first straight pipe is positioned in the same location as the second bend pipe. Figure 3 The location of the first bend in the middle is the same. For the third flow path 31, the location of the third straight pipe is the same as... Figure 3 The location of the first straight pipe is the same as the location of the third bend pipe. Figure 3 The first bend in the middle is positioned in the same location.

[0057] Furthermore, corresponding to the fourth flow path 7 are the fourth straight pipe and the fourth bend, the number of which is equal to that of the first straight pipe and the first bend, and the length of the fourth straight pipe is equal to that of the first straight pipe. Among them, the fourth straight pipe and the fourth bend located on the second heat exchange plate 2 form one section of the common flow path, and the fourth straight pipe and the fourth bend located on the third heat exchange plate 3 form the other section of the common flow path.

[0058] In some specific embodiments, such as Figure 2 As shown, the distributor 4 is provided with a first liquid inlet branch pipe 41, a second liquid inlet branch pipe 42, a third liquid inlet branch pipe 43 and a fourth liquid inlet branch pipe 44, and multiple distribution ports 45 are respectively the first distribution port, the second distribution port, the third distribution port and the fourth distribution port;

[0059] The first liquid inlet branch pipe 41 is connected between the first distribution port and the cooling liquid inlet 5 of the first flow path 11; the second liquid inlet branch pipe 42 is connected between the second distribution port and the cooling liquid inlet 5 of the second flow path 21; the third liquid inlet branch pipe 43 is connected between the third distribution port and the cooling liquid inlet 5 of the third flow path 31; and the fourth liquid inlet branch pipe 44 is connected between the fourth distribution port and the cooling liquid inlet 5 of the fourth flow path 7.

[0060] The first distribution port is higher than the third distribution port, and the cooling liquid inlet 5 of the first flow path 11 is lower than the cooling liquid inlet 5 of the third flow path 31.

[0061] In some embodiments, as Figure 1As shown, the heat exchanger also includes an outlet pipe assembly 10, which includes a first outlet branch pipe 101, a second outlet branch pipe 102, a third outlet branch pipe 103, and a fourth outlet branch pipe 104.

[0062] The first outlet branch pipe 101 is connected between the first distribution port and the cooling outlet 6 of the first flow path 11; the second outlet branch pipe 102 is connected between the second distribution port and the cooling outlet 6 of the second flow path 21; the third outlet branch pipe 103 is connected between the third distribution port and the cooling outlet 6 of the third flow path 31; and the fourth outlet branch pipe 104 is connected between the fourth distribution port and the cooling outlet 6 of the fourth flow path 7.

[0063] This application also provides an indoor air conditioning unit, which includes the aforementioned heat exchanger. The specific structure of the heat exchanger is as described in the above embodiments. Since this indoor air conditioning unit adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be elaborated here. A non-azeotropic refrigerant mixture flows within the flow path.

[0064] It should be noted that a non-azeotropic refrigerant mixture refers to a mixture of two or more different refrigerants in any proportion. For example, in the embodiments of this application, the non-azeotropic refrigerant mixture is composed of ethane (R170) and propylene (R1270), wherein the mass percentage of ethane is 13% and the mass percentage of propylene is 87%. This refrigerant has a large temperature glide, and applying it to the heat exchanger of this application can effectively exert its cooling effect and reduce the pressure loss of the refrigerant.

[0065] Air Conditioner Performance Test:

[0066] The embodiments provided in this application are as follows: Figure 5 The heat exchanger shown is the air conditioning heat exchanger of Example 1. Figure 6 The heat exchanger shown is used as an air conditioning heat exchanger in Comparative Example 1. The tests for Example 1 and Comparative Example 1 were performed as shown in Table 1 below, and the results are shown in Table 1:

[0067] Table 1

[0068]

[0069]

[0070] In this application, the heat exchanger used in Example 1 and the heat exchanger used in Comparative Example 1 are both filled with 370g of refrigerant. The refrigerant is a combination of ethane (R170) and propylene (R1270), wherein the mass percentage of ethane is 13% and the mass percentage of propylene is 87%.

[0071] APF stands for Annual Energy Performance Rate, which is the ratio of the total amount of cooling removed from indoor air and the total amount of heat delivered into the room during the cooling and heating seasons to the total amount of electricity consumed during the same period. A higher APF value indicates better energy efficiency of the air conditioner.

[0072] The test conditions for the test points are shown in Table 2:

[0073] Table 2

[0074] Test Point Indoor dry bulb temperature Indoor wet bulb temperature Outdoor dry bulb temperature Outdoor wet bulb temperature Rated cooling 27 19 35 24 Intermediate refrigeration 27 19 35 24 Low temperature rating 27 19 29 19 Low temperature intermediate 27 19 29 19 Customized heat 20 ≤15 7 6 Intermediate heating 20 ≤15 7 6 Low temperature heating 20 ≤15 2 1

[0075] As shown in Table 1:

[0076] The air conditioner provided in Embodiment 1 of this application has significantly improved cooling and heating capacity, latent heat and energy efficiency compared with the air conditioner provided in Comparative Example 1, while also reducing power consumption. Therefore, the air conditioner provided in Embodiment 1 of this application has better cooling and heating performance and is more environmentally friendly.

[0077] In the above embodiments, the descriptions of each embodiment have different focuses. Parts not described in detail in a particular embodiment can be referred to in the relevant descriptions of other embodiments. In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, features defined with "first" and "second" may explicitly or implicitly include one or more features.

[0078] The heat exchanger and air conditioning indoor unit provided in the embodiments of this application have been described in detail above. Specific examples have been used in this article to illustrate the principle and implementation of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core idea of ​​this application. At the same time, for those skilled in the art, there will be changes in the specific implementation and application scope based on the idea of ​​this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A heat exchanger, characterized in that, It includes a distributor (4) and multiple flow paths. The distributor (4) is provided with multiple distribution ports (45). The cooling liquid inlet (5) of the multiple flow paths is connected to the multiple distribution ports (45) one by one. At least two of the flow paths are located at different heights, with the distribution port (45) connected to the cooling liquid inlet (5) of the flow path located at the higher position being lower than the distribution port (45) connected to the cooling liquid inlet (5) of the flow path located at the lower position.

2. The heat exchanger according to claim 1, characterized in that, The flow path is provided with a connected cooling liquid inlet (5) and a cooling gas outlet (6) at both ends, and at least one cooling liquid inlet (5) of the flow path is located above the cooling gas outlet (6).

3. The heat exchanger according to claim 2, characterized in that, The refrigeration liquid inlet (5) and the refrigeration gas outlet (6) of any two adjacent flow paths are staggered.

4. The heat exchanger according to claim 3, characterized in that, The heat exchanger includes multiple heat exchange plates, and multiple flow paths are respectively disposed on the multiple heat exchange plates. The multiple heat exchange plates are connected by bending in sequence to form a cavity for accommodating a cross-flow fan. The refrigeration liquid inlet (5) of the multiple flow paths is respectively disposed on the side of the corresponding heat exchange plate close to the cavity, and the refrigeration air outlet (6) of the multiple flow paths is respectively disposed on the side of the corresponding heat exchange plate away from the cavity.

5. The heat exchanger according to claim 4, characterized in that, At least two of the flow paths are unique flow paths. Each heat exchange plate is provided with at least one unique flow path. The unique flow path includes a plurality of sub-flow channels connected in sequence. The plurality of sub-flow channels are arranged in sequence along the direction away from the cavity. The refrigeration liquid inlet (5) of the unique flow path is connected to the sub-flow channel that is furthest away from the cavity. The refrigeration gas outlet (6) of the unique flow path is connected to the sub-flow channel that is closest to the cavity.

6. The heat exchanger according to claim 4, characterized in that, The plurality of heat exchange plates include a first heat exchange plate (1), a second heat exchange plate (2), and a third heat exchange plate (3) connected by bending in sequence; the second heat exchange plate (2) and the third heat exchange plate (3) are both located above the first heat exchange plate (1); the included angle between the first heat exchange plate (1) and the second heat exchange plate (2) is an obtuse angle, and the included angle between the second heat exchange plate (2) and the third heat exchange plate (3) is an acute angle, and the included angle is located on the side of the plurality of heat exchange plates facing the cavity.

7. The heat exchanger according to claim 6, characterized in that, At least one of the flow paths is a common flow path, which includes two sequentially connected flow segments (71), which are formed on two adjacent heat exchange plates respectively. The refrigeration liquid inlet (5) and the refrigeration gas outlet (6) of the common flow path are located on the same horizontal plane.

8. The heat exchanger according to claim 7, characterized in that, The refrigeration liquid inlet (5) and refrigeration gas outlet (6) of the common flow path are located on the second heat exchange plate (2) and the third heat exchange plate (3), respectively.

9. The heat exchanger according to claim 2, characterized in that, The flow path includes a plurality of straight pipes (8) and a plurality of bends (9) that are alternately connected in sequence, and the number of bends (9) is the same in at least two flow paths; and / or, at least two bends (9) are provided between the refrigeration liquid inlet (5) and the refrigeration gas outlet (6) of the flow path.

10. An indoor unit for an air conditioner, characterized in that, The heat exchanger includes any one of claims 1-9, wherein a non-azeotropic refrigerant mixture flows through the flow path.

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