Heat exchanger assembly and air conditioner indoor unit

Abstract

The present invention discloses a heat exchanger assembly and an indoor unit of an air conditioner. The heat exchanger assembly includes a main heat exchanger and an auxiliary heat exchanger. The heat exchange flow path of the heat exchanger assembly includes a first flow path and a second flow path. The second flow path includes a first branch, a second branch, a third branch, a fourth branch and a fifth branch connected in parallel. The first flow path flows through the fourth heat exchange tube of the auxiliary heat exchanger, the first branch flows through the first heat exchange tube, the second branch flows through part of the second heat exchange tube, the third branch flows through part of the second heat exchange tube, the fourth branch flows through the remaining second heat exchange tube and part of the third heat exchange tube, and the fifth branch flows through the remaining third heat exchange tube. When the heat exchanger assembly is refrigerated, the refrigerant flows through the first flow path and enters the first branch, the second branch, the third branch, the fourth branch and the fifth branch at the same time. The heat exchanger assembly of the present invention can reduce the pressure loss of the refrigerant, and the refrigerant in each branch can fully exchange heat, thereby improving the energy efficiency of the heat exchanger assembly.

Description

Technical Field

[0001] The invention relates to the technical field of air conditioning, in particular to a heat exchanger component and an air conditioner indoor unit. Background Art

[0002] In the field of air-conditioning indoor units, improving the heat exchange efficiency of heat exchangers has become an increasingly urgent topic. Most heat exchangers in the prior art have unreasonable flow path settings, resulting in uneven refrigerant flow rate and large pressure loss of refrigerant flow. In addition, the uneven distribution of the wind field itself will further increase the deviation flow and refrigerant pressure loss during cooling. The heat exchanger makes the refrigerant heat exchange in each flow path uneven, which leads to uneven heat exchange of the air-conditioning indoor unit and reduces the energy efficiency of the air-conditioning indoor unit. Summary of the invention

[0003] The present invention provides a heat exchanger component, which has the advantages of small pressure loss, uniform heat exchange and high heat exchange energy efficiency.

[0004] The present invention provides an air-conditioning indoor unit, wherein the air-conditioning indoor unit has the heat exchanger assembly as described above.

[0005] The heat exchanger assembly according to an embodiment of the present invention includes a main heat exchanger and an auxiliary heat exchanger, wherein the main heat exchanger includes a first heat exchanger, a second heat exchanger and a third heat exchanger, wherein the first heat exchanger, the second heat exchanger and the third heat exchanger are sequentially spliced, wherein the first heat exchanger has a first heat exchange tube, the second heat exchanger has a second heat exchange tube, and the third heat exchanger has a third heat exchange tube; the auxiliary heat exchanger is arranged on the windward side of the main heat exchanger, and the auxiliary heat exchanger has a fourth heat exchange tube;

[0006] Among them, the heat exchange flow path of the heat exchanger assembly includes a first flow path and a second flow path, the second flow path includes a first branch, a second branch, a third branch, a fourth branch and a fifth branch connected in parallel. When the heat exchanger assembly is refrigerated, the refrigerant flows through the first flow path and enters the first branch, the second branch, the third branch, the fourth branch and the fifth branch at the same time. The first flow path flows through the fourth heat exchange tube of the auxiliary heat exchanger, the first branch flows through the first heat exchange tube of the first heat exchanger, the second branch flows through a part of the second heat exchange tube of the second heat exchanger, the third branch flows through another part of the second heat exchange tube of the second heat exchanger, the fourth branch flows through the remaining second heat exchange tubes of the second heat exchanger and a part of the third heat exchange tubes of the third heat exchanger, and the fifth branch flows through the remaining third heat exchange tubes of the third heat exchanger.

[0007] According to the heat exchanger assembly of the embodiment of the present invention, the refrigerant flows through the first flow path and enters the first branch, the second branch, the third branch, the fourth branch and the fifth branch at the same time, thereby shortening the flow path of the refrigerant in each branch, and further reducing the pressure loss of the refrigerant, thereby improving the utilization rate of the refrigerant cooling or heat. The refrigerant flows in the first branch, the second branch, the third branch, the fourth branch and the fifth branch respectively, so that the refrigerant in each branch can fully exchange heat, thereby improving the energy efficiency of the heat exchanger assembly.

[0008] In some embodiments, the auxiliary heat exchanger is located on the windward side of the second heat exchanger.

[0009] In some embodiments, at least a portion of the second branch is located on a side of the third branch close to the first heat exchanger.

[0010] In some embodiments, the number of the second heat exchange tubes included in the second branch is greater than the number of the second heat exchange tubes included in the third branch.

[0011] In some embodiments, the second heat exchange tube included in the fourth branch is located on a side of the third branch close to the third heat exchanger.

[0012] In some embodiments, at least a portion of the fifth branch is located on a side of the fourth branch away from the second heat exchanger.

[0013] In some embodiments, the number of the third heat exchange tubes included in the fifth branch is greater than the total number of the third heat exchange tubes and the second heat exchange tubes included in the fourth branch.

[0014] In some embodiments, the number of the first heat exchange tubes included in the first branch is greater than the number of the second heat exchange tubes included in the second branch.

[0015] In some embodiments, an inner diameter of the fourth heat exchange tube is larger than inner diameters of the first heat exchange tube, the second heat exchange tube, and the third heat exchange tube.

[0016] In some embodiments, the inner cross-sectional area of ​​the fourth heat exchange tube is greater than 1.44 times the inner cross-sectional area of ​​the first heat exchange tube, the second heat exchange tube, and the third heat exchange tube.

[0017] In some embodiments, the inner cross-sectional area of ​​the fourth heat exchange tube is greater than 1.96 times the inner cross-sectional area of ​​the first heat exchange tube, the second heat exchange tube, and the third heat exchange tube.

[0018] In some embodiments, the first flow path and the first branch, the second branch, the third branch, the fourth branch, and the fifth branch are connected through a distributor.

[0019] In some embodiments, the first heat exchanger has at least three rows of the first heat exchange tubes in the air flow direction.

[0020] and / or, the second heat exchanger has at least three rows of the second heat exchange tubes in the air flow direction,

[0021] And / or, the third heat exchanger has at least three rows of third heat exchange tubes in the airflow direction.

[0022] In some embodiments, the number of heat exchange tubes of the main heat exchanger is 30 or more.

[0023] According to an embodiment of the present invention, the indoor unit of an air conditioner includes a shell, a wind wheel and a heat exchanger assembly as described above, the shell having an air inlet and an air outlet, the wind wheel is arranged in the shell to drive the air flow from the air inlet to the air outlet; the first heat exchanger, the second heat exchanger and the third heat exchanger are all arranged in the shell and are all located on the air inlet side of the wind wheel, and the connection part between the second heat exchanger and the third heat exchanger is the part of the main heat exchanger closest to the air inlet.

[0024] According to the air-conditioning indoor unit of an embodiment of the present invention, the refrigerant flows through the first flow path and enters the first branch, the second branch, the third branch, the fourth branch and the fifth branch at the same time, thereby shortening the flow path of the refrigerant in each branch, and further reducing the pressure loss of the refrigerant, thereby improving the utilization rate of the refrigerant cooling or heat. The refrigerant flows in the first branch, the second branch, the third branch, the fourth branch and the fifth branch respectively, so that the refrigerant in each branch can fully exchange heat, thereby improving the energy efficiency of the heat exchanger assembly.

[0025] In some embodiments, the air inlet is disposed on an upper side of the housing, and the second heat exchanger and the third heat exchanger are formed into a substantially inverted V shape covering the wind wheel from above in a side view.

[0026] In some embodiments, the first heat exchanger, the second heat exchanger and the third heat exchanger at least partially surround the wind wheel, the first heat exchanger is arranged at the front lower part of the wind wheel, the second heat exchanger is arranged at the front upper part of the wind wheel and is located between the first heat exchanger and the air inlet, the upper end of the second heat exchanger is inclined toward the rear, and the lower end is connected to the upper end of the first heat exchanger, and the third heat exchanger is arranged at the rear upper part of the wind wheel, and the upper end is inclined toward the front and connected to the upper end of the second heat exchanger.

[0027] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0029] Figure 1 is a schematic diagram of a partial structure of an air conditioner indoor unit according to an embodiment of the present invention;

[0030] Figure 2 is based on Figure 1 Schematic diagram of the structure of the heat exchanger assembly.

[0031] Reference numerals:

[0032] Air conditioner indoor unit 1000, heat exchanger assembly 100,

[0033] Main heat exchanger 1,

[0034] The first heat exchanger 11, the first heat exchange tube 111,

[0035] The second heat exchanger 12, the second heat exchange tube 121,

[0036] The third heat exchanger 13, the third heat exchange tube 131,

[0037] Auxiliary heat exchanger 2, fourth heat exchange tube 21,

[0038] First flow path 3, second flow path 4,

[0039] The first branch 41, the second branch 42, the third branch 43, the fourth branch 44, the fifth branch 45,

[0040] Distributor 5, housing 200, air inlet 201, air outlet 202, wind wheel 300. DETAILED DESCRIPTION

[0041] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0042] A heat exchanger assembly 100 and an air conditioner indoor unit 1000 according to an embodiment of the present invention will be described below with reference to the accompanying drawings.

[0043] like Figure 1 As shown, the air conditioner indoor unit 1000 according to the embodiment of the present invention comprises a housing 200, a wind wheel 300 and a heat exchanger assembly 100. The air conditioner indoor unit 1000 is an indoor unit of a wall-mounted split air conditioner, but may also be an indoor unit or indoor unit of other air conditioners, which is not limited here.

[0044] Specifically, refer to Figure 1 The housing 200 has an air inlet 201 and an air outlet 202. The air inlet 201 is arranged on the upper side of the housing 200, and the air outlet 202 is arranged on the lower side of the housing 200. Generally speaking, the width of the housing 200 along the front-to-back direction is less than 800 mm, and the height of the housing 200 along the up-down direction is less than 295 mm. The wind wheel 300 is arranged in the housing 200 to drive the air flow from the air inlet 201 to the air outlet 202. The wind wheel 300 is a cross-flow wind wheel, but it can also be other wind wheels, such as an axial flow wind wheel.

[0045] like Figure 1 As shown, the heat exchanger assembly 100 according to an embodiment of the present invention includes a main heat exchanger 1 and an auxiliary heat exchanger 2. The main heat exchanger 1 includes a first heat exchanger 11, a second heat exchanger 12 and a third heat exchanger 13. The first heat exchanger 11, the second heat exchanger 12 and the third heat exchanger 13 are all arranged in a shell 200 and are all located on the air inlet side of the wind wheel 300. In this way, the airflow can be driven by the wind wheel 300 to be sent out of the air-conditioning indoor unit 1000 after heat exchange in the heat exchanger assembly 100, so that the heat exchange energy efficiency of the air-conditioning indoor unit 1000 is better.

[0046] The first heat exchanger 11, the second heat exchanger 12 and the third heat exchanger 13 are sequentially spliced ​​to at least partially surround the wind wheel 300. Specifically, the first heat exchanger 11 is arranged in the front and lower part of the wind wheel 300. Here, the side away from the wall in the installation state of the air-conditioning indoor unit 1000 is the front, the side close to the wall is the rear, the side close to the ceiling is the top, and the side away from the ceiling is the bottom. The second heat exchanger 12 is arranged in the front and upper part of the wind wheel 300, and is located between the first heat exchanger 11 and the air inlet 201. The upper end of the second heat exchanger 12 is inclined toward the rear, and the lower end is connected to the upper end of the first heat exchanger 11. The third heat exchanger 13 is arranged in the upper and rear part of the wind wheel 300, and the upper end is inclined toward the front, and is connected to the upper end of the second heat exchanger 12.

[0047] The second heat exchanger 12 and the third heat exchanger 13 are formed into a substantially inverted V shape in a side view, covering the wind wheel 300 from above. The connection portion of the second heat exchanger 12 and the third heat exchanger 13 is the portion of the main heat exchanger 1 closest to the air inlet 201. Specifically, the distance between the connection portion of the second heat exchanger 12 and the third heat exchanger 13 and the air inlet 201 is shorter than the distance between any other portion of the main heat exchanger 1 and the air inlet 201.

[0048] like Figure 2As shown, the first heat exchanger 11 has a first heat exchange tube 111, the second heat exchanger 12 has a second heat exchange tube 121, and the third heat exchanger 13 has a third heat exchange tube 131; the auxiliary heat exchanger 2 is arranged on the windward side of the main heat exchanger 1, which can increase the heat exchange capacity of the heat exchanger assembly 100, and the auxiliary heat exchanger 2 has a fourth heat exchange tube 21; it should be noted that the first heat exchange tube 111 can provide a circulation channel for the refrigerant, so that the refrigerant can flow smoothly in the circulation channel. Similarly, the second heat exchange tube 121, the third heat exchange tube 131 and the fourth heat exchange tube 21 can all provide circulation channels for the refrigerant.

[0049] Among them, reference Figure 2 The heat exchange flow path of the heat exchanger assembly 100 includes a first flow path 3 and a second flow path 4. The second flow path 4 includes a first branch 41, a second branch 42, a third branch 43, a fourth branch 44 and a fifth branch 45 connected in parallel. When the heat exchanger assembly 100 is refrigerating, the refrigerant flows through the first flow path 3 and enters the first branch 41, the second branch 42, the third branch 43, the fourth branch 44 and the fifth branch 45 at the same time. The first flow path 3 flows through the fourth heat exchange pipe 21 of the auxiliary heat exchanger 2. The first branch 41 flows through the first heat exchange tube 111 of the first heat exchanger 11, the second branch 42 flows through a portion of the second heat exchange tube 121 of the second heat exchanger 12, the third branch 43 flows through another portion of the second heat exchange tube 121 of the second heat exchanger 12, the fourth branch 44 flows through the remaining second heat exchange tubes 121 of the second heat exchanger 12 and a portion of the third heat exchange tubes 131 of the third heat exchanger 13, and the fifth branch 45 flows through the remaining third heat exchange tubes 131 of the third heat exchanger 13.

[0050] It can be understood that during cooling, the refrigerant flows to the auxiliary heat exchanger 2, exchanges heat through the first flow path 3, and flows from the first flow path 3 to the second flow path 4, that is, flows to the first branch 41, the second branch 42, the third branch 43, the fourth branch 44 and the fifth branch 45 respectively. After the refrigerant exchanges heat through the first branch 41, the second branch 42, the third branch 43, the fourth branch 44 and the fifth branch 45, it flows out of the main heat exchanger 1. Therefore, the auxiliary heat exchanger 2 can enhance the heat exchange capacity of the heat exchanger assembly 100.

[0051] During heating, the refrigerant flows to the main heat exchanger 1, exchanges heat in the second flow path 4, and flows from the second flow path 4 to the first flow path 3, that is, the refrigerant flows from the first branch 41, the second branch 42, the third branch 43, the fourth branch 44 and the fifth branch 45 to the first flow path 3 respectively. After heat exchange in the first flow path 3, the refrigerant flows out of the auxiliary heat exchanger 2. It should be noted that the temperature of the refrigerant drops after heat exchange in the first branch 41, the second branch 42, the third branch 43, the fourth branch 44 and the fifth branch 45, and the temperature further drops after entering the second flow path 4. Therefore, the energy consumption of subsequent cooling of the refrigerant can be saved, and the heating performance of the heat exchanger assembly 100 can also be improved.

[0052] Among them, after flowing through the first flow path 3, the refrigerant simultaneously enters the first branch 41, the second branch 42, the third branch 43, the fourth branch 44 and the fifth branch 45. Compared with a heat exchanger with less than five branches, the heat exchanger assembly 100 of the embodiment of the present invention can shorten the flow path of the refrigerant in each branch, thereby reducing the pressure loss of the refrigerant and improving the utilization rate of the refrigerant cooling capacity or heat. The refrigerant flows in the first branch 41, the second branch 42, the third branch 43, the fourth branch 44 and the fifth branch 45 respectively, so that the refrigerant in each branch can fully exchange heat, thereby improving the energy efficiency of the heat exchanger assembly 100.

[0053] As shown in Table 1, taking different models as examples, when the second flow path 4 is divided into four branches and five branches, the effect of the refrigerant flowing in the second flow path 4 on the energy efficiency APF (Annual Performance Factor, i.e., annual energy consumption rate). Obviously, for the same model, when the second flow path 4 is divided into five branches, the larger the APF value, the better the heat exchange efficiency.

[0054] Table 1

[0055] Number of branches of the second flow path model APF 4 5.6KW 5.22 4 6.3KW 4.92 5 5.6KW 5.47 5 6.3KW 5.22

[0056] In such Figure 1-Figure 2 In one example shown, the auxiliary heat exchanger 2 can be located on the windward side of the second heat exchanger 12. During cooling, the refrigerant flows to the auxiliary heat exchanger 2, exchanges heat through the first flow path 3, and flows from the first flow path 3 to the second flow path 4, that is, flows to the first branch 41, the second branch 42, the third branch 43, the fourth branch 44 and the fifth branch 45 respectively. The refrigerant flows out of the main heat exchanger 1 after passing through the first branch 41, the second branch 42, the third branch 43, the fourth branch 44 and the fifth branch 45 for heat exchange. Thus, the length of the transition pipe in the entire heat exchanger assembly 100 can be shortened, thereby further simplifying the design of the flow path and reducing the pressure loss of the refrigerant flow. According to the arrangement of the wind field, the airflow flows faster near the air inlet 201, and the airflow flows relatively slowly at a position far away from the air inlet 201. When the temperature difference between the refrigerant and the airflow is greater in the place where the airflow flows faster than in the place where the airflow flows slower, the heat exchange energy efficiency of the heat exchanger assembly 100 is better. Therefore, following the flow from the part of the heat exchanger assembly 100 close to the air inlet 201 to the part of the heat exchanger assembly 100 away from the air inlet 201, arranging the auxiliary heat exchanger 2 on the windward side of the second heat exchanger 12 can make the heat exchange efficiency of the heat exchanger assembly 100 better.

[0057] In another example not shown in the drawings, the auxiliary heat exchanger 2 can also be located on the windward side of the third heat exchanger 13. During cooling, the refrigerant flows to the auxiliary heat exchanger 2, exchanges heat through the first flow path 3, and flows from the first flow path 3 to the second flow path 4, that is, flows to the first branch 41, the second branch 42, the third branch 43, the fourth branch 44 and the fifth branch 45 respectively. The refrigerant flows out of the main heat exchanger 1 after passing through the first branch 41, the second branch 42, the third branch 43, the fourth branch 44 and the fifth branch 45 for heat exchange. Thus, the length of the transition pipe in the entire heat exchanger assembly 100 can be shortened, thereby further simplifying the design of the flow path and reducing the pressure loss of the refrigerant flow. According to the arrangement of the wind field, the airflow flows faster near the air inlet 201, and the airflow flows relatively slowly at a position far away from the air inlet 201. When the temperature difference between the refrigerant and the airflow is greater in the place where the airflow flows faster than in the place where the airflow flows slower, the heat exchange energy efficiency of the heat exchanger assembly 100 is better. Therefore, following the flow from the part of the heat exchanger assembly 100 close to the air inlet 201 to the part of the heat exchanger assembly 100 away from the air inlet 201, arranging the auxiliary heat exchanger 2 on the windward side of the third heat exchanger 13 can make the heat exchange efficiency of the heat exchanger assembly 100 better.

[0058] The auxiliary heat exchanger 2 being located on the windward side of the second heat exchanger 12 and the auxiliary heat exchanger 2 being located on the windward side of the third heat exchanger 13 are only two feasible implementations of the present invention. However, the setting of the auxiliary heat exchanger 2 is not limited to this. The auxiliary heat exchanger 2 can also be arranged on the windward side between the second heat exchanger 12 and the third heat exchanger 13. The setting of the auxiliary heat exchanger 2 can follow the principle of flowing from the part of the heat exchanger assembly 100 close to the air inlet 201 to the part of the heat exchanger assembly 100 away from the air inlet 201. There are no excessive restrictions on the position of the auxiliary heat exchanger 2.

[0059] Combination Figure 2 According to some embodiments of the present invention, at least a portion of the second branch 42 is located on a side of the third branch 43 close to the first heat exchanger 11. It can be understood that the second branch 42 flows through a portion of the second heat exchange tube 121 of the second heat exchanger 12, and the third branch 43 flows through a portion of the second heat exchange tube 121 of the second heat exchanger 12. Thus, the second heat exchanger 12 may have at least two independent refrigerant flow branches, the second branch 42 and the third branch 43. Thus, the flow path of the refrigerant on the second heat exchanger 12 can be shortened, and the pressure loss of the refrigerant flow can be reduced. At least a portion of the second branch 42 is located on a side of the third branch 43 close to the first heat exchanger 11, so that the flow path on the second heat exchanger 12 can be along the first direction (such as Figure 2The arrangement (in the F1 direction shown) allows, on the one hand, the flow path on the second heat exchanger 12 to be closer to the flow direction of the airflow, and on the other hand, facilitates the spatial structural layout of the heat exchanger assembly 100, making the heat exchanger assembly 100 compact and space-saving.

[0060] Furthermore, if Figure 2 As shown, the number of second heat exchange tubes 121 included in the second branch 42 is greater than the number of second heat exchange tubes 121 included in the third branch 43. According to the arrangement of the wind farm, the airflow near the air inlet 201 flows faster, while the airflow at a position far from the air inlet 201 flows relatively slowly. Figure 1 The third branch 43 is located on a side of the second heat exchanger 12 close to the air inlet 201 , and the second branch 42 is located on a side of the second heat exchanger 12 away from the air inlet 201 , so that the wind speed of the third branch 43 is greater than the wind speed of the second branch 42 .

[0061] According to the heat exchange relationship Q=KA△t, where Q is the heat transfer rate, K is the heat transfer coefficient, A is the heat transfer area, and △t is the average temperature difference of heat transfer, in product design, Q and △t are preset values, and K is positively correlated with wind speed. In order to maintain the balance of the heat exchange relationship, it can be seen that the larger the K value, the smaller the A value; the smaller the K value, the larger the A value. Since the wind speed of the third branch 43 is greater than the wind speed of the second branch 42, the heat transfer coefficient K of the third branch 43 is greater than the heat transfer coefficient K of the second branch 42. Therefore, in order to maintain uniform refrigerant heat exchange between the second branch 42 and the third branch 43, the heat transfer area A of the third branch 43 needs to be smaller than the heat transfer area A of the second branch 42.

[0062] The more heat exchange tubes the second branch 42 includes, the larger the heat exchange area A of the second branch 42 is, and the fewer heat exchange tubes the second branch 42 includes, the smaller the heat exchange area A of the second branch 42 is; the more heat exchange tubes the third branch 43 includes, the larger the heat exchange area A of the third branch 43 is, and the fewer heat exchange tubes the third branch 43 includes, the smaller the heat exchange area A of the third branch 43 is. Therefore, the number of second heat exchange tubes 121 included in the second branch 42 is greater than the number of second heat exchange tubes 121 included in the third branch 43, so that the heat exchange area A of the second branch 42 can be greater than the heat exchange area A of the third branch 43, so that the refrigerant heat exchange of the second branch 42 and the third branch 43 is uniform.

[0063] In some embodiments of the present invention, Figure 2As shown, the second heat exchange tube 121 included in the fourth branch 44 is located on the side of the third branch 43 close to the third heat exchanger 13. It can be understood that the fourth branch 44 flows through part of the second heat exchange tube 121 of the second heat exchanger 12, and the third branch 43 flows through part of the second heat exchange tube 121 of the second heat exchanger 12. Therefore, the second heat exchanger 12 can have at least two independent refrigerant flow branches, namely the fourth branch 44 and the third branch 43. Therefore, the flow path of the refrigerant on the second heat exchanger 12 can be shortened, and the pressure loss of the refrigerant flow can be reduced. The second heat exchange tube 121 included in the fourth branch 44 is located on the side of the second heat exchange tube 121 included in the third branch 43 away from the first heat exchanger 11, so that the flow path on the second heat exchanger 12 can be along the first direction (such as Figure 2 The arrangement (in the F1 direction shown) allows, on the one hand, the flow path on the second heat exchanger 12 to be closer to the flow direction of the airflow, and on the other hand, facilitates the spatial structural layout of the heat exchanger assembly 100, making the heat exchanger assembly 100 compact and space-saving.

[0064] Combination Figure 2 According to some embodiments of the present invention, at least a portion of the fifth branch 45 is located on a side of the fourth branch 44 away from the second heat exchanger 12. It can be understood that the fourth branch 44 flows through a portion of the second heat exchange tube 121 of the second heat exchanger 12 and a portion of the third heat exchange tube 131 of the third heat exchanger 13, and the fifth branch 45 flows into the remaining third heat exchange tubes 131 of the third heat exchanger 13. Thus, the third heat exchanger 13 may have at least two independent refrigerant flow branches, namely the fourth branch 44 and the fifth branch 45. Thus, the flow path of the refrigerant on the third heat exchanger 13 can be shortened, and the pressure loss of the refrigerant flow can be reduced. At least a portion of the fifth branch 45 is located on a side of the fourth branch 44 away from the second heat exchanger 12, so that the flow path on the third heat exchanger 13 can be along the second direction (such as Figure 2 The arrangement (F2 direction as shown) allows, on the one hand, the flow path on the third heat exchanger 13 to be closer to the flow direction of the airflow, and on the other hand, facilitates the spatial structural layout of the heat exchanger assembly 100, making the heat exchanger assembly 100 compact and space-saving.

[0065] In some embodiments of the present invention, Figure 2 As shown, the number of the third heat exchange tubes 131 included in the fifth branch 45 is greater than the total number of the third heat exchange tubes 131 and the second heat exchange tubes 121 included in the fourth branch 44. According to the arrangement of the wind farm, the airflow near the air inlet 201 flows faster, while the airflow at a position far from the air inlet 201 flows relatively slowly. Figure 1 The fourth branch 44 is located on a side of the third heat exchanger 13 close to the air inlet 201 , and the fifth branch 45 is located on a side of the third heat exchanger 13 away from the air inlet 201 , so that the wind speed of the fourth branch 44 is greater than the wind speed of the fifth branch 45 .

[0066] According to the heat exchange relationship Q=KA△t, Q is the heat transfer rate, K is the heat transfer coefficient, A is the heat transfer area, and △t is the average temperature difference of heat transfer. In product design, Q and △t are preset values, and K is positively correlated with wind speed. In order to maintain the balance of the heat exchange relationship, it can be seen that the larger the K value, the smaller the A value; the smaller the K value, the larger the A value. Since the wind speed of the fourth branch 44 is greater than the wind speed of the fifth branch 45, the heat transfer coefficient K of the fourth branch 44 is greater than the heat transfer coefficient K of the fifth branch 45. Therefore, in order to maintain uniform refrigerant heat exchange between the fourth branch 44 and the fifth branch 45, the heat transfer area A of the fourth branch 44 needs to be smaller than the heat transfer area A of the fifth branch 45.

[0067] The more heat exchange tubes the fourth branch 44 includes, the larger the heat exchange area A of the fourth branch 44 is, and the fewer heat exchange tubes the fourth branch 44 includes, the smaller the heat exchange area A of the fourth branch 44 is; the more heat exchange tubes the fifth branch 45 includes, the larger the heat exchange area A of the fifth branch 45 is, and the fewer heat exchange tubes the fifth branch 45 includes, the smaller the heat exchange area A of the fifth branch 45 is. Therefore, the number of the third heat exchange tubes 131 included in the fifth branch 45 is greater than the total number of the third heat exchange tubes 131 and the second heat exchange tubes 121 included in the fourth branch 44, so that the heat exchange area A of the fifth branch 45 can be greater than the heat exchange area A of the fourth branch 44, so that the refrigerant heat exchange of the fourth branch 44 and the fifth branch 45 is uniform.

[0068] In some embodiments of the present invention, Figure 2 As shown, the number of first heat exchange tubes 111 included in the first branch 41 is greater than the number of second heat exchange tubes 121 included in the second branch 42. Similarly, the closer the branch is to the air inlet 201, the greater the wind speed. Therefore, the wind speed of the second branch 42 is greater than the wind speed of the first branch 41. According to the heat exchange relationship Q=KA△t, in order to maintain uniform heat exchange of the refrigerant between the first branch 41 and the second branch 42, the heat exchange area A of the second branch 42 needs to be smaller than the heat exchange area A of the first branch 41. Furthermore, the number of first heat exchange tubes 111 included in the first branch 41 is greater than the number of second heat exchange tubes 121 included in the second branch 42, so that the heat exchange area A of the first branch 41 can be greater than the heat exchange area A of the second branch 42, thereby making the heat exchange of the refrigerant between the first branch 41 and the second branch 42 uniform.

[0069] According to some embodiments of the present invention, the inner diameter of the fourth heat exchange tube 21 is greater than the inner diameters of the first heat exchange tube 111, the second heat exchange tube 121, and the third heat exchange tube 131. Figure 1As shown, along the airflow direction, the windward side of the main heat exchanger 1, i.e., the upstream of the main heat exchanger 1, uses a small-diameter heat exchange tube to reduce the material used for the heat exchange tube, thereby significantly reducing the overall cost of the heat exchanger assembly 100. However, when the refrigerant passes through the small-diameter heat exchange tube, the heat exchange resistance is large and the pressure loss is large, which is not conducive to the circulation of the refrigerant. Taking into account the cost of the heat exchanger assembly 100 and the refrigerant circulation efficiency, the auxiliary heat exchanger 2 is arranged on the windward side of the main heat exchanger 1 and the diameter of the fourth heat exchange tube 21 is larger than the diameters of the first heat exchange tube 111, the second heat exchange tube 121, and the third heat exchange tube 131, which can reduce the production cost of the heat exchanger assembly 100 while improving the heat exchange efficiency of the heat exchanger assembly 100.

[0070] In some embodiments of the present invention, the inner cross-sectional area of ​​the fourth heat exchange tube 21 is 1.44 times or more of the inner cross-sectional area of ​​the first heat exchange tube 111, the second heat exchange tube 121 and the third heat exchange tube 131. The inner cross-sectional area of ​​the tube can be understood as the cross-sectional area of ​​the heat exchange tube calculated based on the inner diameter of the heat exchange tube. For example, the inner diameter of the fourth heat exchange tube 21 can be 6 mm, and the inner cross-sectional area of ​​the fourth heat exchange tube 21 is 9πmm. 2 , the inner diameters of the first heat exchange tube 111, the second heat exchange tube 121 and the third heat exchange tube 131 can all be 5 mm, then the inner cross-sectional areas of the first heat exchange tube 111, the second heat exchange tube 121 and the third heat exchange tube 131 are all 6.25πmm 2 , thus, 9π / 6.25π is 1.44. Since the first flow path 3 flows through the fourth heat exchange tube 21, and the five branches of the second flow path 4 flow through the first heat exchange tube 111, the second heat exchange tube 121 and the third heat exchange tube 131, the inner cross-sectional area of ​​the fourth heat exchange tube 21 is more than 1.44 times the inner cross-sectional area of ​​the first heat exchange tube 111, the second heat exchange tube 121 and the third heat exchange tube 131, it is convenient for the first flow path 3 to quickly disperse the refrigerant to the five branches of the first flow path 4, or the refrigerant quickly converges from the five branches of the first flow path 4 to the first flow path 3, which can improve the efficiency of the refrigerant flow, thereby improving the heat exchange effect of the air conditioner 1000.

[0071] Furthermore, the inner cross-sectional area of ​​the fourth heat exchange tube 21 is 1.96 times or more of the inner cross-sectional area of ​​the first heat exchange tube 111, the second heat exchange tube 121 and the third heat exchange tube 131. For example, the inner diameter of the fourth heat exchange tube 21 may be 7 mm, and the inner cross-sectional area of ​​the fourth heat exchange tube 21 is 12.25πmm. 2 , the inner diameters of the first heat exchange tube 111, the second heat exchange tube 121 and the third heat exchange tube 131 can all be 5 mm, then the inner cross-sectional areas of the first heat exchange tube 111, the second heat exchange tube 121 and the third heat exchange tube 131 are all 6.25πmm 2, thus, 12.25π / 6.25π is 1.96. Therefore, the cross-sectional area of ​​the fourth heat exchange tube 21 is larger than that of the first heat exchange tube 111, the second heat exchange tube 121 and the third heat exchange tube 131, so that more refrigerant can flow in the fourth heat exchange tube 21, thereby facilitating the first flow path 3 to quickly disperse the refrigerant to the five branches of the first flow path 4, or the refrigerant quickly converges from the five branches of the first flow path 4 to the first flow path 3, which can improve the efficiency of the refrigerant flow, thereby improving the heat exchange effect of the air conditioner 1000.

[0072] like Figure 2 As shown, according to some embodiments of the present invention, the first flow path 3 and the first branch 41, the second branch 42, the third branch 43, the fourth branch 44, and the fifth branch 45 are connected through the distributor 5. Thus, the distributor 5 can facilitate the refrigerant of the first flow path 3 to flow to the first branch 41, the second branch 42, the third branch 43, the fourth branch 44, and the fifth branch 45 after being gathered at the distributor 5; it is also convenient for the refrigerant of the first branch 41, the second branch 42, the third branch 43, the fourth branch 44, and the fifth branch 45 to flow to the first flow path 3 after being gathered at the distributor 5.

[0073] In some embodiments of the present invention, Figure 2 The first heat exchanger 11 has at least three rows of first heat exchange tubes 111 in the direction of airflow, and / or the second heat exchanger 12 has at least three rows of second heat exchange tubes 121 in the direction of airflow, and / or the third heat exchanger 13 has at least three rows of third heat exchange tubes 131 in the direction of airflow. This can avoid insufficient heat exchange due to too few rows of heat exchange tubes and waste due to too many heat exchange tubes.

[0074] According to some embodiments of the present invention, reference Figure 2 , the number of heat exchange tubes of the main heat exchanger 1 is more than 30. This can make the heat exchange efficiency of the heat exchanger assembly 100 better.

[0075] Further, taking the number of heat exchange tubes of the main heat exchanger 1 as 30 as an example, the first branch 41 includes 7 first heat exchange tubes 111, the second branch 42 includes 7 second heat exchange tubes 121, the third branch 43 includes 5 second heat exchange tubes 121, the fourth branch 44 includes 1 second heat exchange tube 121 and 4 third heat exchange tubes 131, and the fifth branch 45 includes 6 third heat exchange tubes 131, as shown in Table 2, which shows the impact of different distribution of the number of heat exchange tubes in the five branches on the energy efficiency APF, full name Annual Performance Factor, that is, the annual energy consumption rate. As can be seen from Table 2, the heat exchange energy efficiency of the present invention is better.

[0076] Table 2

[0077] Number of heat exchange tubes in each branch APF 7+6+5+5+7 5.01 7+7+6+4+6 5.10 7+7+5+5+6 (the present invention) 5.22

[0078] In some embodiments of the present invention, the width of the shell 200 along the front-to-back direction is less than 800 mm, and the height of the shell 200 along the up-down direction is less than 295 mm, thereby making the size of the air-conditioning indoor unit 1000 more appropriate and reducing the overall size of the air-conditioning indoor unit 1000.

[0079] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0080] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0081] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0082] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A heat exchanger assembly, It is characterized in that include: A main heat exchanger, the main heat exchanger comprising a first heat exchanger, a second heat exchanger and a third heat exchanger, the first heat exchanger, the second heat exchanger and the third heat exchanger are spliced ​​in sequence, the first heat exchanger has a first heat exchange tube, the second heat exchanger has a second heat exchange tube, and the third heat exchanger has a third heat exchange tube; an auxiliary heat exchanger, the auxiliary heat exchanger being arranged on the windward side of the main heat exchanger, the auxiliary heat exchanger having a fourth heat exchange tube; The heat exchange flow path of the heat exchanger assembly includes a first flow path and a second flow path, and the second flow path includes a first branch, a second branch, a third branch, a fourth branch and a fifth branch connected in parallel. When the heat exchanger assembly is cooling, the refrigerant flows through the first flow path and then enters the first branch, the second branch, the third branch, the fourth branch and the fifth branch respectively. The first flow path flows through the fourth heat exchange tube of the auxiliary heat exchanger, the first branch flows through the first heat exchange tube of the first heat exchanger, the second branch flows through a portion of the second heat exchange tube of the second heat exchanger, the third branch flows through another portion of the second heat exchange tube of the second heat exchanger, the fourth branch flows through the remaining second heat exchange tubes of the second heat exchanger and a portion of the third heat exchange tubes of the third heat exchanger, and the fifth branch flows through the remaining third heat exchange tubes of the third heat exchanger; At least a portion of the second branch is located on a side of the third branch close to the first heat exchanger, and the number of the second heat exchange tubes included in the second branch is greater than the number of the second heat exchange tubes included in the third branch; The second heat exchange tube included in the fourth branch is located on a side of the third branch close to the third heat exchanger.

2. The heat exchanger assembly according to claim 1, It is characterized in that The auxiliary heat exchanger is located on the windward side of the second heat exchanger.

3. The heat exchanger assembly according to claim 1, It is characterized in that At least a portion of the fifth branch is located on a side of the fourth branch away from the second heat exchanger.

4. The heat exchanger assembly according to claim 3, It is characterized in that The number of the third heat exchange tubes included in the fifth branch is greater than the total number of the third heat exchange tubes and the second heat exchange tubes included in the fourth branch.

5. The heat exchanger assembly according to claim 1, It is characterized in that The number of the first heat exchange tubes included in the first branch is greater than the number of the second heat exchange tubes included in the second branch.

6. The heat exchanger assembly according to claim 1, It is characterized in that An inner diameter of the fourth heat exchange tube is greater than inner diameters of the first heat exchange tube, the second heat exchange tube, and the third heat exchange tube.

7. The heat exchanger assembly according to claim 6, It is characterized in that The inner cross-sectional area of ​​the fourth heat exchange tube is greater than or equal to 1.44 times the inner cross-sectional area of ​​the first heat exchange tube, the second heat exchange tube, and the third heat exchange tube.

8. The heat exchanger assembly according to claim 7, It is characterized in that The inner cross-sectional area of ​​the fourth heat exchange tube is greater than or equal to 1.96 times the inner cross-sectional area of ​​the first heat exchange tube, the second heat exchange tube, and the third heat exchange tube.

9. The heat exchanger assembly according to claim 1, It is characterized in that The first flow path and the first branch, the second branch, the third branch, the fourth branch, and the fifth branch are connected through a distributor.

10. The heat exchanger assembly according to claim 1, It is characterized in that The first heat exchanger has at least three rows of the first heat exchange tubes in the air flow direction. and / or, the second heat exchanger has at least three rows of the second heat exchange tubes in the air flow direction, And / or, the third heat exchanger has at least three rows of third heat exchange tubes in the airflow direction.

11. The heat exchanger assembly according to claim 1, It is characterized in that The number of heat exchange tubes of the main heat exchanger is more than 30.

12. An air conditioner indoor unit, It is characterized in that include: A housing having an air inlet and an air outlet; A wind wheel, the wind wheel is arranged in the housing to drive the air flow from the air inlet to the air outlet; According to the heat exchanger assembly according to any one of claims 1 to 11, the first heat exchanger, the second heat exchanger and the third heat exchanger are all arranged in the shell and are located on the air inlet side of the wind wheel, and the connection part between the second heat exchanger and the third heat exchanger is the part of the main heat exchanger closest to the air inlet.

13. The air conditioner indoor unit according to claim 12, It is characterized in that The air inlet is arranged on the upper side of the housing, The second heat exchanger and the third heat exchanger are formed in a substantially inverted V shape in a side view so as to cover the wind wheel from above.

14. The air conditioner indoor unit according to claim 13, It is characterized in that The first heat exchanger, the second heat exchanger and the third heat exchanger at least partially surround the wind wheel, the first heat exchanger is arranged at the front lower part of the wind wheel, the second heat exchanger is arranged at the front upper part of the wind wheel and is located between the first heat exchanger and the air inlet, the upper end of the second heat exchanger is inclined toward the rear, and the lower end is connected to the upper end of the first heat exchanger, and the third heat exchanger is arranged at the rear upper part of the wind wheel, and the upper end is inclined toward the front and connected to the upper end of the second heat exchanger.

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