Indoor unit heat exchanger, indoor unit and air conditioner

Abstract

The utility model provides an indoor unit heat exchanger, an indoor unit and an air conditioner, relates to the technical field of air conditioners, and solves the technical problem that no heat exchanger structure matched with an axial flow fan exists. The indoor heat exchanger is a fin type heat exchanger and comprises an evaporation pipe set and heat exchange fins. The heat exchange fins are spirally arranged by taking the center of the indoor heat exchanger as the center; the evaporation pipe set is arranged in the multiple circles of heat exchange fins in a penetrating mode. The heat exchange fins are arranged to be of the spiral structure, air flow spirally flowing at the outlet of the axial flow fan passes through the heat exchanger without hindrance, wind resistance is reduced, and the problem that the flowing direction of the air flow at the outlet of the axial flow fan is not matched with that of the air flow of the heat exchanger is solved. Meanwhile, spiral flowing is beneficial to increasing the actual flowing distance of airflow passing through the heat exchanger, the heat exchange efficiency of the heat exchanger is improved, and the size of the heat exchanger is reduced with the same heat exchange amount; compared with a traditional evaporator, resistance is reduced by 35%, and the heat exchange effect is improved by 40%; the fins of the heat exchanger are integrated, so that the stamping process is reduced.

Description

An indoor heat exchanger, an indoor unit, and an air conditioner Technical Field

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

[0002] Axial fans are increasingly used in air conditioning indoor units due to their large air volume and high efficiency. However, the outlet airflow of axial fans has a large circumferential velocity and is spiral forward. In contrast, conventional finned heat exchangers have parallel fins that only allow airflow to pass through the gaps between the fins. This results in the fins generating significant resistance to the airflow, causing the heat exchanger flow channel to block the rotating airflow at the outlet of the axial fan, thus generating significant flow losses and reducing the flow rate.

[0003] Existing technology discloses a high-efficiency heat dissipation finned evaporator, including a housing and evaporator assemblies symmetrically arranged within the housing. A drive assembly drives a linkage assembly to reciprocate up and down. The linkage assembly causes the evaporator assemblies, which are movably connected, to expand or close in an inverted V-shape along a directional assembly. The heat exchange efficiency of the evaporator assemblies is controlled according to the gas flow rate within the housing, avoiding energy loss caused by the evaporator assemblies' inability to control heat exchange efficiency based on gas flow rate. However, this type of evaporator requires a drive assembly to expand or close the evaporator, resulting in complex manufacturing processes and high costs. Furthermore, its finned structure is unsuitable for axial fans. Summary of the Invention

[0004] The purpose of this utility model is to provide an indoor unit heat exchanger, an indoor unit, and an air conditioner to solve the technical problem of existing heat exchanger structures that do not have an adaptation to axial flow fans.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] This utility model provides an indoor heat exchanger, which is a finned heat exchanger, including an evaporator tube assembly and heat exchange fins; the heat exchange fins are arranged in a spiral shape with the center of the indoor heat exchanger as the center; the evaporator tube assembly passes through multiple turns of the heat exchange fins.

[0007] The finned heat exchanger provided by this utility model, by setting the heat exchange fins into a spiral structure, allows the spiral airflow from the axial fan outlet to pass through unobstructed, reducing wind resistance and solving the problem of mismatch between the airflow direction at the axial fan outlet and the airflow direction in the heat exchanger. At the same time, the spiral flow helps to increase the actual distance the airflow travels through the heat exchanger, improving the heat exchange efficiency and reducing the heat exchanger volume for the same heat exchange capacity. Compared with traditional evaporators, the resistance is reduced by 35% and the heat exchange effect is improved by 40%. The heat exchanger fins are integral, reducing the stamping process.

[0008] Based on the above technical solution, the present invention can be further improved as follows.

[0009] As a further improvement of this utility model, the spiral inner diameter d0 of the heat exchange fins is greater than the hub diameter D0 of the axial fan.

[0010] The selection of the spiral inner diameter d0 in this utility model mainly considers two factors: first, the diameter D0 of the fan hub. The downstream airflow swirling ability in the fan outlet hub area is poor, and the heat exchange effect of fins arranged here is limited. Second, considering the installation of the heat exchanger evaporator tube, the spiral inner diameter d0 should be greater than the hub radius D0.

[0011] As a further improvement of this utility model, the spiral inner diameter d0 of the heat exchange fins is equal to 1-1.2 times the hub diameter D0 of the axial fan.

[0012] Through simulation calculations, the optimal embodiment was selected where the spiral inner diameter d0 of the heat exchange fins is equal to 1-1.2 times the hub diameter D0 of the axial fan, which can achieve the best effect.

[0013] As a further improvement of this utility model, the spiral outer diameter d1 of the heat exchange fins is greater than the outer diameter D1 of the axial fan.

[0014] The selection of the spiral outer diameter d1 in this utility model mainly considers the outer diameter D1 of the axial fan and the distance D between the heat exchanger and the axial fan. The selection of D is mainly based on structural considerations, which need to ensure the size of the motor and the size of the motor bracket. The spiral outer diameter d1 should be appropriately larger than the outer diameter D1 of the axial fan, because the airflow at the outlet of the axial fan has a certain centrifugal tendency and a certain expansion state. Increasing the spiral outer diameter helps to increase the heat exchanger area and improve the heat exchange efficiency.

[0015] As a further improvement of this utility model, the spiral outer diameter d1 of the heat exchange fins is equal to the outer diameter D1 of the axial fan plus 0.1-0.5 times the distance D between the heat exchanger and the axial fan.

[0016] When the distance D between the heat exchanger and the axial fan increases, the outer diameter d1 of the spiral should also be increased appropriately. Therefore, through simulation calculation, the above dimensional relationship can achieve the best implementation effect.

[0017] It should be noted that the selection of fin spacing d and fin thickness t is the same as that for conventional heat exchanger fin spacing, mainly considering the manufacturing process. When the fins are arranged in a spiral shape, care should be taken to cover the evaporator tubes at both ends.

[0018] As a further improvement of this utility model, the fin height h of the heat exchange fins is greater than the height of the evaporator tube assembly.

[0019] The selection of fin height h in this invention mainly considers the number of rows of evaporator tubes. The fin height should cover the evaporator tubes and leave an appropriate margin.

[0020] As a further improvement of this utility model, the evaporator tube assembly includes a refrigerant inlet main pipe, a refrigerant outlet main pipe, an evaporator tube, a refrigerant inlet pipe, and a refrigerant outlet pipe; wherein:

[0021] Both the refrigerant inlet main pipe and the refrigerant outlet main pipe are closed-loop pipes;

[0022] The refrigerant inlet pipe is connected to the refrigerant inlet main pipe;

[0023] The refrigerant outlet pipe is connected to the refrigerant outlet main pipe;

[0024] The number of evaporator tubes is in several groups, which are distributed at equal distances in a divergent pattern with the center of the indoor heat exchanger as the center; each group of evaporator tubes is S-shaped, with one end connected to the refrigerant inlet main pipe and the other end connected to the refrigerant outlet main pipe.

[0025] This utility model provides an indoor unit, including the indoor heat exchanger.

[0026] As a further improvement of this utility model, it also includes a duct housing and an axial fan; wherein:

[0027] The indoor heat exchanger is connected to one end of the duct shell.

[0028] The axial fan is installed at the end of the duct housing away from the indoor heat exchanger.

[0029] As a further improvement of this utility model, guide vanes are provided at the outlet of the axial fan.

[0030] Adding guide vanes to the fan outlet can alleviate swirling.

[0031] The indoor unit of this invention uses a spiral heat exchanger, which reduces flow resistance. When adapted to an axial fan, it reduces resistance by 35% compared to a traditional evaporator and improves heat exchange efficiency by 40%.

[0032] The present invention provides an air conditioner, including the indoor unit.

[0033] The air conditioner of this utility model has a heat exchanger fin that is spiral-shaped, allowing the spiral airflow at the axial fan outlet to pass through unimpeded, thus reducing wind resistance. At the same time, the spiral flow helps to increase the actual distance the airflow travels through the heat exchanger, improving the heat exchange efficiency and reducing the volume of the heat exchanger for the same amount of heat exchange. The heat exchanger fins are integral, reducing the stamping process. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0035] Figure 1 is a front view of the indoor unit of this utility model;

[0036] Figure 2 is a front view of the indoor heat exchanger of this utility model;

[0037] Figure 3 is a three-dimensional structural diagram of the indoor heat exchanger of this utility model;

[0038] Figure 4 is a top view of the indoor heat exchanger of this utility model;

[0039] Figure 5 is a side view of the indoor heat exchanger of this utility model.

[0040] In the diagram: 10. Duct housing; 20. Axial fan; 30. Indoor heat exchanger; 1. Refrigerant inlet pipe; 2. Refrigerant outlet pipe; 3. Refrigerant inlet main pipe; 4. Refrigerant outlet main pipe; 5. Evaporator pipe; 6. Heat exchange fins. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be described in detail below. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the embodiments of this utility model, all other implementation methods obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0042] Example 1:

[0043] As shown in Figures 2-5, this utility model provides an indoor heat exchanger 30, which is a finned heat exchanger including an evaporator tube assembly and heat exchange fins 6. The evaporator tube assembly is used to circulate refrigerant. The heat exchange fins 6 are arranged in a spiral shape with the center of the indoor heat exchanger 30 as the center. The evaporator tube assembly is inserted into multiple turns of heat exchange fins 6. The heat exchange fins 6 are used to conduct heat exchange with the evaporator tube assembly and to contact the cooling airflow for contact heat exchange, thereby dissipating the heat in the refrigerant.

[0044] The finned heat exchanger provided by this utility model, by setting the heat exchange fins into a spiral structure, allows the spiral airflow from the axial fan outlet to pass through unobstructed, reducing wind resistance and solving the problem of mismatch between the airflow direction at the axial fan outlet and the airflow direction in the heat exchanger. At the same time, the spiral flow helps to increase the actual distance the airflow travels through the heat exchanger, improving the heat exchange efficiency and reducing the heat exchanger volume for the same heat exchange capacity. Compared with traditional evaporators, the resistance is reduced by 35% and the heat exchange effect is improved by 40%. The heat exchanger fins are integral, reducing the stamping process.

[0045] It should be noted that, as shown in Figure 3, the heat exchange fin 6 is formed by spiral bending of a single plate. One end of the heat exchange fin 6 is located at the center of the spiral, and the other end is located on the outer side of the spiral. Considering the poor airflow swirling ability in the hub area of ​​the axial fan 20 outlet, in order to fully utilize the function of the indoor heat exchanger 30, improve heat exchange efficiency, and rationally specify the structure, in this embodiment, the spiral inner diameter d0 of the heat exchange fin is greater than the hub diameter D0 of the axial fan 20.

[0046] The selection of the spiral inner diameter d0 of this utility model mainly considers two factors: First, the hub diameter D0 of the axial fan hub. The downstream airflow swirl capability of the axial fan outlet hub area is poor, and the heat exchange effect of fins arranged here is limited. Second, considering the installation of the heat exchanger evaporator tube 5, the spiral inner diameter d0 should be greater than the hub radius D0.

[0047] As an optional embodiment of this utility model, as shown in Figures 1 and 4, the spiral inner diameter d0 of the heat exchange fin 6 is equal to 1-1.2 times the hub diameter D0 of the axial fan.

[0048] Through simulation calculations, the optimal embodiment was selected where the spiral inner diameter d0 of the heat exchange fins is equal to 1-1.2 times the hub diameter D0 of the axial fan, which can achieve the best effect.

[0049] In order to increase the heat exchanger area and improve the heat exchange efficiency, the outer diameter d1 of the heat exchange fin 6 is larger than the outer diameter D1 of the axial fan.

[0050] The selection of the spiral outer diameter d1 in this utility model mainly considers the outer diameter D1 of the axial fan and the distance D between the heat exchanger and the axial fan. The selection of D is mainly based on structural considerations, which need to ensure the size of the motor and the size of the motor bracket. The spiral outer diameter d1 should be appropriately larger than the outer diameter D1 of the axial fan, because the airflow at the outlet of the axial fan has a certain centrifugal tendency and a certain expansion state. Increasing the spiral outer diameter helps to increase the heat exchanger area and improve the heat exchange efficiency.

[0051] As an optional embodiment of this utility model, as shown in Figure 1, the spiral outer diameter d1 of the heat exchange fin 6 is equal to the outer diameter D1 of the axial fan plus 0.1-0.5 times the distance D between the heat exchanger and the axial fan.

[0052] When the distance D between the heat exchanger and the axial fan increases, the outer diameter d1 of the spiral should also be increased appropriately. Therefore, through simulation calculation, the above dimensional relationship can achieve the best implementation effect.

[0053] It should be noted that the selection of fin spacing d and fin thickness t is the same as that for conventional heat exchanger fin spacing, mainly considering the manufacturing process. When the fins are arranged in a spiral shape, care should be taken to cover the beginning and end of the evaporator tubes 5.

[0054] Considering the heat exchange efficiency of the indoor heat exchanger, as shown in Figure 2, in order to ensure that the heat supplied in the evaporator tube 5 can be exchanged as much as possible, the fin height h of the heat exchange fin 6 is greater than the height of the evaporator tube assembly.

[0055] The selection of fin height h in this invention mainly considers the number of rows of evaporator tubes. The fin height should cover the evaporator tubes and leave an appropriate margin.

[0056] It should be noted that the selection of the number of rows of evaporator tubes 5 mainly depends on the heat exchange capacity. Due to structural limitations, the evaporator tubes 5 need to be folded back, therefore, the evaporator tubes 5 can only adopt an even number of rows, as shown in Figures 1-3. In this embodiment, a four-row layout of evaporator tubes 5 is illustrated. When the heat exchange capacity is large, a four-row layout can be used; when the heat exchange capacity is small, a two-row layout can be used. Around the outer periphery of the heat exchange fins 6, the main pipe is connected to each evaporator tube 5 and connected to the refrigerant inlet and outlet pipes, forming a complete evaporator tube loop.

[0057] The specifications for each part of the indoor heat exchanger are designed as follows:

[0058] When the outer diameter D1 of the axial fan 20 of the air conditioner is 300mm and the hub diameter D0 is 80mm, the distance D from the heat exchanger to the axial fan is 80mm. The inner diameter of the spiral of the heat exchange fin 6 can be taken as d0 = 1.1D0, which is 88mm, and the outer diameter of the spiral of the heat exchange fin 6 is d1 = 1.1D1 + 0.2D, which is 346mm. According to the previous heat exchanger fin manufacturing process, the fin spacing d can be selected as 1.5mm and the fin thickness t as 0.2mm. When four rows of evaporator tubes are used, the fin height h can be selected as 60mm. According to the required heat exchange, the number of evaporator tube groups can be selected as 60 groups, thus completing the overall design of the spiral heat exchanger.

[0059] As shown in Figures 1-5, in this embodiment, the evaporator assembly includes a refrigerant inlet manifold 3, a refrigerant outlet manifold 4, an evaporator 5, a refrigerant inlet pipe 1, and a refrigerant outlet pipe 2; wherein:

[0060] Both the refrigerant inlet manifold 3 and the refrigerant outlet manifold 4 are closed loop pipes;

[0061] Refrigerant inlet pipe 1 is connected to refrigerant inlet main pipe 3 and is used to input refrigerant;

[0062] Refrigerant outlet pipe 2 is connected to refrigerant outlet main pipe 4 for refrigerant output;

[0063] The number of evaporator tubes 5 is several groups, which are distributed in a radiating pattern at equal distances from the center of the indoor heat exchanger 30. Each group of evaporator tubes 5 forms an S-shaped structure with four rows of evaporator tubes 5. One end of each group of evaporator tubes 5 is connected to the refrigerant inlet main pipe 3, and the other end is connected to the refrigerant outlet main pipe 4.

[0064] It should be noted that, for the sake of simplicity and clarity of the images, only 12 sets of evaporator tubes 5 are shown in Figures 1-5, and the heat exchange fins 6 are arranged relatively sparsely. The specific heat exchange fin density and the number of evaporator tubes can be increased according to actual needs.

[0065] The heat exchange fins 6 of this utility model are spiral-shaped, allowing the spiral airflow at the axial fan outlet to pass through unimpeded, thus reducing wind resistance. At the same time, the spiral flow helps to increase the actual distance the airflow travels through the heat exchanger, improving the heat exchange efficiency and reducing the volume of the heat exchanger for the same amount of heat exchange. The heat exchanger fins are integral, reducing the stamping process.

[0066] Example 2:

[0067] As shown in Figure 1, the present invention provides an indoor unit including the aforementioned indoor heat exchanger 30.

[0068] As shown in Figures 2-5, the indoor heat exchanger 30 is a finned heat exchanger, including an evaporator tube assembly and heat exchange fins 6. The evaporator tube assembly is used to circulate the refrigerant. The heat exchange fins 6 are arranged in a spiral shape with the center of the indoor heat exchanger 30 as the center. The evaporator tube assembly is inserted into multiple turns of heat exchange fins 6. The heat exchange fins 6 are used to conduct heat exchange with the evaporator tube assembly and to contact the cooling airflow for contact heat exchange, thereby dissipating the heat in the refrigerant.

[0069] The finned heat exchanger provided by this utility model, by setting the heat exchange fins into a spiral structure, allows the spiral airflow from the axial fan outlet to pass through unobstructed, reducing wind resistance and solving the problem of mismatch between the airflow direction at the axial fan outlet and the airflow direction in the heat exchanger. At the same time, the spiral flow helps to increase the actual distance the airflow travels through the heat exchanger, improving the heat exchange efficiency and reducing the heat exchanger volume for the same heat exchange capacity. Compared with traditional evaporators, the resistance is reduced by 35% and the heat exchange effect is improved by 40%. The heat exchanger fins are integral, reducing the stamping process.

[0070] Furthermore, the spiral heat exchanger mainly comprises spirally arranged heat exchange fins 6 and evaporator tube assemblies. When implementing the spiral heat exchange fins 6, the following dimensions need to be considered: spiral inner diameter d0, spiral outer diameter d1, fin spacing d, fin thickness t, fin height h, distance D between the heat exchanger and the axial fan, and the number of evaporator tubes, etc. These will be explained in detail below.

[0071] It should be noted that, as shown in Figure 3, the heat exchange fin 6 is formed by spiral bending of a single plate. One end of the heat exchange fin 6 is located at the center of the spiral, and the other end is located on the outer side of the spiral. Considering the poor airflow swirling ability in the hub area of ​​the axial fan 20 outlet, in order to fully utilize the function of the indoor heat exchanger 30, improve heat exchange efficiency, and rationally specify the structure, in this embodiment, the spiral inner diameter d0 of the heat exchange fin is greater than the hub diameter D0 of the axial fan 20.

[0072] The selection of the spiral inner diameter d0 of this utility model mainly considers two factors: First, the hub diameter D0 of the axial fan hub. The downstream airflow swirl capability of the axial fan outlet hub area is poor, and the heat exchange effect of fins arranged here is limited. Second, considering the installation of the heat exchanger evaporator tube 5, the spiral inner diameter d0 should be greater than the hub radius D0.

[0073] As an optional embodiment of this utility model, as shown in Figures 1 and 4, the spiral inner diameter d0 of the heat exchange fin 6 is equal to 1-1.2 times the hub diameter D0 of the axial fan.

[0074] Through simulation calculations, the optimal embodiment was selected where the spiral inner diameter d0 of the heat exchange fins is equal to 1-1.2 times the hub diameter D0 of the axial fan, which can achieve the best effect.

[0075] In order to increase the heat exchanger area and improve the heat exchange efficiency, the outer diameter d1 of the heat exchange fin 6 is larger than the outer diameter D1 of the axial fan.

[0076] The selection of the spiral outer diameter d1 in this utility model mainly considers the outer diameter D1 of the axial fan and the distance D between the heat exchanger and the axial fan. The selection of D is mainly based on structural considerations, which need to ensure the size of the motor and the size of the motor bracket. The spiral outer diameter d1 should be appropriately larger than the outer diameter D1 of the axial fan, because the airflow at the outlet of the axial fan has a certain centrifugal tendency and a certain expansion state. Increasing the spiral outer diameter helps to increase the heat exchanger area and improve the heat exchange efficiency.

[0077] As an optional embodiment of this utility model, as shown in Figure 1, the spiral outer diameter d1 of the heat exchange fin 6 is equal to the outer diameter D1 of the axial fan plus 0.1-0.5 times the distance D between the heat exchanger and the axial fan.

[0078] When the distance D between the heat exchanger and the axial fan increases, the outer diameter d1 of the spiral should also be increased appropriately. Therefore, through simulation calculation, the above dimensional relationship can achieve the best implementation effect.

[0079] It should be noted that the selection of fin spacing d and fin thickness t is the same as that for conventional heat exchanger fin spacing, mainly considering the manufacturing process. When the fins are arranged in a spiral shape, care should be taken to cover the beginning and end of the evaporator tubes 5.

[0080] Considering the heat exchange efficiency of the indoor heat exchanger, as shown in Figure 2, in order to ensure that the heat supplied in the evaporator tube 5 can be exchanged as much as possible, the fin height h of the heat exchange fin 6 is greater than the height of the evaporator tube assembly.

[0081] The selection of fin height h in this invention mainly considers the number of rows of evaporator tubes. The fin height should cover the evaporator tubes and leave an appropriate margin.

[0082] It should be noted that the selection of the number of rows of evaporator tubes 5 mainly depends on the heat exchange capacity. Due to structural limitations, the evaporator tubes 5 need to be folded back, therefore, the evaporator tubes 5 can only adopt an even number of rows, as shown in Figures 1-3. In this embodiment, a four-row layout of evaporator tubes 5 is illustrated. When the heat exchange capacity is large, a four-row layout can be used; when the heat exchange capacity is small, a two-row layout can be used. Around the outer periphery of the heat exchange fins 6, the main pipe is connected to each evaporator tube 5 and connected to the refrigerant inlet and outlet pipes, forming a complete evaporator tube loop.

[0083] The specifications for each part of the indoor heat exchanger are designed as follows:

[0084] When the outer diameter D1 of the axial fan 20 of the air conditioner is 300mm and the hub diameter D0 is 80mm, the distance D from the heat exchanger to the axial fan is 80mm. The inner diameter of the spiral of the heat exchange fin 6 can be taken as d0 = 1.1D0, which is 88mm, and the outer diameter of the spiral of the heat exchange fin 6 is d1 = 1.1D1 + 0.2D, which is 346mm. According to the previous heat exchanger fin manufacturing process, the fin spacing d can be selected as 1.5mm and the fin thickness t as 0.2mm. When four rows of evaporator tubes are used, the fin height h can be selected as 60mm. According to the required heat exchange, the number of evaporator tube groups can be selected as 60 groups, thus completing the overall design of the spiral heat exchanger.

[0085] As shown in Figures 1-5, in this embodiment, the evaporator assembly includes a refrigerant inlet manifold 3, a refrigerant outlet manifold 4, an evaporator 5, a refrigerant inlet pipe 1, and a refrigerant outlet pipe 2; wherein:

[0086] Both the refrigerant inlet manifold 3 and the refrigerant outlet manifold 4 are closed loop pipes;

[0087] Refrigerant inlet pipe 1 is connected to refrigerant inlet main pipe 3 and is used to input refrigerant;

[0088] Refrigerant outlet pipe 2 is connected to refrigerant outlet main pipe 4 for refrigerant output;

[0089] The number of evaporator tubes 5 is several groups, which are distributed in a radiating pattern at equal distances from the center of the indoor heat exchanger 30. Each group of evaporator tubes 5 forms an S-shaped structure with four rows of evaporator tubes 5. One end of each group of evaporator tubes 5 is connected to the refrigerant inlet main pipe 3, and the other end is connected to the refrigerant outlet main pipe 4.

[0090] It should be noted that, for the sake of simplicity and clarity of the images, only 12 sets of evaporator tubes 5 are shown in Figures 1-5, and the heat exchange fins 6 are arranged relatively sparsely. The specific heat exchange fin density and the number of evaporator tubes can be increased according to actual needs.

[0091] The heat exchange fins 6 of this utility model are spiral-shaped, allowing the spiral airflow at the axial fan outlet to pass through unimpeded, thus reducing wind resistance. At the same time, the spiral flow helps to increase the actual distance the airflow travels through the heat exchanger, improving the heat exchange efficiency and reducing the volume of the heat exchanger for the same amount of heat exchange. The heat exchanger fins are integral, reducing the stamping process.

[0092] As shown in Figures 1-5, as a further improvement of this utility model, it also includes a duct housing 10 and an axial fan 20; wherein:

[0093] The indoor heat exchanger 30 is connected to one end of the air duct housing 10;

[0094] The axial fan 30 is installed at the end of the duct housing 10 away from the indoor heat exchanger 30.

[0095] Furthermore, guide vanes are provided at the outlet of the axial fan 20.

[0096] It should be noted that guide vanes can be implemented using existing technologies to guide airflow. However, while the design of guide vanes can alleviate swirl, the effect is limited, and additional components will increase costs.

[0097] The indoor unit of this invention uses a spiral heat exchanger, which reduces flow resistance. When adapted to an axial fan, it reduces resistance by 35% compared to a traditional evaporator and improves heat exchange efficiency by 40%.

[0098] Example 3:

[0099] The present invention provides an air conditioner, including the indoor unit in Embodiment 2.

[0100] The indoor unit includes the aforementioned indoor heat exchanger 30.

[0101] As shown in Figures 2-5, the indoor heat exchanger 30 is a finned heat exchanger, including an evaporator tube assembly and heat exchange fins 6. The evaporator tube assembly is used to circulate the refrigerant. The heat exchange fins 6 are arranged in a spiral shape with the center of the indoor heat exchanger 30 as the center. The evaporator tube assembly is inserted into multiple turns of heat exchange fins 6. The heat exchange fins 6 are used to conduct heat exchange with the evaporator tube assembly and to contact the cooling airflow for contact heat exchange, thereby dissipating the heat in the refrigerant.

[0102] The finned heat exchanger provided by this utility model, by setting the heat exchange fins into a spiral structure, allows the spiral airflow from the axial fan outlet to pass through unobstructed, reducing wind resistance and solving the problem of mismatch between the airflow direction at the axial fan outlet and the airflow direction in the heat exchanger. At the same time, the spiral flow helps to increase the actual distance the airflow travels through the heat exchanger, improving the heat exchange efficiency and reducing the heat exchanger volume for the same heat exchange capacity. Compared with traditional evaporators, the resistance is reduced by 35% and the heat exchange effect is improved by 40%. The heat exchanger fins are integral, reducing the stamping process.

[0103] Furthermore, the spiral heat exchanger mainly comprises spirally arranged heat exchange fins 6 and evaporator tube assemblies. When implementing the spiral heat exchange fins 6, the following dimensions need to be considered: spiral inner diameter d0, spiral outer diameter d1, fin spacing d, fin thickness t, fin height h, distance D between the heat exchanger and the axial fan, and the number of evaporator tubes, etc. These will be explained in detail below.

[0104] It should be noted that, as shown in Figure 3, the heat exchange fin 6 is formed by spiral bending of a single plate. One end of the heat exchange fin 6 is located at the center of the spiral, and the other end is located on the outer side of the spiral. Considering the poor airflow swirling ability in the hub area of ​​the axial fan 20 outlet, in order to fully utilize the function of the indoor heat exchanger 30, improve heat exchange efficiency, and rationally specify the structure, in this embodiment, the spiral inner diameter d0 of the heat exchange fin is greater than the hub diameter D0 of the axial fan 20.

[0105] The selection of the spiral inner diameter d0 of this utility model mainly considers two factors: First, the hub diameter D0 of the axial fan hub. The downstream airflow swirl capability of the axial fan outlet hub area is poor, and the heat exchange effect of fins arranged here is limited. Second, considering the installation of the heat exchanger evaporator tube 5, the spiral inner diameter d0 should be greater than the hub radius D0.

[0106] As an optional embodiment of this utility model, as shown in Figures 1 and 4, the spiral inner diameter d0 of the heat exchange fin 6 is equal to 1-1.2 times the hub diameter D0 of the axial fan.

[0107] Through simulation calculations, the optimal embodiment was selected where the spiral inner diameter d0 of the heat exchange fins is equal to 1-1.2 times the hub diameter D0 of the axial fan, which can achieve the best effect.

[0108] In order to increase the heat exchanger area and improve the heat exchange efficiency, the outer diameter d1 of the heat exchange fin 6 is larger than the outer diameter D1 of the axial fan.

[0109] The selection of the spiral outer diameter d1 in this utility model mainly considers the outer diameter D1 of the axial fan and the distance D between the heat exchanger and the axial fan. The selection of D is mainly based on structural considerations, which need to ensure the size of the motor and the size of the motor bracket. The spiral outer diameter d1 should be appropriately larger than the outer diameter D1 of the axial fan, because the airflow at the outlet of the axial fan has a certain centrifugal tendency and a certain expansion state. Increasing the spiral outer diameter helps to increase the heat exchanger area and improve the heat exchange efficiency.

[0110] As an optional embodiment of this utility model, as shown in Figure 1, the spiral outer diameter d1 of the heat exchange fin 6 is equal to the outer diameter D1 of the axial fan plus 0.1-0.5 times the distance D between the heat exchanger and the axial fan.

[0111] When the distance D between the heat exchanger and the axial fan increases, the outer diameter d1 of the spiral should also be increased appropriately. Therefore, through simulation calculation, the above dimensional relationship can achieve the best implementation effect.

[0112] It should be noted that the selection of fin spacing d and fin thickness t is the same as that for conventional heat exchanger fin spacing, mainly considering the manufacturing process. When the fins are arranged in a spiral shape, care should be taken to cover the beginning and end of the evaporator tubes 5.

[0113] Considering the heat exchange efficiency of the indoor heat exchanger, as shown in Figure 2, in order to ensure that the heat supplied in the evaporator tube 5 can be exchanged as much as possible, the fin height h of the heat exchange fin 6 is greater than the height of the evaporator tube assembly.

[0114] The selection of fin height h in this invention mainly considers the number of rows of evaporator tubes. The fin height should cover the evaporator tubes and leave an appropriate margin.

[0115] It should be noted that the selection of the number of rows of evaporator tubes 5 mainly depends on the heat exchange capacity. Due to structural limitations, the evaporator tubes 5 need to be folded back, therefore, the evaporator tubes 5 can only adopt an even number of rows, as shown in Figures 1-3. In this embodiment, a four-row layout of evaporator tubes 5 is illustrated. When the heat exchange capacity is large, a four-row layout can be used; when the heat exchange capacity is small, a two-row layout can be used. Around the outer periphery of the heat exchange fins 6, the main pipe is connected to each evaporator tube 5 and connected to the refrigerant inlet and outlet pipes, forming a complete evaporator tube loop.

[0116] The specifications for each part of the indoor heat exchanger are designed as follows:

[0117] When the outer diameter D1 of the axial fan 20 of the air conditioner is 300mm and the hub diameter D0 is 80mm, the distance D from the heat exchanger to the axial fan is 80mm. The inner diameter of the spiral of the heat exchange fin 6 can be taken as d0 = 1.1D0, which is 88mm, and the outer diameter of the spiral of the heat exchange fin 6 is d1 = 1.1D1 + 0.2D, which is 346mm. According to the previous heat exchanger fin manufacturing process, the fin spacing d can be selected as 1.5mm and the fin thickness t as 0.2mm. When four rows of evaporator tubes are used, the fin height h can be selected as 60mm. According to the required heat exchange, the number of evaporator tube groups can be selected as 60 groups, thus completing the overall design of the spiral heat exchanger.

[0118] As shown in Figures 1-5, in this embodiment, the evaporator assembly includes a refrigerant inlet manifold 3, a refrigerant outlet manifold 4, an evaporator 5, a refrigerant inlet pipe 1, and a refrigerant outlet pipe 2; wherein:

[0119] Both the refrigerant inlet manifold 3 and the refrigerant outlet manifold 4 are closed loop pipes;

[0120] Refrigerant inlet pipe 1 is connected to refrigerant inlet main pipe 3 and is used to input refrigerant;

[0121] Refrigerant outlet pipe 2 is connected to refrigerant outlet main pipe 4 for refrigerant output;

[0122] The number of evaporator tubes 5 is several groups, which are distributed in a radiating pattern at equal distances from the center of the indoor heat exchanger 30. Each group of evaporator tubes 5 forms an S-shaped structure with four rows of evaporator tubes 5. One end of each group of evaporator tubes 5 is connected to the refrigerant inlet main pipe 3, and the other end is connected to the refrigerant outlet main pipe 4.

[0123] It should be noted that, for the sake of simplicity and clarity of the images, only 12 sets of evaporator tubes 5 are shown in Figures 1-5, and the heat exchange fins 6 are arranged relatively sparsely. The specific heat exchange fin density and the number of evaporator tubes can be increased according to actual needs.

[0124] The heat exchange fins 6 of this utility model are spiral-shaped, allowing the spiral airflow at the axial fan outlet to pass through unimpeded, thus reducing wind resistance. At the same time, the spiral flow helps to increase the actual distance the airflow travels through the heat exchanger, improving the heat exchange efficiency and reducing the volume of the heat exchanger for the same amount of heat exchange. The heat exchanger fins are integral, reducing the stamping process.

[0125] As shown in Figures 1-5, as a further improvement of this utility model, it also includes a duct housing 10 and an axial fan 20; wherein:

[0126] The indoor heat exchanger 30 is connected to one end of the air duct housing 10;

[0127] The axial fan 30 is installed at the end of the duct housing 10 away from the indoor heat exchanger 30.

[0128] Furthermore, guide vanes are provided at the outlet of the axial fan 20.

[0129] It should be noted that guide vanes can be implemented using existing technologies to guide airflow. However, while the design of guide vanes can alleviate swirl, the effect is limited, and additional components will increase costs.

[0130] The indoor unit of this invention uses a spiral heat exchanger, which reduces flow resistance. When adapted to an axial fan, it reduces resistance by 35% compared to a traditional evaporator and improves heat exchange efficiency by 40%.

[0131] The air conditioner of this utility model has a heat exchanger fin that is spiral-shaped, allowing the spiral airflow at the axial fan outlet to pass through unimpeded, thus reducing wind resistance. At the same time, the spiral flow helps to increase the actual distance the airflow travels through the heat exchanger, improving the heat exchange efficiency and reducing the volume of the heat exchanger for the same amount of heat exchange. The heat exchanger fins are integral, reducing the stamping process.

[0132] First, it should be noted that "inward" refers to the direction towards the center of the storage space, while "outward" refers to the direction away from the center of the storage space.

[0133] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in Figure 1, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0134] Furthermore, 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. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0135] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0136] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0137] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0138] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the protection scope of the claims.

Claims

1. An indoor unit heat exchanger, characterized in that, The heat exchanger is a finned heat exchanger, including an evaporator tube assembly and heat exchange fins; the heat exchange fins are arranged in a spiral shape with the center of the indoor unit heat exchanger as the center; the evaporator tube assembly passes through multiple turns of the heat exchange fins.

2. The indoor unit heat exchanger according to claim 1, characterized in that, The spiral inner diameter d0 of the heat exchange fins is greater than the hub diameter D0 of the axial fan.

3. The indoor unit heat exchanger according to claim 1, characterized in that, The spiral inner diameter d0 of the heat exchange fins is equal to 1-1.2 times the hub diameter D0 of the axial fan.

4. The indoor unit heat exchanger according to claim 1, characterized in that, The outer diameter d1 of the heat exchange fins is greater than the outer diameter D1 of the axial fan.

5. The indoor unit heat exchanger according to claim 1, characterized in that, The outer diameter d1 of the heat exchange fins is equal to the outer diameter D1 of the axial fan plus 0.1-0.5 times the distance D between the heat exchanger and the axial fan.

6. The indoor unit heat exchanger according to claim 1, characterized in that, The fin height h of the heat exchange fins is greater than the height of the evaporator tube assembly.

7. The indoor unit heat exchanger according to claim 1, characterized in that, The evaporator tube assembly includes a refrigerant inlet main pipe, a refrigerant outlet main pipe, evaporator tubes, a refrigerant inlet pipe, and a refrigerant outlet pipe; wherein: the refrigerant inlet main pipe and the refrigerant outlet main pipe are both closed-loop annular pipes; the refrigerant inlet pipe is connected to the refrigerant inlet main pipe; the refrigerant outlet pipe is connected to the refrigerant outlet main pipe; the number of evaporator tubes is several groups, which are distributed at equal distances in a divergent pattern with the center of the indoor unit heat exchanger as the center; each group of evaporator tubes is S-shaped, with one end connected to the refrigerant inlet main pipe and the other end connected to the refrigerant outlet main pipe.

8. An indoor unit, characterized in that, Including the indoor unit heat exchanger as described in any one of claims 1-7.

9. The indoor unit according to claim 8, characterized in that, It also includes a duct housing and an axial fan; wherein: the indoor unit heat exchanger is connected to one end of the duct housing; and the axial fan is installed at the end of the duct housing away from the indoor unit heat exchanger.

10. An air conditioner, characterized in that, Including the indoor unit as described in any one of claims 8-9.

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