Air duct structure and air conditioner indoor unit having the same

Abstract

The present invention provides an air duct structure and an air conditioner indoor unit having the same, the air duct structure comprising: an air duct extending along a first preset direction; a guide vane arranged in the air duct, the guide vane being fixed relative to the air duct; a fan blade arranged in the air duct, the fan blade being rotatably arranged along a first preset rotation direction; along the first preset direction, the fan blade has a first side and a second side arranged oppositely, the first side of the fan blade and / or the second side of the fan blade are provided with a guide vane, so as to convert the circumferential motion of the airflow into axial motion through the guide vane. The air duct structure of the present invention solves the problem of low fan efficiency in the air duct structure in the prior art.

Description

Technical Field

[0001] The present invention relates to the technical field of household appliances, and in particular to an air duct structure and an air conditioner indoor unit having the same. Background Art

[0002] In order to improve the energy utilization rate of air conditioners and improve human comfort, different air outlet methods are required in different modes. In cooling mode, cold air blows out from the top to achieve a shower-like cooling effect; in heating mode, hot air blows out from the bottom to achieve a carpet-like heating effect. Bath-like cooling and carpet-like heating can more efficiently utilize the gas's own properties and achieve higher energy utilization.

[0003] At present, the three most widely used fan blades in air-conditioning products on the market are centrifugal fan blades, crossflow fan blades and axial flow fan blades. Different fan blade forms need to be configured to meet the model development for different usage requirements and air inlet and outlet methods. However, there is no fan blade and its air duct that can switch the direction of airflow inlet and outlet only by changing the rotation direction of the fan blade, which makes the traditional air-conditioning air inlet only for air intake and air outlet only for air discharge. Although the existing distributed air supply technology can realize air supply from the upper and lower air outlets, the lower air outlet (upper air outlet) will also blow out cold air (hot air) during cooling (heating), and the energy utilization rate cannot be optimized. Therefore, there is an urgent need for a duct technology that can realize the switching of the direction of airflow inlet and outlet, so that in cooling mode, air enters from the lower air outlet and blows out from the upper air outlet; in heating mode, air enters from the upper air outlet and blows out from the lower air outlet, so that the energy conversion rate is more efficient and human comfort is improved at the same time.

[0004] In addition, the existing air duct structure causes large vortex losses between air flows, low fan efficiency, and small air output. Summary of the invention

[0005] The main purpose of the present invention is to provide an air duct structure and an air conditioner indoor unit having the same, so as to solve the problem of low fan efficiency in the air duct structure in the prior art.

[0006] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, there is provided an air duct structure, comprising: an air duct, which extends along a first preset direction; a guide vane, which is arranged in the air duct and is fixed relative to the air duct; a fan blade, which is arranged in the air duct and is rotatable along a first preset rotation direction; along the first preset direction, the fan blade has a first side and a second side which are arranged opposite to each other, and the first side of the fan blade and / or the second side of the fan blade are provided with a guide vane to convert the circumferential motion of the airflow into axial motion through the guide vane.

[0007] Furthermore, there are multiple fan blades, and the multiple fan blades are arranged at intervals along the first preset direction.

[0008] Furthermore, the air duct has a first vent and a second vent that are relatively arranged; there are multiple fan blades and multiple guide vanes, and the multiple guide vanes are arranged one-to-one corresponding to the multiple fan blades, and each guide vane is arranged on a side of the corresponding fan blade close to the first vent, or each guide vane is arranged on a side of the corresponding fan blade close to the second vent.

[0009] Furthermore, the air duct extends in a vertical direction, and the air duct includes a primary air duct and a secondary air duct, the secondary air duct is connected to the primary air duct and is arranged above the primary air duct; the multiple fan blades include primary fan blades and secondary fan blades, the multiple guide vanes include primary guide vanes and secondary guide vanes, the primary fan blades and the primary guide vanes are arranged in the primary air duct, and the secondary fan blades and the secondary guide vanes are arranged in the secondary air duct; wherein, the primary guide vanes are arranged above the primary fan blades, and the secondary guide vanes are arranged above the secondary fan blades.

[0010] Furthermore, the primary fan blades and the secondary fan blades are both connected to the rotating shaft, and the rotating shaft is rotatably arranged to drive the primary fan blades and the secondary fan blades to rotate synchronously.

[0011] Furthermore, the air duct structure also includes a first driving device and a second driving device, the first driving device is drivingly connected to the primary fan blades, and the second driving device is drivingly connected to the secondary fan blades.

[0012] Further, the guide vane includes a guide vane connection portion and a plurality of guide vane blades, the plurality of guide vane blades are all connected to the guide vane connection portion, and the plurality of guide vane blades are arranged at circumferential intervals around the guide vane connection portion.

[0013] Furthermore, one end of the guide vane blade away from the guide vane connecting portion contacts the inner wall of the air duct.

[0014] Furthermore, the guide vane blade is a flat blade or a curved blade.

[0015] Furthermore, the fan blade includes a first end and a second end that are arranged opposite to each other, and the fan blade includes a fan blade hub and a plurality of fan blades. The plurality of fan blades are all connected to the fan blade hub, and the plurality of fan blades are arranged at intervals around the circumference of the fan blade hub.

[0016] Furthermore, a splitter blade is provided between two adjacent fan blades, and the splitter blade is connected to the fan blade hub.

[0017] According to another aspect of the present invention, an air conditioner indoor unit is provided, comprising an air duct structure, wherein the air duct structure is the above-mentioned air duct structure.

[0018] The air duct structure of the present invention includes guide vanes, which can convert the circumferential motion of the airflow into axial motion. The air duct structure is provided with guide vanes on the first side of the fan blades and / or the second side of the fan blades, which can achieve the effect of rectifying the airflow between the fan blades, reduce eddy current losses between the airflow, and improve the efficiency of the fan. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0020] Figure 1 A front view of the air duct structure according to the present invention in a bottom-in, top-out air supply mode is shown;

[0021] Figure 2 A cross-sectional view of the air duct structure according to the present invention in a bottom-in and top-out air supply mode is shown;

[0022] Figure 3 It shows a schematic structural diagram of the air duct structure according to the present invention in a top-in and bottom-out air supply mode;

[0023] Figure 4 A cross-sectional view of the air duct structure according to the present invention in a top-in and bottom-out air supply mode is shown;

[0024] Figure 5 A three-dimensional diagram of the air duct structure according to the present invention in a bottom-in and top-out air supply mode is shown;

[0025] Figure 6 A three-dimensional diagram of the air duct structure according to the present invention in a top-in and bottom-out air supply mode is shown;

[0026] Figure 7 A perspective view showing a guide vane of an air duct structure according to the present invention;

[0027] Figure 8 A perspective view showing an embodiment of a fan blade of the wind duct structure according to the present invention;

[0028] Fig. 9 A front view of an embodiment of a fan blade of the wind duct structure according to the present invention is shown;

[0029] Fig.10 A perspective view showing another embodiment of a wind blade of the wind duct structure according to the present invention;

[0030] Fig.11 A front view showing another embodiment of a fan blade of the wind duct structure according to the present invention;

[0031] Fig.12 It shows the flow direction of the airflow in the fan blade when the air duct structure according to the present invention is in the bottom-in and top-out air supply mode;

[0032] Fig.13 The figure shows the flow direction of the airflow in the fan blade when the air duct structure according to the present invention is in the top-in and bottom-out air supply mode.

[0033] The above drawings include the following reference numerals:

[0034] 10. Air duct; 11. First vent; 12. Second vent; 13. Primary air duct; 14. Secondary air duct; 20. Primary fan blade; 30. Secondary fan blade; 40. Primary guide vane; 50. Secondary guide vane; 61. Guide vane connection; 62. Guide vane blade; 71. Fan blade hub; 72. Fan blade; 73. Diverter blade. DETAILED DESCRIPTION

[0035] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0036] It should be noted that the following detailed descriptions are illustrative and are intended to provide further explanation of the present application. Unless otherwise specified, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art to which the present application belongs.

[0037] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0038] The present invention provides a duct structure, please refer to Figures 1 to 13 , including: an air duct 10, the air duct 10 extends along a first preset direction; a guide vane, arranged in the air duct 10, the guide vane is fixed relative to the air duct 10; a fan blade, arranged in the air duct 10, the fan blade is rotatable along a first predetermined rotation direction; along the first preset direction, the fan blade has a first side and a second side arranged opposite to each other, and the first side of the fan blade and / or the second side of the fan blade are provided with a guide vane to convert the circumferential motion of the airflow into axial motion through the guide vane.

[0039] The air duct structure of the present invention includes guide vanes, which can convert the circumferential motion of the airflow into axial motion. The air duct structure is provided with guide vanes on the first side of the fan blades and / or the second side of the fan blades, which can achieve the effect of rectifying the airflow between the fan blades, reduce eddy current losses between the airflow, and improve the efficiency of the fan.

[0040] In specific implementation, after the airflow passes through the fan blades of the present invention, axial airflow, radial airflow and circumferential airflow will be generated. The circumferential airflow will generate vortices in the air duct, and then generate vortex losses. The circumferential motion of the airflow is converted into axial motion through the guide vanes, and part of the radial airflow is converted into axial motion airflow, which plays a role of rectification.

[0041] In this embodiment, there are multiple blades, and the multiple blades are arranged at intervals along the first preset direction. Such an arrangement can greatly increase the air volume and achieve a pressure-boosting effect.

[0042] In this embodiment, the air duct 10 has a first vent 11 and a second vent 12 which are arranged relatively to each other; there are multiple fan blades and multiple guide vanes, and the multiple guide vanes are arranged one by one corresponding to the multiple fan blades, and each guide vane is arranged on a side of the corresponding fan blade close to the first vent 11, or each guide vane is arranged on a side of the corresponding fan blade close to the second vent 12.

[0043] In one embodiment, the air duct 10 extends in a vertical direction, and the air duct 10 includes a primary air duct 13 and a secondary air duct 14, the secondary air duct 14 is connected to the primary air duct 13 and is arranged above the primary air duct 13; the multiple fan blades include a primary fan blade 20 and a secondary fan blade 30, and the multiple guide vanes include a primary guide vane 40 and a secondary guide vane 50, the primary fan blade 20 and the primary guide vane 40 are arranged in the primary air duct 13, and the secondary fan blade 30 and the secondary guide vane 50 are arranged in the secondary air duct 14; wherein, the primary guide vane 40 is arranged above the primary fan blade 20, and the secondary guide vane 50 is arranged above the secondary fan blade 30.

[0044] In one embodiment, in order to realize the rotation of the primary fan blades 20 and the secondary fan blades 30, the primary fan blades 20 and the secondary fan blades 30 are both connected to a rotating shaft, and the rotating shaft is rotatably arranged to drive the primary fan blades 20 and the secondary fan blades 30 to rotate synchronously. Among them, the air duct structure also includes a third driving device, which is drivingly connected to the rotating shaft.

[0045] In another embodiment, the air duct structure further includes a first driving device and a second driving device, wherein the first driving device is drivingly connected to the primary fan blades 20 , and the second driving device is drivingly connected to the secondary fan blades 30 .

[0046] During specific implementation, the primary fan blades 20 and the secondary fan blades 30 may rotate at the same speed or at a differential speed.

[0047] In this embodiment, the guide vane includes a guide vane connection portion 61 and a plurality of guide vane blades 62 . The plurality of guide vane blades 62 are all connected to the guide vane connection portion 61 , and the plurality of guide vane blades 62 are arranged at intervals in the circumferential direction of the guide vane connection portion 61 .

[0048] In one embodiment, one end of the guide vane blade 62 away from the guide vane connecting portion 61 contacts the inner wall of the air duct 10. Such an arrangement has a better rectifying effect.

[0049] In another embodiment, a gap is provided between an end of the guide vane blade 62 away from the guide vane connecting portion 61 and the inner wall of the air duct 10 .

[0050] In a specific implementation, the guide vane blade 62 is a flat blade or a curved blade. When the guide vane blade 62 is a curved blade, it can achieve the effect of pre-swirl the airflow.

[0051] In this embodiment, the fan blade includes a first end and a second end that are relatively arranged, and the fan blade includes a fan blade hub 71 and a plurality of fan blades 72, and the plurality of fan blades 72 are all connected to the fan blade hub 71, and the plurality of fan blades 72 are arranged at intervals around the circumference of the fan blade hub 71; wherein a diverter blade 73 is arranged between two adjacent fan blades 72, and the diverter blade 73 is connected to the fan blade hub 71. In a specific implementation, there is a guide channel between two adjacent fan blades 72, so that the airflow flows out from the circumference of the guide channel. The centrifugal effect of the fan blade is enhanced, and the airflow can flow from the first side of the fan blade to the second side, and can also flow from the second side of the fan blade to the first side; in addition, the arrangement of the diverter blade 73 avoids the generation of vortices when the interval between the two fan blades is large.

[0052] The splitter blade 73 extends from the first end of the fan blade toward the second end.

[0053] During specific implementation, the fan blade of the present invention is also the novel mixed flow fan blade described below, and the air duct structure is also the two-stage mixed flow air duct described below.

[0054] The inventive point of the air duct structure of the present invention is: using a new type of mixed flow fan blade (the mixed flow fan blade has no fan blade outer ring), placing two fan blades in the air duct in the same direction respectively, and by adjusting the rotation direction of the fan blade and matching the corresponding air duct profile, the two modes of switching the inlet and outlet directions of the airflow can be realized, namely, bottom-in-top-out and top-in-bottom-out. At the same time, two guide vanes are placed above the primary fan blade and the secondary fan blade respectively. The guide vanes added between the primary fan blade and the secondary fan blade can have the effect of rectifying the airflow between the fan blades; the guide vanes added at the upper end of the secondary fan blade can respectively have the effect of outlet rectification and inlet pre-rotation in two modes. The added guide vanes can convert the airflow direction from circumferential motion to axial motion, reduce the vortex loss between the airflow, greatly improve the efficiency of the fan, and increase the air output.

[0055] In specific implementation, the duct line can be changed. When the airflow enters from the bottom and exits from the top, the duct line changes to Figure 1 and Figure 2 As shown, when the airflow enters from the top and exits from the bottom, the duct line changes to Figure 3 and Figure 4 shown.

[0056] The specific implementation of the present invention is:

[0057] The two-stage mixed flow duct can switch the inlet and outlet directions of the airflow to achieve two air supply modes: up-in and down-out or down-in and up-out. The new mixed flow fan blade has a wide blade and no outer sealing ring. It is available in two forms: with splitter blades and without splitter blades. The fan blade can achieve two effects in the axial direction and the centrifugal direction during its working process. Figures 1 to 4 The air duct structure shown can realize two air supply modes: top-in and bottom-out or bottom-in and top-out.

[0058] In cooling mode, the air conditioner adopts the bottom-in and top-out air supply mode, such as Figure 1 and 2 As shown, at this time, both levels of blades rotate counterclockwise (top view). The airflow enters from the lower end of the first-stage duct blade, blows out from the first-stage blade, and passes through the first-stage guide vane. The first-stage guide vane can rectify the airflow blown out from the first-stage blade, converting the circumferential motion of the airflow into axial motion to reduce eddy current loss between airflows. The rectified airflow enters the secondary air duct from the lower end of the secondary blade, and after the secondary blade does work twice, it blows out from the upper end of the secondary blade and passes through the secondary guide vane for secondary rectification before blowing out of the air duct, thus realizing the bottom-in and top-out air supply mode. The flow direction of the airflow inside the blade can be seen in Fig.12 Upward airflow direction shown.

[0059] In heating mode, the air conditioner adopts the top-in and bottom-out air supply mode, such as Figure 3 and Figure 4 As shown, at this time, both stages of the fan blades rotate clockwise (top view). After the airflow enters the air duct from the constriction of the secondary air duct, it first passes through the secondary guide vanes. At this time, the guide vanes play a dual role of inlet pre-swirl and rectification. After the secondary fan blades work, it passes through the primary guide vanes. The primary guide vanes can rectify the airflow blown out from the secondary fan blades, converting the circumferential motion of the airflow into axial motion to reduce eddy current losses between airflows. The rectified airflow enters the primary air duct from the upper end of the primary fan blades. After the primary fan blades work twice, it is finally blown out of the air duct from the lower end of the primary fan blades, realizing a top-in, bottom-out air supply mode. The flow direction of the airflow inside the fan blades can be seen. Fig.13 Downward airflow direction shown.

[0060] Two new mixed flow fans are arranged in the upper and lower parts of the two-stage mixed flow duct. The fans include blades and motors. The fans are placed in the same direction. This method can increase the working capacity of the blades. The guide vane structure added between the primary blades and the secondary blades can achieve the effect of airflow rectification between the blades. The guide vane structure added at the upper end of the secondary blades can achieve the effects of outlet rectification and inlet pre-rotation in two modes. The added guide vane structure can change the airflow direction from circumferential motion to axial motion, reduce vortex losses between airflows, greatly improve fan efficiency, and increase air output.

[0061] The two-stage mixed flow air duct can realize the secondary working process of the fan, which can increase the working capacity of the entire fan. Taking the bottom-in and top-out as an example, after the first-stage fan blades work, they are rectified by the first-stage guide vanes, which can reduce the eddy loss between the airflows. After that, the secondary work of the secondary fan blades can greatly improve the working capacity of the fan, and the two-stage mixed flow air duct can also play a secondary pressurization effect. Therefore, the two-stage mixed flow air duct with the guide vane structure can greatly increase the air output and reduce the energy loss of the fan. At the same time, its greater pressurization effect can overcome greater resistance, and it is applied to air conditioners with two air supply modes of top-in and bottom-out or bottom-in and top-out, with significant results.

[0062] In specific implementation, the bottom-in-top-out air supply mode is not limited to the cooling mode, and the top-in-bottom-out air supply mode is not limited to the heating mode; the two-stage mixed flow air duct technology is not limited to the air-conditioning industry.

[0063] The air duct structure of the present invention solves:

[0064] 1. Air duct technology that can switch the inlet and outlet directions of airflow.

[0065] 2. Compared with the single-stage mixed flow duct, the two-stage mixed flow duct can greatly increase the air volume and achieve the effect of secondary pressurization.

[0066] 3. Adding a guide vane structure between the two-stage mixed flow duct can change the airflow direction from circumferential motion to axial motion, reduce eddy current losses between airflows, and improve fan efficiency.

[0067] The present invention further provides an air conditioner indoor unit, comprising an air duct structure, wherein the air duct structure is the air duct structure in the above embodiment.

[0068] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0069] The air duct structure of the present invention includes guide vanes, which can convert the circumferential motion of the airflow into axial motion. The air duct structure is provided with guide vanes on the first side of the fan blades and / or the second side of the fan blades, which can achieve the effect of rectifying the airflow between the fan blades, reduce eddy current losses between the airflow, and improve the efficiency of the fan.

[0070] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein, for example. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0071] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0072] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An air duct structure, characterized in that: include: An air duct (10), wherein the air duct (10) extends along a first preset direction: A guide vane is arranged in the air duct (10), and the guide vane is fixedly arranged relative to the air duct (10); A fan blade is arranged in the air duct (10), the fan blade being rotatably arranged along a first predetermined rotation direction; along the first predetermined direction, the fan blade has a first side and a second side arranged opposite to each other, and the first side of the fan blade and / or the second side of the fan blade are provided with the guide vane so as to convert the circumferential motion of the airflow into axial motion through the guide vane; The air duct (10) has a first ventilation opening (11) and a second ventilation opening (12) which are arranged opposite to each other; there are a plurality of fan blades, and there are a plurality of guide vanes, and the plurality of guide vanes are arranged in one-to-one correspondence with the plurality of fan blades, and each guide vane is arranged on a side of the corresponding fan blade close to the first ventilation opening (11), or each guide vane is arranged on a side of the corresponding fan blade close to the second ventilation opening (12); The air duct (10) extends in a vertical direction, the air duct (10) comprises a primary air duct (13) and a secondary air duct (14), the secondary air duct (14) being connected to the primary air duct (13) and arranged above the primary air duct (13); the plurality of fan blades comprise primary fan blades (20) and secondary fan blades (30), the plurality of guide vanes comprise primary guide vanes (40) and secondary guide vanes (50), the primary fan blades (20) and the primary guide vanes (40) being arranged in the primary air duct (13), and the secondary fan blades (30) and the secondary guide vanes (50) being arranged in the secondary air duct (14); Wherein, the primary guide vane (40) is arranged above the primary fan blade (20), and the secondary guide vane (50) is arranged above the secondary fan blade (30); The primary fan blades (20) and the secondary fan blades (30) are both connected to a rotating shaft, and the rotating shaft is rotatably arranged to drive the primary fan blades (20) and the secondary fan blades (30) to rotate synchronously.

2. The air duct structure according to claim 1, characterized in that: There are a plurality of fan blades, and the plurality of fan blades are arranged at intervals along a first preset direction.

3. The air duct structure according to claim 1, characterized in that: The air duct structure further comprises a first driving device and a second driving device, wherein the first driving device is drivingly connected to the primary fan blades (20), and the second driving device is drivingly connected to the secondary fan blades (30).

4. The air duct structure according to claim 1, characterized in that: The guide vane comprises a guide vane connecting portion (61) and a plurality of guide vane blades (62); the plurality of guide vane blades (62) are all connected to the guide vane connecting portion (61); and the plurality of guide vane blades (62) are arranged at intervals in the circumferential direction of the guide vane connecting portion (61).

5. The air duct structure according to claim 4, characterized in that: One end of the guide vane blade (62) away from the guide vane connecting portion (61) is in contact with the inner wall of the air duct (10).

6. The air duct structure according to claim 4, characterized in that: The guide vane blade (62) is a flat blade or a curved blade.

7. The air duct structure according to claim 1, characterized in that: The fan blade comprises a first end and a second end which are arranged opposite to each other, and the fan blade comprises a fan blade hub (71) and a plurality of fan blades (72). The plurality of fan blades (72) are all connected to the fan blade hub (71), and the plurality of fan blades (72) are arranged at intervals in the circumferential direction around the fan blade hub (71).

8. The air duct structure according to claim 7, characterized in that: A splitter blade (73) is provided between two adjacent fan blades (72), and the splitter blade (73) is connected to the fan blade hub (71).

9. An air conditioner indoor unit, comprising an air duct structure, characterized in that: The air duct structure is the air duct structure according to any one of claims 1 to 8.

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