Air duct structure and air conditioner cabinet

Abstract

The present disclosure relates to an air duct structure and an air conditioner cabinet in the technical field of air conditioners. The air duct structure comprises: a main air duct, a fan, an air discharge frame, and a grille. The grille is mounted between an air discharge end of the main air duct and the air discharge frame. An airflow in the main air duct comes into contact with the grille while flowing, and the grille breaks up vortices. The airflow blown out from the main air duct passes through the grille and then is blown to the air discharge frame, reducing the pressure difference between the main air duct and the air discharge frame, making the air discharge smoother and thereby helping eliminate abnormal sound. In one aspect, the mounting position of the grille can effectively break up vortex regions; in another aspect, the mounting position of the grille facilitates a mounting operation for the grille. The mounting position of the grille arranged between the air discharge frame and the air discharge end facilitates operations, and there is no need to add an additional positioning member in the interior of the air duct to fix the grille; instead, the grille only needs to be directly connected to a lower side of the air discharge frame or an upper side of the air discharge end, which helps to increase the smoothness of an air cavity in the main air duct and reduce the air resistance in the air cavity.

Description

Duct structure and air conditioning unit

[0001] Cross-references to related applications

[0002] This disclosure is based on and claims priority to Chinese Patent Application No. 202411552746.3, filed on November 1, 2024, the contents of which are incorporated herein by reference in their entirety. Technical Field

[0003] This disclosure relates to the field of air conditioning technology, and in particular to an air duct structure and an air conditioning unit. Background Technology

[0004] In the related air duct structure technology of cabinet air conditioners, such as air outlet from top to bottom or from bottom to top, uneven air outlet and abnormal noise often occur.

[0005] This problem is even more pronounced for air conditioners with reversible airflow. Summary of the Invention

[0006] The technical problem to be solved by this disclosure is that abnormal noise is caused by turbulent flow field in the air duct structure of air conditioner cabinet units in related technologies. This disclosure provides an air duct structure and an air conditioner cabinet unit.

[0007] The first aspect of the embodiments of this disclosure provides an air duct structure, including:

[0008] The main air duct has an air cavity and an air inlet and an air outlet communicating with the air cavity;

[0009] A fan is installed in the air cavity of the main air duct. When the fan is working, airflow enters along the air inlet and exits through the air outlet.

[0010] An air outlet frame is provided at the air outlet end, and the air outlet area of ​​the air outlet frame is larger than the air outlet area of ​​the main air duct.

[0011] A grille is disposed between the air outlet frame and the air outlet end.

[0012] In some embodiments, the grille includes a plurality of first grille bars and a plurality of second grille bars;

[0013] The plurality of first grid strips are arranged at intervals along a first direction;

[0014] The plurality of second grid strips are arranged at intervals along a second direction;

[0015] The first direction intersects with the second direction, and the plurality of first grid strips and the plurality of second grid strips form a mesh structure.

[0016] In some embodiments, the plurality of first grid bars and the plurality of second grid bars are both configured as curved grid bars.

[0017] In some embodiments, both the first grille bar and the second grille bar include a grille bar body;

[0018] The grid bar body has a head located on the airflow inflow side and a tail located on the airflow outflow side. The width of the cross section of the head gradually increases along the airflow direction, and the width of the cross section of the tail gradually decreases along the airflow direction. The airflow direction is from the airflow inflow side to the airflow outflow side.

[0019] In some embodiments, the cross-section of the grid bar body has a maximum width in the fluid flow direction, the portion extending from the location of the maximum width in the fluid outflow direction is the tail, and the portion extending from the location of the maximum width in the fluid inflow direction is the head.

[0020] The cross-section of the grille bar body has a shape that is wide in the middle and narrow at both ends, wherein the length of the cross-section of the head is h1 and the length of the cross-section of the tail is h2; wherein h2≥h1.

[0021] In some embodiments, the cross-section of the grille bar body is a double trapezoidal surface, wherein the cross-section portion corresponding to the head forms a first trapezoidal surface, and the cross-section portion corresponding to the tail forms a second trapezoidal surface, wherein the long side of the first trapezoidal surface and the long side of the second trapezoidal surface share the same side, the short side of the first trapezoidal surface forms a partial outline of the head, and the short side of the second trapezoidal surface forms a partial outline of the tail.

[0022] The width of the short side of the first trapezoidal surface is t1, the width of the short side of the second trapezoidal surface is t2, and the width of the long side of the first trapezoidal surface and the second trapezoidal surface is t, where t > t1 and t > t2;

[0023] The length of the head is the distance from the short side to the long side of the first trapezoidal surface, which is h1; the length of the tail is the distance from the short side to the long side of the second trapezoidal surface, which is h2.

[0024] Where h2≥h1.

[0025] In some embodiments, 2mm ≤ t ≤ 5mm; and / or 4mm ≤ h1 + h2 ≤ 10mm.

[0026] In some embodiments, the surface of the grille bar body has a windward side and a leeward side separated by the maximum width, the windward side including a first windward side, a second windward side and a third windward side, and the leeward side including a first leeward side, a second leeward side and a third leeward side.

[0027] The first windward surface has a chamfered corner between itself and the second and third windward surfaces, and the first leeward surface has a chamfered corner between itself and the second and third leeward surfaces.

[0028] In some embodiments, the fan is a centrifugal fan, and the distance between the wall of the grille near the fan and the center of the fan axis is t3, wherein 400mm≤t3≤700mm.

[0029] A second aspect of this disclosure provides an air conditioning unit, comprising:

[0030] The air duct structure of the above embodiment.

[0031] The solution provided in this disclosure has the following advantages compared with related technologies:

[0032] By installing the grille between the air outlet and the air outlet frame of the main air duct, the airflow in the main air duct comes into contact with the grille during its flow. The grille breaks up the vortex, and the airflow blown out from the main air duct passes through the grille before being blown to the air outlet frame, reducing the pressure difference between the two and making the airflow smoother, thereby effectively eliminating abnormal noise.

[0033] Installing the grille between the air outlet and the air outlet frame of the main air duct can effectively disperse the vortex zone and make the installation operation of the grille easier. Compared with installing the grille inside the air duct, the installation position between the air outlet and the air outlet frame of the main air duct is easier to operate, and there is no need to add additional positioning parts inside the air duct to fix the grille. The grille can be directly connected to the lower side of the air outlet frame or the upper side of the air outlet, which helps to increase the unobstructed flow of the air cavity in the main air duct and reduce the air resistance of the air cavity. Attached Figure Description

[0034] The accompanying drawings, as part of this disclosure, are provided to further illustrate the present disclosure. The illustrative embodiments and descriptions of the present disclosure are used to explain the present disclosure, but do not constitute an undue limitation thereof. Obviously, the drawings described below are merely some embodiments, and those skilled in the art can obtain other drawings based on these drawings without creative effort. In the drawings:

[0035] Figure 1 is an exploded view of the air duct structure shown in an embodiment of this disclosure;

[0036] Figure 2 is one of the cross-sectional views of the air duct structure shown in the embodiment of this disclosure;

[0037] Figure 3 is a second cross-sectional view of the air duct structure shown in an embodiment of this disclosure;

[0038] Figure 4 is a schematic diagram of the grid structure shown in an embodiment of this disclosure;

[0039] Figure 5 is a top view of the connection state between the grille and the air outlet frame shown in an embodiment of this disclosure;

[0040] Figure 6 is a schematic diagram of the first grid bar structure shown in an embodiment of this disclosure;

[0041] Figure 7 is a schematic cross-sectional view of the first grid bar shown in an embodiment of this disclosure;

[0042] Figure 8 is a comparative example of the flow field simulation diagram of the duct structure without the grid installed in this disclosure;

[0043] Figure 9 is a simulation diagram of the flow field of the duct structure with installed grid according to an embodiment of this disclosure.

[0044] In the diagram: 10-First grille bar; 11-Second grille bar; 1011-Head; 1012-Tail; 2-Frame; 4-Main air duct; 401-Vortex; 402-Vortex cover; 403-Fan; 5-Outlet frame; 6-Grill; 7-Inlet; 8-Outlet; 901-First windward side; 902-Second windward side; 903-Third windward side; 111-First leeward side; 112-Second leeward side; 113-Third leeward side.

[0045] It should be noted that these accompanying drawings and textual descriptions are not intended to limit the scope of the present disclosure in any way, but rather to illustrate the concepts of the present disclosure to those skilled in the art by referring to specific embodiments. Detailed Implementation

[0046] In the description of this disclosure, it should be noted that the terms "inner" and "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this disclosure and simplifying the description, and do not 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 disclosure.

[0047] In the description of this disclosure, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," "contact," and "communication" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this disclosure based on the specific circumstances.

[0048] Through whole-unit fluid simulation, we found that the root cause of uneven airflow, abnormal noise, and other issues in floor-standing air conditioners lies in the large vortex area at the connection between the air duct and the air outlet frame. This vortex causes turbulent airflow from the air duct, resulting in uneven airflow and abnormal noise. Based on this, we propose installing a grille at the connection between the air duct and the air outlet frame to rectify the airflow from the air outlet end of the air duct to the air outlet frame. This has the advantages of reducing internal vortices and lowering flow resistance. Floor-standing air conditioners with this grille installed achieve both reduced noise and reduced airflow attenuation.

[0049] As shown in Figures 1-3, this embodiment provides an air duct structure, including:

[0050] The main air duct 4 forms an air cavity and an air inlet 7 and an air outlet 8 connected to the air cavity;

[0051] Fan 403 is installed in the air cavity of the main air duct 4. When the fan 403 is working, the airflow enters along the air inlet 7 and is discharged through the air outlet 8.

[0052] Air outlet frame 5 is located at the air outlet end 8, and the air outlet area of ​​the air outlet frame 5 is larger than the air outlet area of ​​the main air duct 4.

[0053] Grille 6 is located between the air outlet frame 5 and the air outlet end 8.

[0054] In this embodiment, the duct structure can be used inside an air conditioning unit. The air outlet frame 5 is connected to the air outlet end 8 of the main air duct 4 to increase the air outlet area of ​​the main air duct 4. That is, the air outlet area of ​​the air outlet frame 5 is larger than the air outlet area of ​​the air outlet end 8. By setting the air outlet frame 5 to amplify the air outlet of the main air duct 4, the air volume is increased. However, at the amplification point, that is, at the junction of the main air duct 4 and the air outlet frame 5, there will be a pressure difference at both ends of the junction due to the different air outlet cross sections. This can easily lead to airflow turbulence, resulting in uneven air outlet noise, as shown in Figure 8. From the fluid simulation diagram inside the duct, it can be seen that the air... There is a large vortex area at the connection between the duct and the air outlet frame, which is shown by the dotted line in Figure 8. This causes turbulence in the airflow blown out of the main duct 4, resulting in uneven airflow and abnormal noise from the air conditioner. By installing the grille 6 between the air outlet end 8 and the air outlet frame 5 of the main duct 4, the airflow in the main duct 4 comes into contact with the grille 6 during its flow. The grille 6 disperses the vortex, as shown in Figure 9, which is a simulation diagram of the fluid in the duct after the grille 6 is installed. The airflow blown out of the main duct 4 passes through the grille 6 and then blows onto the air outlet frame 5, reducing the pressure difference between the two and making the airflow smoother, thereby effectively eliminating noise.

[0055] In existing duct structures, grilles are generally installed inside the duct. In this embodiment, grille 6 is installed between the air outlet 8 and the air outlet frame 5 of the main air duct 4. This not only effectively disperses the vortex zone but also facilitates the installation of grille 6. Specifically, the installation of grille 6 is performed on the upper side of the air outlet 8 or the lower side of the air outlet frame 5. For example, grille 6 is first connected to the lower end of the air outlet frame 5, forming a first pre-assembled component. This first pre-assembled component is then installed on the upper end of the air outlet 8. Alternatively, grille 6 can be installed on the upper end of the air outlet 8. Connected to the upper end of the air outlet 8, the grille 6 and the main air duct 4 form a second pre-assembled component. The air outlet frame 5 is then installed on the upper end of the second pre-assembled component. Compared to installing the grille 6 inside the air duct, installing the grille 6 between the air outlet 8 and the air outlet frame 5 of the main air duct 4 is easier to operate. It also eliminates the need to add additional positioning components inside the air duct to fix the grille 6. Instead, the grille 6 can be directly connected to the lower side of the air outlet frame 5 or the upper side of the air outlet 8, which helps to increase the unobstructed flow of the air cavity inside the main air duct 4 and reduce the air resistance of the air cavity.

[0056] In this embodiment, the air inlet and outlet directions in the air duct structure are not limited. The air duct structure can be bottom air inlet and top air outlet, top air inlet and bottom air outlet, or side air inlet and top air outlet. As long as the grille 6 is installed between the air outlet end 8 of the main air duct 4 and the air outlet frame 5 at the air outlet position in the air duct structure, noise can be eliminated and installation can be convenient.

[0057] In some embodiments, as shown in Figures 4 and 5, the grille 6 includes a plurality of first grille bars 10 and a plurality of second grille bars 11;

[0058] Multiple first grid strips 10 are arranged at intervals along a first direction;

[0059] Multiple second grid strips 11 are arranged at intervals along a second direction;

[0060] The first direction intersects with the second direction, and multiple first grid strips 10 and multiple second grid strips 11 form a mesh structure.

[0061] For example, a grille 6 is composed of a first grille bar 10, a second grille bar 11, and a frame 2. A fixing seat is connected to the outside of the frame 2, which facilitates the fixed assembly of the frame 2 and the air outlet frame 5. As shown in Figure 5, the grille 6 is installed at the bottom of the air outlet frame 5 and fixed to the air outlet frame 5 with four screws. The bottom of the air outlet frame 5 is fixed to the air outlet of the main air duct 4 with screws, and the grille 6 is located at the connection between the air outlet frame 5 and the main air duct 4.

[0062] The first grille bar 10, as a longitudinal spoke in the grille 6, is fixedly connected to the inside of the frame 2. The second grille bar 11, as a transverse spoke in the grille 6, is fixedly connected between two adjacent first grille bars 10. A straight grille bar layout or a curved grille bar layout can be selected based on the fluid velocity characteristics. The distance between each grille bar, i.e., the density of the grille 6, can be optimized by adjusting the overall installation position of the grille 6 and the overall flow field parameters. For different airflow directions, the grille 6 can be arranged densely or sparsely according to actual needs to better rectify the flow and change the airflow direction, thereby improving the flow field and reducing noise.

[0063] The grille 6 effectively guides the flow field within the duct structure, reducing the vortex area inside the air conditioning unit's duct. At the same fan speed, setting the grille 6 helps increase the air volume and also helps eliminate abnormal noise.

[0064] In some embodiments, as shown in Figures 4 and 6, the first grid bar 10 is configured as a curved grid bar or a straight grid bar, and the second grid bar 11 is configured as a curved grid bar or a straight grid bar.

[0065] The plurality of first grid bars 10 are constructed as curved grid bars or straight grid bars. The plurality of second grid bars 11 are constructed as curved grid bars or straight grid bars.

[0066] When multiple second grille bars 11 are curved grille bars, the second grille bars 11 convex towards the volute side of the air cavity, and the multiple second grille bars 11 form a radial distribution. This design, combined with the position of the grille 6 in the main air duct 4, helps to improve the aerodynamic performance of the grille 6 when the airflow passing through the air outlet frame 5 in the main air duct 4. This can solve the problem of uneven airflow in the air duct structure of the air conditioning unit, and at the same time effectively reduce the wind resistance coefficient at the grille 6, thereby avoiding the problem of excessive airflow attenuation.

[0067] In some embodiments, as shown in FIG6, both the first grille bar 10 and the second grille bar 11 include a grille bar body;

[0068] The grid bar body has a head 1011 located on the airflow inflow side and a tail 1012 located on the airflow outflow side. The width of the grid bar body along its cross section gradually increases on the head side in the direction of airflow flow and gradually decreases on the tail side in the direction of airflow flow. The airflow flow direction is from the airflow inflow side to the airflow outflow side.

[0069] In this embodiment, the cross-section refers to the section obtained by cutting the grille bar body along the direction of arrow A in Figure 6. The air flow in the air cavity of the main air duct 4 first contacts the head 1011, which changes the air flow direction, thereby dispersing the eddy current. The air flow blown out from the main air duct 4 passes through the grille 6 and then blows onto the air outlet frame 5, reducing the pressure difference between the main air duct 4 and the air outlet frame 5, making the air outlet smoother. The air flow passing through the head 1011 is shunted and the air flow direction changes. The width of the cross-section of the tail 1012 gradually decreases along the air flow direction, which can quickly restore the dispersed air flow to circulation, thereby reducing the air volume loss.

[0070] As shown in Figure 9, after adding the grille 6 to the bottom of the air outlet frame 5 and assembling it onto the whole machine for noise experiment and testing. The overall machine noise sound has increased compared with that before adding the grille 6, and the abnormal sound caused by uneven air outlet has disappeared. This shows that the grille 6 composed of the first grille bars 10 can not only solve the problem of uneven air outlet in the air duct structure, but also help to reduce the air resistance coefficient at the grille 6, thus avoiding the problem of excessive air volume attenuation.

[0071] In some embodiments, as shown in Figure 7, the cross-section of the grille bar body has the maximum width in the fluid flow direction. The part of the grille bar body extending from the position of the maximum width towards the fluid outflow direction is the tail 1012, and the part of the grille bar body extending from the position of the maximum width towards the fluid inflow direction is the head 1011;

[0072] The cross-section of the grille bar body has a shape that is wide in the middle and narrow at both ends. The length of the cross-section of the head 1011 is h1, and the length of the cross-section of the tail 1012 is h2; where h2≥h1.

[0073] In this embodiment, it is designed that h2≥h1, so that the height of the head 1011 is smaller than that of the tail 1012. The head 1011 that first contacts the air flow quickly disperses the air flow, and the dispersion process is short. The tail 1012 cooperates with the head 1011 to quickly restore the dispersed air flow to circulation. The space between two adjacent tails 1012 on the grille 6 forms an air flow restoration channel for the air flow to circulate. The air flow circulation channel is long, which is conducive to the stable restoration of the air flow to circulation and is conducive to improving the aerodynamic performance of the grille 6. Designing t1<t and t2<t is conducive to the grille 6 having a sufficient cross-sectional area for the air flow to circulate, and is also conducive to the grille bar body having sufficient bearing strength under the action of the air flow impact without generating abnormal sounds itself.

[0074] In some embodiments, 2mm≤t≤5mm, 4mm≤h1+h2≤10mm.

[0075] The sum of design parameters h1 and h2 is limited, that is, the overall height of the grid bar body is limited to between 4mm and 10mm, so that the airflow passage of the grid 6 has a certain thickness, which is beneficial to improve the rectification effect of airflow. At the same time, the upper limit of this thickness helps to avoid increasing the flow resistance of the grid 6.

[0076] In some embodiments, as shown in FIG7, the cross-section of the grille bar body is a double trapezoidal surface. The cross-sectional portion corresponding to the head 1011 forms a first trapezoidal surface, and the cross-sectional portion corresponding to the tail 1012 forms a second trapezoidal surface. The long side of the first trapezoidal surface and the long side of the second trapezoidal surface share the same side. The short side of the first trapezoidal surface forms part of the outline of the head 1011, and the short side of the second trapezoidal surface forms part of the outline of the tail 1012;

[0077] The width of the shorter side of the first trapezoidal surface is t1, the width of the shorter side of the second trapezoidal surface is t2, and the width of the longer side of both trapezoidal surfaces is t. t > t1, t > t2;

[0078] The length of the head 1011 is the distance from the short side to the long side of the first trapezoidal surface, which is h1. The length of the tail 1012 is the distance from the short side to the long side of the second trapezoidal surface, which is h2.

[0079] Where h2≥h1.

[0080] In this embodiment, it should be noted that the double trapezoidal surface is not a strictly geometric double trapezoid, but rather an approximation of the shape of a double trapezoidal surface. As shown in Figure 7, in this double trapezoidal surface, there is an arc angle between the waistline and the corresponding base. The airflow in the main air duct 4 first contacts the head 1011, which changes the airflow direction, thereby dispersing the vortex. The airflow from the main air duct 4 passes through the grille 6 and then blows onto the outlet frame 5, reducing the pressure difference between the two and making the airflow smoother. The airflow is diverted as it flows through the head 1011, and the airflow direction changes. The cross-section of the tail 1012 gradually decreases in width along the airflow direction, which allows the dispersed airflow to quickly resume flow, thereby avoiding excessive airflow loss.

[0081] As shown in Figure 9, after adding a grille 6 to the bottom of the air outlet frame 5, it was assembled onto the entire unit for noise testing. The overall noise level of the unit was improved compared to before adding the grille 6, and the abnormal noise caused by uneven airflow disappeared. The grille 6, composed of the first grille strips 10, not only solves the problem of uneven airflow within the duct structure but also helps to reduce the wind resistance coefficient at the grille 6, thereby avoiding excessive airflow attenuation.

[0082] The cross-section of the grille bar body is a double trapezoidal surface, and the height of the head 1011 is smaller than that of the tail 1012. This enables the head 1011, which first contacts the air flow, to quickly disperse the air flow, and the dispersion process is relatively short. The tail 1012 cooperates with the head 1011 to quickly restore the flow of the dispersed air flow. The space between two adjacent tails 1012 located on the grille 6 forms an air flow restoration channel for the air flow to pass through. The formed air flow restoration channel is relatively long, which is conducive to the stable restoration of the air flow and the improvement of the aerodynamic performance of the grille 6.

[0083] Designing t1 < t and t2 < t can enable the grille 6 to have a sufficient cross-sectional area for the air flow to pass through, and it is also conducive to the grille bar body having sufficient bearing strength under the impact of the air flow without generating abnormal sounds.

[0084] In some embodiments, as shown in FIG. 7, the surface of the first grille bar 10 has a windward surface and a leeward surface separated by the maximum width. The windward surface includes a first windward surface 901, a second windward surface 902, and a third windward surface 903, and the leeward surface includes a first leeward surface 111, a second leeward surface 112, and a third leeward surface 113.

[0085] There are arc chamfers between the first windward surface 901 and the second windward surface 902 and the third windward surface 903, and there are arc chamfers between the first leeward surface 111 and the second leeward surface 112 and the third leeward surface 113. <s

[0086] As shown in FIG. 7, the arc chamfer radius of the head 1011 is r1, and the arc chamfer radius of the tail 1012 is r2. The arc chamfers of the head 1011 and the tail 1012 are conducive to further reducing the flow resistance of the head 1011 and the tail 1012 to the air flow.

[0087] In some embodiments, the side wall slope of the head 1011 is α1, and the side wall slope of the tail 1012 is α2. The slope parameters α1, α2, and the arc chamfer radius r1 of the head 1011 and r2 of the tail 1012 can all be determined according to the application conditions of the grille.

[0088] In some embodiments, as shown in FIG. 2, the fan 403 is a centrifugal fan, and the distance between the wall surface of the grille 6 close to the fan 403 and the axis center of the fan 403 is t3, where 400 mm ≤ t3 ≤ 700 mm.

[0089] In this embodiment, the installation position of the grille 6 within the air cavity of the main air duct 4 is limited. The distance between the wall surface of the grille 6 near the fan 403 and the center of the fan 403's axis is limited to between 400mm and 700mm. This helps ensure that the grille 6 effectively rectifyes the airflow. If this distance is too large, it cannot effectively eliminate vortex areas. If this distance is too small, the length of the rear air duct of the main air duct 4 will be short, i.e., the distance from the grille 6 to the air outlet 8 will be short, making it easy for secondary vortex areas to form within the air cavity of the rear air duct of the main air duct 4. Therefore, by limiting the distance between the grille 6 and the center of the fan 403's axis, it is beneficial to eliminate vortex areas and reduce the probability of secondary vortex formation. Thus, the grille 6 can achieve efficient rectification within the air duct structure and effectively reduce the probability of vortex generation.

[0090] As shown in Figure 1, in some embodiments, the main air duct 4 includes a volute 401 and a volute cover 402 connected to the volute 401. The volute 401 and the volute cover 402 together form the air cavity of the main air duct 4. The volute 401 and the volute cover 402 are advantageous for assembling a centrifugal fan.

[0091] This embodiment provides an air conditioner cabinet unit, including:

[0092] The air duct structure of the above embodiment.

[0093] Turbulent airflow within the duct structure can lead to a series of abnormal noise problems. Adding a grille 6 inside the duct structure of the air conditioner unit helps to smooth the airflow, thus resolving these noise issues during operation. The grille 6 is installed between the main duct 4 and the outlet frame 5. As the airflow in the main duct 4 flows, it contacts the grille 6, causing a change in airflow direction and dispersing the vortex. The airflow from the main duct 4 passes through the grille 6 before reaching the outlet frame 5, reducing the pressure difference between the two and resulting in smoother airflow.

[0094] As shown in Figure 7, the cross-sectional shape of the grille bar is designed as a double trapezoidal cross-section, meaning that the width of the cross-section at the head 1011 gradually increases along the airflow direction, while the width of the cross-section at the tail 1012 gradually decreases along the airflow direction. Airflow is diverted at the head 1011, changing its direction. The gradually decreasing width of the cross-section at the tail 1012 along the airflow direction allows the dispersed airflow to quickly resume its flow, thus avoiding excessive airflow loss.

[0095] As shown in Figure 9, after adding a grille 6 to the bottom of the air outlet frame 5, the unit was assembled and a noise test was conducted. The overall noise level of the unit was improved compared to before adding the grille 6, and the abnormal noise caused by uneven airflow disappeared. This indicates that the grille 6 can not only solve the problem of uneven airflow within the duct structure, but also help reduce the wind resistance coefficient, thereby avoiding excessive airflow attenuation.

[0096] In summary, the technical advantages of the disclosed air duct structure are as follows:

[0097] First, by installing the grille 6 between the air outlet 8 and the air outlet frame 5 of the main air duct 4, the airflow within the main air duct 4 contacts the grille 6 during its flow. The grille 6 disperses the vortex, and the airflow from the main air duct 4 passes through the grille 6 before reaching the air outlet frame 5. This helps reduce the pressure difference between the two, making the airflow smoother and thus helping to eliminate abnormal noise. Installing the grille 6 between the air outlet 8 and the air outlet frame 5 of the main air duct 4 effectively disperses the vortex area and facilitates the installation of the grille 6. Compared to installing the grille 6 inside the main air duct 4, the installation position of the grille 6 between the air outlet frame 5 and the air outlet 8 is easier to operate, and there is no need to add additional positioning parts inside the main air duct 4 to fix the grille 6. Instead, the grille 6 can be directly connected to the lower side of the air outlet frame 5 or the upper side of the air outlet 8, which helps to increase the unobstructed flow of the air cavity within the main air duct 4 and reduce the air resistance of the air cavity.

[0098] Secondly, the installation position of the grille 6 in the air cavity of the main air duct 4 is limited. The distance between the wall surface of the grille 6 near the fan 403 and the center of the axis of the fan 403 is limited to between 400mm and 700mm. This is conducive to the grille 6 playing a full rectification role in the airflow, effectively eliminating the vortex area while reducing the probability of secondary vortex area formation. Thus, the grille 6 can achieve efficient rectification in the air duct structure and effectively reduce the probability of generating vortex area.

[0099] Third, the cross-sectional shape of the grille bar body in the grille 6 is designed as a double trapezoidal cross-section, that is, the cross-sectional width of the head 1011 gradually increases along the airflow direction, and the cross-sectional width of the tail 1012 gradually decreases along the airflow direction. The airflow is diverted when it passes through the head 1011, and the airflow direction changes. The gradually decreasing cross-sectional width of the tail 1012 along the airflow direction can quickly restore the flow of the dispersed airflow, thereby avoiding excessive airflow loss. The grille 6, composed of grille bar bodies, can not only solve the problem of uneven airflow in the duct structure, but also help reduce the wind resistance coefficient at the grille 6, thereby avoiding the problem of excessive airflow attenuation.

[0100] Fourth, the head 1011 of the grid bar body is smaller in height than the tail 1012, so that the head 1011, which comes into contact with the airflow first, can quickly disperse the airflow. The dispersion process is short. The tail 1012 works with the head 1011 to quickly restore the flow of the dispersed airflow. The adjacent tails 1012 on the grid 6 form an airflow restoration channel for airflow. The airflow restoration channel is relatively long, which is more conducive to the stable restoration of airflow. Thus, the grid 6, which is composed of multiple grid bar bodies, has good aerodynamic performance.

[0101] Fifth, the width of the connection between the head 1011 and the tail 1012 is designed so that the grille 6 has a sufficiently large flow cross section for airflow, while also ensuring that the grille bar body has sufficient strength to withstand the impact of airflow without producing abnormal noise.

[0102] Sixth, the overall height of the grille bar body is designed so that the part of the grille 6 that allows airflow has a certain thickness, which is beneficial for enhancing the rectification effect of the airflow. This upper limit of thickness also helps to avoid increasing the flow resistance within the grille 6. Further, it can be understood that in this disclosure, "multiple" refers to two or more, and other quantifiers are similar. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, and B alone. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. The singular forms "a," "the," and "the" are also intended to include the plural forms unless the context clearly indicates otherwise.

[0103] It is further understood that the terms "first," "second," etc., are used to describe various types of information, but this information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another, and do not indicate a specific order or degree of importance. In fact, the expressions "first," "second," etc., are completely interchangeable. For example, without departing from the scope of this disclosure, first information can also be referred to as second information, and similarly, second information can also be referred to as first information.

[0104] It is further understood that although operations are described in a specific order in the accompanying drawings in the embodiments of this disclosure, this should not be construed as requiring these operations to be performed in the specific order or serial order shown, or requiring all of the shown operations to be performed to obtain the desired result. In certain environments, multitasking and parallel processing may be advantageous.

[0105] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the following claims.

[0106] It should be understood that this disclosure is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this disclosure is limited only by the appended claims.

Claims

1. A duct structure, comprising: The main air duct (4) has an air cavity and an air inlet (7) and an air outlet (8) connected to the air cavity; A fan (403) is installed in the air cavity of the main air duct (4). When the fan (403) is in operation, the airflow enters from the air inlet (7) and exits from the air outlet (8). An air outlet frame (5) is provided at the air outlet end (8), and the air outlet area of ​​the air outlet frame (5) is greater than the air outlet area of ​​the main air duct (4). A grille (6) is disposed between the air outlet frame (5) and the air outlet end (8).

2. The air duct structure according to claim 1, wherein, The grille (6) includes a plurality of first grille bars (10) and a plurality of second grille bars (11); The plurality of first grid strips (10) are arranged at intervals along a first direction; The plurality of second grid strips (11) are arranged at intervals along the second direction; The first direction intersects with the second direction, and the plurality of first grid strips (10) and the plurality of second grid strips (11) form a mesh structure.

3. The air duct structure according to claim 2, wherein, The plurality of first grid bars (10) and the plurality of second grid bars (11) are both constructed as curved grid bars.

4. The air duct structure according to claim 2 or 3, characterized in that, Both the first grid bar (10) and the second grid bar (11) include a grid bar body; The grid bar body has a head (1011) on the airflow inflow side and a tail (1012) on the airflow outflow side. The width of the cross section of the head (1011) gradually increases along the airflow direction, and the width of the cross section of the tail (1012) gradually decreases along the airflow direction. The airflow direction is from the airflow inflow side to the airflow outflow side.

5. The air duct structure according to claim 4, wherein, The cross section of the grid bar body has the maximum width in the fluid flow direction, the part extending from the location of the maximum width in the fluid outflow direction is the tail (1012), and the part extending from the location of the maximum width in the fluid inflow direction is the head (1011). The cross-section of the grid bar body has a shape that is wide in the middle and narrow at both ends, wherein the length of the cross-section of the head (1011) is h1 and the length of the cross-section of the tail (1012) is h2; wherein h2≥h1.

6. The air duct structure according to claim 4 or 5, wherein, The cross-section of the grille bar body is a double trapezoidal surface, wherein the cross-section portion corresponding to the head (1011) forms a first trapezoidal surface, and the cross-section portion corresponding to the tail (1012) forms a second trapezoidal surface, wherein the long side of the first trapezoidal surface and the long side of the second trapezoidal surface share the same side, the short side of the first trapezoidal surface forms part of the outline of the head (1011), and the short side of the second trapezoidal surface forms part of the outline of the tail (1012). The width of the short side of the first trapezoidal surface is t1, the width of the short side of the second trapezoidal surface is t2, and the width of the long side of the first trapezoidal surface and the second trapezoidal surface is t, where t > t1 and t > t2; The length of the head (1011) is the distance from the short side to the long side of the first trapezoidal surface, which is h1; the length of the tail (1012) is the distance from the short side to the long side of the second trapezoidal surface, which is h2. Where h2≥h1.

7. The air duct structure according to claim 6, wherein, 2mm≤t≤5mm; and / or 4mm≤h1+h2≤10mm.

8. The air duct structure according to any one of claims 5-7, wherein, The surface of the grille bar body has a windward side and a leeward side separated by the maximum width. The windward side includes a first windward side (901), a second windward side (902), and a third windward side (903). The leeward side includes a first leeward side (111), a second leeward side (112), and a third leeward side (113). The first windward surface (901) has an arc-shaped chamfer between it and the second windward surface (902) and the third windward surface (903), and the first leeward surface (111) has an arc-shaped chamfer between it and the second leeward surface (112) and the third leeward surface (113).

9. The air duct structure according to any one of claims 1-8, wherein, The fan (403) is a centrifugal fan, and the distance between the wall of the grille (6) near the fan (403) and the center of the axis of the fan (403) is t3, wherein 400mm≤t3≤700mm.

10. A cabinet air conditioner, comprising: The air duct structure as described in any one of claims 1-9.

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