Air duct structure and cabinet

Abstract

The invention relates to an air duct structure and a cabinet in the technical field of air conditioners, the air duct structure comprises a main air duct, a draught fan, an air outlet frame and a grating, the grating is installed between the air outlet end of the main air duct and the air outlet frame, airflow in the main air duct makes contact with the grating in the flowing process, the grating scatters vortexes, and therefore the airflow in the main air duct is in contact with the air outlet frame. Air flow blown out of the main air duct passes through the grille and then is blown to the air outlet frame, the pressure difference between the air flow and the air outlet frame is reduced, air outlet is smoother, and therefore abnormal sound is effectively eliminated. The installation position of the grille can effectively scatter the vortex area, meanwhile, installation operation of the grille is more convenient, the installation position is easy to operate, additional positioning pieces do not need to be added in the air duct to fix the grille, the grille only needs to be directly connected to the lower side of the air outlet frame or the upper side of the air outlet end, and the installation operation is convenient. The additional positioning piece is omitted, so that the smoothness of the air cavity of the main air duct is further improved, and the air resistance of the air cavity is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning, and in particular to an air duct structure and a cabinet unit. Background Art

[0002] In the relevant air duct structure technology for cabinet air conditioners, such as air discharge from top to bottom or from bottom to top, problems such as uneven air discharge, abnormal sounds and noises often occur.

[0003] This problem is particularly prominent for air conditioners with reversible air flow up and down. Summary of the invention

[0004] The technical problem to be solved by the present invention is that the flow field in the cabinet air duct is turbulent in the prior art, resulting in abnormal sound, and an air duct structure and a cabinet are provided.

[0005] The present invention aims to design an air duct structure, comprising:

[0006] A main air duct, wherein the main air duct is formed with an air cavity and an air inlet end and an air outlet end connected to the air cavity;

[0007] A fan, the fan being arranged in the air cavity of the main air duct, and the fan being operated so that air flows in along the air inlet end and is discharged from the air outlet end;

[0008] An air outlet frame, the air outlet frame is arranged 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;

[0009] A grille is arranged between the air outlet frame and the air outlet end.

[0010] In some embodiments, the grid includes a plurality of first grid bars and a plurality of second grid bars;

[0011] The plurality of first grid bars are arranged at intervals along a first direction;

[0012] The plurality of second grid bars are arranged at intervals along the second direction;

[0013] The first direction intersects with the second direction, and the plurality of first grid bars and the plurality of second grid bars form a mesh structure.

[0014] In some embodiments, the plurality of first grid bars and the plurality of second grid bars are both configured as curved grid bars.

[0015] In some embodiments, the first grid bar and the second grid bar each include a grid bar body;

[0016] The grille bar body has a head portion located on the airflow inlet side and a tail portion located on the airflow outlet side. The width of the grille bar body along its cross section gradually increases along the airflow flow direction on its head portion side, and gradually decreases along the airflow flow direction on its tail portion side. The airflow flow direction is the direction from the airflow inlet side to the airflow outlet side.

[0017] In some embodiments, the cross section of the grille bar body has a maximum width in the fluid flow direction, the portion extending from the maximum width position to the fluid outflow direction is the tail portion, and the portion extending from the maximum width position to the fluid inflow direction is the head portion;

[0018] 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; the length of the cross section of the tail is h2; wherein h2≥h1.

[0019] 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 portion constitutes a first trapezoidal surface, and the cross section portion corresponding to the tail portion constitutes 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 constitutes the contour line of the head portion, and the short side of the second trapezoidal surface constitutes the contour line of the tail portion;

[0020] The short side width of the first trapezoidal surface is t1, the short side width of the second trapezoidal surface is t2, and the long side width is t, t>t1, t>t2;

[0021] The length of the head portion is the distance from the short side of the first trapezoidal surface to the long side, which is h1, and the length of the tail portion is the distance from the short side of the second trapezoidal surface to the long side, which is h2;

[0022] Among them, h2≥h1.

[0023] In some embodiments, 2 mm ≤ t ≤ 5 mm, and / or 4 mm ≤ h1 + h2 ≤ 10 mm.

[0024] In some embodiments, the surface of the grille bar body has a windward side and a leeward side separated by the maximum width;

[0025] The windward surface includes a first windward surface, a second windward surface and a third windward surface;

[0026] The leeward surface includes a first leeward surface, a second leeward surface and a third leeward surface;

[0027] The first windward surface has an arc chamfer with the second windward surface and the third windward surface, and the first leeward surface has an arc chamfer with the second leeward surface and the third leeward surface.

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

[0029] In some embodiments, a cabinet is provided, comprising:

[0030] The above-mentioned air duct structure.

[0031] The solution provided by the present invention has the following beneficial effects compared with the prior art:

[0032] By installing the grille between the outlet end of the main air duct and the outlet frame, the airflow in the main air duct contacts the grille during the flow, and the grille breaks up the vortex. The airflow blown out from the main air duct passes through the grille and then blows to the outlet frame, reducing the pressure difference between the two, making the air outlet smoother, thereby effectively eliminating abnormal sounds. The grille installed between the outlet end of the main air duct and the outlet frame can not only effectively break up the vortex area, but also make it easier to install the grille. Compared with installing the grille inside the air duct, the installation position is easy to operate, and there is no need to add additional positioning parts inside the air duct to fix the grille. Instead, the grille only needs to be directly connected to the lower side of the outlet frame or the upper side of the air outlet. The elimination of additional positioning parts further increases the smoothness of the air cavity of the main air duct and reduces the wind resistance of the air cavity. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The accompanying drawings are part of the present invention and 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, but do not constitute an improper limitation of the present invention. Obviously, the drawings described below are only some embodiments. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. In the accompanying drawings:

[0034] Figure 1 is an exploded view of the air duct structure shown in an embodiment of the present invention;

[0035] Figure 2 It is one of the cross-sectional views of the air duct structure shown in the embodiment of the present invention;

[0036] Figure 3 This is the second cross-sectional view of the air duct structure shown in the embodiment of the present invention;

[0037] Figure 4 is a schematic diagram of a grid structure shown in an embodiment of the present invention;

[0038] Figure 5 is a top view of the connection state of the grille and the air outlet frame shown in an embodiment of the present invention;

[0039] Figure 6 is a schematic diagram of a first grid bar structure shown in an embodiment of the present invention;

[0040] Figure 7 is a schematic cross-sectional view of a first grid bar shown in an embodiment of the present invention;

[0041] Figure 8 It is a simulation diagram of the flow field of the air duct structure without the grille installed shown in the comparative example of the present invention;

[0042] Fig. 9 It is a simulation diagram of the flow field of the grille installed in the air duct structure shown in an embodiment of the present invention.

[0043] In the figure: 10-first grille bar, 11-second grille bar, 1011-head, 1012-tail, 2-frame, 4-main air duct, 401-volute, 402-volute cover, 403-fan, 5-air outlet frame, 6-grille, 7-air inlet end, 8-air outlet end, 901-first windward side, 902-second windward side, 903-third windward side, 111-first leeward side, 112-second leeward side, 113-third leeward side.

[0044] It should be noted that these drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any way, but are intended to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0045] In the description of the present invention, it should be noted that the terms "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0046] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "contacted", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0047] Through the whole machine fluid simulation, we were surprised to find that the root cause of the uneven air output and abnormal noise of the cabinet air conditioner is the large vortex area at the connection between the air duct and the air outlet frame of the cabinet, which causes the air flow blown out of the air duct to be turbulent, resulting in uneven air output and abnormal noise of the whole machine. Based on this, we innovatively proposed to set a grille at the connection between the air duct and the air outlet frame to rectify the airflow flowing from the air outlet end of the air duct to the air outlet frame, which has the advantages of reducing internal vortex and low flow resistance. The cabinet air conditioner equipped with this grille can reduce noise while reducing air volume attenuation.

[0048] Embodiment 1:

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

[0050] A main air duct 4 is formed with an air cavity and an air inlet end 7 and an air outlet end 8 connected to the air cavity;

[0051] The fan 403 is arranged in the air cavity of the main air duct 4. When the fan 403 works, the air flows in along the air inlet end 7 and out through the air outlet end 8;

[0052] An air outlet frame 5, which is disposed at the air outlet end 8, and an air outlet area of ​​the air outlet frame 5 is larger than an air outlet area of ​​the main air duct 4;

[0053] The grille 6 is disposed between the air outlet frame 5 and the air outlet end 8 .

[0054] In this embodiment, the air duct structure can be used in an air-conditioning cabinet, and 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. The air outlet of the main air duct 4 is expanded by setting the air outlet frame 5 to increase the air volume. However, at the expansion point, that is, the main air duct 4 and the air outlet frame 5 are assembled and connected, there will be a pressure difference at both ends of the intersection due to the different air outlet cross-sections, which is easy to cause air flow turbulence, thereby generating noise such as uneven air outlet, such as Figure 8 As shown in the simulation diagram of the fluid in the air duct, it can be seen that there is a large vortex area at the connection between the air duct and the air outlet frame. Figure 8 The dotted line causes the airflow from the main air duct 4 to be turbulent, resulting in uneven airflow and abnormal noise from the air conditioner. By installing the grille 6 between the air outlet end 8 of the main air duct 4 and the air outlet frame 5, the airflow in the main air duct 4 contacts the grille 6 during the flow process, and the grille 6 breaks up the vortex, such as Fig. 9 As shown, it is a simulation diagram of the fluid in the air duct after the grille 6 is installed. The airflow blown out from the main air duct 4 passes through the grille 6 and then blows to the air outlet frame 5, reducing the pressure difference between the two, making the air outlet smoother, thereby effectively eliminating noise.

[0055] In the existing air duct structure, the grille is generally installed inside the air duct. In the present embodiment, the grille 6 is installed between the air outlet end 8 of the main air duct 4 and the air outlet frame 5. In addition to being able to effectively break up the vortex area, it is also more convenient to install the grille. Specifically, the installation operation of the grille 6 is located on the upper side of the air outlet end 8 or the lower side of the air outlet frame 5. For example, the grille 6 is first connected to the lower end of the air outlet frame 5, and the grille 6 and the air outlet frame 5 form a pre-assembled component, and then the pre-assembled component is installed on the upper end of the air outlet end 8, or the grille 6 is first connected to the upper end of the air outlet end 8, and the grille 6 and the main air duct 4 form a pre-assembled component, and then the air outlet frame 5 is installed on the upper end of the pre-assembled component. Compared with installing the grille inside the air duct, the installation position is easy to operate, and there is no need to add additional positioning parts inside the air duct to fix the grille 6. Instead, the grille 6 only needs to be directly connected to the lower side of the air outlet frame 5 or the upper side of the air outlet end 8. The cancellation of the additional positioning parts further increases the smoothness of the air cavity of the main air duct 4 and reduces the wind resistance of the air cavity.

[0056] In the present embodiment, the air inlet direction and the air outlet direction in the air duct structure are not limited. The air duct structure can have downward air inlet and upward air outlet, upward air inlet and downward air outlet, or side air inlet and upward and downward air outlet. As long as the air outlet position in the air duct structure has the arrangement method of the air outlet frame and the grille proposed in the embodiment, noise elimination and convenient installation can be achieved.

[0057] Optionally, in an implementation of this embodiment, as Figure 4 , 5 As shown,

[0058] The grid 6 includes a plurality of first grid bars 10 and a plurality of second grid bars 11;

[0059] A plurality of first grid bars 10 are arranged at intervals along a first direction;

[0060] A plurality of second grid bars 11 are arranged at intervals along the second direction;

[0061] The first direction intersects with the second direction, and the plurality of first grid bars 10 and the plurality of second grid bars 11 form a mesh structure.

[0062] In this embodiment, the grille 6 is composed of the first grille bar 10, the second grille bar 11 and the frame 2. A fixing seat is connected to the outside of the frame 2, and the fixing seat facilitates the fixing and assembly of the frame 2 and the air outlet frame 5. Figure 5 As shown, the grille is installed at the bottom of the air outlet frame 5 and is fixed to the air outlet frame 5 by four screws. The bottom of the air outlet frame 5 and the air outlet on the main air duct 4 are fixed by screws. The grille is located at the connection between the air outlet frame 5 and the main air duct 4.

[0063] The first grille bars 10 are fixedly connected to the inner side of the frame 2 as the longitudinal spokes in the grille, and the second grille bars 11 are fixedly connected between the adjacent first grille bars 10 as the transverse spokes in the grille. A straight grille bar body layout or a curved grille bar body layout can be adopted according to the characteristics of the fluid flow velocity. At the same time, the distance between each grille bar body, that is, the density of the grille can be optimized through the overall installation position of the grille and the flow field of the whole machine. For example, for different wind guide directions, the grille adopts different dense or sparse arrangements according to the needs to better achieve rectification and change the direction of the airflow, thereby improving the flow field and reducing noise.

[0064] The grille 6 effectively optimizes the flow field of the air duct structure, reduces the vortex area inside the air duct of the air conditioner, and at the same fan speed, the air output is larger while eliminating abnormal sounds.

[0065] Optionally, in an implementation of this embodiment, as Figure 4 , 6 As shown,

[0066] The first grid bars 10 are designed as curved grid bars or straight grid bars, and the second grid bars 11 are designed as curved grid bars or straight grid bars.

[0067] The plurality of first grid bars 10 are configured as curved grid bars or straight grid bars;

[0068] The plurality of second grid bars 11 are configured as curved grid bars or straight grid bars;

[0069] When the plurality of second grille bars 11 are curved grille bars, they protrude toward the tongue side of the wind cavity, forming a radial distribution as a whole. This design is coordinated with the position of the grille 6 in the main air duct 4. When the airflow flowing through the main air duct 4 passes through the air outlet frame 5, the grille 6 as a whole achieves good aerodynamic performance, which can solve the problem of uneven air outlet in the air duct of the air conditioner, and effectively reduce the wind resistance coefficient at the grille, thereby avoiding the problem of excessive air volume attenuation.

[0070] Optionally, in an implementation of this embodiment, as Figure 6 As shown,

[0071] The first grid bar 10 and the second grid bar 11 both include a grid bar body;

[0072] The grille bar body has a head portion 1011 located on the airflow inlet side and a tail portion 1012 located on the airflow outlet side. The width of the grille bar body along its cross section gradually increases along the airflow flow direction on its head side, and gradually decreases along the airflow flow direction on its tail side. The airflow flow direction is from the airflow inlet side to the airflow outlet side.

[0073] In this embodiment, the cross section refers to the Figure 6The cross-section obtained by cutting the grille bar body along the direction of arrow A in the middle. The air flow in the air chamber of the main air duct 4 first contacts the head 1011. The head 1011 changes the direction of the air flow, thereby dispersing the eddy current. The air flow blown out from the air duct passes through the grille and then blows onto the air outlet frame, reducing the pressure difference between the two, making the air outlet smoother. The air flow passing through the head 1011 is shunted and the direction of the air flow is changed. The width of the tail 1012 gradually decreases along the direction of the air flow in the air conditioner, which can quickly restore the dispersed air flow to circulation, thus avoiding excessive air volume loss. For example, Fig. 9 As shown, after adding the grille 6 at the bottom of the air outlet frame 5 and assembling it onto the whole machine for the noise test, the overall noise of the machine has increased compared with that before adding the grille 6, and the uneven air outlet abnormal noise has disappeared. The grille 6 composed of the first grille bars 10 can not only solve the problem of uneven air outlet in the air conditioner air duct, but also effectively reduce the air resistance coefficient at the grille, thereby avoiding the problem of excessive air volume attenuation.

[0074] Optionally, in an implementation manner of this embodiment, as Figure 7 shown,

[0075] The cross-section of the grille bar body has a maximum width in the fluid flow direction. The part extending from the maximum width position to the fluid outflow direction is the tail 1012, and the part extending from the maximum width position to the fluid inflow direction is the head 1011;

[0076] The cross-section of the grille bar body has a shape that is wider in the middle and narrower at both ends. The length of the cross-section part of the head 1011 is h1; the length of the cross-section part of the tail 1012 is h2; where h2≥h1.

[0077] Preferably, 2mm≤t≤5mm, and / or 4mm≤h1 + h2≤10mm.

[0078] In this embodiment, it is designed that h2≥h1. The height of the head 1011 is smaller than that of the tail 1012, so that the head 1011 that first contacts the air flow quickly disperses the air flow, and the dispersion process is shorter. The tail 1012 cooperates with the head 1011 to quickly restore the dispersed air flow to circulation. The spaces between adjacent tails 1012 on the grille 6 form air flow restoration channels for the air flow to circulate. The air flow circulation channels are longer, which is more conducive to the stable restoration of the air flow to circulation and realizes the good aerodynamic performance of the overall grille. Designing t1<t and t2<t can make the grille 6 have a suitable flow cross-section for the air flow to circulate, and at the same time ensure that the grille bar body has sufficient bearing strength under the action of the air flow impact and does not generate abnormal sounds by itself.

[0079] The sum of the design parameters h1 and h2 is limited, that is, the overall height of the grille bar body is limited to between 4mm and 10mm, so that the air flow circulation part of the grille has a certain thickness to ensure the air flow rectification effect. At the same time, the thickness is not too large to avoid increasing the flow resistance of the grille 6.

[0080] Optionally, in an implementation of this embodiment, as Figure 7 As shown,

[0081] The cross section of the grille bar body is a double trapezoidal surface, wherein the cross section portion corresponding to the head portion 1011 constitutes a first trapezoidal surface, and the cross section portion corresponding to the tail portion 1012 constitutes 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 constitutes a partial contour line of the head portion 1011, and the short side of the second trapezoidal surface constitutes a partial contour line of the tail portion 1012;

[0082] The short side width of the first trapezoidal surface is t1, the short side width of the second trapezoidal surface is t2, and the long side width is t, t>t1, t>t2;

[0083] The length of the head 1011 is the distance from the short side of the first trapezoidal surface to the long side, which is h1, and the length of the tail 1012 is the distance from the short side of the second trapezoidal surface to the long side, which is h2;

[0084] Among them, h2≥h1.

[0085] In this embodiment, it should be noted that the double trapezoidal surface is not a double trapezoidal surface in a strict sense of the geometric shape, but is a double trapezoidal surface that is approximately Figure 7 As shown, in the double trapezoidal surface, there is an arc angle between the waistline and the corresponding bottom edge, and the airflow in the air cavity of the main air duct 4 first contacts the head 1011, and the head 1011 changes the direction of the airflow, thereby breaking up the vortex, and the airflow blown out from the air duct passes through the grille and then blows to the air outlet frame, reducing the pressure difference between the two, making the air outlet smoother, and the airflow passing through the head 1011 is diverted and the airflow direction is changed. The width of the tail 1012 along the airflow direction in the air conditioner is gradually reduced, so that the dispersed airflow can be quickly restored to circulation, thereby avoiding excessive air volume loss. Fig. 9As shown, after adding the grille 6 at the bottom of the air outlet frame 5, the whole machine is assembled to test the noise experiment. The noise of the whole machine is improved compared with that before adding the grille 6, and the abnormal sound of uneven air outlet disappears. The grille 6 composed of the first grille bar 10 can not only solve the problem of uneven air outlet in the air duct of the air conditioner, but also effectively reduce the wind resistance coefficient at the grille, thereby avoiding the problem of excessive air volume attenuation. Further, the double trapezoidal surface makes the head 1011 smaller than the tail 1012, so that the head 1011 that contacts the airflow first quickly breaks up the airflow, and the breaking process is short. The tail 1012 cooperates with the head 1011 to quickly restore the broken airflow. The airflow recovery channel is formed between the adjacent tails 1012 on the grille 6 for airflow circulation. The airflow circulation channel is longer, which is more conducive to the stable recovery of airflow circulation, and achieves good aerodynamic performance of the grille as a whole, and can make the grille 6 have a suitable flow cross section for airflow circulation, while ensuring that the grille bar body has sufficient bearing strength under the impact of airflow without generating abnormal sound.

[0086] Optionally, in an implementation of this embodiment, as Figure 7 As shown,

[0087] The surface of the first grid bar 10 has a windward side and a leeward side separated by a maximum width;

[0088] The windward surface includes a first windward surface 901, a second windward surface 902 and a third windward surface 903;

[0089] The leeward surface includes a first leeward surface 111, a second leeward surface 112 and a third leeward surface 113;

[0090] The first windward surface 901 and the second windward surface 902 and the third windward surface 903 all have arc chamfers, and the first leeward surface 111 and the second leeward surface 112 and the third leeward surface 113 all have arc chamfers.

[0091] In this embodiment, the radius of the arc chamfer of the head 1011 is r1, and the radius of the arc chamfer of the tail 1012 is r2. The two arc chamfers further reduce the flow resistance of the head 1011 and the tail 1012 to the airflow.

[0092] Preferably, the slope of the side wall of the head 1011 is α1, and the slope of the side wall of the head 1011 is α2. The slope parameters α1, α2 and the arc chamfer radii r1 and r2 can be determined according to the application conditions of the grille.

[0093] Optionally, in an implementation of this embodiment, as Figure 2 As shown,

[0094] 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 center of the axis of the fan 403 is t3, wherein 400 mm≤t3≤700 mm.

[0095] In the present embodiment, the installation position of the grille 6 in the air cavity of the main air duct 4 is limited, and the distance between the side wall of the grille 6 close to the fan 403 and the axial center of the fan 403 is limited to between 400 mm and 700 mm, so as to ensure that the grille 6 has a sufficient rectifying effect on the airflow. If the distance is too large, the vortex zone cannot be effectively eliminated. If the distance is too small, the length of the air duct at the rear end of the main air duct 4 is shorter, that is, the distance from the grille 6 to the air outlet end 8 is shorter, which makes it easy for a secondary vortex zone to form in the air cavity of the air duct at the rear end of the main air duct 4. Therefore, by limiting the distance between the grille 6 and the axial center of the fan 403, the vortex zone can be effectively eliminated while reducing the probability of secondary formation of the vortex zone. Therefore, the grille can achieve efficient rectification in the air duct and effectively reduce the probability of generating a vortex zone.

[0096] Preferably, the main air duct 4 includes a volute 401 and a volute cover 402 connected to the volute 401, and the volute 401 and the volute cover 402 together form an air cavity of the main air duct 4. The arrangement of the volute 401 and the volute cover 402 is more suitable for assembling a centrifugal fan.

[0097] Embodiment 2

[0098] This embodiment provides a cabinet, including:

[0099] The air duct structure in the first embodiment.

[0100] The turbulent flow field in the air duct of the air conditioner will cause a series of abnormal sound problems. By adding a grille 6 inside the air duct structure of the air conditioner, the flow field inside the air duct is optimized and the abnormal sound problem during the operation of the air conditioner is solved. The grille is installed between the main air duct 4 and the air outlet frame 5. During the flow of the air in the main air duct 4, it contacts the grille 6 to change the direction of the air flow, thereby breaking up the vortex. The air flow blown out of the air duct passes through the grille 6 and then blows to the air outlet frame 5, reducing the pressure difference between the two, making the air outlet smoother. Figure 7 As shown, the cross-sectional shape of the grille bar body is designed to be a double trapezoidal cross-section, that is, the cross-sectional width of the head 1011 along the air flow direction in the air conditioner gradually increases, and the cross-sectional width of the tail 1012 along the air flow direction in the air conditioner gradually decreases. The air flow passing through the head 1011 is diverted and the air flow direction is changed. The cross-sectional width of the tail 1012 along the air flow direction in the air conditioner gradually decreases, which can make the dispersed air flow quickly resume circulation, thereby avoiding excessive air volume loss. Fig. 9As shown, after adding a grille at the bottom of the air outlet frame, it was assembled on the whole machine to test the noise experiment. The noise of the whole machine was improved compared with before the grille was added, and the abnormal sound of uneven air outlet disappeared. The grille 6 can solve the problem of uneven air outlet in the air duct of the air conditioner, and at the same time has a smaller wind resistance coefficient, thereby avoiding the problem of excessive air volume attenuation.

[0101] In summary, the ingenious design of the air duct structure lies in:

[0102] First, by installing the grille between the outlet end of the main air duct and the outlet frame, the airflow in the main air duct contacts the grille during the flow, and the grille breaks up the vortex. The airflow blown out from the main air duct passes through the grille and then blows to the outlet frame, reducing the pressure difference between the two, making the air flow smoother, thereby effectively eliminating abnormal sounds. The grille installed between the outlet end of the main air duct and the outlet frame can not only effectively break up the vortex area, but also make it easier to install the grille. Compared with installing the grille inside the air duct, the installation position is easy to operate, and there is no need to add additional positioning parts inside the air duct to fix the grille. Instead, the grille only needs to be directly connected to the lower side of the outlet frame or the upper side of the air outlet. The elimination of additional positioning parts further increases the smoothness of the air cavity of the main air duct and reduces the wind resistance of the air cavity.

[0103] Secondly, the installation position of the grille in the air cavity of the main air duct is limited, and the distance between the side wall of the grille close to the fan and the center of the fan axis is limited to between 400mm and 700mm, to ensure that the grille has a sufficient rectifying effect on the airflow, effectively eliminating the vortex zone while reducing the probability of secondary formation of the vortex zone. In this way, the grille can achieve efficient rectification in the air duct and effectively reduce the probability of generating a vortex zone.

[0104] Thirdly, the cross-sectional shape of the grille bar body in the grille is designed to be a double trapezoidal cross-section, that is, the cross-sectional width of the head along the direction of airflow in the air conditioner gradually increases, and the cross-sectional width of the tail along the direction of airflow in the air conditioner gradually decreases. The airflow is diverted and the direction of the airflow changes when passing through the head, and the cross-sectional width of the tail along the direction of airflow in the air conditioner gradually decreases, so that the dispersed airflow can be quickly restored to circulation, thereby avoiding excessive air volume loss. The grille composed of the grille bar body can not only solve the problem of uneven air outlet in the air duct of the air conditioner, but also effectively reduce the wind resistance coefficient at the grille, thereby avoiding the problem of excessive air volume attenuation.

[0105] Fourthly, the height of the head part in the grille bar body is designed to be smaller than that of the tail part, so that the head part that contacts the airflow first can quickly break up the airflow, and the breaking up process is shorter. The tail part cooperates with the head part to quickly restore the broken up airflow. An airflow recovery channel is formed between the adjacent tail parts on the grille for airflow circulation. The airflow circulation channel is longer, which is more conducive to the stable recovery of the airflow. Therefore, the grille composed of multiple grille bar bodies has good aerodynamic performance.

[0106] Fifth, design the width of the connection between the head and the tail so that the grille has a suitable flow cross-section for airflow, while ensuring that the grille bar body has sufficient bearing strength when impacted by airflow without producing abnormal sound.

[0107] Sixth, the overall height of the grille bar body is designed so that the airflow circulation part of the grille has a certain thickness to ensure the airflow rectification effect. At the same time, the thickness is not too large to avoid increasing the flow resistance of the grille.

[0108] It is further understood that in the present disclosure, "plurality" refers to two or more than two, and other quantifiers are similar thereto. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B may represent: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the associated objects before and after are in an "or" relationship. The singular forms "a", "the" and "the" are also intended to include plural forms, unless the context clearly indicates other meanings.

[0109] It is further understood that the terms "first", "second", etc. are used to describe various information, but such information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other, and do not indicate a specific order or degree of importance. In fact, the expressions "first", "second", etc. can be used interchangeably. For example, without departing from the scope of the present disclosure, the first information can also be referred to as the second information, and similarly, the second information can also be referred to as the first information.

[0110] It is further understood that, although the operations are described in a specific order in the drawings in the embodiments of the present disclosure, it should not be understood as requiring the operations to be performed in the specific order shown or in a serial order, or requiring the execution of all the operations shown to obtain the desired results. In certain environments, multitasking and parallel processing may be advantageous.

[0111] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present disclosure that follow the general principles of the present disclosure and include common knowledge or customary techniques in the art that are not disclosed in the present disclosure. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present disclosure are indicated by the following claims.

[0112] It should be understood that the present disclosure is not limited to the precise structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the scope of the appended claims.

Claims

1. An air duct structure, characterized in that: include: A main air duct (4), wherein the main air duct (4) is formed with an air cavity and an air inlet end (7) and an air outlet end (8) communicated with the air cavity; A fan (403), the fan (403) being arranged in the air cavity of the main air duct (4), the fan (403) being operated so that airflow enters along the air inlet end (7) and is discharged from the air outlet end (8); An air outlet frame (5), the air outlet frame (5) being arranged at the air outlet end (8), and the air outlet area of ​​the air outlet frame (5) being larger than the air outlet area of ​​the main air duct (4); A grille (6), wherein the grille (6) is arranged between the air outlet frame (5) and the air outlet end (8).

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

3. The air duct structure according to claim 2, characterized in that: The plurality of first grid bars (10) and the plurality of second grid bars (11) are both configured as curved grid bars.

4. The air duct structure according to claim 2, characterized in that: The first grid bar (10) and the second grid bar (11) both comprise a grid bar body; The grille bar body has a head portion (1011) located on the airflow inlet side and a tail portion (1012) located on the airflow outlet side. The grille bar body has a width gradually increasing along the airflow flow direction on its head portion along its cross section, and a width gradually decreasing along the airflow flow direction on its tail portion. The airflow flow direction is the direction from the airflow inlet side to the airflow outlet side.

5. The air duct structure according to claim 4, characterized in that: The cross section of the grille bar body has a maximum width in the fluid flow direction, the portion extending from the maximum width position to the fluid outflow direction is the tail portion (1012), and the portion extending from the maximum width position to the fluid inflow direction is the head portion (1011); 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 (1011) is h1; the length of the cross section of the tail (1012) is h2; wherein h2≥h1.

6. The air duct structure according to claim 4, characterized in that: The cross section of the grille bar body is a double trapezoidal surface, wherein the cross section portion corresponding to the head portion (1011) constitutes a first trapezoidal surface, and the cross section portion corresponding to the tail portion (1012) constitutes 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 constitutes a partial contour line of the head portion (1011), and the short side of the second trapezoidal surface constitutes a partial contour line of the tail portion (1012); The short side width of the first trapezoidal surface is t1, the short side width of the second trapezoidal surface is t2, and the long side width is t, t>t1, t>t2; The length of the head portion (1011) is the distance from the short side of the first trapezoidal surface to the long side, which is h1, and the length of the tail portion (1012) is the distance from the short side of the second trapezoidal surface to the long side, which is h2; Among them, h2≥h1.

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

8. The air duct structure according to claim 5, characterized in that: The surface of the grille bar body has a windward side and a leeward side separated by the maximum width; The windward surface comprises a first windward surface (901), a second windward surface (902) and a third windward surface (903); The leeward surface comprises a first leeward surface (111), a second leeward surface (112) and a third leeward surface (113); The first windward surface (901) and the second windward surface (902) and the third windward surface (903) all have arc chamfers, and the first leeward surface (111) and the second leeward surface (112) and the third leeward surface (113) all have arc chamfers.

9. The air duct structure according to any one of claims 1 to 8, characterized in that: 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 center of the axis of the fan (403) is t3, wherein 400 mm≤t3≤700 mm.

10. A cabinet machine, characterized in that: include: The air duct structure according to any one of claims 1 to 9.

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