Air duct structure and cabinet

Abstract

The utility model relates to an air duct structure and a cabinet machine in the technical field of air conditioners, the air duct structure comprises a main air duct, a 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 contacts with the grating in the flowing process, the grating scatters eddy current, and the air outlet end of the main air duct is connected 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 utility model relates to the technical field of air conditioning, in particular to an air duct structure and a cabinet unit. Background Art

[0002] In the relevant air duct structure technology of 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. Utility Model Content

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

[0005] The utility model aims to design an air duct structure, including:

[0006] A main air duct, the main air duct forming an air cavity and an air inlet end and an air outlet end communicating with 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 out through the air outlet end;

[0008] An air outlet frame, the air outlet frame being arranged at the air outlet end, and the air outlet area of ​​the air outlet frame being 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 grille includes a plurality of first grille bars and a plurality of second grille 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 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 on its head side along the airflow flow direction, and gradually decreases on its tail side along the airflow flow direction. The airflow flow direction is 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 direction of fluid flow, the portion extending from the maximum width position in the direction of fluid outflow is the tail portion, and the portion extending from the maximum width position in the direction of fluid inflow is the head portion;

[0018] The cross section of the grille bar body has a shape of being wide in the middle and narrow at both ends, wherein the length of the cross section of the head portion is h1; the length of the cross section of the tail portion 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-sectional portion corresponding to the head portion constitutes a first trapezoidal surface, and the cross-sectional 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 outline of the head portion, and the short side of the second trapezoidal surface constitutes the outline 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; 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 side includes a first leeward side, a second leeward side and a third leeward side;

[0027] There are arc-shaped chamfers between the first windward surface, the second windward surface and the third windward surface, and there are arc-shaped chamfers between the first leeward surface, 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] Compared with the prior art, the solution provided by this utility model has the following beneficial effects:

[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 its flow, breaking up the vortex. The airflow blown out from the main air duct passes through the grille before being blown to the outlet frame, reducing the pressure difference between the two, making the air flow smoother, and thus effectively eliminating abnormal sounds. Installing the grille 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 main air duct air cavity 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 illustrative 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 those skilled in the art, other drawings can be obtained based on these drawings without inventive work. In the drawings:

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

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

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

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

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

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

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

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

[0042] Figure 9 This 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 rather 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" and "outside" etc. indicating orientations or positional relationships are 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, and do not indicate or imply 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 this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," "in contact," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; and direct connections or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0047] Through whole-machine fluid simulation, we were surprised to find that the root cause of the uneven airflow and abnormal noise often encountered in cabinet air conditioners is the large vortex area at the connection between the cabinet air duct and the air outlet frame, which causes turbulent airflow blown out of the air duct, resulting in uneven airflow and abnormal noise from the whole machine. Based on this, we innovatively proposed to install 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. This has the advantages of reducing internal vortexes and low flow resistance. Cabinet air conditioners equipped with this grille can reduce noise while reducing air volume attenuation.

[0048] Example 1:

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

[0050] The main air duct 4 is formed with an air cavity and an air inlet end 7 and an air outlet end 8 communicating with 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] The air outlet frame 5 is provided 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] 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. 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 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, which can easily lead to air flow turbulence, thereby generating uneven air outlet noise, such as Figure 8 As shown in the fluid simulation diagram in the air duct, 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 its flow, and the grille 6 breaks up the vortex. Figure 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] 4 and the upper end of the air outlet frame 5 is connected, and the grille 6 and the main air duct 4 are connected to 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 in the air cavity.

[0056] In this 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 setting 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 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 to facilitate 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 position of the grille is located at the connection between the air outlet frame 5 and the main air duct 4.

[0063] First grille bars 10, acting as the longitudinal spokes of the grille, are fixedly connected to the inner side of frame 2. Second grille bars 11, acting as the transverse spokes of the grille, are fixedly connected between adjacent first grille bars 10. Depending on the fluid velocity characteristics, a straight or curved grille bar layout can be employed. The distance between each grille bar, i.e., the density of the grille, can be optimized based on the overall grille installation position and the overall flow field. For example, for different airflow directions, the grille can be arranged in a dense or sparse pattern to better rectify and redirect 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 lattice bars 10 are designed as curved lattice bars or straight lattice bars, and the second lattice bars 11 are designed as curved lattice bars or straight lattice 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 method cooperates 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 the cross section gradually increases on the head side along the airflow flow direction, and gradually decreases on the tail side along the airflow flow direction. The airflow 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 cavity of the main air duct 4 first contacts the head 1011. The head 1011 changes the air flow direction, thereby dispersing the eddy current. The air flow 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. When the air flow passes through the head 1011, it is shunted and the air flow direction changes. The width of the tail 1012 gradually decreases along the air flow direction inside the air conditioner, which can quickly restore the dispersed air flow to circulation, thus avoiding excessive air volume loss, such as Figure 9 shown. After adding the grille 6 at the bottom of the air outlet frame 5 and assembling it onto the whole machine for noise testing, the overall noise of the machine has increased compared with that before adding the grille 6, and the uneven air outlet and abnormal noise have 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, thus 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 towards the fluid outflow direction is the tail 1012, and the part extending from the maximum width position towards 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, and 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 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 recovery channels for the air flow to circulate. The air flow circulation channels are longer, which is more conducive to the stable restoration of air flow circulation and realizes good aerodynamic performance of the overall grille. Designing t1 < t and t2 < t can enable the grille 6 to 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 impact of the air flow 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 corresponding to the head 1011 constitutes a first trapezoidal surface, and the cross section corresponding to the tail 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 outline of the head 1011, and the short side of the second trapezoidal surface constitutes a partial outline of the tail 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 portion 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 portion 1012 is the distance from the short side to the long side of the second trapezoidal surface, 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 an approximate double trapezoidal surface, such as Figure 7 As shown, in the double trapezoidal surface, there is an arc angle between the waistline and the corresponding bottom edge. The airflow in the air cavity of the main air duct 4 first contacts the head 1011. The head 1011 changes the direction of the airflow, thereby breaking up the vortex. 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. The airflow is diverted and the airflow direction is changed when it flows through the head 1011. The width of the tail 1012 along the air flow direction in the air conditioner gradually decreases, which can quickly restore the broken airflow to circulation, thereby avoiding excessive air volume loss. Figure 9As shown, after adding the grille 6 to the bottom of the air outlet frame 5 and assembling it on the whole machine to test the noise, the noise of the whole machine is improved compared with before adding the grille 6, and the abnormal sound of uneven air flow disappears. The grille 6 composed of the first grille bars 10 can not only solve the problem of uneven air flow 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. Furthermore, the double trapezoidal surface makes the head 1011 smaller than the tail 1012. The head 1011, which contacts the airflow first, quickly disperses the airflow, and the dispersion process is relatively short. The tail 1012 cooperates with the head 1011 to quickly restore the dispersed airflow. The airflow recovery channel is formed between the adjacent tails 1012 on the grille 6 for airflow. The longer airflow channel is more conducive to the stable recovery of airflow, achieving good aerodynamic performance of the grille as a whole, and can make the grille 6 have a suitable flow cross-section for airflow. At the same time, it ensures that the grille bar body has sufficient strength to withstand 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 side includes a first leeward side 111, a second leeward side 112 and a third leeward side 113;

[0090] 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 .

[0091] In this embodiment, the radius of the arc chamfer of the head portion 1011 is r1, and the radius of the arc chamfer of the tail portion 1012 is r2. The two arc chamfers further reduce the flow resistance of the head portion 1011 and the tail portion 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 of the grille 6 close to the fan 403 and the center of the axis of the fan 403 is t3, where 400 mm ≤ t3 ≤ 700 mm.

[0095] In this 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, 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 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. As a result, 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] Example 2

[0098] This embodiment provides a cabinet unit, including:

[0099] The air duct structure in Example 1.

[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 internal flow field of 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, causing the air flow direction to change, thereby breaking up the vortex. The air flow blown out of the air duct passes through the grille 6 and then blows into the air outlet frame 5, reducing the pressure difference between the two and 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 direction of air flow in the air conditioner gradually increases, and the cross-sectional width of the tail 1012 along the direction of air flow 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 direction of air flow in the air conditioner gradually decreases, which can quickly restore the dispersed air flow to circulation, thereby avoiding excessive air volume loss. Figure 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. 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 its flow, which breaks up the vortex. The airflow blown out from the main air duct passes through the grille and then blows into the outlet frame, reducing the pressure difference between the two, making the air outlet smoother, thereby effectively eliminating abnormal sounds. Installing the grille 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] Second, 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 vortex zone formation. In this way, the grille can achieve efficient rectification in the air duct and effectively reduce the probability of vortex zone generation.

[0104] Third, 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, which can quickly restore the circulation of the dispersed airflow, 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] Fourth, the height of the head part of 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 to flow. 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 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 subjected to the impact of airflow without producing abnormal sound.

[0107] Sixth, the overall height of the grille bar body is designed 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.

[0108] It is further understood that in the present disclosure, "plurality" refers to two or more than two, and other quantifiers are similar. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the related objects before and after 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.

[0109] It will be further understood that the terms "first," "second," and the like are used to describe various types of information, but such information should not be limited to these terms. These terms are used solely to distinguish information of the same type from one another and do not indicate a particular order or level of importance. In fact, the terms "first," "second," and the like are fully interchangeable. For example, first information could be referred to as second information, and similarly, second information could be referred to as first information without departing from the scope of this disclosure.

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

[0111] Other embodiments of the present disclosure will readily occur to those skilled in the art after considering the specification and practicing the utility model 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 not disclosed herein. The description and examples are to be considered as exemplary only, with the true scope and spirit of the present disclosure being indicated by the following claims.

[0112] It should be understood that the present disclosure is not limited to the exact structures 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) communicating with the air cavity; A fan (403), the fan (403) being arranged in the air cavity of the main air duct (4), and the fan (403) operating 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), the grille (6) being 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 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 include 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 width of the grille bar body along its cross section gradually increases along the airflow flow direction on its head portion, and gradually decreases along the airflow flow direction on its tail portion. The airflow flow direction is 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 direction of fluid flow, the portion extending from the maximum width position in the direction of fluid outflow is the tail portion (1012), and the portion extending from the maximum width position in the direction of fluid inflow 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 corresponding to the head (1011) constitutes a first trapezoidal surface, and the cross section corresponding to the tail (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 outline of the head (1011), and the short side of the second trapezoidal surface constitutes a partial outline of the tail (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 between the short side of the first trapezoidal surface and the long side, which is h1; the length of the tail portion (1012) is the distance between the short side of the second trapezoidal surface and 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 includes a first windward surface (901), a second windward surface (902), and a third windward surface (903); The leeward surface includes a first leeward surface (111), a second leeward surface (112), and a third leeward surface (113); There are arc chamfers between the first windward surface (901), the second windward surface (902) and the third windward surface (903), and there are arc chamfers between the first leeward surface (111), the second leeward surface (112) and the third leeward surface (113).

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 400mm≤t3≤700mm.

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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