Flow guide grid, flow channel assembly and air conditioner

Abstract

The utility model provides a flow guide grid, a flow channel assembly and an air conditioner, and belongs to the field of air supply equipment. The flow guide grid comprises a plurality of grid bars which are arranged side by side at intervals, and the inflow ends of the grid bars which are arranged side by side form an arc-shaped inflow face. The flow guide grid is installed at the reversing position of the flow channel, and the flow inlet ends of the grid bars arranged side by side in the flow guide grid form the arc-shaped flow inlet face, so that the airflow attack angles of the grid bars tend to be consistent when airflow passes through the flow guide grid, the air speed distribution uniformity of an outlet of the flow channel is improved, the pressure loss is reduced, and the air outlet amount of the flow channel is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of air supply equipment, in particular to a guide grid, a flow channel component, an air conditioner and a method for improving the uniformity of flow outflow from the flow channel. Background Art

[0002] The guide grid uses the wall flow and separation flow formed on the flow surface of the grid after the airflow passes through the grid to change the flow state and flow direction of the fluid in the flow channel.

[0003] When a traditional air conditioner supplies air, the conventional grille is generally a flat grille, that is, the grille inlet and grille outlet are on the same plane. When the airflow direction in the air duct is parallel to the guide grille, the cross-sectional flow velocity distribution is relatively uniform after the air flow passes through the grille. At this time, the pressure loss of the grille is low, and the uniform flow velocity distribution is conducive to improving the air guiding effect.

[0004] However, when the outflow direction in the air duct forms a certain angle with the guide grille, there is an airflow attack angle, and the flow velocity distribution on the grille outlet surface is uneven, the rectification effect is poor in the low flow velocity area, and the pressure loss in the high flow velocity area is large. In addition, during the rectification process, the upper flow wall of the grille separates and generates a large number of vortices, which leads to increased air conditioning pressure loss and attenuation of air volume, affecting the performance of the fan. Utility Model Content

[0005] In order to overcome the problem in the related art that when the outflow direction in the air duct of the air conditioner and the guide grille have a certain angle, the flow velocity distribution on the grille outlet surface is uneven, resulting in poor rectification effect in the low flow velocity area and large pressure loss in the high flow velocity area, and a large number of vortices are generated when the upper flow wall of the grille separates during the rectification process, resulting in increased air conditioning pressure loss, attenuation of air volume, and affecting the performance of the fan, the embodiment of the present utility model proposes a guide grille, a flow channel assembly and an air conditioner. By installing the guide grille at the flow channel reversing position and forming the inlet ends of multiple bars arranged side by side in the guide grille into an arc-shaped inlet surface, the airflow attack angle of each bar can be made consistent when the airflow passes through the guide grille, thereby improving the uniformity of the wind velocity distribution at the flow channel outlet, reducing pressure loss and increasing the flow channel air volume.

[0006] The first embodiment of the present invention proposes a guide fence for installation at a reversing position in a flow channel. The guide fence includes a plurality of bars arranged side by side and at intervals, and the inlet ends of the plurality of bars arranged side by side form an arc-shaped inlet surface.

[0007] In the above technical solution, the deviation value of the incident angle or the airflow attack angle between any two of the plurality of grating bars is within the range of {0° to 20°}.

[0008] In the above technical solution, the sub-channel formed by every two adjacent bars can cause the reversing airflow flowing through to generate a separation flow on the upper wall of the sub-channel and a wall attachment flow on the lower wall of the sub-channel.

[0009] In the above technical solution, the deviation between the wedge direction of the inlet end of the grid bar and the inlet direction of the fluid is within the range of {0°~30°};

[0010] The shape of the inlet surface of the guide fence is adapted to the cross-sectional shape of the inlet surface of the guide fence.

[0011] In the above technical solution, the interval a between two adjacent bars is designed to be a=k*vmax, where vmax is the maximum flow velocity of the airflow in the flow channel where the guide grid is located, the unit of vmax is m / s, the unit of the interval a is mm, and K is a fitting coefficient with a value less than 1.5.

[0012] In the above technical solution, the grid bar spacing of the guide grid is a, the grid bar length is L, and the grid bar thickness is d;

[0013] The length L of the grid bar satisfies the formula: L = {kmin ~ kmax} * a. When the distance between the grid bar and the flow channel outlet is greater than a first preset value, the length L of the grid bar = kmin * a. When the distance between the grid bar and the flow channel outlet is less than or equal to the first preset value, the length L of the grid bar = kmax * a.

[0014] The thickness d of the grid bar is positively correlated with the length L of the grid bar, and the value range of the first preset value is between {20 mm and 40 mm}.

[0015] The second embodiment of the present invention provides a flow channel assembly, comprising a flow channel and a guide grid, wherein the flow channel comprises a flow channel inlet and a flow channel outlet, and the flow channel inlet and the flow channel outlet are not in the same direction;

[0016] The guide grid is arranged at a reversing position between the flow channel inlet and the flow channel outlet;

[0017] The guide grid is the guide grid mentioned in Example 1 of the present application.

[0018] In the above technical solution, the sub-channel formed by each two adjacent bars of the guide grid is designed so that the reversing airflow flowing through it generates a separation flow on the upper wall of the sub-channel and a wall-attachment flow on the lower wall of the sub-channel;

[0019] The upper end of the guide grid is located at the flow wall separation point A on the upper wall of the flow channel, and the lower end of the guide grid is located at the point B' on the lower wall of the flow channel. The point B' on the lower wall of the flow channel is located away from the flow channel outlet relative to the point B on the lower wall of the flow channel.

[0020] The position of point B on the lower wall of the flow channel is the intersection of the core velocity trajectory line AB passing through point A in the flow channel and the lower wall of the flow channel.

[0021] In the above technical solution, the deviation value between the inlet end wedge direction of the guide fence and the inlet direction of the guide fence is within the range of {0°~30°};

[0022] The arcuate inlet surface of the guide grid coincides with the inlet surface cross-sectional line AB' of the guide grid passing through points A and B'.

[0023] In the above technical solution, a coordinate system is established with point A as the center and the outflow direction of the flow channel as the x-axis direction of the coordinate system;

[0024] The tangent slopes of the inlet cross-section line AB' of the guide fence at each point are greater than or equal to the tangent slopes of the core velocity trajectory line AB at each point corresponding to the same y value.

[0025] In the above technical solution, the minimum distance from the connection position B' between the guide grid and the lower wall of the flow channel to the flow channel outlet is greater than the second preset value;

[0026] The lower wall surface of the flow channel is constructed as an upwardly inclined section from the side away from the flow channel outlet to the side close to the flow channel outlet, and the upward inclination angle β of the inclined section is between {1°-10°}.

[0027] In the above technical solution, the bars are fixedly arranged in the flow channel or the bars are adjustable in position; wherein

[0028] When the bars are fixedly arranged in the flow channel, the bars are inclined upward from the side away from the flow channel outlet to the side close to the flow channel outlet, and the upward inclination angle K of the bars is between {0° and 10°};

[0029] When the bars are adjustably arranged in the flow channel, the flow channel assembly further includes a driving mechanism that cooperates with the bars for transmission, and the driving mechanism is used to drive the bars to rotate so as to adjust the flow diversion direction of the bars.

[0030] A third embodiment of the present invention provides an air conditioner, which includes the above-mentioned flow channel assembly.

[0031] In the above technical solution, the air conditioner is a cabinet-type air conditioner, and the flow channel assembly is arranged at the bottom of the air conditioner;

[0032] The flow channel outlet in the flow channel assembly serves as the bottom air outlet on the front panel side of the air conditioner.

[0033] Embodiment 4 of the present invention provides a method for improving the uniformity of outflow from the flow channel reversal, wherein a guide gate with an arc-shaped inlet surface is set at the flow channel reversal position, and the arc-shaped inlet surface of the guide gate is matched with the core velocity trajectory line AB in the flow channel.

[0034] In the above technical solution, the method for matching the curved inlet surface of the guide fence with the core velocity trajectory includes:

[0035] The sub-flow channel formed by each two adjacent bars of the guide grid is designed so that the reversing airflow flowing through it generates a separation flow on its upper wall and a wall-attachment flow on its lower wall;

[0036] Make the upper end of the guide fence be at the flow wall separation point A on the upper wall of the flow channel;

[0037] The lower end of the guide grid is located at point B' on the lower wall of the flow channel, and the position of point B' on the lower wall of the flow channel is set away from the flow channel outlet relative to point B on the lower wall of the flow channel; and the arc-shaped inlet surface of the guide grid is coincident with the inlet surface cross-sectional line AB' of the guide grid passing through points A and B'.

[0038] In the above technical solution, the flow wall separation point A is obtained during the reversal of the flow channel airflow. According to the highest velocity isochoresistive line in the flow channel, the core velocity trajectory line AB in the flow channel is determined through point A. The point where the core velocity trajectory line AB intersects with the lower wall of the flow channel is point B.

[0039] Taking the core velocity trajectory line AB as a reference, the inlet surface cross-section line AB' of the curved guide fence is designed and the inlet surface cross-section line AB' of the curved guide fence is designed on the inlet side of AB;

[0040] The maximum flow velocity isochord is determined based on the isochords and the maximum flow velocity in the flow channel.

[0041] After adopting the above technical solution, the utility model has the following beneficial effects compared with the prior art:

[0042] The guide fence provided in the embodiment of the present invention is installed at the reversing position of the flow channel, and the inlet ends of multiple bars arranged side by side in the guide fence form an arc-shaped inlet surface, so that the airflow attack angle of each bar tends to be consistent when the airflow passes through the guide fence, thereby improving the uniformity of the wind speed distribution at the flow channel outlet, reducing pressure loss and increasing the air outlet volume of the flow channel. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] The accompanying drawings are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present invention, and together with the description, serve to explain the principles of the present invention.

[0044] Figure 1 It is the iso-velocity line diagram and velocity distribution cloud diagram when there is no guide fence inside the flow channel in the prior art.

[0045] Figure 2 Schematic diagram of the positional relationship between the inlet cross-section line AB' of the arc-shaped guide grid and the core velocity trajectory line in the embodiment of the flow channel assembly of the present utility model;

[0046] Figure 3 This is a schematic structural diagram of the flow channel assembly embodiment of the present invention when the arc-shaped guide grid is installed in the flow channel;

[0047] Figure 4 for Figure 3 Schematic diagram of the enlarged structure at A in the middle;

[0048] Figure 5 Schematic diagram of the parameter structure of the arc-shaped guide grid in the embodiment of the flow channel assembly of the present utility model;

[0049] Figure 6 This is a comparison chart of the wind speed distribution at the duct outlet when a conventional guide fence is used in the duct and when a curved guide fence is used in the duct;

[0050] Figure 7 This is the air supply velocity distribution cloud diagram when no arc guide fence is set in the flow channel;

[0051] Figure 8 This is the cloud diagram of the air supply velocity distribution after the arc-shaped guide fence is set in the flow channel;

[0052] Figure 9 This is a structural diagram of the flow channel assembly when installed in a cabinet air conditioner.

[0053] Among them: 1-flow channel; 111-flow channel inlet; 12a-flow channel upper wall; 12b-flow channel lower wall; 121-flow channel outlet; 2-guide grid; 21-grid bar; 22-sub-flow channel. DETAILED DESCRIPTION

[0054] Exemplary embodiments will be described in detail herein, with examples illustrated in the accompanying drawings. In the following description, when referring to the drawings, identical numerals in different figures represent identical or similar elements, unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all possible embodiments consistent with the present invention. Rather, they are merely examples of apparatuses and methods consistent with certain aspects of the present invention as detailed in the appended claims.

[0055] At present, there is a certain angle between the outflow direction in the air duct of the existing air conditioner and the guide grille, and the flow velocity distribution on the grille outlet surface is uneven, resulting in poor rectification effect in the low flow velocity area and large pressure loss in the high flow velocity area. In addition, the separation of the flow wall on the grille during the rectification process generates a large number of vortices, which leads to increased pressure loss of the air conditioner, attenuation of air volume, and impact on the performance of the fan. The embodiment of the present utility model proposes a guide grille, a flow channel assembly and an air conditioner, by arranging a guide grille in the flow channel assembly, determining the core velocity trajectory line through the flow wall separation point and the wind velocity isovelocity line of the wall of the attached flow channel during the air flow reversal process of the air duct, and designing the guide grille with the velocity trajectory line as the inlet surface of the guide grille, so that the airflow attack angle of each bar of the guide grille tends to be consistent, thereby improving the uniformity of the wind velocity distribution at the flow channel outlet, reducing pressure loss and increasing air volume.

[0056] The following is combined with Figure 1 -Attached Figure 9 The technical solution of this embodiment is described in detail. The following implementation methods and embodiments can be combined with each other unless there is any conflict.

[0057] Example 1

[0058] like Figures 1-9 As shown, the first aspect of the embodiment of the utility model proposes a guide fence, which is characterized in that it is used to be installed at the reversing position in the flow channel, and the guide fence 2 includes a plurality of bars 21 arranged side by side and at intervals, and the inlet ends of the plurality of bars 21 arranged side by side constitute an arc-shaped inlet surface.

[0059] The guide fence 2 provided in this embodiment forms an arc-shaped inlet surface by forming the three inlet ends of the guide fence 2. In this way, when the guide fence 2 is installed at the reversing position of the flow channel, the airflow attack angle of each bar 21 in the flow channel can be made consistent with α when the airflow passes through the guide fence 2, thereby improving the uniformity of the wind speed distribution at the flow channel outlet, reducing pressure loss, and increasing the air flow volume of the flow channel.

[0060] It is worth noting that the airflow attack angle α can also be called the airflow incident angle. Specifically, the airflow attack angle α refers to the angle formed between the airflow direction of the flow channel before the guide grid is rectified and the grid bar 21, such as Figure 5 shown.

[0061] Specifically, the deviation between the angle of incidence or the angle of attack of the airflow between any two of the plurality of bars 21 is within the range of {0° to 20°}. Preferably, the angle of incidence α or the angle of attack α between any two of the plurality of bars 21 are consistent. This allows the reversing airflow to be evenly distributed after passing through the guide fence 2, thereby improving the uniformity of the wind speed distribution at the flow channel outlet.

[0062] More specifically, the guide fence 2 is designed such that the sub-channel 22 formed by every two adjacent bars 21 can cause the reversing airflow flowing through to generate a separation flow on the upper wall of the sub-channel 22 and a wall attachment flow on the lower wall of the sub-channel 22 .

[0063] like Figure 2 and Figure 3As shown, when airflow enters the curved guide fence 2 from above, the upper bars 21 at the entrance partially block the lower bars 21. When the airflow passes through the upper bars 21, part of the airflow flows along the upper wall surface of the upper bars 21, while part of the airflow generates a separated flow and vortex on the lower wall surface of the upper bars 21, causing the separated flow to flow toward the lower bars 21. However, when the separated flow hits the lower bars 21, it merges with the attached flow on the upper wall surface of the lower bars 21 and then enters the flow channel between the upper and lower bars 21. Therefore, the separated flow on the lower wall surface of the upper bars 21 is suppressed, and the pressure loss caused by the vortex is reduced. When the air flow flows out from the upper wall of the upper grid bar 21, due to the wall attachment flow effect, the air flow continues to move downward, but because the wall attachment flow of the lower grid bar 21 has not yet ended, the air flow of the upper grid bar 21 is affected by the wall attachment flow of the lower grid bar 21, which inhibits the air flow from continuing to flow downward, thereby improving the reversing effect of the air flow. Based on the above effect, when the guide grid 2 is installed in an air supply device with a lower air outlet, it can prevent the air from blowing directly downward on the floor, thereby avoiding the generation of dust problems.

[0064] In any of the above embodiments, Figure 3 As shown, the bars 21 of the guide fence 2 are also designed such that the deviation between the wedge direction of the inflow end of the bars 21 and the inflow direction of the fluid is within the range of {0° to 30°};

[0065] The shape of the inlet surface of the guide fence 2 is adapted to the cross-sectional shape of the inlet surface of the guide fence 2. When the airflow enters the arc-shaped guide fence 2, wall flow and separation flow are generated on the upper and lower wall surfaces of the bars 21, respectively. The vortex formed by the separation flow is the key factor causing pressure loss. By designing the inlet end of the guide fence bars 21 with a slanted split, the separation flow on the lower wall can be weakened, thereby reducing resistance. Figure 4 The figure shows the oblique split structure of the arc-shaped guide grid bars 21. Preferably, the oblique split direction of the inlet end of the bars 21 is parallel to the inflow direction of the fluid, that is, it coincides with the inlet surface section AB' of the arc-shaped guide grid as much as possible.

[0066] It should be noted that the inclined design of the inlet end of the grid bar 21 mentioned in this embodiment is to set an inclined surface at the inlet end of the grid bar 21. Figure 4 As shown, the grating 21 includes a leeward side close to the flow channel outlet 121 and a windward side away from the flow channel outlet 121; the windward side of the grating 21 includes an upper end close to the flow wall separation point A and a lower end away from the flow wall separation point A; wherein the windward side of the grating 21 is constructed as an inclined surface inclined toward the flow channel outlet 121 from the upper end position to the lower end position, and the inclined surface forms an angle b of 0° to 90° with the flow direction of the second airflow.

[0067] In any of the above embodiments, Figure 5As shown, the interval a between two adjacent bars 21 is designed to be a=k*vmax, where vmax is the maximum flow velocity of the airflow in the flow channel where the guide fence 2 is located, the unit of vmax is m / s, the unit of a is mm, and K is a fitting coefficient with a value less than 1.5.

[0068] That is, the distance a between two adjacent bars 21 is determined based on the airflow velocity range in the air duct before commutation, thereby ensuring the airflow and airflow uniformity effect of the curved guide grid. Preferably, when the maximum airflow velocity in the air duct is less than 20m / s, the bar spacing a is 5mm to 25mm. When the maximum airflow velocity in the air duct is 15m / s, the optimal bar spacing is 15mm.

[0069] In any of the above embodiments, Figure 5 As shown, the interval between the bars 21 of the guide fence 2 is a, the length of the bars 21 is L, and the thickness of the bars 21 is d;

[0070] The length L of the bar 21 satisfies the formula: L = {kmin ~ kmax} * a. When the distance between the bar 21 and the flow channel outlet 121 is greater than the first preset value, the length L of the bar 21 = kmin * a. When the distance between the bar 21 and the flow channel outlet 121 is less than or equal to the first preset value, the length L of the bar 21 = kmax * a. Preferably, kmin is 0.3 and kmax is 2. The first preset value can be any value between 15 mm and 25 mm. Preferably, when the guide section from the guide bar to the flow channel outlet is greater than 20 mm, L takes a smaller value, otherwise L takes a larger value.

[0071] The thickness d of the bars 21 is positively correlated with the length L of the bars 21. That is, to ensure the strength of the bars 21, the longer the length L of the bars 21, the thicker the thickness d should be. Preferably, the thickness d of the bars 21 is 3 mm to 6 mm. To ensure adequate diversion, the first preset value is in the range of {20 mm to 40 mm}.

[0072] In summary, in this embodiment, by designing the structure and parameters of the guide fence, when the above-mentioned guide fence 2 is installed at the reversing position in the flow channel, the uniformity of the wind speed distribution at the flow channel outlet can be improved, the pressure loss of the air flow when flowing in the flow channel can be reduced, and the air output can be increased.

[0073] Example 2

[0074] This embodiment provides a flow channel assembly, which includes a flow channel 1 and a guide gate 2. The flow channel 1 includes a flow channel inlet 111 and a flow channel outlet 121, and the flow channel inlet 111 and the flow channel outlet 121 are not in the same direction;

[0075] The guide gate 2 is arranged at a reversing position between the flow channel inlet 111 and the flow channel outlet 121;

[0076] The guide grid is the guide grid mentioned in Example 1.

[0077] In this embodiment, by setting the guide fence 2 mentioned in Example 1 in the flow channel, the airflow in the flow channel can make the airflow attack angle of each bar tend to be consistent when passing through the guide fence 2, thereby improving the uniformity of the wind speed distribution at the flow channel outlet, reducing pressure loss and increasing the air output of the flow channel.

[0078] It should be noted that the “reversing position” mentioned in this embodiment is not a precise point, but an area where the flow direction of the fluid suddenly changes when flowing in the flow channel.

[0079] Specifically, such as Figure 3 As shown, the interior of the flow channel is defined by a first flow channel for allowing the airflow to flow downward and a second flow channel for allowing the airflow to flow to the right. The first flow channel and the second flow channel are fluidly connected, and the first flow channel is formed with a flow channel inlet 111 and the second flow channel is formed with a flow channel outlet 121, so that the airflow can change from vertical flow to horizontal flow when entering the second flow channel from the first flow channel.

[0080] Furthermore, the sub-channel 22 formed by each two adjacent bars 21 of the guide fence 2 is designed so that the reversing airflow passing through it generates a separation flow on the upper wall of the sub-channel 22 and a wall-attachment flow on the lower wall of the sub-channel 22; Figure 2 and Figure 3 As shown, when airflow enters the curved guide fence 2 from above, the upper bars 21 at the entrance partially block the lower bars 21. When the airflow passes through the upper bars 21, part of the airflow flows along the upper wall surface of the upper bars 21, while part of the airflow generates a separated flow and vortex on the lower wall surface of the upper bars 21, causing the separated flow to flow toward the lower bars 21. However, when the separated flow hits the lower bars 21, it merges with the attached flow on the upper wall surface of the lower bars 21 and then enters the flow channel between the upper and lower bars 21. Therefore, the separated flow on the lower wall surface of the upper bars 21 is suppressed, and the pressure loss caused by the vortex is reduced. When the airflow flows out from the upper wall surface of the upper grid bar 21, due to the wall flow effect, the airflow continues to move downward, but because the wall flow of the lower grid bar 21 has not yet ended, the airflow of the upper grid bar 21 is affected by the wall flow of the lower grid bar 21, which inhibits the airflow from continuing to flow downward, thereby improving the reversing effect of the airflow. Based on the above effect, when the guide grid 2 is installed in the air supply equipment with a lower air outlet, it can prevent the air from blowing directly downward on the floor, thereby avoiding the problem of dust generation;

[0081] The upper end of the guide fence 2 is located at the flow wall separation point A on the upper wall surface 12a of the flow channel, and the lower end of the guide fence 2 is located at the point B' on the lower wall surface 12b of the flow channel. The point B' on the lower wall surface 12b of the flow channel is located away from the flow channel outlet 121 relative to the point B on the lower wall surface 12b of the flow channel.

[0082] The position of point B on the lower wall surface 12b of the flow channel is the intersection point of the core velocity trajectory line AB passing through point A in the flow channel 1 and the lower wall surface 12b of the flow channel.

[0083] That is, the guide gates in this embodiment are set with reference to the core velocity trajectory line AB. The core velocity line AB serves as the boundary, and the velocities on both sides of the core velocity trajectory line AB decrease. The difference is that one side is defined as the inlet side, and the other side is defined as the outlet side. The outlet side indicates that the fluid has completed the flow separation process. At this time, adding a curved guide gate to the outlet side will reduce the impact on the flow direction and eddy resistance during the flow separation process. Setting a curved guide gate on the inlet side can provide buffering and rectification, change the airflow angle of attack, and suppress flow separation during or before flow separation, thereby achieving the effect of uniform wind and drag reduction.

[0084] It should be noted that the "flow-wall separation" mentioned in this embodiment also refers to "boundary layer flow separation," which refers to the phenomenon where a fluid's internal flow is restricted by the channel walls. When the fluid passes over a solid surface, the sudden change in the solid surface's shape causes changes in the fluid's internal structure, leading to eddies and separation at the point where the fluid leaves the boundary. The "flow-wall separation point," or "boundary layer flow separation point," is located near the location where the wall suddenly changes and the flow cross-section suddenly expands. In other words, the "flow-wall separation point" is the point where the velocity between the fluid and the wall drops to zero and significant backflow occurs.

[0085] It should also be noted that core velocity trajectory AB is drawn based on the highest velocity isovelocity line within flow channel 1. It lies near and approximately parallel to the highest velocity isovelocity line within the flow channel passing through point A, primarily representing the maximum velocity line or region within the flow channel. The industry has a well-established formula and definition for the core velocity trajectory of a jet, which is a trajectory drawn from the center of each fluid cross-section of the jet. This indicates that the core velocity trajectory represents the fastest flow and the lowest pressure decay.

[0086] It should also be noted that the above-mentioned "maximum flow velocity isovelocity line" refers to the isovelocity line diagram drawn at the outlet position of the flow channel, and the isovelocity line {or isovelocity line range} composed of the maximum wind speed {or maximum wind speed range} is the maximum flow velocity isovelocity line {or maximum flow velocity isovelocity line range}, and the isovelocity line and the maximum flow velocity are common knowledge in this field. In this embodiment, the isovelocity line and the maximum flow velocity are not explained in detail.

[0087] It should also be noted that if Figure 2 and Figure 3As shown, the aforementioned "airflow velocity at any point on core velocity trajectory AB is the maximum velocity when flowing horizontally" means that when airflow in the same vertical direction flows horizontally, the velocity is at its maximum when it intersects core velocity trajectory AB. That is, at the same height, the velocity of the airflow to the left of core velocity trajectory AB decreases as the velocity of the airflow to the right of core velocity trajectory AB.

[0088] In any of the above embodiments, the deviation between the inlet end wedge direction of the guide fence 2 and the inlet direction of the guide fence 2 is in the range of {0° to 30°};

[0089] The curved inlet surface of the guide fence 21 coincides with the inlet surface cross-section line AB' of the guide fence 21 passing through points A and B'. When the airflow enters the curved guide fence 2, wall flow and separation flow are generated on the upper and lower wall surfaces of the bars 21, respectively. The vortex formed by the separation flow is the key factor causing pressure loss. By designing the inlet end of the guide fence bars 21 with a slanted split, the separation flow on the lower wall can be weakened, thereby reducing resistance. Figure 4 The figure shows a schematic diagram of the oblique split structure of the arc-shaped guide grid bar 21. Preferably, the oblique split direction of the inlet end of the grid bar 21 tends to be parallel to the inlet direction of the fluid, that is, it is as close as possible to the cross-section AB' of the inlet surface of the arc-shaped guide grid. It should be noted that the oblique split design of the inlet end of the grid bar 21 mentioned in this embodiment can be understood as setting an inclined slope at the inlet end of the grid bar 21. Specifically, as Figure 4 As shown, the grating 21 includes a leeward side close to the flow channel outlet 121 and a windward side away from the flow channel outlet 121; the windward side of the grating 21 includes an upper end close to the flow wall separation point A and a lower end away from the flow wall separation point A; wherein the windward side of the grating 21 is constructed as an inclined surface inclined toward the flow channel outlet 121 from the upper end position to the lower end position, and the inclined surface forms an angle b of 0°-90° with the flow direction of the second airflow.

[0090] In any of the above embodiments, Figure 2 As shown, a coordinate system is established with point A as the center and the outflow direction of the flow channel as the x-axis direction of the coordinate system;

[0091] The tangent slopes of the inlet cross-section line AB' of the guide fence 2 at each point are greater than or equal to the tangent slopes of the core velocity trajectory line AB at each point corresponding to the same y value.

[0092] In the embodiment of the present invention, an arc-shaped guide fence 2 is set in the air duct housing 1, and the core velocity trajectory line AB is determined by the flow wall separation point A during the airflow reversing process in the flow channel 1 and the wind speed isokinetic line on the wall surface of the wall-attached flow channel. The arc-shaped guide fence 2 is designed with the core velocity trajectory line AB as the inlet surface of the arc-shaped guide fence, so that the airflow attack angle of each bar of the guide fence tends to be consistent, thereby improving the uniformity of the wind speed distribution at the flow channel outlet, reducing pressure loss and increasing air volume.

[0093] Specifically, such as Figure 2 As shown, along the y-axis of the coordinate system, the arc guide gate inlet cross-section line AB' and the core velocity trajectory line AB have the same y value. The angle change △ between any point C' and the tangent line C'D of C, the tangent line CD and the horizontal plane is between {0°-30°}, and the distance between C' and C is positively correlated with the absolute value of the y value.

[0094] The position of any point on the inlet cross-sectional line AB′ of the arc-shaped guide gate is close to the flow channel outlet 121 relative to the flow wall separation point A.

[0095] The reason why the angle variation Δ is controlled within the range of {0°-30°} in the embodiment of the present invention is to avoid excessive angle variation, which would cause the incident angle or airflow attack angle of each grid bar 21 to differ too much, thereby causing excessive local resistance loss and affecting the uniformity of wind speed and the drag reduction effect of the guide grid. Figure 6 Schematic diagram and effect of the airflow incident angle of each guide grille marked with yellow lines in the first two figures.

[0096] Through the above settings, the inlet cross-sectional line AB' of the arc-shaped guide fence 2 can be determined, thereby determining the shape and installation position of the arc-shaped guide fence 2, and then the incident angle or the airflow attack angle when the airflow passes through the bars can be made consistent, the guide fence 2 can evenly distribute the airflow, and the uniformity of the wind speed distribution at the flow channel outlet can be improved. Figure 2 As shown, the air velocity distribution is significantly more uniform than when no guide grille 2 is present. In actual design, the position of the curved grille inlet surface AB' is adjusted based on the wind velocity distribution measured at the duct outlet 121 to achieve uniform air flow and maximize airflow. The incident angle α, or angle of attack, refers to the angle between the airflow direction in the duct and the bars before the grille is rectified.

[0097] In any of the above embodiments, in order to ensure the airflow reversing effect and ensure horizontal or upward airflow, the distance from the bottom point B' of the arc-shaped guide fence 21 to the flow channel outlet 121 is greater than or equal to the second preset value to ensure that a stable flow can be formed after the grid is rectified, wherein the second preset value can be any value between 10mm and 15mm. Preferably, the second preset value is 10mm.

[0098] The flow channel lower wall surface 12b is constructed as an upwardly inclined section from the side away from the flow channel outlet 121 to the side close to the flow channel outlet 121, and the upward inclination angle β of the inclined section is between {1°-10°}.

[0099] When the flow channel outlet 121 in the above-mentioned air channel structure is used as the downflow port of a cabinet air conditioner, in order to take into account both cooling and heating effects, preferably, the upward inclination angle β of the inclined section is set to 2°.

[0100] In any of the above embodiments, the bars 21 are fixedly arranged in the flow channel 1 or the position of the bars 21 is adjustable in the flow channel 1; wherein

[0101] When the bars 21 are fixedly arranged in the flow channel 1, the bars 21 are tilted upward from the side away from the flow channel outlet 121 to the side close to the flow channel outlet 121, and the upward tilt angle K of the bars 21 is between {0° and 10°}; preferably, when the flow channel outlet 121 in the above-mentioned flow channel assembly is used as the downwind outlet of the cabinet air conditioner, in order to take into account the cooling and heating effects, the bars 21 can be set slightly upward, and specifically, the angle K between the bars 21 and the horizontal direction can be set to about 3°.

[0102] Of course, in some embodiments not shown in the figure, the air guide direction of the grating 21 can also be determined according to the actual required air guide direction, that is, a motion structure can be added and replaced with a motion air guide plate to adjust the required air guide direction in real time. When the grating 21 is rotatably arranged in the air duct housing 1, the flow channel assembly also includes a driving mechanism that cooperates with the grating 21, and the driving mechanism is used to drive the grating 21 to rotate to adjust the air guide direction of the grating 21. Preferably, when it is necessary to guide the air upward, the grating 21 can be controlled to rotate so that the upward inclination angle of the grating 21 is maintained between {0° and 30°}. When it is necessary to take into account the cooling and heating effects and avoid the air flow blowing on the ground, the grating 21 can be controlled to rotate so that the upward inclination angle of the grating 21 is maintained between {0° and 10°}.

[0103] Example 3

[0104] like Figure 9 As shown, this embodiment provides an air conditioner, which includes the above-mentioned flow channel assembly.

[0105] Preferably, the air conditioner is a cabinet air conditioner, and the flow channel assembly is arranged at the bottom of the air conditioner;

[0106] The flow channel outlet 121 in the flow channel assembly serves as a downdraft outlet at the bottom of the front panel side of the air conditioner.

[0107] More specifically, the cabinet air conditioner further includes a fan disposed inside the air conditioner, the fan having a fan outlet for discharging air downward, a first flow channel disposed vertically, a second flow channel disposed horizontally, an upper end of the first flow channel forming an air inlet, and a lower end communicating with the horizontally disposed second flow channel;

[0108] The air outlet of the fan is in fluid communication with the air inlet of the first flow channel fluid.

[0109] It is worth noting that, in some alternative embodiments, the above-mentioned flow duct assembly can also be set in other types of air supply equipment, which can also achieve the same technical effect as the embodiment of the present application. In this embodiment, for the sake of convenience, the specific effect is described by taking the application object of the flow duct assembly as a cabinet air conditioner as an example.

[0110] When the cabinet air conditioner in this embodiment adopts the above-mentioned flow channel assembly, its air outlet effect may be different from that of the existing air conditioner in the following ways:

[0111] Attachment Figure 6 The figure shows a comparison of the wind speed distribution cloud diagrams at the outlet of the curved guide grille 2 and a conventional guide grille. With a conventional guide grille, the wind speed is concentrated at the bottom. After being diverted by the grille, the airflow tends to be downward, and the airflow angle gradually increases from top to bottom. The grille wall flows downward, generating significant vortices. Without the added wedge design at the inlet end of the curved guide grille 2, the wind speed is concentrated in the middle and bottom. After the grille diverts the airflow horizontally or upward, the airflow angle of attack remains essentially the same. The wall flows downward after the grille diverts the airflow, and the influence of the wall flow below results in horizontal airflow and reduced vortices. The inlet side of the bars lacks diverter chamfers, and the separated flow flows downward, generating vortices. With the added wedge design of the curved guide grille, the bars have diverter chamfers on the inlet side, allowing the separated flow to enter the flow channel smoothly, reducing vortices, and achieving more uniform outlet wind speeds with less losses.

[0112] Combined with attachment Figure 1 From the cloud diagram of the wind speed distribution without a guide grille, it can be seen that setting a conventional straight grille at the flow wall separation point A in flow channel 1 can make the wind speed at the flow channel outlet tend to be uniform, but the wind speed at the bottom of the flow channel is still significantly higher than that at other positions. There is still a downward flow trend at the outlet of each grille bar, and the uniform wind effect is general. It cannot significantly reduce the pressure loss caused by the airflow impacting the duct wall. The airflow reversing effect depends on the guide end from the outflow side of the grille to the flow channel outlet.

[0113] If an arc-shaped guide grid is used, the problem of concentrated airflow impacting the bottom of the air duct can be significantly improved. The wind speed distribution at the outlet of the duct will be more uniform, the pressure loss will be smaller, the airflow reversing effect will be less dependent on the bottom guide section, and the air guiding effect will be better.

[0114] Attachment Figure 9 and attached Figure 8Shown is the velocity distribution cloud map of the room with and without an arc-shaped guide fence at the downwind outlet of this application. It can be seen that the use of an arc-shaped guide fence can lift the wind upward, avoid the air supply blowing directly on the floor, reduce heat waste on geothermal heat, and avoid the risk of dust blowing.

[0115] Example 4

[0116] This embodiment provides a method for improving the uniformity of outflow when the flow channel is switched, the method comprising:

[0117] A guide gate with an arc-shaped inlet surface is provided at the flow channel reversing position, and the arc-shaped inlet surface of the guide gate is matched with the core velocity trajectory line AB in the flow channel.

[0118] In this embodiment, by setting a guide grid with an arc-shaped inlet surface at the flow channel reversing position, the problem of concentrated airflow impacting the bottom of the flow channel can be significantly improved. The wind speed distribution at the flow channel outlet is more uniform, the pressure loss is smaller, the airflow reversing effect is less dependent on the bottom guide section, and the wind guiding effect is better.

[0119] Furthermore, the method for matching the guide fence inlet surface with the core velocity trajectory line includes:

[0120] The sub-channel formed by each two adjacent bars of the guide grid is designed so that the reversing airflow passing through it generates a separation flow on its upper wall surface and a wall flow on its lower wall surface. When the airflow enters the curved guide grid 2 from above, the upper bars 21 at the entrance partially block the lower bars 21. When the airflow passes through the upper bars 21, part of the airflow flows along the upper wall surface of the upper bars 21 and flows along the wall surface, while part of the airflow generates a separation flow and vortex on the lower wall surface of the upper bars 21, causing the separation flow to flow toward the lower bars 21. However, when the separation flow impacts the lower bars 21, it merges with the wall flow on the upper wall surface of the lower bars 21 and then enters the flow channel between the upper and lower bars 21. Therefore, the separation flow on the lower wall surface of the upper bars 21 is suppressed, and the pressure loss caused by the vortex is reduced. When the airflow flows out from the upper wall surface of the upper grid bar 21, due to the wall flow effect, the airflow continues to move downward, but because the wall flow of the lower grid bar 21 has not yet ended, the airflow of the upper grid bar 21 is affected by the wall flow of the lower grid bar 21, which inhibits the airflow from continuing to flow downward, thereby improving the reversing effect of the airflow. Based on the above effect, when the guide grid 2 is installed in the air supply equipment with a lower air outlet, it can prevent the air from blowing directly downward on the floor, thereby avoiding the problem of dust generation;

[0121] The upper end of the guide fence is located at the flow wall separation point A on the upper wall of the flow channel; the lower end of the guide fence is located at the point B' on the lower wall of the flow channel, and the point B' on the lower wall of the flow channel is located away from the flow channel outlet 121 relative to the point B on the lower wall of the flow channel; and the arc-shaped inlet surface of the guide fence 21 coincides with the inlet surface cross-sectional line AB' of the guide fence 21 passing through points A and B'.

[0122] Furthermore, the flow wall separation point A is obtained during the reversal of the flow channel airflow. According to the highest velocity isochord in the flow channel, the core velocity trajectory line AB in the flow channel is determined through point A. The point where the core velocity trajectory line AB intersects with the lower wall of the flow channel is point B.

[0123] Taking the core velocity trajectory line AB as a reference, the inlet surface cross-section line AB' of the curved guide fence is designed and the inlet surface cross-section line AB' of the curved guide fence is designed on the inlet side of AB;

[0124] The maximum flow velocity isochord is determined based on the isochords and the maximum flow velocity in the flow channel.

[0125] That is, in this embodiment, based on the streamlines and velocity distribution between the flow wall separation point A and the flow surface attached to the duct wall during the reversal of the flow in the flow channel, an arc-shaped guide fence 2 is designed along the core velocity trajectory line AB, so that the airflow is rectified through the guide fence 2 in sequence, and the change of the airflow state on the inlet side is avoided to the greatest extent. At the same time, the flow velocity distribution at the flow channel outlet after rectification by the guide fence 2 is uniform, thereby reducing the wall impact resistance loss in the high-speed area and the eddy current loss in the low-speed area, improving the air guiding effect, reducing the flow resistance, and increasing the air volume of the air conditioner.

[0126] The explanations of the flow wall separation point A, the core velocity trajectory line AB and the maximum velocity constant line can refer to the explanations in Example 1, Example 2 and Example 3.

[0127] Those skilled in the art will readily recognize other embodiments of the present invention after considering the specification and practicing the embodiments disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present invention that follow from the general principles of the present invention and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered as exemplary only, with the true scope and spirit of the present invention being indicated by the following claims.

[0128] It should be understood that the present invention is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

Claims

1. A guide fence, characterized in that: The guide fence (2) is used for installation at a reversing position in a flow channel. The guide fence (2) comprises a plurality of bars (21) arranged side by side and at intervals. The plurality of inlet ends of the plurality of bars (21) arranged side by side and at intervals together form an arc-shaped inlet surface.

2. The guide fence according to claim 1, characterized in that: The deviation value of the incident angle or airflow attack angle of any two adjacent grating bars (21) among the plurality of grating bars (21) is within the range of {0° to 20°}.

3. The guide fence according to claim 1, characterized in that: The sub-channel (22) formed by each two adjacent grating bars (21) can cause the reversing airflow flowing through the sub-channel (22) to generate a separation flow on the upper wall surface of the sub-channel (22) and a wall attachment flow on the lower wall surface of the sub-channel (22).

4. The guide fence according to claim 1, characterized in that: The deviation value between the wedge direction of the inlet end of the grating bar (21) and the inlet direction of the fluid is within the range of {0° to 30°}; The shape of the inlet surface of the guide fence (2) is adapted to the cross-sectional shape of the inlet surface of the guide fence (2).

5. The guide fence according to claim 1, characterized in that: The interval a between two adjacent grating bars (21) is designed to be a=k*vmax; Wherein vmax is the maximum velocity of the airflow in the flow channel where the guide grid (2) is located, the unit of vmax is m / s, the unit of the interval a is mm, and K is a fitting coefficient with a value less than 1.

5.

6. The guide fence according to claim 1, characterized in that: The spacing between the bars (21) of the guide fence (2) is a, the length of the bars (21) is L, and the thickness of the bars (21) is d; wherein The length L of the grating (21) satisfies the formula: L={kmin~kmax}*a. When the distance between the grating (21) and the flow channel outlet (121) is greater than a first preset value, the length L of the grating (21)=km i n*a, when the distance between the grating (21) and the flow channel outlet (121) is less than or equal to a first preset value, the length L of the grating (21) is kmax*a; The thickness d of the grid bar (21) is positively correlated with the length L of the grid bar (21), and the value range of the first preset value is between {20 mm and 40 mm}.

7. A flow channel assembly, characterized in that: The invention comprises a flow channel (1) and a flow guide grid (2), wherein the flow channel (1) comprises a flow channel inlet (111) and a flow channel outlet (121), and the flow channel inlet (111) and the flow channel outlet (121) are not in the same direction; The guide fence (2) is arranged at a reversing position between the flow channel inlet (111) and the flow channel outlet (121); The guide grid is the guide grid according to any one of claims 1 to 6.

8. The flow channel assembly according to claim 7, characterized in that: The sub-channel (22) formed by every two adjacent bars (21) of the guide fence (2) is designed so that the reversing airflow flowing through it generates a separation flow on the upper wall surface of the sub-channel (22) and a wall-attachment flow on the lower wall surface of the sub-channel (22); The upper end of the guide grid (2) is located at a flow wall separation point A on the upper wall surface (12a) of the flow channel, and the lower end of the guide grid (2) is located at a point B' on the lower wall surface (12b) of the flow channel, and the point B' on the lower wall surface (12b) of the flow channel is located away from the flow channel outlet (121) relative to the point B on the lower wall surface (12b) of the flow channel. The position of point B on the lower wall surface (12b) of the flow channel is the intersection point of the core velocity trajectory line AB passing through point A in the flow channel (1) and the lower wall surface (12b) of the flow channel.

9. The flow channel assembly according to claim 7, characterized in that: The deviation value between the oblique wedge direction of the inflow end of the guide fence (2) and the inflow direction of the guide fence (2) is within the range of {0° to 30°}; The arcuate inlet surface of the guide fence (2) coincides with the inlet surface cross-sectional line AB' of the guide fence (2) passing through points A and B'.

10. The flow channel assembly according to claim 8, characterized in that: If a coordinate system is established with point A as the center and the outflow direction of the flow channel as the x-axis direction of the coordinate system; The tangent slope of each point of the inflow cross-section line AB' of the guide fence (2) is greater than or equal to the tangent slope of each point corresponding to the same y value of the core velocity trajectory line AB.

11. The flow channel assembly according to claim 8, characterized in that: The minimum distance between the connection position B' between the guide fence (2) and the lower wall of the flow channel and the flow channel outlet (121) is greater than or equal to a second preset value; The lower wall surface (12b) of the flow channel is constructed as an upwardly inclined section from the side away from the flow channel outlet (121) to the side close to the flow channel outlet (121), and the upward inclination angle β of the inclined section is between {1°-10°}.

12. The flow channel assembly according to claim 7, wherein: The grating (21) is fixedly arranged in the flow channel (1) or the position of the grating (21) is adjustable in the flow channel (1); wherein When the grating (21) is fixedly arranged in the flow channel (1), the grating (21) is in an upwardly inclined state from the side away from the flow channel outlet (121) to the side close to the flow channel outlet (121), and the upward inclination angle K of the grating (21) is between {0° and 10°}; When the grating (21) is adjustably arranged in the flow channel (1), the flow channel assembly further comprises a driving mechanism that is in transmission cooperation with the grating (21), and the driving mechanism is used to drive the grating (21) to rotate so as to adjust the flow diversion direction of the grating (21).

13. An air conditioner, characterized in that: The flow channel assembly comprises the flow channel assembly according to any one of claims 8 to 12.

14. The air conditioner according to claim 13, wherein: The air conditioner is a cabinet-type air conditioner, and the flow channel component is arranged at the bottom of the air conditioner; The flow channel outlet (121) in the flow channel assembly serves as the bottom air outlet on the front panel side of the air conditioner.

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