Cross-flow air duct volute tongue structure and air conditioner indoor unit

Abstract

The utility model discloses a cross-flow air duct volute tongue structure and an air conditioner indoor unit, the windward side of a volute tongue body is convexly provided with a plurality of flow guide ribs which are arranged at intervals along the length direction of the volute tongue body, the extension direction of each flow guide rib is vertical to the length direction of the volute tongue body, and the interval space between the adjacent flow guide ribs forms a flow guide groove; the flow guide ribs corresponding to the connecting positions of the ends of the cross-flow fans are end flow guide ribs, the flow guide ribs corresponding to the blades of the cross-flow fans are blade flow guide ribs, and the top height of the end flow guide ribs is larger than that of the blade flow guide ribs. According to the utility model, the height size of the end part flow guide ribs is set to be greater than that of the blade flow guide ribs, so that the balance of the flow speed of airflow at different positions in the air duct is realized, the air pressure difference in the air duct is effectively avoided, the generation of airflow vortex is prevented, the airflow flowing disorder is avoided, and a good noise reduction effect is achieved; and better use experience is brought to the user.

Description

Technical Field

[0001] The utility model relates to the technical field of air-conditioning equipment, in particular to a cross-flow air duct volute tongue structure and an air-conditioning indoor unit. Background Art

[0002] The air duct structure of the air conditioner indoor unit includes an air inlet grille, evaporator, fan, feathers, swing blades, volute and volute tongue. When the fan rotates, the induced airflow hits the volute tongue driven by the blades. At this time, part of the airflow will flow along the wind guide surface of the volute tongue and blow out from the air outlet, while the other part of the airflow will flow along the windward surface of the volute tongue and return to the inside of the air duct.

[0003] In the air duct of the existing air conditioner indoor unit, the distance between the cross-flow fan and the volute body remains unchanged. When the fan is running at high speed, the fan blades cut the airflow and generate high-speed airflow in the return air duct opposite to the blades; and the connecting hubs of each cross-flow fan and the ends of the fan at both ends are not in the air cutting range of the blades and cannot cut the airflow, so the airflow velocity in this section is low, which easily leads to different wind pressures inside the air duct, and finally generates high-frequency whistling sound due to the airflow vortex. In addition, the high-speed airflow generated by the blade cutting the airflow and the low-speed airflow where the airflow cannot be cut will have flow turbulence at the junction, which is easy to produce abnormal noise, further aggravating the working noise of the air conditioner indoor unit and seriously affecting the user experience.

[0004] The Chinese invention application with publication number CN107576041A discloses an air conditioner volute, an air conditioner indoor unit and an air conditioner. The air conditioner volute includes a volute body, a wind guide surface is provided on the volute body, a plurality of guide ribs are provided on the wind guide surface and are spaced apart along the length direction of the volute body, and a guide groove is formed between any two adjacent guide ribs; the guide groove is a spiral groove or an inclined groove. The air conditioner indoor unit includes the above-mentioned air conditioner volute. The air conditioner includes the above-mentioned air conditioner indoor unit. Through the guide groove with a spiral or inclined structure, on the one hand, the boundary of the air flow entering the guide groove can be closely attached to the surface of the guide rib, reducing the mixing with the surrounding air flow, avoiding large energy fluctuations, and reducing noise; on the other hand, the air flow is discharged along the guide groove, ensuring the uniformity of the exhaust air flow, and at the same time avoiding gas backflow.

[0005] The technical solution disclosed in the above patent application can only avoid the backflow of airflow by improving the uniformity of airflow discharge. Therefore, it can only solve the noise caused by the backflow of airflow, but cannot solve the noise problem caused by the different airflow velocities in the air duct corresponding to the blade position and the end position of the cross-flow fan. Utility Model Content

[0006] The technical problem to be solved by the utility model is to provide a crossflow air duct volute tongue with good noise reduction effect.

[0007] In order to solve the above technical problems, the technical solution adopted by the utility model is: a crossflow duct volute tongue structure, including a fan composed of multiple crossflow fans coaxially connected, a volute tongue body is arranged in a direction parallel to the axial direction of the crossflow fan, and a windward surface and a wind guide surface are provided on the volute tongue body. The windward surface is close to the crossflow fan, and a plurality of guide ribs arranged at intervals along the length direction of the volute tongue body are protruded on the windward surface of the volute tongue body, and the extension direction of each guide rib is perpendicular to the length direction of the volute tongue body, and the interval space between adjacent guide ribs forms a guide groove; the guide ribs corresponding to the connection between the ends of each crossflow fan are end guide ribs, and the guide ribs corresponding to the blades of each crossflow fan are blade guide ribs, and the top height of the end guide ribs is greater than the top height of the blade guide ribs.

[0008] As an improvement of the above scheme: the top height of the guide rib changes in a trapezoidal function and / or a rectangular function in the length direction of the snail tongue body, the top height of the end guide rib is the highest point of the trapezoidal function and / or the rectangular function, and the top height of the blade guide rib is the lowest point of the trapezoidal function and / or the rectangular function.

[0009] As an improvement of the above scheme: the width of the end guide rib is greater than the width of the blade guide rib; the widths of each end guide rib are the same or different, and the widths of each blade guide rib are the same or different; the heights of the blade guide ribs corresponding to different cross-flow fans are the same or different.

[0010] As an improvement of the above solution: the thickness of the end guide rib is 10-15 mm, the width of the blade guide rib is 2-3 mm; the width of the guide groove is 1.8-2.5 mm.

[0011] As an improvement of the above scheme: the guide ribs extend from the windward surface of the snail tongue body to the wind guiding surface, the transition section of the guide ribs between the windward surface and the wind guiding surface is an arc section, and the ends of each guide rib at one end of the wind guiding surface are flush.

[0012] As an improvement of the above solution: the windward surface on the volute tongue body is an inclined surface, the wind-guiding surface on the volute tongue body is a plane, and there is an arc transition between the windward surface and the wind-guiding surface.

[0013] The utility model also discloses an indoor unit of an air conditioner comprising the crossflow air duct volute tongue structure.

[0014] The beneficial effects of the utility model are as follows: the utility model arranges guide ribs on the volute tongue body of the air duct structure, and arranges the guide ribs at intervals along the length direction of the volute tongue body to form guide grooves. The cooperation of the guide ribs and the guide grooves can play a good guiding role on the airflow blown out by the fan, so that the airflow can flow stably to the air outlet, and the pressure distribution of the airflow can be balanced, thereby reducing the disturbance of the return airflow to the fan and improving the air outlet effect; at the same time, the utility model limits the structure and arrangement of the guide ribs, and aims at the noise problem caused by the different air flow velocities in the air duct corresponding to the end connection of the cross-flow fan and the blade position. The height dimension of the end guide rib corresponding to the end connection of the cross-flow fan is set to be greater than that of the cross-flow fan The height of the blade guide ribs corresponding to the blades of the fan makes the distance between the guide ribs near the end connection of the cross-flow fan and the fan smaller than the distance between the guide ribs near the blades of the cross-flow fan and the fan. The flow path of the airflow is increased by increasing the distance between the blade guide ribs and the blades, so that the flow velocity of the airflow at this location is slowed down. The flow path of the airflow is shortened by reducing the distance between the end guide rib and the end of the cross-flow fan, so that the flow velocity of the airflow at this location is accelerated, thereby achieving a balance of the airflow velocity at different positions in the air duct, effectively avoiding the generation of air pressure differences in the air duct, and at the same time preventing the generation of air flow vortices, avoiding air flow turbulence, achieving a good noise reduction effect, and bringing users a better user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a side sectional view of the wind channel structure in the utility model;

[0016] Figure 2 It is a schematic diagram of the cooperation between the volute tongue body and the fan when the first implementation structure is adopted;

[0017] Figure 3 It is a schematic diagram of the cooperation between the volute tongue body and the fan when the second implementation structure is adopted;

[0018] Figure 4 It is a schematic diagram of the cooperation between the volute tongue body and the fan when the third implementation structure is adopted;

[0019] Figure 5 It is a schematic diagram of the cooperation between the volute tongue body and the fan when the fourth implementation structure is adopted;

[0020] Figure 6 It is a schematic diagram of the cooperation between the volute tongue body and the fan when the fifth implementation structure is adopted;

[0021] Figure 7 It is a schematic diagram of the cooperation between the volute tongue body and the fan when the sixth implementation structure is adopted.

[0022] Markings in the figure are: 100-crossflow fan, 110-crossflow fan end, 120-crossflow fan blade, 200-volute tongue body, 210-windward surface, 220-wind guide surface, 300-guide rib, 310-end guide rib, 320-blade guide rib, 400-guide groove. DETAILED DESCRIPTION

[0023] In order to facilitate the understanding of the present invention, the present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0024] In the description of the present invention, it should be noted that the directions or positional relationships indicated by terms such as "front", "rear", "left", "right", "up", "down", and "inside" are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of description. They do not indicate or imply that the device or component referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0025] like Figure 1 As shown, the crossflow air duct volute structure disclosed in the utility model includes a fan and a volute body 200, wherein the fan is composed of a multi-section crossflow fan 100, and the multi-section crossflow fans 100 are coaxially connected in sequence to form a fan, and the volute body 200 is arranged between the fan and the air outlet of the air-conditioning indoor unit, and the length direction of the volute body 200 is parallel to the axial direction of the fan; a windward surface 210 and a wind guiding surface 220 are arranged on the volute body 200, the windward surface 210 faces the fan direction and is close to the fan, and the wind guiding surface 220 is close to the air outlet direction.

[0026] like Figures 1 to 3 As shown, in order to solve the noise problem in the air duct, the utility model is provided with a raised guide rib 300 on the volute tongue body 200, and the structure and arrangement of the guide rib 300 are optimized. There are multiple guide ribs 300, and the guide ribs 300 are arranged on the windward surface 210 of the volute tongue body 200. The multiple guide ribs 300 are arranged in sequence along the length direction of the volute tongue body 200, and the extension direction of the guide ribs 300 is perpendicular to the length direction of the volute tongue body 200. The interval space between adjacent guide ribs 300 serves as a guide groove 400. By providing the guide ribs 300 on the windward surface 210 and cooperating with the guide grooves 400 formed between the adjacent guide ribs 300, the utility model can play a role in guiding and diverting the airflow blown by the fan to the windward surface 210 of the volute tongue body 200, and can promote the airflow to flow in the direction of the air inlet to avoid the airflow backflowing to the fan, thereby reducing the noise problem caused by the disturbance of the airflow backflow.

[0027] Since the fan is composed of individual crossflow fans 100 connected in sequence in the axial direction, the crossflow fan ends 110 located at both ends of each crossflow fan 100 serve as the connection point of adjacent crossflow fan blades 120. Since the connection point is not within the direct rotation range of the crossflow fan blades 120, the airflow volume and airflow velocity at this point are relatively small. In addition, the airflow cannot be cut by the crossflow fan blades 120, which further leads to a reduction in the airflow velocity. The crossflow fan blades 120 located in the middle of each crossflow fan 100 can directly cut the airflow through their own high-speed rotation, so that the airflow velocity at the corresponding air duct position is increased. This results in a large difference in the airflow velocity at the air duct position corresponding to the crossflow fan ends 110 and the crossflow fan blades 120, which will not only cause different wind pressures in the air duct, but also cause airflow turbulence, thereby generating noise and abnormal sounds.

[0028] In order to solve the above problems, the present invention optimizes the structure and arrangement of the guide ribs 300 on the basis of setting the guide ribs 300. Figures 2 to 7 As shown, the utility model sets the guide rib 300 corresponding to the cross-flow fan end 110 of each cross-flow fan 100 as the end guide rib 310, sets the guide rib 300 corresponding to the cross-flow fan blade 120 of each cross-flow fan 100 as the blade guide rib 320, and at the same time limits the top height of the end guide rib 310 to be greater than the top height of the blade guide rib 320, that is, shortens the distance between the end guide rib 310 and the fan and increases the distance between the blade guide rib 320 and the fan, so that the distance between the end guide rib 310 and the fan is greater than the distance between the blade guide rib 320 and the fan. Through the above structural optimization, the utility model increases the path of the airflow from the cross-flow fan blade 120 to the blade guide rib 320, and the longer the flow path, the more obvious the effect of slowing down the airflow velocity; while the path of the airflow from the cross-flow fan end 110 to the end guide rib 310 is shortened, and the shorter the flow path, the worse the effect of slowing down the airflow velocity. Therefore, the speed difference between the airflow at the end 110 of the crossflow fan and the airflow at the crossflow fan blades 120 can be effectively reduced, the wind pressure inside the air duct can be balanced as much as possible, and at the same time, the formation of flow turbulence is avoided, the noise and abnormal sound generated are eliminated, and a good noise reduction effect is achieved.

[0029] Further, such as Figures 2 to 7As shown, the top height of the guide rib 300 in the utility model changes in a trapezoidal function or a rectangular function in the length direction of the volute tongue body 200, and can also change in a trapezoidal function and a rectangular function at the same time; the trapezoidal function change or rectangular function change mentioned here means that by limiting the top height size of the guide rib 300, the contour shape of all the guide ribs 300 forms a trapezoidal function image or a rectangular function image in the length direction of the volute tongue body 200. The top height of the end guide rib 310 is the highest point of the corresponding function image, and the top height of the blade guide rib 320 is the lowest point of the corresponding function image. The top height of the guide rib 300 can present a periodic function change, or a non-periodic function change. When presenting a non-periodic function change, it can destroy the airflow resonance, thereby improving the effect of eliminating the whistling sound.

[0030] Furthermore, the present invention defines that the width of the end guide rib 310 is greater than the width of the blade guide rib 320; the widths of the end guide ribs 310 are the same or different, and the widths of the blade guide ribs 320 are the same or different; and the heights of the blade guide ribs 320 corresponding to different cross-flow fans 100 are the same or different. According to the above definition, the following different embodiments can be embodied.

[0031] like Figure 4 In the illustrated embodiment, the top height of the guide rib 300 varies in a rectangular function, the width of each end guide rib 310 is the same, and the width of the end guide rib 310 is greater than the width of the blade guide rib 320, and the width of each blade guide rib 320 is the same.

[0032] like Figure 5 In the illustrated embodiment, the top height of the guide rib 300 varies in a trapezoidal function, the widths of the end guide ribs 310 are different, and there are end guide ribs 310 whose widths are equal to the widths of the blade guide ribs 320 and end guide ribs 310 whose widths are greater than the widths of the blade guide ribs 320. The heights of the blade guide ribs 320 are different but the widths are the same.

[0033] like Figure 6 In the illustrated embodiment, the top height of the guide rib 300 varies in a rectangular function, the width of each end guide rib 310 is the same, and the width of the end guide rib 310 is greater than the width of the blade guide rib 320, and the height of each blade guide rib 320 is the same but the width is different.

[0034] like Figure 7In the illustrated embodiment, the top height of the guide rib 300 varies in a rectangular function, the widths of the end guide ribs 310 are the same, and the width of the end guide ribs 310 is greater than the width of the blade guide ribs 320, the widths of the blade guide ribs 320 are different, and there are height differences between the blade guide ribs 320 corresponding to different cross-flow fan blades 120.

[0035] According to actual experimental tests, the best noise reduction effect can be achieved within the following size range: the width of the end guide rib 310 is 10-15 mm, the width of the blade guide rib 320 is 2-3 mm, and the width of the guide groove 400 is 1.8-2.5 mm.

[0036] Furthermore, the utility model increases the length of the guide rib 300, so that the guide rib 300 extends from the windward surface 210 on the volute tongue body 200 to the windward surface 220, and sets the transition section of the guide rib 300 between the windward surface 210 and the windward surface 220 as an arc section. Thus, the airflow guiding effect is enhanced, and the airflow can stably flow to the windward surface 220 through the guidance of the guide rib 300; and since the airflow discharge process needs to ensure the uniformity of the airflow, the utility model stipulates that the ends of each guide rib 300 at one end of the windward surface 220 are flush, so that the airflow left from each guide groove 400 remains consistent.

[0037] Furthermore, the utility model sets the windward surface 210 on the volute tongue body 200 as an inclined surface, and sets the wind guide surface 220 on the volute tongue body 200 as a plane, and at the same time makes the arc transition between the windward surface 210 and the wind guide surface 220, which can enhance the guiding effect of the windward surface 210 on the airflow, and promote the airflow to flow in the direction of the guide groove 400 on the air guide surface 210; and the transition section between the windward surface 210 and the air guide surface 220 is set as an arc section, which can improve the smoothness of the airflow in this transition section and improve the air outlet effect. The radius of the arc section is in the optimal size range of 6 to 7 mm; setting the air guide surface 220 as a plane can improve the stability of the airflow flowing along the air guide surface 220 and ensure the consistency of the air outlet direction.

[0038] The utility model also discloses an indoor unit of an air conditioner, in which the volute tongue structure of the cross-flow air duct described above is arranged.

Claims

1. A crossflow air duct volute tongue structure, comprising a fan composed of a plurality of crossflow fans (100) connected coaxially, a volute tongue body (200) being arranged in a direction parallel to the axial direction of the crossflow fan (100), a windward surface (210) and a wind guide surface (220) being arranged on the volute tongue body (200), the windward surface (210) being close to the crossflow fan (100), and characterized in that: A plurality of guide ribs (300) are protruded on the windward surface (210) of the volute tongue body (200) and are arranged at intervals along the length direction of the volute tongue body (200); the extension direction of each guide rib (300) is perpendicular to the length direction of the volute tongue body (200); and the interval space between adjacent guide ribs (300) forms a guide groove (400); the guide rib (300) corresponding to the connection portion of the end of each cross-flow fan (100) is an end guide rib (310); the guide rib (300) corresponding to the blade of each cross-flow fan (100) is a blade guide rib (320); and the top height of the end guide rib (310) is greater than the top height of the blade guide rib (320).

2. The crossflow air duct volute tongue structure according to claim 1, characterized in that: The top height of the guide rib (300) varies in a trapezoidal function and / or a rectangular function in the length direction of the volute tongue body (200), the top height of the end guide rib (310) is the highest point of the trapezoidal function and / or the rectangular function, and the top height of the blade guide rib (320) is the lowest point of the trapezoidal function and / or the rectangular function.

3. The crossflow air duct volute tongue structure according to claim 2, characterized in that: The width of the end guide rib (310) is greater than the width of the blade guide rib (320); the widths of the end guide ribs (310) are the same or different, and the widths of the blade guide ribs (320) are the same or different; and the heights of the blade guide ribs (320) corresponding to different cross-flow fans (100) are the same or different.

4. The crossflow air duct volute tongue structure according to claim 2, characterized in that: The width of the end guide rib (310) is 10 to 15 mm, the width of the blade guide rib (320) is 2 to 3 mm; and the width of the guide groove (400) is 1.8 to 2.5 mm.

5. The crossflow air duct volute tongue structure according to claim 1, characterized in that: The guide ribs (300) extend from the windward surface (210) on the volute tongue body (200) to the wind guiding surface (220); the transition section of the guide ribs (300) between the windward surface (210) and the wind guiding surface (220) is an arc section; the ends of the guide ribs (300) at one end of the wind guiding surface (220) are flush with each other.

6. The crossflow air duct volute tongue structure according to claim 5, characterized in that: The windward surface (210) on the volute tongue body (200) is an inclined surface, the wind-guiding surface (220) on the volute tongue body (200) is a plane, and there is an arc transition between the windward surface (210) and the wind-guiding surface (220).

7. An air conditioner indoor unit, characterized in that: It comprises the cross-flow air duct volute tongue structure as described in any one of claims 1 to 6.

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