Air duct structure of air conditioner indoor unit and air conditioner indoor unit

Abstract

The utility model discloses an air conditioner indoor unit air duct structure, which is characterized in that a plurality of flow guide ribs which are arranged at intervals along the length direction of a volute tongue body are convexly arranged on the windward side of the volute tongue body in the air conditioner indoor unit air duct structure, and the extension direction of each flow guide rib is vertical to the length direction of the volute tongue body; a diversion trench is formed in an interval space between every two adjacent diversion ribs; and the top heights of the flow guide ribs are sequentially changed, so that the top connecting line track of the flow guide ribs is a periodic volt curve. According to the volute tongue, the distance between the flow guide ribs and the fan is in a changing state by utilizing the height change of the flow guide ribs, so that the impact of airflow on the volute tongue body is dispersed by utilizing the time difference of the airflow received by different flow guide ribs, the periodic excitation of rotating airflow on the volute tongue body is disturbed, and the frequency superposition is weakened; according to the invention, howling sound caused by airflow impact can be effectively weakened, a good noise reduction effect is achieved, and better use experience is brought to a user.

Description

Technical Field

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

[0002] The air duct structure of the indoor unit of the air conditioner includes the air inlet grille, evaporator, fan, feather, swing blade, volute and volute tongue. When the fan rotates, the airflow caused by the blades will hit the volute tongue. At this time, part of the airflow will flow along the wind-guiding 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. When the airflow hits the volute tongue, a sharp whistling sound will be caused, and the windward surface of the volute tongue will be superimposed with frequency due to the periodic excitation of the airflow, forming a more serious rotating whistling sound, which not only reduces the user experience due to the noise, but also disturbs the fan's airflow due to the turbulence of the return airflow, resulting in a decrease in the air volume and a reduction in the air outlet efficiency of the air duct.

[0003] 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.

[0004] The technical solution disclosed in the above patent application can only avoid the backflow of airflow by improving the uniformity of airflow discharge, but cannot solve the noise problem caused by the periodic excitation of the volute tongue body by the impact of airflow. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide an air duct structure of an indoor unit of an air conditioner which has good noise reduction effect and can improve the air outlet effect.

[0006] In order to solve the above technical problems, the technical solution adopted by the utility model is: an air duct structure of an indoor unit of an air conditioner, including a fan composed of multiple sections of cross-flow fans coaxially connected, a volute tongue body is arranged in a direction parallel to the axial direction of the cross-flow fan, a windward surface and a wind guide surface are provided on the volute tongue body, the windward surface is close to the cross-flow fan, 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, 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 top height of the guide ribs changes successively so that the top connection line trajectory of the guide ribs presents a curve with periodic rise and fall.

[0007] As an improvement of the above scheme: the top connection line trajectory of the guide rib is a sine-cosine function curve, and the trough of the sine-cosine function curve corresponding to the top connection line of the guide rib is tangent to the windward surface; the sine-cosine function curve corresponding to the top connection line of the guide rib includes at least two waveform periods.

[0008] As an improvement of the above scheme: the trajectory of the connection line of one end of the guide rib close to the outer edge of the windward surface is a sine-cosine function curve, and the sine-cosine function curve corresponding to the connection line of the guide rib end is in a corresponding relationship with the sine-cosine function curve corresponding to the connection line of the guide rib top.

[0009] As an improvement of the above scheme: the bottom connection line trajectory of the guide groove is a sine-cosine function curve, and the sine-cosine function curve corresponding to the bottom connection line of the guide groove is in an opposite relationship with the sine-cosine function curve corresponding to the top connection line of the guide rib.

[0010] As an improvement of the above solution: the wavelength of the sine-cosine function curve corresponding to the top connection line of the guide ribs is n times the section length of the crossflow fan, and n is an integer ≥1.

[0011] As an improvement of the above scheme: the thickness of the guide rib is 2-3 mm, the width of the guide groove is 1.8-2.5 mm; the minimum depth of the guide groove is 0 mm, and the maximum depth of the guide groove is 3-5 mm; the minimum distance between the top of the guide rib and the fan is 5-6 mm, and the maximum distance between the top of the guide rib and the fan is 8-11 mm.

[0012] As an improvement to the above solution: the peak of the sine-cosine function curve corresponding to the top connection line of the guide ribs is directly opposite to the connection point of each section of the cross-flow fan.

[0013] 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.

[0014] 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.

[0015] The utility model also discloses an air-conditioning indoor unit comprising the air-conditioning indoor unit air duct structure.

[0016] 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 guide ribs cooperate with the guide grooves to play a good guiding role on the airflow blown out by the fan, so that the airflow flows stably to the air outlet, and the pressure distribution of the airflow is 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 uses the height change of the guide ribs to make the distance between the guide ribs and the fan in a changing state. When the airflow blown out by the fan flows to the guide ribs of the volute tongue body, the guide ribs with a smaller distance from the fan are first impacted by the airflow, and the guide ribs with a larger distance from the fan are impacted by the airflow later, so that the time difference between different guide ribs receiving the airflow is used to disperse the impact of the airflow on the volute tongue body, disrupt the periodic excitation of the rotating airflow on the volute tongue body, and weaken the frequency superposition, which can effectively weaken the whistling sound caused by the impact of the airflow, play a good noise reduction effect, and bring a better use experience to users. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a side sectional view of the wind channel structure in the utility model;

[0018] Figure 2 It is an axonometric view of the snail tongue body in the utility model;

[0019] Figure 3 It is a partial enlarged schematic diagram of the snail tongue body;

[0020] Figure 4 It is a schematic diagram of the cooperation between the volute tongue body and the fan when the first implementation structure is adopted;

[0021] Figure 5 It is a schematic diagram of the cooperation between the volute tongue body and the fan when the second implementation structure is adopted.

[0022] Markings in the figure are: 100-cross-flow fan, 200-volute tongue body, 210-windward surface, 220-wind guide surface, 300-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 Figures 1 to 3 As shown, the air duct structure of the indoor unit of the air conditioner disclosed in the utility model includes a fan and a volute body 200, wherein the fan is composed of a multi-section cross-flow fan 100, and the multi-section cross-flow 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 indoor unit of the air conditioner, 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 direction of the fan and is close to the fan, and the wind guiding surface 220 is close to the air outlet direction.

[0026] Specifically, in order to solve the problem of noise caused by periodic excitation caused by the airflow blown by the fan impacting the volute tongue body 200, the utility model provides a raised guide rib 300 on the volute tongue body 200, and optimizes the structure and setting method of the guide rib 300. Figure 2 and Figure 3 As shown, 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 setting the guide ribs 300 on the windward surface 210 and cooperating with the guide grooves 400 formed between the 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. On the one hand, it can promote the airflow to flow in the direction of the air inlet to avoid the airflow from flowing back to the fan, and on the other hand, it can break up the airflow to reduce the impact of the airflow on the volute tongue body 200.

[0027] In addition, the utility model optimizes the structure and arrangement of the guide ribs 300 on the basis of setting the guide ribs 300 to achieve a better noise reduction effect. Figure 2 and Figure 3 As shown, the guide ribs 300 in the present invention have different height dimensions. In the present invention, the surface of the volute tongue body 200 is used as a reference plane for the height dimension of the guide ribs 300. The top height dimension of the guide ribs 300 changes sequentially, so that the top connection line trajectory of the guide ribs 300, that is, the top contour of the guide ribs 300, presents an undulating curve, as shown in FIG. Figure 4 and Figure 5 As shown, the spacing between different guide ribs 300 and the fan is inconsistent, and the peak of the sine-cosine function curve corresponding to the top connection line of the guide rib 300 is directly opposite to the connection point of each cross-flow fan 100 as a preferred implementation scheme. After the guide ribs 300 arranged in the above manner are adopted, the airflow blown out by the fan flows to different guide ribs 300 at different paths of different lengths, so the guide ribs 300 with a higher height, that is, the guide ribs 300 with a smaller distance from the fan, will be impacted by the airflow first, and the guide ribs 300 with a lower height, that is, the guide ribs 300 with a larger distance from the fan, will be impacted by the airflow later, so that the time for the airflow to flow to different guide ribs 300 on the volute tongue body 200 is different. The time difference of the impact can disperse the impact of the airflow on the volute tongue body 200, and can disrupt the periodic excitation of the rotating airflow on the volute tongue body 200 while reducing the impact intensity of the airflow, and avoid the superposition effect, thereby effectively reducing the noise intensity caused, and achieving a good noise reduction effect. Furthermore, since there is a difference in the distance between the guide rib 300 and the fan in the utility model, the air volume loss can be compensated by each other, thereby ensuring the air volume of the air outlet and effectively improving the air outlet efficiency.

[0028] On the basis of the above structure, the utility model further limits the height dimension of the guide rib 300, so that the height dimension of the guide rib 300 changes regularly, such as Figure 5 As shown, the top line trajectory of the guide rib 300, i.e., the top contour of the guide rib 300, is a sine-cosine function curve, which includes a sine function curve and a cosine function curve, and the curve shapes of the two are consistent; at the same time, the trough of the sine-cosine function curve corresponding to the top line of the guide rib 300 is tangent to the windward surface 210, i.e., the trough of the sine-cosine function curve is on the windward surface 210. After adopting the above structure, the distance between the top of the guide rib 300 and the fan changes regularly, which can further smooth the pressure distribution of the airflow, so that the impact force of the airflow on the volute tongue body 200 is regularly distributed in the length direction of the volute tongue body 200, which can be beneficial to the force balance of the volute tongue body 200 and better dispersion effect on the impact of the airflow. The sine-cosine function curve corresponding to the top line of the guide rib 300 includes at least two waveform periods, i.e., the sine-cosine function curve has at least two peaks and at least two troughs.

[0029] Furthermore, the utility model also limits the length dimension of the guide rib 300, so that the trajectory of the end connection line of the guide rib 300 close to the outer edge of the windward surface 210 is a sine-cosine function curve, and the sine-cosine function curve corresponding to the end connection line of the guide rib 300 is in a corresponding relationship with the sine-cosine function curve corresponding to the top connection line of the guide rib 300. Similarly, the present invention limits the depth dimension of the guide groove 400, so that the bottom connection line of the guide groove 400 is a sine-cosine function curve, and the sine-cosine function curve corresponding to the bottom connection line of the guide groove 400 is inversely related to the sine-cosine function curve corresponding to the top connection line of the guide rib 300, that is, the peak of the sine-cosine function curve corresponding to the guide groove 400 corresponds to the trough of the sine-cosine function curve corresponding to the top connection line of the guide rib 300, and the trough of the sine-cosine function curve corresponding to the guide groove 400 corresponds to the peak of the sine-cosine function curve corresponding to the top connection line of the guide rib 300. Because the distance between the guide rib 300 with a higher height and the fan is shorter, the airflow path is shorter and has a greater flow rate and energy, so the depth of the guide groove 400 here is strengthened, and the airflow is deeply cut to have a strong dispersion effect on the airflow. Through the above structural optimization, the overall specifications of the guide ribs 300 are changed periodically, which can enhance the drainage and diversion effects of the guide ribs 300 and the guide grooves 400.

[0030] In one embodiment of the utility model, the wavelength of the sine-cosine function curve corresponding to the top connection line of the guide rib 300 can be limited to n times the length of the cross-flow fan 100, and n is an integer ≥ 1, that is, the wavelength of the sine-cosine function curve corresponding to the top connection line of the guide rib 300 is at least one times the length of the cross-flow fan 100; and the wavelengths of each waveform period of the sine-cosine function curve can be set to the same wavelength or different wavelengths. According to actual experimental tests, the best noise reduction effect can be achieved within the following size range: the thickness of the guide rib 300 is 2 to 3 mm, and the width of the guide groove 400 is 1.8 to 2.5 mm; the lowest depth of the guide groove 400 is 0 mm, and the highest depth of the guide groove 400 is 3 to 5 mm; the minimum distance between the top of the guide rib 300 and the fan is 5 to 6 mm, and the maximum distance between the top of the guide rib 300 and the fan is 8 to 11 mm.

[0031] Further, such as Figure 2 and Figure 3As shown, 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. This enhances the airflow diversion effect, and the airflow can flow stably to the windward surface 220 through the diversion of the guide rib 300; and because the airflow discharge process needs to ensure the uniformity of the air discharge, 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 is consistent. Figure 2 and Figure 3 As shown, 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, and the radius of the arc section is in the optimal size range of 6 to 7 mm; and the air guide surface 220 is set as a plane, which can improve the stability of the airflow flowing along the air guide surface 220 and ensure the consistency of the air outlet direction.

[0032] The utility model also discloses an air conditioner indoor unit, in which the air conditioner indoor unit air duct structure described above is arranged.

Claims

1. An air duct structure for an indoor unit of an air conditioner, comprising a fan composed of a plurality of cross-flow fans (100) connected coaxially, a volute tongue body (200) being arranged in a direction parallel to the axial direction of the cross-flow 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 cross-flow 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 top heights of the guide ribs (300) are changed sequentially so that the top connection line trajectory of the guide ribs (300) presents a periodically undulating curve.

2. The air duct structure of the indoor unit of the air conditioner according to claim 1, characterized in that: The top connection line trajectory of the guide rib (300) is a sine-cosine function curve, and the trough of the sine-cosine function curve corresponding to the top connection line of the guide rib (300) is tangent to the windward surface (210); the sine-cosine function curve corresponding to the top connection line of the guide rib (300) includes at least two waveform cycles.

3. The air duct structure of the indoor unit of the air conditioner according to claim 2, characterized in that: The trajectory of the connection line of one end of the guide rib (300) close to the outer edge of the windward surface (210) is a sine-cosine function curve, and the sine-cosine function curve corresponding to the connection line of the end of the guide rib (300) is in a corresponding relationship with the sine-cosine function curve corresponding to the connection line of the top of the guide rib (300).

4. The air duct structure of the indoor unit of the air conditioner according to claim 2, characterized in that: The groove bottom connection line trajectory of the guide groove (400) is a sine-cosine function curve, and the sine-cosine function curve corresponding to the groove bottom connection line of the guide groove (400) is in an opposite relationship to the sine-cosine function curve corresponding to the top connection line of the guide rib (300).

5. The air duct structure of the indoor unit of the air conditioner according to any one of claims 2 to 4, characterized in that: The wavelength of the sine-cosine function curve corresponding to the top connection line of the guide rib (300) is n times the section length of the cross-flow fan (100), and n is an integer ≥1.

6. The air duct structure of the indoor unit of the air conditioner according to claim 5, characterized in that: The thickness of the guide rib (300) is 2 to 3 mm, and the width of the guide groove (400) is 1.8 to 2.5 mm; the lowest depth of the guide groove (400) is 0 mm, and the highest depth of the guide groove (400) is 3 to 5 mm; the minimum distance between the top of the guide rib (300) and the fan is 5 to 6 mm, and the maximum distance between the top of the guide rib (300) and the fan is 8 to 11 mm.

7. The air duct structure of the indoor unit of the air conditioner according to claim 2, characterized in that: The wave crest of the sine-cosine function curve corresponding to the top connection line of the guide rib (300) is directly opposite to the connection point of each section of the cross-flow fan (100).

8. The air duct structure of the indoor unit of the air conditioner 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.

9. The air duct structure of the indoor unit of the air conditioner according to claim 8, 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).

10. An air conditioner indoor unit, characterized in that: It comprises the air duct structure of an indoor unit of an air conditioner as described in any one of claims 1 to 9.

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