Noise reduction air duct structure of air conditioner indoor unit and air conditioner indoor unit

Abstract

The utility model discloses an air conditioner indoor unit noise reduction air duct structure and an air conditioner indoor unit, the two ends of a fan are a motor connecting end and a bearing connecting end respectively, and a plurality of flow guide ribs which are distributed at intervals in the length direction of a volute tongue body are arranged on the windward side of the volute tongue body in the air conditioner indoor unit noise reduction air duct structure in a protruding mode. The extending direction of each flow guide rib is perpendicular to the length direction of the volute tongue body, and a flow guide groove is formed in the interval space between every two adjacent flow guide ribs. The top height of the flow guide rib close to the motor connecting end is larger than that of the flow guide rib close to the bearing connecting end. By means of the height difference of the flow guide ribs located at different positions of the volute tongue body, air pressure difference caused by linear velocity difference of cross-flow fans at the two ends can be compensated, air pressure in an air channel is balanced, airflow vortex is avoided, noise caused by the air pressure difference is effectively weakened, the good noise reduction effect is achieved, and the service life of the volute tongue is prolonged. 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 noise reduction air duct structure of an air-conditioning indoor unit and an air-conditioning indoor unit. 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 impacts 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 fan is running at high speed, the recirculation zone will produce a high-frequency whistling sound due to the high airflow velocity, resulting in noise; and because the movement of the multi-section cross-flow fan that constitutes the fan is unbalanced, under the premise of the same angular velocity, the linear velocity of the cross-flow fan near the bearing end will be higher than the linear velocity of the cross-flow fan near the motor end. Due to the difference in the linear velocity of the cross-flow fan, the wind speed of each part of the air duct will be different, which will lead to different wind pressures in the air duct, and finally cause airflow vortexes, deepen the frequency of the whistling sound, aggravate the generation of noise, and seriously affect the user experience.

[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, and therefore can only solve the noise caused by the backflow of airflow, but cannot solve the noise problem caused by different wind pressures in the air duct. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a noise reduction air duct structure of an indoor unit of an air conditioner with good noise reduction effect.

[0006] In order to solve the above technical problems, the technical solution adopted by the utility model is: a noise reduction air duct structure of an air conditioner indoor unit, including a fan composed of multiple cross-flow fans coaxially connected, a volute tongue body is arranged in a direction parallel to the axial direction of the cross-flow fan, and a windward surface and a wind guide surface are arranged on the volute tongue body. The windward surface is close to the cross-flow fan, and the two ends of the fan are respectively a motor connection end and a bearing connection end. 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 top height of the guide rib close to the motor connection end is greater than the top height of the guide rib close to the bearing connection end.

[0007] As an improvement of the above scheme: one third of the length of the volute tongue body is used as the partition boundary, the partition at the end of the volute tongue body close to the motor connection end is the first partition, the partition at the end of the volute tongue body close to the bearing connection end is the second partition, and the partition located in the middle of the volute tongue body is the middle partition; the top height of the guide rib located in the first partition is greater than the top height of the guide rib located in the second partition.

[0008] As an improvement of the above solution: the top height of the guide rib located in the middle part of the volute tongue body is greater than the top height of the guide rib located in the first partition and the second partition.

[0009] As an improvement of the above solution: the top height of the guide rib located in the middle part of the volute tongue body is smaller than the top height of the guide rib located in the first partition and the second partition.

[0010] As an improvement of the above scheme: the thickness of the guide rib is 2-3 mm, the width of the guide groove is 2-3 mm; the top height of the guide rib in the first partition is 6-7 mm, and the top height of the guide rib in the second partition is 4-5 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 air-conditioning indoor unit comprising the air-conditioning indoor unit noise reduction air duct 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 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 utilizes the height difference of the guide ribs at different positions on the volute tongue body, so that the height of the guide ribs close to one end of the motor is greater than the height of the guide ribs close to one end of the bearing, so that the distance between the guide ribs close to one end of the motor and the fan is smaller than the distance between the guide ribs close to one end of the bearing and the fan, which can compensate for the wind pressure difference caused by the difference in linear speed of the cross-flow fans at both ends, balance the wind pressure inside the air duct, avoid the generation of airflow vortex, effectively reduce the noise caused by the wind pressure difference, play a good noise reduction effect, and bring a better use experience to users. 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] Markings in the figure are: 100-cross-flow fan, 110-motor connection end, 120-bearing connection end, 200-volute tongue body, 210-windward surface, 220-wind guide surface, 300-guide ribs, 400-guide grooves. DETAILED DESCRIPTION

[0020] 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.

[0021] 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.

[0022] like Figures 1 to 4As shown, the noise reduction air duct structure of the indoor unit of the air conditioner disclosed in the utility model includes a fan and a volute tongue 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 tongue 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 tongue body 200 is parallel to the axial direction of the fan; a windward surface 210 and a wind guide surface 220 are arranged on the volute tongue body 200, and the windward surface 210 faces the direction of the fan and is close to the fan, and the wind guide surface 220 is close to the direction of the air outlet. The two ends of the fan are connected to the motor and the bearing respectively, so the end of the fan connected to the motor is the motor connection end 110, and the end of the fan connected to the bearing is the bearing connection end 120.

[0023] Specifically, in order to solve the noise problem in the air duct, the utility model sets a raised guide rib 300 on the volute tongue body 200, and optimizes the structure and arrangement of the guide rib 300. Figures 2 to 4 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 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 from flowing back to the fan, thereby reducing the noise problem caused by the disturbance of the airflow backflow.

[0024] More importantly, in order to solve the noise problem caused by the difference in linear speed of the cross-flow fan 100 in different segments, the present invention optimizes the structure and arrangement of the guide ribs 300 on the basis of setting the guide ribs 300. Figure 2As shown, according to the distribution difference of the linear velocity of the crossflow fan 100, the utility model sets the top height of the guide rib 300 near the motor connection end 110 to be greater than the top height of the guide rib 300 near the bearing connection end 120; in the utility model, the surface of the volute tongue body 200 is used as the reference datum plane for the height dimension of the guide rib 300. Because during the rotation of the fan, the linear velocity of the crossflow fan near the motor connection end 110 is lower than the linear velocity of the crossflow fan near the bearing connection end 120, the corresponding wind pressure is different, which leads to a wind pressure difference inside the air duct. In the utility model, the top height of the guide rib 300 near the motor connection end 110 is increased, so that the distance between the guide rib 300 near the motor connection end 110 and the fan is shortened, and the flow path of the airflow from the throttling fan 100 to the guide rib 300 is shortened, the airflow is not easy to leak and diffuse, the air volume loss is small, and the low wind pressure can be reinforced; at the same time, the top height of the guide rib 300 near the bearing connection end 120 is reduced, so that the distance between the guide rib 300 near the bearing connection end 120 and the fan is increased, and the flow path of the airflow from the throttling fan 100 to the guide rib 300 is increased, the airflow is easy to leak and diffuse, the air volume loss is large, and the high wind pressure can be weakened. Through the above-mentioned structural improvement, the utility model effectively reduces the air pressure difference in the air duct, makes the air pressure difference in the air duct tend to be balanced, effectively reduces the noise caused by the difference in the induced air pressure, and has a good noise reduction effect.

[0025] In order to further improve the balancing effect on wind pressure, the utility model divides the height distribution range of the guide rib 300 more accurately, and takes one-third of the length of the volute tongue body 200 as the partition boundary, and divides the volute tongue body 200 into three partitions along the length direction of the volute tongue body 200. The partition at the end of the volute tongue body 200 close to the motor connection end 110 is divided into the first partition, the partition at the end of the volute tongue body 200 close to the bearing connection end 120 is divided into the second partition, and the partition located in the middle of the volute tongue body 200 is divided into the middle partition; the top height of the guide rib 300 located in the first partition is greater than the top height of the guide rib 300 located in the second partition.

[0026] In the present utility model Figure 3In the illustrated embodiment structure, the top height of the guide ribs located in the middle section is further limited, so that the top height of the guide ribs 300 located in the middle section of the volute tongue body 200 is greater than the top height of the guide ribs 300 located in the first section and the second section; then, on the basis of the height difference of the guide ribs 300 located in the first section and the second section, the height of the guide ribs 300 located in the middle section is further increased, so that all the guide ribs 300 on the volute tongue body 200 present a distribution trend of high in the middle and low at both ends. If the height of the guide ribs 300 located in the first section and the second section of the volute tongue body 200 is too high, it is easy to generate a low-speed vortex zone in the guide groove 400 in the two end sections, and the high flow of airflow on the convex surface of the guide ribs 300 will cause airflow turbulence, thereby generating abnormal noise; in this embodiment, the height distribution trend of the guide ribs 300 can reduce the depth of the guide groove 400 in the two end sections, avoid the generation of low-speed vortex zones, and thus solve the problem of discontinuous abnormal sounds at both ends of the volute tongue body 200.

[0027] In the utility model Figure 4 In another embodiment structure shown, the top height of the guide ribs located in the middle section is further limited, so that the top height of the guide ribs 300 located in the middle section of the volute tongue body 200 is less than the top height of the guide ribs 300 located in the first section and the second section; then, based on the height difference between the guide ribs 300 located in the first section and the second section, the height of the guide ribs 300 located in the middle section is further reduced, so that all the guide ribs 300 on the volute tongue body 200 show a distribution trend of being low in the middle and high at both ends. Due to the structural characteristics of the fan, when the fan is running at high speed, the air outlet at the middle section of the fan will not be affected by resistance, the air flow velocity is high, the air output volume is large, and the corresponding return air velocity and return air volume are also larger, resulting in high-frequency whistling sounds being more likely to be generated in the middle area of ​​the snail tongue body 200; the height distribution trend of the guide ribs 300 in this embodiment can increase the distance between the guide ribs 300 and the fan in the middle area, thereby slowing down the return air velocity of the airflow in this area, reducing the disturbance of the return air flow on the fan air output, and thus weakening the whistling sound that is easily generated in the middle area of ​​the snail tongue body 200. Also due to the structural characteristics of the fan, when the fan is running at a low speed, the presence of walls at both ends of the fan will cause the air flow velocity and air volume at the end faces of the fan to be small, and thus it is easy to form low-speed eddy current zones at the end faces of the fan, resulting in the generation of low-frequency sound in the air duct; the height distribution trend of the guide ribs 300 in this embodiment can reduce the air volume loss at the two end faces of the fan, thereby increasing the air volume and air flow velocity, eliminating the low-speed eddy current zones generated near the fan wall, and effectively improving the problem of low-frequency sound in the air duct caused by the generation of low-speed eddy current zones.

[0028] 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 2-3 mm, the width of the guide groove 400 is 2-3 mm; the top height of the guide rib 300 in the first partition is 6-7 mm, and the top height of the guide rib 300 in the second partition is 4-5 mm. Figure 3 In the embodiment shown, the top height of the guide rib 300 located in the middle area is greater than 7 mm. Figure 4 In the illustrated embodiment, the top height of the guide rib 300 located in the middle area is less than 4 mm.

[0029] 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.

[0030] 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.

[0031] The utility model also discloses an air conditioner indoor unit, in which the air conditioner indoor unit noise reduction air duct structure described above is arranged.

Claims

1. A noise reduction 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 two ends of the fan being respectively a motor connection end (110) and a bearing connection end (120), 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); and the top height of the guide rib (300) close to the motor connection end (110) is greater than the top height of the guide rib (300) close to the bearing connection end (120).

2. The noise reduction air duct structure of the air conditioner indoor unit according to claim 1, characterized in that: Taking one third of the length of the volute tongue body (200) as the partition boundary, the partition at one end of the volute tongue body (200) close to the motor connection end (110) is the first partition, the partition at one end of the volute tongue body (200) close to the bearing connection end (120) is the second partition, and the partition located in the middle of the volute tongue body (200) is the middle partition; the top height of the guide rib (300) located in the first partition is greater than the top height of the guide rib (300) located in the second partition.

3. The noise reduction air duct structure of the air conditioner indoor unit according to claim 2, characterized in that: The top height of the guide rib (300) located in the middle section of the volute tongue body (200) is greater than the top height of the guide rib (300) located in the first section and the second section.

4. The noise reduction air duct structure of the air conditioner indoor unit according to claim 2, characterized in that: The top height of the guide rib (300) located in the middle section of the volute tongue body (200) is smaller than the top height of the guide rib (300) located in the first section and the second section.

5. The noise reduction air duct structure of the air conditioner indoor unit according to claim 2, characterized in that: The thickness of the guide rib (300) is 2 to 3 mm, and the width of the guide groove (400) is 2 to 3 mm; the top height of the guide rib (300) located in the first partition is 6 to 7 mm, and the top height of the guide rib (300) located in the second partition is 4 to 5 mm.

6. The noise reduction air duct structure of the air conditioner indoor unit 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.

7. The noise reduction air duct structure of the air conditioner indoor unit according to claim 6, 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).

8. An air conditioner indoor unit, characterized in that: It comprises the noise reduction air duct structure of the indoor unit of the air conditioner as described in any one of claims 1 to 7.

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