Volute tongue of air conditioner

Abstract

The utility model relates to a volute tongue of an air conditioner, and belongs to the technical field of air duct structural components of air conditioners. The volute tongue comprises a volute tongue body, the outer surface of the volute tongue body comprises a volute tongue flow guide face and a volute tongue wind blocking face, the volute tongue flow guide face and the volute tongue wind blocking face are connected through a volute tongue tip windward face to form a smooth transition continuous curved face, and the volute tongue tip windward face is of a fillet structure. A plurality of volute tongue flow guide grooves are formed in the outer surface of the volute tongue body, and the volute tongue flow guide grooves are formed in the length direction of the volute tongue body at intervals; the starting point of each volute tongue flow guide groove is located at the joint of the windward side of the volute tongue tip and the volute tongue flow guide face. The tail end of each volute tongue flow guide groove is located on the volute tongue wind blocking face. And the width of the volute tongue flow guide groove is gradually reduced in the direction from the starting point to the tail end. While noise is improved, surge can be avoided as much as possible, and performance loss can be reduced as much as possible.

Description

Technical Field

[0001] The utility model relates to a volute tongue of an air conditioner, belonging to the technical field of air duct structural components of air conditioners. Background Art

[0002] When the air conditioner is working, the rotation of the fan will generate aerodynamic noise. Noise is an intuitive indicator during the use of the air conditioner and is receiving more and more attention.

[0003] Noise includes noise value and noise quality. The ideal state is to optimize both. The aerodynamic noise of the fan includes eddy noise and rotation noise. Eddy noise is a wide-band low-amplitude noise, and rotation noise is a narrow-band high-amplitude noise. Rotation noise is discrete. For the human ear, rotation noise is more difficult to accept than eddy noise and has a greater impact on comfort. Therefore, improving rotation noise is the focus of cross-flow fan noise reduction research, which is also the focus of air conditioner indoor unit noise treatment.

[0004] The volute tongue is an important component structure of the indoor unit fan of the air conditioner. Since the structure of the volute tongue is the simplest, it involves the least verification content and the lowest modification cost, compared with other solidified structures of the fan, improving the volute tongue is the preferred solution for optimizing noise.

[0005] For example, the patent document with the announcement number CN209026955U discloses a volute tongue for an indoor unit of an air conditioner, wherein a windward surface and a wind guide surface are provided on the volute tongue body, and the windward surface and the wind guide surface are transitioned by a curved arc segment; the outer surfaces of the windward surface and the wind guide surface are both planes, the angle between the windward surface and the wind guide surface is 58-75°, and the width of the windward surface is 13-28 mm. This solution makes the windward surface and the wind guide surface of the volute tongue planes, connects the windward surface and the wind guide surface by a curved arc segment transition, increases the angle between the windward surface and the wind guide surface, and reduces the width of the windward surface, so that the airflow at the volute tongue flows smoothly and evenly, and reduces the noise generated during the operation of the indoor unit of the air conditioner to a certain extent, but there is still much room for improvement.

[0006] The patent document with the announcement number CN205014560U discloses a volute tongue device, including a mounting plate, a plurality of volute tongue teeth evenly arranged on the mounting plate, an air guide channel is formed between any two adjacent volute tongue teeth, and along the front end to the rear end direction of the volute tongue teeth, the width of the volute tongue teeth gradually increases to the maximum width and then gradually decreases, and the distance from the front end to the position of the maximum width is less than the distance from the position of the maximum width to the rear end; and the surface of the volute tongue teeth is a streamlined surface. The volute tongue device provided by this scheme reduces the separation of airflow and mixing with the surrounding fluid by designing the feature that the width of the volute tongue teeth increases first and then decreases, thereby avoiding energy fluctuations and reducing noise. However, due to the air leakage effect of the serrated grooves formed between the volute tongue teeth, the air duct performance will inevitably be reduced, and even a surge effect will occur. Utility Model Content

[0007] The technical problem to be solved by the utility model is to provide a volute tongue of an air conditioner, which can improve the noise while avoiding surge and reducing the performance loss as much as possible.

[0008] In order to solve the above technical problems, the technical solution adopted by the utility model is: the volute tongue of the air conditioner includes a volute tongue body, the outer surface of the volute tongue body includes a volute tongue guide surface and a volute tongue windshield surface, the volute tongue guide surface and the volute tongue windshield surface are connected by the windward surface of the volute tongue tip to form a smooth transition continuous curved surface, the windward surface of the volute tongue tip is a chamfered structure, and the outer surface of the volute tongue body is provided with a plurality of volute tongue guide grooves, and the volute tongue guide grooves are arranged at intervals along the length direction of the volute tongue body; the starting point of each volute tongue guide groove is located at the intersection of the windward surface of the volute tongue tip and the volute tongue guide surface; the end of each volute tongue guide groove is located on the volute tongue windshield surface; the width of the volute tongue guide groove shows a gradually decreasing trend in the direction from the starting point to the end.

[0009] It is further preferred that the width of the volute tongue guide groove at its starting point ranges from 3 mm to 6 mm; and the width of the volute tongue guide groove at its end ranges from 0 to 2 mm.

[0010] It is further preferred that the difference between the width of the volute tongue guide groove at its starting point and its width at its end is greater than or equal to 2 mm.

[0011] It is further preferred that the depth of the volute tongue guide groove increases gradually first and then decreases gradually in the direction from the starting point to the end point; the depth range corresponding to the position where the depth of the volute tongue guide groove is the maximum is 2 mm to 10 mm.

[0012] It is further preferred that the bottom wall of the volute tongue guide groove is composed of an arcuate guide surface arranged near the starting point of the volute tongue guide groove and a guide plane arranged near the end of the volute tongue guide groove, and the arcuate guide surface and the guide plane are smoothly transitionally connected.

[0013] It is further preferred that the inner wall of the volute tongue guide groove is provided with a chamfered structure at the outer surface of the volute tongue body.

[0014] It is further preferred that the volute tongue guide surface and the volute tongue wind shielding surface are both planes, and the angle formed between the volute tongue guide surface and the volute tongue wind shielding surface is 50° to 80°.

[0015] It is further preferred that: taking any cross section perpendicular to the length direction of the volute tongue body as a reference plane, the tangent point between the windward surface of the volute tongue tip and the windshield surface of the volute tongue is set as point A, the end of the volute tongue guide groove is set as point B, and the distance between point A and point B is equal to 30% to 60% of the width of the volute tongue windshield surface, and the width of the volute tongue windshield surface ranges from 30 mm to 60 mm.

[0016] The beneficial effect of the utility model is as follows: through the unique structural design of the guide groove of the volute tongue, after the airflow is blown out by the cross-flow fan, part of the airflow is divided into two parts under the action of the windward surface of the tip of the volute tongue, the first part is blown out to the outside along the air outlet of the cross-flow channel, and the second part flows back through the gap between the windward surface of the tip of the volute tongue and the wind-shielding surface of the volute tongue and the cross-flow fan, and returns to the inside of the cross-flow fan; in this process, the second part of the airflow will hinder the return of the airflow due to the narrowing of the width of the volute tongue groove, enhance the squeezing effect of the wind-shielding surface of the volute tongue, and finally weaken the pressure loss effect of the grooved volute tongue, thereby avoiding the surge effect as much as possible. At the same time, the concave part (i.e., the guide groove of the volute tongue) arranged at a certain interval and the non-concave flat part of the volute tongue disperse the second part of the return airflow, so that the airflow returning to the inside of the cross-flow fan is dispersed and the pace is inconsistent, thereby reducing the noise problem caused by energy concentration. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic cross-sectional view of the cross-flow air duct structure when the utility model is applied and implemented.

[0018] Figure 2 yes Figure 1 A partial enlarged view of point D in the figure.

[0019] Figure 3 It is a schematic diagram of the three-dimensional structure of the snail tongue in the utility model.

[0020] Figure 4 It is a schematic diagram of the width characteristic structure corresponding to the volute tongue guide groove in the utility model.

[0021] Figure 5 It is a schematic diagram of the bottom wall characteristics and terminal position characteristic structure corresponding to the volute tongue guide groove in the utility model.

[0022] Parts marked in the figure: volute tongue body 1, wind shielding and collecting assembly 2, crossflow impeller 3, crossflow duct outlet 4; volute tongue guide surface 11, volute tongue tip windward surface 12, volute tongue wind shielding surface 13, volute tongue guide groove 14, arc guide surface 141, guide plane 142, chamfer structure 143. DETAILED DESCRIPTION

[0023] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0024] like Figures 1 to 5 As shown, the utility model includes a volute tongue body 1, the outer surface of the volute tongue body 1 includes a volute tongue guide surface 11 and a volute tongue windshield surface 13, the volute tongue guide surface 11 and the volute tongue windshield surface 13 are connected by the volute tongue tip windward surface 12 to form a smooth transition continuous curved surface, the volute tongue tip windward surface 12 is a rounded structure, and the outer surface of the volute tongue body 1 is provided with a plurality of volute tongue guide grooves 14, and the volute tongue guide grooves 14 are arranged at intervals along the length direction of the volute tongue body 1; the starting point of each volute tongue guide groove 14 is located at the intersection of the volute tongue tip windward surface 12 and the volute tongue guide surface 11; the end of each volute tongue guide groove 14 is located at the volute tongue windshield surface 13; the width of the volute tongue guide groove 14 shows a gradually decreasing trend in the direction from the starting point to the end. Specifically, the volute tongue guide surface 11 usually refers to the guide surface of the air outlet in the crossflow air duct; the volute tongue windshield surface 13 usually refers to the curved surface close to the crossflow fan. It can be understood that the key technical point of the present invention lies in the unique structural design of the volute tongue guide groove 14. The specific installation method of the volute tongue body 1 can be implemented with reference to the prior art. Generally, the volute tongue body 1 can be installed at a suitable position on one side of the crossflow impeller 3 through a snap connection structure. The length direction of the volute tongue body 1 in the present invention corresponds to the axial direction of the crossflow impeller 3.

[0025] In order to achieve better diversion and noise reduction effects, the specific size parameters of the volute tongue guide groove 14 can generally be reasonably selected within the following range: the width of the volute tongue guide groove 14 at its starting point ranges from 3 mm to 6 mm (the width parameter is Figure 4 The width of the volute tongue guide groove 14 at its end ranges from 0 to 2 mm (the width parameter is Figure 4 W2 is marked in the figure, and it can be further preferably 0). Preferably, the difference between the width of the volute tongue guide groove 14 at its starting point and its width at the end is greater than or equal to 2 mm, that is, W1-W2 is greater than or equal to 2 mm. In the preferred embodiment, the volute tongue guide surface 11 and the volute tongue wind shielding surface 13 are both planes, and the width W1 of the volute tongue guide groove 14 at the starting point is the dimension width on the tangent line at the tangent point (corresponding to the axial direction of the throughflow impeller 3); the width W2 of the volute tongue guide groove 14 at the end is the width of the groove when the groove feature ends on the volute tongue wind shielding surface 13 (corresponding to the axial direction of the throughflow impeller 3).

[0026] Under the condition that the starting position, the end position, and the width gradient trend specified above are met, the bottom wall structure of the volute tongue guide groove 14 usually has no other special requirements, as long as it is a smooth continuous curved surface suitable for diversion. The preferred solution is as follows: the depth of the volute tongue guide groove 14 shows a trend of gradually increasing first and then gradually decreasing in the direction from the starting point to the end; the depth range corresponding to the position where the depth of the volute tongue guide groove 14 is the maximum is 2mm to 10mm. The bottom wall of the volute tongue guide groove 14 is composed of an arc-shaped guide surface 141 arranged near the starting point of the volute tongue guide groove 14 and a guide plane 142 arranged near the end of the volute tongue guide groove 14, and the arc-shaped guide surface 141 and the guide plane 142 are smoothly transitionally connected.

[0027] To facilitate flow diversion, the inner wall of the volute tongue flow diversion groove 14 is provided with a chamfered structure 143 at the outer surface of the volute tongue body 1 .

[0028] In order to achieve better flow guiding and noise reduction effects, the following preferred solution can also be adopted: the volute tongue flow guiding surface 11 and the volute tongue wind shielding surface 13 are both planes, and the angle formed between the volute tongue flow guiding surface 11 and the volute tongue wind shielding surface 13 is 50° to 80°. Taking any cross section perpendicular to the length direction of the volute tongue body 1 as a reference plane, the tangent point between the windward surface 12 of the volute tongue tip and the volute tongue wind shielding surface 13 is set as point A, the end of the volute tongue flow guiding groove 14 is set as point B, and the distance between point A and point B (the distance value is Figure 5 W3 in the figure) is equal to the width of the windshield surface 13 of the volute tongue (the width is Figure 5 The width of the windshield surface 13 of the volute tongue is 30% to 60mm.

Claims

1. A volute tongue of an air conditioner, comprising a volute tongue body (1), the outer surface of the volute tongue body (1) comprising a volute tongue flow guide surface (11) and a volute tongue wind shielding surface (13), the volute tongue flow guide surface (11) and the volute tongue wind shielding surface (13) being connected via a volute tongue tip windward surface (12) to form a smooth transition continuous curved surface, the volute tongue tip windward surface (12) being a rounded structure, the outer surface of the volute tongue body (1) being provided with a plurality of volute tongue flow guide grooves (14), the volute tongue flow guide grooves (14) being arranged at intervals along the length direction of the volute tongue body (1); characterized in that: The starting point of each volute tongue guide groove (14) is located at the intersection of the windward surface (12) of the volute tongue tip and the volute tongue guide surface (11); the end of each volute tongue guide groove (14) is located at the volute tongue windshield surface (13); and the width of the volute tongue guide groove (14) shows a gradually decreasing trend in the direction from the starting point to the end.

2. The volute tongue of the air conditioner according to claim 1, characterized in that: The width of the volute tongue guide groove (14) at its starting point ranges from 3 mm to 6 mm; the width of the volute tongue guide groove (14) at its end ranges from 0 mm to 2 mm.

3. The volute tongue of the air conditioner according to claim 2, characterized in that: The difference between the width of the volute tongue guide groove (14) at its starting point and its width at its end is greater than or equal to 2 mm.

4. The volute tongue of the air conditioner according to claim 1, characterized in that: The depth of the volute tongue guide groove (14) shows a trend of first gradually increasing and then gradually decreasing in the direction from the starting point to the end point; the depth range corresponding to the position where the volute tongue guide groove (14) has the maximum depth is 2 mm to 10 mm.

5. The volute tongue of the air conditioner according to claim 4, characterized in that: The bottom wall of the volute tongue flow guide groove (14) is composed of an arcuate flow guide surface (141) arranged near the starting point of the volute tongue flow guide groove (14) and a flow guide plane (142) arranged near the end of the volute tongue flow guide groove (14), and the arcuate flow guide surface (141) and the flow guide plane (142) are smoothly transitionally connected.

6. The volute tongue of an air conditioner according to claim 1, characterized in that: The inner wall of the volute tongue guide groove (14) is provided with a chamfered structure (143) at the outer surface of the volute tongue body (1).

7. The volute of an air conditioner according to any one of claims 1 to 6, characterized in that: The volute tongue flow guide surface (11) and the volute tongue wind shielding surface (13) are both planes, and the angle formed between the volute tongue flow guide surface (11) and the volute tongue wind shielding surface (13) is 50° to 80°.

8. The volute tongue of the air conditioner according to claim 7, characterized in that: Taking any cross section perpendicular to the length direction of the volute tongue body (1) as a reference plane, the tangent point between the windward surface (12) of the volute tongue tip and the volute tongue windshield surface (13) is set as point A, the end of the volute tongue guide groove (14) is set as point B, and the distance between point A and point B is equal to 30% to 60% of the width value of the volute tongue windshield surface (13), and the width value range of the volute tongue windshield surface (13) is 30 mm to 60 mm.

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