A volute structure and a range hood

Abstract

The utility model discloses a volute structure, including volute body, is equipped with air duct on it, the air duct includes volute chamber, with linear chamber that communicates with volute chamber, be equipped with air inlet on volute chamber, be equipped with air outlet on linear chamber, linear chamber outside with volute chamber outside tangent connection, the junction of linear chamber inside with volute chamber inside is convex and is equipped with extension, after the extension along volute chamber inside extends to the air duct, turns back and extends to the direction close to linear chamber inside and connects with linear chamber inside. The utility model provides a volute structure, the convex structure of extension, forms a smooth flow guide structure. It can effectively guide the airflow that flows out from volute chamber inside, makes it change direction smoothly, stably enters linear chamber, reduces energy loss and airflow noise, to ultimately realize the comprehensive promotion of volute fluid power efficiency.

Description

Technical Field

[0001] This utility model relates to the field of range hood technology, and in particular to a volute structure and a range hood. Background Technology

[0002] The volute, as an important fluid collection and guiding component, is widely used in equipment such as fans, pumps, and range hoods. Traditional volute structures typically consist of a volute cavity and an adjacent linear outlet cavity. The volute cavity is responsible for collecting the rotating fluid in an orderly manner, while the linear cavity is responsible for converting part of the fluid's dynamic pressure into static pressure and guiding the fluid out smoothly. However, existing volute structures suffer from a common technical challenge: when fluid enters the relatively narrow linear cavity from the gradually expanding volute cavity, severe flow separation occurs in the transition region between the two, leading to a decrease in the volute's hydrodynamic efficiency (i.e., total pressure efficiency). Although this problem is widely recognized by those skilled in the art, conventional solutions, such as simply smoothing the connection or using a large-radius circular arc transition, while improving flow conditions to some extent, have limited effectiveness in suppressing internal flow separation and cannot fundamentally and efficiently guide the airflow smoothly to change direction and fill the flow channel. Utility Model Content

[0003] To solve the above problems, this technical solution provides a volute structure and a range hood.

[0004] To achieve the above objectives, the technical solution is as follows:

[0005] A volute structure, including

[0006] The volute body has an air duct, which includes a volute cavity and a straight cavity communicating with the volute cavity; the volute cavity has an air inlet and the straight cavity has an air outlet.

[0007] The outer side of the straight cavity is tangentially connected to the outer side of the volute cavity, and an extension is provided at the connection between the inner side of the straight cavity and the inner side of the volute cavity;

[0008] The extension extends along the inner side of the volute cavity into the air duct, then turns back and extends towards the inner side of the straight cavity until it connects with the inner side of the straight cavity.

[0009] As described above, in a volute structure, the extension includes an arc-shaped section concentrically arranged with the air inlet, and an inclined section forming an obtuse angle with the inner side of the straight cavity.

[0010] In the volute structure described above, the distance 'a' between the arc-shaped segment and the air inlet is 5mm ± 2mm.

[0011] In the volute structure described above, the extension further includes an arc segment connecting the arc-shaped segment and the inclined segment.

[0012] In the volute structure described above, the connection point between the circular arc segment and the arc-shaped segment is point B, and the angle b between the tangent line passing through point B and being tangent to the arc-shaped segment and the inclined segment is 18°±2°.

[0013] In the volute structure described above, the width c of the air outlet is 65mm ± 5mm.

[0014] In the volute structure described above, the extension angle d of the arc segment is 38±2°.

[0015] In the volute structure described above, the straight line passing through the center of the air inlet and in the same direction as the length of the straight cavity is called straight line M, and the straight line passing through the center of the arc segment and the center of the air inlet is called straight line N. The angle e between straight line M and straight line N is 30°±2°.

[0016] A range hood, including a volute structure as described above.

[0017] The beneficial effects of this application are:

[0018] This invention provides a volute structure with a protruding extension that forms a smooth flow guide. This effectively guides the airflow exiting from the inside of the volute cavity, allowing it to smoothly change direction and enter the straight cavity, reducing energy loss and airflow noise, thereby ultimately achieving a comprehensive improvement in the hydrodynamic efficiency of the volute. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below.

[0020] Figure 1 This is a schematic diagram of the structure of this utility model. Figure 1 ;

[0021] Figure 2 This is a schematic diagram of the structure of this utility model. Figure 2 ;

[0022] Figure 3 This is a schematic diagram of an existing volute structure. Detailed Implementation

[0023] To make the technical problems solved, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0024] A volute structure, including

[0025] The volute body 1 has an air duct 2 on it. The air duct 2 includes a volute cavity 21 and a straight cavity 22 communicating with the volute cavity 21. The volute cavity 21 has an air inlet 23 and the straight cavity 22 has an air outlet 24.

[0026] The outer side of the straight cavity 22 is tangentially connected to the outer side of the volute cavity 21, and an extension 3 is provided at the connection between the inner side of the straight cavity 22 and the inner side of the volute cavity 21.

[0027] The extension 3 extends along the inner side of the volute cavity 21 into the air duct 2, then turns back and extends towards the inner side of the straight cavity 22 until it connects with the inner side of the straight cavity 22.

[0028] This invention provides a volute structure with a protruding extension that forms a smooth flow guide. This effectively guides the airflow exiting from the inside of the volute cavity, allowing it to smoothly change direction and enter the straight cavity, reducing energy loss and airflow noise, thereby ultimately achieving a comprehensive improvement in the hydrodynamic efficiency of the volute.

[0029] Furthermore, as a preferred embodiment of this solution and not a limitation thereof, the extension 3 includes an arc-shaped segment 31 concentrically arranged with the air inlet 23, and an inclined segment 32 forming an obtuse angle with the inner side of the straight cavity 22. The arc-shaped segment 31 concentric with the air inlet ensures that the airflow follows a smooth circular path during the initial turning phase, reducing the impact with the wall; while the inclined segment 32 forming an obtuse angle with the inner side of the straight cavity provides a gradual, non-abrupt guiding surface, allowing the airflow to more smoothly integrate into the flow direction of the straight cavity, further optimizing the flow field and consolidating the noise reduction and efficiency improvement effects.

[0030] Furthermore, as a preferred embodiment of this solution, and not a limitation thereof, the distance 'a' between the arc-shaped segment 31 and the air inlet 23 is 5mm ± 2mm. This achieves an optimal balance between airflow guidance and channel resistance. An excessively large distance would weaken the guiding effect, while an excessively small distance would increase unnecessary flow resistance. This size range ensures that the arc-shaped segment 31 exerts maximum guiding efficiency with minimal resistance.

[0031] Furthermore, as a preferred embodiment of this solution and not a limitation, the extension 3 also includes an arc segment 33 connecting the arc-shaped segment 31 and the inclined segment 32. This eliminates any sharp angles or abrupt changes in curvature that may exist at the connection between the arc-shaped segment 31 and the inclined segment 32, ensuring the smooth continuity of the overall guide surface of the extension 3, thereby avoiding the generation of new local vortices at the connection point and making the airflow direction more smooth and natural.

[0032] Furthermore, as a preferred embodiment of this solution and not a limitation, the connection point between the circular arc segment 33 and the arc-shaped segment 31 is point B. The angle b between the tangent line passing through point B and tangent to the arc-shaped segment 31 and the inclined segment 32 is 18°±2°. This precisely controls the turning rate of the airflow as it transitions from spiral motion to linear motion. This angle range ensures a smooth and stable change in airflow direction, and is a key parameter for achieving flow field optimization and further reducing flow losses and vortex intensity.

[0033] Furthermore, as a preferred embodiment of this solution and not a limitation, the width c of the air outlet 24 is 65mm ± 5mm. The outlet area of ​​the volute is optimized to match the flow rate and pressure requirements of the entire duct system. This size range can maintain a suitable airflow velocity at the outlet while ensuring sufficient airflow, which helps to reduce outlet losses and suppress airflow-generated noise.

[0034] Furthermore, as a preferred embodiment of this solution and not a limitation, the extension angle d of the arc segment 31 is 38±2°. This defines the range within which the extension 3 intervenes in and guides the airflow within the volute cavity. This angular range ensures effective coverage of the critical separation area without excessively extending and interfering with the main flow field, achieving precise and efficient flow field control.

[0035] Furthermore, as a preferred embodiment of this solution, and not a limitation thereof, the straight line passing through the center of the air inlet 23 and in the same direction as the length of the straight cavity 22 is designated as line M, and the straight line passing through the center of the arc segment 33 and the center of the air inlet 23 is designated as line N. The angle e between line M and line N is 30°±2°. The relative position of the arc segment 33 within the volute is precisely determined geometrically. This position is optimized to ensure that the guiding effect of the extension 3 begins at the phase when the airflow most needs guidance, which is a crucial guarantee for the optimal overall flow field design.

[0036] The range hood includes a volute structure as described above. Due to the inclusion of this volute structure, the range hood's technical advantage lies in improved overall performance, specifically: higher airflow and static pressure at the same power output, significantly reduced operating noise, and reduced energy consumption, thereby achieving superior smoke extraction and a more comfortable user experience.

[0037] The above description is only a preferred embodiment of this application and is not intended to limit the scope of implementation of this application. Any other embodiments whose principles and basic structures are the same as or similar to those of this application are within the protection scope of this application.

Claims

1. A volute structure, characterized in that: include The volute body (1) has an air duct (2) thereon, the air duct (2) includes a volute cavity (21) and a straight cavity (22) communicating with the volute cavity (21); the volute cavity (21) has an air inlet (23) and the straight cavity (22) has an air outlet (24); The outer side of the straight cavity (22) is tangentially connected to the outer side of the volute cavity (21), and an extension (3) is provided at the connection between the inner side of the straight cavity (22) and the inner side of the volute cavity (21); The extension (3) extends into the air duct (2) along the inner side of the volute cavity (21), then turns back and extends towards the inner side of the straight cavity (22) to connect with the inner side of the straight cavity (22).

2. The volute structure according to claim 1, characterized in that: The extension (3) includes an arc-shaped section (31) concentrically arranged with the air inlet (23) and an inclined section (32) forming an obtuse angle with the inner side of the straight cavity (22).

3. The volute structure according to claim 2, characterized in that: The distance a between the arc segment (31) and the air inlet (23) is 5mm ± 2mm.

4. A volute structure according to claim 2, characterized in that: The extension (3) also includes an arc segment (33) connecting the arc segment (31) and the inclined segment (32).

5. A volute structure according to claim 4, characterized in that: The point where the circular arc segment (33) connects with the arc segment (31) is point B. The angle b between the tangent line passing through point B and being tangent to the arc segment (31) and the inclined segment (32) is 18°±2°.

6. A volute structure according to claim 1, characterized in that: The width c of the air outlet (24) is 65mm ± 5mm.

7. A volute structure according to claim 2, characterized in that: The extension angle d of the arc segment (31) is 38±2°.

8. A volute structure according to claim 4, characterized in that: The straight line passing through the center of the air inlet (23) and in the same direction as the length of the straight cavity (22) is called straight line M. The straight line passing through the center of the arc segment (33) and the center of the air inlet (23) is called straight line N. The angle e between straight line M and straight line N is 30°±2°.

9. A range hood, characterized in that: Including a volute structure as described in any one of claims 1-8.

Images