Fan and extractor hood

Abstract

The application discloses a fan and an extractor hood, wherein the fan comprises a volute, a volute tongue and an impeller, the volute tongue is arranged on the volute and forms an air outlet with the volute, the impeller is arranged in the volute, the volute has an inner cavity profile line surrounding the impeller, and the inner cavity profile line is arranged in imitation of an Archimedes spiral line; the inner cavity profile line comprises a first arc line segment and a second arc line segment, the first arc line segment and the second arc line segment are sequentially connected from one end of the volute connected with the volute tongue to an end away from the volute tongue; the curvature of the first arc line segment is A1, the curvature of a corresponding line segment of the Archimedes spiral line and the first arc line segment is B1, A1 is greater than B1; the curvature of the second arc line segment is A2, the curvature of a corresponding line segment of the Archimedes spiral line and the second arc line segment is B2, and A2 is not greater than B2. The technical scheme of the application can obtain better air performance under the requirement of size limitation by improving the inner cavity profile line of the volute.

Description

Technical Field

[0001] This invention relates to the field of kitchen appliances technology, and in particular to a fan and a range hood. Background Technology

[0002] In existing technologies, thinner fan systems naturally have poorer air performance than thicker ones. Generally, a large impeller and large volute are used to reduce overall operating noise, thus enabling thinner fan systems to have suitable noise and airflow characteristics. Traditional volute internal cavity profile design is typically based on an Archimedean spiral using a four-segment arc design method. This design method results in a larger projected area of ​​the volute internal cavity profile on the fan's orthographic projection, requiring a larger housing, which affects the range hood's installation, appearance, and user experience. Summary of the Invention

[0003] The main objective of this invention is to propose a fan that optimizes the fan's performance within a given housing volume.

[0004] To achieve the above objectives, the present invention proposes a fan, the fan comprising:

[0005] The system comprises a volute, a volute tongue, and an impeller. The volute tongue is disposed within the volute and forms an air outlet with the volute. The impeller is disposed within the volute. The volute has an inner cavity profile surrounding the impeller, which is biomimetic to an Archimedean spiral. The inner cavity profile includes a first arc segment and a second arc segment, which are sequentially connected from one end of the volute connected to the volute tongue to the end away from the volute tongue. The curvature of the first arc segment is A1, and the curvature of the corresponding segment of the Archimedean spiral is B1, where A1 is greater than B1. The curvature of the second arc segment is A2, and the curvature of the corresponding segment of the Archimedean spiral is B2, where A2 is not greater than B2.

[0006] In one embodiment, the diameter of the impeller is D; the radius of curvature of the first arc segment is R11, and the radius of curvature of the Archimedean spiral corresponding to the first arc segment is R12;

[0007] It satisfies: 0.005≤(R11-R12) / D≤0.02.

[0008] In one embodiment, the diameter of the impeller is D; the radius of curvature of the second arc segment is R21, and the radius of curvature of the corresponding line segment of the Archimedean spiral and the second arc segment is R22;

[0009] It satisfies: 0≤(R22-R21) / D≤0.05.

[0010] In one embodiment, the inner cavity profile further includes a third arc segment, which is connected to the end of the second arc segment away from the first arc segment. The curvature of the third arc segment is A3, and the curvature of the Archimedean spiral corresponding to the third arc segment is B3, wherein A3 is not less than B3.

[0011] In one embodiment, the first arc segment and the second arc segment are smoothly connected;

[0012] And / or, the second arc segment and the third arc segment are smoothly connected.

[0013] In one embodiment, the volute includes a front plate, a back plate, and a surrounding plate, the front plate, the back plate, and the surrounding plate forming an inner cavity, the impeller and the volute tongue being disposed in the inner cavity, the air outlet communicating with the inner cavity, the surrounding plate surrounding the impeller, and the inner cavity profile being the profile of the surrounding plate.

[0014] In one embodiment, a cross coordinate system is established with the center O of the impeller as the origin, the line connecting A and B as the Y-axis, and the line connecting C and D as the X-axis. Point A is the point on the volute farthest from the plane containing the air outlet; point B is the intersection of line A0 and the inner cavity profile; C and D are the two intersections of the line passing through point O and the inner cavity profile.

[0015] The air outlet is located in the fourth quadrant of the cross coordinate system;

[0016] At least a portion of the first arc segment lies within the first quadrant of the cross coordinate system.

[0017] In one embodiment, at least a portion of the second arc segment lies within the second and third quadrants of the cross coordinate system.

[0018] In one embodiment, at least a portion of the third arc segment is located in the fourth quadrant of the cross coordinate system.

[0019] This invention also discloses a range hood, comprising the aforementioned fan, the fan including a volute, a volute tongue, and an impeller. The volute tongue is disposed within the volute and forms an air outlet with the volute. The impeller is disposed within the volute. The volute has an inner cavity profile surrounding the impeller, the inner cavity profile being biomimetic to an Archimedean spiral. The inner cavity profile includes a first arc segment and a second arc segment, the first arc segment and the second arc segment being sequentially connected from one end of the volute connected to the volute tongue to the end away from the volute tongue. The curvature of the first arc segment is A1, the curvature of the Archimedean spiral corresponding to the first arc segment is B1, and A1 is greater than B1. The curvature of the second arc segment is A2, the curvature of the Archimedean spiral corresponding to the second arc segment is B2, and A2 is not greater than B2.

[0020] The technical solution of this invention improves the inner cavity profile of the volute, so that the fan provided by this invention can reduce the projected area of ​​the volute while ensuring consistent air performance, thereby reducing the volume of the range hood; or, it can achieve better air performance under size constraints. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the structure of a fan according to an embodiment of the present invention;

[0023] Figure 2 A schematic diagram of the shape of the inner cavity profile of the volute;

[0024] Figure 3 for Figure 2 A schematic diagram of establishing a cross coordinate system in the middle;

[0025] Figure 4 This is a spectrum diagram of the fan of the present invention.

[0026] Explanation of icon numbers:

[0027] 10 Fan 110 First arc segment 100 Snail shell 120 Second arc segment 200 Cochlear tongue 130 Third arc segment 300 impeller 101 front panel 400 air vent 102 Back panel 500 inner cavity 103 Enclosure

[0028] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0030] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0031] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, if the word "and / or" appears throughout the text, it means including three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution that simultaneously satisfies A and B. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0032] This invention proposes a fan.

[0033] In embodiments of the present invention, such as Figures 1 to 4 As shown, the fan 10 includes a volute 100, a volute tongue 200, and an impeller 300. The volute tongue 200 is disposed in the volute 100 and forms an air outlet 400 with the volute 100. The impeller 300 is disposed inside the volute 100. The volute 100 has an inner cavity profile surrounding the impeller 300, and the inner cavity profile is biomimetic to an Archimedean spiral. The inner cavity profile includes a first arc segment 110 and a second arc segment 120. The first arc segment 110 and the second arc segment 120... Two arc segments 120 are connected sequentially from one end of the volute 100 connected to the volute tongue 200 to the end away from the volute tongue 200; the curvature of the first arc segment 110 is A1, the curvature of the Archimedean spiral corresponding to the first arc segment 110 is B1, and A1 is greater than B1; the curvature of the second arc segment 120 is A2, the curvature of the Archimedean spiral corresponding to the second arc segment 120 is B2, and A2 is not greater than B2.

[0034] The fan 10 provided in this invention is typically a centrifugal fan 10, generally used in range hoods. However, this embodiment can also be applied to other suitable scenarios. Specifically, the fan 10 typically includes a volute 100, a volute tongue 200, and an impeller 300. The volute 100 defines a mounting cavity for accommodating the impeller. The volute 100 has an air intake and an air outlet 400 communicating with the mounting cavity. The volute tongue 200 is generally mounted on the volute 100 and located in the mounting cavity near the air outlet 400. The working principle of the fan 10 is that the motor drives the impeller 300 to rotate, performing work on the gas, which is then discharged radially through the diffusion effect of the volute 100. To achieve diffusion, the profile of the volute 100 is often designed using an Archimedean spiral.

[0035] In existing technologies, thinner fan systems (10) naturally have poorer air performance than thicker ones. Currently, large impellers (300) and large volutes (100) are commonly used to reduce overall operating noise, thus giving thinner fan systems suitable noise and airflow characteristics. Traditional volute designs (100) generally employ a four-segment arc design. This design results in a larger projected area for the volute (100), requiring a larger housing, which affects the range hood's installation, appearance, and user experience. Furthermore, to allow the unit to be installed under cabinets, the vertical dimensions of the volute (100)'s projected area are significantly limited, further degrading overall performance.

[0036] Based on this, the volute 100 is arranged around the inner cavity profile of the impeller 300 in a biomimetic Archimedean spiral pattern; wherein, the inner cavity profile includes a first arc segment 110 and a second arc segment 120, the first arc segment 110 and the second arc segment 120 being connected sequentially from the end of the volute 100 connected to the volute tongue 200 to the end away from the volute tongue 200; the curvature of the first arc segment 110 is A1, and the curvature of the corresponding line segment of the Archimedean spiral and the first arc segment 110 is B1, wherein A1 is greater than B1. In other words, relative to the center point O of the impeller 300, curve K expands outward compared to curve J. This allows the fan 10 obtained by using curve K as the inner cavity profile of the volute 100 at the first arc segment 110 to have better performance or a smaller size compared to the fan 10 obtained by using curve J as the inner cavity profile of the volute 100. This can be understood as having a larger internal flow area at the first arc segment 110. Therefore, on the one hand, it makes the airflow easier to flow near the volute 100, thereby improving the utilization efficiency of the impeller 300 in the first quadrant; on the other hand, even with a smaller volute 10 size, a larger volute tongue 200 clearance is still maintained, preventing blade frequency whistling.

[0037] Furthermore, the curvature of the second arc segment 120 is A2, and the curvature of the Archimedean spiral corresponding to the second arc segment 120 is B2, where A2 is not greater than B2. That is, at the second arc segment 120, relative to the center point O of the impeller 300, curve K contracts inward compared to curve J. This ensures that, given a fixed impeller 300 diameter, a fan 10 with curve K as the inner cavity profile of the volute 100 exhibits better performance or a smaller size compared to a fan 10 with curve J as the inner cavity profile. This can be understood as curve K having a smaller internal flow area than curve J, but the contraction is smaller to maintain the performance of the fan 10. Thus, on the one hand, the vertical dimension of the volute 100 is reduced, and on the other hand, abnormal pressure increases inside the volute 100 are avoided, preventing any impact on aerodynamic performance.

[0038] It should be noted that, firstly, "air performance" refers to the noise and air volume of the fan 10. Secondly, orthographic projection is a projection produced by projection lines radiating from a single point, called central projection; projection produced by parallel projection lines is called parallel projection. Here, orthographic projection refers to the projection of light parallel to the centerline of the impeller 300 onto a plane perpendicular to the centerline of the impeller 300. Thirdly, Figure 4 The spectrum diagrams obtained by testing the fan 10 with curve K as the inner cavity profile of the volute 100 and the fan 10 with curve J as the inner cavity profile of the volute 100 are shown. The horizontal axis represents the frequency, measured in Hz, which is the vibration frequency of the fan 10 fitted by the mutual collision of airflow and the collision of airflow with the inner wall of the volute 100. The vertical axis represents the sound intensity, measured in dB.

[0039] The technical solution of the present invention improves the inner cavity profile of the volute 100 so that the fan 10 provided by the present invention can reduce the projected area of ​​the orthographic projection of the volute 100 while ensuring consistent air performance, thereby reducing the volume of the range hood; or, it can achieve better air performance under size constraints.

[0040] In one embodiment, the diameter of the impeller 300 is D; the radius of curvature of the first arc segment 110 is R11, and the radius of curvature of the corresponding segment of the Archimedean spiral and the first arc segment 110 is R12. To ensure consistent aerodynamic performance while minimizing the projected area of ​​the volute 100, or to achieve better aerodynamic performance within size constraints, the values ​​of D, R11, and R12 satisfy the following condition: 0.005 ≤ (R11 - R12) / D ≤ 0.02. That is, compared to curve J, the outward expansion distance of curve K is between 0.5% and 2% of the impeller 300 diameter.

[0041] In another embodiment, the diameter of the impeller 300 is D; the radius of curvature of the second arc segment 120 is R21, and the radius of curvature of the corresponding segment of the Archimedean spiral and the second arc segment 120 is R22. Similar to the previous embodiment, to ensure consistent aerodynamic performance, the projected area of ​​the volute 100 is reduced, or better aerodynamic performance is achieved within size constraints. The following condition must be met: 0 ≤ (R22 - R21) / D ≤ 0.05. That is, compared to curve J, the inward contraction distance of curve K is no more than 5% of the diameter of the impeller 300.

[0042] In another embodiment, to further improve the aerodynamic performance of the fan 10 or reduce its size, please refer to [link to relevant documentation]. Figure 3 The inner cavity profile also includes a third arc segment 130, which connects to the end of the second arc segment 120 away from the first arc segment 110. The curvature of the third arc segment 130 is A3, and the curvature of the Archimedean spiral corresponding to the third arc segment 130 is B3, where A3 is not less than B3. In other words, at the third arc segment 130, relative to the center O of the impeller 300, curve K expands outward compared to curve J. This allows the fan 10 obtained with curve K as the inner cavity profile of the volute 100 to achieve better performance or a smaller size compared to obtaining a fan 10 with curve J as the inner cavity profile of the volute 100, provided the impeller 300 diameter is constant. This can be understood as curve K having a larger internal flow area than curve J, causing the airflow to slow down near the outlet section, thereby reducing flow losses in that section. On the other hand, this diffusion also causes the airflow to deflect towards the side wall of the volute 100, thereby reducing the airflow flow on the local volute tongue 200 side of the volute 100 outlet, thus weakening the whistling of the volute tongue 200.

[0043] In one embodiment, to prevent sharp structures at the junctions of the first arc segment 110, the second arc segment 120, and the third arc segment 130 from causing greater noise, a smooth connection is made between the first arc segment 110 and the second arc segment 120; and / or, a smooth connection is made between the second arc segment 120 and the third arc segment 130.

[0044] In a preferred embodiment, please refer to Figure 1The volute 100 includes a front plate 101, a back plate 102, and a surrounding plate 103. The front plate 101, the back plate 102, and the surrounding plate 103 enclose an inner cavity 500. The impeller 300 and the volute tongue 200 are disposed in the inner cavity 500. The air outlet 400 communicates with the inner cavity 500. The surrounding plate 103 is arranged around the impeller 300. The inner cavity profile is the profile of the surrounding plate 103. In other words, specifically in the manufacturing of the product, the inner cavity profile refers to the shape of the surrounding plate 103.

[0045] For example, a cross coordinate system is established with the center point O of the impeller 300 as the origin, the line connecting A and B as the Y-axis, and the line connecting C and D as the X-axis. Point A is the point on the volute 100 that is farthest from the plane where the air outlet 400 is located, and point B is the intersection of the straight line A0 and the inner cavity profile. C and D are the two intersection points of the straight line passing through point O and the inner cavity profile. The air outlet 400 is located in the fourth quadrant of the cross coordinate system, and at least a portion of the first arc segment 110 is located in the first quadrant of the cross coordinate system.

[0046] Please refer to the main text. Figure 2 and Figure 3 Curve J is the internal cavity profile of the volute 100 drawn based on the Archimedean spiral, and curve K is the profile of the volute 100 proposed in this invention. In this embodiment, firstly, the width and height of the volute 100 are determined, and the diameter of the impeller 300 of the volute 100 is determined according to the width and height of the volute 100; secondly, the impeller 300 of the corresponding size is drawn on the drawing software according to the diameter of the impeller 300; the basic internal cavity profile of the volute 100, namely curve J, is constructed based on the impeller 300 and the Archimedean spiral. Then, taking the center O of the impeller 300 as the origin, find the point A on the plane where the volute 100 is farthest from the air outlet 400. Connect point O and point A, and extend line OA along the direction of line OA so that line OA and the volute 100 form another intersection point B. Using line AB as the Y-axis, select line CD on the orthographic projection plane of the inner cavity profile of the volute 100, passing through point O and perpendicular to line AB. Points C and D are the intersection points of line CD and the volute 100. Then, after confining the air outlet 400 to the fourth quadrant, at least a portion of the first arc segment 110 is located in the first quadrant of the cross coordinate system. Further, at least a portion of the second arc segment 120 is located in the second and third quadrants of the cross coordinate system. Preferably, at least a portion of the third arc segment 130 is located in the fourth quadrant of the cross coordinate system.

[0047] The present invention also discloses a range hood, which includes the aforementioned fan 10. The specific structure of the fan 10 is as described in the above embodiments. Since the fan 10 adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0048] The fan 10 includes a volute 100, a volute tongue 200, and an impeller 300. The volute tongue 200 is disposed in the volute 100 and forms an air outlet 400 with the volute 100. The impeller 300 is disposed inside the volute 100. The volute 100 has an inner cavity profile surrounding the impeller 300, and the inner cavity profile is biomimetic to an Archimedean spiral. The inner cavity profile includes a first arc segment 110 and a second arc segment 120. The first arc segment 110 and... The second arc segment 120 is connected sequentially from the end where the volute 100 is connected to the volute tongue 200 to the end away from the volute tongue 200; the curvature of the first arc segment 110 is A1, the curvature of the Archimedean spiral corresponding to the first arc segment 110 is B1, and A1 is greater than B1; the curvature of the second arc segment 120 is A2, the curvature of the Archimedean spiral corresponding to the second arc segment 120 is B2, and A2 is not greater than B2.

[0049] The above description is merely an optional embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made using the contents of the present invention's specification and drawings under the inventive concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A fan, comprising a volute, a volute tongue, and an impeller, wherein the volute tongue is disposed in the volute and forms an air outlet with the volute, the impeller is disposed within the volute, and the volute has an inner cavity profile surrounding the impeller, the inner cavity profile being biomimetic to an Archimedean spiral; characterized in that, The inner cavity profile includes a first arc segment and a second arc segment, which are sequentially connected from the end where the volute connects to the volute tongue to the end away from the volute tongue. The curvature of the first arc segment is A1, and the curvature of the Archimedean spiral corresponding to the first arc segment is B1, where A1 is greater than B1. The curvature of the second arc segment is A2, and the curvature of the Archimedean spiral corresponding to the second arc segment is B2, where A2 is not greater than B2. The inner cavity profile also includes a third arc segment, which is connected to the end of the second arc segment away from the first arc segment. The curvature of the third arc segment is A3, and the curvature of the Archimedean spiral corresponding to the third arc segment is B3. A3 is not less than B3. A cross coordinate system is established with the impeller center point O as the origin, the line connecting A and B as the Y-axis, and the line connecting C and D as the X-axis. Point A is the point on the volute farthest from the plane where the air outlet is located. Point B is the intersection of the straight line A0 and the inner cavity profile. C and D are the two intersections of the straight line passing through point O and the inner cavity profile. The air outlet is located in the fourth quadrant of the cross coordinate system. At least a portion of the first arc segment is located in the first quadrant of the cross coordinate system. At least a portion of the second arc segment is located in the second and third quadrants of the cross coordinate system. At least a portion of the third arc segment is located in the fourth quadrant of the cross coordinate system.

2. The fan as described in claim 1, characterized in that, The impeller has a diameter of D; the radius of curvature of the first arc segment is R11, and the radius of curvature of the corresponding segment of the Archimedean spiral to the first arc segment is R12. It satisfies: 0.005≤(R11-R12) / D≤0.

02.

3. The fan as described in claim 1, characterized in that, The impeller has a diameter of D; the radius of curvature of the second arc segment is R21, and the radius of curvature of the corresponding segment of the Archimedean spiral to the second arc segment is R22. It satisfies: 0≤(R22-R21) / D≤0.

05.

4. The fan as described in claim 1, characterized in that, The smooth connection between the first arc segment and the second arc segment; And / or, the second arc segment and the third arc segment are smoothly connected.

5. The fan as described in claim 1, characterized in that, The volute includes a front plate, a back plate, and a surrounding plate. The front plate, the back plate, and the surrounding plate enclose an inner cavity. The impeller and the volute tongue are disposed in the inner cavity. The air outlet communicates with the inner cavity. The surrounding plate surrounds the impeller. The profile of the inner cavity is the profile of the surrounding plate.

6. A range hood, characterized in that, Includes the wind turbine as described in any one of claims 1 to 5.

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