Volute, fan and range hood

Abstract

The invention discloses a volute, a fan and a range hood, and relates to the technical field of range hoods. The volute comprises a first end plate, a second end plate and a surrounding plate and is arranged between the first end plate and the second end plate, the surrounding plate protrudes outwards relative to the first end plate and the second end plate in the direction opposite to the interior of the volute, and the outward protruding degree of the surrounding plate is gradually increased in the spiral expansion direction of the volute. According to the technical scheme, the coaming is opposite to the interior of the volute and protrudes outwards relative to the first end plate and the second end plate, the non-uniform degree of the speed of airflow impacting the coaming can be reduced, static pressure conversion is more uniform, vortex generation is effectively restrained, the outward protruding degree of the coaming is gradually increased in the spiral expansion direction of the volute, and therefore the vortex generation efficiency is improved. And under the condition that the flow of the fan is not changed, the non-uniform degree of the airflow speed impacting the coaming can be further reduced, and the performance of the fan is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of range hoods, and in particular to a volute, a fan and a range hood. Background Art

[0002] Range hoods are essential appliances for kitchen exhaust. The fan is the core power component, determining performance indicators such as air volume, static pressure, noise, and efficiency. The fan consists of a volute, impeller, and air inlet ring. In existing designs, the volute typically consists of a front plate (also called an end plate), a volute enclosure, and a rear plate (also called an end plate). The airflow from the impeller striking the volute enclosure can easily form vortices, affecting performance. Summary of the Invention

[0003] The present invention aims to solve one of the technical problems in the related art at least to a certain extent. To this end, the present invention provides a volute.

[0004] To achieve the above object, the present invention discloses a volute, comprising: a first end plate; a second end plate; and The enclosure is arranged between the first end plate and the second end plate, and the enclosure is convex relative to the first end plate and the second end plate with its back facing the interior of the volute, and the convexity of the enclosure gradually increases along the spiral expansion direction of the volute.

[0005] In some embodiments of the present invention, the enclosure is convexly curved.

[0006] In some embodiments of the present invention, the two sides of the enclosing plate along the axial direction of the volute are respectively a first side and a second side, the enclosing plate has n curved lines connecting the first side and the second side, and the n curved lines are arranged sequentially along the spiral expansion direction of the volute; The curve has a first endpoint Q located on the first side, a second endpoint W located on the second side, and a third point T located between the first endpoint Q and the second endpoint W. Along the radial direction of the volute, the maximum distance between the curve and the central axis of the volute is formed between the third point T and the central axis of the volute, and the distance between the curve and the central axis of the volute gradually increases from the first endpoint Q to the third point T, and the distance between the curve and the central axis of the volute gradually increases from the second endpoint W to the third point T.

[0007] In some embodiments of the present invention, along the axial direction of the volute, the distance between the first endpoint Q and the second endpoint W is L, the distance between the first endpoint Q and the third point T is L1, and the distance between the second endpoint W and the third point T is L2, satisfying L1>0.3L, L2>0.3L.

[0008] In some embodiments of the present invention, L1=0.5L and L2=0.5L are satisfied.

[0009] In some embodiments of the present invention, a virtual plane perpendicular to the central axis of the volute is drawn through the third point T, and the enclosure is mirror-symmetrical or non-mirror-symmetrical about the virtual plane.

[0010] In some embodiments of the present invention, the enclosure includes a first enclosure and a second enclosure arranged along the axial direction of the volute, the first enclosure and the second enclosure are connected, and the third point T is formed at the intersection of the first enclosure and the second enclosure.

[0011] In some embodiments of the present invention, there is an arc transition between the enclosure and the first end plate, and there is an arc transition between the enclosure and the second end plate.

[0012] In some embodiments of the present invention, along the spiral expansion direction of the volute, the curvature of the arc transition portion between the enclosure and the first end plate gradually decreases, and the curvature of the arc transition portion between the enclosure and the second end plate gradually decreases.

[0013] In some embodiments of the present invention, the arc transition portion between the shroud and the first end plate includes n first transition curves connecting the shroud and the first end plate, the n first transition curves being sequentially arranged along the spiral expansion direction of the volute, and having gradually increasing arc lengths; The arc transition portion between the enclosure and the second end plate includes n second transition curves connecting the enclosure and the second end plate. The n second transition curves are arranged in sequence along the spiral expansion direction of the volute, and the arc length gradually increases.

[0014] In some embodiments of the present invention, the two sides of the enclosing plate along the axial direction of the volute are respectively a first side and a second side, the enclosing plate has n curves connecting the first side and the second side, the n curves are arranged in sequence along the spiral expansion direction of the volute, the curvature of the first transition curve is greater than the curvature of the curve connected to it, and the curvature of the second transition curve is greater than the curvature of the curve connected to it; And / or, the curvature radius of the first transition curve is 3 mm to 50 mm, and the curvature radius of the second transition curve is 3 mm to 50 mm.

[0015] In some embodiments of the present invention, the connection points where the n first transition curves each connect to the first end plate are located in the same plane perpendicular to the central axis of the volute; the connection points where the n second transition curves each connect to the second end plate are located in the same plane perpendicular to the central axis of the volute.

[0016] In some embodiments of the present invention, the arc transition portion between the enclosure and the first end plate and the arc transition portion between the enclosure and the second end plate are mirror-symmetrical or non-mirror-symmetrical with respect to the enclosure.

[0017] In some embodiments of the present invention, the first end plate and the second end plate are parallel; And / or, the first end plate and the second end plate are respectively provided with an air inlet; And / or, the enclosure includes a first enclosure and a second enclosure arranged along the axial direction of the volute, the first enclosure and the first end plate are integrally formed, the second enclosure and the second end plate are integrally formed, and the first enclosure and the second enclosure are connected.

[0018] A second aspect of the present invention discloses a fan, comprising the volute described above.

[0019] A third aspect of the present invention discloses a range hood, which includes the above-mentioned fan.

[0020] The enclosure of the technical solution of the present invention faces away from the interior of the volute and bulges outward relative to the first end plate and the second end plate, which can reduce the unevenness of the air flow velocity hitting the enclosure, make the static pressure conversion more uniform, and effectively suppress the generation of vortexes. Moreover, along the spiral expansion direction of the volute, the bulge degree of the enclosure gradually increases. When the fan flow rate remains unchanged, the unevenness of the air flow velocity hitting the enclosure can be further reduced, thereby improving the fan performance.

[0021] Other advantages of the present invention will be given in part in the following description, and in part will become obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other designs can be obtained based on the structures shown in these drawings without paying any creative work.

[0023] Figure 1 Schematic diagram of the assembly of the volute and the wind wheel in some embodiments; Figure 2 for Figure 1 The volute shown shows a figure X (see the red part); Figure 3 A second schematic diagram of the assembly of the volute and the wind wheel in some embodiments; Figure 4 for Figure 3 The volute shown shows a figure Y (see the red part); Figure 5 is a third schematic diagram of a volute and a wind wheel assembly in some embodiments; Figure 6 for Figure 5 a cross-sectional view of the structure shown; Figure 7 Schematic diagram of the coordination between the volute and the impeller in some embodiments (partially shown in cross-sectional view); Figure 8 Schematic diagram of the first transition curve, the second transition curve and the curve matching in some embodiments ( Figure 7 The cross section in is considered to be the first transition curve, the second transition curve and the curve); Figure 9 This is an exploded view of the volute in some embodiments.

[0024] Description of Figure Numbers: Volute 10, first end plate 100, second end plate 200, enclosure 300, first enclosure 310, second enclosure 320, curve 330, first transition curve 410, second transition curve 420, air inlet 510, air outlet 520, wind wheel 20, first endpoint Q, second endpoint W, third point T.

[0025] The purpose, features and advantages of the present invention will be further described with reference to the accompanying drawings and in conjunction with the embodiments. DETAILED DESCRIPTION

[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0027] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0028] In the present invention, unless otherwise specified or limited, the terms "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can mean fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two elements or interaction between two elements, unless otherwise specified. Those skilled in the art will be able to understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0029] In addition, in the present invention, descriptions such as "first" and "second" are for descriptive purposes only and should not be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the technical solutions between the various embodiments can be combined with each other, but this must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0030] A first aspect of the present invention discloses a volute 10, which, in some embodiments, is combined with Figure 1 、 Figure 3 、 Figure 5 and Figure 6 As shown, the volute 10 includes a first end plate 100, a second end plate 200 and a surrounding plate 300. The surrounding plate 300 is arranged between the first end plate 100 and the second end plate 200, and the surrounding plate 300 is convex relative to the first end plate 100 and the second end plate 200 with its back to the interior of the volute 10. Along the spiral expansion direction of the volute 10, the convexity of the surrounding plate 300 gradually increases.

[0031] The following is a detailed description of the fan, which includes a volute 10, a wind wheel 20 and a motor. The volute 10 is a component for gas collection and energy conversion, and is used for the wind wheel 20 to be installed therein. In this embodiment, the volute 10 includes a first end plate 100, a second end plate 200 and a surrounding plate 300. The surrounding plate 300 is arranged between the first end plate 100 and the second end plate 200. The first end plate 100, the surrounding plate 300 and the second end plate 200 enclose a receiving cavity for installing the wind wheel 20, and the first end plate 100, the surrounding plate 300 and the second end plate 200 also enclose an air outlet 520 connected to the receiving cavity. The first end plate 100 is provided with an air inlet 510 or the second end plate 200 is provided with an air inlet 510 or the first end plate 100 and the second end plate 200 are both provided with an air inlet 510. The wind wheel 20 is connected to the motor, and the motor drives the wind wheel 20 to rotate. When the wind wheel 20 rotates, the air flow enters the receiving cavity from the air inlet 510 and is discharged from the air outlet 520.

[0032] In the related art, the volute includes a front plate (equivalent to the first end plate 100 or the second end plate 200 in the present invention), a rear plate (equivalent to the second end plate 200 or the first end plate 100 in the present invention) and a surrounding plate. The surrounding plate is arranged between the front plate and the rear plate. The wind wheel, the front plate, the rear plate and the surrounding plate can form a roughly rectangular flow cross-section. When the wind wheel rotates, the airflow thrown out by the wind wheel hits the surrounding plate, which easily forms a vortex and affects the performance.

[0033] To this end, in this embodiment, the enclosing plate 300 is convex relative to the first end plate 100 and the second end plate 200 , facing away from the interior of the volute 10 . Since the enclosure 300 is arranged between the first end plate 100 and the second end plate 200, and cooperates with the first end plate 100 and the second end plate 200 to enclose a accommodating cavity for accommodating the wind wheel 20, the bulge of the enclosure 300 relative to the first end plate 100 and the second end plate 200 can be understood as the enclosure 300 extending toward each other from the first end plate 100 and the second end plate 200 and bulging relative to the first end plate 100 and the second end plate 200 away from the central axis of the volute 10, and the central axis of the volute 10 is the central axis of the wind wheel 20. In this way, the wind wheel 20, the first end plate 100, the second end plate 200 and the enclosure 300 can form a non-rectangular flow cross-section (the enclosure 300 bulges outward), so that the unevenness of the air flow velocity hitting the enclosure 300 can be reduced to a certain extent, so that the static pressure conversion along the axial direction of the volute 10 is more uniform (the axial direction of the volute 10 is equivalent to the axial direction of the wind wheel 20), thereby effectively suppressing the generation of vortexes and improving the performance of the fan.

[0034] On this basis, along the spiral expansion direction of the volute 10, the flow cross-section between the wind wheel 20 and the enclosure 300 gradually increases. Under the premise that the fan flow rate remains unchanged, the air flow velocity will gradually decrease. The low flow rate (relatively speaking) air flow hitting the enclosure 300 is more likely to generate vortices in the space between the wind wheel 20 and the enclosure 300. Therefore, in this embodiment, along the spiral expansion direction of the volute 10, the convexity of the enclosure 300 gradually increases, which can further reduce the unevenness of the air flow velocity hitting the enclosure 300, make the static pressure conversion more uniform, and further suppress the generation of vortices.

[0035] The spiral expansion direction can be understood as the spiral extension direction of the enclosure 300 from one side of the air outlet 520 to the other side of the air outlet 520. One side of the air outlet 520 refers to the side closer to the volute tongue of the volute 10, and the other side is relatively far away from the volute tongue of the volute 10.

[0036] In some embodiments, combined Figure 1 、 Figure 3 、 Figure 5 as well as Figures 6 to 8As shown, the enclosure 300 is convexly curved, so that the enclosure 300 forms a curved surface structure. The distance between the enclosure 300 and the wind wheel 20 is gradually changed along the axial direction of the volute 10, further reducing the unevenness of the air flow velocity hitting the enclosure 300, making the static pressure conversion more uniform, and further suppressing the generation of vortices.

[0037] The convex curvature of the enclosure 300 can be understood as follows: the two axial sides of the enclosure 300 along the volute 10 are respectively the first side and the second side, and the enclosure 300 has n curves 330 connecting the first side and the second side, and the curves 330 are convexly curved, and the n curves 330 are arranged in sequence along the spiral expansion direction of the volute 10.

[0038] The curve 330 has a first endpoint Q located on the first side, a second endpoint W located on the second side, and a third point T located between the first endpoint Q and the second endpoint W. Along the radial direction of the volute 10, the maximum value of the distance between the curve 330 and the central axis of the volute 10 is formed between the third point T and the central axis of the volute 10, and the distance between the curve 330 and the central axis of the volute 10 gradually increases from the first endpoint Q to the third point T, and the distance between the curve 330 and the central axis of the volute 10 gradually increases from the second endpoint W to the third point T.

[0039] Since the convexity of the enclosure 300 gradually increases along the spiral expansion direction of the volute 10, it means that the curvature of the enclosure 300 gradually increases along the spiral expansion direction of the volute 10. It can be understood as follows: n curves 330 are arranged in sequence along the spiral expansion direction of the volute 10 and the curvature radius gradually decreases.

[0040] The curvature radii of the n curves 330 are r1, r2, r3, r4, r5, ..., rn, satisfying r1 > r2 > r3 > r4 > r5 > ... > rn. This arrangement allows the curvature radii of the n curves 330 to gradually decrease along the spiral expansion direction of the volute 10. This gradually increases the convexity (curvature) of the shroud 300, making the gradual change of the shroud 300 along the spiral expansion direction of the volute 10 more natural and more conducive to reducing the formation of vortices. It should be understood that the curvature radius of a curve 330 refers to the curvature radius at a specific point on the curve 330. That is, for two adjacent curves 330, along the spiral expansion direction of the volute 10, the curvature radius at any point on the upstream curve 330 is greater than the curvature radius at any point on the downstream curve 330.

[0041] In some embodiments, combined Figure 7 and Figure 8 As shown, along the axial direction of the volute 10, the distance between the first endpoint Q and the second endpoint W is L, the distance between the first endpoint Q and the third point T is L1, and the distance between the second endpoint W and the third point T is L2, satisfying L1>0.3L, L2>0.3L.

[0042] Specifically, the wind wheel 20 is arranged inside the volute 10. Along the axial direction of the wind wheel 20, the speed of the airflow thrown out from the middle position of the wind wheel 20 is the fastest, and the speed of the airflow thrown out by the wind wheel 20 gradually decreases from the middle position of the wind wheel 20 to the two end positions of the wind wheel 20. In this embodiment, by satisfying L1>0.3L and L2>0.3L, the most convex part of the curve 330 and the middle position of the wind wheel 20 are almost corresponding in the radial direction, and the curve 330 shrinks from the most convex part toward the two ends, that is, the most convex part of the enclosure 300. The enclosure 300 is almost radially corresponding to the middle position of the wind wheel 20, and shrinks from the most convex part toward the first end plate 100 and the second end plate 200. The airflow with higher speed has a relatively longer flow path from the wind wheel 20 to the enclosure 300, and the airflow with lower speed has a relatively shorter flow path from the wind wheel 20 to the enclosure 300. With this arrangement, the enclosure 300 better matches the speed of the airflow thrown out by the wind wheel 20, so that the static pressure conversion of the airflow thrown out by the wind wheel 20 along the axial direction of the wind wheel 20 is more uniform, which is more conducive to reducing the formation of vortices.

[0043] Optionally, when L1=0.5L and L2=0.5L, the most convex part of the enclosure 300 and the middle position of the wind wheel 20 are located on the same plane perpendicular to the central axis of the wind wheel 20, and the overall performance of the wind turbine is better.

[0044] In some embodiments, a virtual plane perpendicular to the central axis of the volute 10 is drawn through the third point T, and the enclosure 300 is mirror-symmetrical about the virtual plane. This helps reduce manufacturing difficulty, and the mirror-symmetrical arrangement can also reduce vortex generation caused by uneven flow, reduce energy loss, and ensure stable operation of the fan.

[0045] Of course, in other embodiments, a virtual plane perpendicular to the central axis of the volute 10 may be drawn through the third point T, and the enclosure 300 may be non-mirror-symmetrical about the virtual plane.

[0046] In some embodiments, combined Figure 1 、 Figure 3 、 Figure 6 and Figure 9 As shown, the enclosure 300 includes a first enclosure 310 and a second enclosure 320 arranged along the axial direction of the volute 10 , the first enclosure 310 and the second enclosure 320 are connected, and the third point T is formed at the intersection of the first enclosure 310 and the second enclosure 320 .

[0047] The enclosure 300 shrinks from its most outwardly convex portion toward the first end plate 100 and the second end plate 200. To facilitate the formation of the enclosure 300, the enclosure 300 includes a first enclosure 310 and a second enclosure 320. The first enclosure 310 and the second enclosure 320 are split components that are connected and fixed to form the enclosure 300. The third point T is formed at the intersection of the first enclosure 310 and the second enclosure 320. The first enclosure 310 is close to the first end plate 100, and the second enclosure 320 is close to the second end plate 200. In this way, the first enclosure 310 gradually shrinks away from the second enclosure 320 toward the first end plate 100, and the second enclosure 320 gradually shrinks away from the first enclosure 310 toward the second end plate 200, thereby reducing manufacturing difficulty. It is understandable that there are various ways to connect the first enclosure 310 and the second enclosure 320, including but not limited to riveting, screwing, welding, welding, etc., as long as the first enclosure 310 and the second enclosure 320 can be fixed to each other.

[0048] In some embodiments, combined Figures 1 to 9 As shown, there is an arc transition between the enclosure 300 and the first end plate 100 , and there is an arc transition between the enclosure 300 and the second end plate 200 .

[0049] In the related art, the volute includes a front plate (equivalent to the first end plate 100 or the second end plate 200 in the present invention), a rear plate (equivalent to the second end plate 200 or the first end plate 100 in the present invention) and a surrounding plate. The surrounding plate is arranged between the front plate and the rear plate. When the wind wheel rotates, the air flow enters the interior of the volute from the air inlet of the volute and is discharged from the air outlet. When the air flow flows from the air inlet to the air outlet, vortices will be generated in the angle space between the front plate and the surrounding plate, as well as in the angle space between the rear plate and the surrounding plate, resulting in a large flow impact loss.

[0050] To this end, in this embodiment, a circular arc transition is formed between the first end plate 100 and the shroud 300, and between the second end plate 200 and the shroud 300. The so-called circular arc transition is achieved by using at least one curved surface or curved surface structure to achieve a smooth transition between the two objects, thereby avoiding sharp corners or convex edges. This arrangement suppresses the generation of vortices in the angle space between the first end plate 100 and the shroud 300, and the angle space between the second end plate 200 and the shroud 300, to a certain extent. This reduces flow losses, improves the static pressure recovery capability of the volute 10, and thus improves the static pressure and flow efficiency of the fan, while reducing noise.

[0051] In some embodiments, combined Figure 6 As shown, along the spiral expansion direction of the volute 10, the curvature of the arc transition portion between the enclosing plate 300 and the first end plate 100 gradually decreases, and the curvature of the arc transition portion between the enclosing plate 300 and the second end plate 200 gradually decreases.

[0052] Along the spiral expansion direction of the volute 10, the flow channel cross-section between the enclosure 300 and the wind wheel 20 gradually increases. Under the premise that the fan flow rate remains unchanged, the air flow velocity will gradually decrease. Low flow velocity is more likely to generate vortices in the angle space between the first end plate 100 and the enclosure 300 and the angle space between the second end plate 200 and the enclosure 300. Therefore, in this embodiment, along the spiral expansion direction of the volute 10, the curvature of the arc transition part between the enclosure 300 and the first end plate 100 gradually decreases, and the curvature of the arc transition part between the enclosure 300 and the second end plate 200 gradually decreases. The gradual decrease in the curvature means that it tends to be flat (still curved), which can further suppress the formation of vortices in the angle space between the enclosure 300 and the first end plate 100 and the angle space between the enclosure 300 and the second end plate 200, thereby further improving the overall performance of the fan.

[0053] Along the spiral expansion direction of the volute 10, the curvature of the arc transition portion between the shroud 300 and the first end plate 100 gradually decreases, which can be understood as follows: Figures 1 to 6 As shown, the arc transition portion between the enclosure 300 and the first end plate 100 includes n first transition curves 410 connecting the enclosure 300 and the first end plate 100. The n first transition curves 410 are arranged in sequence along the spiral expansion direction of the volute 10, and the curvature radius gradually increases.

[0054] The arc transition portion between the enclosure 300 and the first end plate 100 is shown in FIG. Figure 1 The first transition curve 410 is shown in the mark I in FIG. Figure 1 The lines A11A12 in the figure, the curvature radii of the n first transition curves 410 are R11, R12, R13, R14, R15…R1n, satisfying R11<R12<R13<R14<R15<…<R1n. Through such an arrangement, the curvature radius of each of the n first transition curves 410 gradually increases along the spiral expansion direction of the volute 10, so that the curvature degree of the arc transition part between the shroud 300 and the first end plate 100 gradually becomes smaller, and the gradual change of the arc transition part between the shroud 300 and the first end plate 100 along the spiral expansion direction of the volute 10 becomes more natural, which is more conducive to reducing the formation of vortexes in the angle space between the shroud 300 and the first end plate 100. It can be understood that the curvature radius of the first transition curve 410 refers to the curvature radius at a certain point on the first transition curve 410, that is, in the two adjacent first transition curves 410, along the spiral expansion direction of the volute 10, the curvature radius at any point on the upstream side of the first transition curve 410 is smaller than the curvature radius at any point on the downstream side of the first transition curve 410.

[0055] Optionally, the curvature radius of the first transition curve 410 is 3mm~50mm, for example, the curvature radius of the first transition curve 410 is 3mm, 10mm, 15mm, 25mm, 35mm, 40mm, 45mm or 50mm. In this way, the manufacture of the arc transition part between the enclosure 300 and the first end plate 100 can be ensured, avoiding manufacturing difficulties caused by being too small, and the internal flow area of ​​the volute 10 will not be reduced too much compared to a right angle.

[0056] Similarly, along the spiral expansion direction of the volute 10, the curvature of the arc transition portion between the shroud 300 and the second end plate 200 gradually decreases, which can be understood as follows: Figures 1 to 6 As shown, the arc transition portion between the enclosure 300 and the second end plate 200 includes n second transition curves 420 connecting the enclosure 300 and the second end plate 200. The n second transition curves 420 are arranged in sequence along the spiral expansion direction of the volute 10, and the curvature radius gradually increases.

[0057] The arc transition portion between the enclosure 300 and the second end plate 200 is shown in FIG. Figure 3 Mark II in the figure, the second transition curve 420 is shown in FIG. Figure 3 The lines A21A22 in the figure, the curvature radii of the n second transition curves 420 are R21, R22, R23, R24, R25…R2n, satisfying R21<R22<R23<R24<R25<…<R2n. Through such an arrangement, the curvature radius of each of the n second transition curves 420 gradually increases along the spiral expansion direction of the volute 10, so that the curvature degree of the arc transition part between the shroud 300 and the second end plate 200 gradually becomes smaller, and the gradual change of the arc transition part between the shroud 300 and the second end plate 200 along the spiral expansion direction of the volute 10 becomes more natural, which is more conducive to reducing the formation of vortexes in the angle space between the shroud 300 and the second end plate 200. It can be understood that the curvature radius of the second transition curve 420 refers to the curvature radius at a certain point on the second transition curve 420, that is, in the two adjacent second transition curves 420, along the spiral expansion direction of the volute 10, the curvature radius at any point on the upstream side of the second transition curve 420 is smaller than the curvature radius at any point on the downstream side of the second transition curve 420.

[0058] Optionally, the curvature radius of the second transition curve 420 is 3mm~50mm, for example, the curvature radius of the second transition curve 420 is 3mm, 10mm, 15mm, 25mm, 35mm, 40mm, 45mm or 50mm. In this way, the manufacture of the arc transition part between the enclosure 300 and the second end plate 200 can be ensured, avoiding manufacturing difficulties caused by being too small, and the internal flow area of ​​the volute 10 will not be reduced too much compared to a right angle.

[0059] In some embodiments, combined Figures 1 to 6 As shown, the arc transition portion between the enclosure 300 and the first end plate 100 includes n first transition curves 410 connecting the enclosure 300 and the first end plate 100. The n first transition curves 410 are arranged in sequence along the spiral expansion direction of the volute 10, and the arc length gradually increases.

[0060] As can be seen from the above, along the spiral expansion direction of the volute 10, the curvature of the arc transition portion between the enclosure 300 and the first end plate 100 gradually decreases. Based on this, n first transition curves 410 are arranged in sequence along the spiral expansion direction of the volute 10, and the arc length gradually increases, that is, the curvature range of the n first transition curves 410 along the spiral expansion direction of the volute 10 gradually becomes larger, so that the transition between the enclosure 300 and the arc transition portion I is smoother, the transition between the first end plate 100 and the arc transition portion I is smoother, and the angle space between the enclosure 300 and the first end plate 100 is gradually increased, and the low-speed airflow flows more smoothly in the arc transition portion I, further reducing the generation of vortices and improving the overall performance.

[0061] Optionally, in some embodiments, combined Figure 1 and Figure 2 As shown, the connection points of the n first transition curves 410 connected to the first end plate 100 are located in the same plane perpendicular to the central axis of the volute 10. The connection points of the first transition curves 410 connected to the first end plate 100 are shown in FIG. Figure 1 At point A12 in the figure, when n approaches infinity, the connection points of the n first transition curves 410, each connecting to the first end plate 100, form a figure X. This figure X lies on a plane perpendicular to the central axis of the volute 10. This reduces the difficulty in manufacturing the arc transition portion I. Because the n first transition curves 410 are arranged sequentially along the spiral expansion direction of the volute 10 and their arc lengths gradually increase, and because the connection points of the n first transition curves 410, each connecting to the first end plate 100, lie on the same plane perpendicular to the central axis of the volute 10, the arc transition portion I is formed by gradually expanding only toward the shroud 300, without having to gradually expand toward both the first end plate 100 and the shroud 300. This allows for better control of variables and reduces the difficulty in manufacturing the volute 10.

[0062] Similarly, in some embodiments, combined with Figure 6 As shown, the arc transition portion between the enclosure 300 and the second end plate 200 includes n second transition curves 420 connecting the enclosure 300 and the second end plate 200. The n second transition curves 420 are arranged in sequence along the spiral expansion direction of the volute 10, and the arc length gradually increases.

[0063] As can be seen from the above, along the spiral expansion direction of the volute 10, the curvature of the arc transition part between the enclosure 300 and the second end plate 200 gradually becomes smaller. Based on this, n second transition curves 420 are arranged in sequence along the spiral expansion direction of the volute 10, and the arc length gradually increases, that is, the curvature range of the n second transition curves 420 along the spiral expansion direction of the volute 10 gradually becomes larger, so that the transition between the enclosure 300 and the arc transition part II is smoother, the transition between the second end plate 200 and the arc transition part II is smoother, and the angle space between the enclosure 300 and the second end plate 200 is gradually increased, and the low-speed airflow flows more smoothly in the arc transition part II, further reducing the generation of vortices and improving the overall performance.

[0064] Optionally, in some embodiments, combined Figure 3 and Figure 4 As shown, the connection points of the n second transition curves 420 connected to the second end plate 200 are located in the same plane perpendicular to the central axis of the volute 10, and the connection points of the second transition curves 420 connected to the second end plate 200 are shown in FIG. Figure 3 At point A22 in the figure, when n approaches infinity, the connection points of the n second transition curves 420 each connecting to the second end plate 200 form a figure Y, which is located in a plane perpendicular to the central axis of the volute 10. This can reduce the difficulty of manufacturing the arc transition portion II. Because the n second transition curves 420 are arranged sequentially along the spiral expansion direction of the volute 10 and the arc length gradually increases, the connection points of the n second transition curves 420 each connecting to the second end plate 200 are located in the same plane perpendicular to the central axis of the volute 10. The arc transition portion II is formed by gradually expanding only toward the surrounding plate 300, without having to gradually expand toward both the position of the second end plate 200 and the position of the surrounding plate 300. This can better control the variables and reduce the difficulty of manufacturing the volute 10.

[0065] In some embodiments, combined Figure 6As shown, the shroud 300 has a first side and a second side along the axial direction of the volute 10, respectively. The shroud 300 has n curves 330 connecting the first side and the second side. The n curves 330 are arranged sequentially along the spiral expansion direction of the volute 10. The curvature of the first transition curve 410 is greater than the curvature of the curve 330 connected to it, and the curvature of the second transition curve 420 is greater than the curvature of the curve 330 connected to it. In other words, the radius of curvature of the first transition curve 410 is smaller than the curvature of the curve 330 connected to it, and the radius of curvature of the second transition curve 420 is smaller than the curvature of the curve 330 connected to it. This allows the first end plate 100 and the second end plate 200 to be separated by a certain distance to accommodate the wind rotor 20, and also makes the transition between the arc transition portion between the shroud 300 and the first end plate 100 and the shroud 300 smoother, and the transition between the arc transition portion between the shroud 300 and the second end plate 200 and the shroud 300 smoother.

[0066] In some embodiments, combined Figure 7 As shown, the arc transition portion between the enclosure 300 and the first end plate 100 and the arc transition portion between the enclosure 300 and the second end plate 200 are mirror-symmetrical about the enclosure 300, which helps to reduce the manufacturing difficulty. The mirror-symmetrical setting can also reduce the vortex generation problem caused by uneven flow, reduce energy loss, and ensure the stable operation of the fan.

[0067] Of course, in other embodiments, the arc transition portion between the enclosure 300 and the first end plate 100 and the arc transition portion between the enclosure 300 and the second end plate 200 may be non-mirror-symmetrical about the enclosure 300.

[0068] In some embodiments, combined Figure 7 As shown, the first end plate 100 and the second end plate 200 are parallel, so that the volute 10 has an equal thickness design. On the basis of the equal thickness design of the volute 10, the performance of the fan is improved by improving the arc transition between the first end plate 100 and the surrounding plate 300, the arc transition between the second end plate 200 and the surrounding plate 300, and the convexity of the surrounding plate 300.

[0069] In some embodiments, combined Figures 1 to 9 As shown, the first end plate 100 and the second end plate 200 are respectively provided with an air inlet 510 , so that the wind wheel 20 can achieve air intake on both sides of the axial direction.

[0070] In some embodiments, combined Figure 9 As shown, the enclosure 300 includes a first enclosure 310 and a second enclosure 320 arranged along the axial direction of the volute 10, the first enclosure 310 and the first end plate 100 are integrally formed, the second enclosure 320 and the second end plate 200 are integrally formed, and the first enclosure 310 and the second enclosure 320 are connected.

[0071] Integrally formed means produced through an integrated molding process. For example, the integrated molding of the first enclosure 310 and the first end plate 100 is described. For example, if they are made of plastic, molten plastic is injected into a mold. Once the molten plastic is formed, the first enclosure 310 and the first end plate 100 are formed into an integrated structure, with a circular arc transition between the first enclosure 310 and the first end plate 100. Of course, the integrated molding between the first enclosure 310 and the first end plate 100 can also be produced from metal and processed into an integrated structure using machining processes such as cutting, drilling, stretching, and stamping.

[0072] In the related art, the front plate, the rear plate, and the enclosure are required to be connected and assembled with each other. In this embodiment, the first enclosure 310 and the first end plate 100 are integrally formed, and the second enclosure 320 and the second end plate 200 are integrally formed. The first enclosure 310 and the second enclosure 320 are connected, which not only reduces the number of parts, but also reduces the number of assembly connections. This helps to simplify the structure of the volute 10, improve the manufacturing convenience of the volute 10, and also improve the overall structural strength of the volute 10. It is understandable that there are many ways to connect the first enclosure 310 and the second enclosure 320, including but not limited to riveting, screwing, welding, welding, etc., as long as the first enclosure 310 and the second enclosure 320 can be fixed to each other.

[0073] The second aspect of the present invention discloses a fan. In some embodiments, the fan includes the above-mentioned volute 10, the fan wheel 20 is arranged in the volute 10, the fan motor and the fan wheel 20 are connected, the volute 10 includes a first end plate 100, a second end plate 200 and a surrounding plate 300, the surrounding plate 300 is arranged between the first end plate 100 and the second end plate 200, and the surrounding plate 300 is convex relative to the first end plate 100 and the second end plate 200 with its back to the interior of the volute 10, and the convexity of the surrounding plate 300 gradually increases along the spiral expansion direction of the volute 10. The enclosure 300 of this embodiment, facing away from the interior of the volute 10, bulges outward relative to the first end plate 100 and the second end plate 200, which can reduce the unevenness of the airflow velocity hitting the enclosure 300, make the static pressure conversion more uniform, and effectively suppress the generation of vortices. In addition, along the spiral expansion direction of the volute 10, the degree of bulging of the enclosure 300 gradually increases. Under the condition that the fan flow rate remains unchanged, the unevenness of the airflow velocity hitting the enclosure 300 can be further reduced, the static pressure conversion is more uniform, and the fan performance is improved. It can be understood that the volute 10 of the fan of this embodiment adopts the technical solution of the above-mentioned embodiment, and therefore has at least the beneficial effects brought by the technical solution of the above-mentioned embodiment, which will not be repeated here.

[0074] The third aspect of the present invention discloses a range hood. In some embodiments, the range hood includes the above-mentioned fan. The fan of the range hood of this embodiment adopts the technical solution of the above-mentioned embodiment, and therefore has at least the beneficial effects brought by the technical solution of the above-mentioned embodiment, which will not be repeated here.

[0075] The above are only preferred embodiments of the present invention and are not intended to limit the patent scope of the present invention. All equivalent structural transformations made based on the contents of the present invention's description and drawings, or direct / indirect applications in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A volute, characterized in that: The volute (10) comprises: a first end plate (100); a second end plate (200); and A surrounding plate (300) is provided between the first end plate (100) and the second end plate (200), and the surrounding plate (300) is convex relative to the first end plate (100) and the second end plate (200) with its back facing the interior of the volute (10), and along the spiral expansion direction of the volute (10), the convexity of the surrounding plate (300) gradually increases, the surrounding plate (300) is convex and curved, and a circular arc transition is formed between the surrounding plate (300) and the first end plate (100), and a circular arc transition is formed between the surrounding plate (300) and the second end plate (200).

2. The volute according to claim 1, wherein: The enclosing plate (300) has two axial sides of the volute (10) that are respectively a first side and a second side, and the enclosing plate (300) has n curved lines (330) connecting the first side and the second side, and the n curved lines (330) are arranged in sequence along the spiral expansion direction of the volute (10); The curve (330) has a first endpoint Q located on the first side, a second endpoint W located on the second side, and a third point T located between the first endpoint Q and the second endpoint W. Along the radial direction of the volute (10), the maximum value of the distance between the curve (330) and the central axis of the volute (10) is formed between the third point T and the central axis of the volute (10), and the distance between the curve (330) and the central axis of the volute (10) gradually increases from the first endpoint Q to the third point T, and the distance between the curve (330) and the central axis of the volute (10) gradually increases from the second endpoint W to the third point T.

3. The volute according to claim 2, wherein: Along the axial direction of the volute (10), the distance between the first endpoint Q and the second endpoint W is L, the distance between the first endpoint Q and the third point T is L1, and the distance between the second endpoint W and the third point T is L2, satisfying L1>0.3L and L2>0.3L.

4. The volute according to claim 3, wherein: Satisfy L1=0.5L, L2=0.5L.

5. The volute according to claim 3, wherein: A virtual plane perpendicular to the central axis of the volute (10) is drawn through the third point T, and the enclosure (300) is mirror-symmetrical or non-mirror-symmetrical about the virtual plane.

6. The volute according to claim 3, wherein: The enclosure (300) includes a first enclosure (310) and a second enclosure (320) arranged along the axial direction of the volute (10), the first enclosure (310) and the second enclosure (320) are connected, and the third point T is formed at the intersection of the first enclosure (310) and the second enclosure (320).

7. The volute according to claim 1, wherein: Along the spiral expansion direction of the volute (10), the curvature of the arc transition portion between the enclosure (300) and the first end plate (100) gradually decreases, and the curvature of the arc transition portion between the enclosure (300) and the second end plate (200) gradually decreases.

8. The volute according to claim 7, wherein: The arc transition portion between the enclosing plate (300) and the first end plate (100) comprises n first transition curves (410) connecting the enclosing plate (300) and the first end plate (100), wherein the n first transition curves (410) are sequentially arranged along the spiral expansion direction of the volute (10), and the arc lengths gradually increase; The arc transition portion between the enclosure (300) and the second end plate (200) includes n second transition curves (420) connecting the enclosure (300) and the second end plate (200), and the n second transition curves (420) are arranged in sequence along the spiral expansion direction of the volute (10), and the arc length gradually increases.

9. The volute according to claim 8, wherein: The enclosing plate (300) has two axial sides of the volute (10) that are respectively a first side and a second side, and the enclosing plate (300) has n curves (330) connecting the first side and the second side, and the n curves (330) are arranged in sequence along the spiral expansion direction of the volute (10), and the curvature of the first transition curve (410) is greater than the curvature of the curve (330) connected thereto, and the curvature of the second transition curve (420) is greater than the curvature of the curve (330) connected thereto; And / or, the curvature radius of the first transition curve (410) is 3 mm to 50 mm, and the curvature radius of the second transition curve (420) is 3 mm to 50 mm.

10. The volute according to claim 8, wherein: The connection points of the n first transition curves (410) each connecting to the first end plate (100) are located in the same plane perpendicular to the central axis of the volute (10); the connection points of the n second transition curves (420) each connecting to the second end plate (200) are located in the same plane perpendicular to the central axis of the volute (10).

11. The volute according to claim 1, wherein: The arc transition portion between the enclosure (300) and the first end plate (100) and the arc transition portion between the enclosure (300) and the second end plate (200) are mirror-symmetrical or non-mirror-symmetrical with respect to the enclosure (300).

12. The volute according to any one of claims 1 to 11, characterized in that: The first end plate (100) and the second end plate (200) are parallel; And / or, the first end plate (100) and the second end plate (200) are respectively provided with an air inlet (510); And / or, the enclosure (300) includes a first enclosure (310) and a second enclosure (320) arranged along the axial direction of the volute (10), the first enclosure (310) and the first end plate (100) are integrally formed, the second enclosure (320) and the second end plate (200) are integrally formed, and the first enclosure (310) and the second enclosure (320) are connected.

13. A fan, characterized in that: The fan comprises the volute according to any one of claims 1 to 12.

14. A range hood, characterized in that: The range hood includes the fan according to claim 13.

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