Volute, fan and extractor hood

Abstract

The application discloses a volute, a fan and a range hood, and relates to the technical field of the range hood. The volute is suitable for installing a fan wheel therein, and the volute comprises an air inlet plate. The air inlet plate is provided with an air inlet. The air inlet plate and the fan wheel gradually decrease in distance in the axial direction of the volute along the radial direction of the volute and close to the central axis of the volute. The gap between the air inlet plate and the fan wheel gradually decreases. In this way, the amount of air leakage of the air flow flowing out of the fan wheel in the gap between the air inlet plate and the fan wheel can be reduced, and the performance of the fan is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of range hood, in particular to a volute, a fan and a range hood. BACKGROUND

[0002] The range hood is an important electrical appliance for kitchen fume exhaust, wherein the fan is the core power component of the range hood, which determines the performance index level of the range hood such as air volume, static pressure, noise and efficiency. The fan is composed of a volute, a fan wheel, an air inlet ring and other parts. In the existing scheme, the volute is usually composed of a volute front plate, a volute surrounding plate and a volute rear plate. The volute front plate and / or the volute rear plate is provided with an air inlet, which is also called an air inlet plate. When the fan wheel rotates, the airflow enters the inside of the volute from the air inlet and is discharged from the air outlet of the volute. Part of the airflow spun by the fan wheel will leak from the gap between the air inlet plate and the fan wheel and be sucked into the fan wheel again, which will affect the performance of the fan. SUMMARY

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

[0004] To achieve the above-mentioned purpose, the present application discloses a volute suitable for installing a fan wheel therein, the volute comprising an air inlet plate provided with an air inlet, the distance between the air inlet plate and the fan wheel gradually decreasing along the axial direction of the volute and close to the central axis of the volute.

[0005] In some embodiments of the present application, the air inlet plate is inclined from the side away from the air inlet to the inside of the volute.

[0006] In some embodiments of the present application, the air inlet plate is concave curved from the side away from the air inlet to the inside of the volute.

[0007] In some embodiments of the present application, the volute comprises a surrounding plate, along the axial direction of the volute, one axial side of the surrounding plate is provided with a first end plate and the other axial side is provided with a second end plate, one of the first end plate and the second end plate constitutes the air inlet plate or the first end plate and the second end plate each constitutes the air inlet plate.

[0008] In some embodiments of the present application, the surrounding plate and the first end plate are circularly arc transitioned, and the surrounding plate and the second end plate are circularly arc transitioned.

[0009] In some embodiments of the present application, along the spiral expansion direction of the volute, the bending degree of the circular arc transition part between the surrounding plate and the first end plate gradually decreases, and the bending degree of the circular arc transition part between the surrounding plate and the second end plate gradually decreases.

[0010] In some embodiments of the present application, the arc transition part between the surrounding plate and the first end plate comprises n first transition curves connecting the surrounding plate and the first end plate, the n first transition curves are arranged in sequence along the spiral expanding direction of the volute, and the arc length gradually increases;

[0011] The arc transition part between the surrounding plate and the second end plate comprises n second transition curves connecting the surrounding plate and the second end plate, the n second transition curves are arranged in sequence along the spiral expanding direction of the volute, and the arc length gradually increases.

[0012] In some embodiments of the present application, the radius of curvature of the first transition curve is 3mm-100mm, and the radius of curvature of the second transition curve is 3mm-100mm.

[0013] In some embodiments of the present application, the connecting points of the n first transition curves connecting the first end plate are located in the same plane perpendicular to the central axis of the volute; the connecting points of the n second transition curves connecting the second end plate are located in the same plane perpendicular to the central axis of the volute.

[0014] In some embodiments of the present application, the arc transition part between the surrounding plate and the first end plate, and the arc transition part between the surrounding plate and the second end plate, are mirror symmetric or non-mirror symmetric about the surrounding plate.

[0015] In some embodiments of the present application, the surrounding plate is convex outward relative to the first end plate and the second end plate.

[0016] In some embodiments of the present application, the degree of convexity of the surrounding plate gradually increases along the spiral expanding direction of the volute.

[0017] In some embodiments of the present application, the surrounding plate is convexly curved.

[0018] In some embodiments of the present application, the surrounding plate has n curves connecting the first side and the second side, the n curves are arranged in sequence along the spiral expanding direction of the volute;

[0019] The curve has a first end point Q located at the first side, a second end point W located at the second side, and a third point T located between the first end point Q and the second end point W, 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 along the radial direction of the volute, and the distance between the curve and the central axis of the volute gradually increases from the first end point Q to 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 second end point W to the third point T and the central axis of the volute.

[0020] In some embodiments of the present application, along the axial direction of the volute, the distance between the first end point Q and the second end point W is L, the distance between the first end point Q and the third point T is L1, and the distance between the second end point W and the third point T is L2, and L1>0.3L and L2>0.3L are satisfied.

[0021] In some embodiments of the present application, a virtual plane perpendicular to the central axis of the volute is made through the third point T, and the shroud is mirror-symmetric or non-mirror-symmetric about the virtual plane.

[0022] And / or, the shroud comprises a first shroud and a second shroud arranged along the axial direction of the volute, the first shroud and the second shroud are connected, and the third point T is formed at the intersection of the first shroud and the second shroud.

[0023] In some embodiments of the present application, the circular-arc transition part between the shroud and the first end plate comprises n first transition curves connecting the shroud and the first end plate, and the n first transition curves are sequentially arranged along the spiral expansion direction of the volute.

[0024] The circular-arc transition part between the shroud and the second end plate comprises n second transition curves connecting the shroud and the second end plate, and the n second transition curves are sequentially arranged along the spiral expansion direction of the volute.

[0025] The bending degree of the first transition curve is greater than the bending degree of the curve connected thereto, and the bending degree of the second transition curve is greater than the bending degree of the curve connected thereto.

[0026] In some embodiments of the present application, the shroud comprises a first shroud and a second shroud arranged along the axial direction of the volute, the first shroud and the first end plate are integrally formed, the second shroud and the second end plate are integrally formed, and the first shroud and the second shroud are connected.

[0027] The second aspect of the present application discloses a fan, which comprises the above-mentioned volute.

[0028] A third aspect of the present application discloses an extractor hood, the extractor hood comprising the above-mentioned fan.

[0029] The fan of the technical solution of the present application can realize double-side air inlet, and the distance from the side far from the air inlet to the air inlet and the wind wheel along the axial direction of the volute gradually decreases, so that the amount of leakage of the airflow out of the wind wheel in the gap between the volute and the wind wheel is reduced, and the performance of the fan is improved.

[0030] Other advantages of the present application will be given in part in the following description, will become apparent in part from the following description, or will be learned by practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0031] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below. Obviously, the drawings in the following description only show some embodiments of the present application, and other designs can be obtained by those skilled in the art without creative labor on the basis of the structures shown in the drawings.

[0032] Figure 1 Assembled schematic diagram of volute and wind wheel in some embodiments;

[0033] Figure 2 Assembled schematic diagram of volute and wind wheel in some embodiments; Figure 1 The volute shown in the figure shows the pattern X (see the red part);

[0034] Figure 3 Second assembled schematic diagram of volute and wind wheel in some embodiments;

[0035] Figure 4 Second assembled schematic diagram of volute and wind wheel in some embodiments; Figure 3 The volute shown in the figure shows the pattern Y (see the red part);

[0036] Figure 5 Third assembled schematic diagram of volute and wind wheel in some embodiments;

[0037] Figure 6 Third assembled schematic diagram of volute and wind wheel in some embodiments; Figure 5 Exploded view of the structure shown in the figure;

[0038] Figure 7 Third assembled schematic diagram of volute and wind wheel in some embodiments; Figure 5 Sectional view of the structure shown in the figure;

[0039] Figure 8 Assembled schematic diagram of volute and wind wheel in some embodiments (partially shown in the form of a sectional view);

[0040] Figure 9 Assembled schematic diagram of volute and wind wheel in some embodiments (partially shown in the form of a sectional view); Figure 8 The structure shown in the figure shows the first transition curve and the second transition curve;

[0041] Figure 10 Another volute and impeller matching schematic diagram (partially shown in the form of a sectional view) for some embodiments;

[0042] Figure 11 For Figure 10 The structure shown shows a first transition curve, a second transition curve and a curve;

[0043] Figure 12 For Figure 10 The sectional view of the volute shown.

[0044] BRIEF DESCRIPTION OF DRAWINGS

[0045] Volute 10, first end plate 100, second end plate 200, surrounding plate 300, first surrounding plate 310, second surrounding plate 320, curve 330, first transition curve 410, second transition curve 420, air inlet 510, air outlet 520, impeller 20, first end point Q, second end point W, third point T.

[0046] The implementation, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0047] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0048] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative positional relationship, movement condition, etc. between components in a certain posture (as shown in the drawings), and if the certain posture changes, the directional indications also change accordingly.

[0049] In the present application, unless otherwise explicitly specified and limited, the terms "connection", "fixation" and the like should be understood broadly, for example, "fixation" can be fixed connection, or detachable connection, or integral; can be mechanical connection, or electrical connection; can be direct connection, or indirect connection through an intermediate medium; can be internal connection of two elements or interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0050] In addition, the descriptions such as "first", "second" and the like in the present application are only for the purpose of description, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second" can be explicitly or implicitly included at least one of the features. In addition, the technical solutions of various embodiments can be combined with each other, but it must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or cannot be realized, it should be considered that the combination of technical solutions does not exist, nor within the protection scope required by the present application.

[0051] The first aspect of the present application discloses a volute 10, in some embodiments, in combination with Figures 1 to 9 As shown, the volute 10 is adapted to install the fan wheel 20 therein, the volute 10 includes an air inlet plate, the air inlet plate is provided with an air inlet 510, along the radial direction of the volute 10 and close to the central axis of the volute 10, the distance between the air inlet plate and the fan wheel 20 along the axial direction of the volute 10 gradually decreases (the distance is shown as H in the figure). Figure 8

[0052] In this embodiment, by gradually reducing the distance between the air inlet plate and the fan wheel 20 along the axial direction of the volute 10 from the side away from the air inlet 510 to the air inlet 510 and the fan wheel 20, the amount of air leakage of the air flow out of the fan wheel 20 in the gap between the volute 10 and the fan wheel 20 can be reduced, and the performance of the fan can be improved.

[0053] The fan is described in detail below, which includes a volute 10, a fan wheel 20 and a motor. The volute 10 is a component for gas collection and energy conversion, and is used to install the fan wheel 20 therein. The volute 10 includes an air inlet plate located on the axial side of the fan wheel 20. The air inlet plate is provided with an air inlet 510. The fan wheel 20 is connected with the motor, and the motor drives the fan wheel 20 to rotate. When the fan wheel 20 rotates, the airflow enters the inside of the volute 10 from the air inlet 510 and then is discharged from the air outlet 520 of the volute 10. Part of the airflow spun out by the fan wheel 20 will leak from the gap between the air inlet plate and the fan wheel 20 and be re-sucked into the fan wheel 20. In this embodiment, along the radial direction of the volute 10 and close to the central axis of the volute 10, the distance between the air inlet plate and the fan wheel 20 along the axial direction of the volute 10 gradually decreases (the axial direction of the volute 10 is the axial direction of the fan wheel 20, and the central axis of the volute 10 is the central axis of the fan wheel 20). Under the premise of reducing the influence on the internal space of the volute, the gap between the air inlet plate and the fan wheel 20 can be reduced, that is, the gap gradually decreases along the radial direction of the volute 10 and close to the central axis of the volute 10. In this way, it is helpful to reduce the amount of air leakage of the air flow out of the fan wheel 20 in the gap between the air inlet plate and the fan wheel 20, thereby improving the performance of the fan.

[0054] ​The gradually decreasing distance between the air inlet plate and the fan wheel 20 along the axial direction of the volute 10 can be achieved by the following scheme. In some embodiments, the air inlet plate is inclined from the side away from the air inlet 510 to the inside of the volute 10. Of course, as shown in Figure 8 the air inlet plate can also be concave curved from the side away from the air inlet 510 to the inside of the volute 10. Compared with the former, the latter can further strengthen the structural strength of the air inlet plate and improve the vibration noise of the fan.

[0055] In some embodiments, as shown in Figures 1 to 6 the volute 10 includes a surrounding plate 300. Along the axial direction of the volute 10, the axial side of the surrounding plate 300 is provided with the first end plate 100 and the axial side of the surrounding plate 300 is provided with the second end plate 200. One of the first end plate 100 and the second end plate 200 constitutes the air inlet plate or each constitutes the air inlet plate.

[0056] In the present embodiment, the volute 10 includes the first end plate 100, the second end plate 200 and the 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 mounting the fan wheel 20. In addition, the first end plate 100, the surrounding plate 300 and the second end plate 200 also enclose an air outlet 520 in communication with the receiving cavity. The first end plate 100 is provided with the air inlet 510 or the second end plate 200 is provided with the air inlet 510 or the first end plate 100 and the second end plate 200 are both provided with the air inlet 510. When the first end plate 100 is provided with the air inlet 510, the first end plate 100 constitutes the air inlet plate. When the second end plate 200 is provided with the air inlet 510, the second end plate 200 constitutes the air inlet plate. When the first end plate 100 and the second end plate 200 are both provided with the air inlet 510, the first end plate 100 and the second end plate 200 each constitute the air inlet plate. The fan wheel 20 is connected to the motor. The motor drives the fan wheel 20 to rotate. When the fan wheel 20 rotates, the airflow enters the receiving cavity from the air inlet 510 and is discharged from the air outlet 520. When the first end plate 100 or the second end plate 200 is provided with the air inlet 510, the fan realizes one-sided air inlet. When the first end plate 100 and the second end plate 200 are each provided with the air inlet 510, the fan realizes two-sided air inlet.

[0057] In some embodiments, as shown in Figures 1 to 9 the surrounding plate 300 and the first end plate 100 are arc transitioned. The surrounding plate 300 and the second end plate 200 are arc transitioned.

[0058] 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 application), a rear plate (equivalent to the second end plate 200 or the first end plate 100 in the present application), and a surrounding plate, which is arranged between the front plate and the rear plate. When the wind wheel rotates, the airflow enters the interior of the volute from the air inlet and is discharged from the air outlet. When the airflow flows from the air inlet to the air outlet, vortexes are generated in the included angle space between the front plate and the surrounding plate and in the included angle space between the rear plate and the surrounding plate, resulting in a large flow impact loss.

[0059] To this end, in the present embodiment, the first end plate 100 and the surrounding plate 300 are connected by a circular arc transition, and the second end plate 200 and the surrounding plate 300 are connected by a circular arc transition. The so-called circular arc transition is a smooth transition between two targets through at least one curved surface or curved surface structure, thereby avoiding sharp corners or convex edges. By so arranging, the generation of vortexes in the included angle space between the first end plate 100 and the surrounding plate 300 and in the included angle space between the second end plate 200 and the surrounding plate 300 is inhibited to some extent, thereby reducing flow loss, improving the static pressure recovery capability of the volute 10, and further improving the static pressure and flow efficiency of the fan and reducing noise.

[0060] In some embodiments, in combination with Figure 7 As shown, along the spiral expansion direction of the volute 10, the bending degree of the circular arc transition part between the surrounding plate 300 and the first end plate 100 gradually decreases, and the bending degree of the circular arc transition part between the surrounding plate 300 and the second end plate 200 gradually decreases.

[0061] Along the spiral expansion direction of the volute 10, the flow passage cross section between the surrounding plate 300 and the wind wheel 20 gradually increases, and under the premise that the flow rate of the fan is unchanged, the airflow velocity gradually decreases. Low flow velocity is more likely to generate vortexes in the included angle space between the first end plate 100 and the surrounding plate 300 and in the included angle space between the second end plate 200 and the surrounding plate 300. Therefore, in the present embodiment, along the spiral expansion direction of the volute 10, the bending degree of the circular arc transition part between the surrounding plate 300 and the first end plate 100 gradually decreases, and the bending degree of the circular arc transition part between the surrounding plate 300 and the second end plate 200 gradually decreases. The gradual decrease in the bending degree means that it tends to be flat (still curved), which can further inhibit the formation of vortexes in the included angle space between the surrounding plate 300 and the first end plate 100 and in the included angle space between the surrounding plate 300 and the second end plate 200, thereby further improving the overall performance of the fan.

[0062] Along the spiral expansion direction of the volute 10, the gradual decrease in the bending degree of the circular arc transition part between the surrounding plate 300 and the first end plate 100 can be understood as follows: in combination with Figures 1 to 9As shown in FIG. 1, the arc transition portion between the surrounding plate 300 and the first end plate 100 includes n first transition curves 410 connecting the surrounding plate 300 and the first end plate 100, the n first transition curves 410 are sequentially arranged along the spiral expansion direction of the volute 10, and the radii of curvature gradually increase.

[0063] The arc transition portion between the surrounding plate 300 and the first end plate 100 is indicated as I in FIG. 1, and the first transition curves 410 are lines A11A12 in FIG. 1. Figure 1 Figure 1 The radii of curvature of the n first transition curves 410 are R11, R12, R13, R14, R15…R1n in sequence, which satisfy R11

[0064] Optionally, the radius of curvature of the first transition curve 410 is 3mm-100mm, for example, the radius of curvature of the first transition curve 410 is 3mm, 10mm, 15mm, 25mm, 35mm, 40mm, 45mm, 50mm, 60mm, 70mm, 80mm or 100mm, so that the arc transition portion between the surrounding plate 300 and the first end plate 100 can be manufactured, and the internal flow area of the volute 10 is not excessively reduced compared with a right angle.

[0065] Similarly, along the spiral expansion direction of the volute 10, the bending degree of the arc transition portion between the surrounding plate 300 and the second end plate 200 gradually decreases, which can be understood as follows: in combination with Figures 1 to 9 As shown in FIG. 1, the arc transition portion between the surrounding plate 300 and the second end plate 200 includes n second transition curves 420 connecting the surrounding plate 300 and the second end plate 200, the n second transition curves 420 are sequentially arranged along the spiral expansion direction of the volute 10, and the radii of curvature gradually increase.

[0066] The arc transition portion between the surrounding plate 300 and the second end plate 200 is indicated as II in FIG. 1, and the second transition curves 420 are lines A21A22 in FIG. 1. Figure 3 ​the second transition curve 420 is seen in FIG. 4B. Figure 3 The radii of curvature of the n second transition curves 420 are R21, R22, R23, R24, R25,..., R2n in sequence, satisfying R21

[0067] Optionally, the radius of curvature of the second transition curve 420 is 3 mm to 100 mm, for example, the radius of curvature of the second transition curve 420 is 3 mm, 10 mm, 15 mm, 25 mm, 35 mm, 40 mm, 45 mm, 50 mm, 60 mm, 70 mm, 80 mm, or 100 mm, so as to ensure the manufacturing of the arc transition portion between the surrounding plate 300 and the second end plate 200, avoid too small to cause manufacturing difficulties, and not too much reduce the internal flow area of the volute 10 compared to a right angle.

[0068] In some embodiments, in combination with Figures 1 to 7 As shown in FIG. 4A, the arc transition portion between the surrounding plate 300 and the first end plate 100 includes n first transition curves 410 connecting the surrounding plate 300 and the first end plate 100, the n first transition curves 410 are sequentially arranged along the spiral expansion direction of the volute 10, and the arc length gradually increases.

[0069] As can be seen from the above, along the spiral expansion direction of the volute 10, the bending degree of the arc transition portion between the surrounding plate 300 and the first end plate 100 gradually decreases, based on this, the n first transition curves 410 are sequentially arranged along the spiral expansion direction of the volute 10, and the arc length gradually increases, that is, the bending range of the n first transition curves 410 along the spiral expansion direction of the volute 10 gradually increases, so that the transition of the surrounding plate 300 and the arc transition portion I is smoother, the transition of the first end plate 100 and the arc transition portion I is smoother, and the included angle space between the surrounding plate 300 and the first end plate 100 gradually increases, the flow of low-speed airflow in the arc transition portion I is smoother, further reducing the generation of vortex, and improving the overall performance.

[0070] Optionally, in some embodiments, in combination with Figure 1 and Figure 2 As shown in FIG. 4, the n first transition curves 410 each connect the connection points of the first end plate 100 located in the same plane perpendicular to the central axis of the volute 10, and the connection points of the first transition curves 410 connecting the first end plate 100 are shown in FIG. 4A. Figure 1 When n tends to infinity, the n first transition curves 410 each connecting the connection points of the first end plate 100 form a figure X located in a plane perpendicular to the central axis of the volute 10, which can reduce the manufacturing difficulty of the circular arc transition part I. Since 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, by arranging the n first transition curves 410 each connecting the connection points of the first end plate 100 located in the same plane perpendicular to the central axis of the volute 10, the circular arc transition part I is only gradually expanded towards the position of the surrounding plate 300, without the need to be gradually expanded both towards the position of the first end plate 100 and towards the position of the surrounding plate 300, so that the variable can be better controlled, and the manufacturing difficulty of the volute 10 can be reduced.

[0071] Similarly, in some embodiments, in combination with Figures 1 to 7 As shown in FIG. 4, the n first transition curves 410 each connect the connection points of the first end plate 100 located in the same plane perpendicular to the central axis of the volute 10, and the connection points of the first transition curves 410 connecting the first end plate 100 are shown in FIG. 4A.

[0072] As can be seen from the above, along the spiral expansion direction of the volute 10, the bending degree of the circular arc transition part between the surrounding plate 300 and the second end plate 200 gradually decreases, based on which, 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, that is, the bending range of the n second transition curves 420 along the spiral expansion direction of the volute 10 gradually increases, so that the transition of the surrounding plate 300 and the circular arc transition part II is smoother, the transition of the second end plate 200 and the circular arc transition part II is smoother, and the included angle space between the surrounding plate 300 and the second end plate 200 gradually increases, the flow of low-speed airflow in the circular arc transition part II is smoother, further reducing the generation of vortex, and improving the overall performance.

[0073] Optionally, in some embodiments, in combination with Figure 3 and Figure 4 As shown in FIG. 4, the n first transition curves 410 each connect the connection points of the first end plate 100 located in the same plane perpendicular to the central axis of the volute 10, and the connection points of the first transition curves 410 connecting the first end plate 100 are shown in FIG. 4A. Figure 3When n tends to infinity, the n second transition curves 420 each connect the connecting points of the second end plate 200 to form a figure Y, which is located in a plane perpendicular to the central axis of the volute 10, so as to reduce the manufacturing difficulty of the circular arc transition part II. Since 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, the connecting points of the n second transition curves 420 each connecting the connecting points of the second end plate 200 are located in the same plane perpendicular to the central axis of the volute 10, and the circular arc transition part II is only gradually expanded towards the surrounding plate 300, without the need to be gradually expanded both towards the position where the second end plate 200 is located and towards the position where the surrounding plate 300 is located, so that the variable can be better controlled, and the manufacturing difficulty of the volute 10 is reduced.

[0074] In some embodiments, in combination with Figure 8 and Figure 9 As shown, the circular arc transition part between the surrounding plate 300 and the first end plate 100 is mirror-symmetrically arranged with the circular arc transition part between the surrounding plate 300 and the second end plate 200 about the surrounding plate 300, so as to help reduce the manufacturing difficulty, and the mirror-symmetric arrangement can reduce the vortex generation problem caused by uneven flow, reduce energy loss, and ensure stable operation of the fan.

[0075] Of course, in other embodiments, the circular arc transition part between the surrounding plate 300 and the first end plate 100 can also be non-mirror-symmetrically arranged with the circular arc transition part between the surrounding plate 300 and the second end plate 200 about the surrounding plate 300.

[0076] In some embodiments, in combination with Figure 10 As shown, the back of the surrounding plate 300 facing away from the inside of the volute 10 is convex relative to the first end plate 100 and the second end plate 200.

[0077] In the related art, the airflow flung by the wind wheel hits the shroud, which is easy to form vortex, affecting the performance. Therefore, in the embodiment, the shroud 300 is convex outward relative to the first end plate 100 and the second end plate 200, which is away from the inside of the volute 10. Since the shroud 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 receiving cavity for accommodating the wind wheel 20, the convex outward of the shroud 300 relative to the first end plate 100 and the second end plate 200 can be understood as that the shroud 300 extends from the first end plate 100 and the second end plate 200 towards each other and is convex outward relative to the first end plate 100 and the second end plate 200 away from the central axis of the volute 10, i.e. 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 shroud 300 can enclose a non-rectangular flow cross section (the shroud 300 is convex outward), so that the uniformity of the airflow speed hitting the shroud 300 can be reduced to a certain extent, the static pressure conversion along the axial direction of the volute 10 is more uniform, thereby effectively inhibiting the generation of vortex and improving the performance of the fan.

[0078] In some embodiments, in combination with Figure 10 As shown, the shroud 300 is curved outward, so that the shroud 300 constitutes a curved surface structure, and the distance between the shroud 300 and the wind wheel 20 is gradually changed along the axial direction of the volute 10, further reducing the uniformity of the airflow speed hitting the shroud 300, so that the static pressure conversion is more uniform, further inhibiting the generation of vortex.

[0079] The curved outward of the shroud 300 can be understood as follows: the two sides of the shroud 300 along the axial direction of the volute 10 are respectively a first side and a second side, the shroud 300 has n curved lines 330 connecting the first side and the second side, the curved lines 330 are curved outward, and the n curved lines 330 are arranged in sequence along the spiral expansion direction of the volute 10.

[0080] The curved line 330 has a first end point Q located at the first side, a second end point W located at the second side, and a third point T located between the first end point Q and the second end point W. Along the radial direction of the volute 10, the maximum value of the distance between the curved line 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 curved line 330 and the central axis of the volute 10 gradually increases from the first end point Q to the third point T, and the distance between the curved line 330 and the central axis of the volute 10 gradually increases from the second end point W to the third point T.

[0081] In some embodiments, in combination with Figure 10 and Figure 12As shown, the outward protruding degree of the surrounding plate 300 gradually increases along the spiral expanding direction of the volute 10. It can be understood that the flow cross section between the wind wheel 20 and the surrounding plate 300 gradually increases along the spiral expanding direction of the volute 10, and under the premise that the flow rate of the fan is constant, the air flow rate gradually decreases, and the low flow rate (relatively speaking) air flow impacting the surrounding plate 300 is more likely to generate vortex in the space between the wind wheel 20 and the surrounding plate 300. Therefore, in this embodiment, the outward protruding degree of the surrounding plate 300 gradually increases along the spiral expanding direction of the volute 10, which can further reduce the unevenness of the air flow rate impacting the surrounding plate 300, make the static pressure conversion more uniform, and further inhibit the generation of vortex.

[0082] The spiral expanding direction can be understood as the spiral extension direction of the surrounding plate 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.

[0083] Since the outward protruding degree of the surrounding plate 300 gradually increases along the spiral expanding direction of the volute 10, it means that the bending degree of the surrounding plate 300 gradually increases along the spiral expanding direction of the volute 10. It can be understood as follows: n curves 330 are arranged in sequence along the spiral expanding direction of the volute 10 and the radius of curvature gradually decreases.

[0084] The radius of curvature of the n curves 330 is r1, r2, r3, r4, r5…rn in sequence, which satisfies r1>r2>r3>r4>r5>…>rn. By such arrangement, the radius of curvature of the n curves 330 gradually decreases along the spiral expanding direction of the volute 10, so that the outward protruding degree (bending degree) of the surrounding plate 300 gradually increases, and the gradual change of the surrounding plate 300 along the spiral expanding direction of the volute 10 is more natural, which is more conducive to reducing the formation of vortex. It can be understood that the radius of curvature of the curve 330 refers to the radius of curvature at a certain point of the curve 330, that is, among the adjacent two curves 330, the radius of curvature at any point of the upstream curve 330 along the spiral expanding direction of the volute 10 is greater than the radius of curvature at any point of the downstream curve 330.

[0085] In some embodiments, in combination with Figure 11 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, which satisfies L1>0.3L and L2>0.3L.

[0086] 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 spun by the wind wheel 20 is the fastest at the middle position of the wind wheel 20, and the speed of the airflow spun 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 the 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 almost correspond in the radial direction, the curve 330 shrinks from the most convex part to the two ends, that is, the most convex part of the shroud 300 and the middle position of the wind wheel 20 almost correspond in the radial direction, the shroud 300 shrinks from the most convex part to the first end plate 100 and the second end plate 200, the airflow with a higher speed has a relatively longer flow path from the wind wheel 20 to the shroud 300, and the airflow with a lower speed has a relatively shorter flow path from the wind wheel 20 to the shroud 300. In this way, the shroud 300 better matches the speed of the airflow spun by the wind wheel 20, so that the static pressure conversion of the airflow spun by the wind wheel 20 along the axial direction of the wind wheel 20 is more uniform, and the formation of vortex is more reduced.

[0087] Optionally, when L1=0.5L and L2=0.5L, the most convex part of the shroud 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 fan is better.

[0088] In some embodiments, in combination with Figure 10 and Figure 11 As shown, a virtual plane perpendicular to the central axis of the volute 10 is made through the third point T, and the shroud 300 is mirror-symmetric about the virtual plane. In this way, the manufacturing difficulty is reduced, and the mirror-symmetric arrangement can reduce the vortex generation problem caused by uneven flow, reduce energy loss, and ensure stable operation of the fan.

[0089] Of course, in other embodiments, a virtual plane perpendicular to the central axis of the volute 10 can be made through the third point T, and the shroud 300 is non-mirror-symmetric about the virtual plane.

[0090] In some embodiments, in combination with Figure 10 and Figure 11 As shown, the shroud 300 includes a first shroud 310 and a second shroud 320 arranged along the axial direction of the volute 10, the first shroud 310 and the second shroud 320 are connected, and the third point T is formed at the intersection of the first shroud 310 and the second shroud 320.

[0091] The shroud 300 is tapered from the most outwardly convex portion towards the first end plate 100 and the second end plate 200. In order to facilitate the formation of the shroud 300, the shroud 300 comprises a first shroud 310 and a second shroud 320, which are connected and fixed as a whole to form the shroud 300. The third point T is formed at the intersection of the first shroud 310 and the second shroud 320. The first shroud 310 is proximate to the first end plate 100, and the second shroud 320 is proximate to the second end plate 200. In this way, the first shroud 310 is tapered away from the second shroud 320 towards the first end plate 100, and the second shroud 320 is tapered away from the first shroud 310 towards the second end plate 200, thereby reducing the manufacturing difficulty. It can be understood that there are various connection modes between the first shroud 310 and the second shroud 320, including but not limited to riveting, screwing, welding, and fusing, as long as the first shroud 310 and the second shroud 320 can be fixed together.

[0092] In some embodiments, in combination with Figure 11 As shown, the bending degree of the first transition curve 410 is greater than that of the curve 330 connected thereto, and the bending degree of the second transition curve 420 is greater than that of the curve 330 connected thereto. That is, the radius of curvature of the first transition curve 410 is smaller than that of the curve 330 connected thereto, and the radius of curvature of the second transition curve 420 is smaller than that of the curve 330 connected thereto. In this way, the first end plate 100 and the second end plate 200 are kept at a certain distance to accommodate the wind wheel 20, and the circular arc transition portion between the shroud 300 and the first end plate 100 is more smoothly transitioned, and the circular arc transition portion between the shroud 300 and the second end plate 200 is more smoothly transitioned.

[0093] In some embodiments, in combination with Figures 1 to 12 As shown, the shroud 300 comprises a first shroud 310 and a second shroud 320 arranged along the axial direction of the volute 10. The first shroud 310 is integrally formed with the first end plate 100, the second shroud 320 is integrally formed with the second end plate 200, and the first shroud 310 is connected with the second shroud 320.

[0094] Integrally formed means that it is prepared by an integrally forming process. Taking the integrally formed first shroud 310 and the first end plate 100 as an example, for example, it is prepared by plastic, molten plastic is injected into the mold, and after the molten plastic is formed, the structure of the first shroud 310 and the first end plate 100 combined as a whole is formed, and the circular arc transition between the first shroud 310 and the first end plate 100. Of course, the integrally formed first shroud 310 and the first end plate 100 can also be prepared by metal and processed into an integral structure based on machining processes such as cutting, drilling, stretching, and stamping.

[0095] In the related art, the front plate, the rear plate and the surrounding plate are connected and assembled with each other, and in the embodiment, the first surrounding plate 310 and the first end plate 100 are integrally formed, the second surrounding plate 320 and the second end plate 200 are integrally formed, and the first surrounding plate 310 and the second surrounding plate 320 are connected, which not only reduces the number of parts, but also reduces the number of connection times of assembly, thus helping 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 can be understood that there are many connection methods between the first surrounding plate 310 and the second surrounding plate 320, including but not limited to riveting, screwing, welding, fusion, etc., as long as the first surrounding plate 310 and the second surrounding plate 320 can be fixed together.

[0096] The second aspect of the application discloses a fan, in some embodiments, the fan includes the above-mentioned volute 10, the fan wheel 20 of the fan is installed in the inside of the volute 10, and the volute 10 includes an air inlet plate, the air inlet plate is provided with an air inlet 510, the distance between the air inlet plate and the fan wheel 20 along the axial direction of the volute 10 gradually decreases along the radial direction of the volute 10 and close to the central axis of the volute 10.

[0097] In the embodiment, by gradually reducing the distance between the air inlet plate and the fan wheel 20 along the axial direction of the volute 10 along the radial direction of the volute 10 and close to the central axis of the volute 10, the amount of leakage of the airflow flowing out of the fan wheel 20 in the gap between the volute 10 and the fan wheel 20 can be reduced, and the performance of the fan can be improved. It can be understood that the volute 10 of the fan of the embodiment adopts the technical solutions of the above-mentioned embodiments, and therefore at least has the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here.

[0098] The third aspect of the application discloses an extractor hood, the extractor hood includes the above-mentioned fan, and the fan of the extractor hood of the embodiment adopts the technical solutions of the above-mentioned embodiments, and therefore at least has the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be repeated here.

[0099] The above is only the preferred embodiment of the application, and does not limit the patent scope of the application, and any equivalent structural transformation made under the concept of the application, or direct / indirect application in other related technical fields is included in the patent protection scope of the application.

Claims

1. A volute adapted to receive a wind wheel (20) therein, characterized in that, The volute (10) comprises an inlet baffle provided with an inlet (510), the distance between the inlet baffle and the impeller (20) along the axial direction of the volute (10) gradually decreases along the radial direction of the volute (10) and close to the central axis of the volute (10); The volute (10) comprises a surrounding baffle (300), along the axial direction of the volute (10), the axial one side of the surrounding baffle (300) is provided with a first end plate (100) and the axial other side is provided with a second end plate (200), the first end plate (100) and the second end plate (200) each constitute the inlet baffle; The inlet baffle is concave curved from the side away from the inlet (510) to the inlet (510) towards the inside of the volute (10); The surrounding baffle (300) and the first end plate (100) are circularly arc transitioned, the surrounding baffle (300) and the second end plate (200) are circularly arc transitioned, along the spiral expanding direction of the volute (10), the bending degree of the circular arc transition part between the surrounding baffle (300) and the first end plate (100) gradually decreases, the bending degree of the circular arc transition part between the surrounding baffle (300) and the second end plate (200) gradually decreases; The surrounding baffle (300) is convex relative to the first end plate (100) and the second end plate (200) away from the inside of the volute (10), along the spiral expanding direction of the volute (10), the convex degree of the surrounding baffle (300) gradually increases, and the surrounding baffle (300) is convex curved; The circular arc transition part between the surrounding baffle (300) and the first end plate (100) comprises n first transition curves (410) connecting the surrounding baffle (300) and the first end plate (100), the n first transition curves (410) are sequentially arranged along the spiral expanding direction of the volute (10) and the arc length gradually increases; The circular arc transition part between the surrounding baffle (300) and the second end plate (200) comprises n second transition curves (420) connecting the surrounding baffle (300) and the second end plate (200), the n second transition curves (420) are sequentially arranged along the spiral expanding direction of the volute (10) and the arc length gradually increases.

2. The volute of claim 1, wherein The radius of curvature of the first transition curve (410) is 3mm-100mm, and the radius of curvature of the second transition curve (420) is 3mm-100mm.

3. The volute of claim 1 wherein, The connecting points of the n first transition curves (410) connecting the first end plate (100) are located in the same plane perpendicular to the central axis of the volute (10); the connecting points of the n second transition curves (420) connecting the second end plate (200) are located in the same plane perpendicular to the central axis of the volute (10).

4. The volute of claim 1 wherein, The circular arc transition part between the surrounding baffle (300) and the first end plate (100) and the circular arc transition part between the surrounding baffle (300) and the second end plate (200) are mirror symmetric or non-mirror symmetric about the surrounding baffle (300).

5. The volute of claim 1 wherein, The shroud (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); The curve (330) has a first end point Q located at the first side, a second end point W located at the second side, and a third point T located between the first end point Q and the second end point W. In the radial direction of the volute (10), the maximum 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 end point Q to the third point T. The distance between the curve (330) and the central axis of the volute (10) gradually increases from the second end point W to the third point T.

6. The volute of claim 5 wherein, In the axial direction of the volute (10), the distance between the first end point Q and the second end point W is L, the distance between the first end point Q and the third point T is L1, and the distance between the second end point W and the third point T is L2, which satisfies L1>0.3L and L2>0.3L.

7. The volute of claim 5 wherein, A virtual plane perpendicular to the central axis of the volute (10) passes through the third point T, and the shroud (300) is mirror-symmetric or non-mirror-symmetric about the virtual plane; And / or, the shroud (300) includes a first shroud (310) and a second shroud (320) arranged in the axial direction of the volute (10), the first shroud (310) and the second shroud (320) are connected, and the third point T is formed at the intersection of the first shroud (310) and the second shroud (320).

8. The volute of claim 5 wherein, The circular arc transition part between the shroud (300) and the first end plate (100) includes n first transition curves (410) connecting the shroud (300) and the first end plate (100), and the n first transition curves (410) are arranged in sequence along the spiral expansion direction of the volute (10); The circular arc transition part between the shroud (300) and the second end plate (200) includes n second transition curves (420) connecting the shroud (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); The bending degree of the first transition curve (410) is greater than the bending degree of the curve (330) connected thereto, and the bending degree of the second transition curve (420) is greater than the bending degree of the curve (330) connected thereto.

9. The volute of claim 1 wherein, The surrounding plate (300) comprises a first surrounding plate (310) and a second surrounding plate (320) arranged along the axis of the volute (10), the first surrounding plate (310) is integrally formed with the first end plate (100), the second surrounding plate (320) is integrally formed with the second end plate (200), and the first surrounding plate (310) and the second surrounding plate (320) are connected.

10. A fan, characterized by The fan comprises the volute according to any one of claims 1 to 9.

11. A range hood characterized by, The range hood comprises the fan according to claim 10.

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