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 comprises a first end plate, a second end plate and a surrounding plate, is arranged between the first end plate and the second end plate, and is outwardly convex relative to the first end plate and the second end plate in a direction away from the interior of the volute. The outward convex degree of the surrounding plate gradually increases along the spiral expanding direction of the volute. According to the technical scheme of the application, the surrounding plate is outwardly convex relative to the first end plate and the second end plate in a direction away from the interior of the volute, the non-uniform degree of the airflow velocity impacting the surrounding plate is reduced, the static pressure conversion is more uniform, the generation of vortex is effectively inhibited, and the outward convex degree of the surrounding plate gradually increases along the spiral expanding direction of the volute. In the case that the flow rate of the fan is unchanged, the non-uniform degree of the airflow velocity impacting the surrounding plate is further 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 electric 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 wind wheel and an air inlet ring, in the existing scheme, the volute is usually composed of a volute front plate (also referred to as an end plate), a volute surrounding plate and a volute rear plate (also referred to as an end plate), the airflow flung by the wind wheel is easy to form vortex when impacting the volute surrounding plate, which affects the performance index. 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, which comprises:

[0005] a first end plate;

[0006] a second end plate; and

[0007] a surrounding plate arranged between the first end plate and the second end plate, and the surrounding plate is convex outward relative to the first end plate and the second end plate in a direction away from the inside of the volute, and the degree of convexity of the surrounding plate gradually increases along the spiral expansion direction of the volute.

[0008] In some embodiments of the present application, the surrounding plate is curved outward.

[0009] In some embodiments of the present application, the surrounding plate has a first side and a second side on both sides of the axial direction of the volute, and the surrounding plate has n curves connecting the first side and the second side, and the n curves are arranged in sequence along the spiral expansion direction of the volute.

[0010] The curve has a first end point Q located on the first side, a second end point W located on the second side and a third point T located between the first end point Q and the second end point W, and 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 distance between the curve and the central axis of the volute gradually increases from the second end point W to the third point T.

[0011] 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, satisfying L1>0.3L and L2>0.3L.

[0012] In some embodiments of the present application, L1=0.5L and L2=0.5L are satisfied.

[0013] 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-symmetrical or non-mirror-symmetrical about the virtual plane.

[0014] 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 second shroud are connected, and the third point T is formed at the intersection of the first shroud and the second shroud.

[0015] In some embodiments of the present application, the shroud and the first end plate are connected by a circular arc transition, and the shroud and the second end plate are connected by a circular arc transition.

[0016] 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 shroud and the first end plate gradually decreases, and the bending degree of the circular arc transition part between the shroud and the second end plate gradually decreases.

[0017] 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, the n first transition curves are sequentially arranged along the spiral expansion direction of the volute, and the arc length gradually increases;

[0018] 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, the n second transition curves are sequentially arranged along the spiral expansion direction of the volute, and the arc length gradually increases.

[0019] In some embodiments of the present application, the shroud has a first side and a second side on both sides along the axial direction of the volute, the shroud has n curves connecting the first side and the second side, the n curves are sequentially arranged along the spiral expansion direction of the volute, 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.

[0020] And / or, the first transition curve has a radius of curvature of 3mm-50mm, and the second transition curve has a radius of curvature of 3mm-50mm.

[0021] 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, and 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.

[0022] In some embodiments of the present application, the circular arc transition part between the surrounding plate and the first end plate is mirror-symmetric or non-mirror-symmetric with the circular arc transition part between the surrounding plate and the second end plate with respect to the surrounding plate.

[0023] In some embodiments of the present application, the first end plate and the second end plate are parallel to each other.

[0024] And / or, the first end plate and the second end plate are respectively provided with air inlets.

[0025] And / or, the surrounding plate comprises a first surrounding plate and a second surrounding plate arranged along the axial direction of the volute, the first surrounding plate and the first end plate are integrally formed, the second surrounding plate and the second end plate are integrally formed, and the first surrounding plate and the second surrounding plate are connected.

[0026] The second aspect of the present application discloses a fan, which comprises the above-mentioned volute.

[0027] The third aspect of the present application discloses an extractor hood, which comprises the above-mentioned fan.

[0028] The surrounding plate of the technical scheme of the present application is convex outward with respect to the first end plate and the second end plate and away from the inside of the volute, which can reduce the non-uniformity of the airflow velocity impacting the surrounding plate, make the static pressure conversion more uniform, effectively inhibit the generation of vortex, and gradually increase the convex degree of the surrounding plate along the spiral expansion direction of the volute, further reduce the non-uniformity of the airflow velocity impacting the surrounding plate in the case of constant flow of the fan, and improve the performance of the fan.

[0029] 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

[0030] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other designs can be obtained based on the structures shown in these drawings without creative effort.

[0031] Figure 1 This is a schematic diagram of the assembly of the volute and the impeller in some embodiments;

[0032] Figure 2 for Figure 1 The volute shown illustrates graphic X (see red portion);

[0033] Figure 3 This is a second schematic diagram of the assembly of the volute and the impeller in some embodiments;

[0034] Figure 4 for Figure 3 The volute shown illustrates the figure Y (see red portion);

[0035] Figure 5 This is a third schematic diagram of the volute and impeller assembly in some embodiments;

[0036] Figure 6 for Figure 5 A cross-sectional view of the structure shown;

[0037] Figure 7 A schematic diagram of the engagement between the volute and the impeller in some embodiments (partially shown in cross-sectional view);

[0038] Figure 8 This is a schematic diagram of the first transition curve, the second transition curve, and the curve mating in some embodiments (showing...). Figure 7 The cross section in the middle is considered as the first transition curve, the second transition curve, and the curve.

[0039] Figure 9 An exploded view of the volute in some embodiments.

[0040] Explanation of icon numbers:

[0041] 10 volute, 100 first end plate, 200 second end plate, 300 surrounding plate, 310 first surrounding plate, 320 second surrounding plate, 330 curve, 410 first transition curve, 420 second transition curve, 510 air inlet, 520 air outlet, 20 impeller, Q first end point, W second end point, T third point.

[0042] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0043] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative effort belong to the scope of protection of the present application.

[0044] It should be noted that all the directionality indications (such as up, down, left, right, front, back, and the like) in the embodiments of the present application are only used to explain the relative position relationship, movement condition and the like between components in a certain specific posture (as shown in the drawings), and if the specific posture changes, the directionality indications also change accordingly.

[0045] In the present application, unless otherwise explicitly specified and limited, the terms “connection”, “fixation” and the like should be understood in a broad sense, 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 the internal connection of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For a person of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0046] In addition, the description such as “first”, “second” and the like in the present application is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by “first”, “second” can explicitly or implicitly include at least one of the features. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the fact that a person of ordinary skill in the art can realize it, and when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, and is not within the scope of protection claimed by the present application.

[0047] A first aspect of the present application discloses a volute 10, in some embodiments, in combination 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 outward relative to the first end plate 100 and the second end plate 200 away from the inside of the volute 10, and the degree of convexity of the surrounding plate 300 gradually increases along the spiral expansion direction of the volute 10.

[0048] The fan includes a volute 10, an impeller 20 and a motor. The volute 10 is a component for gas collection and energy conversion, and is used for mounting the impeller 20 therein. In the 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 mounting the impeller 20. The first end plate 100, the surrounding plate 300 and the second end plate 200 further enclose an air outlet 520 in communication with the receiving cavity. The first end plate 100 is provided with an air inlet 510, or the second end plate 200 is provided with the air inlet 510, or both the first end plate 100 and the second end plate 200 are provided with the air inlet 510. The impeller 20 is connected to the motor. The motor drives the impeller 20 to rotate. When the impeller 20 rotates, the airflow enters the receiving cavity from the air inlet 510 and is discharged from the air outlet 520.

[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 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. The surrounding plate is arranged between the front plate and the rear plate. The impeller, the front plate, the rear plate and the surrounding plate can enclose a flow cross section substantially in a rectangular shape. When the impeller rotates, the airflow thrown by the impeller hits the surrounding plate, which is easy to form vortex, affecting the performance.

[0050] Therefore, in the embodiment, the surrounding plate 300 is outwardly convex with respect to the first end plate 100 and the second end plate 200, away from the inside of the volute 10. Since the surrounding plate 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 the receiving cavity for accommodating the impeller 20, the outward convexity of the surrounding plate 300 with respect to the first end plate 100 and the second end plate 200 can be understood as that the surrounding plate 300 extends from the first end plate 100 and the second end plate 200 towards each other and away from the central axis of the volute 10 with respect to the first end plate 100 and the second end plate 200. The central axis of the volute 10 is the central axis of the impeller 20. In this way, the impeller 20, the first end plate 100, the second end plate 200 and the surrounding plate 300 can enclose a non-rectangular flow cross section (the outward convexity of the surrounding plate 300). In this way, the uniformity of the airflow speed hitting the surrounding plate 300 can be reduced to a certain extent, the static pressure conversion along the axial direction of the volute 10 (the axial direction of the volute 10 is equivalent to the axial direction of the impeller 20) is more uniform, and thus the generation of vortex is effectively inhibited, and the performance of the fan is improved.

[0051] On this basis, along the spiral expanding direction of the volute 10, the flow cross section between the wind wheel 20 and the surrounding plate 300 gradually increases, and under the premise that the flow rate of the fan is unchanged, the air flow rate gradually decreases. The low flow rate (relatively speaking) of the air flow hitting 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 the embodiment, the degree of outward convexity of the surrounding plate 300 gradually increases along the spiral expanding direction of the volute 10. In this way, the degree of non-uniformity of the air flow rate hitting the surrounding plate 300 can be further reduced, the conversion of static pressure is more uniform, and the generation of vortex is further inhibited.

[0052] 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.

[0053] In some embodiments, in combination with Figure 1 , Figure 3 , Figure 5 and Figure 6 to Figure 8 , the surrounding plate 300 is outwardly convexly curved. In this way, the surrounding plate 300 forms a curved surface structure, and the distance between the surrounding plate 300 and the wind wheel 20 gradually changes along the axial direction of the volute 10. The degree of non-uniformity of the air flow rate hitting the surrounding plate 300 is further reduced, the conversion of static pressure is more uniform, and the generation of vortex is further inhibited.

[0054] The outward convex curvature of the surrounding plate 300 can be understood as follows: the two sides of the surrounding plate 300 along the axial direction of the volute 10 are respectively a first side and a second side. The surrounding plate 300 has n curved lines 330 connecting the first side and the second side. The curved lines 330 are outwardly convexly curved, and the n curved lines 330 are arranged in sequence along the spiral expanding direction of the volute 10.

[0055] 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. 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. 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.

[0056] Since the degree of outward convexity of the surrounding plate 300 gradually increases along the spiral expanding direction of the volute 10, it means that the degree of curvature of the surrounding plate 300 gradually increases along the spiral expanding direction of the volute 10. It can be understood as follows: the n curved lines 330 are arranged in sequence along the spiral expanding direction of the volute 10 and the radius of curvature gradually decreases.

[0057] The radii of curvature of the n curves 330 are r1, r2, r3, r4, r5,..., and rn in sequence, and satisfy r1>r2>r3>r4>r5>...>rn. By such arrangement, the radii of curvature of the n curves 330 gradually decrease along the spiral expanding direction of the volute 10, so that the degree of outward protrusion (bending degree) of the shroud 300 gradually increases, the gradual change of the shroud 300 along the spiral expanding direction of the volute 10 is more natural, and it is more conducive to reducing the formation of eddy current. 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 two adjacent 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.

[0058] In some embodiments, in combination with Figure 7 and Figure 8 As shown, along 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, and satisfy L1>0.3L and L2>0.3L.

[0059] Specifically, the wind wheel 20 is arranged inside the volute 10, and along the axial direction of the wind wheel 20, the speed of the airflow thrown out by the wind wheel 20 at 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 outwardly protruding 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 outwardly protruding part to the two ends, that is, the most outwardly protruding 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 outwardly protruding part to 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 shroud 300, and the airflow with lower speed has a relatively shorter flow path from the wind wheel 20 to the shroud 300. By such arrangement, the shroud 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, and it is more conducive to reducing the formation of eddy current.

[0060] Optionally, when L1=0.5L and L2=0.5L, the most outwardly protruding 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.

[0061] In some embodiments, a virtual plane is made perpendicular to the central axis of the volute 10 through the third point T, and the shroud 300 is mirror-symmetric about the virtual plane. This helps to reduce manufacturing difficulty, and mirror-symmetric arrangement can reduce vortex generation problems caused by uneven flow, reduce energy loss, and ensure stable operation of the fan.

[0062] Of course, in other embodiments, a virtual plane can be made perpendicular to the central axis of the volute 10 through the third point T, and the shroud 300 can be non-mirror-symmetric about the virtual plane.

[0063] In some embodiments, in combination with Figure 1 , Figure 3 , Figure 6 and Figure 9 , 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.

[0064] The shroud 300 is tapered from the most convex part 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 includes a first shroud 310 and a second shroud 320, the first shroud 310 and the second shroud 320 are connected and fixed 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 close to the first end plate 100, and the second shroud 320 is close to the second end plate 200. In this way, the first shroud 310 is gradually tapered away from the second shroud 320 towards the first end plate 100, and the second shroud 320 is gradually 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 methods 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.

[0065] In some embodiments, in combination with Figure 1 to Figure 9 , the shroud 300 and the first end plate 100 are circularly arcuate, and the shroud 300 and the second end plate 200 are circularly arcuate.

[0066] In related technologies, 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 shroud arranged between the front plate and the rear plate. When the fan rotates, the airflow enters the inside of the volute from the air inlet and is discharged from the air outlet. When the airflow flows from the air inlet towards the air outlet, vortexes are generated in the angle space between the front plate and the shroud, and in the angle space between the rear plate and the shroud, resulting in large flow impact loss.

[0067] To this end, in the present embodiment, a circular arc transition is provided between the first end plate 100 and the surrounding plate 300, and a circular arc transition is provided between the second end plate 200 and the surrounding plate 300. The so-called circular arc transition is a smooth transition between two targets achieved by at least one curved surface or curved surface structure, thereby avoiding sharp corners or convex edges. By so doing, the generation of vortexes in the corner space between the first end plate 100 and the surrounding plate 300 and the corner 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.

[0068] In some embodiments, in combination with Figure 6 As shown in FIG. 1, along the spiral expanding direction of the volute 10, the degree of curvature of the circular arc transition portion between the surrounding plate 300 and the first end plate 100 gradually decreases, and the degree of curvature of the circular arc transition portion between the surrounding plate 300 and the second end plate 200 gradually decreases.

[0069] Along the spiral expanding direction of the volute 10, the flow passage cross section between the surrounding plate 300 and the impeller 20 gradually increases, and under the premise that the flow rate of the fan is unchanged, the air flow velocity will gradually decrease, and low flow velocity is more prone to generate vortexes in the corner space between the first end plate 100 and the surrounding plate 300 and the corner space between the second end plate 200 and the surrounding plate 300. Therefore, in the present embodiment, along the spiral expanding direction of the volute 10, the degree of curvature of the circular arc transition portion between the surrounding plate 300 and the first end plate 100 gradually decreases, and the degree of curvature of the circular arc transition portion between the surrounding plate 300 and the second end plate 200 gradually decreases. The gradually decreasing degree of curvature means that it tends to be flat (still curved), which can further inhibit the formation of vortexes in the corner space between the surrounding plate 300 and the first end plate 100 and the corner space between the surrounding plate 300 and the second end plate 200, thereby further improving the overall performance of the fan.

[0070] Along the spiral expanding direction of the volute 10, the gradually decreasing degree of curvature of the circular arc transition portion between the surrounding plate 300 and the first end plate 100 can be understood as follows: in combination with Figure 1 to Figure 6 As shown in FIG. 1, the circular 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 expanding direction of the volute 10, and the radius of curvature gradually increases.

[0071] The circular arc transition portion between the surrounding plate 300 and the first end plate 100 is marked I in FIG. 1, and the first transition curve 410 is marked II 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, and satisfy R11

[0072] Optionally, the radius of curvature of the first transition curve 410 is 3mm-50mm, for example, the radius of curvature of the first transition curve 410 is 3mm, 10mm, 15mm, 25mm, 35mm, 40mm, 45mm or 50mm, so that the manufacturing of the arc transition part between the surrounding plate 300 and the first end plate 100 can be ensured, and the internal flow area of the volute 10 is not excessively reduced compared with a right angle.

[0073] Similarly, the bending degree of the arc transition part between the surrounding plate 300 and the second end plate 200 gradually decreases along the spiral expansion direction of the volute 10 can be understood as follows: in combination with FIG. 4B, Figure 1 to Figure 6 As shown in FIG. 4B, the arc transition part 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.

[0074] The arc transition part between the surrounding plate 300 and the second end plate 200 is marked as II in FIG. 4B, and the second transition curve 420 is marked as 420 in FIG. 4B. Figure 3 Figure 3 ​The radii of curvature of the n second transition curves 420 are R21, R22, R23, R24, R25,..., R2n in sequence, and satisfy R21

[0075] Optionally, the radius of curvature of the second transition curve 420 is 3 mm to 50 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, or 50 mm, so that the manufacturing of the arc transition part between the surrounding plate 300 and the second end plate 200 can be ensured, and the internal flow area of the volute 10 is not excessively reduced compared to a right angle.

[0076] In some embodiments, in combination with Figure 1 to Figure 6 As shown, the arc transition part 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.

[0077] As can be seen from the above, along the spiral expansion direction of the volute 10, the bending degree of the arc transition part 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 part I is smoother, the transition of the first end plate 100 and the arc transition part 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 part I is smoother, further reducing the generation of vortex, and improving the overall performance.

[0078] Optionally, in some embodiments, in combination with Figure 1 andFigure 2 As shown, 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 seen in FIG. 12A. Figure 1 As shown in FIG. 12A, 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, so as to reduce the manufacturing difficulty of the circular arc transition part I. Since the n first transition curves 410 are sequentially arranged along the spiral expansion direction of the volute 10 and the arc length gradually increases, by locating the connection points of the n first transition curves 410 each connecting the first end plate 100 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 being gradually expanded towards both the position of the first end plate 100 and the position of the surrounding plate 300, so as to better control the variable and reduce the manufacturing difficulty of the volute 10.

[0079] Similarly, in some embodiments, in combination with Figure 6 As shown, the circular arc transition part 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, and the n second transition curves 420 are sequentially arranged along the spiral expansion direction of the volute 10 and the arc length gradually increases.

[0080] 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 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 second transition curves 420 along the spiral expansion direction of the volute 10 gradually increases, so as to make the transition of the surrounding plate 300 and the circular arc transition part II more smooth, the transition of the second end plate 200 and the circular arc transition part II more smooth, and the included angle space between the surrounding plate 300 and the second end plate 200 gradually increase, so that the flow of low-speed airflow in the circular arc transition part II is more smooth, further reducing the generation of vortex, and improving the overall performance.

[0081] Optionally, in some embodiments, in combination with Figure 3 and Figure 4 As shown, the n second transition curves 420 each connect the connection points of the second end plate 200 located in the same plane perpendicular to the central axis of the volute 10, and the connection points of the second transition curves 420 connecting the second end plate 200 are seen in FIG. 12B. 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 can be reduced.

[0082] In some embodiments, in combination with Figure 6 As shown, the surrounding plate 300 has two sides in the axial direction of the volute 10, which are respectively the first side and the second side, and the surrounding plate 300 has n curves 330 connecting the first side and the second side, the n curves 330 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 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, so that 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 part between the surrounding plate 300 and the first end plate 100 and the circular arc transition part between the surrounding plate 300 and the second end plate 200 are more smoothly transitioned with the surrounding plate 300.

[0083] In some embodiments, in combination with Figure 7 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 with respect to the surrounding plate 300, so as to facilitate the reduction of manufacturing difficulty, and the mirror-symmetrically arranged can reduce the vortex generation problem caused by uneven flow, reduce energy loss, and ensure stable operation of the fan.

[0084] Of course, in other embodiments, the circular arc transition part between the surrounding plate 300 and the first end plate 100 can be non-mirror-symmetrically arranged with the circular arc transition part between the surrounding plate 300 and the second end plate 200 with respect to the surrounding plate 300.

[0085] In some embodiments, in combination with Figure 7As shown, the first end plate 100 and the second end plate 200 are parallel, so that the volute 10 constitutes an equal-thickness design. On the basis of the equal-thickness design of the volute 10, the performance of the fan is improved through improvements in 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.

[0086] In some embodiments, in combination with Figure 1 to Figure 9 As shown, the first end plate 100 and the second end plate 200 are respectively provided with air inlets 510, so that the fan wheel 20 can realize air intake on both axial sides.

[0087] In some embodiments, in combination with Figure 9 As shown, the surrounding plate 300 includes a first surrounding plate 310 and a second surrounding plate 320 arranged along the axial direction of the volute 10. The first surrounding plate 310 is integrally formed with the first end plate 100, and the second surrounding plate 320 is integrally formed with the second end plate 200. The first surrounding plate 310 and the second surrounding plate 320 are connected.

[0088] Integrally formed means that it is prepared through an integrally forming process. Taking the integrally forming of the first surrounding plate 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 surrounding plate 310 and the first end plate 100 combined as one is formed, and the first surrounding plate 310 and the first end plate 100 are arc transitioned. Of course, the integrally forming between the first surrounding plate 310 and the first end plate 100 can also be prepared by metal and processed into an integrated structure based on machining processes such as cutting, drilling, stretching, and stamping.

[0089] In related technologies, the front plate, the rear plate, and the surrounding plate need to be connected and assembled with each other. In the present 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. This not only reduces the number of parts, but also reduces the number of connection times of assembly, so as to help 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, and fusion, as long as the first surrounding plate 310 and the second surrounding plate 320 can be fixed together.

[0090] The second aspect of the present application discloses a fan, in some embodiments, the fan comprises the volute 10 described above, the fan wheel 20 of the fan is arranged in the volute 10, the motor of the fan is connected with the fan wheel 20, the volute 10 comprises 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 surrounding plate 300 is convex outward relative to the first end plate 100 and the second end plate 200 in the direction away from the inside of the volute 10, and the degree of convexity of the surrounding plate 300 gradually increases along the spiral expanding direction of the volute 10. In this embodiment, the surrounding plate 300 is convex outward relative to the first end plate 100 and the second end plate 200 in the direction away from the inside of the volute 10, which can reduce the uneven degree of airflow speed impacting the surrounding plate 300, and the static pressure conversion is more uniform, which can effectively inhibit the generation of vortex, and the degree of convexity of the surrounding plate 300 gradually increases along the spiral expanding direction of the volute 10, which can further reduce the uneven degree of airflow speed impacting the surrounding plate 300 under the condition that the flow rate of the fan is unchanged, and the static pressure conversion is more uniform, and the performance of the fan is improved. It can be understood that the volute 10 of the fan in this 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.

[0091] The third aspect of the present application discloses an extractor hood, in some embodiments, the extractor hood comprises the fan described above, and the fan of the extractor hood in this 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.

[0092] The above is only the preferred embodiments of the present application, and does not limit the patent scope of the present application, and any equivalent structural transformation made according to the content of the present application specification and drawings, or direct / indirect application in other related technical fields is included in the patent protection scope of the present application.

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) arranged between the first end plate (100) and the second end plate (200), and the surrounding plate (300) is convex outward 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 degree of convexity of the surrounding plate (300) gradually increases, the surrounding plate (300) is convexly curved, the surrounding plate (300) and the first end plate (100) are circularly arc transitioned, the surrounding plate (300) and the second end plate (200) are circularly arc transitioned, along the spiral expanding direction of the volute (10), the degree of curvature of the circular arc transition part between the surrounding plate (300) and the first end plate (100) gradually decreases, and the degree of curvature of the circular arc transition part between the surrounding plate (300) and the second end plate (200) gradually decreases. The circular arc transition part between the surrounding plate (300) and the first end plate (100) comprises n first transition curves (410) connecting the surrounding plate (300) and the first end plate (100), and the n first transition curves (410) are sequentially arranged along the spiral expanding direction of the volute (10) and gradually increase in arc length; the circular arc transition part between the surrounding plate (300) and the second end plate (200) comprises n second transition curves (420) connecting the surrounding plate (300) and the second end plate (200), and the n second transition curves (420) are sequentially arranged along the spiral expanding direction of the volute (10) and gradually increase in arc length.

2. The volute of claim 1, wherein The surrounding plate (300) has n curves (330) connecting the first side and the second side along the axial 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, along 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.

3. The volute of claim 2, wherein Along 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, satisfying L1>0.3L and L2>0.3L.

4. The volute of claim 3, wherein Satisfying L1=0.5L and L2=0.5L.

5. The volute of claim 3 wherein, 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-symmetrical or non-mirror-symmetrical about the virtual plane.

6. The volute of claim 3 wherein, 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) 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).

7. The volute of claim 1 wherein, The shroud (300) has a first side and a second side on both sides of the axial direction of the volute (10), the shroud (300) has n curves (330) connecting the first side and the second side, the n curves (330) 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. And / or, the radius of curvature of the first transition curve (410) is 3mm-50mm, and the radius of curvature of the second transition curve (420) is 3mm-50mm.

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

9. The volute of claim 1 wherein, The circular arc transition part between the shroud (300) and the first end plate (100) is mirror-symmetrical or non-mirror-symmetrical about the shroud (300) with the circular arc transition part between the shroud (300) and the second end plate (200).

10. A volute according to any one of claims 1 to 9, wherein The first end plate (100) and the second end plate (200) are parallel to each other. And / or, the first end plate (100) and the second end plate (200) are respectively provided with an air inlet (510). And / or, 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) and the first end plate (100) are integrally formed, the second shroud (320) and the second end plate (200) are integrally formed, and the first shroud (310) and the second shroud (320) are connected.

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

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

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