Volute, fan and extractor hood

Abstract

The application discloses a volute, a fan and a range hood. The volute has a volute profile line, the volute profile line has a starting point S and an ending point E, an air outlet of the volute is formed between the starting point S and the ending point E, an extension direction from the starting point S to the ending point E is a spiral expansion direction of the volute profile line, the volute profile line comprises profile line segments SA, AB, BC, CD and DE arranged in sequence, the volute profile line is coincident with a virtual volute profile line except the profile line segments AB and CD, the profile line segment AB is curved towards a center point O and is tangent to a straight line on one side of the virtual volute profile line, and the profile line segment CD is curved towards the center point O and is tangent to a straight line on the other side of the virtual volute profile line. The volute is improved in the application, has a relatively large size under the premise that the volute can be installed into a rack, and meanwhile, influences on performance of the fan are reduced as much as possible.

Description

Technical Field

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

[0002] Range hoods are essential kitchen appliances for exhausting smoke. The fan is the core power component of a range hood, determining its performance levels such as airflow, static pressure, noise, and efficiency. The fan consists of parts like the volute, impeller, and air inlet ring. The fan is installed in a frame. Without changing the frame size, the volute needs to be as large as possible. In related technologies, the portions of the volute corresponding to the left and right sides of the frame need to be cut straight edges, meaning the volute profile aligns with the left and right sides of the frame as a straight line. While this approach maximizes the volute size within a limited space, the cut edges can negatively impact fan performance. Utility Model Content

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

[0004] To achieve the above objectives, this application discloses a volute, the volute having a volute profile with a starting point S and an ending point E, an air outlet of the volute being formed between the starting point S and the ending point E, the extension direction from the starting point S to the ending point E being the spiral expansion direction of the volute profile, and the volute profile including profile segments SA, AB, BC, CD and DE arranged sequentially;

[0005] Define a rectangular coordinate system, wherein the X-axis and Y-axis of the rectangular coordinate system pass through the center point O of the volute profile, the starting point S and the ending point E are located in the second quadrant, point A is located in the first quadrant, point B is located in the fourth quadrant, point C is located in the third quadrant, and point D is located in the second quadrant.

[0006] Define a virtual volute profile, wherein the opposite sides of the virtual volute profile are straight lines that intersect the X-axis. The volute profile, except for the profile segments AB and CD, coincides with the virtual volute profile. The profile segment AB bends toward the center point O and is tangent to a straight line on one side of the virtual volute profile, and the profile segment CD bends toward the center point O and is tangent to a straight line on the other side of the virtual volute profile.

[0007] In some embodiments of this application, the shaped line segment AB is formed by a smooth transition and connection of multiple circular arcs whose centers do not coincide;

[0008] And / or, the line segment AB is formed by smoothly connecting multiple arcs of different radii.

[0009] In some embodiments of this application, the shaped line segment CD is formed by smoothly connecting multiple arcs whose centers do not coincide;

[0010] And / or, the shape line segment CD is formed by smoothly connecting multiple arcs of different radii.

[0011] In some embodiments of this application, in the first quadrant, the angle between the line connecting the center point O and the point A and the X-axis is 10° to 30°.

[0012] And / or, in the fourth quadrant, the angle between the line connecting the center point O and the point B and the X-axis is 25° to 45°;

[0013] And / or, in the third quadrant, the angle between the line connecting the center point O and the point C and the X-axis is 5° to 25°;

[0014] And / or, in the second quadrant, the angle between the line connecting the center point O and the point D and the X-axis is 5° to 25°.

[0015] In some embodiments of this application, the volute includes a first end plate, a second end plate, and a surrounding plate, the surrounding plate being disposed between the first end plate and the second end plate, the surrounding plate and the first end plate having a rounded transition, and the surrounding plate and the second end plate having a rounded transition.

[0016] In some embodiments of this application, along the spiral expansion direction of the volute, the curvature of the arc transition portion between the surrounding plate and the first end plate gradually decreases, and the curvature of the arc transition portion between the surrounding plate and the second end plate gradually decreases.

[0017] In some embodiments of this application, the arc transition portion between the enclosure and the first end plate includes n first transition curves connecting the enclosure and the first end plate. The n first transition curves are arranged sequentially along the spiral expansion direction of the volute, and the arc length gradually increases.

[0018] The arc transition portion between the enclosure and the second end plate includes n second transition curves connecting the enclosure and the second end plate. The n second transition curves are arranged sequentially along the spiral expansion direction of the volute, and the arc length gradually increases.

[0019] In some embodiments of this application, the enclosure includes a first enclosure and a second enclosure arranged along the axial direction of the volute, wherein the first enclosure and the first end plate are integrally formed, the second enclosure and the second end plate are integrally formed, and the first enclosure and the second enclosure are connected.

[0020] A second aspect of this application discloses a fan comprising the aforementioned volute.

[0021] A third aspect of this application discloses a range hood, which includes the aforementioned fan.

[0022] In this application's technical solution, the profile segment AB bends towards the center point O and is tangent to one side of the virtual volute profile, while the profile segment CD bends towards the center point O and is tangent to one side of the virtual volute profile. In this way, the volute has a relatively large size while ensuring that it can be installed into the frame, and at the same time, the impact on the fan performance is minimized.

[0023] Other advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description or may be learned by practice of this application. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this application 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 this application. For those skilled in the art, other designs can be obtained based on the structures shown in these drawings without creative effort.

[0025] Figure 1 These are schematic diagrams of the volute in some embodiments;

[0026] Figure 2 for Figure 1 The volute shown illustrates graphic X (see red portion);

[0027] Figure 3 This is a second schematic diagram of the volute in some embodiments;

[0028] Figure 4 for Figure 3 The volute shown illustrates a figure Y (see red portion);

[0029] Figure 5 This is a third schematic diagram of the volute in some embodiments;

[0030] Figure 6 This is a schematic diagram of the volute profile in some embodiments;

[0031] Figure 7 This is a comparative schematic diagram of the volute profile in some embodiments and the volute profile in the prior art;

[0032] Figure 8 This is another comparative schematic diagram of the volute profile in some embodiments and the volute profile in the prior art;

[0033] Figure 9 A partial cross-sectional view of the volute in some embodiments;

[0034] Figure 10 This is an exploded view of the volute in some embodiments.

[0035] Explanation of icon numbers:

[0036] 10 volute, 11 volute profile, 100 first end plate, 200 second end plate, 300 surrounding plate, 310 first surrounding plate, 320 second surrounding plate, 410 first transition curve, 420 second transition curve, 510 air inlet, 520 air outlet.

[0037] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0038] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0039] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0040] In this application, unless otherwise expressly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0041] Furthermore, the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. If the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed in this application.

[0042] The first aspect of this application discloses a volute 10, which, in some embodiments, is combined with Figures 1 to 8 As shown, the volute 10 has a volute profile 11, which has a starting point S and an ending point E. An air outlet 520 is formed between the starting point S and the ending point E. The extension direction from the starting point S to the ending point E is the spiral expansion direction of the volute profile 11 (i.e., the spiral extension direction 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, while the other side is relatively farther away from the volute tongue of the volute 10). The volute profile 11 includes profile segments SA, AB, BC, CD, and DE arranged sequentially. A rectangular coordinate system is defined (equivalent to the volute profile 11 being in a...). In a rectangular coordinate system, the X-axis and Y-axis pass through the center point O of the volute profile 11. The starting point S and the ending point E are located in the second quadrant, point A is located in the first quadrant, point B is located in the fourth quadrant, point C is located in the third quadrant, and point D is located in the second quadrant. Define a virtual volute profile (or, in other words, the rectangular coordinate system has a virtual volute profile). The opposite sides of the virtual volute profile are straight lines that intersect the X-axis. The volute profile 11 coincides with the virtual volute profile except for profile segments AB and CD. Profile segment AB bends towards the center point O and is tangent to one of the straight lines on one side of the virtual volute profile. Profile segment CD bends towards the center point O and is tangent to the straight line on the other side of the virtual volute profile.

[0043] In this embodiment, the profile segment AB bends toward the center point O and is tangent to one side of the virtual volute profile, and the profile segment CD bends toward the center point O and is tangent to one side of the virtual volute profile. In this way, the volute 10 is able to be installed into the frame while having a relatively large size, and at the same time, the impact on the fan performance is minimized.

[0044] Specifically, taking the range hood as an example, the volute 10 is described below. The range hood includes a smoke collection hood and a frame mounted above the smoke collection hood. The fan is installed in the frame and includes the volute 10, an impeller, and a motor. The volute 10 is a component for gas collection and energy conversion, used to house the impeller. When the fan is installed in the frame, the air outlet 520 of the volute 10 is open upwards (including diagonally upwards). The orientation in this article is based on the range hood being installed on a wall. Generally, with the frame remaining unchanged, the size of the volute 10 needs to be as large as possible to lay the foundation for the fan's performance.

[0045] Assuming volute A has an ideal volute profile a (e.g., an Archimedean spiral), if volute A is too large to fit into the frame (e.g., insufficient safety distance between volute A and the left and right sides of the frame), in existing technology, volute B is formed by cutting straight edges on the left and right sides of volute A, i.e., removing portions of the left and right sides. This results in straight lines (M1M2, M3M4) forming the left and right sides of the volute profile b of volute B, allowing it to be installed into the frame (while maintaining a relatively constant overall size relative to volute A and ensuring sufficient safety distance between volute B and the left and right sides of the frame). However, the abrupt change between the straight lines (M1M2, M3M4) on the left and right sides of volute profile b and the rest of volute profile b negatively impacts fan performance compared to volute profile a.

[0046] Therefore, improvements are made in this embodiment. The volute 10 in this embodiment has a volute profile 11. Except for profile segments AB and CD, the volute profile 11 coincides with the virtual volute profile. The virtual volute profile can be understood as the volute profile b in the prior art. Profile segment AB bends towards the center point O and is tangent to a straight line (straight line M1M2) on one side of the virtual volute profile. Profile segment CD bends towards the center point O and is tangent to a straight line (straight line M3M4) on the other side of the virtual volute profile. That is, relative to the straight lines (straight lines M1M2) on the left and right sides of the volute profile b... 2. Straight lines M3 and M4 are replaced by profile segments AB and CD in this embodiment. Thus, relative to the volute profile b, in the volute profile 11 of this embodiment, profile segments AB and CD each bend towards the center point O. Therefore, profile segments AB and CD are located within the range of volute profile b, resulting in smoother transitions between profile segments AB and the rest of volute profile 11, as well as between profile segments CD and the rest of volute profile 11, minimizing abrupt changes and reducing the impact on airflow. Furthermore, since volute profile 11, except for profile segments AB and CD, coincides with the virtual volute profile, and profile segments AB and the virtual volute profile are tangent on one side of the straight line, while profile segment CD and the virtual volute profile are tangent on the other side, the overall dimensions of volute 10, especially along the X-axis, remain essentially unchanged compared to volute B, ensuring that volute 10 has a larger size and can be installed into the frame.

[0047] Optionally, the profile segment AB is formed by smoothly connecting multiple arcs with non-coincident centers and / or unequal radii. "Multiple segments" means two or more segments. This makes the curvature of profile segment AB smoother, further reducing abrupt changes between profile segment AB and the rest of the volute profile 11 (profile segment SA, profile segment BC), thereby further reducing the impact on fan performance. Similarly, profile segment CD is formed by smoothly connecting multiple arcs with non-coincident centers and / or unequal radii.

[0048] In some embodiments, combined with Figure 6 As shown, in the first quadrant, the angle between the line connecting the center point O and point A and the X-axis is 10° to 30°. For example, the angle between the line connecting the center point O and point A and the X-axis is α, where α is 10°, 15°, 20°, 25° or 30°. Since the starting point S and the ending point E are located in the second quadrant, the impact on the fan performance can be further reduced by optimizing the angle of α.

[0049] Similarly, in the fourth quadrant, the angle between the line connecting the center point O and point B and the X-axis is 25° to 45°. For example, the angle between the line connecting the center point O and point B and the X-axis is β, where β is 25°, 30°, 35°, 40°, or 45°.

[0050] In the third quadrant, the angle between the line connecting the center point O and point C and the X-axis is 5° to 25°, and the angle between the line connecting the center point O and point C and the X-axis is γ, where γ is 5°, 10°, 15°, 20° or 25°.

[0051] In the second quadrant, the angle between the line connecting the center point O and point D and the X-axis is 5° to 25°, and the angle between the line connecting the center point O and point D and the X-axis is δ, where δ is 5°, 10°, 15°, 20° or 25°.

[0052] In some embodiments, combined with Figures 1 to 5 as well as Figure 9 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 disposed between the first end plate 100 and the second end plate 200. The surrounding plate 300 and the first end plate 100 are connected by an arc, and the surrounding plate 300 and the second end plate 200 are connected by an arc.

[0053] In this embodiment, the first end plate 100, the surrounding plate 300, and the second end plate 200 enclose a cavity for mounting the impeller. Furthermore, the first end plate 100, the surrounding plate 300, and the second end plate 200 also enclose an air outlet 520 that communicates with the cavity. The first end plate 100 is provided with an air inlet 510, or the second end plate 200 is provided with an air inlet 510, or both the first end plate 100 and the second end plate 200 are provided with air inlets 510. The impeller is connected to a motor, and the motor drives the impeller to rotate. When the impeller rotates, the airflow enters the interior (cavity) of the volute 10 from the air inlet 510 and is discharged from the air outlet 520.

[0054] The first end plate 100 and the surrounding plate 300 have a rounded transition, as do the second end plate 200 and the surrounding plate 300. A rounded transition means that at least one curved surface or curved structure is used to achieve a smooth transition between the two objects, thereby avoiding sharp corners or protruding edges. This arrangement, to a certain extent, suppresses the generation of vortices 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. Compared to right-angled spaces, this embodiment can reduce flow losses, improve the static pressure recovery capability of the volute 10, thereby improving the static pressure and flow efficiency of the fan and reducing noise.

[0055] In some embodiments, combined with Figures 1 to 5 As shown, along the spiral expansion direction of the volute 10, the curvature of the arc transition portion between the surrounding plate 300 and the first end plate 100 gradually decreases, and the curvature of the arc transition portion between the surrounding plate 300 and the second end plate 200 gradually decreases.

[0056] It is understandable that, along the spiral expansion direction of the volute 10, the cross-section of the flow channel between the enclosure plate 300 and the impeller gradually increases. Under the premise that the fan flow rate remains unchanged, the airflow velocity will gradually decrease. Low flow velocity makes it easier to generate vortices in the angle space between the first end plate 100 and the enclosure plate 300 and the angle space between the second end plate 200 and the enclosure plate 300. Therefore, in this embodiment, along the spiral expansion direction of the volute 10, the curvature of the arc transition portion between the enclosure plate 300 and the first end plate 100 gradually decreases, and the curvature of the arc transition portion between the enclosure plate 300 and the second end plate 200 gradually decreases. The curvature gradually decreases means that it tends to be gentle (still curved), which can further suppress the formation of vortices in the angle space between the enclosure plate 300 and the first end plate 100 and the angle space between the enclosure plate 300 and the second end plate 200, thereby further improving the overall performance of the fan. The spiral expansion direction of the volute 10 can be understood as the spiral extension direction of the enclosure 300 from one side of the air outlet 520 to the other side of the air outlet 520. One side of the air outlet 520 refers to the side closer to the volute tongue, while the other side is relatively far away from the volute tongue.

[0057] Along the spiral expansion direction of the volute 10, the degree of curvature of the arc transition portion between the surrounding plate 300 and the first end plate 100 gradually decreases, which can be understood as follows: (Combined with...) Figure 1 As shown, the arc transition portion between the enclosure 300 and the first end plate 100 includes n first transition curves 410 connecting the enclosure 300 and the first end plate 100. The n first transition curves 410 are arranged sequentially along the spiral expansion direction of the volute 10, and the radius of curvature gradually increases.

[0058] The arc transition between the enclosure 300 and the first end plate 100 is shown below. Figure 1 Mark I in the figure, the first transition curve 410 is shown. Figure 1The curves H11 and H12 in the figure, and the radii of curvature of the n first transition curves 410 are R11, R12, R13, R14, R15...R1n, respectively, satisfying R11 < R12 < R13 < R14 < R15 < ... < R1n. By setting them in this way, the radii of curvature of each of the n first transition curves 410 gradually increase along the spiral expansion direction of the volute 10. This makes the curvature of the arc transition part between the surrounding plate 300 and the first end plate 100 gradually decrease, and the gradual change of the arc transition part between the surrounding plate 300 and the first end plate 100 along the spiral expansion direction of the volute 10 becomes more natural, which is more conducive to reducing the formation of vortices in the included angle space between the surrounding plate 300 and the first end plate 100. It is understandable that the radius of curvature of the first transition curve 410 refers to the radius of curvature at a certain point of the first transition curve 410. That is, among two adjacent first transition curves 410, along the spiral expansion direction of the volute 10, the radius of curvature at any point of the first transition curve 410 on the upstream side is smaller than the radius of curvature at any point of the first transition curve 410 on the downstream side.

[0059] Optionally, the radius of curvature of the first transition curve 410 is 3mm to 50mm. For example, the radius of curvature of the first transition curve 410 is 3mm, 10mm, 15mm, 25mm, 35mm, 40mm, 45mm or 50mm. In this way, the manufacturing of the arc transition portion between the surrounding plate 300 and the first end plate 100 can be guaranteed, avoiding manufacturing difficulties due to excessive size, and the internal flow area of ​​the volute 10 will not be reduced too much compared to a right angle.

[0060] Similarly, along the spiral expansion direction of the volute 10, the degree of curvature of the arc transition portion between the surrounding plate 300 and the second end plate 200 gradually decreases, which can be understood as follows: (Combined with...) Figures 1 to 5 As shown, the arc transition portion between the enclosure plate 300 and the second end plate 200 includes n second transition curves 420 connecting the enclosure plate 300 and the second end plate 200. The n second transition curves 420 are arranged sequentially along the spiral expansion direction of the volute 10, and the radius of curvature gradually increases.

[0061] The arc transition between the enclosure 300 and the second end plate 200 is shown below. Figure 3 Mark II in the middle, the second transition curve 420420 is shown. Figure 3The curves H21 and H22 in the figure, and the radii of curvature of the n second transition curves 420 are R21, R22, R23, R24, R25...R2n, respectively, satisfying R21<R22<R23<R24<R25<...<R2n. By setting them in this way, the radii of curvature of each of the n second transition curves 420 gradually increase along the spiral expansion direction of the volute 10. This makes the curvature of the arc transition part between the surrounding plate 300 and the second end plate 200 gradually decrease, and the gradual change of the arc transition part between the surrounding plate 300 and the second end plate 200 along the spiral expansion direction of the volute 10 becomes more natural, which is more conducive to reducing the formation of vortices in the included space between the surrounding plate 300 and the second end plate 200. It is understandable that the radius of curvature of the second transition curve 420 refers to the radius of curvature at a certain point of the second transition curve 420. That is, among two adjacent second transition curves 420, along the spiral expansion direction of the volute 10, the radius of curvature at any point of the upstream second transition curve 420 is smaller than the radius of curvature at any point of the downstream second transition curve 420.

[0062] Optionally, the radius of curvature of the second transition curve 420 is 3mm to 50mm. For example, the radius of curvature of the second transition curve 420 is 3mm, 10mm, 15mm, 25mm, 35mm, 40mm, 45mm or 50mm. In this way, the manufacturing of the arc transition part between the surrounding plate 300 and the second end plate 200 can be guaranteed, avoiding manufacturing difficulties due to excessive size, and the internal flow area of ​​the volute 10 will not be reduced too much compared to a right angle.

[0063] In some embodiments, combined with Figure 1 As shown, the arc transition portion between the enclosure 300 and the first end plate 100 includes n first transition curves 410 connecting the enclosure 300 and the first end plate 100. The n first transition curves 410 are arranged sequentially along the spiral expansion direction of the volute 10, and the arc length gradually increases.

[0064] As can be seen from the above, along the spiral expansion direction of the volute 10, the curvature of the arc transition section between the surrounding plate 300 and the first end plate 100 gradually decreases. Based on this, 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 curvature range of the n first transition curves 410 along the spiral expansion direction of the volute 10 gradually increases. This makes the transition between the surrounding plate 300 and the arc transition section I smoother, the transition between the first end plate 100 and the arc transition section I 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 section I is smoother, further reducing the generation of vortices and improving overall performance.

[0065] Optionally, in some embodiments, combined with Figure 1 and Figure 2 As shown, the connection points of the n first transition curves 410 to the first end plate 100 are located on the same plane perpendicular to the central axis of the volute 10 (the central axis of the volute 10 is the central axis of the impeller). The connection points of the first transition curves 410 to the first end plate 100 are shown in the figure. Figure 1 At point H12, as n approaches infinity, the connection points of the n first transition curves 410 to the first end plate 100 form a shape Z1. This shape Z1 is located in a plane perpendicular to the central axis of the volute 10, thus reducing the manufacturing difficulty of the arc transition part I. Since the n first transition curves 410 are arranged sequentially along the spiral expansion direction of the volute 10 and the arc length gradually increases, the connection points of the n first transition curves 410 to the first end plate 100 are located in the same plane perpendicular to the central axis of the volute 10. The arc transition part I only expands towards the surrounding plate 300, without needing to expand towards both the location of the first end plate 100 and the location of the surrounding plate 300. This allows for better control of variables and reduces the manufacturing difficulty of the volute 10.

[0066] Similarly, in some embodiments, combined with Figure 3 As shown, the arc transition portion between the enclosure plate 300 and the second end plate 200 includes n second transition curves 420 connecting the enclosure plate 300 and the second end plate 200. The n second transition curves 420 are arranged sequentially along the spiral expansion direction of the volute 10, and the arc length gradually increases.

[0067] As can be seen from the above, along the spiral expansion direction of the volute 10, the curvature of the arc transition section between the surrounding plate 300 and the second end plate 200 gradually decreases. Based on this, 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 curvature range of the n second transition curves 420 along the spiral expansion direction of the volute 10 gradually increases. This makes the transition between the surrounding plate 300 and the arc transition section II smoother, the transition between the second end plate 200 and the arc transition section II smoother, and the angle space between the surrounding plate 300 and the second end plate 200 gradually increases. The flow of low-speed airflow in the arc transition section II is smoother, further reducing the generation of vortices and improving overall performance.

[0068] Optionally, in some embodiments, combined with Figure 3 and Figure 4 As shown, the connection points of the n second transition curves 420 to the second end plate 200 are located on the same plane perpendicular to the central axis of the volute 10. The connection points of the second transition curves 420 to the second end plate 200 are shown in the figure. Figure 3At point H22, as n approaches infinity, the connection points of the n second transition curves 420 to the second end plate 200 form a shape Z2. This shape Z2 is located in a plane perpendicular to the central axis of the volute 10, thus reducing the manufacturing difficulty of the arc transition part II. Since the n second transition curves 420 are arranged sequentially along the spiral expansion direction of the volute 10 and the arc length gradually increases, and the connection points of the n second transition curves 420 to the second end plate 200 are located in the same plane perpendicular to the central axis of the volute 10, the arc transition part II only expands towards the surrounding plate 300, without needing to expand towards both the location of the second end plate 200 and the location of the surrounding plate 300. This allows for better control of variables and reduces the manufacturing difficulty of the volute 10.

[0069] In some embodiments, combined with Figure 9 As shown, the arc transition portion between the enclosure plate 300 and the first end plate 100, and the arc transition portion between the enclosure plate 300 and the second end plate 200, are mirror-symmetrical about the enclosure plate 300. This helps to reduce manufacturing difficulty, and the mirror-symmetrical setting can reduce the problem of eddy current generation caused by uneven flow, reduce energy loss, and ensure the stable operation of the fan.

[0070] Of course, in other embodiments, the arc transition portion between the enclosure 300 and the first end plate 100 may be non-mirror symmetrical with respect to the arc transition portion between the enclosure 300 and the second end plate 200.

[0071] In some embodiments, combined with Figure 1 and Figure 10 As shown, the enclosure 300 includes a first enclosure 310 and a second enclosure 320 arranged along the axial direction of the volute 10 (the axial direction of the volute 10 is the axial direction of the impeller). The first enclosure 310 and the first end plate 100 are integrally formed, the second enclosure 320 and the second end plate 200 are integrally formed, and the first enclosure 310 and the second enclosure 320 are connected.

[0072] One-piece molding refers to the process of manufacturing a product using a single molding technique. Taking the one-piece molding of the first enclosure plate 310 and the first end plate 100 as an example, it can be manufactured using plastic. Molten plastic is injected into a mold, and after the molten plastic solidifies, a structure is formed where the first enclosure plate 310 and the first end plate 100 are integrated, with a rounded transition between them. Alternatively, the one-piece molding of the first enclosure plate 310 and the first end plate 100 can also be achieved using metal and machined using techniques such as cutting, drilling, stretching, and stamping.

[0073] In existing technologies, the front plate, rear plate, and side plates need to be connected and assembled together. This embodiment uses a first side plate 310 and a first end plate 100 integrally formed, and a second side plate 320 and a second end plate integrally formed. The first side plate 310 and the second side plate 320 are connected, which not only reduces the number of parts but also reduces the number of assembly connections. This helps simplify the structure of the volute 10, improves the ease of manufacturing the volute 10, and also enhances the overall structural strength of the volute 10. It is understood that there are various ways to connect the first side plate 310 and the second side plate 320, including but not limited to riveting, screwing, welding, and fusion, as long as the first side plate 310 and the second side plate 320 can be fixed together.

[0074] The second aspect of this application discloses a fan. In some embodiments, the fan includes the aforementioned volute 10, the fan impeller is disposed inside the volute 10, and the fan motor is connected to the impeller. The volute 10 of the fan in this embodiment adopts the technical solution of the aforementioned embodiment, and therefore has at least the beneficial effects brought about by the technical solution of the aforementioned embodiment, which will not be repeated here.

[0075] The third aspect of this application discloses a range hood. In some embodiments, the range hood includes the aforementioned fan. The fan of the range hood in this embodiment adopts the technical solution of the aforementioned embodiment, and therefore has at least the beneficial effects brought about by the technical solution of the aforementioned embodiment, which will not be repeated here.

[0076] The above are merely preferred embodiments of this application and do not limit the patent scope of this application. Any equivalent structural transformations made based on the concept of this application and the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this application.

Claims

1. A volute (10), characterized in that, The volute (10) has a volute profile (11), the volute profile (11) has a starting point S and an ending point E, and an air outlet (520) of the volute (10) is formed between the starting point S and the ending point E. The extension direction from the starting point S to the ending point E is the spiral expansion direction of the volute profile (11). The volute profile (11) includes profile segments SA, AB, BC, CD and DE arranged in sequence. Define a rectangular coordinate system, wherein the X-axis and Y-axis of the rectangular coordinate system pass through the center point O of the volute profile (11), the starting point S and the ending point E are located in the second quadrant, point A is located in the first quadrant, point B is located in the fourth quadrant, point C is located in the third quadrant, and point D is located in the second quadrant. Define a virtual volute profile, wherein the opposite sides of the virtual volute profile are straight lines that intersect the X-axis. The volute profile (11) coincides with the virtual volute profile except for the profile segments AB and CD. The profile segment AB bends toward the center point O and is tangent to a straight line on one side of the virtual volute profile. The profile segment CD bends toward the center point O and is tangent to a straight line on the other side of the virtual volute profile.

2. The volute (10) as described in claim 1, characterized in that, The shape segment AB is formed by the smooth transition and connection of multiple circular arcs whose centers do not coincide; And / or, the line segment AB is formed by smoothly connecting multiple arcs of different radii.

3. The volute (10) as described in claim 1, characterized in that, The line segment CD is formed by the smooth transition and connection of multiple circular arcs whose centers do not coincide; And / or, the shape line segment CD is formed by smoothly connecting multiple arcs of different radii.

4. The volute (10) as described in claim 1, characterized in that, In the first quadrant, the angle between the line connecting the center point O and the point A and the X-axis is 10° to 30°. And / or, in the fourth quadrant, the angle between the line connecting the center point O and the point B and the X-axis is 25° to 45°; And / or, in the third quadrant, the angle between the line connecting the center point O and the point C and the X-axis is 5° to 25°; And / or, in the second quadrant, the angle between the line connecting the center point O and the point D and the X-axis is 5° to 25°.

5. The volute (10) as described in claim 1, characterized in that, The volute (10) includes a first end plate (100), a second end plate (200), and a surrounding plate (300). The surrounding plate (300) is disposed between the first end plate (100) and the second end plate (200). The surrounding plate (300) and the first end plate (100) are connected by an arc, and the surrounding plate (300) and the second end plate (200) are connected by an arc.

6. The volute (10) as described in claim 5, characterized in that, Along the spiral expansion direction of the volute (10), the curvature of the arc transition portion between the surrounding plate (300) and the first end plate (100) gradually decreases, and the curvature of the arc transition portion between the surrounding plate (300) and the second end plate (200) gradually decreases.

7. The volute (10) as described in claim 6, characterized in that, The arc transition portion between the enclosure plate (300) and the first end plate (100) includes n first transition curves (410) connecting the enclosure plate (300) and the first end plate (100). The n first transition curves (410) are arranged sequentially along the spiral expansion direction of the volute (10), and the arc length gradually increases. The arc transition portion between the enclosure plate (300) and the second end plate (200) includes n second transition curves (420) connecting the enclosure plate (300) and the second end plate (200). The n second transition curves (420) are arranged sequentially along the spiral expansion direction of the volute (10), and the arc length gradually increases.

8. The volute (10) as described in claim 5, characterized in that, The enclosure (300) includes a first enclosure (310) and a second enclosure (320) arranged along the axial direction of the volute (10). The first enclosure (310) and the first end plate (100) are integrally formed, and the second enclosure (320) and the second end plate (200) are integrally formed. The first enclosure (310) and the second enclosure (320) are connected.

9. A fan, characterized in that, The fan includes the volute (10) as described in any one of claims 1 to 8.

10. A range hood, characterized in that, The range hood includes the fan as described in claim 9.

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