Volute, fan and smoke machine

Abstract

The utility model provides a kind of volute, fan and range hood, belong to range hood equipment technical field. Including front cover, back cover and ring wall;The front cover is equipped with front air inlet;The back cover is equipped with rear air inlet;The ring wall is connected between the front cover and the back cover, the front cover, the ring wall and the back cover are enclosed to form volute chamber, and form air outlet at the free end of the ring wall;Wherein, the front cover and the back cover are all provided with trimming, the trimming is inclined to the ring wall, when the volute air intake, wind flows into the volute chamber along the trimming of the front cover and / or the back cover, and flows from the air outlet. By setting trimming, reduce wind resistance, so that wind flow more smoothly, reduce vortex, to improve the air intake of volute, reduce volute wind noise.

Description

Technical Field

[0001] This utility model belongs to the technical field of range hood equipment, specifically relating to a volute, a fan, and a range hood. Background Technology

[0002] With changes in people's living environment and improvements in their quality of life, the requirements for range hoods are also increasing. Household range hoods mostly use centrifugal fans for air intake and exhaust. A centrifugal fan generally consists of a volute, a motor, and an impeller. The working principle of a centrifugal fan is that the motor drives the impeller to rotate, doing work on the airflow, which is then discharged radially through the diffusion effect of the volute. Therefore, the volute plays a crucial role in the exhaust process.

[0003] Existing technology has low smoke extraction efficiency of volute casing and is prone to generating vortices inside the casing, which greatly reduces the air volume, air pressure and efficiency of the fan. A large pressure gradient will be formed inside the casing, resulting in increased vortex noise. Utility Model Content

[0004] In view of the problems existing in the prior art, the primary objective of this utility model is to provide a volute housing. The technical problem to be solved is: how to ensure smoother air intake in the volute housing, increase the air intake volume of the volute housing, and reduce wind noise.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A snail shell, comprising:

[0007] Front cover, wherein the front cover is provided with an air inlet;

[0008] Rear cover plate, wherein the rear cover plate is provided with a rear air inlet;

[0009] A ring wall is connected between the front cover plate and the rear cover plate. The front cover plate, the ring wall, and the rear cover plate enclose a volute cavity, and an air outlet is formed at the free end of the ring wall.

[0010] Both the front cover plate and the rear cover plate are provided with slits. The slits on the front cover plate and the rear cover plate are arranged opposite to each other and are inclined towards the annular wall. When the volute is inlet, the air flows into the volute cavity along the slits of the front cover plate and / or the rear cover plate and flows out from the air outlet.

[0011] In the aforementioned type of volute, the connection points between the front cover plate and the rear cover plate and the cut edge are both rounded, with a radius of r1, where 10mm ≤ r1 ≤ 20mm.

[0012] In the aforementioned type of volute, the surface of the cut edge is an arc surface; the profile of the cut edge is formed by connecting an inner arc segment and an outer arc segment, and the projection shape of the inner arc segment and the outer arc segment on the horizontal plane is crescent-shaped.

[0013] In one of the aforementioned volute casings, the center of the inlet is taken as the origin O, and the center point of the outer arc segment is taken as B. The center point B of the outer arc segment is offset from the origin O towards the outlet.

[0014] In the aforementioned type of volute, the center point of the inner arc segment is A, the first endpoint of the inner arc segment is A1, and the second endpoint of the inner arc segment is A2.

[0015] The center point of the outer arc segment is B, the first endpoint of the outer arc segment is B1, and the second endpoint of the outer arc segment is B2;

[0016] The first endpoint A1 of the inner arc segment coincides with the first endpoint B1 of the outer arc segment, and the second endpoint A2 of the inner arc segment coincides with the second endpoint B2 of the outer arc segment.

[0017] In the aforementioned type of volute, the height difference between the center point A of the inner arc segment and the center point B of the outer arc segment is h1;

[0018] The height difference between the first endpoint A1 of the inner circular arc segment or the first endpoint B1 of the outer circular arc segment and the center point B of the outer circular arc segment is h2; h2 and h1 are multiples of each other.

[0019] And / or, the width difference between the center point A of the inner arc segment and the center point B of the outer arc segment is i, where 20mm≤i≤30mm.

[0020] In the aforementioned type of volute, the angle between the origin O of the coordinate system and the first endpoint A1 and the second endpoint A2 of the inner circular arc segment is α, where 90°≤α≤100°.

[0021] In the aforementioned type of volute, the intersection point of the vertical line passing through the origin O and the inner circular arc segment is C, and the distance from the origin O to the intersection point C is d1.

[0022] Draw a line segment from the intersection point C that is tangent to the forward air inlet, with the point of tangency being D. The distance from the origin O to the point of tangency D is r2.

[0023] The angle between line segment OC and line segment OD is β. The relationship between line segment OC and line segment OD satisfies: r2=d1﹒ cosβ, where 32°≤β≤45°.

[0024] In one of the aforementioned volutes, the volute has a volute tongue with a radius of r3, where r3 = 0.05 × (r2 - 2).

[0025] In the aforementioned volute, the first end point of the volute tongue is E1, the second end point of the volute tongue is E2, the first end point E1 of the volute tongue is close to the air outlet, the second end point E2 of the volute tongue is far from the air outlet, and the distance from the second end point E2 of the volute tongue to the forward air inlet is d2, d2 = 0.06·(r2-2).

[0026] In the aforementioned volute, the intersection points of the horizontal line passing through the origin O and the front cover are F and G, the distance of line segment FG is t1, the air outlet has a first point H and a second point I, the distance of line segment HI is t2, and the relationship between the distance t1 of line segment FG and the distance t2 of line segment HI satisfies: 1.5≤t2 / t1≤1.8.

[0027] The second objective of this utility model is to provide a fan:

[0028] A fan, comprising:

[0029] The aforementioned volute;

[0030] An impeller is installed inside the volute cavity of the volute.

[0031] The third objective of this utility model is to provide a range hood:

[0032] A range hood, including the aforementioned fan.

[0033] The beneficial effects of this utility model are:

[0034] The volute of this invention, by setting a slit edge, allows air to enter the volute cavity along a smooth arc surface, and then flow from the volute cavity to the air outlet. This reduces wind resistance, makes the airflow smoother, reduces vortices, and thus increases the air intake of the volute and reduces volute wind noise.

[0035] In this invention, the air enters the volute cavity along the tangential edge of the volute and then flows from the volute cavity to the air outlet, making the airflow smoother, reducing vortices, thereby increasing the air intake volume of the fan, reducing the fan noise, and thus improving the fan's performance.

[0036] This new type of range hood features smoother airflow within the fan, reducing vortices and fan noise, thereby improving the range hood's smoke extraction efficiency and noise levels, thus enhancing overall performance and user experience. Furthermore, the fan design ensures effective oil drainage, further improving the user experience. Attached Figure Description

[0037] Figure 1This is a schematic diagram of the volute structure;

[0038] Figure 2 A schematic diagram of the volute from another perspective;

[0039] Figure 3 This is a structural diagram of the front cover.

[0040] Figure 4 This is a structural schematic diagram of the rear cover plate;

[0041] Figure 5 This is a schematic diagram of the front cover profile;

[0042] Figure 6 This is a schematic diagram of the profile of the volute.

[0043] Figure 7 This is a side view of the volute.

[0044] Figure 8 This is a schematic diagram of the fan structure;

[0045] Figure 9 A schematic diagram of the structure for installing the front air guide ring on the volute;

[0046] Figure 10 A schematic diagram of the structure of the air guide ring after installation on the volute;

[0047] Figure 11 This is a schematic diagram of the structure of the front guide vane;

[0048] Figure 12 This is a cross-sectional view of the front guide vane;

[0049] Figure 13 for Figure 12 Enlarged view of section A in the middle;

[0050] Figure 14 This is a schematic diagram of the impeller structure;

[0051] Figure 15 This is a structural schematic diagram of the impeller from another perspective;

[0052] Figure 16 This is a cross-sectional view of the impeller;

[0053] Figure 17 This is a schematic diagram of a circular array.

[0054] In the diagram, 100 is the volute; 110 is the front cover plate; 111 is the front air inlet; 120 is the rear cover plate; 121 is the rear air inlet; 130 is the annular wall; 140 is the volute cavity; 150 is the air outlet; 160 is the chamfered edge; 161 is the inner arc segment; 162 is the outer arc segment; 170 is the volute tongue; 180 is the front air guide ring; 181 is the annular air guide section; 1811 is the oblique line segment; 1812 is the front... Arc segment; 1813, First arc; 1814, Second arc; 182, Mounting section; 1821, Connecting section; 1822, Bending section; 190, Rear guide ring; 191, Rear arc segment; 200, Impeller; 210, Base; 211, Upper plate; 212, Middle plate; 213, Lower plate; 220, Blade; 230, Flow channel; 231, Inlet end; 232, Outlet end. Detailed Implementation

[0055] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0056] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment 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.

[0057] Example 1:

[0058] It should be noted that the volute 100 of this embodiment can be applied to a fan, which can be applied to a smoke hood, and of course it can also be used in other wind power systems that require the duct structure formed by this volute 100. The following description takes the specific structure of the volute 100 in a fan as an example, but it is not limited thereto.

[0059] like Figure 1-4As shown, this embodiment provides a volute 100, including a front cover plate 110, a rear cover plate 120, and an annular wall 130; the front cover plate 110 has a front air inlet 111; the rear cover plate 120 has a rear air inlet 121; the annular wall 130 connects the front cover plate 110 and the rear cover plate 120, and the front cover plate 110, the annular wall 130, and the rear cover plate 120 enclose a volute cavity 140, and the free space of the annular wall 130... An air outlet 150 is formed at the end; wherein, both the front cover plate 110 and the rear cover plate 120 are provided with a cut edge 160, the cut edges 160 on the front cover plate 110 and the rear cover plate 120 are arranged opposite to each other, and the cut edges 160 are inclined toward the annular wall 130. When the volute 100 is inlet, the air flows into the volute cavity 140 along the cut edges 160 of the front cover plate 110 and / or the rear cover plate 120, and flows out from the air outlet 150.

[0060] In this embodiment, the volute 100 consists of a front cover plate 110, a rear cover plate 120, and an annular wall 130. These three components enclose a volute cavity 140, within which an impeller 200 is installed, forming a fan. An air outlet 150 is formed at the free end of the annular wall 130, which comprises the two ends along its length. Both sides of the annular wall 130 connect to the front cover plate 110 and the rear cover plate 120, and the two ends of the annular wall 130 connect to the front cover plate 110 and the rear cover plate 120 to form the air outlet 150. The front cover plate 110 has a forward air inlet 111, and the rear... The cover plate 120 has a rear air inlet 121. It can be understood that the front air inlet 111 is the main air inlet and the rear air inlet 121 is the secondary air inlet. That is, the volute 100 mainly receives air through the front air inlet 111, but some air will also enter through the rear air inlet 121. Both the front cover plate 110 and the rear cover plate 120 are provided with a chamfered edge 160. The chamfered edge 160 is inclined toward the annular wall 130. That is, the chamfered edges 160 on the front cover plate 110 and the rear cover plate 120 are arranged opposite each other and are symmetrical with respect to the center face of the annular wall 130. Therefore, in this embodiment, the chamfered edge 160 is described by way of example using the front cover plate 110.

[0061] In this embodiment, both the front cover plate 110 and the rear cover plate 120 are provided with tangent edges 160, which are inclined toward the annular wall 130. The surface of the tangent edge 160 of the front cover plate 110 and the front cover plate 110 form a smooth arc surface. Similarly, the surface of the tangent edge 160 of the rear cover plate 120 and the rear cover plate 120 also form a smooth arc surface. When the volute 100 takes in air, the air enters the volute cavity 140 along the smooth arc surface and then flows from the volute cavity 140 to the air outlet 150. Thus, by setting the tangent edge 160, the wind resistance is reduced, making the airflow smoother, reducing vortices, thereby increasing the air intake of the volute 100 and reducing the wind noise of the volute 100. Furthermore, when this volute 100 is applied to a range hood, the oil on the front cover plate 110 and the rear cover plate 120 can flow along the cut edge 160 into the oil guide groove inside the range hood. By setting the cut edge 160, the oil guiding effect of the range hood is greatly improved.

[0062] like Figure 1-4 As shown, the connection between the front cover plate 110 and the rear cover plate 120 and the cut edge 160 is rounded, and the radius of the rounded corner is r1, 10mm≤r1≤20mm.

[0063] In this embodiment, the chamfered edge 160 of the front cover plate 110 and the connection between the front cover plate 110 and the rear cover plate 120 are rounded. These rounded corners make the transition between the chamfered edge 160 and the front cover plate 110, and between the chamfered edge 160 and the rear cover plate 120, smoother and more seamless. This allows air to enter the volute cavity 140 more smoothly along the chamfered edge 160 when the volute 100 is inlet, further reducing vortices, ensuring the airflow of the volute 100, and reducing wind noise. Specifically, the radius of the rounded corner is r1, where 10mm ≤ r1 ≤ 20mm, to ensure a smoother transition.

[0064] like Figure 3 As shown, the surface of the cut edge 160 is an arc surface; the profile of the cut edge 160 is formed by connecting the inner arc segment 161 and the outer arc segment 162, and the projection shape of the inner arc segment 161 and the outer arc segment 162 on the horizontal plane is crescent-shaped.

[0065] In this embodiment, the surface of the tangent 160 is an arc surface, and the projection shapes of the inner arc segment 161 and the outer arc segment 162 on the horizontal plane are crescent-shaped. That is, the tangent 160 is wider in the middle and gradually narrows from the middle along both sides. This design allows for smoother airflow when the volute 100 enters, further reducing vortices and resulting in better noise performance for the volute 100. Of course, in other embodiments, the projections of the inner arc segment 161 and the outer arc segment 162 on the horizontal plane can also be other shapes, as long as smoother airflow is ensured; this is not limited here.

[0066] like Figure 5As shown, in the profile of the volute 100, with the center of the front air inlet 111 as the coordinate origin O, the center point of the outer arc segment 162 is B, and the center point B of the outer arc segment 162 is offset from the coordinate origin O towards the air outlet 150.

[0067] In this embodiment, the center point B of the outer arc segment 162 is offset from the origin O towards the air outlet 150. This setting allows the air to flow more smoothly to the air outlet 150 after entering the volute cavity 140 along the tangent edge 160, reducing vortices in the volute cavity 140, further increasing the air intake of the volute 100, and ensuring the exhaust performance of the volute 100.

[0068] like Figure 5 As shown, the center point of the inner arc segment 161 is A, the first endpoint of the inner arc segment 161 is A1, and the second endpoint of the inner arc segment 161 is A2; the center point of the outer arc segment 162 is B, the first endpoint of the outer arc segment 162 is B1, and the second endpoint of the outer arc segment 162 is B2; the first endpoint A1 of the inner arc segment 161 and the first endpoint B1 of the outer arc segment 162 coincide, and the second endpoint A2 of the inner arc segment 161 and the second endpoint B2 of the outer arc segment 162 coincide.

[0069] In this embodiment, the first endpoint A1 of the inner arc segment 161 and the first endpoint B1 of the outer arc segment 162 coincide, and the second endpoint A2 of the inner arc segment 161 and the second endpoint B2 of the outer arc segment 162 coincide, so that the projection shape of the inner arc segment 161 and the outer arc segment 162 on the horizontal plane is crescent-shaped.

[0070] like Figure 5 As shown, the height difference between the center point A of the inner arc segment 161 and the center point B of the outer arc segment 162 is h1; the height difference between the first endpoint A1 of the inner arc segment 161 or the first endpoint B1 of the outer arc segment 162 and the center point B of the outer arc segment 162 is h2; h2 and h1 are multiples of each other.

[0071] In this embodiment, the height difference h2 between the first endpoint A1 of the inner arc segment 161 or the first endpoint B1 of the outer arc segment 162 and the center point B of the outer arc segment 162 is a multiple of the height difference h1 between the center point A of the inner arc segment 161 and the center point B of the outer arc segment 162. In other words, there is a certain height difference between the middle parts of the outer arc segment 162 and the inner arc segment 161. This setting ensures smoother airflow.

[0072] like Figure 7 As shown, the width difference between the center point A of the inner arc segment 161 and the center point B of the outer arc segment 162 is i, where 20mm≤i≤30mm.

[0073] In this embodiment, it is understood that the inner arc segment 161 and the outer arc segment 162 are not on the same plane. The inner arc segment 161 and the outer arc segment 162 have a certain width so that the surface of the tangent edge 160 is an arc surface, which ensures smoother airflow and reduces wind resistance. Specifically, the width difference between the center point A of the inner arc segment 161 and the center point B of the outer arc segment 162 is i, 20mm≤i≤30mm. In this way, the thickness of the tangent edge 160 is more reasonable, with fewer vortices and increased air intake.

[0074] like Figure 5 As shown, the angle between the origin O of the coordinate system and the first endpoint A1 and the second endpoint A2 of the inner circular arc segment 161 is α, where 90°≤α≤100°.

[0075] In this embodiment, the angle between the origin of the coordinate system O and the first endpoint A1 and the second endpoint A2 of the inner arc segment 161 is α. Since the first endpoint A1 of the inner arc segment 161 coincides with the first endpoint B1 of the outer arc segment 162, and the second endpoint A2 of the inner arc segment 161 coincides with the second endpoint B2 of the outer arc segment 162, the angle between the origin of the coordinate system O and the first endpoint B1 and the second endpoint B2 of the outer arc segment 162 is also α, 90°≤α≤100°. With this structural arrangement, the length of the tangent edge 160 can be reasonably determined, ensuring the proportion of the tangent edge 160 in the front cover plate 110, thereby ensuring smoother air intake of the volute 100.

[0076] like Figure 6 As shown, the intersection point of the vertical line passing through the origin O and the inner circular arc segment 161 is C, and the distance from the origin O to the intersection point C is d1. A line segment tangent to the forward air inlet 111 is drawn from the intersection point C, with the point of tangency being D, and the distance from the origin O to the point of tangency D is r2. The angle between line segment OC and line segment OD is β, and the relationship between line segment OC and line segment OD satisfies: r2=d1﹒ cosβ, where 32°≤β≤45°.

[0077] In this embodiment, the distance from the origin O to the tangent point D is r2, that is, the radius of the forward air inlet 111 is r2. The relationship between line segment OC and line segment OD satisfies: r2=d1﹒ cosβ, where 32°≤β≤45°. By constructing the expressions for line segment OC and line segment OD, the relationship between the radius of the forward air inlet 111 and the inner arc segment 161 of the tangent edge 160 can be obtained, thereby facilitating the optimized design of the tangent edge 160, effectively reducing wind resistance, increasing the air intake of the volute 100, reducing vortices, and reducing wind noise.

[0078] like Figure 6 As shown, the volute 100 has a volute tongue 170, the radius of which is r3, r3 = 0.05·(r2-2).

[0079] In this embodiment, the relationship between the radius r3 of the volute tongue 170 and the radius r2 of the air inlet is: r3 = 0.05 * (r2 - 2). This setting optimizes the size of the volute tongue 170, which can prevent the gas from circulating back and forth inside the volute housing 100, optimize the flow path of the gas inside the volute housing 100, reduce vortices and impacts in the gas flow, improve the flow efficiency of the gas, and further reduce the wind noise of the volute housing 100.

[0080] like Figure 6 As shown, the first end point of the volute tongue 170 is E1, the second end point of the volute tongue 170 is E2, the first end point E1 of the volute tongue 170 is close to the air outlet 150, the second end point E2 of the volute tongue 170 is far away from the air outlet 150, and the distance from the second end point E2 of the volute tongue 170 to the forward air inlet 111 is d2, d2 = 0.06·(r2-2).

[0081] In this embodiment, the distance d2 from the second end point E2 of the volute tongue 170 to the forward air inlet 111 and the radius r2 of the air inlet satisfy the following relationship: d2 = 0.06·(r2-2), so that the distance d2 from the second end point E2 of the volute tongue 170 to the forward air inlet 111 is more reasonable, optimizing the flow path of gas inside the volute 100, reducing vortices and impacts in the gas flow, and further reducing wind noise inside the volute 100.

[0082] like Figure 6 As shown, the intersection points of the horizontal line passing through the origin O and the front cover plate 110 are F and G, the distance of line segment FG is t1, the air outlet 150 has a first point H and a second point I, the distance of line segment HI is t2, and the relationship between the distance t1 of line segment FG and the distance t2 of line segment HI satisfies: 1.5≤t2 / t1≤1.8.

[0083] In this embodiment, the relationship between the distance t1 of line segment FG and the distance t2 of line segment HI is optimized to 1.5≤t2 / t1≤1.8. In other words, the air outlet section of the volute 100 is optimized to ensure the air outlet performance of the air outlet section of the volute 100 and reduce wind noise.

[0084] like Figure 9-13As shown in one embodiment, the volute 100 further includes a front air guide ring 180 and a rear air guide ring 190. The front air guide ring 180 is installed on the front air inlet 111. The front air guide ring 180 includes an annular air guide portion 181 and a mounting portion 182 disposed on the outer edge of the annular air guide portion 181. The longitudinal section of the annular air guide portion 181 includes an interconnected oblique line segment 1811 and a front arc segment 1812. The front arc segment 1812 extends along the air intake direction of the front air inlet 111. The rear air guide ring 190 is connected to the rear air inlet 121. The longitudinal section of the rear air guide ring 190 includes a rear arc segment 191. The rear arc segment 191 extends along the air intake direction of the rear air inlet 121. The front air guide ring 180 includes an annular air guide portion 181 and a mounting portion 182 disposed on the outer edge of the annular air guide portion 181. The longitudinal section of the annular air guide portion 181 includes an interconnected oblique line segment 1811 and a front arc segment 1812. The front arc segment 1812 extends along the air intake direction of the front air inlet 111. The front air guide ring 180 can be mounted on the front cover plate 110 of the volute 100 through the mounting portion 182. An air guide port is formed inside the annular air guide portion 181. When the front air guide ring 180 is mounted on the front air inlet 111 of the front cover plate 110, the air guide port and the front air inlet 111 of the front cover plate 110 are connected. It can also be understood that the front air inlet 111 coincides with the air guide port of the front air guide ring 180. The air intake direction of the front air inlet 111 is the direction from the front air guide ring 180 toward the interior of the volute 100 structure. Since the longitudinal section of the annular air guide 181 includes interconnected oblique line segments 1811 and arc segments, the oblique line segments 1811 are connected to the mounting part 182, and the arc segments extend along the air inlet direction of the air guide. When the fan is working, the air first flows along the oblique line segments 1811, then smoothly transitions to the arc segments, and is then guided into the volute 100 cavity of the volute 100 structure through the arc segments. In this way, the air guide of the front air guide ring 180 is smoother through the oblique line segments 1811 and the arc segments, avoiding the generation of vortices in the volute 100 structure, thereby reducing noise. Furthermore, since the air flows smoothly into the volute 100 along the oblique line segments 1811 and the arc segments, wind loss is greatly reduced. The longitudinal section of the rear air guide ring 190 includes a rear arc section 191, which extends along the air intake direction of the rear air inlet 121. The air intake direction of the rear air inlet 121 is from the rear air inlet 121 toward the volute cavity of the volute 100 structure. The rear air inlet 121 serves as a secondary air inlet, and the rear arc section 191 ensures smooth air intake from the rear air inlet 121.

[0085] like Figure 9-13As shown in the illustration, in one embodiment, the front arc segment 1812 includes a first arc 1813 and a second arc 1814. One side of the first arc 1813 is connected to the oblique line segment 1811, and the second arc 1814 is connected to the side of the first arc 1813 away from the oblique line segment 1811. Furthermore, the oblique line segment 1811 is tangent to the first arc 1813, and the first arc 1813 is tangent to the second arc 1814. The radius of the first arc 1813 is 12mm-18mm; the radius of the second arc 1814 is 3mm-5mm. The arc segment includes a first arc 1813 and a second arc 1814, where the first arc 1813 is a larger arc and the second arc 1814 is a smaller arc. The wind flows through the oblique segment 1811 first through the larger arc, i.e., the first arc 1813, thus guiding the wind into the inlet 111. Then, it flows through the smaller arc, i.e., the second arc 1814, to guide the wind to a deeper level. The second arc 1814 guides the wind into the interior of the volute 100 structure, making the airflow smoother, reducing wind loss, and preventing the formation of vortices at the inlet 111 of the volute 100, thus reducing noise.

[0086] like Figure 9-13 As shown in the illustration, in one embodiment, the oblique segment 1811 is inclined, tilting upwards towards the front air inlet 111; the angle between the oblique segment 1811 and the horizontal line is 170°-175°. The oblique segment 1811 tilts upwards towards the front air inlet 111, and combined with the arc segment extending along the air intake direction of the front air inlet 111, during airflow guidance, the air first flows slightly upwards, then flows through the arc segment into the interior of the front air inlet 111. This results in a smoother airflow trajectory, thus ensuring smoother airflow guidance. Furthermore, by limiting the angle between the oblique segment 1811 and the horizontal line to 170°-175°, it is ensured that the oblique segment 1811 tilts slightly upwards towards the front air inlet 111, thereby ensuring smoother airflow guidance.

[0087] like Figure 9-13 As shown in one embodiment, the mounting portion 182 includes a connecting section 1821 and a bending section 1822. One side of the connecting section 1821 is connected to the side of the oblique line segment 1811 away from the first arc 1813. The bending section 1822 is connected to the side of the connecting section 1821 away from the oblique line segment 1811. The bending section 1822 bends towards the air intake direction of the front air inlet 111. The front air guide ring 180 is mounted on the front air inlet 111 of the front cover plate 110 through the mounting portion 182. The bending section 1822 bends towards the air intake direction of the front air inlet 111, that is, the bent part bends towards the front cover plate 110 of the volute 100 structure, so that the bent part is in close contact with the front cover plate 110, ensuring that the front air guide ring 180 is installed tightly.

[0088] Example 2:

[0089] like Figure 8 As shown, this embodiment provides a fan, including a volute 100 and an impeller 200 as described in Embodiment 1; the impeller 200 is installed inside the volute cavity 140 of the volute 100.

[0090] In this embodiment, the fan passes through the volute 100 of Embodiment 1. When the fan is running, the air enters the volute cavity 140 along the tangent edge 160 of the volute 100, and then flows from the volute cavity 140 to the air outlet 150, making the airflow smoother, reducing vortices, thereby increasing the air intake volume of the fan, reducing fan noise, and thus improving the fan's performance. When this fan is applied to a range hood, the oil on the volute 100 can flow along the tangent edge 160 into the oil guide groove inside the range hood, greatly improving the oil guiding effect of the range hood.

[0091] like Figure 14-17As shown in the figure, in one embodiment, the impeller 200 includes a base 210 and a plurality of blades 220. The plurality of blades 220 are embedded in the base 210 and are evenly spaced around the periphery of the base 210 to form a circular array. A flow channel 230 is formed between two adjacent blades 220. The end of the flow channel 230 near the center of the circular array is the inlet end 231, and the end of the flow channel 230 away from the center of the circular array is the outlet end 232. Fluid (e.g., air) flows from the inlet end 231 to the outlet end 232 in the flow direction of the flow channel 230, and the flow channel 230 gradually narrows from the inlet end 231 to the outlet end 232. The impeller 200 includes a base 210 and a plurality of blades 220. The base 210 is used to fix the blades 220 and provide support for them. The projection of the base 210 on the water surface is circular. Therefore, the blades 220 are evenly spaced around the periphery of the base 210, forming a circular array of blades 220 around the periphery of the base 210. The blades 220 in the circular array facilitate airflow and increase the outlet air pressure. It can be understood that the periphery of the base 210 is surrounded by the blades 220, and the two ends of the base 210 have air inlet openings. A flow channel 230 is formed between adjacent blades 220. When the impeller 200 is working, air enters the interior of the base 210 from the openings at both ends of the base 210. The air is then discharged from the flow channel 230 between the blades 220. In this embodiment, the end of the flow channel 230 near the center of the circular array is defined as the inlet end 231, and the end of the flow channel 230 away from the center of the circular array is defined as the outlet end 232. The air entering the interior of the substrate 210 flows from the inlet end 231 of the flow channel 230 to the outlet end 232 of the flow channel 230, thus achieving air discharge. Since the flow channel 230 gradually narrows from the inlet end 231 to the outlet end 232, that is, the flow channel 230 gradually shrinks from the inlet end 231 to the outlet end 232, when the air is discharged from the flow channel 230, the air pressure and airflow speed continuously increase, ensuring the air volume, thereby eliminating the vortex area in the flow channel 230 and reducing wind noise.

[0092] like Figure 14-17As shown in the figure, in one embodiment, the base 210 includes an upper plate 211, a middle plate 212 and a lower plate 213. The upper plate 211 and the lower plate 213 are circular rings of the same size. A plurality of blades 220 are inserted on the middle plate 212. The two ends of the plurality of blades 220 are respectively riveted and fixed to the upper plate 211 and the lower plate 213. The base 210 includes an upper plate 211, a middle plate 212, and a lower plate 213. The upper plate 211 and lower plate 213 are located above and below the middle plate 212, respectively. Several blades 220 are inserted into the middle plate 212, and the two ends of each blade 220 are riveted to the upper plate 211 and lower plate 213 to form a single unit. The upper plate 211 and lower plate 213 are circular rings of the same size, thus serving as the inlet for the impeller 200. When the impeller 200 is operating, air enters the interior of the impeller 200 through the upper plate 211 and lower plate 213, and then exits through the flow channel 230 between the blades 220. Furthermore, the base 210, comprising the upper plate 211, middle plate 212, and lower plate 213, ensures the integrity and mechanical strength of the impeller 200, thereby guaranteeing its performance.

[0093] like Figure 14-17 As shown, in one embodiment, the cross-section of the blade 220 is arc-shaped, and the ratio of the radius of the blade 220 to the outer arc diameter of the annulus is 0.03-0.06. The arc shape of the blade 220 and the ratio of its radius to the diameter of the annulus (0.03-0.06) limit the relationship between the radius of the blade 220 and the diameter of the annulus, causing the flow channel 230 between adjacent blades 220 to gradually narrow from the inlet end 231 to the outlet end 232. This continuously increases the wind pressure and airflow velocity, ensuring sufficient airflow and eliminating vortex areas in the flow channel 230, thus reducing wind noise. Example 3:

[0094] This embodiment provides a range hood, including the fan from Embodiment 2.

[0095] In this embodiment, the range hood utilizes the fan of Embodiment Two. During operation, the airflow within the fan is smoother, reducing vortices and fan noise, thereby improving the range hood's smoke extraction efficiency and noise level, thus enhancing the overall performance and user experience. Furthermore, the fan of Embodiment Two ensures effective oil drainage, further improving the user experience.

[0096] The above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although the utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of this technical solution, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A volute, characterized in that, include: A front cover (110) is provided with a front air inlet (111); The rear cover (120) is provided with a rear air inlet (121); A ring wall (130) is connected between the front cover plate (110) and the rear cover plate (120). The front cover plate (110), the ring wall (130) and the rear cover plate (120) enclose a volute cavity (140), and an air outlet (150) is formed at the free end of the ring wall (130). Both the front cover plate (110) and the rear cover plate (120) are provided with slits (160). The slits (160) on the front cover plate (110) and the rear cover plate (120) are arranged opposite to each other, and the slits (160) are inclined toward the annular wall (130). When the volute (100) is inlet, the air flows into the volute cavity (140) along the slits (160) of the front cover plate (110) and / or the rear cover plate (120) and flows out from the air outlet (150).

2. The volute according to claim 1, characterized in that, The connection points between the front cover plate (110) and the rear cover plate (120) and the cut edge (160) are all rounded, with a radius of r1, where 10mm ≤ r1 ≤ 20mm.

3. The volute according to claim 1 or 2, characterized in that, The surface of the cut edge (160) is an arc surface; the profile of the cut edge (160) is formed by connecting the inner arc segment (161) and the outer arc segment (162), and the projection shape of the inner arc segment (161) and the outer arc segment (162) on the horizontal plane is crescent-shaped.

4. The volute according to claim 3, characterized in that, In the profile of the volute (100), the center of the front air inlet (111) is taken as the origin O, the center point of the outer arc segment (162) is B, and the center point B of the outer arc segment (162) is offset from the origin O towards the air outlet (150).

5. The volute according to claim 4, characterized in that, The center point of the inner arc segment (161) is A, the first endpoint of the inner arc segment (161) is A1, and the second endpoint of the inner arc segment (161) is A2; The center point of the outer arc segment (162) is B, the first endpoint of the outer arc segment (162) is B1, and the second endpoint of the outer arc segment (162) is B2. The first endpoint A1 of the inner arc segment (161) coincides with the first endpoint B1 of the outer arc segment (162), and the second endpoint A2 of the inner arc segment (161) coincides with the second endpoint B2 of the outer arc segment (162).

6. The volute according to claim 5, characterized in that, The height difference between the center point A of the inner arc segment (161) and the center point B of the outer arc segment (162) is h1; the height difference between the first endpoint A1 of the inner arc segment (161) or the first endpoint B1 of the outer arc segment (162) and the center point B of the outer arc segment (162) is h2; h2 and h1 are multiples of each other; And / or, the width difference between the center point A of the inner arc segment (161) and the center point B of the outer arc segment (162) is i, 20mm≤i≤30mm.

7. The volute according to claim 5, characterized in that, The angle between the origin O of the coordinate system and the first endpoint A1 and the second endpoint A2 of the inner circular arc segment (161) is α, where 90°≤α≤100°.

8. The volute according to claim 4, characterized in that, The intersection point of the vertical line passing through the origin O and the inner circular arc segment (161) is C, and the distance from the origin O to the intersection point C is d1; Draw a line segment from the intersection point C that is tangent to the forward air inlet (111), with the point of tangency being D, and the distance from the origin O to the point of tangency D being r2; The angle between line segment OC and line segment OD is β. The relationship between line segment OC and line segment OD satisfies: r2=d1﹒ cosβ, where 32°≤β≤45°.

9. The volute according to claim 8, characterized in that, The volute (100) has a volute tongue (170) with a radius of r3, r3 = 0.05 (r2-2).

10. The volute according to claim 9, characterized in that, The first end point of the volute tongue (170) is E1, the second end point of the volute tongue (170) is E2, the first end point E1 of the volute tongue (170) is close to the air outlet (150), the second end point E2 of the volute tongue (170) is far away from the air outlet (150), and the distance from the second end point E2 of the volute tongue (170) to the forward air inlet (111) is d2, d2 = 0.06·(r2-2).

11. The volute according to claim 4, characterized in that, The horizontal line passing through the origin O intersects the front cover (110) at points F and G, and the distance of line segment FG is t1. The air outlet (150) has a first point H and a second point I, and the distance of line segment HI is t2. The relationship between the distance t1 of line segment FG and the distance t2 of line segment HI satisfies: 1.5≤t2 / t1≤1.

8.

12. A fan, characterized in that, include: The volute (100) according to any one of claims 1-11; Impeller (200), the impeller (200) is installed in the volute cavity (140) of the volute (100).

13. A range hood, characterized in that, Includes the wind turbine as described in claim 12.

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