Air outlet base, fan assembly and range hood

Abstract

The present invention provides an air outlet seat, a fan assembly and a range hood, which relate to the technical field of kitchen equipment. The air outlet seat comprises a seat body, in which a first fluid channel and a second fluid channel are sequentially arranged along the flow direction of smoke; the air inlet of the first fluid channel gradually and smoothly transitions to the air outlet with a first change amplitude, and the air inlet of the second fluid channel gradually and smoothly transitions to the air outlet with a second change amplitude, so that the smoke can gradually change in the first fluid channel and the second fluid channel, reducing the impact of the smoke on the air outlet seat; the position where the exhaust port of the first fluid channel is connected to the air inlet of the second fluid channel forms a transition mark in the circumferential direction, that is, the air outlet seat forms two sections of fluid channels with different gradual amplitudes along the flow direction of smoke, which can be better adapted to the flow of smoke at different stages, reduce the impact of smoke on the air outlet seat, improve the smoke exhaust effect, and enhance the customer experience.

Description

Technical Field

[0001] The present invention relates to the technical field of kitchen equipment, and in particular to an air outlet seat, a fan assembly and a range hood. Background Art

[0002] A range hood is a common kitchen appliance that users use to remove smoke generated during cooking. A range hood includes a casing, a volute fan, a smoke hood, and other components. The volute fan is installed in the casing, and a smoke inlet and a smoke exhaust outlet are provided on the casing. The smoke hood is installed at the smoke inlet. The smoke exhaust outlet of the casing is connected to an air outlet seat, and the smoke exhaust outlet of the volute fan is connected to the smoke exhaust pipe through the air outlet seat.

[0003] Existing side-suction range hoods have a tilted volute fan and a vertically positioned exhaust duct. Furthermore, the volute fan's exhaust port is square, while the exhaust pipe's inlet is circular. As a result, smoke is forced to flow vertically and circularly after exiting the square volute fan's tilted port. This unsmooth transition can lead to significant exhaust resistance, affecting exhaust efficiency and the user experience. Summary of the Invention

[0004] The purpose of the present invention is to provide an air outlet seat, a fan assembly and a range hood to solve the technical problem in the prior art that smoke is forced to convert into a vertical circular flow after flowing out obliquely from the square opening of the volute fan, which easily leads to a large exhaust wind resistance.

[0005] The air outlet seat provided by the present invention is used to connect between the smoke exhaust port of the volute and the smoke exhaust pipe, and includes a seat body, in which a first fluid channel and a second fluid channel are sequentially provided along the flow direction of the smoke;

[0006] The air inlet of the first fluid channel is suitable for matching with the square smoke exhaust port of the volute. The cross-section of the first fluid channel gradually and smoothly transitions from the cross-section corresponding to the air inlet of the first fluid channel to the cross-section corresponding to the air exhaust port of the first fluid channel at a first variation amplitude along the flow direction of the smoke. The air exhaust port of the first fluid channel is aligned, connected and connected with the air inlet of the second fluid channel. The cross-section of the second fluid channel gradually and smoothly transitions from the cross-section corresponding to the air inlet of the second fluid channel to the cross-section corresponding to the air exhaust port of the second fluid channel at a second variation amplitude along the flow direction of the smoke. The air exhaust port of the second fluid channel is suitable for matching with the smoke inlet of a circular smoke exhaust pipe.

[0007] A transition line is formed in the circumferential direction of the second fluid channel at a position where the air outlet of the first fluid channel is connected to the air inlet of the second fluid channel.

[0008] As an optional solution of the present invention, the side wall of the first fluid channel includes a first side a, a first side b, a first side c, and a first side d connected in sequence, and the side wall of the second fluid channel includes a second side a, a second side b, a second side c, and a second side d connected in sequence;

[0009] The first side a is correspondingly arranged above the circumference of the volute opposite to the volute tongue, and the lower edge of the second side a is aligned and connected with the upper edge of the first side a to form a first transition mark;

[0010] The first c-side surface is correspondingly arranged above the circumference of the volute provided with the volute tongue, and the lower edge of the second c-side surface is aligned and connected with the upper edge of the first c-side surface to form a third transition mark;

[0011] The first b side and the first d side are respectively arranged above the two side plates of the volute, and the lower edge of the second b side is aligned and connected with the upper edge of the first b side to form a second transition mark; the lower edge of the second d side is aligned and connected with the upper edge of the first d side to form a fourth transition mark.

[0012] As a further embodiment of the present invention, the first side a is concave inwardly in an arc shape from bottom to top, and the second side a is perpendicular to the plane where the smoke outlet of the volute is located in the vertical direction;

[0013] The first c-side surface is gradually protruded outward from bottom to top, and the second c-side surface is gradually inclined outward away from the center of the second fluid channel from bottom to top.

[0014] As a further solution of the present invention, along the direction from bottom to top: the first a side, the second a side, the first c side and the second c side all extend smoothly, and the change amplitude of the first a side in the radial direction of the first fluid channel is greater than the change amplitude of the second a side in the radial direction of the second fluid channel, and the change amplitude of the first c side in the radial direction of the first fluid channel is greater than the change amplitude of the second c side in the radial direction of the second fluid channel.

[0015] As a further solution of the present invention, the first side a and the first side c are arcuate surfaces convex outward along the circumference of the first fluid channel, and the second side a and the second side c are arcuate surfaces convex outward along the circumference of the second fluid channel.

[0016] As a further solution of the present invention, the first b side, the second b side, the first d side and the second d side are all flat plates, the first b side and the first d side are both arranged perpendicular to the plane where the smoke exhaust port of the volute is located, and the second b side and the second d side are arranged close to each other and inwardly inclined.

[0017] As a further solution of the present invention, the inclination angle of the second side surface b and / or the second side surface d is not greater than 5 degrees.

[0018] As a further solution of the present invention, the height from the upper end to the lower end of the air outlet seat is greater than the distance between the first b side and the first d side, and the distance between the first b side and the first d side is greater than the maximum width of the smoke exhaust port of the volute.

[0019] As a further solution of the present invention, along the direction from bottom to top: the lengths of the second side a and the second side c along the circumference of the second fluid channel are gradually extended, and the lengths of the second side b and the second side d along the circumference of the second fluid channel are gradually shortened.

[0020] As a further solution of the present invention, the lower end of the first side a is tangentially transitionally connected to the upper side of the enclosure opposite to the volute tongue of the volute.

[0021] As a further solution of the present invention, the lower ends of the first side a, the first side b, the first side c and the first side d are sequentially arranged into a square, so that the air inlet of the first fluid channel is a square that matches the smoke exhaust port of the volute.

[0022] As a further solution of the present invention, the outer peripheral surface of the lower end of the seat body is connected to a connecting portion for connecting to the top plate of the volute, and the upper end of the seat body is connected to a circular outlet joint.

[0023] The fan assembly provided by the present invention comprises a volute and an air outlet seat provided by the present invention connected to the smoke exhaust port of the volute.

[0024] As a further solution of the present invention, a volute tongue assembly is installed at the volute tongue position of the volute enclosure;

[0025] The volute tongue assembly includes a front guide surface, a noise reduction groove and a rear guide surface arranged in sequence along the up and down directions, and the front guide surface and the rear guide surface are arranged facing the flue gas flow passage of the volute.

[0026] Specifically, the rear guide surface is arranged in an arc shape along the width direction of the enclosure and away from the flue gas flow channel depression, and the front guide surface is arranged in an arc shape along the width direction of the enclosure and away from the flue gas flow channel depression.

[0027] Specifically, the front guide surface is arranged in an arc shape convex toward the flue gas flow passage along the up-down direction, and the rear guide surface is arranged in an arc shape concave away from the flue gas flow passage along the up-down direction.

[0028] Specifically, the rear guide surface is arranged in an arc shape along the width direction of the enclosure, and the midpoint of the arc shape of the rear guide surface deviates from the center of the width direction of the enclosure;

[0029] and / or;

[0030] The front guide surface is arranged in the form of a saddle surface.

[0031] Specifically, the edge of the front guide surface close to the rear guide surface is the first edge, and the edge of the rear guide surface close to the front guide surface is the second edge;

[0032] The opposite side walls of the noise reduction groove are connected to the first edge and the second edge respectively, and the noise reduction groove is recessed outward relative to the first edge and the second edge away from the flue gas flow channel.

[0033] Specifically, along the extension direction of the first edge, the noise reduction groove is provided through;

[0034] and / or;

[0035] The cross section of the noise reduction groove is V-shaped.

[0036] Specifically, the volute assembly includes a main body shell, the main body shell is arranged in an open groove shape, the bottom wall of the main body shell is arranged facing the flue gas flow channel on a side away from the interior of the main body shell, and the front guide surface, the noise reduction groove and the rear guide surface are formed on the bottom wall of the main body shell;

[0037] The opening of the main body shell faces the enclosure, and the main body shell side wall of the main body shell is used to fit with the enclosure.

[0038] Specifically, the volute tongue assembly is detachably connected to the enclosure.

[0039] Specifically, a connecting column is provided on a side of the bottom wall of the main body shell facing the interior of the main body shell, and the connecting column is used to be connected to the enclosure plate.

[0040] The range hood provided by the present invention includes the fan assembly provided by the present invention.

[0041] The air outlet seat provided by the present invention is used to connect between the smoke outlet of the volute and the smoke exhaust pipe to guide the smoke from the smoke outlet of the volute into the smoke exhaust pipe. The air outlet seat includes a seat body, in which a first fluid channel and a second fluid channel are sequentially arranged along the flow direction of the smoke; the air inlet of the first fluid channel is suitable for matching the square air outlet of the volute, and the cross-section of the first fluid channel gradually changes from the cross-section corresponding to the air inlet of the first fluid channel to the cross-section corresponding to the air outlet of the first fluid channel in a first variation range along the flow direction of the smoke, and the air outlet of the first fluid channel is aligned, connected and connected with the air inlet of the second fluid channel, and the cross-section of the second fluid channel gradually changes from the cross-section corresponding to the air inlet of the second fluid channel to the cross-section corresponding to the air outlet of the second fluid channel in a second variation range along the flow direction of the smoke, and the air outlet of the second fluid channel is suitable for matching the smoke inlet of the circular smoke exhaust pipe. The air inlet and outlet of the first fluid channel transition gradually and smoothly with a first amplitude, while the air inlet and outlet of the second fluid channel transition gradually and smoothly with a second amplitude, allowing the smoke to gradually change within the first and second fluid channels, reducing the impact of the smoke on the outlet seat, reducing wind resistance and noise, and improving the exhaust effect. The location where the exhaust port of the first fluid channel connects to the air inlet of the second fluid channel forms a transition line on the circumference of the second fluid channel, indicating that the first amplitude and the second amplitude are different. The outlet seat forms two fluid channels with different gradual amplitudes along the direction of smoke flow, thereby better adapting to different stages of smoke flow, reducing the impact of smoke on the outlet seat, improving the exhaust effect, and enhancing the customer experience.

[0042] The fan assembly provided by the present invention comprises a volute and an air outlet seat provided by the present invention connected to the smoke outlet of the volute. The beneficial effects achieved by the fan assembly of the present invention include at least the beneficial effects achieved by the air outlet seat provided by the present invention, which will not be repeated here.

[0043] The range hood provided by the present invention includes the fan assembly provided by the present invention. The beneficial effects of the range hood provided by the present invention are the same as those of the fan assembly and the air outlet seat provided by the present invention, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0045] Figure 1 A schematic diagram of a volute tongue assembly provided in an embodiment of the present invention;

[0046] Figure 2 A schematic diagram of a volute provided in an embodiment of the present invention;

[0047] Figure 3 A schematic diagram of the assembly process of the volute tongue assembly and the enclosure provided in an embodiment of the present invention;

[0048] Figure 4 A schematic diagram of a volute tongue assembly provided by an embodiment of the present invention from one viewing angle;

[0049] Figure 5 A schematic diagram showing a perspective of a volute tongue assembly provided by an embodiment of the present invention installed on a panel;

[0050] Figure 6 for Figure 5 Schematic diagram after changing the perspective;

[0051] Figure 7 A partial schematic diagram of a volute provided in an embodiment of the present invention;

[0052] Figure 8 A schematic diagram of a fan assembly provided in an embodiment of the present invention having an impeller mounted on a volute;

[0053] Figure 9 A schematic diagram of an air outlet seat provided in an embodiment of the present invention;

[0054] Figure 10 for Figure 9 Schematic diagram after changing the perspective;

[0055] Figure 11 for Figure 10 A side view schematic diagram of

[0056] Figure 12 for Figure 10 The main schematic diagram of

[0057] Figure 13 A schematic diagram of a fan assembly provided by an embodiment of the present invention from one perspective;

[0058] Figure 14 for Figure 13 Schematic diagram after changing the perspective;

[0059] Figure 15 for Figure 14 The internal schematic diagram of the fan assembly is shown;

[0060] Figure 16 A schematic diagram of the actual installation of a fan assembly provided by an embodiment of the present invention;

[0061] Figure 17 This is a schematic diagram of the interior of a range hood provided by an embodiment of the present invention.

[0062] Icons: 10-volute; 11-smoke exhaust port; 12-enclosure; 121-arc surface; 122-enclosure plane; 13-side panel; 20-volute tongue assembly; 21-front guide surface; 211-first edge; 22-rear guide surface; 221-second edge; 23-noise reduction groove; 24-connecting column; 241-first connecting column; 242-second connecting column; 243-third connecting column; 251-first hole position; 252-second hole position; 253-third hole position; 26-bottom wall; 27-side wall of main body shell; 30-air outlet seat; 31-air inlet; 32-air outlet; 33-first fluid channel; 331-first a side; 332-first b side; 333-first c side; 334- First d side; 341-first ridge line; 342-second ridge line; 343-third ridge line; 344-fourth ridge line; 35-second fluid channel; 351-second a side; 352-second b side; 353-second c side; 354-second d side; 361-fifth ridge line; 362-sixth ridge line; 363-seventh ridge line; 364-eighth ridge line; 371-first transition mark; 372-second transition mark; 373-third transition mark; 374-fourth transition mark; 40-impeller; 50-flue gas; 60-fluid channel; 61-first wall; 62-second wall; 63-third wall; 64-fourth wall; 71-connecting part; 72-outlet joint. DETAILED DESCRIPTION

[0063] The following will clearly and completely describe the technical solutions of the present invention in conjunction with the embodiments. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0064] Example

[0065] The volute of the existing side-suction range hood is placed at an angle, while the air outlet seat (or check valve seat) is placed vertically. After the airflow flows out of the volute at an angle, it is forced to flow vertically. This unsmooth transition increases the exhaust wind resistance and noise.

[0066] Regarding this issue, Figures 1 to 17 As shown, this embodiment provides an air outlet seat 30, in which a fluid channel 60 is provided. The air inlet 31 of the fluid channel 60 is correspondingly connected to the smoke exhaust port 11 of the volute 10, and the air outlet 32 of the fluid channel 60 is used to connect to the smoke exhaust pipe.

[0067] The air outlet seat 30 includes a seat body, and the fluid channel 60 in the seat body includes a first fluid channel 33 and a second fluid channel 35 in sequence along the flow direction of the smoke 50. The air inlet 31 of the first fluid channel 33 is suitable for matching with the square smoke exhaust port 11 of the volute 10. The cross-section of the first fluid channel 33 gradually and smoothly transitions from the cross-section corresponding to the air inlet 31 of the first fluid channel 33 to the cross-section corresponding to the exhaust port of the first fluid channel 33 at a first variation amplitude along the flow direction of the smoke 50. The exhaust port of the first fluid channel 33 is aligned, connected and connected with the air inlet of the second fluid channel 35. The cross-section of the second fluid channel 35 gradually and smoothly transitions from the cross-section corresponding to the air inlet of the second fluid channel 35 to the cross-section corresponding to the exhaust port 32 of the second fluid channel 35 at a second variation amplitude along the flow direction of the smoke 50. The exhaust port 32 of the second fluid channel 35 is suitable for matching with the smoke inlet of the circular smoke exhaust pipe. A transition line is formed in the circumferential direction of the second fluid channel 35 at a position where the air outlet of the first fluid channel 33 is connected to the air inlet of the second fluid channel 35 .

[0068] In this embodiment, the air outlet seat 30 is connected between the smoke outlet 11 of the volute 10 and the smoke exhaust pipe to guide the smoke 50 from the smoke outlet 11 of the volute 10 into the smoke exhaust pipe. The air inlet 31 of the first fluid channel 33 transitions smoothly from the air outlet to the exhaust port at a first amplitude, while the air inlet and exhaust port 32 of the second fluid channel 35 transition smoothly at a second amplitude. This allows the smoke 50 to gradually change within the first and second fluid channels 33 and 35, minimizing the impact of the smoke 50 on the air outlet seat 30, reducing wind resistance and noise, and improving the smoke exhaust effect. Among them, the position where the exhaust port of the first fluid channel 33 is connected to the air inlet of the second fluid channel 35 forms a transition mark in the circumferential direction of the second fluid channel 35, indicating that the first change amplitude is different from the second change amplitude, that is, the change amplitudes of the positions corresponding to the first fluid channel 33 and the second fluid channel 35 along the direction of smoke flow are different, and the air outlet seat 30 forms two upper and lower sections of fluid channels 60 with different gradient amplitudes, so it can be better adapted to the flow of smoke 50 at different stages, reduce the impact of smoke 50 on the air outlet seat 30, improve the smoke exhaust effect, and enhance the customer experience.

[0069] Typically, the smoke flow direction of the outlet seat 30 is from bottom to top. In this embodiment, the direction from bottom to top is also the smoke flow direction. For ease of description, the corresponding components of the first fluid channel 33 and the second fluid channel 35 are described in an up-down orientation. When the outlet seat 30 is not arranged in an up-down orientation, the lower end should be understood as the end closest to the smoke inlet, and the upper end should be understood as the end closest to the smoke outlet.

[0070] like Figures 9 to 12As shown, the sidewall of the first fluid channel 33 includes a first a-side surface 331, a first b-side surface 332, a first c-side surface 333, and a first d-side surface 334, which are sequentially connected. The sidewall of the second fluid channel 35 includes a second a-side surface 351, a second b-side surface 352, a second c-side surface 353, and a second d-side surface 354, which are sequentially connected. The first a-side surface 331 is correspondingly disposed above the shroud 12 of the volute 10, which is opposite to the volute tongue. The lower edge of the second a-side surface 351 is aligned and connected to the upper edge of the first a-side surface 331. The amplitude of the change from bottom to top along the first a-side surface 331 is different from the amplitude of the change from bottom to top along the second a-side surface 351, thereby forming a first transition mark 371. The first c-side surface 333 is positioned above the shroud 12 of the volute 10, where the volute tongue is located. The lower edge of the second c-side surface 353 is aligned with the upper edge of the first c-side surface 333. The amplitude of the first c-side surface 333 changes from bottom to top differently from that of the second c-side surface 353, forming a third transition mark 373. The first b-side surface 332 and the first d-side surface 334 are positioned above the two side panels 13 of the volute 10, respectively. The lower edge of the second b-side surface 352 is aligned with the upper edge of the first b-side surface 332. The amplitude of the first b-side surface 332 changes from bottom to top differently from that of the second b-side surface 352, forming a second transition mark 372. The lower edge of the second d-side surface 354 is aligned with the upper edge of the first d-side surface 334. The amplitude of the first d-side surface 334 changes from bottom to top differently from that of the second d-side surface 354, forming a fourth transition mark 374.

[0071] Specifically, the first a side surface 331 is concave inwardly in an arc shape from bottom to top, and the second a side surface 351 is perpendicular to the plane where the smoke outlet 11 of the volute 10 is located in the vertical direction, thereby forming different vertical variation ranges on this side. The first c side surface 333 is gradually convex outwardly in the direction from bottom to top, and the second c side surface 353 is gradually inclined outwardly away from the center of the fluid channel 60 (second fluid channel 35) from bottom to top, thereby forming different vertical variation ranges on this side. The first b side surface 332, the second b side surface 352, the first d side surface 334, and the second d side surface 354 are all flat plates. The first b side surface 332 and the first d side surface 334 are both perpendicular to the plane where the smoke outlet 11 of the volute 10 is located. The second b side surface 352 and the second d side surface 354 are close to each other and retracted and inclined, thereby forming different vertical variation ranges on both sides.

[0072] Furthermore, the first side a 331 and the first side c 333 are arcuate surfaces bulging outward along the circumference of the first fluid channel 33 , and the second side a 351 and the second side c 353 are arcuate surfaces bulging outward along the circumference of the second fluid channel 35 .

[0073] It is understood that the first a-side surface 331 and the second a-side surface 351 form the first wall surface 61 of the outlet seat 30, the first b-side surface 332 and the second b-side surface 352 form the second wall surface 62 of the outlet seat 30, the first c-side surface 333 and the second c-side surface 353 form the third wall surface 63 of the outlet seat 30, and the first d-side surface 334 and the second d-side surface 354 form the fourth wall surface 64 of the outlet seat 30. The first wall surface 61 and the third wall surface 63 are both curved plates that protrude outward along the circumference of the fluid channel 60, while the second wall surface 62 and the fourth wall surface 64 are both flat plates. It is understood that the curved shape of the first wall surface 61 facilitates the square-to-circular flow of the flue gas 50. The third wall 63 is curved to conform to the corresponding volute tongue assembly 20, while the second and fourth walls 62 and 64 continue to be flat panels to conform to the planar shape of the side panels 13 of the volute 10. This facilitates the continued flow of the smoke 50 in its original direction after exiting the smoke outlet 11 of the volute 10, reducing the impact of the smoke 50's sudden turn and reducing noise. To facilitate the transition from square to round, the first side surface a 331 is concave greater than the convexity of the first side surface c 333, causing the first fluid channel 33 to retract inward along the flow direction of the smoke 50.

[0074] Among them, along the direction from bottom to top, the first a-side 331, the second a-side 351, the first c-side 333 and the second c-side 353 all extend smoothly, and the change amplitude of the first a-side 331 in the radial direction of the first fluid channel 33 is greater than the change amplitude of the second a-side 351 in the radial direction of the second fluid channel 35, and the change amplitude of the first c-side 333 in the radial direction of the first fluid channel 33 is greater than the change amplitude of the second c-side 353 in the radial direction of the second fluid channel 35.

[0075] Specifically, the angle between the line between the upper end and the lower end of the first a-side surface 331 and the plane (roughly a horizontal plane) where the smoke outlet 11 of the volute 10 is located is smaller than the angle between the line between the upper end and the lower end of the second a-side surface 351 and the plane where the smoke outlet 11 of the volute 10 is located, that is, the change amplitude of the first a-side surface 331 in the radial direction of the fluid channel 60 along the direction of smoke flow (the change amplitude is also the inward shrinkage rate in this embodiment) is greater than the change amplitude of the second a-side surface 351 (the change amplitude is also the inward shrinkage rate, and the basic inward shrinkage rate of the second a-side surface 351 is approximately zero), thereby forming a first transition mark 371 between the first a-side surface 331 and the second a-side surface 351. The angle between the line connecting the upper end and the lower end of the first C-side surface 333 and the plane where the smoke outlet 11 of the volute 10 is located is smaller than the angle between the line connecting the upper end and the lower end of the second C-side surface 353 and the plane (horizontal plane) where the volute 10 is located, that is, the variation range of the first C-side surface 333 in the radial direction of the fluid channel 60 along the direction of smoke flow (the variation range is also the outward expansion rate in this embodiment) is greater than the variation range of the second C-side surface 353 in the radial direction of the fluid channel 60 (the variation range is also the outward expansion rate in this embodiment, refer to Figure 12 As shown, the first c-side surface 333 has a greater outward inclination than the second c-side surface 353, thereby forming a third score line between the first c-side surface 333 and the second c-side surface 353. The first transition score line 371, the second transition score line 372, the third transition score line 373, and the fourth transition score line 374 are sequentially connected to form a transition score line. The upper ends of the first a-side surface 331, the first b-side surface 332, the first c-side surface 333, and the first d-side surface 334 are aligned, forming a closed-loop transition score line at the same horizontal height. This means that the connection between the first fluid channel 33 and the second fluid channel 35 is approximately parallel to the horizontal plane.

[0076] In this embodiment, the lower end of the first side surface a 331 is tangentially transitionally connected to the upper portion of the enclosing plate 12 opposite to the volute tongue of the volute 10 .

[0077] like Figure 17As shown, the shape of the first side a 331 conforms to the direction of the enclosure 12 on the opposite side of the volute 10, which is conducive to the airflow from the volute 10 continuing to flow along the original path. Specifically, the first side a 331 of the first fluid channel 33 of the outlet seat 30 is smoothly connected to the outlet side of the enclosure 12 of the volute 10. Specifically, the connection is a tangential transition, that is, the lower end of the first side a 331 is tangentially connected to the upper side of the enclosure 12 opposite the volute tongue of the volute 10. This first maintains a distance in the direction of the smoke 50 at the smoke outlet 11 of the volute 10, preventing premature gas flow separation and reducing gas flow separation noise. It then smoothly transitions to the airflow guide surface of the second side a 351 of the second fluid channel 35, thereby guiding the inclined smoke 50 flowing out of the volute 10 upward along an arc and reducing flow resistance. Similarly, the first b-side surface 332 of the first fluid channel 33 further extends along the volute tongue of the enclosure 12, and then smoothly transitions to the airflow guide surface of the second b-side surface 352 of the second fluid channel 35, thereby smoothly guiding the inclined flue gas 50 flowing out of the volute 10 upward along an arc for discharge, uniformly expanding the pressure, reducing flow separation, and reducing the separation noise of the flue gas 50. The first c-side surface 333 and the second c-side surface 353 protrude outward, conforming to the flow of the flue gas 50 in the volute tongue assembly 20, allowing the flue gas 50 to be slowly diverted and reducing the impact of the flue gas 50. Furthermore, the flue gas 50 is first diverted more significantly by the first c-side surface 333 with a larger change amplitude, and then smoothly combed by the second c-side surface 353, which greatly alleviates the agitation of the flue gas 50.

[0078] In this example, if Figure 12 As shown, along the flow direction of the flue gas 50, the lengths of the second a-side surface 351 and the second c-side surface 353 along the circumference of the fluid channel 60 gradually increase, while the lengths of the second b-side surface 352 and the second d-side surface 354 along the circumference of the fluid channel 60 gradually decrease, to better match the circular smoke exhaust pipe. The upper end of the first a-side surface 331 is aligned with the lower end of the second a-side surface 351, and the upper end of the first c-side surface 333 is aligned with the lower end of the second c-side surface 353. The upper end of the first b-side surface 332 is aligned with the lower end of the second b-side surface 352, and the upper end of the first d-side surface 334 is aligned with the lower end of the second d-side surface 354, forming a smooth transition.

[0079] The inclination angles of the second side b 352 and the second side d 354 are both no greater than 5 degrees, and may specifically be 1 degree, 2 degrees, 3 degrees, 4 degrees, and 5 degrees.

[0080] like Figure 17 As shown, the height H from the upper end to the lower end of the air outlet seat 30 is greater than the distance D between the first b side 332 and the first d side 334, and the distance D between the first b side 332 and the first d side 334 is greater than the maximum width d of the smoke exhaust port 11 of the volute 10.

[0081] The distance D between the first b-side 332 and the first d-side 334 is also the bottom width of the air outlet seat 30. The distance D between the first b-side 332 and the first d-side 334 is greater than the maximum width d of the smoke outlet 11 of the volute 10, ensuring that the air outlet seat 30 can completely cover the smoke outlet 11 of the volute 10, facilitating a sealed connection between the air outlet seat 30 and the volute 10. The height H from the upper end to the lower end of the air outlet seat 30 is greater than the distance D between the second a-side 351 and the second b-side 352, ensuring that the smoke 50 flowing out of the smoke outlet 11 of the volute 10 at a certain angle will not directly collide with the front wall of the air outlet seat 30. Due to the increased height, the smoke 50 gradually transitions to vertical outlet within the air outlet seat 30, gently guiding the smoke 50 upward for discharge, preventing the smoke 50 from directly transitioning to vertical outlet after obliquely flowing out of the volute 10, thereby reducing flow resistance and improving air outlet efficiency.

[0082] In this embodiment, the outer peripheral surface of the lower end of the seat body is connected to a connecting portion 71 for connecting to the top plate of the volute 10 , and the upper end of the seat body is connected to a circular outlet joint 72 .

[0083] The connecting portion 71 is connected to one end of the seat body at the air inlet 31 of the fluid channel 60. The connecting portion 71 is square and is equivalent to a flange plate, which is suitable for connecting to the connecting piece of the smoke exhaust port 11 of the volute 10. The outlet joint 72 is suitable for connecting to the smoke exhaust pipe.

[0084] The lower ends of the first a-side surface 331, the first b-side surface 332, the first c-side surface 333, and the first d-side surface 334 are sequentially arranged to form a square (rectangular) shape, so that the air inlet 31 of the first fluid channel 33 is a square that matches the smoke outlet 11 of the volute 10. The air inlet 31 of the first fluid channel 33 is arranged in a square shape, and the four inner walls of the air inlet 31 of the first fluid channel 33 are smoothly connected to the four side walls of the smoke outlet 11 of the volute 10. The outlet connector 72 is arranged in a circular shape, and the inner side wall of the outlet connector 72 smoothly transitions to the upper ends of the second a-side surface 351, the second b-side surface 352, the second c-side surface 353, and the second d-side surface 354, so that the smoke 50 can flow smoothly into the smoke exhaust pipe.

[0085] The air inlet 31 and the air outlet 32 of the air outlet seat 30 of the fan assembly of this embodiment are surrounded by eight surfaces, namely the first a side 331, the second a side 351, the first b side 332, the second b side 352, the first c side 333, the second c side 353, the first d side 334, and the second d side 354. The connection between the eight curved surfaces forms eight ridge lines, namely the first ridge line 341, the second ridge line 342, the third ridge line 343, the fourth ridge line 344, the fifth ridge line 361, the sixth ridge line 362, the seventh ridge line 363 and the eighth ridge line 364. These eight ridge lines control the wall surface of the air outlet seat 30 to form a smoke guide structure; the lower end edges of the four surfaces of the first a side 331, the first b side 332, the first c side 333, and the first d side 334 correspond to the four edges of the smoke exhaust port 11 of the volute 10, the upper end edges of the four surfaces of the second a side 351, the second b side 352, the second c side 353, and the second d side 354 are segmented arcs, and the lower end edges are quadrilateral lines corresponding to the smoke exhaust port 11 of the volute 10. In addition, the first a side 331, the first b side 332, the first c side 333, and the first d side 334 are connected to the curved surfaces of the second a side 351, the second b side 352, the second c side 353, and the second d side 354 up and down, and form four transition marks. The outlet base 30 features multiple curved surfaces, forming a first fluid channel 33 for the smoke 50 to flow out of the volute 10, and a second fluid channel 35 within the cavity of the outlet base 30, which gently guides the smoke 50 upward. The smooth transition between the smoke outlet 11 of the volute 10 and the outlet base 30 reduces wind resistance, lowers noise, improves air duct efficiency, and increases exhaust pressure. This addresses the problem of existing side-suction range hoods, where the volute 10 is tilted and the outlet base 30 is vertically positioned. This forces the smoke 50 to flow vertically after exiting the volute 10. This unsmooth transition increases exhaust wind resistance and noise.

[0086] It should be noted that the air outlet seat 30 is a structure for connecting the smoke exhaust pipe and the volute 10, which can be combined with a check assembly to form a check valve. Usually, the smoke exhaust port 11 of the volute 10 is square (quadrilateral), and the cross-section of the smoke exhaust pipe is circular, so the air outlet seat 30 should be able to play a role in turning a square into a circle. In the fan assembly of this embodiment, the air outlet seat 30 has a square connection portion 71 and a circular outlet joint 72. The square air inlet 31 is used to connect to the smoke exhaust port 11 of the volute 10, and the circular air outlet 32 is used to connect to the smoke exhaust pipe, so that the air outlet seat 30 can be better connected to the volute 10 and the smoke exhaust pipe.

[0087] This embodiment further provides a fan assembly, including a volute 10 and an air outlet seat 30 provided in this embodiment and connected to the smoke exhaust port 11 of the volute 10 .

[0088] Specifically, the fan assembly also includes components such as an impeller 40 disposed within the volute 10. The volute 10 is the main body of the volute 10 fan, and includes two opposing panels 12 and two side panels 13 connected between the ends of the two panels 12. One of the panels 12 is formed with an arc surface 121 near the smoke exhaust port 11 of the volute 10. The arc surface 121 is also the volute tongue of the panel 12.

[0089] The fan assembly of this embodiment has a volute tongue assembly 20 installed at the volute tongue position of the shroud 12 of the volute 10. The volute tongue assembly 20 includes a volute tongue assembly, which is sequentially provided with a front guide surface 21 and a rear guide surface 22 along the flow direction of the flue gas 50. The front guide surface 21 and the rear guide surface 22 are both used to face the flue gas flow path of the volute 10. A noise reduction groove 23 is provided between the front guide surface 21 and the rear guide surface 22.

[0090] The front guide surface 21 and the rear guide surface 22 are used to guide the smoke 50 so that the smoke 50 can flow smoothly from the volute 10 into the air outlet seat 30 and then into the smoke exhaust pipe. The front guide surface 21 and the rear guide surface 22 can be inclined surfaces (generally flat surfaces) that play a guiding role, or they can be curved surfaces, wherein the curved surface can be arranged in an arc shape along the width direction of the enclosure 12 where the volute tongue is provided, or it can be arranged in an arc shape along the flow direction of the smoke 50, or it can be arranged in an arc shape along both directions. The shape of the front guide surface 21 and the shape of the rear guide surface 22 can be selected as needed. Both can be inclined surfaces, both can be curved surfaces, or one can be a curved surface and the other can be an inclined surface.

[0091] In the volute tongue assembly 20 of this embodiment, the front guide surface 21 and the rear guide surface 22 are both arranged facing the flue gas flow passage of the volute 10, and are arranged in sequence along the flow direction of the flue gas 50. Therefore, when the flue gas 50 forms the flue gas 50 and passes through the volute tongue assembly 20 during the flow process, it is guided by the front guide surface 21 and the rear guide surface 22 in sequence before flowing out. The guiding effect of the front guide surface 21 and the rear guide surface 22 can sort out the flow direction of the flue gas 50, thereby achieving the purpose of reducing noise. At the same time, the noise reduction groove 23 between the front guide surface 21 and the rear guide surface 22 can dissipate the vortex generated by the flue gas 50 passing through the front guide surface 21, reducing the vortex intensity, thereby reducing the aerodynamic noise of the flue gas 50 and improving the noise problem of the fan using the volute tongue assembly.

[0092] To achieve a better noise reduction effect for the fan, the front guide surface 21 and rear guide surface 22 of the volute tongue assembly 20 of this embodiment are curved. Specifically, along the flow direction of the flue gas 50, the rear guide surface 22 is arranged in a concave arc facing away from the flue gas flow path, while the front guide surface 21 is arranged in a convex arc facing the flue gas flow path; and / or, along the width direction of the enclosure 12, the rear guide surface 22 is arranged in a concave arc facing away from the flue gas flow path, while the front guide surface 21 is arranged in a concave arc facing away from the flue gas flow path.

[0093] In one implementation, referring to Figure 1 、 Figures 4 to 6 As shown, the front guide surface 21 and the rear guide surface 22 are both bidirectional arc structures. The rear guide surface 22 is arranged in an arc shape with the middle part concave outward along the width direction of the enclosure 12 (the direction indicated by the arrow C), which can be specifically an arc shape; the rear guide surface 22 is arranged in an arc shape with the middle part concave outward along the flow direction of the flue gas 50 (the direction indicated by the arrow B), which can be specifically an arc shape. The front guide surface 21 is arranged in an arc shape with the middle part concave outward along the width direction of the enclosure 12 (the direction indicated by the arrow C), which can be specifically an arc shape; the front guide surface 21 is arranged in an arc shape with the middle part convex inward along the flow direction of the flue gas 50 (the direction indicated by the arrow B), which can be specifically an arc shape. Among them, inward refers to the direction close to the center of the flue gas flow passage of the volute 10, and outward refers to the direction of the flue gas flow passage away from the volute 10, with Figure 5 For example, the left side of the volute tongue assembly 20 is generally the inner side, and the right side of the volute tongue assembly 20 is generally the outer side.

[0094] The front guide surface 21 and rear guide surface 22 of the volute tongue assembly 20 of this embodiment may also be unidirectional curved structures. For example, both the front guide surface 21 and the rear guide surface 22 may be arranged in an outwardly concave arc shape only along the width direction of the enclosure 12, while extending in a straight line in the flow direction of the flue gas 50. For another example, the front guide surface 21 may be arranged in an inwardly convex arc shape only along the flow direction of the flue gas 50, while extending generally in a straight line along the width direction of the enclosure 12. For another example, the rear guide surface 22 may be arranged in an outwardly concave arc shape only along the flow direction of the flue gas 50, while extending generally in a straight line along the width direction of the enclosure 12.

[0095] It should be noted that both the front guide surface 21 and the rear guide surface 22 are bidirectionally curved structures. The curved arrangement along the circumference of the enclosure 12 facilitates diverting the smoke 50 from the square exhaust port 11 of the volute 10 into the circular smoke flow path, i.e., the circular channel of the exhaust pipe, thereby reducing the impact of the smoke 50 on the volute tongue or the exhaust seat 30. Simultaneously, the curved shape along the direction of smoke flow facilitates guiding and smoothing the flow of the smoke 50. Therefore, this method can be regarded as the optimal implementation method. This embodiment is also primarily described in this manner.

[0096] In this embodiment, the leading guide surface 21 of the volute tongue assembly 20 is a first concave curved surface, its shape matching the volute tongue position of the shroud 12 of the volute 10, namely, the arc surface 121 of the shroud 12. The trailing guide surface 22 is a second concave surface. Because the impeller 40 has a high center speed and low speeds on both sides, the leading guide surface 21 is shaped like a saddle surface (also called a hyperbolic paraboloid). This places the upper and lower portions of the volute tongue closer to the low-speed flue gas zone of the impeller 40, while the concave surface in the middle of the volute tongue avoids the high-speed flue gas zone formed by the impeller 40, helping to improve fan efficiency. Since vortex is easily formed at the outlet of the front guide surface 21 of the volute tongue, a noise reduction groove 23 is provided between the front guide surface 21 and the rear guide surface 22. The noise reduction groove 23 can dissipate the vortex energy at the volute tongue and play a certain role in noise reduction. In addition, the rear guide surface 22 is provided to guide the flue gas 50, and can smoothly guide the flue gas 50 to the check valve seat (that is, the outlet seat 30), and finally flow out from the circular exhaust port 32 (such as Figure 17 As shown), the vortex at the smoke outlet 11 of the volute 10 can be eliminated, further improving the fan efficiency.

[0097] Furthermore, the arc of the rear guide surface 22 along the width direction of the enclosure 12 is slightly eccentrically arranged, that is, along the width direction of the enclosure 12, the midpoint of the arc of the rear guide surface 22 deviates from the center of the enclosure 12 in the width direction.

[0098] like Figure 4 and 7 As shown, the rear guide surface 22 is eccentrically arranged in the width direction of the panel 12 (the direction indicated by the arrow C), and the midpoint of the arc of the rear guide surface 22 deviates to one end (refer to Figure 4 In terms of upward displacement), the rear guide surface 22 is Figure 4 The arc length at the upper end is longer, corresponding to Figure 7 That is, the distance between the upper end of the rear guide surface 22 and the shroud 12 on which it is mounted is greater than the distance between the lower end of the rear guide surface 22 and the shroud 12 on which it is mounted. Since the middle and lower middle portions of the impeller 40 are high-speed airflow areas, this arrangement allows the middle portion of the inner concave surface of the rear guide surface 22 to be slightly offset, further avoiding the high-speed airflow area of the impeller 40, thereby further helping to improve fan efficiency, reduce aerodynamic noise, and better guide the airflow.

[0099] In this embodiment, the noise reduction groove 23 of the volute tongue assembly 20 can be directly connected to the front guide surface 21 and the rear guide surface 22. Figure 4 and Figure 6 As shown, the edge of the front guide surface 21 close to the rear guide surface 22 is the first edge 211, and the edge of the rear guide surface 22 close to the front guide surface 21 is the second edge 221; the opposite side walls of the noise reduction groove 23 are respectively connected to the first edge 211 and the second edge 221, and the noise reduction groove 23 is recessed outward relative to the first edge 211 and the second edge 221 away from the flue gas flow channel.

[0100] It is understood that the smoke 50 passing through the front guide surface 21 directly impacts the noise reduction groove 23, which can directly buffer and dissipate the vortex formed by the smoke 50. The smoke 50 flowing out of the noise reduction groove 23 can directly flow out through the rear guide surface 22, improving the smoothness of the flow of the smoke 50.

[0101] Among them, reference Figure 7 As shown, the first edge 211 is located on the side of the second edge 221 close to the center of the flue gas flow channel. The resistance of the flue gas 50 flowing from the second noise reduction groove 23 to the second edge 221 is reduced, which can further improve the smoothness of the flue gas 50 flowing from the front guide surface 21 to the rear guide surface 22.

[0102] Along the extension direction of the first edge 211 (or the second edge 221), that is, roughly the width direction of the enclosure 12, the noise reduction groove 23 is set through. Figure 4 and Figure 6 As shown, the two ends of the noise reduction groove 23 are connected. When the smoke 50 enters the noise reduction groove 23, the smoke 50 will not be restricted by the ends of the noise reduction groove 23, so the vortex is easier to dissipate.

[0103] In this embodiment, the cross section of the noise reduction groove 23 can be roughly V-shaped. It is understood that when the smoke 50 enters the V-shaped space from the curved surface of the front guide surface 21, the smoke 50 does not continue to flow along the curved surface, which can reduce the formation of vortices and facilitate the dissipation of the formed vortices.

[0104] It should be noted that the cross-section of the noise reduction groove 23 may also be U-shaped or other shapes that can play a noise reduction role.

[0105] In one specific implementation, the volute tongue assembly 20 of this embodiment can be a separate structure from the volute 10, and can be fixedly mounted separately from the shroud 12 of the volute 10. The separate structure makes it easier to replace and maintain the volute tongue assembly 20, as well as to independently and uniformly produce and purchase it. The separate volute tongue assembly 20 can be fixedly mounted to the volute tongue of the shroud 12 of the volute 10 by screws, rivets, or clamping.

[0106] Specifically, the volute tongue assembly includes a main body shell, which is arranged in an open groove shape, and the bottom wall 26 of the main body shell is arranged on the side facing away from the interior of the main body shell facing the flue gas flow channel, and a front guide surface 21, a noise reduction groove 23 and a rear guide surface 22 are formed on the bottom wall 26 of the main body shell; the opening of the main body shell faces the enclosure 12, and the main body shell side wall 27 of the main body shell is used to fit with the enclosure 12.

[0107] like Figure 1As shown, the main body shell includes a bottom wall 26 and a main body shell side wall 27 connected to the bottom wall 26. The bottom wall 26 and the main body shell side wall 27 form a hollow groove. The lower ends of the front guide surface 21 of the main body shell side wall 27 and the bottom wall 26 are used to fit with the enclosure 12. The opening of the groove is adapted to the arc surface 121 of the enclosure 12 and the enclosure plane 122 located at the smoke outlet 11 of the volute 10.

[0108] A connecting post 24 is provided on the side of the bottom wall 26 of the main body shell facing the interior of the main body shell. The connecting post 24 is used to be fixedly connected to the enclosure 12. In order to improve the installation stability of the volute tongue assembly 20, the number of connecting posts 24 is at least three. At least two connecting posts 24 correspond to the front guide surface 21 and are arranged in sequence along the width direction of the enclosure 12. They are used to cooperate with the arc surface 121 of the enclosure 12 for positioning and fixing. At least one connecting post 24 is provided at the end of the rear guide surface 22 away from the front guide surface 21. It is used to fix to the enclosure plane 122 of the enclosure 12 of the volute 10 located on the side of the smoke exhaust port 11.

[0109] like Figure 1 As shown, there are three connecting posts 24: a first connecting post 241 and a second connecting post 242, disposed on the front guide surface 21 and facing the enclosure 12; and a third connecting post 243, disposed on the rear guide surface 22 and extending toward the enclosure 12. The first connecting post 241 corresponds to a first hole 251 on the enclosure 12, the second connecting post 242 corresponds to a second hole 252 on the enclosure 12, and the third connecting post 243 corresponds to a third hole 253 on the enclosure 12. Each connecting post 24 is installed with screws. This connection arrangement is simple in structure, easy to implement, and provides a direct and reliable connection effect.

[0110] In summary, the volute tongue assembly 20 of this embodiment can be separated and configured to solve the problem of uneven airflow at the duct outlet, where the velocity is high in the middle and low on both sides, and eliminate outlet vortices. The saddle-shaped front guide surface 21 enhances the pressure and efficiency brought about by the deep / short volute tongue, and the V-shaped noise-reducing groove 23 dissipates the vortex energy at the volute tongue, thus achieving a certain noise reduction effect. The rear guide surface 22 guides the airflow, smoothly guiding the smoke 50 to the circular exhaust port 32 of the outlet seat 30 (check valve seat) for outflow, thereby eliminating outlet vortices.

[0111] In summary, the fan assembly of this embodiment has a split volute tongue assembly 20 installed on the arc surface 121 of the volute 10, and has an outlet seat 30 that smoothly extends along the contour of the smoke exhaust port 11 of the volute 10 and guides the smoke 50 in its inner cavity, with high efficiency and low noise.

[0112] This embodiment also provides a range hood, including the fan assembly provided in this embodiment.

[0113] like Figure 17 As shown, the specific range hood can be a side suction range hood, wherein the fan is tilted and arranged in the range hood housing, the smoke outlet 11 of the volute 10 of the fan assembly is arranged approximately horizontally, and the air outlet seat 30 is approximately vertically installed on the smoke outlet 11 of the volute 10. Figure 17 The arrow A indicates the flow direction of the flue gas 50 .

[0114] The range hood of this embodiment has the same beneficial effects as the air outlet seat 30 and the fan assembly provided in this embodiment.

[0115] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An air outlet seat, used for connecting between the smoke outlet (11) of the volute (10) and the smoke exhaust pipe, characterized in that: It comprises a seat body, wherein a first fluid channel (33) and a second fluid channel (35) are sequentially arranged in the seat body along the flow direction of the smoke (50); The air inlet (31) of the first fluid channel (33) is suitable for matching the square smoke exhaust port (11) of the volute (10); the cross section of the first fluid channel (33) gradually changes from the cross section corresponding to the air inlet (31) of the first fluid channel (33) to the cross section corresponding to the exhaust port of the first fluid channel (33) at a first variation amplitude along the flow direction of the smoke (50); the exhaust port of the first fluid channel (33) is aligned, connected and connected with the air inlet of the second fluid channel (35); the cross section of the second fluid channel (35) gradually changes from the cross section corresponding to the air inlet of the second fluid channel (35) to the cross section corresponding to the exhaust port (32) of the second fluid channel (35) at a second variation amplitude along the flow direction of the smoke (50); the exhaust port (32) of the second fluid channel (35) is suitable for matching the smoke inlet of the circular smoke exhaust pipe; A transition line is formed in the circumferential direction of the second fluid channel (35) at a position where the air outlet of the first fluid channel (33) is connected to the air inlet of the second fluid channel (35); The side wall of the first fluid channel (33) includes a first side a (331), a first side b (332), a first side c (333), and a first side d (334) connected in sequence, and the side wall of the second fluid channel (35) includes a second side a (351), a second side b (352), a second side c (353), and a second side d (354) connected in sequence; The first a-side surface (331) is correspondingly arranged above the enclosure (12) of the volute (10) opposite to the volute tongue, and the lower edge of the second a-side surface (351) is aligned and connected with the upper edge of the first a-side surface (331), forming a first transition mark (371); The first C side surface (333) is correspondingly arranged above the circumference (12) of the volute (10) provided with the volute tongue, and the lower edge of the second C side surface (353) is aligned and connected with the upper edge of the first C side surface (333), thereby forming a third transition mark (373); The first b side (332) and the first d side (334) are respectively arranged above the two side plates (13) of the volute (10); the lower edge of the second b side (352) is aligned and connected with the upper edge of the first b side (332), and a second transition mark (372) is formed; the lower edge of the second d side (354) is aligned and connected with the upper edge of the first d side (334), and a fourth transition mark (374) is formed; The lower end of the first side surface (331) is tangentially transitionally connected to the upper portion of the enclosure (12) opposite to the volute tongue of the volute (10); The lower ends of the first side a (331), the first side b (332), the first side c (333) and the first side d (334) are sequentially arranged to form a square, so that the air inlet (31) of the first fluid channel (33) matches the smoke exhaust port (11) of the volute (10).

2. The gas outlet seat according to claim 1, characterized in that: The first side a (331) is concave inwardly in an arc shape from bottom to top, and the second side a (351) is arranged perpendicular to the plane where the smoke exhaust port (11) of the volute (10) is located in the up-down direction; The first c-side surface (333) is arranged to protrude outwards in a direction from bottom to top, and the second c-side surface (353) is arranged to be inclined outwards gradually away from the center of the second fluid channel (35) in a direction from bottom to top.

3. The gas outlet seat according to claim 2, characterized in that: In the direction from bottom to top: the first a-side surface (331), the second a-side surface (351), the first c-side surface (333) and the second c-side surface (353) all extend smoothly, and the variation amplitude of the first a-side surface (331) in the radial direction of the first fluid channel (33) is greater than the variation amplitude of the second a-side surface (351) in the radial direction of the second fluid channel (35), and the variation amplitude of the first c-side surface (333) in the radial direction of the first fluid channel (33) is greater than the variation amplitude of the second c-side surface (353) in the radial direction of the second fluid channel (35).

4. The gas outlet seat according to claim 3, characterized in that: The first side a (331) and the first side c (333) are arcuate surfaces that protrude outward along the circumference of the first fluid channel (33), and the second side a (351) and the second side c (353) are arcuate surfaces that protrude outward along the circumference of the second fluid channel (35).

5. The gas outlet seat according to any one of claims 1 to 4, characterized in that: The first b side (332), the second b side (352), the first d side (334) and the second d side (354) are all flat plates; the first b side (332) and the first d side (334) are both arranged perpendicular to the plane where the smoke exhaust port (11) of the volute (10) is located; the second b side (352) and the second d side (354) are arranged close to each other and are inwardly inclined.

6. The gas outlet seat according to claim 5, characterized in that: The inclination angle of the second b side surface (352) and / or the second d side surface (354) is no greater than 5 degrees.

7. The gas outlet seat according to claim 5, characterized in that: The height from the upper end to the lower end of the air outlet seat is greater than the distance between the first b side (332) and the first d side (334), and the distance between the first b side (332) and the first d side (334) is greater than the maximum width of the smoke exhaust port (11) of the volute (10).

8. The gas outlet seat according to claim 5, characterized in that: In the direction from bottom to top: the lengths of the second side a (351) and the second side c (353) along the circumference of the second fluid channel (35) are gradually extended, and the lengths of the second side b (352) and the second side d (354) along the circumference of the second fluid channel (35) are gradually shortened.

9. The gas outlet seat according to claim 1, characterized in that: The outer peripheral surface of the lower end of the seat body is connected to a connecting portion (71) for connecting to the top plate of the volute (10), and the upper end of the seat body is connected to a circular outlet joint (72).

10. A fan assembly, characterized in that: It comprises a volute (10) and an air outlet seat (30) according to any one of claims 1 to 9 connected to a smoke exhaust port (11) of the volute (10).

11. The fan assembly according to claim 10, characterized in that: A volute tongue assembly (20) is installed at the volute tongue position of the enclosure (12) of the volute (10); The volute tongue assembly (20) comprises a front guide surface (21), a noise reduction groove (23), and a rear guide surface (22) arranged in sequence along the up-down direction, wherein the front guide surface (21) and the rear guide surface (22) are arranged facing the flue gas flow passage of the volute (10).

12. The fan assembly according to claim 11, characterized in that The rear guide surface (22) is arranged in an arc shape along the width direction of the enclosure (12) and away from the flue gas flow channel, and the front guide surface (21) is arranged in an arc shape along the width direction of the enclosure (12) and away from the flue gas flow channel.

13. The fan assembly according to claim 12, characterized in that: The front guide surface (21) is arranged in an arc shape convex toward the flue gas flow passage in the up-down direction, and the rear guide surface (22) is arranged in an arc shape concave away from the flue gas flow passage in the up-down direction.

14. The fan assembly according to claim 12, characterized in that The rear guide surface (22) is arranged in an arc shape along the width direction of the enclosure (12), and the midpoint of the arc shape of the rear guide surface (22) deviates from the center of the width direction of the enclosure (12); and / or; The front guide surface (21) is arranged in the form of a saddle surface.

15. The fan assembly according to claim 11, characterized in that The edge of the front guide surface (21) close to the rear guide surface (22) is a first edge (211), and the edge of the rear guide surface (22) close to the front guide surface (21) is a second edge (221); The opposite side walls of the noise reduction groove (23) are respectively connected to the first edge (211) and the second edge (221), and the noise reduction groove (23) is recessed outwardly away from the flue gas flow channel relative to the first edge (211) and the second edge (221).

16. The fan assembly according to claim 15, characterized in that Along the extension direction of the first edge (211), the noise reduction groove (23) is provided through-through; and / or; The cross section of the noise reduction groove (23) is V-shaped.

17. The fan assembly according to claim 11, characterized in that The volute tongue assembly (20) is detachably connected to the enclosure plate (12).

18. The fan assembly according to claim 17, characterized in that The volute tongue assembly (20) includes a main body shell, the main body shell is arranged in an open groove shape, the bottom wall (26) of the main body shell is arranged on a side facing away from the interior of the main body shell and facing the flue gas flow channel, and the bottom wall (26) of the main body shell is formed with the front guide surface (21), the noise reduction groove (23) and the rear guide surface (22); The opening of the main body shell faces the enclosure (12), and the main body shell side wall (27) of the main body shell is used to fit with the enclosure (12).

19. The fan assembly according to claim 18, characterized in that A connecting column (24) is provided on a side of the bottom wall (26) of the main body shell facing the interior of the main body shell, and the connecting column (24) is used to connect to the enclosure (12).

20. A range hood, characterized in that: The fan assembly comprises the fan assembly according to any one of claims 10 to 19.

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