CN215860987U - Volute tongue structure, fan, air duct device and range hood - Google Patents

Abstract

The utility model provides a volute tongue structure, a fan, an air duct device and a range hood, and relates to the technical field of kitchen appliances, wherein the volute tongue structure comprises a volute tongue body, the volute tongue body is sequentially provided with a first guide surface and a second guide surface along the flowing direction of air flow, the first guide surface and the second guide surface are both used for being arranged towards an air flow channel of a volute, and a noise reduction groove is arranged between the first guide surface and the second guide surface; when passing through the volute tongue body, airflow formed by smoke flows out after being guided by the first guide surface and the second guide surface in sequence, and the flowing direction of the airflow can be combed under the guiding action of the first guide surface and the second guide surface, so that the purpose of reducing noise is achieved; and the noise reduction groove between the first guide surface and the second guide surface can dissipate the vortex generated by the airflow, so that the strength of the vortex is reduced, the pneumatic noise of the airflow is reduced, and the noise problem of a fan applying the volute tongue body is improved.

Description

Volute tongue structure, fan, air duct device and range hood

Technical Field

The utility model relates to the technical field of kitchen appliances, in particular to a volute tongue structure, a fan, an air duct device and a range hood.

Background

The range hood is an electrical appliance for improving the cooking environment of a kitchen, and the range hood is various, wherein the side-draft range hood is a common one. The volute of the existing side-draft range hood is obliquely arranged, the air outlet seat is vertically arranged, airflow is forced to flow vertically after obliquely flowing out of the volute, and the unsmooth transition causes the increase of exhaust air resistance and the rise of noise. The volute tongue area is continuously strongly impacted by airflow at the outlet of the fan, so that the volute tongue area is easy to generate vortex and becomes one of main pneumatic noise sources of the fan.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a volute tongue structure, a fan, an air duct device and a range hood, and aims to solve the technical problem that the fan of the range hood in the prior art has high noise.

The volute tongue structure provided by the utility model is used for being installed on a surrounding plate of a volute and provided with a volute tongue, and is arranged corresponding to the volute tongue, the volute tongue structure comprises a volute tongue body, a first guide surface and a second guide surface are sequentially arranged on the volute tongue body along the flowing direction of airflow, the first guide surface and the second guide surface are both used for being arranged facing an airflow channel of the volute, and a noise reduction groove is arranged between the first guide surface and the second guide surface.

Further, the first guide surface is a curved surface, and/or the second guide surface is a curved surface.

Further, in the flow direction of the air flow: the second guide surface is in arc arrangement which is recessed away from the airflow channel;

and/or;

along the width direction of the coaming: the second guide surface is in an arc shape which deviates from the air flow channel and is sunken.

Further, in the width direction of the coaming: the second guide surface is arranged in a circular arc shape, and the middle point of the circular arc shape of the second guide surface deviates from the center of the enclosing plate in the width direction.

Further, in the flow direction of the air flow: the first guide surface is arranged in an arc shape protruding towards the airflow channel;

and/or;

along the width direction of the coaming: the first guide surface is in an arc shape which is recessed away from the airflow channel.

Furthermore, the first guide surface is arranged on a saddle surface.

Furthermore, the edge of the first guide surface close to the second guide surface is a first edge, and the edge of the second guide surface close to the first guide surface is a second edge;

the two opposite side walls of the noise reduction groove are respectively connected with the first edge and the second edge, and the noise reduction groove is opposite to the first edge and the second edge and deviates from the airflow channel to be recessed outwards.

Further, along the extending direction of the first edge, the noise reduction groove is arranged in a penetrating mode.

Further, the cross section of the noise reduction groove is arranged in a V shape.

Further, the first edge is located on one side of the second edge close to the center of the airflow channel.

Further, the volute tongue body comprises a shell, the shell is in an open groove-shaped arrangement, one side, away from the interior of the shell, of the bottom wall of the shell is arranged facing the airflow channel, and the first guide surface, the noise reduction groove and the second guide surface are formed on the bottom wall of the shell;

the opening of the shell faces the coaming, and the shell side wall of the shell is used for being attached to the coaming.

Further, one side of the bottom wall of the shell, which faces the inside of the shell, is provided with a mounting column, and the mounting column is used for being fixedly connected with the enclosing plate.

Furthermore, the number of the mounting columns is at least three, at least two mounting columns are arranged at intervals in sequence along the width direction of the enclosing plate corresponding to the first guide surface, and at least one mounting column is arranged at one end, far away from the first guide surface, corresponding to the second guide surface.

The fan comprises a volute and the volute tongue structure arranged on the volute.

Optionally, the volute tongue structure is detachably mounted on the coaming.

The air duct device provided by the utility model comprises the fan provided by the utility model.

Furthermore, the air duct device further comprises an air outlet seat arranged at the air outlet of the volute, a flow channel is arranged in the air outlet seat, an air inlet of the flow channel is correspondingly connected with the air outlet of the volute, and the air outlet of the flow channel is used for being connected with a smoke exhaust pipe.

Furthermore, the flow channel comprises a first flow channel and a second flow channel which are sequentially connected along the flowing direction of the airflow, the lower end of the first flow channel is suitable for being matched with the square air outlet of the volute, and the upper end of the second flow channel is suitable for being matched with the circular air inlet of the smoke exhaust pipe;

in the flow direction of the gas stream: the first flow channel and the second flow channel both gradually shrink inwards, the section of the first flow channel gradually smoothly transits to the section corresponding to the air inlet of the second flow channel, the section of the second flow channel gradually smoothly transits to the section corresponding to the air outlet of the second flow channel, and a transition crease line is formed in the circumferential direction of the flow channel at the position where the air outlet of the second flow channel is connected with the air inlet of the first flow channel.

Furthermore, the inner wall of the flow channel corresponding to the position of at least one of the two surrounding plates of the volute is arranged in an arc-shaped surface, the arc-shaped surface is arranged in an arc shape protruding outwards along the circumferential direction of the flow channel, and the inner wall of the flow channel corresponding to the position of at least one of the two side plates of the volute is arranged in a plane.

Further, the air outlet seat comprises a main body part, the main body part comprises a first side wall, a second side wall, a third side wall and a fourth side wall which are sequentially connected into a ring shape, and the first side wall, the second side wall, the third side wall and the fourth side wall form the flow channel;

the first side wall is correspondingly arranged above the enclosing plate opposite to the volute tongue of the volute, the third side wall is correspondingly arranged above the enclosing plate where the volute tongue of the volute is located, the second side wall and the fourth side wall are respectively arranged corresponding to the positions where the two side plates of the volute are located, the first side wall and the third side wall are both arc-shaped plates protruding outwards along the circumferential direction of the flow channel, and the second side wall and/or the fourth side wall are both flat plates.

Further, the first side wall comprises a first sub-wall and a second sub-wall which are sequentially arranged along the flowing direction of the airflow, the second side wall comprises a third sub-wall and a fourth sub-wall which are sequentially arranged along the flowing direction of the airflow, the third side wall comprises a fifth sub-wall and a sixth sub-wall which are sequentially arranged along the flowing direction of the airflow, the fourth side wall comprises a seventh sub-wall and an eighth sub-wall which are sequentially arranged along the flowing direction of the airflow, the first sub-wall, the third sub-wall, the fifth sub-wall and the seventh sub-wall are sequentially connected to form the first flow channel, and the second sub-wall, the fourth sub-wall, the sixth sub-wall and the eighth sub-wall are sequentially connected to form the second flow channel;

the first sub-wall, the second sub-wall, the fifth sub-wall and the sixth sub-wall are all arranged in an outward-protruding arc shape along the circumferential direction of the flow channel;

the third sub-wall, the fourth sub-wall, the seventh sub-wall and the eighth sub-wall are all plane plates, the third sub-wall and the seventh sub-wall are all perpendicular to a plane where an air outlet of the volute is located, and the fourth sub-wall and the eighth sub-wall are close to each other and are arranged in a retracted inclined manner.

Further, in the flow direction of the gas flow: the first sub-wall is inwards recessed to form an arc, the fifth sub-wall gradually protrudes outwards, the second sub-wall is perpendicular to the plane where the air outlet of the volute is located, and the sixth sub-wall gradually inclines outwards away from the center of the flow channel along the flowing direction of the airflow;

and/or;

in the direction of flow of the gas stream: the first sub-wall, the second sub-wall, the fifth sub-wall and the sixth sub-wall extend smoothly, and the variation amplitude of the first sub-wall in the radial direction of the flow passage is larger than that of the second sub-wall in the radial direction of the flow passage, and the variation amplitude of the fifth sub-wall in the radial direction of the flow passage is larger than that of the sixth sub-wall in the radial direction of the flow passage;

and/or;

in the flow direction of the gas stream: the lengths of the second sub-wall and the sixth sub-wall along the circumferential direction of the flow channel are gradually prolonged, the lengths of the fourth sub-wall and the eighth sub-wall along the circumferential direction of the flow channel are gradually shortened, the upper end of the first sub-wall is aligned with the lower end of the second sub-wall, the upper end of the third sub-wall is aligned with the lower end of the fourth sub-wall, the upper end of the fifth sub-wall is aligned with the lower end of the sixth sub-wall, and the upper end of the seventh sub-wall is aligned with the lower end of the eighth sub-wall;

and/or;

the upper ends of the first sub-wall, the third sub-wall, the fifth sub-wall and the seventh sub-wall are arranged in a flush manner.

Further, the inclination angles of the fourth sub-wall and the eighth sub-wall are not more than 5 degrees;

and/or;

the height from the upper end to the lower end of the air outlet seat is greater than the distance between the third sub-wall and the seventh sub-wall, and the distance between the third sub-wall and the seventh sub-wall is greater than the maximum width of an air outlet of the volute;

the lower end of the first sub-wall is in tangential transition connection with the upper part of the enclosing plate opposite to the volute tongue of the volute.

Further, the air outlet seat further comprises a first connecting seat and a second connecting seat, the first connecting seat is provided with an inlet, the second connecting seat is provided with an outlet, the inlet, the runner and the outlet are sequentially communicated, the first connecting seat is connected to one end, located at the air inlet of the runner, of the main body, the second connecting seat is connected to one end, located at the air outlet of the runner, of the main body, the first connecting seat is suitable for being connected with a connecting portion of the air outlet of the volute, and the second connecting seat is suitable for being connected with the smoke exhaust pipe.

Furthermore, four inner walls of the inlet are respectively correspondingly and gently connected between the four side walls of the air outlet of the volute and the lower ends of the first side wall, the second side wall, the third side wall and the fourth side wall;

and/or;

the export is circular setting, the inside wall of export with the upper end of first lateral wall, the upper end of second lateral wall, the upper end of third lateral wall with the equal smooth transition in upper end of fourth lateral wall is connected.

The range hood provided by the utility model comprises the fan provided by the utility model or the air duct device provided by the utility model.

The volute tongue structure provided by the utility model is used for being installed on a surrounding plate of a volute and provided with a volute tongue, and is arranged corresponding to the volute tongue of the volute. When passing through the volute tongue body, airflow formed by smoke flows out after being guided by the first guide surface and the second guide surface in sequence, and the flowing direction of the airflow can be combed under the guiding action of the first guide surface and the second guide surface, so that the purpose of reducing noise is achieved; and the noise reduction groove between the first guide surface and the second guide surface can dissipate the vortex generated by the airflow passing through the first guide surface, so that the strength of the vortex is reduced, the pneumatic noise of the airflow is reduced, and the noise problem of a fan applying the volute tongue body is improved.

The fan provided by the utility model comprises the volute and the volute tongue structure arranged on the volute, and has the same beneficial effects as the volute tongue structure provided by the utility model.

The air duct device provided by the utility model comprises the fan provided by the utility model, and has the same beneficial effects as the volute tongue structure and the fan provided by the utility model.

The range hood provided by the utility model comprises the fan provided by the utility model or the air duct device provided by the utility model, and has the same beneficial effect as the volute tongue structure provided by the utility model.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.

FIG. 1 is a schematic view of a volute tongue structure provided in an embodiment of the present invention;

FIG. 2 is a schematic view of a volute of the volute assembly provided by an embodiment of the present invention;

FIG. 3 is a schematic view of an assembly process of the volute tongue structure and the shroud according to the embodiment of the present invention;

FIG. 4 is a schematic view of a volute tongue structure according to an embodiment of the present invention;

FIG. 5 is a schematic view of a view of the volute tongue structure mounted on the shroud according to an embodiment of the present invention;

FIG. 6 is a schematic view of FIG. 5 after the view angle is switched;

FIG. 7 is a partial schematic view of a volute assembly provided by an embodiment of the present invention;

FIG. 8 is a schematic view of a volute assembly provided by an embodiment of the present invention;

FIG. 9 is a schematic view of an outlet seat provided in accordance with an embodiment of the present invention;

FIG. 10 is a schematic view of FIG. 9 after the angle of view has been switched;

FIG. 11 is a side view of FIG. 10;

FIG. 12 is a schematic front view of FIG. 10;

FIG. 13 is a schematic view of an air duct apparatus according to an embodiment of the present invention;

FIG. 14 is a schematic view of FIG. 13 after changing the viewing angle;

FIG. 15 is an internal schematic view of the air duct assembly shown in FIG. 14;

FIG. 16 is a schematic view of an actual installation of an air duct device according to an embodiment of the present invention;

fig. 17 is an internal schematic view of a range hood provided in the embodiment of the present invention.

Icon: 10-a volute; 11-an air outlet; 12-enclosing plates; 121-arc surface; 122-plane of coaming; 13-side plate; 20-volute tongue structure; 21-a first guide surface; 211 — a first edge; 22-a second guide surface; 221-a second edge; 23-noise reduction grooves; 24-mounting posts; 241-a first mounting post; 242-a second mounting post; 243-third mounting post; 251-a first hole site; 252-second hole site; 253-third hole site; 26-a bottom wall; 27-housing side walls; 30-an air outlet seat; 31-an inlet; 32-an outlet; 33-a first flow channel; 331-a first sub-wall; 332-a third sub-wall; 333-a fifth sub-wall; 334-a seventh sub-wall; 341-first ridge line; 342-a second ridge line; 343-third ridge line; 344-fourth ridge line; 35-a second flow channel; 351-a second sub-wall; 352-fourth sub-wall; 353-sixth sub-wall; 354-eighth sub-wall; 361-fifth ridge line; 362-sixth ridge line; 363-seventh ridge line; 364-eighth ridge line; 40-an impeller; 50-gas flow; 60-flow channel; 61-a first side wall; 62-a second sidewall; 63-a third side wall; 64-a fourth side wall; 71-a first connection mount; 72-second connecting seat.

Detailed Description

The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Examples

The volute of the existing side-draft range hood is obliquely arranged, the air outlet seat (or the check valve seat) is vertically arranged, airflow is forced to flow vertically after obliquely flowing out of the volute, and the unsmooth transition causes the increase of exhaust wind resistance and noise rise.

In order to solve the above problem, as shown in fig. 1 to 17, the present embodiment provides a volute tongue structure 20, which is used for being mounted on the shroud 12 of the volute 10, and is provided with a volute tongue, and is arranged corresponding to the volute tongue of the volute 10. The volute tongue structure 20 of the present embodiment includes a volute tongue body, the volute tongue body is sequentially provided with a first guide surface 21 and a second guide surface 22 along the flowing direction of the airflow 50, both the first guide surface 21 and the second guide surface 22 are used for facing the airflow channel of the volute casing 10, and a noise reduction groove 23 is provided between the first guide surface 21 and the second guide surface 22.

The first guide surface 21 and the second guide surface 22 are used for guiding the airflow 50 formed by the flue gas, so that the flue gas can smoothly flow from the volute 10 into the air outlet seat 30 and further into the smoke exhaust pipe. The first guide surface 21 and the second guide surface 22 may be inclined surfaces (generally, flat surfaces) for guiding, or may be curved surfaces, where the curved surfaces may be disposed in an arc shape along the width direction of the shroud 12 provided with the volute tongue, or disposed in an arc shape along the flowing direction of the airflow 50, or disposed in an arc shape along both directions. The shape of the first guide surface 21 and the shape of the second guide surface 22 can be selected according to requirements, and both can be inclined surfaces, curved surfaces, or one of the two can be a curved surface and the other can be an inclined surface.

In the volute tongue structure 20 of the present embodiment, the first guide surface 21 and the second guide surface 22 are both disposed facing the airflow channel of the volute casing 10 and sequentially disposed along the flowing direction of the airflow 50, so that the airflow 50 formed by the flue gas flows out after being sequentially guided by the first guide surface 21 and the second guide surface 22 when passing through the volute tongue body in the flowing process. The flow direction of the airflow 50 can be combed by the flow guiding effect of the first guide surface 21 and the second guide surface 22, and the purpose of reducing noise is achieved. Meanwhile, the noise reduction groove 23 between the first guide surface 21 and the second guide surface 22 can dissipate the vortex generated by the airflow 50 passing through the first guide surface 21, so that the strength of the vortex is reduced, the pneumatic noise of the airflow 50 is reduced, and the noise problem of a fan applying the volute tongue body is improved.

In order to make the fan have a better noise reduction effect, the first guide surface 21 of the volute tongue structure 20 of the present embodiment is a curved surface, and the second guide surface 22 is a curved surface. Specifically, in the flow direction of the airflow 50: the second guide surface 22 is arranged in an arc shape which is concave away from the airflow channel, and the first guide surface 21 is arranged in an arc shape which is convex towards the airflow channel; and/or; along the width direction of the shroud 12: the second guide surface 22 is in an arc-shaped arrangement deviating from the recess of the air flow channel, and the first guide surface 21 is in an arc-shaped arrangement deviating from the recess of the air flow channel.

In one implementation, referring to fig. 1 and 4 to 6, the first guide surface 21 and the second guide surface 22 are both bidirectional arc structures, and the second guide surface 22 is arranged in an arc shape with a middle portion being recessed outwards along the width direction (the direction indicated by the arrow C) of the enclosure 12, and may be in an arc shape; the second guide surface 22 is provided in an arc shape with a middle portion depressed outward in the flow direction (the direction indicated by the arrow B) of the airflow 50, and may be in an arc shape. The first guide surface 21 is disposed in an arc shape with a concave portion at the middle portion outward in the width direction (the direction indicated by the arrow C) of the shroud 12, and specifically, may be in an arc shape with a convex portion at the middle portion inward in the flow direction (the direction indicated by the arrow B) of the airflow 50. Taking fig. 5 as an example, the left side of the volute tongue structure 20 is the inner side, and the right side of the volute tongue structure 20 is the outer side.

The first guide surface 21 and the second guide surface 22 of the volute tongue structure 20 of the present embodiment may also be a one-way curved surface structure, for example, the first guide surface 21 and the second guide surface 22 are both disposed in an outwardly concave arc shape only along the width direction of the shroud 12, and the first guide surface 21 and the second guide surface 22 extend in a straight line in the flowing direction of the airflow 50. For another example, the first guide surface 21 is provided only in an arc shape protruding inward in the flow direction of the airflow 50, and extends substantially linearly in the width direction of the shroud 12. For another example, the second guide surface 22 is only provided in an outwardly concave arc shape along the flow direction of the airflow 50, and extends substantially linearly along the width direction of the shroud 12.

It should be specially noted that the first guide surface 21 and the second guide surface 22 are both bidirectional arc structures, wherein the arc arrangement along the circumferential direction of the shroud plate 12 is beneficial to turning the airflow 50 from the square air outlet 11 of the volute 10 to a circular airflow channel, i.e. a circular channel of the smoke exhaust pipe, so as to reduce the impact of the airflow 50 on the volute tongue or the air outlet seat 30; at the same time, the arc shape along the flowing direction of the airflow 50 is beneficial to guiding the airflow 50 in the flowing direction and carding the flowing of the airflow 50. This approach can be considered the most preferred embodiment. The present embodiment is also explained mainly in this manner.

The first guiding surface 21 of the volute tongue structure 20 of this embodiment is a first concave curved surface, the shape of which matches with the volute tongue position of the shroud plate 12 of the volute casing 10, that is, the circular arc surface 121 of the shroud plate 12, and the second guiding surface 22 is a second concave surface. Because the impeller 40 has high middle speed and low speeds at two sides, the first guide surface 21 is in a saddle surface (also called as a hyperbolic paraboloid) shape, so that the upper part and the lower part of the volute tongue are closer to the low-speed airflow 50 area of the impeller 40, and the concave surface in the middle of the volute tongue can avoid the high-speed airflow 50 area formed by the impeller 40, thereby being beneficial to improving the efficiency of the fan. Because the vortex is easily formed at the outlet of the first guide surface 21 of the volute tongue, the noise reduction groove 23 is arranged between the first guide surface 21 and the second guide surface 22, and the noise reduction groove 23 can dissipate the energy of the vortex at the volute tongue to play a certain noise reduction role; in addition, the second guide surface 22 is arranged to guide the airflow 50, so that the airflow 50 can be smoothly guided to the check valve seat (i.e. the air outlet seat 30) and finally flows out from the circular air outlet (as shown in fig. 17), and the vortex at the air outlet 11 of the volute 10 can be eliminated, thereby further improving the fan efficiency.

Further, the second guide surface 22 is provided slightly off-center along the arc shape of the width direction of the apron 12, that is, along the width direction of the apron 12, the midpoint of the arc shape of the second guide surface 22 is offset from the center of the apron 12 in the width direction.

As shown in fig. 4 and 7, the second guide surface 22 is eccentrically disposed in the width direction (the direction indicated by the arrow C) of the shroud 12, the middle point of the arc of the second guide surface 22 is offset toward one end (upwardly offset with reference to fig. 4), and the arc length of the upper end of the second guide surface 22 in fig. 4 is longer, which corresponds to fig. 7, that is, the distance from the upper end of the second guide surface 22 to the shroud 12 to which it is mounted is greater than the distance from the lower end of the second guide surface 22 to the shroud 12 to which it is mounted. Because the middle part and the middle lower part of the impeller 40 are high-speed airflow regions, the middle part of the concave surface of the second guide surface 22 can deviate a little, so that the high-speed airflow region of the impeller 40 can be further avoided, the fan efficiency is improved, the aerodynamic noise is reduced, and meanwhile, the airflow guide effect is better played.

The noise reduction groove 23 of the volute tongue structure 20 of the present embodiment may be directly connected to the first guide surface 21 and the second guide surface 22. Specifically, as shown in fig. 4 and 6, an edge of the first guide surface 21 close to the second guide surface 22 is a first edge 211, and an edge of the second guide surface 22 close to the first guide surface 21 is a second edge 221; opposite side walls of the noise reduction groove 23 are connected to the first edge 211 and the second edge 221, respectively, and the noise reduction groove 23 is recessed outwardly away from the airflow path with respect to the first edge 211 and the second edge 221.

It will be appreciated that the air flow 50 passing through the first guide surface 21 directly impinges on the noise reduction grooves 23, and the noise reduction grooves 23 can directly damp and dissipate the vortex formed by the air flow 50. The air flow 50 flowing out through the noise reduction groove 23 can directly flow out through the second guide surface 22, and the smoothness of the air flow 50 is improved.

Referring to fig. 7, the first edge 211 is located on a side of the second edge 221 near the center of the airflow channel. The resistance of the air flow 50 from the second noise reduction groove 23 to the second edge 221 is reduced, and the smoothness of the air flow 50 from the first guide surface 21 to the second guide surface 22 can be further improved.

The noise reduction groove 23 is provided to penetrate in the extending direction of the first edge 211 (or the second edge 221), that is, substantially in the width direction of the shroud 12. As shown in fig. 4 and 6, since both ends of the noise reduction groove 23 are communicated with each other, when the air flow 50 enters the noise reduction groove 23, the air flow 50 is not restricted by the end of the noise reduction groove 23, and thus the vortex is more easily dissipated.

The noise reduction groove 23 of the present embodiment may be provided in a substantially V-shape in cross section. It will be appreciated that the air flow 50 enters the V-shaped space from the curved surface of the first guide surface 21, and the air flow 50 does not follow the curved surface, which reduces the formation of the vortex and facilitates the dissipation of the formed vortex.

It should be noted that the cross section of the noise reduction groove 23 may also be U-shaped or other shapes that can perform a noise reduction function.

In a specific implementation manner, the volute tongue structure 20 of the present embodiment may be a structure that is separate from the volute casing 10, and the structure may be separately and fixedly mounted with the shroud plate 12 of the volute casing 10, and the separate structure facilitates replacement, maintenance, and independent unified production and purchase of the volute tongue structure 20. The separate volute tongue structure 20 can be fixedly mounted with the volute tongue of the shroud plate 12 of the volute 10 through mounting manners such as screws, riveting or clamping.

Specifically, the volute tongue body comprises a shell, the shell is in an open groove shape, one side of the bottom wall 26 of the shell, which is deviated from the interior of the shell, is arranged towards an air flow channel, and a first guide surface 21, a noise reduction groove 23 and a second guide surface 22 are formed on the bottom wall 26 of the shell; the opening of the housing faces the shroud 12 and the housing side wall 27 of the housing is adapted to engage the shroud 12.

As shown in fig. 1, the housing includes a bottom wall 26 and housing side walls 27 connected to the bottom wall 26, and the bottom wall 26 and the housing side walls 27 form a hollow groove shape. The lower ends of the first guide surfaces 21 of the casing side wall 27 and the bottom wall 26 are adapted to be attached to the shroud 12, and the opening of the groove is adapted to the arc surface 121 of the shroud 12 and the shroud plane 122 located at the air outlet 11 of the scroll casing 10.

Wherein, the side of the bottom wall 26 of the housing facing the inside of the housing is provided with a mounting post 24, and the mounting post 24 is used for being fixedly connected with the enclosing plate 12. In order to improve the installation stability of the volute tongue structure 20, the number of the installation columns 24 is at least three, at least two installation columns 24 are arranged at intervals in sequence along the width direction of the enclosure 12 corresponding to the first guide surface 21 and are used for being matched, positioned and fixed with the arc surface 121 of the enclosure 12, and at least one installation column 24 is arranged at one end, away from the first guide surface 21, corresponding to the second guide surface 22 and is used for being fixed with the enclosure plane 122, located on the air outlet 11 side, of the enclosure 12 of the volute casing 10.

As shown in fig. 1, the number of the mounting posts 24 is three, which are respectively a first mounting post 241 and a second mounting post 242 disposed on the first guiding surface 21 and facing the enclosure 12, and a third mounting post 243 disposed on the second guiding surface 22 and extending toward the enclosure 12, wherein the first mounting post 241 is connected corresponding to a first hole 251 on the enclosure 12, the second mounting post 242 is connected corresponding to a second hole 252 on the enclosure 12, and the third mounting post 243 is connected corresponding to a third hole 253 on the enclosure 12. Each mounting post 24 is mounted in cooperation with a respective screw. The connection arrangement mode has the advantages of simple structure, easy implementation and direct and reliable connection effect.

In summary, the volute tongue structure 20 of the present embodiment can be separately arranged, so that the problem of uneven airflow with high speed in the middle of the outlet of the air duct and low speed on both sides can be solved, and outlet vortex can be eliminated. The saddle-shaped first guide surface 21 plays a role in improving pressure and efficiency brought by a deep/short volute tongue, and the V-shaped noise reduction groove 23 can dissipate eddy energy at the volute tongue and plays a certain role in reducing noise; the second guiding surface 22 functions as an airflow guiding function, and can smoothly guide the airflow 50 to the circular outlet of the outlet seat 30 (check valve seat) to flow out, so as to eliminate outlet eddy.

The present embodiment also provides a volute assembly comprising a volute 10 and the volute tongue structure 20 of the present embodiment mounted on the volute 10.

Specifically, the volute casing 10 includes two opposite enclosing plates 12 and two side plates 13 respectively connected between two ends of the two enclosing plates 12, wherein one of the enclosing plates 12 is formed with an arc surface 121 at a position close to the air outlet 11 of the volute casing 10, and the arc surface 121 is also a volute tongue of the enclosing plate 12. The volute tongue structure 20 can be detachably mounted on the shroud 12 of the volute 10 on which the volute tongue is formed. The specific installation manner of the volute tongue structure 20 can refer to the description of the volute tongue structure 20 of the present embodiment.

The volute assembly of the present embodiment has the same advantages as the volute tongue structure 20 provided by the present embodiment.

The embodiment also provides a fan, and the fan comprises the volute assembly provided by the embodiment.

Wherein, the fan also comprises an impeller 40 and other components arranged in the volute 10.

The blower of the present embodiment has the same advantages as the volute tongue structure 20 and the volute assembly provided by the present embodiment.

The present embodiment further provides an air duct device, which includes the volute assembly provided in the present embodiment or the fan provided in the present embodiment.

The air duct device of the present embodiment has the same beneficial effects as the volute tongue structure 20, the volute component and the fan provided by the present embodiment.

Further, the air duct device further comprises an air outlet seat 30 arranged at the air outlet 11 of the volute 10, a flow channel 60 is arranged in the air outlet seat 30, an air inlet of the flow channel 60 is correspondingly connected with the air outlet 11 of the volute 10, and an air outlet of the flow channel 60 is used for being connected with a smoke exhaust pipe.

It will be appreciated that the outlet socket 30 is a structure for connecting the smoke evacuation duct to the volute 10, which may form a check valve in combination with a check assembly. Generally, the outlet 11 of the volute 10 is square, and the cross section of the smoke exhaust pipe is circular, so the outlet seat 30 should be able to function as a square to a circle. In the air duct device of the present embodiment, the air outlet seat 30 has a square inlet 31 and a circular outlet 32, the square inlet 31 is used for connecting with the air outlet 11 of the volute casing 10, and the circular outlet 32 is used for connecting with the smoke exhaust pipe, so that the air outlet seat 30 can be better connected with the volute casing 10 and the smoke exhaust pipe.

Specifically, the flow channel 60 includes a first flow channel 33 and a second flow channel 35 sequentially connected and circulating along the flow direction of the airflow 50, the lower end of the first flow channel 33 is adapted to match with the square air outlet 11 of the scroll casing 10, and the upper end of the second flow channel 35 is adapted to match with the circular air inlet of the smoke exhaust pipe. In the flow direction of the airflow 50: the first flow passage 33 and the second flow passage 35 both gradually contract inwards, the section of the first flow passage 33 gradually and smoothly transitions to the section corresponding to the air inlet of the second flow passage 35, the section of the second flow passage 35 gradually and smoothly transitions to the section corresponding to the air outlet of the second flow passage 35, and a transition crease line is formed in the circumferential direction of the flow passage 60 at the connecting position of the air outlet of the second flow passage 35 and the air inlet of the first flow passage 33.

It can be understood that, the shape of the first flow channel 33 gradually transits from the air inlet to the air outlet to the air inlet of the second flow channel, and the shape of the second flow channel 35 gradually transits from the air inlet to the air outlet of the air outlet seat 30, so that the airflow 50 can gradually change in the first flow channel 33 and the second flow channel 35, the impact of the airflow 50 on the air outlet seat 30 is reduced, and the noise is reduced. Meanwhile, a transition crease line is formed at the connecting position of the air outlet of the first flow passage 33 and the air inlet of the second flow passage 35, which indicates that the gradual change amplitude of the position of the first flow passage 33 in the circumferential direction is different from that of the position of the second flow passage 35 above the first flow passage 33; in other words, the outlet seat 30 forms the upper and lower flow channels 60 with different gradual change amplitudes to better adapt to the flow of the airflow 50 at different stages.

In the air duct device of this embodiment, the inner wall of the flow channel 60 corresponding to the position of at least one surrounding plate 12 of the two surrounding plates 12 of the volute casing 10 is an arc-shaped surface, the arc-shaped surface is an outwardly convex arc-shaped surface along the circumferential direction of the flow channel 60, and the inner wall of the flow channel 60 corresponding to the position of at least one side plate 13 of the two side plates 13 of the volute casing 10 is a plane.

Specifically, in one implementation, as shown in fig. 9 to 12, the air outlet seat 30 includes a main body portion, the main body portion includes a first sidewall 61, a second sidewall 62, a third sidewall 63, and a fourth sidewall 64, which are sequentially connected in a ring shape, and a flow channel 60 is formed in the first sidewall 61, the second sidewall 62, the third sidewall 63, and the fourth sidewall 64; the first side wall 61 is correspondingly arranged above the enclosing plate 12 opposite to the volute tongue of the volute 10, the third side wall 63 is correspondingly arranged above the enclosing plate 12 where the volute tongue of the volute 10 is located, the second side wall 62 and the fourth side wall 64 are respectively arranged corresponding to the positions where the two side plates 13 of the volute 10 are located, the first side wall 61 and the third side wall 63 are both arc-shaped plates protruding outwards along the circumferential direction of the flow channel 60, and the second side wall 62 and the fourth side wall 64 are both flat plates.

It will be appreciated that the first side wall 61 is arcuate to facilitate the flow of the air stream 50 in a square-to-round manner. The third side wall 63 is configured to conform to the volute tongue structure 20 on the corresponding side in an arc shape, and the second side wall 62 and the fourth side wall 64 continue to be planar plates in accordance with the planar shape of the side plate 13 of the volute 10, which is beneficial to the airflow 50 flowing out from the air outlet 11 of the volute 10 and continuing to flow along the original direction, so that the impact caused by the rapid turning of the airflow 50 can be reduced, and the noise can be reduced.

In a specific structure of the flow channel 60, in this embodiment, the first sidewall 61 includes a first sub-wall 331 and a second sub-wall 351 sequentially arranged along the flow direction of the airflow 50, the second sidewall 62 includes a third sub-wall 332 and a fourth sub-wall 352 sequentially arranged along the flow direction of the airflow 50, the third sidewall 63 includes a fifth sub-wall 333 and a sixth sub-wall 353 sequentially arranged along the flow direction of the airflow 50, the fourth sidewall 64 includes a seventh sub-wall 334 and an eighth sub-wall 354 sequentially arranged along the flow direction of the airflow 50, the first sub-wall 331, the third sub-wall 332, the fifth sub-wall 333 and the seventh sub-wall 334 are sequentially connected to form the first flow channel 33, and the second sub-wall 351, the fourth sub-wall 352, the sixth sub-wall 353 and the eighth sub-wall 354 are sequentially connected to form the second flow channel 35.

The first sub-wall 331, the second sub-wall 351, the fifth sub-wall 333 and the sixth sub-wall 353 are all arranged in an outwardly convex arc shape along the circumferential direction of the flow channel 60. To facilitate the rounding, the first sub-wall 331 is inwardly recessed in an arc shape in the flow direction of the air flow 50, and the fifth sub-wall 333 is outwardly protruding in the flow direction of the air flow 50. Wherein the recess of the first sub-wall 331 is larger than the projection of the fifth sub-wall 333 to retract the first flow channel 33 in the flowing direction of the air flow 50. The second sub-wall 351 is perpendicular to the plane of the outlet 11 of the scroll casing 10, and the sixth sub-wall 353 is inclined outwardly away from the center of the flow passage 60 along the flow direction of the airflow 50, i.e. the second sub-wall 351 may be substantially vertical or slightly inwardly contracted along the flow direction of the airflow 50. The sixth sub-wall 353 is provided to slightly protrude outward in the flow direction of the air flow 50.

The first sub-wall 331, the second sub-wall 351, the fifth sub-wall 333 and the sixth sub-wall 353 all extend smoothly along the flow direction of the airflow 50, an included angle between a connecting line between the upper end and the lower end of the first sub-wall 331 and a plane (approximately horizontal plane) where the air outlet 11 of the scroll casing 10 is located is smaller than an included angle between a connecting line between the upper end and the lower end of the second sub-wall 351 and the plane where the air outlet 11 of the scroll casing 10 is located, that is, a variation amplitude (i.e., inward shrinkage rate in the present embodiment) of the first sub-wall 331 in the radial direction of the flow channel 60 along the flow direction of the airflow 50 is larger than a variation amplitude (i.e., inward shrinkage rate, and substantial inward shrinkage rate of the second sub-wall is approximately zero), so as to form a first trace line between the first sub-wall 331 and the second sub-wall 351. An included angle between a connecting line between the upper end and the lower end of the fifth sub-wall 333 and the plane where the air outlet 11 of the scroll casing 10 is located is smaller than an included angle between a connecting line between the upper end and the lower end of the sixth sub-wall 353 and the plane (horizontal plane) where the scroll casing 10 is located, that is, a variation amplitude (i.e., an outward expansion rate in this embodiment) of the fifth sub-wall 333 in the radial direction of the flow channel 60 along the flow direction of the airflow 50 is larger than a variation amplitude (i.e., an outward expansion rate in this embodiment, referring to fig. 12, an outward inclination of the fifth sub-wall 333 is larger than that of the sixth sub-wall 353) of the sixth sub-wall 353 in the radial direction of the flow channel 60, so that a third scoreline is formed between the fifth sub-wall 333 and the sixth sub-wall 353.

The third sub-wall 332, the fourth sub-wall 352, the seventh sub-wall 334 and the eighth sub-wall 354 are all plane plates, the third sub-wall 332 and the seventh sub-wall 334 are all arranged perpendicular to the plane of the air outlet 11 of the scroll casing 10, and the fourth sub-wall 352 and the eighth sub-wall 354 are arranged close to each other and retracted inwards. A second score line is formed between third sub-wall 332 and fourth sub-wall 352 and a fourth score line is formed between seventh sub-wall 334 and eighth sub-wall 354. The first crease line, the second crease line, the third crease line and the fourth crease line are sequentially connected at the beginning to form a transition crease line. Wherein the upper ends of the first sub-wall 331, the third sub-wall 332, the fifth sub-wall 333 and the seventh sub-wall 334 are arranged in a flush manner, so that the closed-loop transitional crease lines formed at the same horizontal level, namely the connection of the first flow passage 33 and the second flow passage 35, are approximately parallel to the horizontal plane.

As shown in fig. 17, the shape of the first sub-wall 331, following the orientation of the shroud 12 on the opposite side of the volute 10 from the volute tongue, facilitates the flow of air from the volute 10 to continue along the original path. The first sub-wall 331 of the first flow channel 33 of the air outlet seat 30 is smoothly connected with the outlet side of the enclosure plate 12 of the volute 10, specifically, the connection is in tangential transition, that is, the lower end of the first sub-wall 331 is in tangential transition connection with the upper side of the enclosure plate 12 opposite to the volute tongue of the volute 10, so as to firstly maintain a distance in the direction of the airflow 50 at the air outlet 11 of the volute 10, and play a role in preventing the premature flow separation of the gas and reducing the flow separation noise of the gas; and then smoothly transitions with the airflow guiding surface of the second sub-wall 351 of the second flow passage 35, so that the inclined airflow 50 flowing out along the volute 10 is smoothly guided along an arc line to be discharged upwards, and the flow resistance is reduced. Similarly, the third sub-wall 332 of the first flow channel 33 further extends along the volute tongue of the shroud 12, and then smoothly transitions with the airflow guiding surface of the fourth sub-wall 352 of the second flow channel 35, so as to achieve the purpose of smoothly guiding the inclined airflow 50 flowing out along the volute 10 to be discharged upwards along an arc, uniformly diffusing, reducing flow separation, and reducing the separation noise of the airflow 50.

The fifth sub-wall 333 and the sixth sub-wall 353 protrude outwards and conform to the airflow 50 of the volute tongue structure 20, so that the airflow 50 can be slowly diverted, and the impact effect of the airflow 50 is reduced; and the fifth sub-wall 333 with larger change amplitude firstly carries out larger turning, and then the sixth sub-wall 353 carries out gentle combing, so that the agitation of the airflow 50 is greatly relieved.

In the present example, as shown in fig. 12, in the flow direction of the airflow 50, the lengths of the second sub-wall 351 and the sixth sub-wall 353 along the circumferential direction of the flow channel 60 are gradually lengthened, and the lengths of the fourth sub-wall 352 and the eighth sub-wall 354 along the circumferential direction of the flow channel 60 are gradually shortened, so as to better match the circular smoke exhaust pipe. The upper end of the first sub-wall 331 is aligned with the lower end of the second sub-wall 351, and the upper end of the fifth sub-wall 333 is aligned with the lower end of the sixth sub-wall 353. The upper end of the third sub-wall 332 is aligned with the lower end of the fourth sub-wall 352, and the upper end of the seventh sub-wall 334 is aligned with the lower end of the eighth sub-wall 354 to form a smooth transition.

The inclination angles of the fourth sub-wall 352 and the eighth sub-wall 354 are not greater than 5 degrees, and may be 1 degree, 2 degrees, 3 degrees, 4 degrees and 5 degrees.

As shown in fig. 17, the height H from the upper end to the lower end of the outlet seat 30 is greater than the distance D between the third sub-wall 332 and the seventh sub-wall 334, and the distance D between the third sub-wall 332 and the seventh sub-wall 334 is greater than the maximum width D of the outlet 11 of the scroll 10.

The distance D between the third sub-wall 332 and the seventh sub-wall 334 is also the bottom width of the outlet seat 30, and the distance D between the third sub-wall 332 and the seventh sub-wall 334 is greater than the maximum width D of the outlet 11 of the scroll casing 10, so that the outlet seat 30 can completely cover the outlet 11 of the scroll casing 10, and the sealed connection between the outlet seat 30 and the scroll casing 10 is facilitated. 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 sub-wall 351 and the fourth sub-wall 352, so that the air flow 50 flowing out of the air outlet 11 of the scroll casing 10 and having a certain inclination angle can be ensured, and the air flow does not directly collide with the front wall surface of the air outlet seat 30; and because of the heightening of the height, the airflow 50 gradually transits to vertical air outlet in the air outlet seat 30, and the airflow 50 is smoothly guided and discharged upwards, so that the airflow 50 is prevented from directly changing into vertical air outlet after obliquely flowing out from the spiral case 10, and the purposes of reducing circulation resistance and improving air outlet efficiency are achieved.

The air outlet seat 30 further comprises a first connecting seat 71 and a second connecting seat 72, the first connecting seat 71 is provided with an inlet 31, the second connecting seat 72 is provided with an outlet 32, the inlet 31, the flow channel 60 and the outlet 32 are sequentially communicated, the first connecting seat 71 is connected to one end, located at the air inlet of the flow channel 60, of the main body, the second connecting seat 72 is connected to one end, located at the air outlet 11 of the flow channel 60, of the main body, the first connecting seat 71 is suitable for being connected with a connecting portion of the air outlet 11 of the volute 10, and the second connecting seat 72 is suitable for being connected with a smoke exhaust pipe.

The inlet 31 is disposed in a square shape, and four inner walls of the inlet 31 are respectively and smoothly connected between the four sidewalls of the air outlet 11 of the scroll casing 10 and the lower end of the first sidewall 61, the lower end of the second sidewall 62, the lower end of the third sidewall 63, and the lower end of the fourth sidewall 64. Specifically, the tops of the four inner walls of the inlet 31 are respectively disposed corresponding to and smoothly transitionally connected with the lower end of the first side wall 61, the lower end of the second side wall 62, the lower end of the third side wall 63, and the lower end of the fourth side wall 64, and are smoothly transitionally connected with the four side walls of the air outlet 11 of the scroll casing 10, so that the air flow 50 smoothly flows at the connection between the air outlet 11 of the scroll casing 10 and the air outlet seat 30. The outlet 32 is circular, and the inner side wall of the outlet 32 is smoothly and transitionally connected with the upper end of the first side wall 61, the upper end of the second side wall 62, the upper end of the third side wall 63 and the upper end of the fourth side wall 64, so that the airflow 50 can smoothly flow out of the smoke exhaust pipe.

Eight surfaces including the first sub-wall 331, the second sub-wall 351, the third sub-wall 332, the fourth sub-wall 352, the fifth sub-wall 333, the sixth sub-wall 353, the seventh sub-wall 334 and the eighth sub-wall 354 enclose between the inlet 31 and the outlet 32 of the air outlet seat 30 of the air duct device of the embodiment, and eight ridge lines are formed at the connection positions of the eight curved surfaces, which are respectively 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. The eight ridge line control air outlet seats 30 form an airflow 50 guiding structure on the wall surface; the lower end lines of the four faces of the first sub-wall 331, the third sub-wall 332, the fifth sub-wall 333 and the seventh sub-wall 334 correspond to the four lines of the air outlet 11 of the scroll casing 10, the upper end lines of the four faces of the second sub-wall 351, the fourth sub-wall 352, the sixth sub-wall 353 and the eighth sub-wall 354 are piecewise circular arcs, the lower end lines are quadrilateral lines corresponding to the air outlet 11 of the scroll casing 10, and the first sub-wall 331, the third sub-wall 332, the fifth sub-wall 333 and the seventh sub-wall 334 are vertically connected with the curved faces of the second sub-wall 351, the fourth sub-wall 352, the sixth sub-wall 353 and the eighth sub-wall 354 to form four transitional crease lines at the connecting parts. The air outlet seat 30 has a plurality of curved surfaces, which form a first flow channel 33 for the air flow 50 to flow out along the spiral case 10 and a second flow channel 35 for smoothly and upwardly guiding the air flow 50 in the cavity of the air outlet seat 30, and the smooth transition between the air outlet 11 of the spiral case 10 and the air outlet seat 30 reduces the wind resistance, reduces the noise, improves the air duct efficiency, and improves the air exhaust pressure. The problem of current side suction formula range hood's spiral case 10 for inclining place, and air outlet seat 30 is vertical, and airflow 50 is turned into vertical flow by force after the slope of spiral case 10 flows out, and this kind of unsmooth transition leads to exhausting windage to increase, and the noise rises.

In summary, the air duct device of the present embodiment has the split volute tongue structure 20 installed at the arc surface 121 of the volute casing 10, and has the air outlet seat 30 that extends smoothly along the profile of the air outlet 11 of the volute casing 10 and guides the air flow 50 in the inner cavity thereof, so as to have the effects of high efficiency and low noise.

The present embodiment further provides a range hood, which includes the fan provided in the present embodiment or the air duct device provided in the present embodiment.

As shown in fig. 17, a specific range hood may be a side-draft range hood, in which a fan is obliquely disposed in a box of the range hood, an air outlet 11 of a volute 10 of the fan is substantially horizontally disposed, and an air outlet seat 30 is substantially vertically mounted on the air outlet 11 of the volute 10. Wherein the arrows a of fig. 17 indicate the flow direction of the air flow 50.

The range hood of the present embodiment has the same beneficial effects as the volute tongue structure 20, the volute 10, the fan or the air duct device provided by the present embodiment.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the utility model has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (18)

1. The volute tongue structure is used for being installed on a surrounding plate (12) provided with a volute tongue of a volute (10) and is arranged corresponding to the volute tongue of the volute (10), and is characterized by comprising a volute tongue body, wherein a first guide surface (21) and a second guide surface (22) are sequentially arranged on the volute tongue body along the flowing direction of airflow (50), the first guide surface (21) and the second guide surface (22) are both used for being arranged facing an airflow channel of the volute (10), and a noise reduction groove (23) is formed between the first guide surface (21) and the second guide surface (22).

2. The volute tongue structure of claim 1, wherein the first guide surface (21) is curved and/or the second guide surface (22) is curved.

3. The volute tongue structure of claim 2, wherein, in the direction of flow of the airflow (50): the second guide surface (22) is arranged in an arc shape which is recessed away from the airflow channel;

and/or;

in the width direction of the shroud (12): the second guide surface (22) is arranged in an arc shape which is recessed away from the airflow channel.

4. The volute tongue structure of claim 3, wherein, in the width direction of the shroud (12): the second guide surface (22) is arranged in a circular arc shape, and the middle point of the circular arc shape of the second guide surface (22) deviates from the center of the enclosing plate (12) in the width direction.

5. The volute tongue structure of claim 2, wherein, in the direction of flow of the airflow (50): the first guide surface (21) is arranged in an arc shape protruding towards the airflow channel;

and/or;

in the width direction of the shroud (12): the first guide surface (21) is arranged in an arc shape which is recessed away from the airflow channel.

6. The volute tongue structure of claim 5, wherein the first guide surface (21) is saddle-shaped.

7. The volute tongue structure of any of claims 1-6, wherein the edge of the first guide surface (21) adjacent to the second guide surface (22) is a first edge (211) and the edge of the second guide surface (22) adjacent to the first guide surface (21) is a second edge (221);

two opposite side walls of the noise reduction groove (23) are respectively connected with the first edge (211) and the second edge (221), and the noise reduction groove (23) is outwards sunken relative to the first edge (211) and the second edge (221) and deviates from the airflow channel.

8. The volute tongue structure of claim 7, wherein the noise reduction groove (23) is disposed therethrough in an extending direction of the first rim (211);

and/or;

the section of the noise reduction groove (23) is arranged in a V shape;

and/or;

the first rim (211) is located on a side of the second rim (221) near a center of the airflow passage.

9. The volute tongue structure of any one of claims 1-6, wherein the volute tongue body comprises a casing, the casing is in an open groove-shaped arrangement, a side of a bottom wall (26) of the casing facing away from the inside of the casing is arranged to face the airflow channel, and the first guide surface (21), the noise reduction groove (23) and the second guide surface (22) are formed on the bottom wall (26) of the casing;

the opening of the shell faces the enclosing plate (12), and the shell side wall (27) of the shell is used for being attached to the enclosing plate (12).

10. The volute tongue structure of claim 9, wherein a side of the bottom wall (26) of the housing facing the interior of the housing is provided with a mounting post (24), the mounting post (24) being configured to be fixedly connected to the shroud (12).

11. The volute tongue structure of claim 10, wherein the number of the mounting posts (24) is at least three, and at least two mounting posts (24) are arranged corresponding to the first guide surface (21) and spaced in sequence along the width direction of the shroud plate (12) for being matched and positioned with the arc surface (121) at the volute tongue of the volute (10); at least one mounting column (24) is arranged corresponding to one end of the second guide surface (22) far away from the first guide surface (21) and is used for being matched and fixed with a surrounding plate plane (122) on one side of the volute tongue close to the air outlet (11) of the volute (10).

12. A blower comprising a volute and a volute tongue structure according to any one of claims 1 to 11 mounted on the volute.

13. An air ducting device characterized in that it comprises a fan as claimed in claim 12.

14. The air duct device according to claim 13, further comprising an air outlet seat (30) disposed at an air outlet (11) of the volute (10), wherein a flow channel (60) is disposed in the air outlet seat (30), an air inlet of the flow channel (60) is correspondingly connected to the air outlet (11) of the volute (10), and an air outlet of the flow channel (60) is used for being connected to a smoke exhaust pipe.

15. The air duct device according to claim 14, characterized in that the outlet seat (30) comprises a main body portion including a first side wall (61), a second side wall (62), a third side wall (63) and a fourth side wall (64) connected in sequence in a ring shape, the first side wall (61), the second side wall (62), the third side wall (63) and the fourth side wall (64) forming the flow passage (60);

the first side wall (61) is correspondingly arranged above a surrounding plate (12) opposite to a volute tongue of the volute (10), the third side wall (63) is correspondingly arranged above the surrounding plate (12) where the volute tongue of the volute (10) is located, the second side wall (62) and the fourth side wall (64) are respectively arranged corresponding to positions where two side plates (13) of the volute (10) are located, the first side wall (61) and/or the third side wall (63) are/is arc-shaped plates protruding outwards along the circumferential direction of the flow channel (60), and the second side wall (62) and the fourth side wall (64) are both plane plates.

16. Air duct device according to claim 15, characterized in that the first side wall (61) comprises a first sub-wall (331) and a second sub-wall (351) arranged in sequence in the flow direction of the air flow (50), the second side wall (62) comprises a third sub-wall (332) and a fourth sub-wall (352) arranged in sequence in the flow direction of the air flow (50), the third side wall (63) comprises a fifth sub-wall (333) and a sixth sub-wall (353) arranged in sequence in the flow direction of the air flow (50), the fourth side wall (64) comprises a seventh sub-wall (334) and an eighth sub-wall (354) arranged in sequence in the flow direction of the air flow (50), the first sub-wall (331), the third sub-wall (332), the fifth sub-wall (333) and the seventh sub-wall (334) are connected in sequence to form the first flow channel (33), and the second sub-wall (351), the fourth sub-wall (352), The sixth sub-wall (353) and the eighth sub-wall (354) are sequentially connected to form a second flow passage (35);

the first sub-wall (331), the second sub-wall (351), the fifth sub-wall (333) and the sixth sub-wall (353) are all arranged in an outward convex arc shape along the circumferential direction of the flow channel (60);

the third sub-wall (332), the fourth sub-wall (352), the seventh sub-wall (334) and the eighth sub-wall (354) are all plane plates, the third sub-wall (332) and the seventh sub-wall (334) are both perpendicular to the plane where the air outlet (11) of the volute (10) is located, and the fourth sub-wall (352) and the eighth sub-wall (354) are arranged in a mutually close and inward-contracting inclined manner.

17. Air duct device according to claim 16, characterized in that, in the flow direction of the air flow (50): the first sub-wall (331) is recessed inwards to form an arc shape, the fifth sub-wall (333) is gradually protruded outwards, the second sub-wall (351) is perpendicular to the plane of the air outlet (11) of the volute (10), and the sixth sub-wall (353) is gradually inclined outwards away from the center of the flow channel (60) along the flowing direction of the airflow (50);

and/or;

the lower end of the first sub-wall (331) is in tangential transition connection with the upper part of the enclosing plate (12) opposite to the volute tongue of the volute (10);

and/or;

the inclination angles of the fourth sub-wall (352) and the eighth sub-wall (354) are not more than 5 degrees;

and/or;

the height from the upper end to the lower end of the air outlet seat (30) is larger than the distance between the third sub-wall (332) and the seventh sub-wall (334), and the distance between the third sub-wall (332) and the seventh sub-wall (334) is larger than the maximum width of an air outlet (11) of the volute (10).

18. A range hood, comprising the fan of claim 12 or the air duct device of any one of claims 13 to 17.

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