Range hood and air inlet cover thereof

Abstract

The air inlet cover is used for being installed between a draught fan box and a smoke pipe of the range hood, the air inlet cover comprises an adapting part connected with the smoke pipe and an expanding part connected with the draught fan box, a platform part is further arranged between the expanding part and the adapting part, and the platform part is arranged on the smoke pipe in the flowing direction of smoke. Smoke in the smoke pipe can flow through the switching part, the platform part and the expansion part in sequence. According to the range hood and the air inlet cover thereof, the noise reduction performance of the range hood can be improved.

Description

Technical Field

[0001] This utility model relates to the field of kitchen appliance technology, and in particular to a range hood and its air inlet cover. Background Technology

[0002] Range hoods have become an indispensable kitchen appliance in modern homes. Their main function is to remove cooking fumes, thus maintaining a pleasant kitchen environment.

[0003] Common integrated range hoods have the following main drawbacks: the fan inevitably generates significant noise as it moves the fumes, resulting in a poor user experience while cooking. To overcome these issues, a split-type range hood has been proposed, achieving a certain level of noise reduction, but the noise reduction effect needs further enhancement. Utility Model Content

[0004] In view of the shortcomings of the existing technology, this utility model provides a range hood and its air inlet hood, which can improve the noise reduction performance of the range hood.

[0005] The specific technical solution of this utility model embodiment is as follows:

[0006] A range hood and its air inlet hood, the range hood and its air inlet hood comprising:

[0007] The air inlet hood is used to install between the fan box and the flue of the range hood. The air inlet hood includes a transition part connected to the flue and an enlargement part connected to the fan box. A platform part is also provided between the enlargement part and the transition part. Along the direction of flue gas flow, the flue gas in the flue can flow through the transition part, the platform part and the enlargement part in sequence.

[0008] In a preferred embodiment, the upper part of the adapter folds outward to form the platform part, and the outer edge of the platform part folds outward and extends upward to form the enlarged part.

[0009] In a preferred embodiment, the connection between the enlarged portion and the transition portion has a chamfer, which is located obliquely below the air inlet of the fan casing.

[0010] In a preferred embodiment, the fan is a dual-inlet fan, the centerline of the fan impeller is perpendicular to the wall, and the guide angle includes a front guide angle and a rear guide angle. The front guide angle is located diagonally below the front air inlet of the dual-inlet fan, and the rear guide angle is located diagonally below the rear air inlet of the dual-inlet fan.

[0011] In a preferred embodiment, the inner and / or outer surfaces of the enlarged portion are provided with reinforcing ribs.

[0012] In a preferred embodiment, the enlarged portion has a rectangular cross-section and has opposing left and right walls, opposing front and rear walls. The inner surface of the enlarged portion is provided with reinforcing ribs on the front and rear walls, and the outer surface of the enlarged portion is provided with reinforcing ribs on the left and right walls.

[0013] In a preferred embodiment, the enlarged portion has a rectangular cross-sectional profile, and has opposing left and right walls, opposing front and rear walls. The inner surface of the enlarged portion is provided with reinforcing ribs on the left and right walls, and the outer surface of the enlarged portion is provided with reinforcing ribs on the front and rear walls.

[0014] In a preferred embodiment, the adapter is used to insert into the upper part of the flue, and the outer surface of the adapter is non-removably and sealed to the inner surface of the upper part of the flue or detachably and sealed. Alternatively, the upper part of the flue is used to insert the adapter, and the inner surface of the adapter is non-removably and sealed to the outer surface of the upper part of the flue or detachably and sealed. Or, the adapter is integrally formed with the upper part of the flue.

[0015] In a preferred embodiment, the enlarged portion is provided with a mounting structure for sealing connection with the fan box near the transition portion.

[0016] In a preferred embodiment, the mounting structure includes a circumferentially formed groove along the inner surface of the enlargement, and a seal located within the circumferential groove.

[0017] In a preferred embodiment, the upper part of the enlarged portion is provided with an enlarged diameter section, which is used to surround the periphery of the fan box and coincide with the height of the fan box; the bottom surface of the enlarged diameter section is used to form the bottom of the limiting groove, and a stop portion is provided on the bottom edge of the side of the enlarged diameter section away from the side of the enlarged diameter section.

[0018] In a preferred embodiment, the stop portion includes: a stop ring having a first predetermined height and continuously arranged along the circumference, and / or, a stop plate having a second predetermined height and spaced apart along the circumference.

[0019] In a preferred embodiment, the first predetermined height is smaller than the second predetermined height.

[0020] In a preferred embodiment, the stop portion includes: a retaining ring having a first predetermined height and continuously arranged along the circumference; a plug-in portion extending upward from the retaining ring at a third predetermined height; a flange is provided at the lower end of the fan box; a plug hole matching the plug-in portion is provided on the flange; and the plug-in portion and the plug hole cooperate to form a plug-in mechanism.

[0021] In a preferred embodiment, the enlarged portion has a rectangular cross-section and has opposing left and right walls, as well as opposing front and rear walls. The inner surface of the enlarged portion is provided with reinforcing ribs on the front and rear walls, and the outer surface of the enlarged portion is provided with reinforcing ribs on the left and right walls. The retaining ring has at least one slot for guiding oil at a position corresponding to the left and right walls.

[0022] In a preferred embodiment, the mounting structure further includes a plurality of reinforcing bosses spaced circumferentially along the expanded diameter section, the reinforcing bosses being provided with mounting holes for engaging with the connector.

[0023] In a preferred embodiment, the air inlet shroud is a plastic air inlet shroud or a metal air inlet shroud.

[0024] A range hood, the range hood comprising an air inlet hood as described in any of the above descriptions.

[0025] In a preferred embodiment, the range hood further includes a fan box, a flue, and a smoke collection chamber, wherein the fan box, the air inlet hood, the flue, and the smoke collection chamber are arranged close to the vertical wall and connected sequentially from top to bottom.

[0026] In a preferred embodiment, the centerline of the impeller of the fan box is perpendicular to the vertical wall, or the angle between the centerline of the impeller and the vertical wall is greater than or equal to 45° and less than 90°.

[0027] In a preferred embodiment, the centerline of the inlet of the fan box is perpendicular to the axis of the fan impeller.

[0028] The technical solution of this utility model has the following significant beneficial effects:

[0029] This application provides an air inlet hood, which is installed between the fan housing and the flue of a range hood to efficiently guide the flue gas from the flue into the fan housing. The air inlet hood includes: a transition section connected to the flue, an enlarged section connected to the fan housing, and a platform section disposed between the enlarged section and the transition section. The flow area of ​​the enlarged section is larger than that of the transition section. When the flue gas in the flue enters the fan housing through the air inlet hood, the sudden increase in flow area quickly reduces the speed and resistance of the flue gas flow, optimizes the flow field of the flue gas, and helps reduce noise, thereby improving the noise reduction performance of the range hood. Furthermore, by optimizing the material of the air inlet hood, the cost of the range hood can be effectively reduced.

[0030] Specific embodiments of the present invention are disclosed in detail with reference to the following description and accompanying drawings, indicating how the principles of the present invention can be adopted. It should be understood that the embodiments of the present invention are not limited in scope. Within the spirit and scope of the appended claims, embodiments of the present invention include many changes, modifications, and equivalents. Features described and / or shown for one embodiment may be used in the same or similar manner in one or more other embodiments, combined with features in other embodiments, or substituted for features in other embodiments. Attached Figure Description

[0031] The accompanying drawings described herein are for illustrative purposes only and are not intended to limit the scope of this invention in any way. Furthermore, the shapes and proportions of the components in the drawings are merely illustrative to aid in understanding the invention and do not specifically limit the shapes and proportions of the components. Those skilled in the art, under the guidance of this invention, can select various possible shapes and proportions to implement this invention according to specific circumstances.

[0032] Figure 1 This is a schematic diagram of the structure of a range hood provided in the embodiments of this application;

[0033] Figure 2 This is a schematic diagram of the structure of the air inlet hood of a range hood provided in the embodiments of this application. Figure 1 ;

[0034] Figure 3 This is a schematic diagram of the structure of the air inlet hood of a range hood provided in the embodiments of this application. Figure 2 ;

[0035] Figure 4 This is a front view of the air inlet hood of a range hood provided in the embodiments of this application;

[0036] Figure 5 This is a top view of the air inlet hood of a range hood provided in the embodiments of this application;

[0037] Figure 6 This is a left view of the air inlet hood of a range hood provided in the embodiments of this application;

[0038] Figure 7 for Figure 6 A cross-sectional view (AA) of the air inlet hood of a type of range hood;

[0039] Figure 8 This is an exploded view of a range hood provided in the embodiments of this application;

[0040] Figure 9This is a schematic diagram of the fan box of a range hood provided in the embodiments of this application.

[0041] Reference numerals in the figures of this application:

[0042] 1. Fan box;

[0043] 102. Air vent;

[0044] 103. Fan box inlet;

[0045] 12. Mounting holes;

[0046] 2. Air inlet hood;

[0047] 20. Platform Department;

[0048] 21. Adapter section;

[0049] 22. Enlarged section;

[0050] 221. Left wall;

[0051] 222. Right wall;

[0052] 223. Anterior wall;

[0053] 224. Posterior wall;

[0054] 220. Expanded diameter section;

[0055] 2201. Reinforced boss;

[0056] 231. Leading angle;

[0057] 232. Backward guide angle;

[0058] 24. Reinforcing ribs;

[0059] 25. Stop section;

[0060] 26. Limiting groove;

[0061] 27. Grooving;

[0062] 251. Baffle plate;

[0063] 250. Retaining ring;

[0064] 3. Smoke pipe;

[0065] 4. Smoke collection chamber;

[0066] X, left and right directions;

[0067] Y, forward / backward direction;

[0068] Z, altitude direction. Detailed Implementation

[0069] The technical solution of this utility model will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that these embodiments are only used to illustrate this utility model and are not intended to limit the scope of this utility model. After reading this utility model, any modifications of this utility model in various equivalent forms by those skilled in the art will fall within the scope defined by the appended claims.

[0070] It should be noted that when an element is referred to as being "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0071] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0072] This utility model provides a range hood and its air inlet cover, which can improve the noise reduction performance of the range hood.

[0073] Please refer to the following for comprehensive information. Figures 1 to 8 This application specification provides an air inlet hood 2 for a range hood. The air inlet hood 2 is used to install between the fan box 1 and the flue 3 of the range hood. The air inlet hood 2 may include: a transition part 21 connected to the flue 3 and an enlargement part 22 connected to the fan box 1. A platform part 20 is also provided between the enlargement part 22 and the transition part 21. Along the direction of flue gas flow, the flue gas in the flue 3 can flow through the transition part 21, the platform part 20 and the enlargement part 22 in sequence.

[0074] like Figure 1 As shown, in this embodiment, the air inlet hood 2 is installed between the fan box 1 and the flue 3 of the range hood, and is used to reasonably guide the flue gas in the flue 3 into the fan box 1.

[0075] Please refer to the following: Figure 2 , Figure 3 and Figure 4Specifically, the air inlet hood 2 may include: a transition section 21 connected to the flue pipe 3, an enlargement section 22 connected to the fan housing 1, and a platform section 20 disposed between the enlargement section 22 and the transition section 21. The flow area of ​​the enlargement section 22 is larger than that of the transition section 21. When the flue gas in the flue pipe 3 enters the fan housing 1 through the air inlet hood 2, the increased flow area reduces the speed and resistance of the flue gas flow, optimizes the flow field of the flue gas, and helps to reduce noise, thereby improving the noise reduction performance of the range hood.

[0076] In this embodiment, the air inlet hood 2 can be a single, hollow, variable-section hood with a certain wall thickness. Specifically, the air inlet hood 2 is a plastic or metal air inlet hood. Of course, the material of the air inlet hood 2 can also be other types, and is not limited to the above description. Those skilled in the art, inspired by the technical essence of this application, may make other modifications, but as long as the function and effect achieved are the same as or similar to this application, they should all be covered within the scope of protection of this application. In this embodiment, the air inlet hood 2 is mainly illustrated by being made of plastic. When the air inlet hood 2 is a plastic air inlet hood, it can be integrally injection molded, which not only helps control the dimensional accuracy of various positions of the air inlet hood 2, but also helps reduce manufacturing costs and processing complexity and difficulty.

[0077] The adapter 21 of the air inlet hood 2 is mainly used to adapt to the upper part of the flue duct 3. The specific structure of the adapter 21 can match the structure of the upper end of the flue duct 3. For example, when the cross-section of the upper end of the flue duct 3 is circular, the cross-section of the adapter 21 can also be circular; when the cross-section of the upper end of the flue duct 3 is rectangular, the cross-section of the adapter 21 can also be rectangular. Of course, the structure of the flue duct 3 or the adapter 21 is not limited to the above examples, and those skilled in the art can make other modifications as needed.

[0078] Specifically, the adapter 21 can be installed on the upper end of the flue pipe 3, or the adapter 21 can be integrally formed and set on the upper end of the flue pipe 3. When the adapter 21 is installed on the upper end of the flue pipe 3, the adapter 21 is used to insert into the upper part of the flue pipe 3, and the outer surface of the adapter 21 is non-removably and fixedly sealed or detachably and sealed to the inner surface of the upper part of the flue pipe 3. Alternatively, the upper part of the flue pipe 3 is used to insert the adapter 21, and the inner surface of the adapter 21 is non-removably and fixedly sealed or detachably and sealed to the outer surface of the upper part of the flue pipe 3.

[0079] The aforementioned non-removable fixed sealing connection can be achieved through a combination of adhesive sealing and screw or snap-fit ​​connections. The aforementioned detachable sealing connection can be achieved through a combination of sealing elements and screw or snap-fit ​​connections. Of course, the specific forms of the aforementioned non-removable fixed sealing connection or detachable sealing connection are not limited to the examples above. Those skilled in the art, inspired by the technical essence of this application, may make other modifications, but as long as the achieved function and effect are the same as or similar to this application, they should be covered within the scope of protection of this application. Furthermore, the adapter 21 can be integrally formed with the upper part of the flue 3. For example, both the flue 3 and the air inlet hood 2 are plastic parts, and they are integrally injection molded.

[0080] In some embodiments, the upper part of the adapter 21 is folded outward to form the platform 20, and the outer edge of the platform 20 is folded outward to extend upward to form the enlarged part 22.

[0081] In this embodiment, the platform portion 20 can be formed by folding upwards from the upper part of the adapter portion 21. When the air inlet shroud 2 is installed vertically along the height direction Z, the platform portion 20 can extend horizontally as a whole. Of course, considering manufacturing process and manufacturing precision, the platform portion 20 can also have a certain degree of inclination.

[0082] The platform section 20 has opposing inner and outer edges. The inner edge of the platform section 20 connects to the upper part of the transition section 21, and an enlarged section 22 is provided at the outer edge of the platform section 20. The enlarged section 22 can be formed by folding the outer edge of the platform section 20 and extending it upward. The enlarged section 22 is used to connect to the fan housing 1, and the overall structure of the enlarged section 22 can be adapted to the structure of the lower part of the fan housing 1. For example, when the lower cross-section of the fan housing 1 is rectangular or quasi-rectangular, the cross-section of the enlarged section 22 can also be rectangular or quasi-rectangular.

[0083] In one embodiment, the connection between the enlarged portion 22 and the transition portion 21 has a chamfer, which is located obliquely below the air inlet of the fan casing.

[0084] In this embodiment, by providing a chamfer at the connection between the enlarged portion 22 and the connecting portion, the flow of flue gas through this location can be improved, allowing the flue gas to smoothly turn along the chamfered curved surface, reducing the formation of eddies, thereby reducing noise generation, and guiding the flue gas more efficiently towards the air inlet of the fan casing with lower resistance.

[0085] Furthermore, by setting a chamfer at the connection between the enlarged portion 22 and the connecting portion, the mechanical properties of the air inlet shroud 2 at the variable cross-section position can be improved, and stress concentration at the sharp corner position can be avoided, thereby affecting the service life of the air inlet shroud 2.

[0086] like Figure 6 As shown, in one specific embodiment, the fan is a dual-inlet fan, the center line of the fan impeller is perpendicular to the wall, and the guide angle includes a front guide angle 231 and a rear guide angle 232. The front guide angle 231 is located obliquely below the front air inlet of the dual-inlet fan, and the rear guide angle 232 is located obliquely below the rear air inlet of the dual-inlet fan.

[0087] In this embodiment, the fan can be a dual-inlet fan, which has two air inlets along the direction of the impeller centerline.

[0088] In this embodiment, the example given is that the centerline of the fan impeller is perpendicular (or nearly perpendicular) to the wall surface. The perpendicularity of the impeller's centerline to the wall surface (referring to a vertical wall extending in the vertical direction) primarily indicates that the fan is installed vertically. When the fan is installed vertically, the impeller's centerline can be horizontal, and it is also possible that the impeller's centerline has an angle with the horizontal plane.

[0089] The enlarged portion 22 may have a rectangular cross-section and has opposing left and right walls 221 and 222, and opposing front and rear walls 223 and 224. A leading angle 231 may be provided between the lower part of the front wall 223 and the platform portion 20; a rear leading angle 232 may be provided between the lower part of the rear wall 224 and the platform portion 20. The leading angle 231 is located diagonally below the front air inlet of the dual-inlet fan, and the rear leading angle 232 is located diagonally below the rear air inlet of the dual-inlet fan. When the fan starts, the flue gas flowing in from the connection portion can be evenly distributed and, through the guiding effect of the leading angles 231 and 232, flows stably and efficiently towards the two air inlets of the fan.

[0090] Of course, in some embodiments, it is not excluded that a left guide angle may be provided between the lower part of the left wall 221 of the enlarged portion 22 and the platform portion 20, and / or a right guide angle may be provided between the lower part of the right wall 222 of the enlarged portion 22 and the platform.

[0091] like Figure 2 or Figure 3 or Figure 7 As shown, in some embodiments, the inner and / or outer surfaces of the enlarged portion 22 are provided with reinforcing ribs 24.

[0092] In this embodiment, in order to improve the structural strength of the enlarged portion 22, a reinforcing rib 24 can be provided on at least one of the inner and outer surfaces of the enlarged portion 22. For example, when the air inlet shroud 2 is integrally injection molded, the reinforcing rib 24 can also be integrally injection molded during the manufacturing process of the air inlet shroud 2, thereby greatly saving costs, shortening the manufacturing process, and ensuring the reliability of the reinforcing effect of the reinforcing rib 24 itself.

[0093] The reinforcing ribs 24 can be staggered on the inner and outer surfaces of the enlarged portion 22. This not only helps to ensure the overall strength of the enlarged portion 22, but also reduces the complexity of the mold, thereby reducing manufacturing costs and increasing the yield rate.

[0094] Please combine Figure 2 and Figure 5 As shown, in one embodiment, the enlarged portion 22 has a rectangular cross-section and has opposing left walls 221 and right walls 222, opposing front walls 223 and rear walls 224. The inner surface of the enlarged portion 22 is provided with reinforcing ribs 24 on the front wall 223 and the rear wall 224, and the outer surface of the enlarged portion 22 is provided with reinforcing ribs 24 on the left wall 221 and the right wall 222.

[0095] In this embodiment, the cross-section of the enlarged portion 22 can be rectangular, quasi-rectangular, or other structures. In the embodiments and drawings of this application, a rectangular cross-section of the enlarged portion 22 is primarily used as an example. When the cross-section of the enlarged portion 22 is rectangular, the enlarged portion 22 has opposing left and right walls 221 and 222, and opposing front and rear walls 223 and 224. Reinforcing ribs 24 can be provided on the inner surfaces of the front and rear walls 223 and 224, and on the outer surfaces of the left and right walls 221 and 222.

[0096] Taking the vertically mounted fan with the air inlets located on the front and rear sides as an example, when reinforcing ribs 24 are provided on the inner surfaces of the front wall 223 and rear wall 224 of the enlarged portion 22, the strength of the front wall 223 and rear wall can be increased by the reinforcing ribs 24. In addition, the reinforcing ribs 24 can also be used to guide the flue gas. For example, the reinforcing ribs 24 may include a plurality of reinforcing vertical ribs extending along the vertical direction Z of the enlarged portion 22 from top to bottom. The lower end of the reinforcing vertical ribs may extend to the platform portion 20, and the flue gas flowing into the connecting portion may flow upward along the guiding direction of the reinforcing vertical ribs to the air inlet of the fan.

[0097] The number of vertical reinforcing ribs can be determined based on the horizontal length of the front wall 223 and rear wall 224 of the enlarged portion 22, and this application does not impose a specific limitation on this. The reinforcing rib 24 may also include horizontal reinforcing ribs connected to all the vertical reinforcing ribs, thereby further ensuring the strength of the entire reinforced structure.

[0098] In another embodiment, the enlarged portion 22 has a rectangular cross-sectional profile and has opposing left and right walls 221 and 222, and opposing front and rear walls 223 and 224. The inner surface of the enlarged portion 22 is provided with reinforcing ribs 24 on the left and right walls 221 and the outer surface of the enlarged portion 22 is provided with reinforcing ribs 24 on the front and rear walls 223 and the rear wall 224.

[0099] In this embodiment, the main difference from the above embodiments is that the reinforcing rib 24 is set at a different location. Specifically, the reinforcing rib 24 can be set on the outer surface of the front wall 223 and the rear wall 224 of the enlarged portion 22, and on the inner surface of the left wall 221 and the right wall 222 of the enlarged portion 22.

[0100] like Figure 2 and Figure 7 As shown, in some embodiments, the enlarged portion 22 is provided with an installation structure for sealing connection with the fan housing 1 near the adapter portion 21.

[0101] In this embodiment, the enlarged portion 22 is provided with a mounting structure for sealing connection with the fan housing 1 near the transition portion 21. This mounting structure can seal the gap between the fan housing 1 and the enlarged portion 22, thereby preventing oil fumes from escaping from the gap between the fan housing 1 and the enlarged portion 22, preventing condensed oil from overflowing from the gap between the fan housing 1 and the enlarged portion 22, and preventing noise generated by the fan during operation from being transmitted outward from the gap between the fan housing 1 and the enlarged portion 22.

[0102] Specifically, the mounting structure may include a limiting groove 26 formed circumferentially along the inner surface of the enlarged portion 22, and a seal located within the limiting groove 26.

[0103] In this embodiment, a limiting groove 26 for mounting a seal can be formed on the inner surface of the enlarged portion 22. Specifically, the limiting groove 26 can be integrally formed on the inner surface of the enlarged portion 22, or it can be formed by mounting additional components on the inner surface of the enlarged portion 22. Taking the limiting groove 26 as an example of being integrally formed on the inner surface of the enlarged portion 22, the limiting groove 26 can be a circumferentially continuous stop ring formed on the inner surface of the enlarged portion 22, or a plurality of circumferentially discontinuous stop segments, or other forms. The seal can be a sealing ring that matches the size of the limiting groove 26.

[0104] Please refer to the following: Figure 2 , Figure 3 and Figure 4 Furthermore, the upper part of the enlarged portion 22 is provided with an enlarged diameter section 220, which is used to surround the periphery of the fan box 1 and coincide with the height of the fan box 1; the bottom surface of the enlarged diameter section 220 is used to form the bottom of the limiting groove 26, and a stop portion 25 is provided on the bottom edge of the side of the enlarged diameter section 220 away from the side of the enlarged diameter section 220.

[0105] In this embodiment, the upper part of the enlarged portion 22 has an expanded diameter section 220 surrounding the periphery of the fan housing 1. The fan housing 1 is typically a sheet metal part, while the air inlet hood 2 can be entirely made of plastic. When the air inlet hood 2 has an expanded diameter section 220 that overlaps in height with the periphery of the fan housing 1, the height of the fan housing 1 can be reduced, and this is compensated for by the height of the air inlet hood 2, thus helping to reduce the cost of the range hood. Furthermore, the expanded diameter section 220 being aligned in height with the fan housing 1 and sealed in place effectively adds a noise-blocking barrier around the fan housing 1, improving the noise reduction performance of the range hood.

[0106] In this embodiment, the expanded diameter section 220 has a bottom surface, which can be used to form the bottom of the limiting groove 26. A stop portion 25 is provided on the inner side of the bottom surface of the expanded diameter section 220, which can be used to limit the inner side of the seal. When the seal is installed in the limiting groove 26, the outer side of the seal contacts the side surface of the expanded diameter section 220, the inner side of the seal contacts the stop portion 25, the lower surface of the seal contacts the bottom surface of the expanded diameter section 220, and the upper surface of the seal can contact the lower end of the fan housing 1.

[0107] The stop portion 25 may include: a stop ring 250 having a first predetermined height and continuously arranged along the circumference, and / or a stop piece 251 having a second predetermined height and spaced apart along the circumference.

[0108] In this embodiment, the stop portion 25 may be in the form of a circumferentially continuous retaining ring 250, or the stop portion 25 may be in the form of a plurality of circumferentially spaced retaining plates 251. Alternatively, the stop portion 25 may also be in other forms that can reliably limit the inner side of the seal, or a combination of both, etc. The specific form of the stop portion 25 is not limited to the examples above. Those skilled in the art may make other modifications based on the technical essence of this application, but as long as the function and effect achieved are the same as or similar to those of this application, they should be covered within the scope of protection of this application.

[0109] like Figure 7 As shown, in one specific embodiment, the stop portion 25 may include: a stop ring 250 having a first predetermined height and continuously arranged along the circumference, and a stop piece 251 having a second predetermined height and spaced apart along the circumference. The first predetermined height is less than the second predetermined height.

[0110] In this embodiment, when the stop portion 25 is a combination of a retaining ring 250 and a baffle plate 251, the height of the stop portion 25 can be lower than the height of the baffle plate 251. For example, the height of the retaining ring 250 can be less than the thickness of the seal, and the height of the baffle plate 251 can be greater than the thickness of the seal. During use, the combination of the higher baffle plate 251 and the lower retaining ring 250 can reliably limit the seal. Furthermore, the height difference between the two facilitates the efficient downward flow of condensed oil inside the fan housing 1, preventing it from depositing between the stop portion 25 and the seal.

[0111] In one embodiment, the stop portion 25 may include: a retaining ring 250 having a first predetermined height and continuously arranged along the circumference, a plug-in portion extending upward from the retaining ring 250 at a third predetermined height, a flange provided at the lower end of the fan box 1, and a plug hole provided on the flange that matches the plug-in portion, wherein the plug-in portion and the plug hole cooperate to form a plug-in mechanism.

[0112] In this embodiment, the lower end of the fan box 1 and the stop portion 25 of the air inlet shroud 2 can also cooperate to form a plug-in mechanism. When the fan box 1 and the air inlet shroud 2 are engaged, the plug-in mechanism can ensure that the lower end of the fan box 1 reliably abuts against the sealing element.

[0113] Specifically, the stop portion 25 may include a circumferentially continuous retaining ring 250 with a first predetermined height, the height of which may be less than the thickness of the seal. An insertion portion with a third predetermined height may extend from the retaining ring 250, the sum of which is greater than the thickness of the seal, allowing the insertion portion to protrude beyond the seal. The lower end of the fan housing 1 may be provided with a flange, on which multiple insertion holes matching the insertion portions may be provided. The outline dimensions of these insertion holes may be slightly larger than the cross-sectional dimensions of the insertion portions, thereby facilitating efficient insertion of the insertion portions into the insertion holes. Furthermore, to ensure accurate and efficient insertion of the insertion portions into the insertion holes, guide angles may be provided on one or both sides of the end of the insertion portion.

[0114] In one specific embodiment, the enlarged portion 22 has a rectangular cross-section and has opposing left walls 221 and right walls 222, as well as opposing front walls 223 and rear walls 224. The inner surface of the enlarged portion 22 is provided with reinforcing ribs 24 on the front walls 223 and the rear walls 224, and the outer surface of the enlarged portion 22 is provided with reinforcing ribs 24 on the left walls 221 and the right walls 222. The retaining ring 250 has at least one slot 27 for guiding oil at the position corresponding to the left walls 221 and the right walls 222.

[0115] In this embodiment, the enlarged portion 22 has opposing front walls 223 and rear walls 224 along the front-rear direction Y. Along the left-right direction X, the enlarged portion 22 has opposing left walls 221 and right walls 222. Regarding the embodiment described above, where reinforcing ribs 24 are provided on the inner surfaces of the front walls 223 and rear walls 224 of the enlarged portion 22, and reinforcing ribs 24 are provided on the outer surfaces of the left walls 221 and right walls 222, considering that the left walls 221 and right walls 222 are areas with relatively low flue gas flow, oil may easily condense on the left walls 221 and right walls 222, forming oil adhering to the walls. To guide the oil downwards immediately, at least one slot 27 for guiding oil can be formed in the baffle ring 250 at positions corresponding to the left walls 221 and right walls 222. The bottom of the slot 27 can be flush with the bottom of the limiting slot 26. The number of slots 27 can be multiple, and the slots 27 and the insertion part can be alternately distributed on the left wall 221 and the right wall 222.

[0116] In addition, such as Figure 2 As shown, in one embodiment, the mounting structure may further include a plurality of reinforcing bosses 2201 spaced circumferentially along the expanded diameter section 220, wherein the reinforcing bosses 2201 are provided with mounting holes 12 for engaging with the connector.

[0117] In this embodiment, to ensure the reliability of the connection between the air inlet shroud 2 and the fan housing 1, the mounting structure may further include a connector and a mounting hole 12 that mates with the connector. To ensure the reliability of the connector connection, a reinforcing boss 2201 may be provided at the location where the mounting hole 12 is set. Specifically, the reinforcing boss 2201 may be a plurality of thickened structures with a greater thickness than those at other locations provided on the inner surface of the expanded diameter section 220. The number of reinforcing bosses 2201 may vary depending on the size of the air inlet shroud 2 and the connection strength requirements, and no specific numerical limit is made here.

[0118] like Figure 8 As shown in the figure, this application also provides a range hood, which includes the above-mentioned air inlet hood 2. By setting the air inlet hood 2, the range hood can achieve the technical effect achieved by the air inlet hood 2 embodiment. For details, please refer to the specific description of the above embodiment, which will not be repeated here.

[0119] In one embodiment, the range hood may further include a fan box 1, a flue 3, and a smoke collection chamber 4, wherein the fan box 1, the air inlet hood 2, the flue 3, and the smoke collection chamber 4 are arranged close to the vertical wall and connected sequentially from top to bottom.

[0120] In this embodiment, the range hood may include a fan housing 1, an air inlet hood 2, a flue 3, and a smoke collection chamber 4. The smoke collection chamber 4, flue 3, air inlet hood 2, and fan housing 1 can be arranged sequentially along the direction of smoke flow. Specifically, the air inlet hood 2, flue 3, air inlet hood 2, and fan housing 1 can be arranged vertically against a wall from bottom to top. The air inlet hood 2 is positioned relatively close to the user's cooking area to collect the smoke generated during cooking. The fan housing 1 contains a fan for suction of the smoke, and is positioned relatively away from the user's cooking area.

[0121] In one embodiment, the centerline of the impeller of the fan in the fan box 1 is perpendicular to the vertical wall, or the angle between the centerline of the impeller and the vertical wall is greater than or equal to 45° and less than 90°.

[0122] In this embodiment, the centerline of the impeller of the fan is perpendicular to the vertical wall, or the angle between the centerline of the impeller of the fan in the fan housing 1 assembly and the vertical wall is greater than or equal to 45° and less than 90°. Specifically, this means that the fan is installed vertically. When the fan is installed vertically, the centerline of the impeller can be horizontal or inclined at a small angle relative to the horizontal plane. When the centerline of the impeller is inclined at a small angle relative to the horizontal plane, the angle between the centerline of the impeller and the horizontal plane is within 45°.

[0123] In the embodiments and accompanying drawings of this application, the vertical installation of the fan is mainly used as an example for illustration. Other installation methods can be adapted to this application, and will not be described in detail here.

[0124] like Figure 9 As shown, the fan box 1 has a fan box inlet 103 for introducing flue gas and a fan box outlet 102 for discharging flue gas. For a vertically installed fan, the centerline of the fan box inlet 103 is perpendicular to the axis of the fan impeller. Specifically, the fan box inlet 103 can be set downwards to facilitate direct connection with the air inlet hood 2 and to facilitate assembly or disassembly operations by operators.

[0125] It should be noted that in the description of this application, the terms "first," "second," etc., are used only for descriptive purposes and to distinguish similar objects; there is no order between them, nor should they be construed as indicating or implying relative importance. Furthermore, in the description of this application, unless otherwise stated, "multiple" means two or more.

[0126] The various embodiments described in this specification are presented in a progressive manner. The same or similar parts between the embodiments can be referred to each other. Each embodiment focuses on the differences from other embodiments.

[0127] The above are merely a few embodiments of this utility model. Although the embodiments disclosed in this utility model are as described above, the content is only for the purpose of facilitating understanding of this utility model and is not intended to limit this utility model. Any person skilled in the art to which this utility model pertains may make any modifications and changes in the form and details of the embodiments without departing from the spirit and scope disclosed in this utility model. However, the patent protection scope of this utility model shall still be determined by the scope defined in the appended claims.

Claims

1. An air inlet hood, characterized in that, The air inlet hood is used to install between the fan box and the flue of the range hood. The air inlet hood includes a transition part connected to the flue and an enlargement part connected to the fan box. A platform part is also provided between the enlargement part and the transition part. Along the direction of flue gas flow, the flue gas in the flue can flow through the transition part, the platform part and the enlargement part in sequence.

2. The air inlet hood according to claim 1, characterized in that, The upper part of the adapter folds outward to form the platform part, and the outer edge of the platform part folds outward to extend upward to form the enlarged part.

3. The air inlet hood according to claim 2, characterized in that, The connection between the enlarged portion and the transition portion has a chamfer, which is located obliquely below the air inlet of the fan casing.

4. The air inlet hood according to claim 3, characterized in that, The fan is a dual-inlet fan. The center line of the impeller of the fan is perpendicular to the wall. The guide angle includes a front guide angle and a rear guide angle. The front guide angle is located diagonally below the front air inlet of the dual-inlet fan, and the rear guide angle is located diagonally below the rear air inlet of the dual-inlet fan.

5. The air inlet hood according to claim 1, characterized in that, The inner and / or outer surfaces of the enlarged portion are provided with reinforcing ribs.

6. The air inlet hood according to claim 5, characterized in that, The enlarged portion has a rectangular cross-section and has opposing left and right walls, and opposing front and rear walls. The inner surface of the enlarged portion is provided with reinforcing ribs on the front and rear walls, and the outer surface of the enlarged portion is provided with reinforcing ribs on the left and right walls.

7. The air inlet hood according to claim 5, characterized in that, The enlarged portion has a rectangular cross-sectional profile and has opposing left and right walls, and opposing front and rear walls. The inner surface of the enlarged portion is provided with reinforcing ribs on the left and right walls, and the outer surface of the enlarged portion is provided with reinforcing ribs on the front and rear walls.

8. The air inlet hood according to claim 1, characterized in that, The adapter is used to insert into the upper part of the flue. The outer surface of the adapter is fixedly and sealed to the inner surface of the upper part of the flue in a non-removable or detachable sealed connection. Alternatively, the upper part of the flue is used to insert the adapter. The inner surface of the adapter is fixedly and sealed to the outer surface of the upper part of the flue in a non-removable or detachable sealed connection. Or the adapter is integrally formed with the upper part of the flue.

9. The air inlet hood according to claim 1, characterized in that, The enlarged section has an installation structure near the transition section for sealing connection with the fan box.

10. The air inlet hood according to claim 9, characterized in that, The mounting structure includes a limiting groove formed circumferentially along the inner surface of the enlarged portion, and a seal located within the limiting groove.

11. The air inlet hood according to claim 10, characterized in that, The upper part of the enlarged section is provided with an enlarged diameter section, which is used to surround the periphery of the fan box and coincide with the height of the fan box; the bottom surface of the enlarged diameter section is used to form the bottom of the limiting groove, and a stop part is provided on the bottom edge of the side of the enlarged diameter section away from the side of the enlarged diameter section.

12. The air inlet hood according to claim 11, characterized in that, The stop portion includes: a stop ring having a first predetermined height and continuously arranged along the circumference, and / or, a stop plate having a second predetermined height and spaced apart along the circumference.

13. The air inlet hood according to claim 12, characterized in that, The first predetermined height is less than the second predetermined height.

14. The air inlet hood according to claim 11, characterized in that, The stop portion includes: a retaining ring having a first predetermined height and continuously arranged along the circumference; a plug-in portion extending upward from the retaining ring at a third predetermined height; a flange provided at the lower end of the fan box; a plug hole matching the plug-in portion is provided on the flange; and the plug-in portion and the plug hole cooperate to form a plug-in mechanism.

15. The air inlet hood according to claim 14, characterized in that, The enlarged portion has a rectangular cross-section and has opposing left and right walls, as well as opposing front and rear walls. The inner surface of the enlarged portion is provided with reinforcing ribs on the front and rear walls, and the outer surface of the enlarged portion is provided with reinforcing ribs on the left and right walls. The retaining ring has at least one slot for guiding oil at the position corresponding to the left and right walls.

16. The air inlet hood according to claim 11, characterized in that, The mounting structure also includes a plurality of reinforcing bosses spaced circumferentially along the expanded diameter section, and the reinforcing bosses are provided with mounting holes for mating with the connectors.

17. The air inlet hood according to claim 1, characterized in that, The air inlet cover can be a plastic air inlet cover or a metal air inlet cover.

18. A range hood, characterized in that, The range hood includes the air inlet hood as described in any one of claims 1 to 17.

19. The range hood according to claim 18, characterized in that, The range hood also includes a fan box, a flue, and a smoke collection chamber. The fan box, the air inlet hood, the flue, and the smoke collection chamber are arranged close to the vertical wall and connected sequentially from top to bottom.

20. The range hood according to claim 19, characterized in that, The centerline of the impeller of the fan in the fan box is perpendicular to the vertical wall, or the angle between the centerline of the impeller of the fan and the vertical wall is greater than or equal to 45° and less than 90°.

21. The range hood according to claim 19, characterized in that, The centerline of the inlet of the fan box is perpendicular to the axis of the fan impeller.

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