Range hood

Abstract

The utility model discloses a range hood which comprises a fan box, a smoke inlet cover, a smoke pipe and a lower cavity, and the fan box, the smoke inlet cover, the smoke pipe and the lower cavity are sequentially connected from top to bottom; the fan box is internally provided with a fan, the fan is used for being at least partially arranged above a ceiling, the smoke inlet cover is connected with the fan box at a joint, and the smoke inlet cover is in sealing fit with the lower part of the fan box through a sealing structure. According to the range hood provided by the embodiment of the invention, the performance of the split range hood can be further improved, such as the noise reduction performance, the oil seepage prevention performance and the installation adaptability.

Description

Technical Field

[0001] This utility model relates to the field of kitchen appliance technology, and in particular to a range hood. 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 degree of noise reduction.

[0004] However, the performance of split-type range hoods, such as noise reduction, oil leakage prevention, and installation compatibility, needs further improvement. Utility Model Content

[0005] In view of the shortcomings of the existing technology, the present invention provides a range hood that can further improve the performance of split range hoods, such as noise reduction performance, oil leakage prevention performance, or installation adaptability.

[0006] The specific technical solution of this utility model embodiment is as follows:

[0007] A range hood includes: a fan box, a smoke inlet hood, a smoke pipe, and a lower cavity, wherein the fan box, the smoke inlet hood, the smoke pipe, and the lower cavity are connected sequentially from top to bottom; the fan box contains a fan, which is at least partially installed above the ceiling; the smoke inlet hood is connected to the fan box at a connection point; and the lower part of the smoke inlet hood and the fan box are sealed and adapted to each other by a sealing structure.

[0008] In a preferred embodiment, the connection is higher in the height direction than the sealing structure.

[0009] In a preferred embodiment, the upper part of the smoke inlet hood covers the outside of the fan box, or the upper part of the smoke inlet hood extends into the inside of the fan box, or the upper end of the smoke inlet hood and the lower end of the fan box are connected to each other.

[0010] In a preferred embodiment, the smoke hood is connected to the outside of the fan box and covers at least part of the fan box.

[0011] In a preferred embodiment, the dimensions of at least a portion of the shielded fan box in the height direction are between 10 mm and 500 mm.

[0012] In a preferred embodiment, the wall of the smoke inlet hood is bent inward to form a flange, or the inner surface of the wall of the smoke inlet hood is provided with a flange. The flange is used to limit the lower part of the fan box, and the sealing structure is provided between the flange and / or the wall and the lower part of the fan box.

[0013] In a preferred embodiment, the flanged portion is provided with a socket, and the lower part of the fan box is provided with a plug; or, the flanged portion is provided with a plug, and the lower part of the fan box is provided with a socket.

[0014] In a preferred embodiment, a plug is provided on the flange, and the lower part of the fan box includes a flange extending into the fan box, and a socket is provided on the flange.

[0015] In a preferred embodiment, the wall of the smoke inlet hood is bent inward to form a groove, or the inner surface of the wall of the smoke inlet hood is provided with a groove, the groove being used to limit the lower part of the fan box, and the sealing structure being provided between the groove and / or the wall and the lower part of the fan box.

[0016] In a preferred embodiment, the groove has an oil-draining structure for guiding oil from the gap between the groove and the fan box into the interior of the fume hood.

[0017] In a preferred embodiment, the lower part of the fan box includes the lower part of the vertical side plate of the fan box, or an inwardly extending or outwardly extending flange connected to the vertical side plate of the fan box, or a bent portion formed by first extending inward and then bending downward connected to the vertical side plate of the fan box.

[0018] In a preferred embodiment, the sealing structure is disposed between the lower part of the vertical side plate of the fan box and the smoke inlet hood, or the sealing structure is disposed between the bent portion and the smoke inlet hood, or the sealing structure is disposed between the flange and the smoke inlet hood.

[0019] In a preferred embodiment, mounting holes are provided at the relative positions of the smoke inlet hood wall and the fan box for connecting the hood wall to the fan box.

[0020] In a preferred embodiment, the smoke hood is connected to the inside of the fan box and is at least partially shielded by the fan box.

[0021] In a preferred embodiment, the dimensions of at least a portion of the fan housing that shields the smoke hood in the height direction are between 10 mm and 500 mm.

[0022] In a preferred embodiment, mounting holes are provided at the relative positions of the smoke inlet hood wall and the fan box for connecting the hood wall to the fan box.

[0023] In a preferred embodiment, the lower part of the fan box includes the lower part of the vertical side plate of the fan box, or an inwardly extending flange connected to the vertical side plate of the fan box, or a bent portion formed by first extending inward and then bending downward connected to the vertical side plate of the fan box, or a bent portion formed by extending inward and then bending upward connected to the vertical side plate of the fan box, or a bent portion formed by extending inward, then bending upward and then bending inward connected to the vertical side plate of the fan box.

[0024] In a preferred embodiment, the sealing structure is disposed between the lower part of the vertical side plate of the fan box and the smoke inlet hood, or the sealing structure is disposed between the bent portion and the smoke inlet hood, or the sealing structure is disposed between the flange and the smoke inlet hood.

[0025] In a preferred embodiment, the upper part of the fume hood has a first flange facing outward or inward, and the lower part of the fan box has a second flange facing outward or inward, wherein the first flange and the second flange are connected and sealed.

[0026] In a preferred embodiment, mounting holes are provided at the relative positions of the smoke inlet hood wall and the fan box for connecting the hood wall to the fan box, and the connection includes the positions of the mounting holes.

[0027] In a preferred embodiment, the front side panel of the fan box is asymmetrically provided with a plurality of first mounting holes, and the rear side panel of the fan box is asymmetrically provided with a plurality of second mounting holes. The plurality of first mounting holes coincide with the positions of the plurality of second mounting holes after rotating 180° around the vertical center line; and / or the left side panel of the fan box is asymmetrically provided with a plurality of third mounting holes, and the right side panel of the fan box is asymmetrically provided with a plurality of fourth mounting holes. The plurality of third mounting holes coincide with the plurality of fourth mounting holes after rotating 180° around the vertical center line.

[0028] In a preferred embodiment, the lower part of the smoke hood has a first adapter portion for connecting to a second adapter portion at the upper part of the smoke pipe.

[0029] In a preferred embodiment, an air inlet channel is formed inside the first transition portion and inside the portion of the smoke hood above the first transition portion, through which the flue gas in the smoke pipe can flow into the fan box.

[0030] In a preferred embodiment, the first adapter is inserted into the second adapter, and the outer surface of the first adapter is fixedly and sealed to the inner surface of the second adapter in a non-removable or detachable sealed connection; or, the second adapter is inserted into the first adapter, and the inner surface of the first adapter is fixedly and sealed to the outer surface of the second adapter in a non-removable or detachable sealed connection; or the first adapter and the second adapter are integrally formed.

[0031] In a preferred embodiment, the smoke hood further includes an enlargement located downstream of the first transition section along the direction of smoke flow.

[0032] In a preferred embodiment, the enlarged portion and the fan housing are connected at the connection point and are sealed to the lower part of the fan housing by a sealing structure.

[0033] In a preferred embodiment, the enlarged portion covers the outer side of the fan box, or the enlarged portion extends into the inner side of the fan box, or the upper end of the enlarged portion is connected to the lower end of the fan box, or the enlarged portion covers at least a portion of the fan.

[0034] In a preferred embodiment, a connecting portion is further provided between the enlarged portion and the first transition portion, the connecting portion including a platform portion or a gradually expanding portion.

[0035] In a preferred embodiment, the upper part of the first transition portion folds outward to form the platform portion, and the outer edge of the platform portion folds outward and extends upward to form the enlarged portion; or, the upper part of the first transition portion extends outward and upward to form the gradually expanding portion, and the outer edge of the gradually expanding portion folds outward and extends upward to form the enlarged portion.

[0036] In a preferred embodiment, the connection between the enlarged portion and the connecting portion has a chamfer, which is located below the air inlet of the fan casing.

[0037] In a preferred embodiment, the smoke hood is a plastic smoke hood or a metal smoke hood.

[0038] In a preferred embodiment, the fume hood has an oil-leaking structure for channeling oil from the gap between the fume hood and the fan box into the interior of the fume hood.

[0039] In a preferred embodiment, the fume hood at least partially shields at least part of the fan.

[0040] In a preferred embodiment, the smoke hood includes a front hood wall that covers at least a portion of the front side panel of the fan box and is sealed to the front side panel.

[0041] In a preferred embodiment, the smoke hood further includes a left hood wall and a right hood wall, the left hood wall covering at least a portion of the left side panel of the fan box and being sealed to the left side panel, and the right hood wall covering at least a portion of the right side panel of the fan box and being sealed to the right side panel.

[0042] In a preferred embodiment, the smoke hood further includes a rear cover wall that covers at least a portion of the rear side panel of the fan box and is sealed to the rear side panel.

[0043] In a preferred 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 and the vertical wall is greater than or equal to 45° and less than 90°.

[0044] In a preferred embodiment, the smoke hood covers at least a portion of the area of ​​the fan located below the air inlet of the volute.

[0045] In a preferred embodiment, the highest position of the projection of the smoke hood toward the volute of the fan is close to or located at the lower edge of the air inlet of the volute.

[0046] In a preferred embodiment, the smoke hood covers at least a portion of the air inlet of the fan's volute.

[0047] In a preferred embodiment, the overlapping area of ​​the projection of the smoke hood toward the air inlet of the fan casing and the air inlet of the fan casing is greater than, equal to or less than 1 / 2 of the area of ​​the air inlet of the fan casing.

[0048] In a preferred embodiment, the centerline of the impeller of the fan is parallel to the wall surface, or the angle between the centerline of the impeller of the fan and the wall surface is greater than 0° and less than 45°.

[0049] In a preferred embodiment, the projection of the smoke hood toward the volute of the fan is at least above the air inlet of the volute of the fan.

[0050] In a preferred embodiment, the projection of the smoke hood toward the volute of the fan coincides at least with the impeller of the fan.

[0051] In a preferred embodiment, the lower part of the volute of the fan protrudes from the fan housing in the height direction.

[0052] In a preferred embodiment, the height difference between the lowest position of the lower part of the volute and the lowest position of the fan box is between 15 mm and / or 220 mm.

[0053] In a preferred embodiment, the height difference between the lowest position of the lower part of the volute and the lowest position of the fan box is 4% or more and / or 60% or less than the total height of the volute.

[0054] In a preferred embodiment, the height of any one of the front side panel, rear side panel, left side panel, and right side panel of the fan box is no greater than 385 mm.

[0055] In a preferred embodiment, the lowest position of the fan housing is located above, close to or flush with, the lowest position of the air inlet of the fan casing in the height direction, or below the lowest position of the air inlet of the fan casing.

[0056] In a preferred embodiment, the lowest position of the fan box is close to, flush with, or below the lowest position of the air inlet of the fan casing in the height direction. A noise reduction structure is also provided on the inner surface of the fan box, and the noise reduction structure is arranged opposite to the air inlet of the fan casing.

[0057] In a preferred embodiment, the noise reduction structure includes: a noise reduction layer and a fixing mechanism for fixing the noise reduction layer to the inner surface of the fan housing.

[0058] In a preferred embodiment, the surface of the fixing mechanism has a non-microporous perforated structure.

[0059] In a preferred embodiment, in the height direction, the bottom of the fan housing is lower than the bottom of the fan volute, or the bottom of the fan housing is flush with the bottom of the fan volute.

[0060] In a preferred embodiment, the range hood further includes a smoke outlet seat for installation above the ceiling; the fan housing includes a first side plate and a second side plate disposed opposite to each other, the upper part of the first side plate having a fan housing outlet; the mounting part of the smoke outlet seat is located on the inner side of the upper part of the first side plate or the mounting part of the smoke outlet seat is located on the outer side of the upper part of the first side plate; the smoke outlet of the fan casing is connected to the smoke outlet seat; the upper part of the first side plate is inclined from bottom to top toward the second side plate, and the upper part of the first side plate and the lower part of the first side plate have a non-zero included angle.

[0061] In a preferred embodiment, the fan box is mounted on or near the top wall.

[0062] In a preferred embodiment, the height difference between the top of the fan box and the top wall is no more than 90 mm.

[0063] In a preferred embodiment, the smoke outlet extends downwards in a direction away from the fan box, or extends horizontally in a direction away from the fan box, or extends upwards in a direction away from the fan box with its highest point not higher than the top of the fan box, or extends upwards in a direction away from the fan box with the height difference between its highest point and the top of the fan box not greater than the height difference between the top wall and the top of the fan box.

[0064] In a preferred embodiment, the smoke outlet seat extends horizontally in a direction away from the fan box, and has a smoke inlet end and a smoke outlet end. The smoke outlet end is generally vertically or inclined, and the smoke inlet end is inclined from bottom to top in a direction away from the smoke outlet end.

[0065] In a preferred embodiment, the smoke outlet seat extends upward at an overall angle in a direction away from the fan box. The smoke outlet seat has a smoke inlet end and a smoke outlet end. The smoke outlet end is generally arranged vertically or at an angle, and the smoke inlet end is arranged at an angle from bottom to top in a direction away from the smoke outlet end.

[0066] In a preferred embodiment, the smoke outlet seat extends downward in a direction away from the fan box, and the smoke outlet seat has a smoke inlet end and a smoke outlet end. The smoke outlet end is generally vertically or inclined, and the smoke inlet end is inclined from bottom to top in a direction away from the smoke outlet end.

[0067] In a preferred embodiment, the plane where the smoke outlet mounting portion is located is parallel to the plane where the fan box outlet is located on the upper part of the first side plate.

[0068] In a preferred embodiment, the plane containing the upper part of the first side plate makes an angle of less than 14.9° with the vertical direction, or greater than 15.1° and less than or equal to 75°, or equal to 15°.

[0069] In a preferred embodiment, the length of the upper part of the first side plate is greater than or equal to a preset ratio of the total length of the first side plate, and the preset ratio is not less than 40% to 90%.

[0070] In a preferred embodiment, the upper part of the first side plate has a vertical height of less than or equal to 300 mm.

[0071] In a preferred embodiment, the range hood further includes a decorative cover, the maximum cross-section of which is projected downwards into the outlet of the lower cavity, so that the decorative cover can cover the air outlet of the lower cavity and the smoke inlet hood.

[0072] In a preferred embodiment, the fan box has a fan box inlet for introducing flue gas, the centerline of which is perpendicular to the axis of the fan impeller.

[0073] In a preferred embodiment, the fan housing has a first dimension in the left-right direction between 100 mm and 450 mm, and a second dimension in the front-back direction between 100 mm and 450 mm.

[0074] The technical solution of this utility model has the following significant beneficial effects:

[0075] This application provides a range hood, which includes a fan box, a smoke inlet hood, a smoke pipe, and a lower cavity. The lower cavity, smoke pipe, smoke inlet hood, and fan box are sequentially arranged along the direction of smoke flow. The smoke inlet hood is connected to the fan box at a connection point, and the lower part of the smoke inlet hood and the fan box are sealed together by a sealing structure. When the smoke inlet hood and the lower part of the fan box are sealed together by the sealing structure, the provided range hood can produce at least one of the following technical effects:

[0076] First, the sealing mechanism can be used to fill the gap between the smoke inlet hood and the fan box, thereby preventing noise from being generated between the smoke inlet hood and the fan box when the fan is working, thus optimizing the noise reduction performance of the range hood.

[0077] Second, it facilitates the insertion, assembly, and disassembly of the fan box and the fume hood. During the insertion and assembly process, the sealing structure is less likely to be touched, thus preventing displacement of the sealing structure. This not only ensures a good seal but also improves the ease of assembly and disassembly. If the sealing structure is frequently squeezed during the insertion, assembly, or disassembly of the fan box and the fume hood, misalignment of the sealing structure can easily occur, making assembly and disassembly difficult and affecting the sealing effect.

[0078] Third, the sealing structure can be reliably constrained, thus ensuring a better oil leakage prevention effect. If the sealing structure is placed in the gap between the fume hood and the fan box, the seal at the above location is easily affected by assembly, installation process, and operating conditions, and gaps are easily formed between the sealing structure and the fume hood and / or fan box, resulting in a higher risk of oil leakage.

[0079] Fourth, the sealing structure can provide better support and fixation for the connection between the smoke hood and the fan box, enhance the stability of the entire structure, and reduce the loosening or displacement of components caused by vibration and other factors during operation.

[0080] Fifth, it can better guide airflow into the fan box, making the air intake smoother, reducing airflow turbulence and eddy currents, thereby improving air intake efficiency and enhancing the overall performance and working efficiency of the fan. Taking the case where the smoke inlet hood is located outside the fan box as an example, specifically at the lower end of the fan box, this means that the sealing structure is located at the upstream end of the gap between the smoke inlet hood and the fan box in the direction of the flue gas flow. The flue gas will not enter the narrow gap between the smoke inlet hood and the fan box. Even if the sealing structure fails due to aging or other reasons, its guiding effect on the flue gas still exists, meaning that the fan can still have a better air intake efficiency.

[0081] 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

[0082] 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.

[0083] Figure 1 This is a schematic diagram of the structure of a range hood provided in the embodiments of this application;

[0084] Figure 2 This is an exploded view of a range hood provided in the embodiments of this application;

[0085] Figure 3 This is a front view of the fan box and smoke inlet hood in an embodiment of this application.

[0086] Figure 4 This is a side view of the fan box and smoke inlet hood in an embodiment of this application.

[0087] Figure 5 This is a cross-sectional view of the fan box and smoke inlet hood in an embodiment of this application.

[0088] Figure 6 for Figure 5 A partially enlarged schematic diagram of the sealing fit between the central stroke unit casing and the smoke inlet hood;

[0089] Figure 7 This is a schematic diagram of the structure of the fan housing in a range hood provided in the embodiments of this application;

[0090] Figure 8 This is a schematic diagram of the structure of a smoke inlet hood in an embodiment of this application;

[0091] Figure 9 This is a top view of a smoke inlet hood in an embodiment of this application;

[0092] Figure 10 This is a simplified structural diagram of the first type of fan box in a range hood provided in the embodiments of this application;

[0093] Figure 11 This is a simplified structural diagram of a second type of fan box in a range hood provided in the embodiments of this application;

[0094] Figure 12 This is a simplified structural diagram of a third type of fan box in a range hood provided in the embodiments of this application;

[0095] Figure 13 This is a simplified structural diagram of a fourth type of fan box in a range hood provided in the embodiments of this application;

[0096] Figure 14 This is a simplified structural diagram of a fifth type of fan box in a range hood provided in the embodiments of this application;

[0097] Figure 15 This is a simplified structural diagram of the sixth type of fan box in a range hood provided in the embodiments of this application;

[0098] Figure 16 This is a simplified structural diagram of the connection between the fan box and the smoke inlet hood in an embodiment of this application;

[0099] Figure 17 This is a simplified structural diagram of the connection between the fan box and the smoke inlet hood in another range hood provided in the embodiments of this application;

[0100] Figure 18 This is a schematic diagram illustrating the connection between the smoke inlet hood and the smoke pipe in an embodiment of this application;

[0101] Figure 19 This is a cross-sectional view of the connection between the smoke inlet hood and the smoke pipe in a range hood provided in the embodiments of this application;

[0102] Figure 20 This is a schematic diagram of the internal structure of the fan box in a range hood provided in the embodiments of this application;

[0103] Figure 21 This is a right view of the fan housing of a range hood provided in the embodiments of this application.

[0104] Reference numerals in the figures of this application:

[0105] 1. Fan box;

[0106] 101. The lower part of the fan box;

[0107] 102. Air vent;

[0108] 103. Fan box inlet;

[0109] 11. Snail shell;

[0110] 111. Air inlet;

[0111] 12. Mounting holes;

[0112] 131. Front side panel;

[0113] 132. Rear side panel;

[0114] 133. Left side panel;

[0115] 134. Right side panel;

[0116] 135. Top slab;

[0117] 14. Socket;

[0118] 102. Second flanging;

[0119] 601, Third mounting hole;

[0120] 602, Fourth mounting hole;

[0121] 65. Fixed mechanism;

[0122] 2. Smoke hood;

[0123] 20. Connecting part;

[0124] 21. First transfer section;

[0125] 22. Enlarged section;

[0126] 23. Chamfer;

[0127] 25. Plug;

[0128] 26. Groove;

[0129] 27. Oil-leaking structure;

[0130] 28. Flanged edge;

[0131] 29. Sealed structure;

[0132] 103. First flanging;

[0133] 201. Front cover wall;

[0134] 202. Rear cover wall;

[0135] 203. Left side wall;

[0136] 204. Right side wall;

[0137] 3. Smoke pipe;

[0138] 31. Second adapter section;

[0139] 4. Lower cavity;

[0140] 5. Smoke outlet;

[0141] 6. Suspended ceiling;

[0142] 65. Fixed mechanism;

[0143] 7. Ceiling and walls;

[0144] 8. Decorative cover;

[0145] X, left and right directions;

[0146] Y, forward / backward direction;

[0147] Z, altitude direction. Detailed Implementation

[0148] 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.

[0149] 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.

[0150] 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.

[0151] The inventors of this application discovered that the joint between the upper part of the connecting pipe and the exhaust module generates airflow when the exhaust module (fan) is working, which causes a whistling sound and is not conducive to ensuring the noise reduction performance of the split range hood.

[0152] This utility model provides a range hood that can further improve the performance of split-type range hoods, such as noise reduction, oil leakage prevention, or installation compatibility.

[0153] Please refer to the following for comprehensive information. Figures 1 to 21 This application specification provides a range hood, which may include: a fan box 1, a smoke inlet hood 2, a smoke pipe 3, and a lower cavity 4, wherein the fan box 1, the smoke inlet hood 2, the smoke pipe 3, and the lower cavity 4 are connected sequentially from top to bottom; the fan box 1 contains a fan, which is at least partially installed above the ceiling 6; the smoke inlet hood 2 is connected to the fan box 1 at a connection point; and the smoke inlet hood 2 and the lower part 101 of the fan box are sealed and adapted to each other by a sealing structure 29.

[0154] In this embodiment, the range hood may include a fan housing 1, a smoke inlet hood 2, a smoke pipe 3, and a lower cavity 4. The lower cavity 4, smoke pipe 3, smoke inlet hood 2, and fan housing 1 can be arranged sequentially along the direction of smoke flow. Specifically, the lower cavity 4, smoke pipe 3, smoke inlet hood 2, and fan housing 1 can be arranged vertically against a wall from bottom to top. The lower cavity 4 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.

[0155] In a typical kitchen environment, a suspended ceiling 6 is installed above the kitchen space. The range hood in this application embodiment is mainly illustrated using a kitchen environment with a suspended ceiling 6 as an example. Of course, the fan of the range hood protected in this application embodiment can also be used in scenarios where a suspended ceiling 6 is not installed. Therefore, it should be noted that under the actual working conditions after the range hood is installed, regardless of whether the fan is installed above the suspended ceiling, it is within the scope of protection of this application.

[0156] In this embodiment, the fan housing 1 contains a fan, which is at least partially positioned above the ceiling 6. For a range hood, the fan in the fan housing 1 is the primary source of noise. Positioning the fan at least partially above the ceiling 6, away from the user, helps reduce the noise generated during operation. Furthermore, with the fan positioned further away from the user, the distance to the stove where the fumes are generated is also relatively greater, effectively reducing the amount of grease adsorbed on the fan impeller and volute 11. This prevents grease buildup on the fan, ensuring reliable operation and extending its lifespan.

[0157] The smoke inlet hood 2 is sealed to the fan housing 1. Specifically, the relative positional relationship between the smoke inlet hood 2 and the fan housing 1 can be: the upper part of the smoke inlet hood 2 can cover the outer side of the fan housing 1, or the upper part of the smoke inlet hood 2 can extend into the inner side of the fan housing 1, or the upper end of the smoke inlet hood 2 is connected to the lower end of the fan housing 1. In the embodiments and drawings of this application, the embodiment in which the upper part of the smoke inlet hood 2 covers the outer side of the fan housing 1 is mainly described in detail. Other embodiments can refer to this typical embodiment, and will not be described in detail here.

[0158] A connection is formed between the smoke inlet hood 2 and the fan housing 1, and the two are connected at the connection to ensure that the positions of the smoke inlet hood 2 and the fan housing 1 are relatively fixed. In addition, the smoke inlet hood 2 and the lower part 101 of the fan housing are sealed and adapted to each other by a sealing structure 29. The lower part 101 of the fan housing can be the part below the middle of the fan housing 1, and the lower part 101 of the fan housing can be including but not limited to the lower end of the fan housing 1.

[0159] When the range hood provided in this application embodiment is sealed to the lower part 101 of the fan box through the sealing structure 29, it can produce at least one of the following technical effects:

[0160] First, the sealing mechanism can be used to fill the gap between the smoke inlet hood 2 and the fan box 1, thereby preventing noise from being generated between the smoke inlet hood 2 and the fan box 1 when the fan is working, thus optimizing the noise reduction performance of the range hood.

[0161] Second, it facilitates the insertion, assembly, and disassembly of the fan housing 1 and the smoke inlet hood 2. During the insertion and assembly of the smoke inlet hood 2 and the fan housing 1, the sealing structure 29 is less likely to be touched, thus preventing displacement of the sealing structure 29. This not only ensures a good seal but also improves the ease of assembly and disassembly. If the sealing structure 29 is frequently squeezed during the insertion, assembly, or disassembly of the fan housing 1 and the smoke inlet hood 2, it is easy to cause misalignment of the sealing structure 29, making assembly and disassembly difficult and affecting the sealing effect.

[0162] Third, the sealing structure 29 can be reliably constrained, which helps to ensure that the sealing structure 29 has a better oil leakage prevention effect. If the sealing structure 29 is placed in the gap formed between the smoke inlet hood 2 and the fan box 1, the seal at the above position is easily affected by assembly, installation process and operating conditions, and gaps are easily formed between the sealing structure 29 and the smoke inlet hood 2 and / or the fan box 1, resulting in a higher risk of oil leakage.

[0163] IV. The sealing structure 29 can provide better support and fixation for the connection between the smoke hood 2 and the fan box 1, enhance the stability of the entire structure, and reduce the loosening or displacement of components caused by vibration and other factors during operation.

[0164] Fifth, it can better guide airflow into the fan housing 1, making the air intake smoother, reducing airflow turbulence and eddy currents, thereby improving air intake efficiency and enhancing the overall performance and working efficiency of the fan. Taking the case where the smoke hood 2 is installed outside the fan housing 1 as an example, specifically at the lower end of the fan housing 1, the sealing structure 29 is located at the upstream end of the gap between the smoke hood 2 and the fan housing 1 in the direction of flue gas flow. The flue gas will not enter the narrow gap between the smoke hood 2 and the fan housing 1. Even if the sealing structure 29 fails due to aging or other reasons, its guiding effect on the flue gas will still exist, that is, the fan can still have better air intake efficiency.

[0165] When the lower part 101 of the fan box is the lower end of the fan box 1, more of the aforementioned effects can be achieved; of course, provided that one of the aforementioned effects can be achieved, the scope of protection of this application does not exclude the situation where the smoke hood 2 is sealed with other positions of the fan box 1, including but not limited to the lower part and the upper part.

[0166] When the fan is at least partially located above the suspended ceiling 6, the problems of oil leakage and maintenance will become more prominent, and the effect of the embodiment of this application will be more prominent.

[0167] The present application will now be described in detail with reference to the accompanying drawings and embodiments.

[0168] Please refer to the following: Figure 3 , Figure 4 and Figure 5 In some embodiments, the connection is higher than the sealing structure 29 in the height direction Z.

[0169] In this embodiment, the connection point can be higher than the sealing structure 29. When the connection point is higher than the sealing structure 29, that is, when the sealing structure 29 is located below the connection point, the oil condensed on the inner wall of the fan housing 1 will not come into contact with the connection structure at the connection point under the action of the sealing structure 29, thereby preventing the oil from seeping out from the inside at the connection point. In addition, when the connection point is higher than the sealing structure 29, when the connection structure at the connection point is used to connect and fix the smoke hood 2 and the fan housing 1, which are located below it and have the sealing structure 29 installed, the sealing structure 29 can also be firmly constrained between the smoke hood 2 and the lower part 101 of the fan housing.

[0170] Specifically, the connection structure can be a threaded fastening structure, such as a screw. Of course, the connection structure is not limited to the example above; in this application, a screw is used as an example for illustration.

[0171] like Figure 3 or Figure 4 As shown, in one embodiment, mounting holes 12 are provided at opposite positions on the wall of the smoke inlet hood 2 and the fan box 1 for connecting the wall of the hood to the fan box 1. The connection includes the positions of the mounting holes 12.

[0172] In this embodiment, both the wall of the fume hood 2 and the lower part 101 of the fan box are provided with corresponding mounting holes 12. The specific form of the mounting hole 12 can vary depending on the connection structure, and this application does not impose a specific limitation here. For example, when the connection structure is a screw, the mounting hole 12 is a screw hole for installing the screw. Accordingly, the connection includes the location where the mounting hole 12 is provided, which has a certain height distance in the height direction Z, at least satisfying the installation requirements of the mounting hole 12 and the connection structure.

[0173] Please refer to the following: Figure 7 and Figure 9 In one embodiment, the front side plate 131 of the fan box 1 is asymmetrically provided with a plurality of first mounting holes, and the rear side plate 132 of the fan box 1 is asymmetrically provided with a plurality of second mounting holes. The plurality of first mounting holes are rotated 180° around the vertical center line and coincide with the position of the plurality of second mounting holes. The first mounting holes and the second mounting holes are used to connect the smoke inlet hood 2. And / or the left side plate 133 of the fan box 1 is asymmetrically provided with a plurality of third mounting holes 601, and the right side plate 134 of the fan box 1 is asymmetrically provided with a plurality of fourth mounting holes 602. The plurality of third mounting holes 601 are rotated 180° around the vertical center line and coincide with the plurality of fourth mounting holes 602. The third mounting holes 601 and the fourth mounting holes 602 are used to connect the smoke inlet hood 2.

[0174] In this embodiment, the fan housing 1 has opposing front side plates 131 and rear side plates 132, as well as opposing left side plates 133 and right side plates 134. Taking the left side plates 133 and 134 of the fan housing 1 as an example, if the left side plate 133 of the fan housing 1 is rotated 180° around the vertical center line of the fan housing 1, the third mounting hole 601 on the left side plate 133 can coincide with the fourth mounting hole 602 on the right side plate 134. With this configuration, when the smoke hood 2 is docked with the fan housing 1, the left wall 203 and right wall 204 of the smoke hood 2 and the left side plates 133 and 134 of the fan housing 1 can be interchanged. During installation, installers do not need to deliberately align the left side panel 133 and right side panel 134 of the fan box 1 with the left and right walls of the smoke hood 2. The left side panel 133 of the fan box 1 can correspond to the left wall 203 or the right wall 204 of the smoke hood 2. This arrangement reduces the requirements and difficulty of assembling the fan box 1 and the smoke hood 2, improves assembly efficiency, and uses the asymmetrical openings to prevent mistakes. In addition, the asymmetrical openings themselves are simple to manufacture and have relatively low requirements for the spacing between openings.

[0175] Please refer to the following: Figures 3 to 5 In some embodiments, the smoke hood 2 is connected to the outside of the fan box 1 and shields at least part of the fan box 1.

[0176] In this embodiment, the smoke hood 2 can be connected to the outside of the fan box 1, thereby at least partially shielding the fan box 1. The two overlap in the height direction Z, which is equivalent to adding a barrier structure to the noise propagation path relative to the original standalone fan box 1, which helps to prevent noise from propagating outward and further improves the noise reduction performance of the range hood.

[0177] like Figure 5 As shown, specifically, the dimension H1 of at least part of the shielded fan box 1 in the height direction Z is 10 mm to 500 mm.

[0178] In this embodiment, the dimension H1 of at least a portion of the shielded fan housing 1 in the height direction Z is more than 10 mm, so that the smoke inlet hood 2 and the fan housing 1 have an overlap of more than 10 mm in the height direction Z, which can form two layers of protection at a certain height in the noise propagation path, thereby achieving a better noise reduction effect. In addition, the overlap of more than 10 mm between the smoke inlet hood 2 and the fan housing 1 in the height direction Z, the gap between the two is equivalent to extending the flow channel for oil overflow, so even when the seals age, the oil condensed inside and above the fan housing 1 is not easy to overflow from between the two.

[0179] At least a portion of the shielded fan housing 1 has a height dimension (Z) of less than 500 mm, primarily because this dimension is less than or equal to the height of the fan housing 1 itself. Theoretically, the closer the height of the shielded fan housing 1 is to the height of the fan housing 1 itself, the better the noise reduction effect. Generally, the height dimension of the shielded fan housing 1 can be smaller than the height of the fan housing 1 itself, thus balancing the manufacturing cost of the range hood and keeping it within a reasonable range. Furthermore, when the material of the smoke inlet hood 2 is a material with relatively low hardness (e.g., plastic), the stability of the smoke inlet hood 2 structure can also be ensured.

[0180] The boundary values ​​described above in this application embodiment can be adapted to the dimensions of the fan box 1 and the fan volute 11 in conventional range hoods.

[0181] To ensure that the fan housing 1 can be installed in a typical household cabinet, the fan housing 1 has a first dimension along the left-right direction (X) between 100 mm and 450 mm, and a second dimension along the front-back direction (Y) between 100 mm and 450 mm. Taking vertical installation as an example, when the air inlet 111 of the fan housing 11 is arranged facing the front and back sides, the first dimension can be a relative length dimension, and the second dimension can be a relative width dimension. Generally, based on the structure of the housing 11, the length dimension is greater than the width dimension. When the air inlet 111 of the fan housing 11 is arranged facing the left-right direction, the first dimension can be a relative width dimension, and the second dimension can be a relative length dimension. In the embodiments and drawings of this application, the example of the air inlet 111 of the fan housing 11 being arranged facing the front and back sides is mainly used for illustration.

[0182] Furthermore, when the outer contour dimension of the fan box 1 increases, the dimension of the at least part of the fan box 1 that is obscured in the height direction Z can also be appropriately increased; when the outer contour dimension of the fan box 1 decreases, the dimension of the at least part of the fan box 1 that is obscured in the height direction Z can also be appropriately decreased or kept unchanged.

[0183] Of course, while achieving the basic effect, this application also does not exclude the possibility that the minimum dimension of the at least part of the obscured fan box 1 in the height direction Z is slightly less than 10 mm. The dimension of the at least part of the obscured fan box 1 in the height direction Z can be 9 mm, 8 mm, etc. When the dimension of the at least part of the obscured fan box 1 in the height direction Z is slightly less than 10 mm, it can still achieve essentially the same effect as the minimum boundary value of 0 mm. When the dimension of the at least part of the obscured fan box 1 in the height direction Z is too small, for example, less than 1 mm, it may not meet the requirement of setting up a connection mechanism between the fan box 1 and the smoke inlet hood 2.

[0184] Please refer to the following: Figure 6 In one embodiment, the wall of the smoke inlet hood 2 is bent inward to form a flange 28, or the inner surface of the wall of the smoke inlet hood 2 is provided with a flange 28. The flange 28 is used to limit the lower part 101 of the fan box. The sealing structure 29 is provided between the flange 28 and / or the wall and the lower part 101 of the fan box.

[0185] In this embodiment, a flange 28 is provided on the inner side of the smoke hood 2 by means of integral molding or fixed installation. The flange 28 can be used to directly or indirectly limit the lower part 101 of the fan box; in addition, the flange 28 can also be used to cooperate with the sealing structure 29.

[0186] Specifically, the sealing structure 29 can be disposed between the flanged portion 28 and the lower part 101 of the fan box, or the sealing structure 29 can be disposed between the flanged portion 28, the wall of the smoke inlet hood 2, and the lower part 101 of the fan box, or the sealing structure 29 can be disposed between the wall of the smoke inlet hood 2 and the lower part 101 of the fan box. Taking the sealing structure 29 disposed between the flanged portion 28, the wall of the smoke inlet hood 2, and the lower part 101 of the fan box as an example, the upper surface of the sealing structure 29 can contact the lower part 101 of the fan box, the outer surface of the sealing structure 29 can contact the wall of the smoke inlet hood 2, and the lower surface of the sealing structure 29 can contact the flanged portion 28.

[0187] Furthermore, in this embodiment, the lower part 101 of the fan box and the flanged part 28 of the smoke inlet hood 2 can also be fitted together to form a plug-in mechanism. When the fan box 1 and the smoke inlet hood 2 are fitted together, the plug-in structure can ensure that the lower part 101 of the fan box reliably abuts against the sealing structure 29.

[0188] Specifically, the plug-in structure can be in the form of a plug 25 mating with a socket 14.

[0189] For example, the flanged part 28 is provided with a socket 14, and the lower part 101 of the fan box is provided with a plug 25; or, the flanged part 28 is provided with a plug 25, and the lower part 101 of the fan box is provided with a socket 14.

[0190] Please refer to the following: Figures 7 to 8 In one specific embodiment, a plug 25 is provided on the flange 28, and the lower part 101 of the fan box includes a flange extending into the fan box 1, and a socket 14 is provided on the flange.

[0191] In this embodiment, a plug 25 is provided on the flanged portion 28. The lower part 101 of the fan housing may be provided with a flange extending into the interior of the fan housing 1. The flange may be provided with a plurality of sockets 14 that match the plug 25. The outline dimension of the sockets 14 may be slightly larger than the cross-sectional dimension of the plug 25, thereby facilitating the efficient insertion of the plug 25 into the sockets 14. Furthermore, in order to ensure that the plug 25 is accurately and efficiently inserted into the sockets 14, guide angles may be provided on one or both sides of the end of the plug 25.

[0192] Please refer to the following: Figures 8 to 9 In one embodiment, the wall of the smoke inlet hood 2 is bent inward to form a groove 26, or the inner surface of the wall of the smoke inlet hood 2 is provided with a groove 26. The groove 26 is used to limit the lower part 101 of the fan box. The sealing structure 29 is provided between the groove 26 and / or the wall and the lower part 101 of the fan box.

[0193] In this embodiment, a groove 26 is provided on the inner side of the smoke inlet hood 2, either by integral molding or by fixed installation. The groove 26 can be used to directly or indirectly limit the lower part 101 of the fan box; in addition, the groove 26 can also be used to cooperate in setting the sealing structure 29.

[0194] Specifically, the sealing structure 29 can be disposed between the groove 26 and the lower part 101 of the fan box, or the sealing structure 29 can be disposed between the groove 26, the cover wall, and the lower part 101 of the fan box, or the sealing structure 29 can be disposed between the cover wall and the lower part 101 of the fan box. Taking the sealing structure 29 disposed between the groove 26 and the lower part 101 of the fan box as an example, the upper surface of the sealing structure 29 can contact the lower part 101 of the fan box, and the side and lower surfaces of the sealing structure 29 can contact the groove 26.

[0195] Furthermore, the groove 26 has an oil leakage structure 27, which is used to guide the oil in the gap between the groove 26 and the fan box 1 into the interior of the fume hood 2.

[0196] In this embodiment, the groove 26 has a bottom, an inner groove wall located inside the bottom, and an outer groove wall located outside the bottom. The outer groove wall is the cover wall of the smoke inlet hood 2. An oil leakage structure 27 may be provided on the inner groove wall. Specifically, the oil leakage structure 27 may be at least one slot or opening provided on the inner groove wall.

[0197] When a gap forms between the inner wall of the fume hood 2 and the fan housing 1, the oil condensed on the inner wall of the fan housing 1 flows to the sealing structure 29 and then into the gap between the inner wall of the groove 26 and the fan housing 1. Because the inner wall has a certain height, the oil accumulates in this gap. Prolonged contact between the accumulated oil and the sealing structure 29 not only affects its sealing performance but also makes it prone to leakage during disassembly. Furthermore, it increases the difficulty of cleaning this structure.

[0198] In this embodiment, by setting an oil leakage structure 27 on the inner wall of the groove 26, the oil can be efficiently and quickly discharged downwards, thereby preventing the oil from accumulating in the gap between the groove 26 and the fan box 1. This also allows the sealing structure 29 to be sealed from long-term immersion in oil, and prevents oil leakage during disassembly. Furthermore, it does not increase the difficulty of cleaning this structure.

[0199] In some embodiments, the lower part 101 of the fan box includes the lower part of the vertical side plate of the fan box 1, or an inwardly extending or outwardly extending flange connected to the vertical side plate of the fan box 1, or a bent portion formed by first extending inward and then bending downward connected to the vertical side plate of the fan box 1.

[0200] In this embodiment, the specific structure of the lower part 101 of the fan box can include a variety of different structural forms.

[0201] like Figure 10 As shown, the fan housing 1 has a vertical side plate. The lower part 101 of the fan housing can be the lower part of the vertical side plate. For example, it can be located below the middle of the vertical side plate or at the lower end of the vertical side plate.

[0202] When the lower part 101 of the fan box is the lower part of the vertical side plate, the sealing structure 29 is disposed between the lower part of the vertical side plate of the fan box 1 and the smoke inlet hood 2.

[0203] like Figure 11 or Figure 12 As shown, the fan housing 1 has a vertical side plate and a flange connected to the vertical side plate. Specifically, the lower part 101 of the fan housing can be the flange connected to the vertical side plate. This flange can extend inward or outward from the lower end of the vertical side plate. Of course, the specific construction of the flange is not limited to the example above. 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 substantially the same as or similar to those of this application, they should all be covered within the scope of protection of this application.

[0204] When the lower part 101 of the fan box is a flange connected to the vertical side plate, the sealing structure 29 is disposed between the flange and the smoke inlet hood 2.

[0205] like Figure 13 As shown, the fan housing 1 has a vertical side plate and a bent portion connected to the vertical side plate. Specifically, the lower part 101 of the fan housing can be the bent portion connected to the vertical side plate. This bent portion can be formed by extending inward from the lower end of the vertical side plate and then bending downward. Of course, the specific structure of the bent portion is not limited to the example above. Those skilled in the art may make other modifications based on the technical essence of this application, but as long as the achieved function and effect are substantially the same as or similar to that of this application, they should be covered within the scope of protection of this application.

[0206] When the lower part 101 of the fan box is a bent part connected to the vertical side plate of the fan box 1, the sealing structure 29 is disposed between the bent part and the smoke inlet hood 2.

[0207] In other embodiments, the smoke hood 2 is connected to the inside of the fan box 1 and is at least partially shielded by the fan box 1.

[0208] In this embodiment, when the smoke inlet hood 2 is connected to the inner side of the fan housing 1, the smoke inlet hood 2 is at least partially blocked by the fan housing 1, and the two form an overlapping portion in the height direction Z. The technical effect of forming the overlapping portion can be referred to the embodiment described above where the smoke inlet hood 2 is connected to the outer side of the fan housing 1, and will not be repeated here.

[0209] Furthermore, the dimensions of at least a portion of the fan box 1 that obstructs the smoke inlet hood 2 in the height direction Z are 10 mm to 500 mm.

[0210] The reason for selecting the size range of the fan box 1 of the smoke inlet hood 2 in the height direction Z can also refer to the above-described embodiment where the smoke inlet hood 2 is connected to the outside of the fan box 1, and will not be repeated here.

[0211] Please refer to the following: Figures 10 to 15 The lower part 101 of the fan box includes the lower part of the vertical side plate of the fan box 1, or an inwardly extending flange connected to the vertical side plate of the fan box 1, or a bent part connected to the vertical side plate of the fan box 1 that first extends inward and then bends downward, or a bent part connected to the vertical side plate of the fan box 1 that extends inward and then bends upward, or a bent part connected to the vertical side plate of the fan box 1 that extends inward, then bends upward and then bends inward.

[0212] In this embodiment, the specific structure of the lower part 101 of the fan box can include a variety of different structural forms.

[0213] like Figure 10 As shown, the fan housing 1 has a vertical side plate. The lower part 101 of the fan housing can be the lower part of the vertical side plate. For example, it can be located below the middle of the vertical side plate or at the lower end of the vertical side plate.

[0214] When the lower part 101 of the fan box is the lower part of the vertical side plate, the sealing structure 29 is disposed between the lower part of the vertical side plate of the fan box 1 and the smoke inlet hood 2.

[0215] like Figure 11 or Figure 12 As shown, the fan housing 1 has a vertical side plate and a flange connected to the vertical side plate. Specifically, the lower part 101 of the fan housing can be the flange connected to the vertical side plate.

[0216] The flange can be formed by extending inward from the vertical side plate. Of course, the specific structure of the flange is not limited to the example above. Those skilled in the art may make other changes based on the technical essence of this application, but as long as the function and effect achieved are the same as or similar to this application, they should be covered within the scope of protection of this application.

[0217] When the lower part 101 of the fan box is a flange connected to the vertical side plate, the sealing structure 29 is disposed between the flange and the smoke inlet hood 2.

[0218] like Figure 13 , Figure 14 and Figure 15 As shown, the fan housing 1 has a vertical side plate and a bent portion connected to the vertical side plate. Specifically, the lower part 101 of the fan housing can be the bent portion connected to the vertical side plate. This bent portion can be formed by extending inward from the lower end of the vertical side plate and then bending downward; alternatively, it can be formed by extending inward from the lower end of the vertical side plate and then bending upward; or it can be formed by extending inward from the lower end of the vertical side plate of the fan housing 1, then bending upward, and then bending inward again. Of course, the specific structure of the bent portion is 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 function and effect achieved are substantially the same as or similar to that of this application, they should all be covered within the scope of protection of this application.

[0219] When the lower part 101 of the fan box is a bent part connected to the vertical side plate of the fan box 1, the sealing structure 29 is disposed between the bent part and the smoke inlet hood 2.

[0220] like Figures 16 to 17 As shown, in one embodiment, the upper part of the smoke hood 2 has a first flange 103 facing outward or inward, and the lower part 101 of the fan box has a second flange 102 facing outward or inward. The first flange 103 and the second flange 102 are connected and sealed.

[0221] In this embodiment, the upper end of the fume hood 2 and the end of the fan housing 1 can be connected by a butt joint. Specifically, a flange can be provided at the butt joint position of the fume hood 2 and the fan housing 1, and the connection and sealing can be achieved at the flange position. For example, the upper part of the fume hood 2 has a first flange 103 facing outward or inward, and the lower part 101 of the fan housing has a second flange 102 facing outward or inward. The first flange 103 and the second flange 102 are arranged opposite to each other, and a connector and a sealing member can be provided at the mating position of the first flange 103 and the second flange 102 to achieve a sealed connection.

[0222] In the embodiments of this application, the fume hood 2 is a transition piece that connects the fume pipe 3 to the fume hood 2. The lower part of the fume hood 2 and the upper part of the fume pipe 3 can be integrally formed or sealed together.

[0223] like Figure 18 and Figure 19 As shown, in some embodiments, the lower part of the smoke hood 2 has a first adapter 21, which is used to connect to the upper part of the second adapter 31 of the smoke pipe 3.

[0224] The interior of the first transition section 21 and the interior of the smoke hood 2 located above the first transition section 21 are formed with air inlet channels, through which the flue gas in the smoke pipe 3 can flow into the fan box 1.

[0225] The first adapter 21 at the lower part of the smoke hood 2 is mainly used to adapt to the second adapter 31 at the upper part of the smoke pipe 3. The specific structure of the first adapter 21 can match the structure of the second adapter 31 at the upper part of the smoke pipe 3. For example, when the cross-section of the second adapter 31 of the smoke pipe 3 is circular, the cross-section of the first adapter 21 can also be circular; when the cross-section of the second adapter 31 of the smoke pipe 3 is rectangular, the cross-section of the first adapter 21 can also be rectangular. Of course, the structure of the second adapter 31 or the first adapter 21 is not limited to the above examples, and those skilled in the art can make other modifications as needed.

[0226] The cooperation relationship between the first transition part 21 at the lower part of the smoke hood 2 and the second transition part 31 at the upper part of the smoke pipe 3 can include various types.

[0227] Specifically, the first adapter 21 is inserted into the second adapter 31, and the outer surface of the first adapter 21 is fixedly and sealed to the inner surface of the second adapter 31 in a non-removable or detachable manner; or the second adapter 31 is inserted into the first adapter 21, and the inner surface of the first adapter 21 is fixedly and sealed to the outer surface of the second adapter 31 in a non-removable or detachable manner; or the first adapter 21 and the second adapter 31 are integrally formed.

[0228] The non-removable fixed sealing connection can be achieved by applying sealant, or by wrapping tape around the sealant application site, or by adding threaded fasteners and wrapping tape around the sealant application site, or by other methods, not limited to the above description. 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 this application, they should be covered within the scope of protection of this application.

[0229] The detachable sealing connection can include: setting a seal and setting a threaded fastener, or the setting of the threaded fastener can be replaced by other methods, such as a snap-fit ​​connection, or the detachable sealing connection can also be other methods, not limited to the above description. Those skilled in the art may make other changes under the guidance of the technical essence of this application, but as long as the function and effect achieved are the same as or similar to this application, they should be covered within the protection scope of this application.

[0230] Furthermore, the smoke inlet hood 2 can be integrally formed with the smoke pipe 3. For example, both the smoke pipe 3 and the smoke inlet hood 2 are plastic parts, and they are integrally injection molded.

[0231] Please refer to the following: Figure 8 and Figure 9 In some embodiments, the smoke hood 2 may further include an enlargement 22, which is located downstream of the first transition section 21 along the direction of smoke flow.

[0232] In this embodiment, the smoke inlet hood 2 can be a single, hollow, variable-section hood with a certain wall thickness. Specifically, the smoke inlet hood 2 is a plastic smoke inlet hood 2 or a metal smoke inlet hood 2. Of course, the material of the smoke inlet hood 2 can also be other types, and is not limited to the above description. 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 this application, they should all be covered within the scope of protection of this application. In the embodiments of this application, the smoke inlet hood 2 is mainly illustrated by being made of plastic. When the smoke inlet hood 2 is a plastic smoke inlet hood 2, it can be integrally injection molded, which not only helps to control the dimensional accuracy of each position of the smoke inlet hood 2, but also helps to reduce manufacturing costs and processing difficulty.

[0233] The fume hood 2 may include a first transition section 21 and an enlargement section 22. The enlargement section 22 is located downstream of the first transition section 21 along the direction of flue gas flow. The flow area of ​​the enlargement section 22 is larger than that of the first transition section 21. When the flue gas in the flue duct 3 enters the fan box 1 through the fume hood 2, the increased flow area reduces the speed and resistance of the flue gas flow, thus reducing noise and improving the noise reduction performance of the range hood.

[0234] When the smoke inlet hood 2 is provided with the enlarged portion 22, the enlarged portion 22 is assembled with the fan housing 1. Specifically, the enlarged portion 22 covers the outer side of the fan housing 1, or the enlarged portion 22 extends into the inner side of the fan housing 1, or the upper end of the enlarged portion 22 is connected to the lower end of the fan housing 1.

[0235] The enlarged portion 22 at least partially covers the fan. When the enlarged portion 22 covers at least part of the fan, whether it is located inside or outside the fan housing 1, it is equivalent to adding a barrier to the noise transmission path of the fan, which helps to further improve the noise reduction performance of the range hood. In addition, when the enlarged portion 22 covers at least part of the fan, the height of the side panel of the fan housing 1 can be appropriately reduced. This is especially beneficial when the smoke inlet hood 2 is made of low-cost materials such as plastic, while the fan housing 1 is made of relatively high-cost sheet metal, which helps to reduce the cost of the range hood.

[0236] In this embodiment, when the smoke inlet hood 2 is provided with the enlarged portion 22, the enlarged portion 22 and the fan box 1 are connected at the connection point and are sealed and adapted to the lower part 101 of the fan box through the sealing structure 29.

[0237] like Figure 9As shown, in one embodiment, a connecting portion 20 is further provided between the enlarged portion 22 and the first transition portion 21, the connecting portion 20 including a platform portion or a gradually expanding portion.

[0238] In this embodiment, the enlarged portion 22 and the first transition portion 21 can be connected and transitioned by a connecting portion 20. Specifically, the connecting portion 20 can be a platform portion that extends entirely along a horizontal plane, or the connecting portion 20 can be a gradually enlarging portion with a gradually increasing cross-section, or the connecting portion 20 can also have other structures that facilitate the efficient introduction of flue gas flowing into the lower first transition portion 21 into the enlarged portion 22.

[0239] When the connecting part 20 is a platform part, the upper part of the first adapter part 21 is folded outward to form the platform part, and the outer edge of the platform part is folded outward to extend upward to form the enlarged part 22.

[0240] Alternatively, when the connecting portion 20 is a gradually expanding portion, the upper part of the first transition portion 21 extends outward and upward to form the gradually expanding portion, and the outer edge of the gradually expanding portion folds over and extends upward to form the enlarged portion 22.

[0241] like Figure 8 and Figure 9 As shown, in one embodiment, the connection between the enlarged portion 22 and the connecting portion 20 has a chamfer 23, which is located below the air inlet 111 of the volute 11 of the fan.

[0242] In this embodiment, by providing a chamfer 23 at the connection between the enlarged portion 22 and the connecting portion 20, 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 111 of the fan volute 11 with lower resistance.

[0243] Furthermore, by providing a chamfer 23 at the connection between the enlarged portion 22 and the connecting portion 20, the mechanical properties of the smoke inlet hood 2 at the variable cross-section position can be improved, stress concentration at the sharp corner position can be avoided, thereby ensuring that the smoke inlet hood 2 has a longer service life.

[0244] like Figure 8 and Figure 9 As shown, in one embodiment, the fume hood 2 has an oil leakage structure 27, which is used to guide oil from the gap between the fume hood 2 and the fan box 1 into the interior of the fume hood 2.

[0245] When a gap forms between the fume hood 2 and the fan housing 1, the oil condensed on the inner wall of the fan housing 1 will flow into the gap and accumulate there. The oil accumulated in the gap may pose a risk of leakage, and it is also easy for oil to leak out during disassembly. In addition, it may increase the difficulty of cleaning this structure.

[0246] In this embodiment, by setting an oil leakage structure 27 on the fume hood 2, the oil can be efficiently and quickly discharged downwards, thereby avoiding the accumulation of oil in the gap between the fume hood 2 and the fan box 1, thus eliminating the risk of oil leakage. There will be no oil leakage during disassembly, and it will not increase the difficulty of cleaning this structure.

[0247] In some embodiments, the smoke hood 2 at least partially shields at least part of the fan.

[0248] In this embodiment, at least part of the smoke hood 2 blocks at least part of the fan. Specifically, the smoke hood 2 and the fan at least partially overlap in the projection toward the vertical side. The smoke hood 2 is equivalent to adding a stop structure on the path of the fan's noise transmission, thereby using the smoke hood 2 to prevent the noise from the fan from being transmitted outward when it is working, thereby improving the noise reduction performance of the range hood.

[0249] In this embodiment, the fume hood 2 and the fan housing 1 are sealed together, ensuring that the fume hood 2 and the fan housing 1 remain relatively fixed and that fumes do not escape from the mating point. This also prevents noise generated by the fan during operation from escaping through the gap between the fume hood 2 and the fan housing 1. Furthermore, the sealed connection between the fume hood 2 and the fan housing 1 also prevents airflow from forming at the gap, thus preventing whistling sounds and affecting the noise reduction effect of the range hood.

[0250] Please refer to the following: Figure 5 and Figure 9 Specifically, the smoke inlet hood 2 includes a front hood wall 201, which covers at least part of the front side plate 131 of the fan box 1 and is sealed to the front side plate 131.

[0251] The fume hood 2 may include a front cover wall 201. Generally, range hoods are installed against a wall at the rear, and users are typically positioned in front of them. To prevent fumes and noise generated by the fan from escaping forward and to prevent sharp noise from between the front cover wall 201 of the fume hood 2 and the front panel 131 of the fan housing 1, thus affecting the user experience, the front cover wall 201 of the fume hood 2 can be sealed to the front panel 131 of the fan housing 1.

[0252] Furthermore, the smoke inlet hood 2 also includes a left hood wall 203 and a right hood wall 204. The left hood wall 203 covers at least part of the left side plate 133 of the fan box 1 and is sealed to the left side plate 133. The right hood wall 204 covers at least part of the right side plate 134 of the fan box 1 and is sealed to the right side plate 134.

[0253] In this embodiment, the smoke inlet hood 2 may further include a left hood wall 203 and a right hood wall 204 located on both sides of the front hood wall 201. The left hood wall 203 is correspondingly disposed with respect to the left side plate 133 of the fan housing 1, and is capable of covering at least part of the left side plate 133 of the fan housing 1. The left hood wall 203 is sealed to the left side plate 133. The right hood wall 204 is correspondingly disposed with respect to the right side plate 134 of the fan housing 1, and is capable of covering at least part of the right side plate 134 of the fan housing 1. The right hood wall 204 is sealed to the right side plate 134.

[0254] The technical effects achieved by the relative positional relationship and sealing connection between the left cover wall 203 and the left side plate 133, and the technical effects achieved by the relative positional relationship and sealing connection between the right cover wall 204 and the right side plate 134, can be referred to the technical effects described above for the front cover wall 201 and the front side plate 131, and will not be repeated here.

[0255] Furthermore, the smoke inlet hood 2 also includes a rear cover wall 202, which covers at least part of the rear side plate 132 of the fan box 1 and is sealed to the rear side plate 132.

[0256] In this embodiment, the fume hood 2 may further include a rear hood wall 202 opposite to the front hood wall 201. The rear hood wall 202 is disposed opposite to the rear side panel 132 of the fan housing 1, and is capable of covering at least a portion of the rear side panel 132 of the fan housing 1. The rear hood wall 202 is sealed to the rear side panel 132. The relative positional relationship between the rear hood wall 202 and the rear side panel 132, and the technical effects achieved by the sealed connection, can be referred to the technical effects described above for the front hood wall 201 and the front side panel 131, and will not be repeated here.

[0257] When the circumferential parts (front wall 201, rear wall 202, left wall 203 and right wall 204) of the smoke hood 2 overlap and are sealed with the side panel of the fan box 1, the noise reduction effect of the range hood can be further improved. At the same time, the versatility of the smoke hood 2 can be improved, making it applicable in more scenarios, including scenarios where it is installed vertically against the wall or suspended in the air.

[0258] In some embodiments, 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 and the vertical wall is greater than or equal to 45° and less than 90°.

[0259] 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°.

[0260] 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.

[0261] like Figure 21 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 docking with the smoke hood 2 and to facilitate corresponding assembly or disassembly operations by operators.

[0262] Please refer to the following: Figure 20 and Figure 21 In one embodiment, the smoke hood 2 covers at least a portion of the area of ​​the fan below the air inlet 111 of the volute 11.

[0263] For the aforementioned fan, which is installed vertically, the fan has a volute 11 with an air inlet 111 arranged along the height direction Z. The air inlet 111 can be located in the middle of the volute 11. The air inlet 111 has a relatively highest and lowest position. The highest position (uppermost point) of the smoke hood 2 can be located below the lowest position of the air inlet 111 and can cover at least part of the volute 11.

[0264] Thus, since the smoke inlet hood 2 covers at least part of the volute 11, the height of the fan box 1 can be appropriately reduced, thereby lowering the cost of the range hood. In particular, when the smoke inlet hood 2 is made of relatively low-cost plastic, while the fan box 1 is made of a material with higher material costs than plastic, such as sheet metal, the cost of the range hood can be significantly reduced.

[0265] When the highest position of the smoke hood 2 is below the lowest position of the air inlet 111, the operating height for installing and disassembling the smoke hood 2 and the fan box 1 is not too high, which helps to ensure the convenience of subsequent inspection and maintenance operations.

[0266] Furthermore, the highest position of the projection of the smoke hood 2 toward the volute 11 of the fan is close to or located at the lower edge of the air inlet 111 of the volute 11.

[0267] More specifically, the highest position of the projection of the smoke hood 2 toward the fan volute 11 is close to the lower edge (i.e., the lowest position) of the air inlet 111 of the volute 11. Here, "close to" can mean that the highest position of the projection of the smoke hood 2 toward the fan volute 11 is slightly higher or slightly lower than the lower edge of the air inlet 111 of the volute 11.

[0268] When the smoke inlet hood 2 and the air inlet 111 of the volute 11 are in the aforementioned relative positional relationship, taking the smoke inlet hood 2 located between the fan housing 1 and the volute 11 as an example, the smoke inlet hood 2 can smoothly transition the flue gas flowing in from the smoke pipe 3 to the air inlet 111 of the volute 11, reducing the possibility of airflow directly impacting the inner wall of the volute 11 or forming vortices near the air inlet 111. In short, when the smoke inlet hood 2 and the air inlet 111 of the volute 11 are in the aforementioned relative positional relationship, the airflow can enter the fan more smoothly, improving the fan's intake efficiency and thus enhancing the performance of the entire system.

[0269] In one embodiment, the smoke hood 2 covers at least a portion of the air inlet 111 of the fan's volute 11.

[0270] For the aforementioned vertically installed fan, the fan has a volute 11, on which an air inlet 111 is provided, arranged along the height direction Z. The air inlet 111 can be located in the middle of the volute 11. The air inlet 111 has a relatively highest and lowest position. The highest position (uppermost point) of the smoke hood 2 can be located above the lowest position of the air inlet 111, thereby at least covering a portion of the air inlet 111 of the fan volute 11.

[0271] Thus, since the fume hood 2 covers at least part of the air inlet 111 of the volute 11, the height of the fan housing 1 can be further reduced, thereby further reducing the cost of the range hood. In particular, when the fume hood 2 is made of relatively low-cost plastic, while the fan housing 1 is made of a material with higher material costs than plastic, such as sheet metal, the cost of the range hood can be significantly reduced.

[0272] Specifically, the overlapping area of ​​the projection of the smoke hood 2 toward the air inlet 111 of the fan volute 11 and the air inlet 111 of the volute 11 is greater than, equal to or less than 1 / 2 of the area of ​​the air inlet 111 of the volute 11.

[0273] For example, the overlapping area of ​​the projection of the smoke hood 2 toward the air inlet 111 of the fan volute 11 and the air inlet 111 of the volute 11 can be close to or equal to half the area of ​​the air inlet 111 of the volute 11.

[0274] With this configuration, taking the smoke inlet hood 2 located on the outside of the fan box 1 as an example, there is a certain degree of overlap between the outside of the fan box 1 and the inside of the smoke inlet hood 2. When the oil condensed on the inner surface of the fan box 1 seeps outward, it needs to pass through the aforementioned overlap before it can seep out. In other words, the smoke inlet hood 2 and the fan box 1 work together to extend the flow path of the oil seepage, thereby reducing the risk of oil seepage.

[0275] In other embodiments, the centerline of the impeller of the fan is parallel to the wall, or the angle between the centerline of the impeller of the fan and the wall is greater than 0° and less than 45°.

[0276] In this embodiment, the centerline of the impeller of the fan is parallel 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 0° and less than 45°, specifically referring to the fan being installed horizontally. When the fan is installed horizontally, the centerline of the impeller can be vertically aligned or inclined at a small angle relative to the vertical direction. When the centerline of the impeller is inclined at a small angle relative to the vertical direction, the angle between the centerline of the impeller and the vertical direction is within 45°.

[0277] In one embodiment, the projection of the smoke hood 2 toward the volute 11 of the fan is at least above the air inlet 111 of the volute 11 of the fan.

[0278] In this embodiment, the fan is horizontally mounted, and the volute 11 includes at least one air inlet 111 at the bottom. In the height direction Z, the highest point of the fume hood 2 is higher than the air inlet 111 of the volute 11. Since the fume hood 2 covers the air inlet 111 of the volute 11, the height of the fan housing 1 can be reduced, thereby lowering the cost of the range hood. This is especially true when the fume hood 2 is made of relatively low-cost plastic, while the fan housing 1 is made of a material with higher cost, such as sheet metal, significantly reducing the cost of the range hood. Furthermore, by providing the fume hood 2 around the air inlet 111, noise generated during fan operation can be blocked, thereby improving the noise reduction performance of the range hood.

[0279] Furthermore, the projection of the smoke inlet hood 2 toward the volute 11 of the fan coincides at least with the impeller of the fan.

[0280] Thus, since the fume hood 2 covers at least part of the fan impeller, which is located above the air inlet 111, it effectively extends the highest point of the fume hood 2 upwards. This allows for a further reduction in the height of the fan housing 1, thereby further lowering the cost of the range hood. In particular, when the fume hood 2 is made of relatively low-cost plastic, while the fan housing 1 is made of a higher-cost material, such as sheet metal, the cost of the range hood can be significantly reduced.

[0281] like Figure 20 and Figure 21 As shown, in some embodiments, the lower part of the volute 11 of the fan protrudes from the fan housing 1 in the height direction Z.

[0282] In this embodiment, because the fan housing 1 has a smoke inlet hood 2 at its lower part, the height of the fan housing 1 can be reduced. When the height of the fan housing 1 is reduced to a certain extent, the lower part of the fan casing 11 protrudes from the fan housing 1. Reducing the height of the fan housing 1 helps to lower its manufacturing cost. In particular, when the smoke inlet hood 2 is made of relatively low-cost plastic, while the fan housing 1 is made of a material with higher material cost than plastic, such as sheet metal, the cost of the range hood can be significantly reduced.

[0283] In one embodiment, the height difference between the lowest position of the lower part of the volute 11 and the lowest position of the fan box 1 is more than 15 mm and / or less than 220 mm.

[0284] In this embodiment, the fan housing 1 houses a fan. The fan housing 1 has an outlet 102 for discharging flue gas from the outlet of the fan's volute 11, and a smoke outlet seat 5 is installed at the outlet 102. The diameter of the smoke outlet seat 5 is D1, for example, D1 is 160 mm. For vertically installed fans, the height of the volute 11 is generally D2. The height of the fan housing 1 must be at least greater than the height of the outlet of the volute 11. In this case, the maximum protrusion of the lower part of the volute 11 from the fan housing 1 (the height difference between the lowest point of the lower part of the volute 11 and the lowest point of the fan housing 1) is approximately the difference between D2 and D1. When the height of the volute 11 is 380 mm, the maximum protrusion of the lower part of the volute 11 from the fan housing 1 is 220 mm.

[0285] Furthermore, since a smoke hood 2 is installed at the air inlet of the fan housing 1, the smoke hood 2 can serve as part of the function of the fan housing 1. Therefore, the height of the fan housing 1 can be reduced relative to the original height. For example, the lower part of the volute 11 can be located at least 15 mm above the lowest point of the fan housing 1, thus ensuring that the height of the fan housing 1 is reduced. Of course, as the height of the fan housing 1 gradually decreases, the lower part of the volute 11 will protrude from the fan housing 1, until the aforementioned extreme position, that is, the lower part of the volute 11 protrudes from the fan housing 1 by approximately 220 mm.

[0286] Of course, in this embodiment, the above values ​​are mainly illustrated using the size of a currently widely applicable wind turbine as an example. When the dimensions of the wind turbine casing 1 and the wind turbine volute 11 change, the above boundary values ​​can also be adjusted adaptively.

[0287] In one embodiment, the ratio of the height difference between the lowest position of the lower part of the volute 11 and the lowest position of the fan box 1 to the total height of the volute 11 is more than 4% and / or less than 60%.

[0288] Similar to the above embodiments, taking a total height of volute 11 of 380 mm as an example, when the height difference between the lowest position of the lower part of volute 11 and the lowest position of the fan box 1 is more than 15 mm and / or less than 220 mm, the ratio of the height difference between the lowest position of the lower part of volute 11 and the lowest position of the fan box 1 to the total height of volute 11 is more than 4% and / or less than 60%.

[0289] In one embodiment, the height of any one of the front side plate 131, rear side plate 132, left side plate 133, and right side plate 134 of the fan box 1 is not greater than 385 mm.

[0290] In this embodiment, the cross-section of the fan housing 1 can be rectangular or quasi-rectangular. The fan housing 1 has opposing front side panels 131 and rear side panels 132, as well as opposing left side panels 133 and right side panels 134. For a conventional fan housing 1, its height is about 400 mm. However, in this embodiment, since the height of the fan housing 1 can be reduced, the height of the fan housing 1 can be shortened by at least 15 mm, so that the height of the front side panel 131, rear side panel 132, left side panel 133, and right side panel 134 is no greater than 385 mm.

[0291] When the lower part of the fan casing 11 protrudes from the fan housing 1, the lowest position of the fan housing 1 relative to the air inlet 111 of the fan casing 11 can have several possible configurations. Specifically, the lowest position of the fan housing 1 in the height direction Z may be above the lowest position of the air inlet 111 of the fan casing 11, or close to or flush with the lowest position of the air inlet 111 of the fan casing 11, or below the lowest position of the air inlet 111 of the fan casing 11.

[0292] In cases where the lowest position of the fan housing 1 is close to, flush with, or below the lowest position of the air inlet 111 of the fan volute 11 in the height direction Z, a noise reduction structure is also provided on the inner surface of the fan housing 1, and the noise reduction structure is arranged opposite to the air inlet 111 of the fan volute 11.

[0293] In this embodiment, when the lowest position of the fan housing 1 is near or below the lowest position of the air inlet 111 of the fan volute 11 in the height direction Z, in order to reduce the noise that may be transmitted outward from the air inlet 111 of the fan, a noise reduction structure can be provided on the inner surface of the fan housing 1 at a position opposite to the air inlet 111.

[0294] like Figure 7 As shown, specifically, the noise reduction structure may include: a noise reduction layer and a fixing mechanism 65 for fixing the noise reduction layer to the inner surface of the fan housing 1.

[0295] In this embodiment, the specific form of the noise reduction structure can be selected according to the needs of the actual application scenario. For example, the noise reduction structure may include a noise reduction layer and a fixing mechanism 65 for fixing the noise reduction layer. The fixing mechanism can cooperate with the inner surface of the fan housing 1, thereby reliably installing the noise reduction layer on the inner surface of the fan housing 1. Specifically, the noise reduction layer may include any one or a combination of the following: a sound-absorbing material layer, a sound-insulating material layer, and a damping material layer, etc.

[0296] To maximize the noise reduction effect of the noise reduction layer, the fixing mechanism 65 has a non-microporous perforated structure on its surface. Compared to a microporous fixing mechanism, this perforated structure allows the noise generated by the fan to fully contact the noise reduction layer, resulting in a more ideal noise reduction effect. The perforated structure can be in the form of a cross, a triangular frame, or any other shape or structure, as long as it ensures stable fixing of the noise reduction structure and allows for sufficient contact between the fan noise and the noise reduction structure. The fixing mechanism 65 can be integrally formed on the inner surface of the fan housing 1 or fixed to the inner surface of the fan housing 1 by installation. Alternatively, in some special cases, such as when the noise reduction structure itself is adhesive, the fixing mechanism can be omitted.

[0297] Furthermore, in some other embodiments of this application, in the height direction Z, the bottom of the fan housing 1 is lower than the bottom of the fan volute 11, or the bottom of the fan housing 1 is flush with the bottom of the fan volute 11.

[0298] In the embodiment where the bottom of the fan housing 1 is slightly lower than or flush with the bottom of the fan volute 11, its cooperation with the smoke inlet hood 2 can, to some extent, reduce the height of the side panel of the fan housing 1. Reducing the height of the fan housing 1 also helps to lower its manufacturing cost. In particular, when the smoke inlet hood 2 is made of relatively inexpensive plastic, while the fan housing 1 is made of a material with higher cost, such as sheet metal, the cost of the range hood can be significantly reduced.

[0299] Please refer to the following: Figures 20 to 21 In some embodiments, the range hood may further include a smoke outlet seat 5, which is used for installation above the ceiling 6; the fan box 1 includes a first side plate and a second side plate disposed opposite to each other, the first side plate (corresponding to Figure 5 The upper part of the right side plate 134 shown has a fan box outlet; the mounting part of the smoke outlet seat 5 is located on the inner side of the upper part of the first side plate or the mounting part of the smoke outlet seat 5 is located on the outer side of the upper part of the first side plate; the smoke outlet of the fan volute 11 is connected to the smoke outlet seat 5; the upper part of the first side plate is inclined from bottom to top toward the second side plate, and the upper part of the first side plate and the lower part of the first side plate have a non-zero included angle.

[0300] In this embodiment, the range hood may also be equipped with a smoke outlet seat 5, which is located at the outlet of the fan box 1 and is used to connect the outlet of the fan box 1 to the exhaust pipe. In an installation environment with a suspended ceiling 6, the smoke outlet seat 5 is installed above the suspended ceiling 6.

[0301] The fan housing 1 may include a first side plate and a second side plate arranged opposite to each other. The first side plate and the second side plate may be a right side plate 134 and a left side plate 133 opposite to each other. The upper part of one of the first side plate and the second side plate may be provided with the outlet of the fan housing 1. The smoke outlet of the volute 11 of the fan is connected to the smoke outlet seat 5. When the fan is started, the smoke generated during cooking can flow through the smoke outlet of the volute 11 and through the smoke outlet seat 5 under the suction action of the fan.

[0302] Taking the upper part of the first side plate as an example where the outlet of the fan box 1 is provided, since the smoke outlet seat 5 is provided corresponding to the outlet of the fan box 1, the smoke outlet seat 5 is also provided on the upper part of the first side plate. Specifically, the smoke outlet seat 5 has a mounting part for cooperating with the first side plate, and the mounting part can be located on the inner or outer side of the upper part of the first side plate.

[0303] The specific form of the mounting part can be a flange ring whose outer contour matches the structure of the outlet of the fan box 1. When the outlet of the fan box 1 is a rectangular hole, the flange ring can be rectangular; when the outlet of the fan box 1 is a circular hole, the flange ring can be circular. When the outlet of the fan box 1 has other structures, the structure of the flange ring can be adapted accordingly. Specifically, this application does not impose a unique limitation on the specific structure of the mounting part.

[0304] To achieve a fixed connection between the smoke outlet seat 5 and the fan housing 1, the flange ring can be provided with multiple fastening holes spaced apart along its circumference. The smoke outlet seat 5 and the fan housing 1 can be relatively fixed by installing fasteners in these fastening holes.

[0305] In this embodiment, the upper part of the first side plate with the outlet of the fan box 1 is inclined from bottom to top toward the second side plate. The upper part of the first side plate and the lower part of the first side plate have a non-zero angle. With this configuration, when the fan box 1 is to be installed above the ceiling 6, the smoke outlet seat 5 is also inclined with the upper part of the first side plate. The overall lateral dimension of the fan box 1 and the smoke outlet seat 5 is small, which can reduce the opening size of the ceiling 6. In addition, it is also beneficial to reduce the height occupied by the smoke outlet seat 5, thereby making full use of the limited height space above the ceiling 6. Even when the height between the ceiling 6 and the top wall 7 is limited, the smoke outlet seat 5 can be installed smoothly above the ceiling 6.

[0306] In one embodiment, the fan box 1 is installed on or near the top wall 7.

[0307] In this embodiment, the fan box 1 is specifically installed on the ceiling wall 7, that is, the top of the fan box 1 is fixed to the ceiling wall 7, or the fan box 1 is set close to the ceiling wall 7, that is, the top of the fan box 1 is within a small distance from the ceiling wall 7. When the fan box 1 is directly installed on or close to the ceiling wall 7, it is beneficial to realize the split installation of the range hood, and at the same time, the height requirement of the suspended ceiling 6 is lower, so that the noise source is as far away from the user as possible.

[0308] like Figure 21 As shown, specifically, the height difference between the top of the fan box 1 and the top wall 7 is no more than 90 mm.

[0309] In a typical kitchen environment with a suspended ceiling 6, the height of the suspended ceiling 6 (i.e., the distance from the suspended ceiling 6 to the top wall 7) is usually around 250 mm. The smoke outlet seat 5 of the fan box 1 and the exhaust pipe connected to the smoke outlet seat 5 are usually located on the suspended ceiling 6. The diameter of the exhaust pipe is usually between 160 mm and 180 mm.

[0310] In this embodiment, the height difference H2 between the top of the fan box 1 and the top wall 7 can be controlled within 90 mm. Thus, with a ceiling height of 250 mm, the largest existing exhaust pipe can be installed in the ceiling 6.

[0311] It should be noted that the height difference H2 between the top of the fan box 1 and the top wall 7 is mainly determined based on the difference between the height of the suspended ceiling 6 and the maximum diameter of the exhaust pipe. The above-mentioned data defined in the embodiments of this application can be adapted to the currently more conventional suspended ceiling 6 height and exhaust pipe size.

[0312] For the fan box 1, when it is installed on or near the top wall 7, the installation state of its smoke outlet seat 5 after it is installed on the fan box 1 can include a variety of spatial configurations. Specifically, the smoke outlet seat 5 can extend downwards in a direction away from the fan box 1, or the smoke outlet seat 5 can extend horizontally in a direction away from the fan box 1, or the smoke outlet seat 5 can extend upwards in a direction away from the fan box 1 and the highest point of the smoke outlet seat 5 is not higher than the top of the fan box 1, or the smoke outlet seat 5 can extend upwards in a direction away from the fan box 1 and the height difference between the highest point of the smoke outlet seat 5 and the top of the fan box 1 is not greater than the height difference H2 between the top wall 7 and the top of the fan box 1.

[0313] Overall, for the fan box 1 with the smoke outlet seat 5, when the fan box 1 is installed on or near the top wall 7, it can at least ensure that the noise source is far away from the human ear, so that the split range hood can have a better noise reduction effect.

[0314] Specifically, for the smoke outlet seat 5, different technical effects are achieved when it is set in different installation states.

[0315] When the smoke outlet seat 5 extends horizontally or downwards away from the fan housing 1, it improves the anti-interference performance during range hood installation. For example, when there is a beam or similar structure on the top wall 7, the downward-facing smoke outlet seat 5 allows the connected exhaust pipe to avoid the beam. Alternatively, for example, if the opening of the user's public flue is too low, the downward-facing smoke outlet seat 5 allows for accurate installation and connection of the exhaust pipe. Furthermore, for the fan, the smoke flowing out of the outlet of the volute 11 is influenced by the structure of the volute 11 itself and inertial forces, resulting in an overall downward-sloping flow trend. When the smoke outlet seat 5 extends downwards, it facilitates the discharge of smoke from the fan with lower resistance, higher airflow, and lower noise.

[0316] When the smoke outlet seat 5 extends horizontally in a direction away from the fan box 1, the flue gas flowing out of the fan can be discharged through the smoke outlet seat 5 with low resistance, large air volume, and low noise. In addition, when the smoke outlet seat 5 extends horizontally in a general direction, the installation space required when it is matched with the smoke exhaust pipe is minimized.

[0317] When the exhaust seat 5 extends upwards at an angle away from the fan box 1, it can further utilize the space of the ceiling 6, keeping the noise generated by the airflow away from the ears and improving the noise reduction performance of the range hood. In addition, considering that the position of the public flue is relatively high, when the exhaust seat 5 extends upwards at an angle, it can be convenient for the exhaust pipe connected from the exhaust seat 5 to the opening of the public flue.

[0318] In the case where the smoke outlet seat 5 extends upwards as a whole, in order to prevent the highest point of the smoke outlet seat 5 from interfering with the top wall 7, the highest point of the smoke outlet seat 5 can be made not higher than the top of the fan box 1, or the smoke outlet seat 5 can extend upwards as a whole in a direction away from the fan box 1 and the height difference between the highest point of the smoke outlet seat 5 and the top of the fan box 1 is not greater than the height difference between the top wall 7 and the top of the fan box 1, so as to ensure that the smoke outlet seat 5 of the fan box assembly does not interfere with the top wall 7 above the ceiling 6 after it is installed above the ceiling 6.

[0319] In one embodiment, the smoke outlet seat 5 extends horizontally in a direction away from the fan box 1. The smoke outlet seat 5 has a smoke inlet end and a smoke outlet end. The smoke outlet end is generally vertically or inclined. The smoke inlet end is inclined from bottom to top in a direction away from the smoke outlet end.

[0320] In this embodiment, the smoke outlet seat 5 can extend horizontally as a whole. Specifically, the smoke outlet seat 5 can include a tubular body with a centerline that extends horizontally. The smoke outlet seat 5 also includes a flue gas inlet end and a flue gas outlet end. The flue gas inlet end is used to connect to the fan box 1, and the flue gas outlet end is used to connect to the exhaust pipe. The specific structure of the flue gas outlet end can be adapted to the structure of the connecting end of the exhaust pipe to which it is assembled. For example, the flue gas outlet end can be vertically or inclined.

[0321] The specific structure of the flue gas inlet end can be adapted to the structure of the side plate of the fan box 1 to which it is assembled. For example, when the upper part of the first side plate of the fan box 1 used to set the smoke outlet seat 5 is inclined from bottom to top toward the second side plate, that is, when the upper part of the first side plate and the lower part of the first side plate have a non-zero angle, the flue gas inlet end is also inclined, and the plane where the flue gas inlet end is located is parallel to the first side plate.

[0322] like Figure 19 As shown, the top tangent of the outlet of the volute 11 of the fan extends horizontally. When the smoke outlet seat 5 extends horizontally as a whole, and the smoke inlet of the smoke outlet seat 5 is parallel to the first side plate of the fan box 1, the smoke flowing out of the fan can flow into the exhaust pipe through the smoke outlet seat 5 with low resistance, large air volume, and low noise, and then be discharged outward. In addition, when the smoke outlet seat 5 extends horizontally as a whole, the installation space required when it is matched with the exhaust pipe is minimized.

[0323] In one embodiment, the smoke outlet seat 5 extends upward in a direction away from the fan box 1, and the smoke outlet seat 5 has a flue gas inlet end and a flue gas outlet end. The flue gas outlet end is generally arranged vertically or inclined, and the flue gas inlet end is inclined from bottom to top in a direction away from the flue gas outlet end.

[0324] In this embodiment, the main difference from the above embodiment is that the smoke outlet seat 5 extends upwards as a whole. Installation problems may arise for the smoke outlet seat 5 and the exhaust pipe. For example, if the exhaust pipe opening in the public flue is too high, the exhaust pipe leading from the smoke outlet seat 5 cannot easily connect with the exhaust pipe opening. In this case, the smoke outlet seat 5 may need to extend upwards as a whole to overcome the aforementioned installation and connection problems.

[0325] As for the smoke outlet seat 5, when it extends upward as a whole, it can further utilize the space of the ceiling 6, keeping the noise generated by the airflow away from people's ears and improving the noise reduction performance of the range hood.

[0326] In one embodiment, the smoke outlet seat 5 extends downward in a direction away from the fan box 1. The smoke outlet seat 5 has a flue gas inlet end and a flue gas outlet end. The flue gas outlet end is generally vertically or inclined. The flue gas inlet end is inclined from bottom to top in a direction away from the flue gas outlet end.

[0327] In this embodiment, the main difference from the above embodiment is that the smoke outlet seat 5 extends downwards as a whole. For the smoke outlet seat 5 and the smoke exhaust pipe, some interference problems may be encountered during installation (e.g., a beam is installed on the top wall 7), or the opening for the smoke exhaust pipe may be too low. In such cases, the smoke outlet seat 5 may need to extend downwards as a whole to overcome the aforementioned interference problems and / or installation connection problems.

[0328] For the fan, the flue gas flowing out of the outlet of the volute 11 is affected by the structure of the volute 11 itself and the inertial force, and generally tends to flow downward. When the smoke outlet seat 5 extends downward as a whole, it is most conducive to the flue gas flowing out of the fan flowing into the exhaust pipe with lower resistance, larger air volume and lower noise, and then being discharged outward.

[0329] In one embodiment, the plane where the mounting part of the smoke outlet seat 5 is located is parallel to the plane where the outlet of the fan box 1 is located on the upper part of the first side plate.

[0330] Specifically, the smoke outlet seat 5 has a mounting portion for cooperating with the first side plate. This mounting portion can be located on the inner or outer side of the upper part of the first side plate. The specific form of the mounting portion can be referred to the detailed description of the above embodiments, and will not be repeated here. The plane where the mounting portion is located can be parallel to the plane where the outlet of the fan box 1 is located, thereby ensuring that the smoke outlet seat 5 can be tightly connected with the fan box 1, which is beneficial for the smooth flow of flue gas at the connection point.

[0331] Furthermore, when the top of the outlet of the volute 11 of the fan is located close to the top plate 135 of the fan box 1, the inclination direction of the first side plate is consistent with the inclination direction of the plane where the outlet of the volute 11 is located. This arrangement is beneficial to setting the air outlet 102 opened on the first side plate towards the top of the fan box 1, thereby reducing the height dimension between the ceiling 6 and the top wall 7 required by the fan box 1, and improving the universality of the range hood installation.

[0332] like Figure 5 As shown, in one embodiment, the angle Q between the plane containing the upper part of the first side plate and the vertical direction is less than 14.9°, or greater than 15.1° and less than or equal to 75°, or equal to 15°.

[0333] In this embodiment, the upper part of the first side plate is inclined. Specifically, the angle Q between the plane where the upper part of the first side plate is located and the vertical direction can be within 14.9°; or, the angle Q between the plane where the upper part of the first side plate is located and the vertical direction can be between 15.1° and 75°; or, the angle Q between the plane where the upper part of the first side plate is located and the vertical direction can be equal to 15°.

[0334] When setting the tilt angle of the upper part of the first side plate, it is necessary to take into account a variety of factors such as the performance of the fan and the compatibility of the installation.

[0335] Specifically, before installing the fan box assembly into the ceiling 6, the smoke outlet seat 5 needs to be installed on the first side plate of the fan box 1, and then the entire assembly is installed into the ceiling 6 through the opening.

[0336] Theoretically, the greater the inclination angle of the upper part of the first side plate, the smaller the projected size of the smoke outlet seat 5 towards the ceiling when the opening on the ceiling 6 is fixed. In the horizontal direction, this is more conducive to reducing the installation size required for the fan box assembly, that is, it is more conducive to the upper part of the fan box 1 passing through the opening on the ceiling 6 and being installed on the ceiling 6. At this time, the angle Q between the plane where the upper part of the first side plate is located and the vertical direction can be greater than 15.1° and less than or equal to 75°.

[0337] Generally, for range hoods, the exhaust pipe needs to extend horizontally at least at its end to connect with the opening of the common flue. For range hoods, the smoke from the exhaust port of the fan casing 11 is subject to inertial force and flows downwards at an angle.

[0338] The greater the inclination angle of the upper part of the first side plate, the greater the angle between it and the inertial force of the flue gas at the outlet of the fan volute 11, and the greater the pressure loss generated when the flue gas changes from the outlet to the horizontal direction and is discharged into the exhaust pipe.

[0339] To minimize the pressure loss of the flue gas discharged from the outlet of the fan casing 11, the inclination angle of the upper part of the first side plate can be appropriately reduced. For example, the angle Q between the plane containing the upper part of the first side plate and the vertical direction can be within 14.9° or equal to 15°.

[0340] Furthermore, when the angle Q between the plane containing the upper part of the first side plate and the vertical direction is within 14.9° or equal to 15°, after the smoke outlet seat 5 is installed on the first side plate, the size of the smoke outlet seat 5 in the height direction will be reduced relative to the axial length of the smoke outlet seat 5, so that the installation height of the fan box 1 can be controlled within a reasonable range. The smoke outlet seat 5 can improve the installation adaptability of the fan box assembly above the ceiling 6 by utilizing its smaller size in the height direction.

[0341] In some other embodiments, a transition piece may be provided between the outlet of the fan casing 11 and the upper part of the first side plate for connection and transition. Overall, the tilt angle of the first side plate can be adapted to the required installation conditions in combination with the fan performance and installation adaptability.

[0342] In addition, considering that the exhaust pipe generally needs to be connected to the side wall, the angle Q between the plane where the upper part of the first side plate is located and the vertical direction should not be too large, for example, it can be within 75°, so that the upper part of the fan box 1, the smoke outlet seat 5 and the exhaust pipe can be arranged in a compact and reasonable structure within the limited space between the ceiling 6 and the top wall 7.

[0343] Preferably, the angle Q between the plane containing the upper part of the first side plate and the vertical direction can be within 45°. If the angle Q between the plane containing the upper part of the first side plate and the vertical direction is large, for example, greater than 45°, taking the axis of the smoke outlet seat 5 being perpendicular to the first side plate as an example, the opening of the smoke outlet seat 5 tends to face the top wall 7. Generally, for the user's public flue, the opening is usually on the side wall, and a large angle is formed between the smoke outlet seat 5 and the user's public flue, making it inconvenient for the smoke outlet seat 5 to connect with the public flue through the exhaust pipe. In addition, when the angle Q between the plane containing the upper part of the first side plate and the vertical direction is too large, the size of the smoke outlet seat 5 in the height direction will be large. Thus, when the top of the fan box 1 is very close to the top wall 7, the smoke outlet seat 5 may interfere with the top wall 7.

[0344] In one embodiment, the length of the upper part of the first side plate is greater than or equal to a preset ratio of the total length of the first side plate, and the preset ratio is not less than 40% to 90%.

[0345] In this embodiment, the first side plate may include an inclined upper portion and a vertically extending lower portion. The upper portion of the first side plate is primarily used to create an air outlet 102, for mounting a smoke outlet seat 5, and for directly connecting to the outlet of the fan volute 11. This first side plate cooperates with other side plates to mount the main body of the fan volute 11.

[0346] The upper part of the first side plate serves as the base for setting the smoke outlet seat 5, and the length of the upper part of the first side plate can match the diameter of the smoke outlet seat 5. For example, when the diameter of the smoke outlet seat 5 is 160 mm, the length of the upper part of the first side plate can be slightly greater than 160 mm; for example, when the diameter of the smoke outlet seat 5 is 180 mm, the length of the upper part of the first side plate can be slightly greater than 180 mm.

[0347] In embodiments where the smoke inlet hood 2 and the fan housing 1 partially overlap, the lower part of the first side plate has at least an installation height sufficient to overlap with the smoke inlet hood 2, so as to provide a connection structure. For example, this installation height is at least 10 mm.

[0348] The maximum value of the preset ratio of the upper part of the first side plate to the total length of the first side can be the ratio of the diameter of the smoke outlet seat 5 to (the diameter of the smoke outlet seat 5 + the installation height of the lower part of the first side plate). This preset ratio can reach a maximum of 90%.

[0349] For embodiments where the size of the fan volute 11 needs to at least partially protrude from the fan housing 1, if the height of the fan volute 11 is 380 mm, then the minimum value of the preset ratio of the length of the upper part of the first side plate to the total length of the first side can be the ratio of the diameter of the smoke outlet seat 5 to the height of the fan volute 11. This preset ratio can be at least 40%.

[0350] Overall, considering that a small lower dimension of the first side panel of the fan housing 1 would compromise the strength of the fan housing 1, the preset ratio should not be too large, for example, within 1 / 2, to ensure sufficient strength of the fan housing 1.

[0351] In one embodiment, the upper part of the first side plate has a vertical height of less than or equal to 300 mm.

[0352] In this embodiment, the upper part of the first side plate serves as the mounting base for the smoke outlet seat 5. To install the smoke outlet seat 5 and the exhaust pipe connected to it above the ceiling 6, the vertical height of the upper part of the first side plate can be controlled according to the height of the ceiling 6. Specifically, the vertical height of the upper part of the first side plate is within the height of the ceiling 6. For example, when the height of the ceiling 6 is 250 mm, the vertical height of the upper part of the first side plate is within 250 mm.

[0353] When the vertical height of the upper part of the first side panel is controlled within 300 mm, it can be ensured that the smoke outlet seat 5 does not protrude downwards from the ceiling 6. Basically, no matter how the existing smoke outlet seat 5 is installed at an angle, it can be positioned above the ceiling 6 when it is matched with the first side panel.

[0354] Furthermore, when the first side plate is inclined, a right-angled space is formed in the inclined part. In this application, the smoke outlet seat 5 is installed in the right-angled space, and the height of the upper part of the first side plate is reasonably controlled based on the size of the smoke outlet seat 5. This also helps to control the opening size required when the fan box 1 is installed into the ceiling 6, that is, it can ensure that the opening size is as small as possible and the overall structure is reasonable and compact.

[0355] In one embodiment, the range hood may further include a decorative cover 8, the maximum cross-section of which is projected downwards into the outlet of the lower cavity 4, so that the decorative cover 8 can cover the air outlet of the lower cavity 4 and the smoke inlet hood 2.

[0356] In some installation scenarios, considering that the exhaust pipe 3 and the smoke inlet hood 2 above the lower cavity 4 of the range hood may not have corresponding cabinets for concealed installation, the range hood may also include a decorative cover 8 to ensure the overall aesthetics of the range hood. The cross-sectional area of ​​the decorative cover 8 can be a constant value; for example, the cross-sectional area of ​​the decorative cover 8 can be close to (slightly larger than) the area of ​​the maximum cross-section of the smoke inlet hood 2. Of course, in the embodiments of this application, it is not excluded that the decorative cover 8 is in the form of a variable cross-section.

[0357] One end of the decorative cover 8 can be connected to the air outlet of the lower cavity 4, and the other end can be located at the maximum cross-section of the smoke inlet hood 2. When the decorative cover 8 is a constant value, since the maximum cross-section of the smoke inlet hood 2 can be less than or equal to the cross-section where the outlet of the lower cavity 4 is located, the decorative cover 8 with a constant cross-section can be pulled upward from the outlet of the lower cavity 4 to cover the periphery of the smoke pipe 3 and the smoke inlet hood 2.

[0358] 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.

[0359] 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.

[0360] 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. A range hood, characterized in that, the range hood comprises a fan box, an inlet hood, a smoke pipe and a lower cavity, the fan box, the inlet hood, the smoke pipe and the lower cavity are sequentially connected from top to bottom; the fan box is provided with a fan, the fan is used for being arranged at least partially above a ceiling, the inlet hood is connected with the fan box at a connection position, the inlet hood and the lower part of the fan box are sealed and matched by a sealing structure.

2. The range hood according to claim 1, characterized in that, the connection position is higher than the sealing structure in the height direction.

3. The range hood according to claim 1, characterized in that, the upper part of the inlet hood is arranged outside the fan box, or, the upper part of the inlet hood extends into the inside of the fan box, or, the upper end of the inlet hood and the lower end of the fan box are connected.

4. The range hood according to claim 3, characterized in that, the inlet hood is connected outside the fan box and shields at least part of the fan box.

5. The range hood according to claim 4, characterized in that, the size of the at least part of the fan box shielded in the height direction is between 10 mm and 500 mm.

6. The range hood according to claim 4, characterized in that, the cover wall of the inlet hood is inwardly bent to form a flange part or the inner surface of the cover wall of the inlet hood is provided with a flange part, the flange part is used for limiting the lower part of the fan box, and the flange part and / or the cover wall and the lower part of the fan box are provided with the sealing structure.

7. The range hood according to claim 6, characterized in that, the flange part is provided with a socket, the lower part of the fan box is provided with a plug, or the flange part is provided with a plug, and the lower part of the fan box is provided with a socket.

8. The range hood according to claim 6, characterized in that, the flange part is provided with a plug, and the lower part of the fan box comprises a flange extending into the inside of the fan box, and the flange is provided with a socket.

9. The range hood according to claim 4, characterized in that, the cover wall of the inlet hood is inwardly bent to form a groove or the inner surface of the cover wall of the inlet hood is provided with a groove, the groove is used for limiting the lower part of the fan box, and the groove and / or the cover wall and the lower part of the fan box are provided with the sealing structure.

10. The range hood according to claim 9, characterized in that, the groove has an oil leakage structure, the oil leakage structure is used for guiding the oil stain in the gap between the groove and the fan box into the inside of the inlet hood.

11. The range hood according to claim 4, characterized in that, the lower part of the fan box comprises the lower part of the vertical side plate of the fan box, or a flange extending inwardly or outwardly connected with the vertical side plate of the fan box, or a bent part formed by first extending inwardly and then bending downwardly connected with the vertical side plate of the fan box.

12. The range hood according to claim 11, characterized in that, The sealing structure is arranged between the lower part of the vertical side plate of the fan case and the smoke inlet cover, or arranged between the bending part and the smoke inlet cover, or arranged between the flange and the smoke inlet cover.

13. The range hood according to claim 4 or 6 or 9, wherein The cover wall of the smoke inlet cover and the fan case are provided with mounting holes at the relative positions for connecting the cover wall and the fan case.

14. The range hood according to claim 3, wherein The smoke inlet cover is connected to the inner side of the fan case and is at least partially shielded by the fan case.

15. The range hood according to claim 14, wherein The size of the at least part of the fan case shielding the smoke inlet cover in the height direction is between 10 mm and 500 mm.

16. The range hood according to claim 14, wherein The cover wall of the smoke inlet cover and the fan case are provided with mounting holes at the relative positions for connecting the cover wall and the fan case.

17. The range hood according to claim 14, wherein The lower part of the fan case includes the lower part of the vertical side plate of the fan case, or a flange extending inwardly connected to the vertical side plate of the fan case, or a bending part extending inwardly and then bending downwardly connected to the vertical side plate of the fan case, or a bending part extending inwardly and then bending upwardly connected to the vertical side plate of the fan case, or a bending part extending inwardly, bending upwardly and then bending inwardly connected to the vertical side plate of the fan case.

18. The range hood according to claim 17, wherein The sealing structure is arranged between the lower part of the vertical side plate of the fan case and the smoke inlet cover, or arranged between the bending part and the smoke inlet cover, or arranged between the flange and the smoke inlet cover.

19. The range hood according to claim 3, wherein The upper part of the smoke inlet cover has a first flange extending outwardly or inwardly, and the lower part of the fan case has a second flange extending outwardly or inwardly, and the first flange and the second flange are connected and sealed.

20. The range hood according to claim 2, wherein The cover wall of the smoke inlet cover and the fan case are provided with mounting holes at the relative positions for connecting the cover wall and the fan case, and the connecting positions include the positions of the mounting holes.

21. The hood as claimed in claim 20 wherein, The front side plate of the fan case is asymmetrically provided with a plurality of first mounting holes, the rear side plate of the fan case is asymmetrically provided with a plurality of second mounting holes, the plurality of first mounting holes coincide with the positions of the plurality of second mounting holes after rotating 180° around the vertical center line; and / or the left side plate of the fan case is asymmetrically provided with a plurality of third mounting holes, the right side plate of the fan case is asymmetrically provided with a plurality of fourth mounting holes, the plurality of third mounting holes coincide with the plurality of fourth mounting holes after rotating 180° around the vertical center line.

22. The range hood according to claim 1, wherein The lower part of the smoke inlet cover has a first adapter part for connecting a second adapter part of the upper part of the smoke pipe.

23. The range hood according to claim 22, characterized in that, The inner part of the first adapter part and the inner part of the part of the smoke inlet cover above the first adapter part form an air inlet flow channel, through which the smoke in the smoke pipe can flow into the fan box.

24. The range hood according to claim 22, characterized in that, The first adapter part is inserted into the second adapter part, and the outer surface of the first adapter part and the inner surface of the second adapter part are in non-detachable fixed sealing connection or detachable sealing connection, or the second adapter part is inserted into the first adapter part, and the inner surface of the first adapter part and the outer surface of the second adapter part are in non-detachable fixed sealing connection or detachable sealing connection, or the first adapter part and the second adapter part are integrally formed.

25. The range hood according to claim 22, characterized in that, The smoke inlet cover further comprises an expansion part, which is located downstream of the first adapter part in the direction of the flow of the smoke.

26. The range hood according to claim 25, characterized in that, The expansion part and the fan box are connected at the connection part and are sealingly fitted with the lower part of the fan box through a sealing structure.

27. The range hood according to claim 25, characterized in that, The expansion part covers the outer side of the fan box, or, The expansion part extends into the inner side of the fan box, or, The upper end of the expansion part and the lower end of the fan box are in abutment, or, The expansion part at least covers at least part of the fan.

28. The range hood according to claim 26, characterized in that, The expansion part and the first adapter part further have a connecting part therebetween, which comprises a platform part or a gradually expanding part.

29. The range hood according to claim 28, characterized in that, The upper part of the first adapter part is outwardly folded and extended to form the platform part, and the outer edge of the platform part is folded and extended upward to form the expansion part, or the upper part of the first adapter part is outwardly and upwardly extended to form the gradually expanding part, and the outer edge of the gradually expanding part is folded and extended upward to form the expansion part.

30. The range hood according to claim 28, characterized in that, The connection part between the expansion part and the connecting part has a guide angle, which is located below the side of the air inlet of the volute of the fan.

31. The range hood according to claim 1, characterized in that, The smoke inlet cover is a plastic smoke inlet cover or a metal smoke inlet cover.

32. The range hood according to claim 1, characterized in that, The smoke inlet cover has an oil leakage structure for guiding the oil stains in the gap between the smoke inlet cover and the fan box into the inner part of the smoke inlet cover.

33. The range hood according to claim 1, characterized in that, At least part of the smoke inlet cover shields at least part of the fan.

34. The range hood according to claim 1, characterized in that, The smoke inlet cover comprises a front cover wall which covers and is sealingly connected to at least part of the front side plate of the fan box.

35. The range hood according to claim 34, wherein, The smoke inlet cover further comprises a left cover wall which covers and is sealingly connected to at least part of the left side plate of the fan box, and a right cover wall which covers and is sealingly connected to at least part of the right side plate of the fan box.

36. The range hood according to claim 35, wherein, The smoke inlet cover further comprises a rear cover wall which covers and is sealingly connected to at least part of the rear side plate of the fan box.

37. The range hood according to claim 1 or 33, wherein, The center line of the impeller of the fan is perpendicular to the vertical wall surface, or the angle between the center line of the impeller of the fan and the vertical wall surface is greater than or equal to 45° and less than 90°.

38. The range hood according to claim 37, wherein, The smoke inlet cover covers at least part of the area of the fan below the inlet of the volute.

39. The range hood according to claim 38, wherein, The highest position of the projection of the smoke inlet cover towards the volute of the fan is close to or located at the lower edge of the inlet of the volute.

40. The range hood according to claim 37, wherein, The smoke inlet cover covers at least part of the inlet of the volute of the fan.

41. The range hood according to claim 40, wherein, The overlapping area of the projection of the smoke inlet cover towards the inlet of the volute of the fan and the inlet of the volute is greater than or equal to or less than 1 / 2 of the area of the inlet of the volute.

42. The range hood according to claim 1 or 33, wherein, The center line of the impeller of the fan is parallel to the wall surface, or the angle between the center line of the impeller of the fan and the wall surface is greater than 0° and less than 45°.

43. The range hood according to claim 42, wherein, The projection of the smoke inlet cover towards the volute of the fan is at least above the inlet of the volute of the fan.

44. The range hood according to claim 43, wherein, The projection of the smoke inlet cover towards the volute of the fan at least coincides with the impeller of the fan.

45. The range hood according to claim 1 or 33, wherein, In the height direction, the lower part of the volute of the fan protrudes out of the fan box.

46. The range hood according to claim 45, wherein, The height difference between the lowest position of the lower part of the volute and the lowest position of the fan box is greater than or equal to 15 mm and / or less than or equal to 220 mm.

47. The range hood according to claim 45, wherein, The ratio of the height difference between the lowest position of the lower part of the volute and the lowest position of the fan box to the total height of the volute is greater than or equal to 4% and / or less than or equal to 60%.

48. The range hood according to claim 45, wherein, The height of one of the front side plate, the rear side plate, the left side plate and the right side plate of the fan box is not greater than 385 mm.

49. The range hood of claim 45, wherein, The lowest position of the fan box is above, at or below the lowest position of the inlet of the volute of the fan.

50. The range hood of claim 49, wherein, The lowest position of the fan box is at or below the lowest position of the inlet of the volute of the fan, and a noise reduction structure is arranged on the inner surface of the fan box and opposite to the inlet of the volute of the fan.

51. The range hood of claim 50, wherein, The noise reduction structure comprises a noise reduction layer and a fixing mechanism for fixing the noise reduction layer on the inner surface of the fan box.

52. The range hood of claim 51, wherein, The surface of the fixing mechanism has a non-microporous openwork structure.

53. The range hood of claim 1 or 34, wherein, In the height direction, the bottom of the fan box is below or flush with the bottom of the volute of the fan.

54. The range hood of claim 1 or 33, wherein, The range hood further comprises a smoke outlet seat arranged above the ceiling; The fan box comprises first and second side plates arranged opposite to each other, and the upper portion of the first side plate has a fan box outlet; The mounting portion of the smoke outlet seat is located on the inner side of the upper portion of the first side plate or the mounting portion of the smoke outlet seat is located on the outer side of the upper portion of the first side plate; The smoke outlet of the volute of the fan communicates with the smoke outlet seat; The upper portion of the first side plate is inclined upward from the lower portion of the first side plate to the second side plate, and the upper portion of the first side plate and the lower portion of the first side plate have a non-zero included angle.

55. The range hood of claim 54, wherein, The fan box is mounted on or close to the top wall.

56. The range hood of claim 55, wherein, The height difference between the top of the fan box and the top wall is not greater than 90 mm.

57. The range hood of claim 55, wherein, The smoke outlet seat extends downward as a whole in a direction away from the fan box, or the smoke outlet seat extends horizontally as a whole in a direction away from the fan box, or the smoke outlet seat extends upward as a whole in a direction away from the fan box, and the highest point of the smoke outlet seat is not higher than the top of the fan box, or the smoke outlet seat extends upward as a whole in a direction away from the fan box, and the height difference between the highest point of the smoke outlet seat and the top of the fan box is not greater than the height difference between the top wall and the top of the fan box.

58. The range hood of claim 57, wherein, The smoke outlet seat extends integrally horizontally in a direction away from the fan case, has a flue gas inlet end and a flue gas outlet end, and the flue gas outlet end is vertically arranged or obliquely arranged as a whole, and the flue gas inlet end is obliquely arranged from bottom to top in a direction away from the flue gas outlet end.

59. The range hood according to claim 57, wherein, The smoke outlet seat extends integrally horizontally in a direction away from the fan case, has a flue gas inlet end and a flue gas outlet end, and the flue gas outlet end is vertically arranged or obliquely arranged as a whole, and the flue gas inlet end is obliquely arranged from bottom to top in a direction away from the flue gas outlet end.

60. The range hood according to claim 57, wherein, The smoke outlet seat extends integrally horizontally in a direction away from the fan case, has a flue gas inlet end and a flue gas outlet end, and the flue gas outlet end is vertically arranged or obliquely arranged as a whole, and the flue gas inlet end is obliquely arranged from bottom to top in a direction away from the flue gas outlet end.

61. The range hood according to claim 57, wherein, The plane where the mounting portion of the smoke outlet seat is located is parallel to the plane where the fan case outlet of the upper portion of the first side plate is located.

62. The range hood according to claim 57, wherein, The included angle between the plane where the upper portion of the first side plate is located and the vertical direction is less than 14.9°, or greater than 15.1° and less than or equal to 75°, or equal to 15°.

63. The range hood according to claim 57, wherein, The proportion of the length of the upper portion of the first side plate to the total length of the first side plate is greater than or equal to a preset proportion, and the preset proportion is not less than 40% to 90%.

64. The range hood according to claim 57, wherein, The height of the upper portion of the first side plate in the vertical direction is less than or equal to 300 millimeters.

65. The hood as claimed in claim 1 or 33, wherein, The range hood further comprises a decorative cover, and the maximum cross section of the smoke inlet cover is projected downward to fall within the outlet of the lower cavity, so that the decorative cover can cover the air outlet of the lower cavity and the smoke inlet cover.

66. The hood as claimed in claim 1, wherein, The fan case has a fan case inlet for guiding flue gas, and the center line of the fan case inlet is perpendicular to the axis of the impeller of the fan.

67. The hood as claimed in claim 1 wherein, The first dimension of the fan case along the left-right direction is between 100 millimeters and 450 millimeters, and the second dimension of the fan case along the front-rear direction is between 100 millimeters and 450 millimeters.

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