A range hood

Abstract

The application relates to the technical field of kitchen appliances, and discloses a range hood. The range hood comprises a fan assembly and a pipeline assembly, the fan assembly comprises a machine box and a fan arranged in the machine box, an air inlet of the machine box is arranged on the machine box, the pipeline assembly is connected with the machine box, an inner cavity of the pipeline assembly is communicated with the air inlet of the machine box, a flow guide outer expansion structure is arranged at the connecting position of the pipeline assembly and the machine box, the area of the flow guide outer expansion structure is adjustable, and the angle of the flow guide outer expansion structure relative to a horizontal plane is adjustable. The range hood provided by the application has the advantages that the airflow turning angle is large, the flow loss is reduced, the tail edge separation vortex is weakened, the effective flow area is increased, the performance of the fan can be further improved, the flow guide outer expansion structure can be adjusted according to different airflow flow states, the flow guide outer expansion structure is matched with the performance of the fan, the performance of the fan is maximally exerted, and the adaptability to the flow working condition is further improved.

Description

Technical Field

[0001] This invention 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 absorb cooking fumes and harmful substances produced during cooking, thus purifying the kitchen. Range hoods use a fan to circulate air, thereby removing the cooking fumes.

[0003] Some existing range hoods place the fan housing between the ceiling and the floor slab. The housing is connected to the smoke collection system via a duct assembly. The connection between the duct assembly and the housing uses an outward-expanding structure to increase the airflow space and reduce resistance. However, the area, starting point, and inclination of the existing outward-expanding structure are fixed, which cannot maximize the performance of different fan models. Summary of the Invention

[0004] Based on the above problems, the purpose of this invention is to provide a range hood in which the connection between the duct assembly and the casing is adjustable, thereby maximizing the performance of the fan.

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

[0006] A range hood, comprising:

[0007] A fan assembly includes a chassis and a fan disposed within the chassis, wherein the chassis is provided with a chassis air inlet;

[0008] A piping assembly is connected to the chassis. The inner cavity of the piping assembly is connected to the air inlet of the chassis. A flow-guiding expansion structure is provided at the connection between the piping assembly and the chassis. The area of ​​the flow-guiding expansion structure is adjustable, and the angle of the flow-guiding expansion structure relative to the horizontal plane is adjustable.

[0009] As an optional embodiment of the range hood of the present invention, the airflow expansion structure includes a first movable plate, a first expansion plate, a second expansion plate, and a second movable plate. The first movable plate is movably disposed within the casing. The first expansion plate is rotatably connected to the first movable plate. The first expansion plate is slidably engaged with the second expansion plate. The second expansion plate is rotatably connected to the second movable plate. The second movable plate is movably disposed within the pipe assembly.

[0010] As an optional embodiment of the range hood of the present invention, a first driving component is provided inside the casing, the first driving component is used to drive the first moving plate to move, and a second driving component is provided inside the pipe assembly, the second driving component is used to drive the second moving plate to move.

[0011] As an optional embodiment of the range hood of the present invention, the first driving assembly includes a first motor, a first lead screw, and a first nut. The first motor is used to drive the first lead screw to rotate. The first lead screw is threadedly engaged with the first nut, and the first nut is disposed on the first movable plate. The second driving assembly includes a second motor, a second lead screw, and a second nut. The second motor is used to drive the second lead screw to rotate. The second lead screw is threadedly engaged with the second nut, and the second nut is disposed on the second movable plate.

[0012] As an optional embodiment of the range hood of the present invention, a first slide rail is provided inside the casing, and the first movable plate is slidably engaged with the first slide rail; a second slide rail is provided inside the pipe assembly, and the second movable plate is slidably engaged with the second slide rail.

[0013] As an optional embodiment of the range hood of the present invention, the first movable plate is provided with a first hinge hole, the first outer expansion plate is provided with a second hinge hole, and the first hinge shaft passes through the first hinge hole and the second hinge hole; the second outer expansion plate is provided with a third hinge hole, the second movable plate is provided with a fourth hinge hole, and the second hinge shaft passes through the third hinge hole and the fourth hinge hole.

[0014] As an optional embodiment of the range hood of the present invention, a third slide rail is provided on the first outer expansion plate, and the second outer expansion plate is slidably engaged with the third slide rail; and / or, a fourth slide rail is provided on the second outer expansion plate, and the first outer expansion plate is slidably engaged with the fourth slide rail.

[0015] As an optional embodiment of the range hood of the present invention, the pipe assembly is provided with a clearance space for avoiding the outward expansion structure of the flow guide.

[0016] As an optional embodiment of the range hood of the present invention, the fan is inclinedly arranged inside the casing, and the angle between the fan and the horizontal plane is θ, where 2°≤θ≤10°.

[0017] As an optional embodiment of the range hood of the present invention, it further includes a smoke collection assembly, which is connected to the fan assembly through the pipe assembly.

[0018] The beneficial effects of this invention are as follows:

[0019] The range hood provided by this invention features an outward-expanding structure at the connection between the duct assembly and the casing. This increases the airflow turning angle, reduces flow loss, weakens trailing edge separation vortices, and increases the effective flow area, thereby further improving the performance of the fan. Since the area and angle of the outward-expanding structure relative to the horizontal plane are adjustable, the structure can be adjusted for different airflow conditions, ensuring that it matches the fan's performance and maximizing its effectiveness, thus further enhancing its adaptability to various flow conditions. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of the present invention and these drawings without creative effort.

[0021] Figure 1 This is a structural schematic diagram of the range hood, wall, kitchen ceiling, suspended ceiling panel, and cabinet provided in a specific embodiment of the present invention;

[0022] Figure 2 This is a schematic diagram of the structure of the fan assembly in the range hood provided in a specific embodiment of the present invention;

[0023] Figure 3 This is an exploded view of the fan assembly in a range hood provided in a specific embodiment of the present invention;

[0024] Figure 4 This is a schematic diagram of the casing of the range hood provided in a specific embodiment of the present invention;

[0025] Figure 5 This is a cross-sectional schematic diagram of the volute and casing of a range hood provided in a specific embodiment of the present invention;

[0026] Figure 6 This is a schematic diagram of the structure of the fan in the range hood provided in a specific embodiment of the present invention;

[0027] Figure 7 This is a bottom view of the fan in a range hood provided in a specific embodiment of the present invention;

[0028] Figure 8 This is a structural schematic diagram of the fan, casing, and wall in a range hood provided in a specific embodiment of the present invention;

[0029] Figure 9 This is a schematic diagram of the structure of the volute, oil guiding channel and pipeline assembly in the range hood provided in a specific embodiment of the present invention;

[0030] Figure 10 This is a schematic diagram of the structure of the range hood provided in a specific embodiment of the present invention;

[0031] Figure 11 This is a cross-sectional schematic diagram of a partial structure, wall, kitchen ceiling, suspended ceiling and cabinet of the range hood provided in a specific embodiment of the present invention;

[0032] Figure 12 This is a schematic diagram of the structure of the casing and piping assembly in the range hood provided in a specific embodiment of the present invention;

[0033] Figure 13 This is a schematic diagram of the structure of the casing and piping assembly (without the external expansion structure) in the range hood provided in a specific embodiment of the present invention;

[0034] Figure 14 This is a schematic diagram of the structure of the casing and piping assembly (with an outward expansion structure) in the range hood provided in a specific embodiment of the present invention;

[0035] Figure 15 This is a structural schematic diagram of the casing and piping assembly (with an outward flow-guiding structure and an airfoil guide plate) in a range hood provided by a specific embodiment of the present invention;

[0036] Figure 16 This is a schematic diagram of the airfoil guide plate in a range hood provided in a specific embodiment of the present invention;

[0037] Figure 17 This is a schematic diagram of the casing and the external airflow expansion structure in the range hood provided in a specific embodiment of the present invention;

[0038] Figure 18 This is a cross-sectional schematic diagram of the casing and the external airflow expansion structure (in the first position) of the range hood provided in a specific embodiment of the present invention;

[0039] Figure 19 This is a cross-sectional schematic diagram of the casing and the external airflow expansion structure (in the second position) in the range hood provided in a specific embodiment of the present invention;

[0040] Figure 20 This is a cross-sectional schematic diagram of the casing and the external airflow expansion structure (located in the third position) in a range hood provided by a specific embodiment of the present invention;

[0041] Figure 21 This is a schematic diagram of the structure of the first motor and the first lead screw in the range hood provided in a specific embodiment of the present invention;

[0042] Figure 22 This is a schematic diagram of the structure of the first movable plate in the range hood provided in a specific embodiment of the present invention;

[0043] Figure 23 This is a schematic diagram of the structure of the first outer expansion plate in the range hood provided in a specific embodiment of the present invention;

[0044] Figure 24 This is a schematic diagram of the structure of the second outer expansion plate in the range hood provided in a specific embodiment of the present invention;

[0045] Figure 25 This is a schematic diagram of the structure of the range hood housing with a first slide rail provided in a specific embodiment of the present invention;

[0046] Figure 26 This is a schematic diagram of the structure of a pipe assembly with clearance space in a range hood provided in a specific embodiment of the present invention;

[0047] Figure 27 This is a structural schematic diagram of the housing and piping assembly in a range hood provided in a specific embodiment of the present invention;

[0048] Figure 28 This is a structural schematic diagram of the housing, fan, and piping assembly in a range hood provided in a specific embodiment of the present invention;

[0049] Figure 29 This is a schematic diagram of the structure of the first fixed bracket in the range hood provided in a specific embodiment of the present invention;

[0050] Figure 30 This is a schematic diagram of the structure of the third fixed bracket in the range hood provided in a specific embodiment of the present invention;

[0051] Figure 31 This is a front view schematic diagram of the third fixed bracket in the range hood provided in a specific embodiment of the present invention.

[0052] In the picture:

[0053] 1. Fan assembly; 2. Piping assembly; 3. Smoke collection assembly;

[0054] 11. Chassis; 12. Fan; 13. Check valve;

[0055] 111. Cabinet; 112. End cap; 113. Cabinet air inlet; 114. Cabinet air outlet; 115. First noise reduction plate; 1151. First sound absorption hole; 116. Second noise reduction plate; 1161. Second sound absorption hole; 117. Third noise reduction plate; 1171. Third sound absorption hole; 118. First slide rail; 119. Oil guide channel;

[0056] 1191. Oil receiving section; 1192. Clearance section; 1193. Oil outlet section;

[0057] 121. Volute; 122. Impeller; 123. Fan inlet; 124. Fan outlet; 125. Oil drain hole; 126. First fixed bracket; 127. Second fixed bracket; 128. Third fixed bracket;

[0058] 1261. First curved flange; 1262. Second curved flange;

[0059] 1281. First bevel flange; 1282. Second bevel flange;

[0060] 21. Upper connecting pipe; 22. Lower connecting pipe; 23. Noise reduction expansion structure; 24. Flow guide expansion structure; 25. Airfoil guide vane; 26. Mounting plate; 27. Fourth noise reduction plate; 271. Fourth sound absorption hole; 28. Second slide rail; 29. ​​Clearance space;

[0061] 241. First movable plate; 2411. First hinge hole; 242. First expansion plate; 2421. Second hinge hole; 243. Second expansion plate; 2431. Third hinge hole; 2432. Fourth slide rail; 244. Second movable plate; 245. First drive assembly; 246. Second drive assembly;

[0062] 2451. First motor; 2452. First lead screw; 2453. First nut;

[0063] 251. Leading edge of the airfoil; 252. Trailing edge of the airfoil; 253. Highest point of the airfoil; 254. Noise reduction hole;

[0064] 31. Smoke collection chamber; 32. Oil cup;

[0065] 100. Walls; 200. Kitchen ceiling; 300. Ceiling panel; 400. Cabinets. Detailed Implementation

[0066] To make the technical problems solved by the present invention, the technical solutions adopted, and the technical effects achieved clearer, the technical solutions of the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0067] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The terms "first position" and "second position" refer to two different positions.

[0068] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections or detachable connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances.

[0069] like Figures 1 to 31 As shown, this embodiment provides a range hood, which includes a fan assembly 1 and a duct assembly 2. The fan assembly 1 is disposed between the kitchen ceiling 200 and the suspended ceiling 300, and the duct assembly 2 passes through the cabinet 400. The fan assembly 1 includes a housing 11 and a fan 12 inclinedly disposed within the housing 11. The housing 11 is provided with a housing air inlet 113, which is used to fix and install the duct assembly 2. The duct assembly 2 is connected to the housing 11, and the inner cavity of the duct assembly 2 communicates with the housing air inlet 113. At the connection between the duct assembly 2 and the housing 11, a noise reduction outward expansion structure 23 near the wall 100 and an airflow guiding outward expansion structure 24 away from the wall 100 are provided.

[0070] The fan 12 lies obliquely in the upper part of the housing 11 for easy air intake. The fan 12 has an air inlet 123 that connects to the housing air inlet 113. Due to the fan 12's tilt, the wide flow channel area of ​​the air inlet 123 is further away from the housing air inlet 113, which facilitates airflow and ensures sufficient flow space. Both the fan inlet 123 and the housing air inlet 113 are positioned close to the wall 100 to maximize the overlap between the projection of the fan inlet 123 on the horizontal plane and the housing air inlet 113.

[0071] The noise reduction expansion structure 23 expands outward toward the wall 100. The noise direction reflected by the noise reduction expansion structure 23 has a certain phase angle with the noise direction of the fan 12, thus canceling out some of the noise energy. The airflow guiding expansion structure 24 expands outward toward the interior space of the kitchen. The starting point of the airflow guiding expansion structure 24 forms a line connecting the outer edge of the cabinet 400. The starting point of the airflow guiding expansion structure 24 forms a line connecting the intersection of the rotating shaft of the fan 12 and the air inlet 123 of the fan. The airflow guiding expansion structure 24 is located within the range between the first and second lines. The height of the starting point of the airflow guiding expansion structure 24 is h, 30mm≤h≤200mm, thus making full use of the internal top side space of the cabinet 400 without affecting the overall storage space of the cabinet 400.

[0072] like Figure 13 As shown, without the external airflow guiding structure 24, the airflow forms a strong separation vortex at the connection between the casing 11 and the piping assembly 2, compressing the effective airflow area and causing poor air intake for the fan 12, making it difficult to improve performance. Figure 14 As shown, with the addition of the flow-guiding expansion structure 24, the airflow turning angle increases, flow loss decreases, trailing edge separation vortex weakens, and the effective flow area increases, which can further improve the performance of the fan 12. Experimental test data show that compared with a right-angle turn, the airflow expansion structure 24 significantly improves all aerodynamic parameters, while significantly reducing noise.

[0073] Optionally, the inner surface of the flow-guiding expansion structure 24 is provided with an airfoil guide plate 25. The airfoil guide plate 25 has an airfoil leading edge 251 and an airfoil trailing edge 252. The airfoil leading edge 251 is obliquely downward and faces the airflow direction, while the airfoil trailing edge 252 is obliquely upward and faces away from the airflow direction. The airfoil guide plate 25 utilizes the Coanda effect to suppress flow separation and ensure smooth airflow. The Coanda effect is also known as the wall adhesion effect or the Coanda effect. It refers to the tendency of a fluid (water flow or air flow) to deviate from its original flow direction and instead flow along a convex surface. When there is surface friction between the fluid and the surface of the object it flows over (which can also be described as fluid viscosity), as long as the curvature is not large, the fluid will flow along the surface of the object.

[0074] Optionally, the airfoil deflector 25 has an airfoil apex 253, and the distance between the airfoil apex 253 and the airfoil trailing edge 252 is less than the distance between the airfoil apex 253 and the airfoil leading edge 251. With this configuration, the airfoil deflector 25 has lower drag, is less prone to secondary separation, and has weaker airflow impact, thereby better reducing airflow impact noise.

[0075] Optionally, the airfoil guide vane 25 is provided with a number of noise reduction holes 254 to absorb the noise radiated by the fan 12 and reduce the noise energy transmitted to the pipeline assembly 2.

[0076] Optionally, the airfoil guide vane 25 is a laminar flow airfoil. The leading edge 251 of the laminar flow airfoil has a gentle curvature without abrupt changes or lines with large curvature. The highest point 253 of the airfoil is closer to the trailing edge 252. The drag of the laminar flow airfoil is relatively small compared to other airfoils, making it less prone to secondary separation and reducing airflow impact. This better reduces airflow impact noise and compresses the low-speed separation zone in the wake region. The specific parameters of the laminar flow airfoil belong to the field of airfoil selection and will not be elaborated here.

[0077] To avoid affecting the airflow within the duct assembly 2, the airfoil leading edge 251 may optionally coincide with the outward expansion starting point of the guide expansion structure 24.

[0078] Optionally, sound-absorbing material is filled between the airfoil deflector 25 and the outward expansion structure 24 to absorb noise radiated by the fan 12 and reduce the noise energy transmitted to the pipeline assembly 2. Sound-absorbing materials are mostly loose and porous, such as slag wool or blankets. Their sound absorption mechanism involves sound waves penetrating deep into the pores of the material, which are mostly interconnected open pores. This is subject to friction and viscous resistance from air molecules, as well as mechanical vibration of the fine fibers, thereby converting sound energy into heat energy.

[0079] To facilitate the fixed installation of the airfoil deflector 25, optionally, a mounting plate 26 is provided on the inner side of the airflow expansion structure 24, and the airfoil deflector 25 is fixedly connected to the mounting plate 26. There can be two mounting plates 26, which can be located on both sides of the airfoil deflector 25 respectively. The airfoil deflector 25 and the mounting plate 26 can be connected by bolts to achieve a detachable connection, which facilitates disassembly, assembly, maintenance and repair.

[0080] In some embodiments, the airfoil deflector 25 and the deflector expansion structure 24 can also be integrally formed, which facilitates mass production.

[0081] Optionally, a first noise reduction plate 115 is provided on the inner bottom of the chassis 11. The first noise reduction plate 115 has a plurality of first sound absorption holes 1151, which are used to absorb and reduce the noise transmitted downward from the fan inlet 123. Sound-absorbing material can also be filled between the first noise reduction plate 115 and the chassis 11 to further reduce noise.

[0082] Optionally, a second noise reduction plate 116 is provided on the inner side of both the front and rear side walls of the chassis 11. The second noise reduction plate 116 is provided with a plurality of second sound-absorbing holes 1161 for absorbing and reducing the noise energy radiated by the fan 12. Sound-absorbing material can also be filled between the second noise reduction plate 116 and the chassis 11 to further reduce noise.

[0083] Optionally, an air outlet 114 is provided on the left side wall of the chassis 11. The air outlet 114 is located on the left or right side of the chassis 11, and the specific location is determined according to the structural dimensions of the fan 12. A third noise reduction plate 117 is provided on the inner side of the right side wall of the chassis 11. The third noise reduction plate 117 is provided with several third sound absorption holes 1171 to further absorb and reduce the noise energy radiated by the fan 12. Sound-absorbing material can also be filled between the third noise reduction plate 117 and the chassis 11 to further reduce noise.

[0084] Optionally, a fourth noise reduction plate 27 is provided on the noise reduction expansion structure 23. The fourth noise reduction plate 27 is provided with a plurality of fourth sound-absorbing holes 271 for absorbing and reducing the noise transmitted from the fan 12 to the pipeline assembly 2. Sound-absorbing material can also be filled between the first noise reduction plate 115 and the noise reduction expansion structure 23 to further reduce noise.

[0085] To facilitate processing and manufacturing, the noise reduction expansion structure 23 may optionally be a planar structure, with the extension of the vertical line of the noise reduction expansion structure 23 passing through the fan inlet 123 of the fan 12.

[0086] In some embodiments, to enhance the premium look, the noise reduction expansion structure 23 can also be an arc-shaped structure, with the center of the noise reduction expansion structure 23 passing through the fan inlet 123 of the fan 12.

[0087] The flow-guiding expansion structure 24 can be a fixed structure or a movable structure. Optionally, the area of ​​the flow-guiding expansion structure 24 is adjustable, and the angle of the flow-guiding expansion structure 24 relative to the horizontal plane is adjustable. The flow-guiding expansion structure 24 can be adjusted for different airflow states to ensure that the flow-guiding expansion structure 24 matches the performance of the fan 12, maximize the performance of the fan 12, and further improve its adaptability to flow conditions.

[0088] Optionally, the flow-guiding expansion structure 24 includes a first movable plate 241, a first expansion plate 242, a second expansion plate 243, and a second movable plate 244. The first movable plate 241 is movably disposed within the housing 11. The first expansion plate 242 is rotatably connected to the first movable plate 241. The first expansion plate 242 is slidably engaged with the second expansion plate 243. The second expansion plate 243 is rotatably connected to the second movable plate 244. The second movable plate 244 is movably disposed within the pipeline assembly 2. Through the combination of movable and rotating joints, the area of ​​the flow-guiding expansion structure 24 is adjustable, as is the angle of the flow-guiding expansion structure 24 relative to the horizontal plane. The structure is simple and easy to control the structural changes of the flow-guiding expansion structure 24.

[0089] To achieve automated adjustment of the flow-guiding expansion structure 24, optionally, a first drive assembly 245 is provided inside the chassis 11 to drive the first moving plate 241 to move, and a second drive assembly 246 is provided inside the pipeline assembly 2 to drive the second moving plate 244 to move. In some embodiments, the flow-guiding expansion structure 24 can also be manually adjusted using a knob, push rod, or other structure.

[0090] Optionally, the first drive assembly 245 includes a first motor 2451, a first lead screw 2452, and a first nut 2453. The first motor 2451 drives the first lead screw 2452 to rotate. The first lead screw 2452 is threadedly engaged with the first nut 2453, which is mounted on the first movable plate 241. The second drive assembly 246 includes a second motor, a second lead screw, and a second nut. The second motor drives the second lead screw to rotate. The second lead screw is threadedly engaged with the second nut, which is mounted on the second movable plate 244. This lead screw and nut transmission method allows for precise stepless motion transmission and a self-locking function. It enables adjustment of the flow-guiding expansion structure 24 at any angle, any outlet size, and any expansion starting point height, ensuring the structural stability of the flow-guiding expansion structure 24.

[0091] Optionally, a first slide rail 118 is provided inside the chassis 11, and the first moving plate 241 is slidably engaged with the first slide rail 118. The first slide rail 118 can move horizontally, ensuring the stability of the horizontal movement of the first moving plate 241. A second slide rail 28 is provided inside the pipeline assembly 2, and the second moving plate 244 is slidably engaged with the second slide rail 28. The second slide rail 28 can move vertically, ensuring the stability of the vertical movement of the second moving plate 244.

[0092] To enable relative free rotation between the first movable plate 241 and the first extended plate 242, optionally, the first movable plate 241 is provided with a first hinge hole 2411, and the first extended plate 242 is provided with a second hinge hole 2421, with the first hinge shaft passing through the first hinge hole 2411 and the second hinge hole 2421; to enable relative free rotation between the second movable plate 244 and the second extended plate 243, the second extended plate 243 is provided with a third hinge hole 2431, and the second movable plate 244 is provided with a fourth hinge hole, with the second hinge shaft passing through the third hinge hole 2431 and the fourth hinge hole.

[0093] To prevent the first expansion plate 242 and the second expansion plate 243 from separating, optionally, the first expansion plate 242 is provided with a third slide rail, and the second expansion plate 243 is slidably engaged with the third slide rail; and / or, the second expansion plate 243 is provided with a fourth slide rail 2432, and the first expansion plate 242 is slidably engaged with the fourth slide rail 2432.

[0094] Optionally, the piping assembly 2 is provided with a clearance space 29 for avoiding the flow-guiding expansion structure 24. The size of the clearance space 29 is determined according to the maximum working space of the flow-guiding expansion structure 24 to avoid interfering with the movement and changes of the flow-guiding expansion structure 24.

[0095] Optionally, the fan 12 is provided with an oil drain hole 125, which is located on the downward-facing end face of the fan 12 and at the lowest point of liquid flow. An oil guide channel 119 is provided inside the casing 11, located below the fan 12, for guiding the filtered oil from the fan 12 into the pipeline assembly 2. The oil guide channel 119 includes a connected oil receiving section 1191, a clearance section 1192, and an oil outlet section 1193. The oil receiving section 1191 is located below the oil drain hole 125. The clearance section 1192 is close to or against the side wall of the casing 11 and surrounds the outer periphery of the casing's air inlet 113 to avoid affecting the airflow and to ensure that oil does not fall onto the first noise reduction plate 115 and corrode it. The oil outlet section 1193 extends into the casing's air inlet 113, thereby guiding the oil into the pipeline assembly 2.

[0096] To facilitate the collection of oil stains, the smoke collection assembly 3 may optionally include a smoke collection chamber 31 and an oil cup 32 disposed at the bottom of the smoke collection chamber 31, with the oil outlet section 1193 communicating with the oil cup 32.

[0097] To avoid affecting the airflow within the pipeline assembly 2, optionally, an oil inlet pipe is provided within the pipeline assembly 2, and the oil outlet section 1193 is connected to the oil cup 32 via the oil inlet pipe.

[0098] For ease of installation, the piping assembly 2 may optionally include an upper connecting pipe 21 and a lower connecting pipe 22. The upper connecting pipe 21 is inserted into the lower connecting pipe 22 from top to bottom. The upper connecting pipe 21 is connected to the chassis 11, and the air outlet of the upper connecting pipe 21 is connected to the air inlet 113 of the chassis. The lower connecting pipe 22 is connected to the smoke collection assembly 3, and the air inlet of the lower connecting pipe 22 is connected to the smoke collection chamber 31.

[0099] To prevent oil from overflowing from the oil guide channel 119, the oil guide channel 119 may optionally be formed by an upward-opening U-shaped groove plate.

[0100] To ensure a smooth transition and connection between the various parts of the oil guiding channel 119, the oil guiding channel 119 may optionally include a first transition section and a second transition section. The receiving section 1191 is connected to the avoidance section 1192 through the first transition section, and the avoidance section 1192 is connected to the outlet section 1193 through the second transition section. The first transition section and the second transition section may be rounded corners or chamfered corners.

[0101] For ease of processing and manufacturing, the oil receiving section 1191, the clearance section 1192, and the oil outlet section 1193 may be integrally formed.

[0102] Optionally, the heights of the oil receiving section 1191, the clearance section 1192, and the oil outlet section 1193 decrease sequentially. That is, from the oil receiving section 1191 to the oil outlet section 1193, the lowest point of the channel gradually decreases until it contacts the air inlet 113 of the chassis, showing a spiral downward trend, ensuring that the oil falling into the oil receiving end can flow smoothly into the pipeline system and then into the oil cup 32.

[0103] In some embodiments, the oil guide channel 119 may also be provided at the bottom of the chassis 11, thereby eliminating the need to install the oil guide channel 119 and preventing the oil guide channel 119 from shifting.

[0104] Optionally, the range hood also includes a smoke collection assembly 3, which is connected to the fan assembly 1 via a pipe assembly 2. The pipe assembly 2 has a certain gap with the wall 100 to prevent contact and vibration noise, and also facilitates the installation of the pipe assembly 2.

[0105] Optionally, the height of the casing 11 is T, where 200mm ≤ T ≤ 250mm. This height range satisfies the distance between the ceiling panel 300 and the kitchen ceiling 200 in most users' kitchens. The length and width of the casing 11 ensure that the edge of the fan 12 is tightly attached to the inner wall of the casing 11. The fan 12 is an ultra-thin fan, with a thickness t, where 0.45 ≤ t / T ≤ 0.65. This range ensures that when the fan 12 is located inside the casing 11, there is sufficient flow clearance between the fan inlet 123 and the inner wall of the casing 11. This ensures the performance of the fan 12 and also ensures that the fan assembly 1 can meet the distance between the ceiling panel 300 and the kitchen ceiling 200 in most users' kitchens. The fan 12 includes a volute 121 and an impeller 122 disposed within the volute 121. The maximum width of the volute 121 is B, where 410mm ≤ B ≤ 600mm, and the outer diameter of the impeller 122 is D, where 270mm ≤ D ≤ 400mm. Optionally, the number of blades in the impeller 122 is n, where 55 ≤ n ≤ 85. Due to the reduced thickness of the fan 12, it can be a single-inlet fan. To ensure the working area of ​​the impeller 122 and mitigate the negative impact of the thinner fan 12 on performance, both the outer diameter D and the number of blades n of the impeller 122 are larger than those used in conventional range hoods. Consequently, the maximum width B of the volute 121 of the fan 12 is also larger than that of a conventional fan, therefore the casing 11 needs to ensure sufficient space in the front-to-back direction.

[0106] Optionally, the angle between the fan 12 and the horizontal plane is θ, where 2°≤θ≤10°, to facilitate guiding the oil filtered by the fan 12 to a single point, where it falls into the oil guide channel 119 through the oil drain hole 125. The fan 12 is tilted at a certain angle, so the wide flow channel side area of ​​the fan inlet 123 is further away from the chassis inlet 113, which is beneficial for airflow at the fan inlet 123 and ensures sufficient flow space at the fan inlet 123.

[0107] To facilitate the placement and installation of the fan 12, the casing 11 can adopt a split structure. Optionally, the casing 11 includes a housing 111 and an end cover 112 disposed on the housing 111. The top of the housing 111 is open, and the end cover 112 is closed at the opening. The fan 12 is located inside the housing 111 and is fixedly connected to the end cover 112.

[0108] Optionally, the volute 121 is provided with a fan inlet 123 and a fan outlet 124. The bottom of the housing 111 is provided with a chassis inlet 113 communicating with the fan inlet 123, and the side wall of the housing 111 is provided with a chassis outlet 114 communicating with the fan outlet 124. The fan assembly 1 also includes a check valve 13, which is located at the fan outlet 124. The chassis outlet 114 is used for fixed installation and connecting the fan outlet 124 and the check valve 13. The check valve 13 is connected to the common flue inlet through a flue pipe to prevent exhaust smoke from flowing back into the fan 12.

[0109] To ensure sufficient installation space for fixing the piping assembly 2, optionally, the air inlet 113 is spaced apart from the front and rear side walls of the enclosure 111, with the distance between the air inlet 113 and the front side wall of the enclosure 111 being greater than the distance between the air inlet 113 and the rear side wall of the enclosure 111. This arrangement also avoids vibration and noise caused by the piping assembly 2 contacting the wall 100.

[0110] Since the fan 12 is placed at an angle, to ensure its stable operation, optionally, a first fixed bracket 126, a second fixed bracket 127, and a third fixed bracket 128 are provided on the fan 12. These three fixed brackets are respectively fixedly connected to the end cover 112. By fixing the fan 12 with the first fixed bracket 126, the second fixed bracket 127, and the third fixed bracket 128, the operational stability of the fan 12 is improved, and the vibration and noise of the fan 12 are reduced.

[0111] To prevent the fan 12 from shaking, the first fixed bracket 126 and the second fixed bracket 127 are optionally symmetrically arranged on both sides of the highest point of the fan 12 in the direction of inclination, and the third fixed bracket 128 is arranged at the lowest point of the fan 12 in the direction of inclination.

[0112] To prevent the first fixed bracket 126 and the second fixed bracket 127 from swaying relative to the volute 121, optionally, both the first fixed bracket 126 and the second fixed bracket 127 are provided with a first arc-shaped flange 1261 and a second arc-shaped flange 1262, which are respectively connected to the volute 121. Both the first fixed bracket 126 and the second fixed bracket 127 can be integrally U-shaped plates, reducing their own weight, ensuring sufficient contact area for fixed connection, and also giving them a certain degree of elastic deformation capacity to buffer the vibration of the fan 12. The top of the first fixed bracket 126 and the second fixed bracket 127 are respectively provided with threaded holes for inserting bolts for fixed installation.

[0113] To prevent the third fixed bracket 128 from swaying relative to the volute 121, optionally, the third fixed bracket 128 is provided with a first inclined flange 1281 and a second inclined flange 1282, which are respectively connected to the upper end face of the fan 12. The third fixed bracket 128 can be approximately Z-shaped, which reduces its own weight, ensures that the third fixed bracket 128 has sufficient contact area for fixed connection, and also gives the third fixed bracket 128 a certain elastic deformation capacity, thus buffering the vibration of the fan 12. The top of the third fixed bracket 128 is provided with threaded holes for bolts for fixing and installation.

[0114] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A range hood, characterized in that, include: The fan assembly (1) includes a chassis (11) and a fan (12) disposed in the chassis (11), wherein the chassis (11) is provided with a chassis air inlet (113). Piping assembly (2) is connected to the chassis (11). The inner cavity of the piping assembly (2) is connected to the air inlet (113) of the chassis. A flow-guiding expansion structure (24) is provided at the connection between the piping assembly (2) and the chassis (11). The area of ​​the flow-guiding expansion structure (24) is adjustable, and the angle of the flow-guiding expansion structure (24) relative to the horizontal plane is adjustable. The flow-guiding expansion structure (24) includes a first movable plate (241), a first expansion plate (242), a second expansion plate (243), and a second movable plate (244). The first movable plate (241) is movably disposed inside the chassis (11). The first expansion plate (242) is rotatably connected to the first movable plate (241). The first expansion plate (242) is slidably engaged with the second expansion plate (243). The second expansion plate (243) is rotatably connected to the second movable plate (244). The second movable plate (244) is movably disposed inside the pipeline assembly (2).

2. The range hood according to claim 1, characterized in that, The chassis (11) is provided with a first drive assembly (245) for driving the first moving plate (241) to move. The pipeline assembly (2) is provided with a second drive assembly (246) for driving the second moving plate (244) to move.

3. The range hood according to claim 2, characterized in that, The first drive assembly (245) includes a first motor (2451), a first lead screw (2452), and a first nut (2453). The first motor (2451) is used to drive the first lead screw (2452) to rotate. The first lead screw (2452) is threadedly engaged with the first nut (2453). The first nut (2453) is disposed on the first movable plate (241). The second drive assembly (246) includes a second motor, a second lead screw, and a second nut. The second motor is used to drive the second lead screw to rotate. The second lead screw is threadedly engaged with the second nut. The second nut is disposed on the second movable plate (244).

4. The range hood according to claim 1, characterized in that, The chassis (11) is provided with a first slide rail (118), and the first moving plate (241) slides in cooperation with the first slide rail (118); the pipeline assembly (2) is provided with a second slide rail (28), and the second moving plate (244) slides in cooperation with the second slide rail (28).

5. The range hood according to claim 1, characterized in that, The first movable plate (241) is provided with a first hinge hole (2411), the first outer expansion plate (242) is provided with a second hinge hole (2421), and the first hinge shaft passes through the first hinge hole (2411) and the second hinge hole (2421); the second outer expansion plate (243) is provided with a third hinge hole (2431), the second movable plate (244) is provided with a fourth hinge hole, and the second hinge shaft passes through the third hinge hole (2431) and the fourth hinge hole.

6. The range hood according to claim 1, characterized in that, The first expansion plate (242) is provided with a third slide rail, and the second expansion plate (243) is slidably engaged with the third slide rail; and / or, the second expansion plate (243) is provided with a fourth slide rail (2432), and the first expansion plate (242) is slidably engaged with the fourth slide rail (2432).

7. The range hood according to any one of claims 1-6, characterized in that, The pipeline assembly (2) is provided with a clearance space (29) for avoiding the flow-guiding expansion structure (24).

8. The range hood according to any one of claims 1-6, characterized in that, The fan (12) is inclined inside the casing (11), and the angle between the fan (12) and the horizontal plane is θ, where 2°≤θ≤10°.

9. The range hood according to any one of claims 1-6, characterized in that, It also includes a smoke collection assembly (3), which is connected to the fan assembly (1) through the pipeline assembly (2).

Images