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 outward expansion structure is arranged at the connecting position of the pipeline assembly and the machine box, an inner surface of the flow guide outward expansion structure is provided with an airfoil flow guide plate, the airfoil flow guide plate has an airfoil leading edge and an airfoil trailing edge, the airfoil leading edge is inclined downward and faces the airflow direction, and the airfoil trailing edge is inclined upward and deviates from the airflow direction. The range hood provided by the application applies the Coanda effect, the airflow deviates from the original flowing direction and flows along the surface of the airfoil flow guide plate, thereby inhibiting the flow separation effect, weakening the trailing edge separation vortex, increasing the effective flow area, making the airflow flow smoothly, and further improving the performance of the fan.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of kitchen appliances, in particular to a range hood. BACKGROUND

[0002] The range hood is worked by using the principle of fluid dynamics, and the oil fume is sucked and discharged by the fan installed in the range hood, and the filter screen is used to filter part of the oil particles. The fan includes a volute, an impeller installed in the volute, and a motor driving the impeller to rotate. When the impeller rotates, a negative pressure suction is generated at the center of the fan, and the oil fume below the range hood is sucked into the fan, and after being accelerated by the fan, it is collected and guided by the volute to be discharged outdoors.

[0003] Some existing range hoods place the machine case containing the fan between the ceiling and the floor, and the machine case is connected with the smoke collecting assembly through the pipeline assembly. The connection between the pipeline assembly and the machine case adopts a flow guide structure to guide the airflow of the air inlet, but airflow separation occurs at the trailing edge, which increases the aerodynamic noise and even hinders the airflow flow, affecting the further improvement of the performance. SUMMARY

[0004] Based on the above problems, the purpose of the present application is to provide a range hood which can inhibit the flow separation effect, weaken the trailing edge separation vortex, and make the airflow flow smoothly.

[0005] To achieve the above purpose, the present application adopts the following technical scheme:

[0006] A range hood comprises:

[0007] A fan assembly comprising a machine case and a fan arranged in the machine case, wherein the machine case is provided with a machine case air inlet;

[0008] A pipeline assembly connected with the machine case, wherein the inner cavity of the pipeline assembly is in communication with the machine case air inlet, and a flow guide outward expansion structure is arranged at the connection between the pipeline assembly and the machine case, and the inner surface of the flow guide outward expansion structure is provided with a wing type flow guide plate, the wing type flow guide plate has a wing type leading edge and a wing type trailing edge, the wing type leading edge is inclined downward and faces the airflow direction, and the wing type trailing edge is inclined upward and away from the airflow direction.

[0009] As an optional scheme of the range hood of the present application, the wing type flow guide plate has a wing type highest point, and the distance between the wing type highest point and the wing type trailing edge is less than the distance between the wing type highest point and the wing type leading edge.

[0010] As an optional scheme of the range hood of the present application, a plurality of noise reduction holes are arranged on the wing type flow guide plate.

[0011] As an optional scheme of the range hood of the present application, the shape of the wing type flow guide plate is a laminar flow airfoil.

[0012] As an optional scheme of the range hood of the present application, the wing-type leading edge coincides with the outward-expanding starting point of the flow guide outward-expanding structure.

[0013] As an optional scheme of the range hood of the present application, the wing-type flow guide plate and the flow guide outward-expanding structure are filled with sound-absorbing material.

[0014] As an optional scheme of the range hood of the present application, the inner side of the flow guide outward-expanding structure is provided with a mounting plate, and the wing-type flow guide plate is fixedly connected with the mounting plate.

[0015] As an optional scheme of the range hood of the present application, the wing-type flow guide plate and the flow guide outward-expanding structure are integrally formed.

[0016] As an optional scheme of the range hood of the present application, the fan is obliquely arranged in the cabinet, and the included angle between the fan and the horizontal plane is θ, 2°≤θ≤10°.

[0017] As an optional scheme of the range hood of the present application, the range hood further comprises a smoke collecting assembly connected with the fan assembly through the pipeline assembly.

[0018] The present application has the following beneficial effects:

[0019] The range hood provided by the present application is provided with the flow guide outward-expanding structure at the connection between the pipeline assembly and the cabinet, so that the airflow deflection angle is increased and the flow loss is reduced. Since the inner surface of the flow guide outward-expanding structure is provided with the wing-type flow guide plate, the wing-type flow guide plate has a wing-type leading edge and a wing-type trailing edge, the wing-type leading edge is inclined downward and faces the airflow direction, and the wing-type trailing edge is inclined upward and deviates from the airflow direction. The wing-type flow guide plate applies the Coanda effect, so that the airflow deviates from the original flow direction and tends to flow along the surface of the wing-type flow guide plate, thereby inhibiting the flow separation effect, weakening the trailing edge separation vortex, increasing the effective flow area, and making the airflow flow smoothly, so as to further improve the performance of the fan. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments of the present application will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor on the basis of the contents of the embodiments of the present application and the drawings.

[0021] Figure 1 is a structural schematic view of the range hood, wall, kitchen ceiling, suspended ceiling and cabinet provided by the present application;

[0022] Figure 2is a structural schematic diagram of a fan assembly in the range hood provided by the embodiment of the present application;

[0023] Figure 3 is an exploded schematic diagram of a fan assembly in the range hood provided by the embodiment of the present application;

[0024] Figure 4 is a structural schematic diagram of a machine box in the range hood provided by the embodiment of the present application;

[0025] Figure 5 is a sectional schematic diagram of a volute and a machine box in the range hood provided by the embodiment of the present application;

[0026] Figure 6 is a structural schematic diagram of a fan in the range hood provided by the embodiment of the present application;

[0027] Figure 7 is a bottom view schematic diagram of a fan in the range hood provided by the embodiment of the present application;

[0028] Figure 8 is a structural schematic diagram of a fan, a machine box and a wall in the range hood provided by the embodiment of the present application;

[0029] Figure 9 is a structural schematic diagram of a volute, an oil guiding passage and a pipeline assembly in the range hood provided by the embodiment of the present application;

[0030] Figure 10 is a structural schematic diagram of the range hood provided by the embodiment of the present application;

[0031] Figure 11 is a sectional schematic diagram of a partial structure, a wall, a kitchen roof, a ceiling board and a cabinet in the range hood provided by the embodiment of the present application;

[0032] Figure 12 is a structural schematic diagram of a machine box and a pipeline assembly in the range hood provided by the embodiment of the present application;

[0033] Figure 13 is a structural schematic diagram of a machine box and a pipeline assembly (without a flow guiding outer expansion structure) in the range hood provided by the embodiment of the present application;

[0034] Figure 14 is a structural schematic diagram of a machine box and a pipeline assembly (with a flow guiding outer expansion structure) in the range hood provided by the embodiment of the present application;

[0035] Figure 15 is a structural schematic diagram of a machine box and a pipeline assembly (with a flow guiding outer expansion structure and a wing-shaped flow guiding plate) in the range hood provided by the embodiment of the present application;

[0036] Figure 16 is a structural schematic diagram of a wing-shaped guide plate in an extractor hood provided by the embodiment of the present application;

[0037] Figure 17 is a structural schematic diagram of a machine box and a guide expansion structure in an extractor hood provided by the embodiment of the present application;

[0038] Figure 18 is a sectional view schematic diagram of a machine box and a guide expansion structure (in a first position) in an extractor hood provided by the embodiment of the present application;

[0039] Figure 19 is a sectional view schematic diagram of a machine box and a guide expansion structure (in a second position) in an extractor hood provided by the embodiment of the present application;

[0040] Figure 20 is a sectional view schematic diagram of a machine box and a guide expansion structure (in a third position) in an extractor hood provided by the embodiment of the present application;

[0041] Figure 21 is a structural schematic diagram of a first motor and a first lead screw in an extractor hood provided by the embodiment of the present application;

[0042] Figure 22 is a structural schematic diagram of a first moving plate in an extractor hood provided by the embodiment of the present application;

[0043] Figure 23 is a structural schematic diagram of a first expansion plate in an extractor hood provided by the embodiment of the present application;

[0044] Figure 24 is a structural schematic diagram of a second expansion plate in an extractor hood provided by the embodiment of the present application;

[0045] Figure 25 is a structural schematic diagram of a machine box provided with a first sliding rail in an extractor hood provided by the embodiment of the present application;

[0046] Figure 26 is a structural schematic diagram of a pipeline assembly provided with a avoiding space in an extractor hood provided by the embodiment of the present application;

[0047] Figure 27 is a structural schematic diagram of a machine box and a pipeline assembly in an extractor hood provided by the embodiment of the present application;

[0048] Figure 28 is a structural schematic diagram of a machine box, a fan and a pipeline assembly in an extractor hood provided by the embodiment of the present application;

[0049] Figure 29is a structural schematic view of a first fixed support in the range hood provided by the embodiment of the present application;

[0050] Figure 30 is a structural schematic view of a third fixed support in the range hood provided by the embodiment of the present application;

[0051] Figure 31 is a front view schematic view of the third fixed support in the range hood provided by the embodiment of the present application.

[0052] in the figure:

[0053] 1, fan assembly; 2, pipeline assembly; 3, smoke collection assembly;

[0054] 11, case; 12, fan; 13, check valve;

[0055] 111, box; 112, end cover; 113, case air inlet; 114, case air outlet; 115, first noise reduction plate; 1151, first sound absorbing hole; 116, second noise reduction plate; 1161, second sound absorbing hole; 117, third noise reduction plate; 1171, third sound absorbing hole; 118, first sliding rail; 119, oil guiding channel;

[0056] 1191, oil receiving section; 1192, avoiding section; 1193, oil outlet section;

[0057] 121, volute; 122, impeller; 123, fan air inlet; 124, fan air outlet; 125, oil leakage hole; 126, first fixed support; 127, second fixed support; 128, third fixed support;

[0058] 1261, first arc-shaped flange; 1262, second arc-shaped flange;

[0059] 1281, first inclined flange; 1282, second inclined flange;

[0060] 21, upper connecting pipe; 22, lower connecting pipe; 23, noise reduction outer expansion structure; 24, flow guiding outer expansion structure;

[0061] 25, wing-shaped flow guiding plate; 26, mounting plate; 27, fourth noise reduction plate; 271, fourth sound absorbing hole; 28, second sliding rail; 29, avoiding space;

[0062] 241, first moving plate; 2411, first hinged hole; 242, first outer expansion plate; 2421, second hinged hole; 243, second outer expansion plate; 2431, third hinged hole; 2432, fourth sliding rail; 244, second moving plate; 245, first driving assembly; 246, second driving assembly;

[0063] 2451 first motor; 2452 first screw rod; 2453 first nut;

[0064] 251 airfoil leading edge; 252 airfoil trailing edge; 253 airfoil highest point; 254 noise reduction hole;

[0065] 31 smoke collection cavity; 32 oil cup;

[0066] 100 wall; 200 kitchen top plate; 300 ceiling plate; 400 cabinet. DETAILED DESCRIPTION

[0067] In order to make the technical problems solved by the present application, the technical solutions adopted and the technical effects achieved more clear, the technical solutions of the embodiments of the present application will be further described in detail below with reference to the drawings. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0068] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance. Among them, the terms "first position" and "second position" are two different positions.

[0069] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixed connection, or it can be detachable connection; it can be mechanical connection, or it can be electrical connection; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0070] As Figures 1 to 31As shown, the present embodiment provides a range hood, which comprises a fan assembly 1 and a pipeline assembly 2, the fan assembly 1 is arranged between the kitchen ceiling 200 and the suspended ceiling 300, and the pipeline assembly 2 penetrates the cabinet 400. The fan assembly 1 comprises a machine box 11 and a fan 12 obliquely arranged in the machine box 11, and the machine box 11 is provided with a machine box air inlet 113 for fixedly mounting the pipeline assembly 2; the pipeline assembly 2 is connected with the machine box 11, the inner cavity of the pipeline assembly 2 is communicated with the machine box air inlet 113, and the connection between the pipeline assembly 2 and the machine box 11 is provided with a noise reduction outward expansion structure 23 close to the wall 100 and a flow guide outward expansion structure 24 away from the wall 100.

[0071] The fan 12 is obliquely horizontally arranged in the upper space of the machine box 11, which is convenient for air intake. The fan 12 is provided with a fan air inlet 123 communicated with the machine box air inlet 113. Since the fan 12 is inclined at an angle, the wide flow channel side area of the fan air inlet 123 is farther away from the machine box air inlet 113, which is conducive to the airflow flow of the fan air inlet 123 and ensures that the fan air inlet 123 has sufficient flow space. The fan air inlet 123 of the fan 12 and the machine box air inlet 113 are both arranged close to the wall 100, which ensures that the projection of the fan air inlet 123 on the horizontal plane overlaps the machine box air inlet 113 to the greatest extent.

[0072] The outward expansion direction of the noise reduction outward expansion structure 23 is towards the wall 100, the noise reflection direction of the noise reduction outward expansion structure 23 and the noise direction of the fan 12 have a certain phase angle, so as to offset part of the noise energy. The outward expansion direction of the flow guide outward expansion structure 24 is towards the interior space of the kitchen, the outward expansion starting point of the flow guide outward expansion structure 24 and the outer edge of the cabinet 400 form a first connecting line, the outward expansion starting point of the flow guide outward expansion structure 24 and the intersection of the rotating shaft of the fan 12 and the fan air inlet 123 form a second connecting line, the flow guide outward expansion structure 24 is located in the range between the first connecting line and the second connecting line, the height of the outward expansion starting point of the flow guide outward expansion structure 24 is h, 30mm≤h≤200mm, so as to fully utilize the internal top side space of the cabinet 400 without affecting the storage space of the whole cabinet 400.

[0073] As shown in the figure, Figure 13 If there is no flow guide outward expansion structure 24, the airflow forms a strong separation vortex at the connection between the machine box 11 and the pipeline assembly 2, which compresses the effective flow area of the airflow, causing poor air intake of the fan 12 and difficulty in improving the performance. Figure 14 As shown in the figure,

[0074] Optionally, the inner surface of the flow guiding outer expanding structure 24 is provided with an airfoil guide plate 25, which has an airfoil leading edge 251 and an airfoil trailing edge 252. The airfoil leading edge 251 is inclined downward and faces the airflow direction, and the airfoil trailing edge 252 is inclined upward and away from the airflow direction. The airfoil guide plate 25 applies the Coanda effect to suppress flow separation and make the airflow flow smoothly. The Coanda effect is also known as the wall attachment effect or Coandă effect. When there is surface friction between the fluid (water flow or air flow) and the object surface it flows through (or the fluid viscosity), as long as the curvature is not large, the fluid will flow along the object surface.

[0075] Optionally, the airfoil guide plate 25 has an airfoil highest point 253, which is closer to the airfoil trailing edge 252 than to the airfoil leading edge 251. In this way, the airfoil guide plate 25 has smaller resistance and is less likely to cause secondary separation, and the airflow impact is weak, thereby better reducing the airflow impact noise.

[0076] Optionally, the airfoil guide plate 25 is provided with a plurality of noise reduction holes 254 for absorbing the noise radiated by the fan 12 and reducing the noise energy transmitted to the pipeline assembly 2.

[0077] Optionally, the airfoil guide plate 25 has a laminar airfoil shape. The airfoil leading edge 251 of the laminar airfoil has a gentle curvature without abrupt changes or large curvature lines, and the airfoil highest point 253 is closer to the airfoil trailing edge 252. The laminar airfoil has smaller resistance than other airfoils, is less likely to cause secondary separation, and has weak airflow impact, thereby better reducing the airflow impact noise and compressing the low-speed separation zone of the wake region. The specific parameters of the laminar airfoil belong to the airfoil selection field and will not be described here.

[0078] To avoid affecting the airflow in the pipeline assembly 2, the airfoil leading edge 251 is optionally coincident with the outer expanding starting point of the flow guiding outer expanding structure 24.

[0079] Optionally, the airfoil guide plate 25 and the flow guiding outer expanding structure 24 are filled with sound-absorbing material, thereby absorbing the noise radiated by the fan 12 and reducing the noise energy transmitted to the pipeline assembly 2. The sound-absorbing material is mostly loose and porous, such as slag wool and blankets, and its sound absorption mechanism is that the sound wave penetrates into the pores of the material, and the pores are mostly open holes that are interconnected inside, which are subjected to air molecular friction and viscous resistance, and the fine fibers are mechanically vibrated, thereby converting sound energy into heat energy.

[0080] To facilitate the fixed installation of the airfoil guide vane 25, optionally, the inner side of the guide outer expansion structure 24 is provided with a mounting plate 26, and the airfoil guide vane 25 is fixedly connected with the mounting plate 26. The mounting plate 26 can be two, and the two mounting plates 26 can be located on the two sides of the airfoil guide vane 25 respectively. The airfoil guide vane 25 and the mounting plate 26 can be connected through bolts to realize detachable connection, facilitating disassembly, assembly, maintenance and repair.

[0081] In some embodiments, the airfoil guide vane 25 and the guide outer expansion structure 24 can also be integrally formed, facilitating batch processing and manufacturing.

[0082] Optionally, the bottom inner side of the case 11 is provided with a first noise reduction plate 115, and a plurality of first sound absorbing holes 1151 are arranged on the first noise reduction plate 115 for absorbing and weakening the noise transmitted downward by the fan air inlet 123. The first noise reduction plate 115 and the case 11 can also be filled with sound-absorbing material to further reduce noise.

[0083] Optionally, the inner side of the front side wall and the inner side of the rear side wall of the case 11 are provided with a second noise reduction plate 116, and a plurality of second sound absorbing holes 1161 are arranged on the second noise reduction plate 116 for absorbing and weakening the noise energy radiated by the fan 12. The second noise reduction plate 116 and the case 11 can also be filled with sound-absorbing material to further reduce noise.

[0084] Optionally, the left side wall of the case 11 is provided with a case air outlet 114, and the case air outlet 114 is arranged on the left side or the right side of the case 11. The specific position is determined according to the structure and size of the fan 12. The inner side of the right side wall of the case 11 is provided with a third noise reduction plate 117, and a plurality of third sound absorbing holes 1171 are arranged on the third noise reduction plate 117 to further absorb and weaken the noise energy radiated by the fan 12. The third noise reduction plate 117 and the case 11 can also be filled with sound-absorbing material to further reduce noise.

[0085] Optionally, the fourth noise reduction plate 27 is arranged on the noise reduction outer expansion structure 23, and a plurality of fourth sound absorbing holes 271 are arranged on the fourth noise reduction plate 27 for absorbing and weakening the noise propagated from the fan 12 to the pipeline assembly 2. The first noise reduction plate 115 and the noise reduction outer expansion structure 23 can also be filled with sound-absorbing material to further reduce noise.

[0086] To facilitate processing and manufacturing, optionally, the noise reduction outer expansion structure 23 is a planar structure, and the extension line of the median line of the noise reduction outer expansion structure 23 passes through the fan air inlet 123 of the fan 12.

[0087] In some embodiments, to improve the senior appearance, the noise reduction outer expansion structure 23 can also be an arc surface structure, and the center of the noise reduction outer expansion structure 23 passes through the fan air inlet 123 of the fan 12.

[0088] The flow guide outer expansion structure 24 can be a fixed structure or a movable structure, and optionally, the area of the flow guide outer expansion structure 24 is adjustable, and the angle of the flow guide outer expansion structure 24 relative to the horizontal plane is adjustable. The flow guide outer expansion structure 24 can be adjusted for different airflow flow states to ensure that the flow guide outer expansion structure 24 matches the performance of the fan 12, maximizes the performance of the fan 12, and further improves the adaptability to the flow working condition.

[0089] Optionally, the flow guide outer expansion structure 24 includes a first moving plate 241, a first outer expansion plate 242, a second outer expansion plate 243, and a second moving plate 244. The first moving plate 241 is movably arranged in the cabinet 11. The first outer expansion plate 242 is rotationally connected with the first moving plate 241. The first outer expansion plate 242 is slidingly connected with the second outer expansion plate 243. The second outer expansion plate 243 is rotationally connected with the second moving plate 244. The second moving plate 244 is movably arranged in the pipeline assembly 2. Through the combination of the moving pair and the rotating pair, the area of the flow guide outer expansion structure 24 is adjustable, and the angle of the flow guide outer expansion structure 24 relative to the horizontal plane is adjustable. The structure is simple, and the structural change of the flow guide outer expansion structure 24 is easy to control.

[0090] To realize the automatic adjustment of the flow guide outer expansion structure 24, optionally, a first driving assembly 245 is arranged in the cabinet 11, and the first driving assembly 245 is used to drive the first moving plate 241 to move. A second driving assembly 246 is arranged in the pipeline assembly 2, and the second driving assembly 246 is used to drive the second moving plate 244 to move. In some embodiments, the manual adjustment of the flow guide outer expansion structure 24 can also be realized through a knob, a push rod, or the like.

[0091] Optionally, the first driving 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 connected with the first nut 2453. The first nut 2453 is arranged on the first moving plate 241. The second driving 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 connected with the second nut. The second nut is arranged on the second moving plate 244. The transmission mode of the lead screw and the nut can realize relatively accurate stepless motion transmission and self-locking function, and can realize the adjustment of the angle, the outlet size, and the outer expansion starting point height of the flow guide outer expansion structure 24, thereby ensuring the structural stability of the flow guide outer expansion structure 24.

[0092] Optionally, the first sliding rail 118 is arranged in the cabinet 11, and the first moving plate 241 is in sliding cooperation with the first sliding rail 118, and the first sliding rail 118 can be in the horizontal direction, thereby ensuring the stable horizontal movement of the first moving plate 241; and the second sliding rail 28 is arranged in the pipeline assembly 2, and the second moving plate 244 is in sliding cooperation with the second sliding rail 28, and the second sliding rail 28 can be in the vertical direction, thereby ensuring the stable vertical movement of the second moving plate 244.

[0093] In order to realize the relative free rotation of the first moving plate 241 and the first outer expansion plate 242, the first hinge hole 2411 is arranged on the first moving plate 241, the second hinge hole 2421 is arranged on the first outer expansion plate 242, and the first hinge shaft is arranged in the first hinge hole 2411 and the second hinge hole 2421; in order to realize the relative free rotation of the second moving plate 244 and the second outer expansion plate 243, the third hinge hole 2431 is arranged on the second outer expansion plate 243, the fourth hinge hole is arranged on the second moving plate 244, and the second hinge shaft is arranged in the third hinge hole 2431 and the fourth hinge hole.

[0094] In order to avoid the separation of the first outer expansion plate 242 and the second outer expansion plate 243, the third sliding rail is arranged on the first outer expansion plate 242, and the second outer expansion plate 243 is in sliding cooperation with the third sliding rail; and / or, the fourth sliding rail 2432 is arranged on the second outer expansion plate 243, and the first outer expansion plate 242 is in sliding cooperation with the fourth sliding rail 2432.

[0095] Optionally, the avoiding space 29 is arranged in the pipeline assembly 2 for avoiding the flow guide outer expansion structure 24. The size of the avoiding space 29 is determined according to the maximum working space of the flow guide outer expansion structure 24, so as to avoid the interference with the movement change of the flow guide outer expansion structure 24.

[0096] Optionally, the oil leakage hole 125 is arranged on the fan 12, the oil leakage hole 125 is arranged on the end face of the fan 12 facing the lower side, and is arranged at the lowest point of the liquid flow. The oil guide channel 119 is arranged in the cabinet 11 below the fan 12, and is used for guiding the oil stains filtered by the fan 12 into the pipeline assembly 2. The oil guide channel 119 includes the oil receiving section 1191, the avoiding section 1192 and the oil outlet section 1193 which are connected in sequence, the oil receiving section 1191 is located below the oil leakage hole 125, the avoiding section 1192 is close to or abuts against the side wall of the cabinet 11 and surrounds the outer circumferential side of the air inlet 113 of the cabinet, so as to avoid affecting the air inlet flow, and at the same time, to ensure that the oil stains cannot fall on the first noise reduction plate 115 to corrode the first noise reduction plate 115, and the oil outlet section 1193 extends into the air inlet 113 of the cabinet, thereby guiding the oil stains into the pipeline assembly 2.

[0097] In order to facilitate the collection of oil stains, the smoke collecting assembly 3 includes the smoke collecting cavity 31 and the oil cup 32 arranged at the bottom of the smoke collecting cavity 31, and the oil outlet section 1193 is in communication with the oil cup 32.

[0098] In order to avoid affecting the air flow in the pipeline assembly 2, an oil receiving pipe is arranged in the pipeline assembly 2, and the oil outlet section 1193 is communicated with the oil cup 32 through the oil receiving pipe.

[0099] In order to facilitate installation, the pipeline assembly 2 comprises 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 with the cabinet 11, the air outlet of the upper connecting pipe 21 is communicated with the air inlet 113 of the cabinet, and the lower connecting pipe 22 is connected with the smoke collecting assembly 3, and the air inlet of the lower connecting pipe 22 is communicated with the smoke collecting cavity 31.

[0100] In order to avoid oil spillage in the oil guide channel 119, the oil guide channel 119 is formed by a U-shaped groove plate with an opening upward.

[0101] In order to ensure smooth transition and communication of each part of the oil guide channel 119, the oil guide channel 119 further comprises a first transition section and a second transition section, the oil receiving section 1191 is communicated with the avoiding section 1192 through the first transition section, and the avoiding section 1192 is communicated with the oil outlet section 1193 through the second transition section. The first transition section and the second transition section can be a round corner structure or a chamfer structure.

[0102] In order to facilitate processing and manufacturing, the oil receiving section 1191, the avoiding section 1192 and the oil outlet section 1193 are integrally formed.

[0103] Optionally, the height of the oil receiving section 1191, the avoiding section 1192 and the oil outlet section 1193 decreases in turn. That is to say, 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 cabinet, showing a spiral downward trend, so as to ensure that the oil stains falling into the oil receiving end can smoothly flow into the pipeline system and then into the oil cup 32.

[0104] In some embodiments, the oil guide channel 119 can also be arranged at the bottom of the cabinet 11, so that the oil guide channel 119 does not need to be installed and can also avoid deviation.

[0105] Optionally, the range hood further comprises a smoke collecting assembly 3, the smoke collecting assembly 3 is connected with the fan assembly 1 through the pipeline assembly 2. The pipeline assembly 2 has a certain gap with the wall 100, without contact to generate vibration noise, and also facilitates the installation of the pipeline assembly 2.

[0106] Optionally, the height of the cabinet 11 is T, 200mm≤T≤250mm, the height range meets the distance between the ceiling plate 300 and the kitchen top plate 200 in most users' kitchens, and the length and width of the cabinet 11 ensure that the edges of the fan 12 are close to the inner wall of the cabinet 11. The fan 12 is an ultra-thin fan, and the thickness of the fan 12 is t, 0.45≤t / T≤0.65, which ensures that when the fan 12 is located inside the cabinet 11, there is enough flow gap between the fan inlet 123 and the inner wall of the cabinet 11. On the one hand, it ensures the performance of the fan 12, and on the other hand, it also ensures that the fan assembly 1 can meet the distance between the ceiling plate 300 and the kitchen top plate 200 in most users' kitchens. The fan 12 includes a volute 121 and an impeller 122 arranged in the volute 121, the maximum width of the volute 121 is B, 410mm≤B≤600mm, and the outer diameter of the impeller 122 is D, 270mm≤D≤400mm. Optionally, the number of blades of the impeller 122 is n, 55≤n≤85. Due to the thinning of the thickness of the fan 12, the fan 12 can be a single-inlet fan. In order to ensure the working area of the impeller 122 and improve the negative impact of the thinning of the fan 12 on the performance, the outer diameter D and the number of blades n of the impeller 122 are larger than those of the impeller used in the conventional range hood. Further, the maximum width B of the volute 121 of the fan 12 is also larger than that of the conventional fan, so the cabinet 11 needs to ensure enough space in the front-rear direction.

[0107] Optionally, the angle between the fan 12 and the horizontal plane is θ, 2°≤θ≤10°, which is convenient for guiding the oil dirt filtered by the fan 12 to the same point and falling into the oil guiding channel 119 through the oil leakage hole 125. The fan 12 is inclined at a certain angle, and the wide channel side region of the fan inlet 123 is farther away from the cabinet inlet 113, which is conducive to the airflow flow of the fan inlet 123 and ensures that the fan inlet 123 has enough flow space.

[0108] In order to facilitate the placement and installation of the fan 12, the cabinet 11 can adopt a split structure. Optionally, the cabinet 11 includes a box body 111 and an end cover 112 arranged on the box body 111, the top of the box body 111 is open, the end cover 112 is capped at the opening, and the fan 12 is located in the box body 111 and is fixedly connected with the end cover 112.

[0109] Optionally, the volute 121 is provided with a fan inlet 123 and a fan outlet 124, the bottom of the box body 111 is provided with a cabinet inlet 113 in communication with the fan inlet 123, and the side wall of the box body 111 is provided with a cabinet outlet 114 in communication with the fan outlet 124. The fan assembly 1 further includes a check valve 13 arranged at the fan outlet 124, the cabinet outlet 114 is used for fixed installation and communication between the fan outlet 124 and the check valve 13, and the check valve 13 is communicated to the public flue inlet through a smoke pipe, which is used to avoid backflow of exhaust smoke to the fan 12.

[0110] In order to ensure that there is enough installation space to fix the pipeline assembly 2, the air inlet 113 of the cabinet is arranged to be spaced apart from the front side wall and the rear side wall of the cabinet 111, respectively. The distance between the air inlet 113 of the cabinet and the front side wall of the cabinet 111 is greater than the distance between the air inlet 113 of the cabinet and the rear side wall of the cabinet 111. In this way, vibration noise caused by the contact between the pipeline assembly 2 and the wall 100 can also be avoided.

[0111] Since the fan 12 is placed obliquely, in order to ensure the stable operation of the fan 12, the first fixing bracket 126, the second fixing bracket 127 and the third fixing bracket 128 are arranged on the fan 12, and the first fixing bracket 126, the second fixing bracket 127 and the third fixing bracket 128 are fixedly connected with the end cover 112. By fixing and installing the fan 12 through the first fixing bracket 126, the second fixing bracket 127 and the third fixing bracket 128, the operation stability of the fan 12 is improved, and the vibration and noise of the fan 12 are reduced.

[0112] In order to avoid the shaking of the fan 12, the first fixing bracket 126 and the second fixing bracket 127 are symmetrically arranged on both sides of the highest point in the oblique direction of the fan 12, and the third fixing bracket 128 is arranged at the lowest point in the oblique direction of the fan 12.

[0113] In order to avoid the shaking of the first fixing bracket 126 and the second fixing bracket 127 relative to the volute 121, the first arc-shaped flange 1261 and the second arc-shaped flange 1262 are arranged on the first fixing bracket 126 and the second fixing bracket 127, respectively, and the first arc-shaped flange 1261 and the second arc-shaped flange 1262 are connected with the volute 121. The first fixing bracket 126 and the second fixing bracket 127 can be in the shape of a U-shaped plate as a whole, which reduces the self-weight of the first fixing bracket 126 and the second fixing bracket 127, ensures that the first fixing bracket 126 and the second fixing bracket 127 have sufficient fixing connection contact area, and also enables the first fixing bracket 126 and the second fixing bracket 127 to have a certain elastic deformation capacity, thereby buffering the vibration of the fan 12. The top of the first fixing bracket 126 and the second fixing bracket 127 is respectively provided with a threaded hole for passing through a bolt for fixed installation.

[0114] 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.

[0115] 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 by, The application relates to a fan assembly (1) and a pipeline assembly (2) connected with the fan assembly (1). The pipeline assembly (2) is connected with the fan case (11), the inner cavity of the pipeline assembly (2) is communicated with the fan case air inlet (113), the connecting position of the pipeline assembly (2) and the fan case (11) is provided with a flow guide outer expansion structure (24), the inner surface of the flow guide outer expansion structure (24) is provided with a wing type flow guide plate (25), the wing type flow guide plate (25) has a wing type leading edge (251) and a wing type trailing edge (252), the wing type leading edge (251) is inclined downward and faces the air flow direction, and the wing type trailing edge (252) is inclined upward and is away from the air flow direction. The wing type flow guide plate (25) has a wing type highest point (253), the distance between the wing type highest point (253) and the wing type trailing edge (252) is smaller than the distance between the wing type highest point (253) and the wing type leading edge (251).

2. The hood according to claim 1, characterized in that, The wing type flow guide plate (25) is provided with a plurality of noise reduction holes (254).

3. The hood according to claim 1, characterized in that, The wing type flow guide plate (25) has a laminar flow wing type shape.

4. The hood according to claim 1, characterized in that, The wing type leading edge (251) is coincident with the outer expansion starting point of the flow guide outer expansion structure (24).

5. The hood according to claim 1, characterized in that, The wing type flow guide plate (25) and the flow guide outer expansion structure (24) are filled with sound-absorbing materials.

6. The hood according to claim 1, characterized in that, The inner side of the flow guide outer expansion structure (24) is provided with a mounting plate (26), and the wing type flow guide plate (25) is fixedly connected with the mounting plate (26).

7. The hood according to any one of claims 1-6, characterized in that, The wing type flow guide plate (25) and the flow guide outer expansion structure (24) are integrally formed.

8. The hood according to any one of claims 1-6, characterized in that, The fan (12) is inclinedly arranged in the fan case (11), and the included angle between the fan (12) and a horizontal plane is theta (2<=theta<=10).

9. The hood according to any one of claims 1-6, characterized in that, The application further relates to a smoke collection assembly (3) connected with the fan assembly (1) through the pipeline assembly (2).

10. The hood according to any one of claims 1-6, characterized in that, ​

Images