Ceiling type range hood

Abstract

The invention discloses a ceiling type range hood, and relates to the technical field of range hoods. An existing ceiling-mounted range hood has the problems that it is difficult to efficiently prevent oil fume from escaping towards the two sides, and the fume suction rate is low, and the like, the ceiling-mounted range hood comprises a machine shell, an air blowing assembly and a filtering assembly, the fume suction assembly is installed in an inner cavity of the machine shell through a fixing support, and the two sides of the machine shell are each connected with a ventilation box with an air outlet window in the bottom; a filter box communicated with an inner cavity of the ventilation box is fixedly mounted at the top of the ventilation box, an air blowing assembly detachably mounted in the ventilation box is located between the air outlet window and an opening in the bottom of the filter box, and a first transmission assembly rotating along with the smoke suction assembly is detachably mounted at the bottom of the smoke suction assembly. Downward air curtains are formed through the air blowing assemblies on the two sides to prevent cooking fume from escaping laterally and isolate lateral airflow interference, the fume suction efficiency is improved, and the kitchen air quality is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of range hoods, in particular to a top-suction range hood. Background Art

[0002] A range hood (also known as a range hood) is an appliance that purifies the kitchen environment and is typically installed above the stove. Its function is to quickly extract waste from stove combustion and harmful cooking fumes, exhausting them outdoors. It also collects and condenses the fumes to reduce pollution and purify the air, while also providing safety features such as anti-toxic and explosion-proof features. Based on their installation location, range hoods are primarily categorized as top-draft, side-draft, and downdraft. Top-draft range hoods, installed directly above the stove, offer excellent extraction efficiency, a variety of styles, and are relatively affordable.

[0003] However, existing top-mounted range hoods have the following shortcomings: First, they are limited in their ability to prevent fumes from escaping to the sides, especially when the amount of fumes is high. Second, cooking fumes are easily affected by lateral ventilation and dispersed, which is not conducive to improving the device's actual smoke extraction rate. Furthermore, existing range hoods generally lack the ability to effectively filter and remove fumes, odors, and dust that have already drifted into the kitchen, which is not conducive to improving the kitchen work environment. Therefore, a new top-mounted range hood is urgently needed to address these issues. Summary of the Invention

[0004] The technical problem to be solved and the technical task to be addressed by the present invention are to improve and enhance existing technical solutions and provide a top-suction range hood with the goal of increasing extraction efficiency and improving kitchen air quality. To this end, the present invention provides the following technical solutions.

[0005] A top-suction range hood, comprising: A casing, wherein a smoke extraction assembly is mounted in the inner cavity of the casing via a fixed bracket, a ventilation box with an air outlet window at the bottom is connected to both sides of the casing, and a filter box connected to the inner cavity of the ventilation box is fixedly mounted on the top of the ventilation box; A blowing assembly is detachably mounted inside the ventilation box and is located between the air outlet window and the bottom opening of the filter box. A first transmission assembly is detachably mounted on the bottom of the smoke extraction assembly and rotates with it. A second transmission assembly is detachably mounted inside the housing, allowing the two blowing assemblies to rotate with the first transmission assembly. A filter assembly, a fixed plate supporting the filter assembly is provided inside the filter box, a box cover with an air inlet window on one side is slidably installed on the top of the filter box, and a fastening assembly for clamping the filter assembly and synchronously positioning the box cover is provided on the box cover.

[0006] Preferably: the smoking assembly includes a smoking box fixedly connected to the fixed bracket by bolts, a motor with an output end connected to a smoking impeller is fixedly mounted on the smoking box, the bottom outer ring of the smoking impeller is rotatably connected to a fixing ring through a bearing, and the fixing ring is fixedly connected to the smoking box by bolts.

[0007] Preferably: the first transmission assembly includes a gear ring detachably mounted on the bottom of the smoking impeller, the outer ring of the gear ring is engaged with a ring gear, a rotating rod with a first bevel gear mounted on the bottom is welded to the middle of the ring gear, a support base rotatably connected to the rotating rod is fixedly mounted inside the casing, and the first bevel gear is connected to the second transmission assembly.

[0008] Preferably, the bottom of the smoking impeller is welded with a plurality of groups of mounting strips equidistantly arranged in a circle around its axis, the gear ring is slidably sleeved on the outer rings of the plurality of mounting strips, and the inner ring of the gear ring is integrally formed with a plurality of groups of connecting blocks that are snapped to the ends of two adjacent groups of mounting strips, and the connecting blocks and the ends of the mounting strips are fixedly connected by bolts.

[0009] Preferably: the second transmission assembly includes two sets of mounting seats fixedly installed in the casing, and a transmission shaft is rotatably installed inside the two sets of mounting seats through bearings. A second bevel gear meshing with the first bevel gear is fixedly installed on the transmission shaft, and a third bevel gear connected to the blowing assembly is welded at both ends of the transmission shaft.

[0010] Preferably: the blowing assembly includes two groups of frames fixedly installed inside the ventilation box, a rotating shaft is rotatably installed between the two groups of frames, a fourth bevel gear meshing with the third bevel gear is fixedly installed at one end of the rotating shaft, and two groups of blowing impellers for supplying air downwards are fixedly installed on the surface of the rotating shaft located between the two groups of frames.

[0011] Preferably: the filter assembly includes a ventilation basket welded to the bottom of the fixed plate, a filter basket is placed inside the ventilation basket, a sealing strip supporting the top flange of the filter basket is bonded to the top of the fixed plate, the top flange of the filter basket is in contact with the bottom of the fastening assembly, and a plurality of baffles arranged vertically are welded to the outer ring of the ventilation basket; the baffles gradually increase from bottom to top.

[0012] Preferably: the fastening assembly includes an adjusting screw rotatably connected to the L-shaped box cover, both sides of the L-shaped box cover are slidably connected to the top of the filter box, the adjusting screw is threadedly connected to a lower pressure frame that abuts the top of the filter basket, and the four corners of the lower pressure frame are welded with positioning rods that slide through the fixed plate and the box cover, and the tops of the two groups of positioning rods on the same side are welded with the same limit strip.

[0013] Preferably: the bottom of the casing is detachably mounted with an oil fume separation assembly located directly below the smoke extraction assembly and an oil collecting box receiving the bottom end of the oil fume separation assembly; the bottom of the casing is welded with a positioning plate supporting the oil collecting box and two sets of first hanging ears supporting the oil fume separation assembly; the back of the oil collecting box is welded with two sets of second hanging ears that are engaged with the L-shaped grooves on the positioning plate.

[0014] Preferably, the oil fume separation assembly comprises two groups of mesh disk brackets, and the interiors of the two groups of mesh disk brackets are provided with a plurality of groups of equally spaced arc-shaped guide strips, and both ends of the guide strips are flush with the side edges of the mesh disk brackets; Two groups of positioning screws are slidingly passed through the interior of the two groups of mesh disk brackets, and one end of the positioning screw is welded with a hanging plate that is snap-fitted with the first hanging ear. One group of the mesh disk brackets is provided with a groove for accommodating the hanging plate, and the other group of the mesh disk brackets is abutted with a nut threadedly connected to the positioning screw. After the two groups of mesh disk brackets are docked, the guide strips inside them are staggered.

[0015] Compared with the prior art, the present invention has the following beneficial effects: Both sides of the device are equipped with downward air blowing components, so that air barriers are formed at the bottom of both sides when the range hood is running, which can effectively prevent the oil smoke from escaping to both sides. The wind wall can block the interference of external airflow on both sides, so that the rising oil smoke is stably absorbed into the interior of the range hood, further improving the range hood's absorption rate of oil smoke. The blowing component runs together with the exhaust component through the first transmission component and the second transmission component. The synchronous operation of each component is also conducive to improving the overall stability of the system. The single drive component is also convenient for later maintenance.

[0016] The device is also provided with a filter box connected to the ventilation box, and a filter assembly is provided inside the filter box. The blowing assembly can draw the air from the upper part of the kitchen to the filter assembly and then transport it downward. The filter assembly effectively removes oil smoke, odor and dust in the air, which is convenient for improving the air quality in the kitchen, improving the ventilation efficiency inside the kitchen to keep the air fresh, and also keeping the temperature inside the kitchen balanced to avoid local overheating or overcooling, thereby improving the overall comfort of the kitchen environment. Timely filtering of oil smoke floating in the upper part of the kitchen can also effectively avoid the accumulation of stains on the ceiling, reducing the difficulty of subsequent cleaning of the kitchen. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 A bottom view of the overall structure of the present invention; Figure 3 A bottom view of the inner cavity structure of the housing of the present invention; Figure 4 A schematic diagram of the disassembled structure of one side of the housing of the present invention; Figure 5 It is a first cross-sectional view of the overall structure of the present invention; Figure 6 is a second cross-sectional view of the overall structure of the present invention; Figure 7 It is a schematic diagram of the structure of the smoking assembly and the first transmission assembly of the present invention; Figure 8 This is a schematic diagram of the disassembly of the oil fume separation component structure of the present invention; Figure 9 For the present invention Figure 6 A magnified view of the middle panel.

[0018] Legend: 10. Casing; 11. Fixing bracket; 12. Air outlet window; 13. Ventilation box; 14. Filter box; 15. Fixing plate; 16. Box cover; 17. Mounting strip; 18. Connecting block; 19. Oil collecting box; 110. Positioning plate; 111. First mounting bracket; 112. L-shaped chute; 113. Second mounting bracket; 114. Groove; 115. Air inlet window; 20. Smoke extraction assembly; 21. Smoke extraction box; 22. Smoke extraction impeller; 23. Motor; 24. Fixing ring; 30. Blowing assembly; 31. Frame; 32. Rotating shaft; 33. Fourth bevel gear; 34. Blowing impeller; 40. First transmission assembly; 41. Ring gear; 42. Ring gear; 43. First bevel gear; 44. Rotating rod; 45. Support seat; 50. Second transmission assembly; 51. Mounting seat; 52. Transmission shaft; 53. Second bevel gear; 54. Third bevel gear; 60. Filter assembly; 61. Ventilation basket; 62. Filter basket; 63. Sealing strip; 64. Stop bar; 70. Fastening assembly; 71. Adjusting screw; 72. Pressing frame; 73. Positioning rod; 74. Limiting strip; 80. Oil fume separation assembly; 81. Net disk bracket; 82. Guide strip; 83. Positioning screw; 84. Hanging plate; 85. Nut. DETAILED DESCRIPTION

[0019] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0020] See also Figures 1 to 9In an embodiment of the present invention, a top-suction range hood includes a housing 10, a blowing assembly 30, a filter assembly 60, etc. The inner cavity of the housing 10 is equipped with a smoke extraction assembly 20 through a fixing bracket 11. The fixing bracket 11 can be directly fixed and assembled with the housing 10 by bolts. A ventilation box 13 with an air outlet window 12 at the bottom is connected to both sides of the housing 10. A filter box 14 communicating with the inner cavity of the ventilation box 13 is fixedly installed on the top of the ventilation box 13. The blowing assembly 30 detachably installed inside the ventilation box 13 is located between the air outlet window 12 and the filter box. 14, the bottom of the smoking assembly 20 is detachably mounted with a first transmission assembly 40 that rotates with it, and the interior of the casing 10 is detachably mounted with a second transmission assembly 50 that enables the two sets of blowing assemblies 30 to rotate along with the first transmission assembly 40. The interior of the filter box 14 is provided with a fixing plate 15 that supports the filter assembly 60, and the top of the filter box 14 is slidably mounted with a box cover 16 with an air inlet window 115 on one side, and the box cover 16 is provided with a fastening assembly 70 for clamping the filter assembly 60 and synchronously positioning the box cover 16.

[0021] When the top-suction range hood is actually in operation, the smoke extraction component 20 is turned on to draw the oil smoke generated by cooking upward from the bottom window of the casing 10. The rising oil smoke is transported to the exhaust pipe connected to its top through the smoke extraction component 20. The exhaust pipe is connected to the common flue of the building to transport the oil smoke outside the kitchen. The lighting and control panel equipped with the top-suction range hood are all existing technologies and are not described in detail here. When the smoke extraction component 20 is in operation, it can drive the first transmission component 40 installed at its bottom end to operate, and the first transmission component 40 drives the blowing components 30 on both sides to operate synchronously through the second transmission component 50.

[0022] The rotating blowing assembly 30 can draw the air in the upper space of the kitchen from the top of the filter box 14 to the air outlet window 12 and then transport it downward. The air transported by the blowing assembly 30 can be processed by the filter assembly 60, which can effectively remove the oil smoke and other odors floating around in the kitchen, and is also conducive to dust removal and air purification in the kitchen. The air transported by the blowing assembly 30 to the two sides of the bottom of the top-suction range hood can form a certain barrier air curtain, which can effectively prevent the oil smoke generated by cooking from escaping to both sides of the device, and the downward-delivered air curtain cooperates with the rising airflow in the center of the device to conveniently carry the oil smoke into the exhaust assembly 20 efficiently and stably and transport it out of the kitchen.

[0023] In one embodiment, see Figures 1 to 7Specifically, the smoking assembly 20 includes a smoking box 21 fixedly connected to the fixed bracket 11 by bolts, and a motor 23 whose output end is connected to the smoking impeller 22 is fixedly installed on the smoking box 21. The bottom outer ring of the smoking impeller 22 is rotatably connected to the fixing ring 24 through a bearing, and the fixing ring 24 is fixed to the smoking box 21 by bolts. When the smoking assembly 20 horizontally installed inside the casing 10 needs to be operated, the motor 23 is started to drive the smoking impeller 22 to rotate. The motor 23 and the smoking impeller 22 can both adopt equipment models commonly used in the prior art. The rotating smoking impeller 22 can draw the smoke below the equipment to the opening at the top of the smoking box 21 and transport it to the exhaust pipe connected thereto, etc. The fixing ring 24 connects the smoking impeller 22 and the smoking box 21 to improve the overall stability of the device operation.

[0024] The bottom end of the smoking impeller 22 is connected to the first transmission assembly 40 and can drive it to rotate together. Accordingly, the first transmission assembly 40 includes a gear ring 41 detachably mounted on the bottom of the smoking impeller 22, and the outer ring of the gear ring 41 is engaged with a ring gear 42. The middle part of the ring gear 42 is welded with a rotating rod 44 with a first bevel gear 43 installed on the bottom. The interior of the casing 10 is fixedly mounted with a support base 45 rotatably connected to the rotating rod 44, and the first bevel gear 43 is connected to the second transmission assembly 50. In detail, the second transmission assembly 50 includes two groups of mounting bases 51 fixedly mounted in the casing 10, and the interiors of the two groups of mounting bases 51 are rotatably mounted with a transmission shaft 52 through bearings. A second bevel gear 53 meshing with the first bevel gear 43 is fixedly mounted on the transmission shaft 52, and both ends of the transmission shaft 52 are welded with a third bevel gear 54 connected to the blowing assembly 30.

[0025] The rotation of the smoking impeller 22 can drive the ring gear 41 fixed to it to rotate, the ring gear 41 drives the ring gear 42 to rotate, the ring gear 42 drives the rotating rod 44 and the first bevel gear 43 at its bottom end to rotate, the rotation of the first bevel gear 43 can drive the second bevel gear 53 and the transmission shaft 52 to rotate, the transmission shaft 52 can drive the two groups of blowing components 30 to operate synchronously through the third bevel gears 54 at both ends, and the single drive component controls the synchronous operation of the two groups of blowing components 30 and the group of smoking components 20. The overall structure of the system is relatively simple, which is conducive to the production and maintenance of the equipment. Accurate control of the synchronous operation between components can improve the stability of the system and also help make the overall equipment more energy-saving and environmentally friendly.

[0026] Among them, the bottom of the smoking impeller 22 is welded with multiple groups of mounting strips 17 that are equidistantly arranged in a circle around its axis. The gear ring 41 is slidably sleeved on the outer rings of the multiple groups of mounting strips 17, and the inner ring of the gear ring 41 is integrally formed with multiple groups of connecting blocks 18 that are snapped into the ends of two adjacent groups of mounting strips 17. The connecting blocks 18 and the ends of the mounting strips 17 are fixedly connected by bolts. The support seat 45 installed inside the casing 10 by bolts provides support for the rotating rod 44, and the mounting seat 51 installed inside the casing 10 by bolts provides support for the transmission shaft 52. Each component can be easily disassembled separately, which is beneficial to the subsequent maintenance and replacement of the internal components of the equipment.

[0027] Based on the above embodiments, see Figures 3 to 7 and Figure 9 Specifically, the blowing assembly 30 includes two sets of frame plates 31 fixedly installed inside the ventilation box 13, and a rotating shaft 32 is rotatably installed between the two sets of frame plates 31. One end of the rotating shaft 32 is fixedly installed with a fourth bevel gear 33 meshing with the third bevel gear 54. The rotating shaft 32 is located on the surface between the two sets of frame plates 31 and has two sets of blowing impellers 34 fixedly installed on it to supply air downward. The third bevel gear 54 that rotates with the transmission shaft 52 can drive the fourth bevel gear 33 to rotate, and the fourth bevel gear 33 drives the two sets of blowing impellers 34 fixedly installed on its surface to rotate. The blowing impeller 34 can draw air from the upper half of the kitchen from the filter box 14 to the air outlet window 12 and transport it downward.

[0028] The air flowing through the inner cavity of the filter box 14 can be filtered by the filter component 60 and then discharged downward. The filter component 60 removes oil smoke, odor and dust, etc., which can effectively improve the air quality in the kitchen, reduce harmful substances that affect people's health or contaminate dishes, etc., improve the ventilation efficiency inside the kitchen to keep the air fresh, and also keep the temperature inside the kitchen balanced to avoid local overheating or overcooling.

[0029] Correspondingly, the filter assembly 60 includes a ventilation basket 61 welded to the bottom of the fixed plate 15. The ventilation basket 61 can be made of a material such as metal with a mesh. A filter basket 62 is placed inside the ventilation basket 61. The filter basket 62 can be made of activated carbon, HEPA filter, electrostatic filter plate or other composite materials with good ventilation properties, or a combination of various materials can be used according to actual conditions. A sealing strip 63 is bonded to the top of the fixed plate 15 to support the top flange of the filter basket 62. The top flange of the filter basket 62 abuts against the bottom of the fastening assembly 70, which can facilitate the replacement of the filter basket 62 after long-term use. The outer ring of the ventilation basket 61 is welded with a plurality of baffles 64 arranged in an upper and lower manner; the baffles 64 gradually increase from bottom to top, and the stepped and evenly distributed baffles 64 facilitate ensuring the filtration frequency of the two side plates of the filter basket 62, thereby avoiding that the filtration frequency of the bottom of the filter basket 62 is seriously higher than that of the two sides during actual use, which is conducive to fully utilizing the filter basket 62 and reducing unnecessary material waste.

[0030] Among them, the fastening assembly 70 includes an adjusting screw 71 rotatably connected to the L-shaped box cover 16. The box cover 16 and the adjusting screw 71 can be rotatably connected through bearings. The two sides of the L-shaped box cover 16 are slidably connected to the top of the filter box 14. The adjusting screw 71 is threadedly connected to a lower pressure frame 72 that abuts the top of the filter basket 62. The four corners of the lower pressure frame 72 are welded with positioning rods 73 that slide through the fixed plate 15 and the box cover 16. The tops of the two groups of positioning rods 73 on the same side are welded with the same limiting strip 74. When the filter basket 62 needs to be replaced, the adjusting screw 7 is rotated. 1. The adjusting screw 71 drives the pressing frame 72 to move up and down, and the pressing frame 72 drives the positioning rod 73 to slide up and down inside the L-shaped box cover 16. When the bottom end of the positioning rod 73 moves to the outside of the fixing plate 15, the L-shaped box cover 16 can be pulled to slide left and right on the top of the filter box 14. Removing the box cover 16 can facilitate the rapid replacement of the filter basket 62 inside the filter box 14. After the new filter basket 62 is installed, it is also convenient to use the fastening assembly 70 to quickly fix the filter basket 62 and the box cover 16. The simple structure is convenient for actual operation.

[0031] In one embodiment, see Figures 1 to 6 and Figure 8 The bottom of the casing 10 is detachably mounted with an oil fume separation assembly 80 located just below the smoke extraction assembly 20 and an oil collecting box 19 supporting the bottom end of the oil fume separation assembly 80. A positioning plate 110 supporting the oil collecting box 19 and two sets of first hanging ears 111 supporting the oil fume separation assembly 80 are welded to the bottom of the casing 10. Two sets of second hanging ears 113 engaged with the L-shaped slide grooves 112 on the positioning plate 110 are welded to the back of the oil collecting box 19. The first hanging ear 111, the second hanging ear 113 and the positioning plate 110 can facilitate the assembly and disassembly of the oil collecting box 19 and the oil fume separation assembly 80.

[0032] Specifically, the oil fume separation assembly 80 includes two groups of mesh disk brackets 81, and the interior of the two groups of mesh disk brackets 81 is provided with multiple groups of equally spaced arc-shaped guide strips 82, and both ends of the guide strips 82 are flush with the side edges of the mesh disk brackets 81. Two groups of positioning screws 83 slide through the interior of the two groups of mesh disk brackets 81, and one end of the positioning screw 83 is welded with a hanging plate 84 that is snap-fitted with the first hanging ear 111. One group of mesh disk brackets 81 is provided with a groove 114 for accommodating the hanging plate 84, and the other group of mesh disk brackets 81 is abutted with a nut 85 threadedly connected to the positioning screw 83. After the two groups of mesh disk brackets 81 are docked, the guide strips 82 inside them are staggered.

[0033] The two groups of mesh disk brackets 81 are fastened by nuts 85, hanging plates 84 and positioning screws 83. After assembly, the two groups of mesh disk brackets 81 are quickly installed on the first hanging ear 111 through the hanging plates 84. The mesh disk brackets 81 and the guide strips 82 inside them are located directly below the opening at the bottom of the casing 10. When the smoke extraction component 20 is in operation, the oil smoke under the device can be drawn into the interior through the gaps between the guide strips 82. The staggered guide strips 82 can facilitate the separation of oil smoke, avoid oil droplets contaminating the smoke extraction component 20 and reducing the service life of the device, and the oil droplets attached to the surface of the guide strips 82 can flow to the oil collection box 19 at the bottom for collection, which can facilitate the centralized cleaning of oil stains, and the two detachable groups of mesh disk brackets 81 can facilitate comprehensive cleaning of the components.

[0034] The contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0035] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A top suction range hood, characterized in that: include: A housing (10), wherein an inner cavity of the housing (10) is mounted with a smoke extraction assembly (20) via a fixing bracket (11), a ventilation box (13) with an air outlet window (12) at the bottom is connected to both sides of the housing (10), and a filter box (14) connected to the inner cavity of the ventilation box (13) is fixedly mounted on the top of the ventilation box (13); A blowing assembly (30) is detachably mounted inside the ventilation box (13) and is located between the air outlet window (12) and the bottom opening of the filter box (14); a first transmission assembly (40) is detachably mounted on the bottom of the smoke extraction assembly (20) and rotates with it; and a second transmission assembly (50) is detachably mounted inside the housing (10) and enables the two sets of blowing assemblies (30) to rotate with the first transmission assembly (40); A filter assembly (60) is provided inside the filter box (14) for supporting the filter assembly (60), a box cover (16) with an air inlet window (115) on one side is slidably mounted on the top of the filter box (14), and a fastening assembly (70) for clamping the filter assembly (60) and synchronously positioning the box cover (16) is provided on the box cover (16).

2. The top-suction range hood according to claim 1, characterized in that: The smoking assembly (20) includes a smoking box (21) fixedly connected to the fixed bracket (11) by bolts, a motor (23) whose output end is connected to the smoking impeller (22) is fixedly mounted on the smoking box (21), the bottom outer ring of the smoking impeller (22) is rotatably connected to a fixing ring (24) through a bearing, and the fixing ring (24) is fixedly connected to the smoking box (21) by bolts.

3. The top-suction range hood according to claim 2, characterized in that: The first transmission assembly (40) includes a gear ring (41) detachably mounted on the bottom of the smoking impeller (22); the outer ring of the gear ring (41) is meshed with a ring gear (42); a rotating rod (44) with a first bevel gear (43) mounted on the bottom is welded to the middle of the ring gear (42); a support base (45) rotatably connected to the rotating rod (44) is fixedly mounted inside the housing (10); and the first bevel gear (43) is connected to the second transmission assembly (50).

4. The top-suction range hood according to claim 3, characterized in that: The bottom of the smoking impeller (22) is welded with a plurality of mounting strips (17) arranged equidistantly in a circumferential manner around its axis, the gear ring (41) is slidably sleeved on the outer rings of the plurality of mounting strips (17), and the inner ring of the gear ring (41) is integrally formed with a plurality of connecting blocks (18) that are snapped to the ends of two adjacent sets of mounting strips (17), and the connecting blocks (18) and the ends of the mounting strips (17) are fixedly connected by bolts.

5. The top-suction range hood according to claim 3, characterized in that: The second transmission assembly (50) comprises two sets of mounting seats (51) fixedly mounted in the housing (10), wherein a transmission shaft (52) is rotatably mounted inside the two sets of mounting seats (51) via bearings, and a second bevel gear (53) meshing with the first bevel gear (43) is fixedly mounted on the transmission shaft (52), and a third bevel gear (54) connected to the blowing assembly (30) is welded to both ends of the transmission shaft (52).

6. The top-suction range hood according to claim 5, characterized in that: The blowing assembly (30) includes two sets of frame plates (31) fixedly mounted inside the ventilation box (13), a rotating shaft (32) is rotatably mounted between the two sets of frame plates (31), a fourth bevel gear (33) meshing with a third bevel gear (54) is fixedly mounted at one end of the rotating shaft (32), and two sets of blowing impellers (34) for sending air downwards are fixedly mounted on the surface of the rotating shaft (32) located between the two sets of frame plates (31).

7. A top-suction range hood according to any one of claims 1 to 6, characterized in that: The filter assembly (60) comprises a ventilation basket (61) welded to the bottom of the fixing plate (15), a filter basket (62) is placed inside the ventilation basket (61), a sealing strip (63) supporting the top flange of the filter basket (62) is bonded to the top of the fixing plate (15), the top flange of the filter basket (62) abuts against the bottom of the fastening assembly (70), and a plurality of retaining bars (64) arranged in an upper and lower direction are welded to the outer ring of the ventilation basket (61); the retaining bars (64) gradually increase in length from bottom to top.

8. The top suction range hood according to claim 7, characterized in that: The fastening assembly (70) includes an adjusting screw (71) rotatably connected to the L-shaped box cover (16), and both sides of the L-shaped box cover (16) are slidably connected to the top of the filter box (14). The adjusting screw (71) is threadedly connected to a lower pressure frame (72) that abuts the top of the filter basket (62). Positioning rods (73) that slide through the fixed plate (15) and the box cover (16) are welded at the four corners of the lower pressure frame (72). The tops of the two groups of positioning rods (73) on the same side are welded with the same limiting strip (74).

9. The top-suction range hood according to claim 1, characterized in that: The bottom of the housing (10) is detachably mounted with an oil fume separation assembly (80) located directly below the smoke extraction assembly (20) and an oil collecting box (19) receiving the bottom end of the oil fume separation assembly (80). The bottom of the housing (10) is welded with a positioning plate (110) supporting the oil collecting box (19) and two groups of first hanging ears (111) supporting the oil fume separation assembly (80). The back of the oil collecting box (19) is welded with two groups of second hanging ears (113) engaged with the L-shaped sliding grooves (112) on the positioning plate (110).

10. The top suction range hood according to claim 9, characterized in that: The oil smoke separation assembly (80) comprises two groups of net disk brackets (81), and the interiors of the two groups of net disk brackets (81) are provided with a plurality of groups of equally spaced arc-shaped guide strips (82), and both ends of the guide strips (82) are flush with the side edges of the net disk brackets (81); Two groups of positioning screws (83) are slidably passed through the interior of the two groups of mesh disk brackets (81), and one end of the positioning screw (83) is welded with a hanging plate (84) that is snap-fitted with the first hanging ear (111). One group of the mesh disk brackets (81) is provided with a groove (114) for accommodating the hanging plate (84), and the other group of the mesh disk brackets (81) is abutted with a nut (85) threadedly connected to the positioning screw (83). After the two groups of the mesh disk brackets (81) are docked, the guide strips (82) inside them are staggered.

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