A ceiling-mounted range hood

Abstract

The application discloses a ceiling type oil fume exhauster and belongs to the oil fume exhauster field. At present, oil fume cannot be fully filtered and separated, grease is adhered to the surface of a fan, the performance of the fan is reduced, resistance is increased, and the service life of the oil fume exhauster is shortened. The application comprises a fan assembly and a smoke collecting hood. The smoke collecting hood comprises an air inlet mesh cover, a spiral filter, a driving motor, a supporting base, a smoke inlet pipe and an oil collecting box. The output end of the driving motor is rotationally connected with the supporting base, and the driving motor is connected with the inner wall of the smoke inlet pipe. The fan assembly comprises a lifting assembly. The lifting assembly comprises an electric telescopic rod. The output end of the electric telescopic rod is fixedly connected with the outer wall of the smoke inlet pipe. In the application, flue gas enters the air inlet of the filter through the air inlet mesh cover. Through centrifugal action, particulate matters are thrown to the surface of the filter and are adsorbed thereon, gradually condense into large particles and slide downward to the oil collecting box under the action of gravity, so that oil fume separation is realized, and the oil fume filtering efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of range hood technology, and more particularly to a ceiling-mounted range hood. Background Technology

[0002] A range hood (also known as a smoke hood or cooking hood) is a kitchen appliance used to purify the kitchen environment. Range hoods are typically installed above or behind the stove in the kitchen. They quickly remove waste products from combustion and cooking fumes, expelling them outdoors. Simultaneously, they condense and collect the fumes, reducing pollution and achieving the goal of purifying the air.

[0003] Existing range hoods directly extract grease, resulting in low filtration efficiency. Most grease still enters the range hood cavity, especially the fan cavity. Over time, grease accumulates and adheres to the fan surface, causing decreased fan performance, increased resistance, and increased noise. Simultaneously, the smoke extraction effect diminishes, affecting the range hood's usability. Because the fan is positioned high and difficult to disassemble, users cannot clean the accumulated grease promptly. Furthermore, grease adheres to the flue pipe or check valve, causing difficulty in opening and closing the check valve due to the high viscosity of the grease. Long-term grease accumulation on the flue pipe corrodes it, leading to pipe rupture and significantly shortening the range hood's lifespan. Summary of the Invention

[0004] The purpose of this invention is to provide a ceiling-mounted range hood to address the problem of insufficient filtration and separation of oil fumes, which causes grease to adhere to the fan surface, resulting in decreased fan performance, increased resistance, and shortened lifespan of the range hood.

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

[0006] A ceiling-mounted range hood includes: a fan assembly and a smoke collection hood located below the fan assembly.

[0007] The smoke hood includes an air inlet screen, a spiral filter, a drive motor for driving the filter, a support base, a smoke inlet pipe, and an oil collection box. The filter is located inside the air inlet screen, and the bottom of the filter is inserted into the support base. The output end of the drive motor is rotatably connected to the support base, and the drive motor is connected to the inner wall of the smoke inlet pipe. The bottom of the smoke inlet pipe is connected to the top of the air inlet screen by screws. The oil collection box is located below the support base and is connected to the air inlet screen.

[0008] The fan assembly includes an upper housing, an impeller, a volute, a motor, and a lifting assembly. The top of the smoke inlet pipe is inserted into the inner cavity of the upper housing, the impeller is installed inside the volute, and the output end of the motor is connected to the impeller. The lifting assembly includes an electric telescopic rod, one end of which is fixedly connected to the inner wall of the upper housing, and the output end of which is fixedly connected to the outer wall of the smoke inlet pipe.

[0009] Furthermore, the support base is provided with a V-shaped groove, and the bottom of the filter is provided with a slider that cooperates with the groove. The opening of the groove is larger than the diameter of the slider, and the bottom of the groove is provided with an oil leakage hole, which is connected to the oil collection box.

[0010] Furthermore, the bottom of the drive motor is provided with a fixing frame, which includes a first retaining ring, a second retaining ring, and a connecting rod installed between the first retaining ring and the second retaining ring. The drive motor is installed on the top of the first retaining ring, and the output end of the drive motor passes through the first retaining ring. The outer wall of the second retaining ring abuts against the inner wall of the smoke inlet pipe. The diameter of the end of the second retaining ring near the filter is larger than the diameter of the other end. The diameter of the first retaining ring is smaller than the diameter of the second retaining ring, and the diameter of the first retaining ring is larger than the diameter of the output end of the drive motor.

[0011] Furthermore, the air inlet screen is cylindrical, and the outer peripheral wall of the air inlet screen has several air inlet holes, which are connected to the air inlet of the filter. The bottom of the smoke inlet pipe is provided with a ring-shaped light strip.

[0012] Furthermore, the top of the support base is provided with a mounting seat, on which a rotating shaft is fixedly inserted. The rotating shaft is fixedly connected to the output end of the drive motor. Multiple rotating rods are provided on the shaft, and the other end of the rotating rods is fixedly connected to the inner wall of the filter.

[0013] Furthermore, a fixing ring is fitted on the outer wall of the smoke inlet pipe, the top of the fixing ring is fixedly connected to the output end of the electric telescopic rod, a limiting block is provided above the fixing ring, a cylindrical hole is opened on the limiting block, the end of the limiting block away from the cylindrical hole is fixedly connected to the outer wall of the smoke inlet pipe, and the output end of the electric telescopic rod passes through the cylindrical hole and extends out to be fixedly connected to the fixing ring.

[0014] Furthermore, a baffle is fitted on the smoke collection hood, and the body of the smoke inlet pipe passes through the baffle. The outer peripheral wall diameter of the baffle is larger than the outer peripheral wall diameter of the smoke collection hood.

[0015] The baffle is made of glass.

[0016] Furthermore, the oil collection box is conical, and the diameter of the top of the oil collection box is smaller than the diameter of the air inlet screen.

[0017] Furthermore, the bottom of the upper housing is provided with a movable groove, the top end of the smoke inlet pipe passes through the movable groove, the fixing ring is located between the volute and the movable groove, and an annular groove is provided on the inner wall of the movable groove, with a sealing gasket inside the annular groove.

[0018] Furthermore, the filter is provided with an elastic gasket at the top, and the elastic gasket is O-shaped.

[0019] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0020] In this invention, firstly, when the spiral filter is not rotating, the fumes can pass directly through the filter mesh to the center and be filtered by multiple layers of filter plates, allowing the fumes to be filtered and adhered to the outer wall of the spiral filter over a large area, flowing downwards along the outer wall. Secondly, by driving the motor to rotate the spiral filter at an accelerated speed, large particles of fumes are thrown to the side wall of the filter by centrifugal force during the flow of fumes through the spiral air passage and adhere to the side wall. Through the aggregation of oil, the weight of the oil increases, and gravity causes the oil to slide down the side wall of the filter into the chute and drip into the oil collection box through the oil drain hole. Thirdly, while the range hood is absorbing fumes, the fumes also pass radially through the filter holes to the center of the spiral filter, blowing the oil in the filter holes towards the inner wall and sliding down along the inner wall, avoiding the possibility of the filter holes being blocked by oil and accelerating the sliding of oil in the filter holes, thereby effectively improving the filtration of fumes. The design is reasonable and easy to clean.

[0021] Secondly, the lifting mechanism allows the electric telescopic rod to move the entire fume hood up and down. This makes it convenient to move the fume hood downwards when closer to the cooking environment is needed. When cooking, if the cookware is high, to avoid the fume hood obstructing the cookware (such as a four-layer stacked steamer), the electric telescopic rod can be activated to move the fume hood upwards. This allows users to adjust the fume hood as needed, effectively absorbing cooking fumes while greatly improving the user experience. Attached Figure Description

[0022] Figure 1 A schematic diagram of the overall structure of a ceiling-mounted range hood according to an embodiment of the present invention is shown;

[0023] Figure 2 A schematic diagram of the spiral filter and supporting base provided according to an embodiment of the present invention is shown;

[0024] Figure 3 A cross-sectional view of a filter, a support base, a slide, and a slider provided according to an embodiment of the present invention is shown;

[0025] Figure 4 A schematic diagram of the structure of a first retaining ring, a second retaining ring, and a drive motor provided according to an embodiment of the present invention is shown;

[0026] Figure 5 This diagram shows a schematic internal cross-sectional view of a range hood provided according to an embodiment of the present invention.

[0027] Figure 6 The structure of the electric telescopic rod and the limiting block provided according to an embodiment of the present invention is shown;

[0028] Figure 7 It shows Figure 5 Enlarged detail of the annular groove and sealing gasket at point A;

[0029] Figure 8 A schematic diagram of the movable groove of the upper housing provided according to an embodiment of the present invention is shown.

[0030] Legend:

[0031] 10. Fan assembly; 11. Upper casing; 112. Moving groove; 113. Annular groove; 114. Sealing gasket; 12. Impeller; 13. Volute; 14. Motor; 16. Check valve; 17. Sealing plate;

[0032] 20. Smoke hood; 21. Air inlet mesh cover; 211. Air inlet hole; 22. Filter; 221. Elastic gasket; 222. Air inlet; 223. Slider; 23. Drive motor; 24. Support base; 241. Mounting base; 242. Rotating shaft; 243. Rotating rod; 244. Slide groove; 245. Oil drain hole; 25. Smoke inlet pipe; 26. Oil collection box; 27. Fixing bracket; 225. Light strip; 28. Fixing ring; 271. First retaining ring; 272. Second retaining ring; 273. Connecting rod; 29. ​​Baffle;

[0033] 30. Lifting assembly; 31. Electric telescopic rod; 32. Limiting block; 33. Cylindrical hole. Detailed Implementation

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described 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.

[0035] Please see Figure 1-8The present invention provides a technical solution: a ceiling-mounted range hood, comprising: a fan assembly 10 and a smoke collection hood 20 located below the fan assembly 10.

[0036] The smoke hood 20 includes an air inlet screen 21, a spiral filter 22, a drive motor 23 for driving the filter 22, a support base 24, a smoke inlet pipe 25, and an oil collection box 26. The filter 22 is located inside the air inlet screen 21. The spiral air passage of the filter 22 causes large particles of oil smoke to adhere to the spiral filter 22 due to centrifugal force during the flow of oil fumes, without affecting the continuous adsorption speed. The bottom of the filter 22 is inserted into the support base 24. The output end of the drive motor 23 is rotatably connected to the support base 24. The drive motor 23 is connected to the inner wall of the smoke inlet pipe 25. The bottom of the smoke inlet pipe 25 is connected to the top of the air inlet screen 21 by screws. The oil collection box 26 is located below the support base 24 and is detachably connected to the air inlet screen 21.

[0037] In some embodiments of the present invention, the air inlet mesh cover 21 is a cylindrical tube, and the outer peripheral wall of the air inlet mesh cover 21 is provided with a plurality of air inlet holes 211. The air inlet holes 211 are connected to the air inlet 222 of the filter 22. The oil fumes generated by the stove cooking are drawn into the spiral air passage of the filter 22 through the air inlet holes 211 and the spiral air passage causes large oil fumes to be impacted on the side wall of the filter 22 under the action of centrifugal force and adsorbed on the housing of the filter 22. After accumulating to a certain weight, the adsorbed oil stains can automatically slide down due to the downward action of gravity.

[0038] The bottom of the flue pipe 25 is equipped with a ring light strip 225. The ring light strip 225 has the characteristics of concentrated light, brightness and no shadow, providing users with a high-quality lighting environment. At the same time, the ring light strip 225 can also serve as a decoration to create different atmospheres and greatly enhance the user's cooking experience.

[0039] In some embodiments of the present invention, the support base 24 is provided with a V-shaped groove 244, and the bottom of the filter 22 is provided with a slider 223 that cooperates with the groove 244. The opening of the groove 244 is larger than the diameter of the slider 223. The bottom of the groove 244 is provided with an oil leakage hole 245, which is connected to the oil collection box 26. Through the cooperation of the groove 244 and the slider 223, the oil stains adhering to the filter 22 can slide down along the slider 223 under the action of gravity and be collected into the oil leakage hole 245. Then, the oil stains drip into the oil collection box 26 through the oil leakage hole 245, thereby facilitating the user to disassemble and clean the oil collection box 26.

[0040] In some embodiments of the present invention, the top of the filter 22 is provided with an elastic gasket 221. The elastic gasket 221 is O-shaped. The elastic gasket 221 can not only seal the smoke inlet pipe 25 when it comes into contact with the top of the filter 22, preventing unfiltered gas from being directly adsorbed into the ventilation pipe of the smoke inlet pipe 25, but also protect the filter 22 from deformation and damage caused by the cover plate at the bottom of the smoke inlet pipe 25 when it is squeezed, which would reduce the sealing performance and affect the separation of oil fumes.

[0041] In some embodiments of the present invention, the bottom of the drive motor 23 is provided with a fixing frame 27. The fixing frame 27 includes a first retaining ring 271, a second retaining ring 272, and a connecting rod 273 installed between the first retaining ring 271 and the second retaining ring 272. The drive motor 23 is installed on the top of the first retaining ring 271, and the output end of the drive motor 23 passes through the first retaining ring 271. The outer wall of the second retaining ring 272 abuts against the inner wall of the smoke inlet pipe 25. The diameter of one end of the second retaining ring 272 near the filter 22 is larger than the diameter of the other end. The second retaining ring 272 is able to make a more secure contact with the peripheral wall of the smoke inlet pipe 25 through the gravity of the drive motor 23 and the second retaining ring 272 itself. When disassembly and maintenance are required, the second retaining ring 272 can be moved in the direction of the drive motor 23 to remove the fixing bracket 27 from the smoke inlet pipe 25, which makes it easier to disassemble, clean and maintain later. The diameter of the first retaining ring 271 is smaller than the diameter of the second retaining ring 272, and the diameter of the first retaining ring 271 is larger than the diameter of the output end of the drive motor 23.

[0042] The first retaining ring 271 and the second retaining ring 272, which are coaxial, are fixedly connected by the connecting rod 273. The second retaining ring 272 is used to abut against the inside of the smoke inlet pipe 25, which can provide convenient support for the drive motor 23. The output end of the drive motor 23 passes through the first retaining ring 271 and can drive the filter 22 to rotate more stably. The structure is simple, easy to disassemble and clean, and does not affect the flow of flue gas.

[0043] In some embodiments of the present invention, the top of the support base 24 is provided with a mounting base 241, and a rotating shaft 242 is fixedly inserted into the mounting base 241. The rotating shaft 242 is fixedly connected to the output end of the drive motor 23. A plurality of rotating rods 243 are provided on the shaft of the rotating shaft 242. The other end of the rotating rod 243 is fixedly connected to the inner wall of the filter 22. The rotation of the drive motor 23 drives the rotation of the rotating shaft 242. By fixing the rotating shaft 242 to the mounting base 241, the rotating shaft 242 drives the rotation of the support base 24. By fixing the rotating rods 243 to the filter 22, the filter 22 is prevented from being displaced when the support base 24 rotates, thus avoiding affecting the filtration efficiency of the oil fume.

[0044] The fan assembly 10 includes an upper housing 11, an impeller 12, a volute 13, a motor 14, and a lifting assembly 30. The top of the flue 25 is inserted into the inner cavity of the upper housing 11, the impeller 12 is installed in the volute 13, and the output end of the motor 14 is connected to the impeller 12.

[0045] The rotation of motor 14 drives the rotation of impeller 12, and the filtered smoke is discharged from the air outlet of upper housing 11 through the air duct of volute 13. A check valve 16 is provided on the air outlet of volute 13 to prevent backflow of oil fumes in public smoking areas. A sealing plate 17 is provided on the air outlet of upper housing 11. The electronic components inside the range hood are placed on the sealing plate 17 to avoid pollution from kitchen oil fumes and to help the electronic components avoid heat sources. This avoids the problem of temperature rise caused by high-temperature cooking, which could cause the internal precision parts of the electronic components to malfunction and pose certain safety hazards. A heat dissipation vent is also provided on the top of upper housing 11 to facilitate heat dissipation of electronic components, thereby enabling the range hood to operate better.

[0046] The lifting assembly 30 includes an electric telescopic rod 31. One end of the electric telescopic rod 31 is fixedly connected to the inner wall of the upper housing 11, and the output end of the electric telescopic rod 31 is fixedly connected to the outer wall of the smoke inlet pipe 25. The electric telescopic rods 31 are symmetrically arranged.

[0047] In some embodiments of the present invention, a fixing ring 28 is fitted on the outer wall of the smoke inlet pipe 25. The top of the fixing ring 28 is fixedly connected to the output end of the electric telescopic rod 31. A limiting block 32 is also provided above the fixing ring 28. A cylindrical hole 33 is opened on the limiting block 32. The end of the limiting block 32 away from the cylindrical hole 33 is fixedly connected to the outer wall of the smoke inlet pipe 25. The output end of the electric telescopic rod 31 passes through the cylindrical hole 33 and extends out to be fixedly connected to the fixing ring 28.

[0048] By fixing the electric telescopic rod 31 to the upper housing 11, the upper housing 11 supports the electric telescopic rod 31, making it easier for the output end of the electric telescopic rod 31 to move up and down by pulling the fixing ring 28, thereby driving the smoke collection hood 20 to move up and down.

[0049] By passing the electric telescopic rod 31 through the cylindrical hole 33 and fixing it with the limiting block 32, the electric telescopic rod 31 is limited when it moves, thus avoiding deviation. This makes the smoke inlet pipe 25 more stable when it moves up and down. The two electric telescopic rods 31 are symmetrically arranged, making the overall structure run more smoothly and with better performance.

[0050] In some embodiments of the present invention, a baffle 29 is fitted on the fume hood 20, and the body of the smoke inlet pipe 25 passes through the baffle 29. The outer peripheral wall diameter of the baffle 29 is larger than the outer peripheral wall diameter of the fume hood 20. The baffle 29 can block the rising oil fumes, slowing down the speed of the oil fumes, so that the oil fumes generated by the stove can be drawn into the filter 22 over a larger area for oil fume filtration. The baffle 29 is made of glass material. By using glass material for the baffle 29, its light transmission performance is better, avoiding the baffle 29 from blocking the upward lighting effect of the light strip 225, and it is also more convenient for users to clean.

[0051] In some embodiments of the present invention, the oil collection box 26 is conical, and the top diameter of the oil collection box 26 is smaller than the diameter of the air inlet screen 21. By using a conical oil collection box 26, oil can be collected more efficiently. Preferably, the oil collection box is equipped with a gravity sensor (not shown), a green indicator light (not shown), and a red indicator light (not shown). The gravity sensor can accurately sense the amount of oil stored in the oil collection box 26 and convert the received signal into a corresponding value (a corresponding number within 10). The indicator light corresponds to the value. When the value is less than 7, the green indicator light is displayed. When the value is greater than 7, a red indicator light is displayed, allowing users to more intuitively understand the oil storage capacity of the oil collection box 26 based on different lights. For example, when the oil storage capacity of the oil collection box 26 is low, the weight is 3, and the corresponding indicator light is green. After a period of use, the oil storage capacity of the oil collection box 26 increases, and when the value converted by the gravity sensor is 8, the corresponding red light is lit. This can more intuitively remind users to clean the oil stains in the oil collection box in time, avoiding the situation where the transparent window is dark and the specific oil collection height inside is not clear, which would affect the user experience after a long time.

[0052] In some embodiments of the present invention, the bottom of the upper housing 11 is provided with a movable groove 112, the top end of the smoke inlet pipe 25 passes through the movable groove 112, the fixing ring 28 is located between the volute 13 and the movable groove 112, and an annular groove 113 is provided on the inner wall of the movable groove 112. A sealing gasket 114 is provided in the annular groove 113. The sealing gasket 114 provided in the movable groove 112 can make the channel between the smoke inlet pipe 25 and the upper housing 11 better when the smoke inlet pipe 25 moves up and down, which is conducive to the extraction of oil fumes and prevents the oil fumes in the flue from flowing out from the gap between the movable groove 112 and the smoke inlet pipe 25, so that the oil fumes cannot be discharged from the room more quickly, producing bad odors and affecting the comfort of living.

[0053] The workflow is as follows:

[0054] When cooking, the range hood is turned on, and the motor 14 drives the impeller 12 to rotate, creating a negative pressure in the area above the opening of the smoke inlet pipe 25. Through the guidance of the spiral filter 22 inside the smoke collection hood 20, a negative pressure zone is formed within a certain space above the stove. The surrounding cooking fumes are attracted by this negative pressure and enter through the air inlet 211 of the air inlet mesh 21 and through the air inlet 222 into the spiral air passage of the spiral filter 22. The rotation of the drive motor 23 drives the support base 24 and the filter 22 to rotate together, thereby driving the spiral... The gas in the cyclone channel also rotates synchronously. The oil fume gas is subjected to centrifugal force, which throws the larger oil fume particles onto the housing of the filter 22. After accumulating to a certain weight, they slide down under the action of gravity and fall into the oil drain hole 245. Utilizing the vibration, friction, and squeezing generated when the filter 22 rotates, as well as the weight of the filter 22 itself, the oil in the slide groove 244 can be squeezed out of the slide groove 244 through the oil drain hole 245 as quickly as possible. This allows for more efficient discharge of the oil into the oil collection box 26, making it convenient for users to clean.

[0055] By utilizing the high-speed rotation of the impeller 12 of the fan, the flue gas undergoes secondary centrifugal filtration. The oily fumes are once again thrown out of the impeller 12 by centrifugal force, and the oil and fumes are separated again. The separated oil flows into the oil collection box 26 through the oil guiding system. The purified flue gas is then discharged through the air outlet. After the oil and fumes in the room are separated by the range hood, the odor is greatly reduced, the air is purified, and the quality of life for users is improved. Moreover, the air discharged outdoors will not cause pollution to the environment because the oil and fumes have been separated.

[0056] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A ceiling-mounted range hood, characterized in that, include: Fan assembly (10) and smoke hood (20) located below the fan assembly (10); The smoke hood (20) includes an air inlet screen (21), a spiral filter (22), a drive motor (23) for driving the filter (22), a support base (24), a smoke inlet pipe (25), and an oil collection box (26). The filter (22) is located inside the air inlet screen (21), and the bottom of the filter (22) is inserted into the support base (24). The top of the support base (24) is provided with a mounting seat (241), and a rotating shaft (242) is fixedly inserted into the mounting seat (241). The shaft (242) is fixedly connected to the output end of the drive motor (23). Multiple rotating rods (243) are provided on the shaft (242). The other end of the rotating rod (243) is fixedly connected to the inner wall of the filter (22). The drive motor (23) is connected to the inner wall of the smoke inlet pipe (25). The bottom of the smoke inlet pipe (25) is connected to the top of the air inlet screen (21) by screws. The oil collection box (26) is located below the support base (24). The oil collection box (26) is connected to the air inlet screen (21). The fan assembly (10) includes an upper housing (11), an impeller (12), a volute (13), a motor (14), and a lifting assembly (30). The top of the smoke inlet pipe (25) is inserted into the inner cavity of the upper housing (11). The impeller (12) is installed in the volute (13). The output end of the motor (14) is connected to the impeller (12). The lifting assembly (30) includes an electric telescopic rod (31). One end of the electric telescopic rod (31) is fixedly connected to the inner wall of the upper housing (11), and the output end of the electric telescopic rod (31) is fixedly connected to the outer wall of the smoke inlet pipe (25).

2. The ceiling-mounted range hood according to claim 1, characterized in that, The support base (24) is provided with a V-shaped groove (244), and the bottom of the filter (22) is provided with a slider (223) that cooperates with the groove (244). The opening of the groove (244) is larger than the diameter of the slider (223). The bottom of the groove (244) is provided with an oil leakage hole (245), and the oil leakage hole (245) is connected to the oil collection box (26).

3. A ceiling-mounted range hood according to claim 1, characterized in that, The bottom of the drive motor (23) is provided with a fixing frame (27). The fixing frame (27) includes a first retaining ring (271), a second retaining ring (272), and a connecting rod (273) installed between the first retaining ring (271) and the second retaining ring (272). The drive motor (23) is installed on the top of the first retaining ring (271). The output end of the drive motor (23) passes through the first retaining ring (271). The outer wall of the second retaining ring (272) abuts against the inner wall of the smoke inlet pipe (25). The diameter of the end of the second retaining ring (272) near the filter (22) is larger than the diameter of the other end. The diameter of the first retaining ring (271) is smaller than the diameter of the second retaining ring (272). The diameter of the first retaining ring (271) is larger than the diameter of the output end of the drive motor (23).

4. A ceiling-mounted range hood according to claim 1, characterized in that, The air inlet screen (21) is a cylindrical tube, and the outer peripheral wall of the air inlet screen (21) is provided with a number of air inlet holes (211). The air inlet holes (211) are connected to the air inlet (222) of the filter (22). The bottom of the smoke inlet pipe (25) is provided with a ring light strip (225).

5. The ceiling-mounted range hood according to claim 1, characterized in that, A fixing ring (28) is fitted on the outer wall of the smoke inlet pipe (25). The top of the fixing ring (28) is fixedly connected to the output end of the electric telescopic rod (31). A limiting block (32) is also provided above the fixing ring (28). A cylindrical hole (33) is opened on the limiting block (32). The end of the limiting block (32) away from the cylindrical hole (33) is fixedly connected to the outer wall of the smoke inlet pipe (25). The output end of the electric telescopic rod (31) passes through the cylindrical hole (33) and extends out to be fixedly connected to the fixing ring (28).

6. A ceiling mounted extractor hood as claimed in claim 1, characterised in that A baffle (29) is fitted on the smoke collection hood (20), and the body of the smoke inlet pipe (25) passes through the baffle (29). The outer peripheral wall diameter of the baffle (29) is larger than the outer peripheral wall diameter of the smoke collection hood (20). The baffle (29) is made of glass.

7. A ceiling-mounted range hood according to claim 1, characterized in that, The oil collection box (26) is conical, and the top diameter of the oil collection box (26) is smaller than the diameter of the air inlet screen (21).

8. A ceiling mounted extractor hood as claimed in claim 5, characterised in that The bottom of the upper housing (11) is provided with a movable groove (112), the top end of the smoke inlet pipe (25) passes through the movable groove (112), the fixed ring (28) is located between the volute (13) and the movable groove (112), an annular groove (113) is provided on the inner wall of the movable groove (112), and a sealing gasket (114) is provided in the annular groove (113).

9. A ceiling mounted extractor hood as claimed in claim 1, characterised in that The filter (22) is provided with an elastic gasket (221) on top, and the elastic gasket (221) is O-shaped.

Images