Valve structure for a multi-flue extractor hood

Abstract

This invention discloses a valve structure for a multi-duct range hood, relating to the field of exhaust valve technology. It includes a base, a valve body fixedly mounted on the top of the base, a support ring mounted on the inner wall of the valve body, a central axis plate mounted on the top of the support ring, and two ends of the central axis plate fixedly mounted on the inner wall of the valve body. Opening and closing plates are movably mounted on both sides of the central axis plate. In use, the structure utilizes a rotating shaft on a centrifugal assembly, which drives the centrifugal components for adjustment. When the pendulum ball on the centrifugal components is adjusted, it causes the bottom support plate to rise via a pull rod. Simultaneously, the sliding plate pushes the opening and closing plates to open, allowing the mechanical force to adjust the opening and closing plates during range hood operation, preventing insufficient oil fume transmission pressure from causing difficulty in opening the plates.

Description

Technical Field

[0001] This invention relates to the field of exhaust valve technology, specifically a valve structure for multi-duct range hoods. Background Technology

[0002] With the development of kitchen appliance technology, multi-duct range hoods are widely used because of their wider range of oil fume capture. In this multi-duct structure, a one-way valve structure is usually installed at the junction of each branch duct or the main exhaust outlet to discharge oil fumes while preventing backflow of oil fumes. In current valve usage, the pressure from the transmission of cooking fumes is typically used to open the valve's control plate, allowing the fumes to be transported into the exhaust duct for smoke extraction. However, in actual use, grease from the fumes adheres to the inside of the valve and its control plate. This grease buildup causes the control plate and the valve's support ring to stick together. Consequently, it becomes difficult to open the control plate using the pressure from the transmission of cooking fumes, making it difficult to open or even impossible to open under low-power operation. Therefore, this invention provides a valve structure for multi-duct range hoods to solve the aforementioned problems. Summary of the Invention

[0003] The purpose of this invention is to provide a valve structure for multi-duct range hoods to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: A valve structure for a multi-duct range hood includes a base, a valve body fixedly mounted on the top of the base, a support ring mounted on the inner side wall of the valve body, a central shaft plate mounted on the top of the support ring, two ends of the central shaft plate fixedly mounted on the inner wall of the valve body, and opening and closing plates movably mounted on both sides of the central shaft plate. A centrifugal assembly is installed at the bottom of the support ring. The centrifugal assembly includes a rotating shaft, a base plate, and a centrifugal component. One end of the centrifugal component is fixedly installed on the top of the rotating shaft, and the other end of the centrifugal component is movably connected to the base plate. The base plate is fitted onto the bottom of the rotating shaft and can be adjusted up and down on the rotating shaft. A sleeve groove is provided on the side wall of the base plate, and a sleeve plate is fitted onto the sleeve groove. Fixed base plates are fixedly installed at both ends of the sleeve plate corresponding to the opening and closing plate positions. A pusher is fixedly installed on the top of the fixed base plate. A drive assembly is installed at the bottom of the centrifugal assembly, and the shaft and the output end of the drive assembly are connected to each other. Actuating components are installed on both sides of the centrifugal assembly corresponding to the opening and closing plate positions. The actuating components are fixedly connected to the inner wall of the valve body. The actuating components include a fixing rod, and the fixing rod is fixedly connected to the fixing base plate. The support ring includes a main body and an adjusting component. The adjusting component is movably installed inside the main body and includes a drive disc, which is fixedly connected to the top of the rotating shaft.

[0005] As a further embodiment of the present invention, the centrifugal component includes a top support plate, which is fixedly installed at the top of the rotating shaft. Connecting rods are movably installed at both ends of the top support plate. A pendulum ball is fixedly installed at the bottom of the connecting rod. Pull rods are movably installed on one side of the two sets of connecting rods that are close to each other. The bottom end of the pull rod is movably installed at the top of the bottom support plate.

[0006] As a further embodiment of the present invention, a top baffle is fixedly installed on the rotating shaft, the top baffle is located above the bottom support plate, and an elastic adjustment component is fixedly installed at the bottom of the top baffle, with the end of the elastic adjustment component away from the top baffle fixedly installed at the top of the bottom support plate.

[0007] As a further embodiment of the present invention, the actuating assembly includes two sets of side plates, which are fixedly installed on the inner wall of the valve body. An actuating plate is movably installed on one side of the two sets of side plates that are close to each other. The actuating plate is located on the side of the side plate away from the inner wall of the valve body. An adjustment groove is provided on the actuating plate. Movable base blocks are movably installed on the side of the two sets of side plates that are close to each other and on both sides of the actuating plate. A spring-loaded reset component is fixedly installed between the two sets of movable base blocks on the same side of the side plate and the actuating plate.

[0008] As a further embodiment of the present invention, a control plate is installed on the adjustment groove, and adjustment blocks are fixedly installed on the top and bottom ends of both sides of the control plate. The control plate is fixedly connected to the fixing rod on the side near the fixed base plate.

[0009] As a further embodiment of the present invention, the main body includes a bottom ring, a base ring is fixedly installed on the top of the bottom ring, an auxiliary groove is provided at intervals on the top of the base ring, a pad ring is installed on the base ring, the pad ring is located in the auxiliary groove and the pad ring is circumferentially penetrating the side wall of the auxiliary groove, a cleaning groove is provided on the inner side of the base ring in the area between the two sets of auxiliary grooves, and a cleaning scraper is fixedly installed on the inner side of the cleaning groove.

[0010] As a further embodiment of the present invention, a waste groove is provided on the inner side of the bottom ring, and the waste groove penetrates the side wall of the bottom ring and the valve body. A cleaning baffle is detachably installed on the outer wall of the valve body corresponding to the position of the waste groove. The adjusting member and the gasket are connected to each other.

[0011] As a further embodiment of the present invention, the adjusting component further includes a central support plate, the two ends of which are fixedly installed on the inner wall of the base ring. The central support plate is located below the central shaft plate. A transmission groove is formed on the inner side of the central support plate. The active disc is fixedly installed on the inner side of the transmission groove corresponding to the centrifugal component position. A limit ring is installed on the inner side of the cleaning groove. An adjusting ring is installed on the inner side of the limit ring. The top end of the adjusting ring slides through the top of the limit ring and the bottom of the pad ring and is fixedly connected to each other. Teeth are installed around the inner ring of the adjusting ring.

[0012] As a further embodiment of the present invention, a driven wheel is movably installed on the inner side of the transmission groove near the adjusting ring, and teeth capable of meshing with the adjusting ring are installed around the outer ring of the driven wheel. A transmission belt is fitted between the driving disc and the driven wheel.

[0013] Compared with the prior art, the beneficial effects of the present invention are: 1. When the structure of the present invention is in use, the rotating shaft on the centrifugal assembly rotates, which drives the centrifugal component to adjust. When the pendulum ball on the centrifugal component is adjusted, it drives the bottom support plate to rise through the pull rod. Under the synchronous operation of the sleeve plate, the pushing component pushes the opening and closing plate to open. This allows the opening and closing plate to be adjusted by mechanical pushing force when the range hood is in operation, avoiding the situation where the opening and closing plate is difficult to open due to insufficient oil fume transmission pressure. 2. When the structure of the present invention is in use, the control plate can be effectively moved upward by the fixed base plate, which in turn moves the control plate upward in the adjustment groove. This causes the adjustment block to rotate the actuating plate upward. When the actuating plate rotates to the critical point, the actuating plate will generate an instantaneous upward striking force through the elastic force of the elastic reset component. This effectively reduces the adhesion strength between the opening and closing plate and the support ring, making it easier to open smoothly under low power operation and reducing the difficulty of opening. 3. When using the structure of this invention, the adjusting component allows the gasket to rotate on the base ring. The cleaning scraper will limit and squeeze the top of the gasket, so that the oil stains attached to the gasket are cleaned in the cleaning groove. The cleaned oil stains will fall into the waste trough, thereby effectively cleaning the oil stains attached to the support ring and avoiding the situation where large-area oil stains stick together, which would increase the adhesion strength between the opening and closing plate and the support ring. This effectively reduces the adhesion strength between the opening and closing plate and the support ring, making it easier for the opening and closing plate to open smoothly in subsequent operations. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of a valve structure for a multi-duct range hood.

[0015] Figure 2 This is a partial cross-sectional view of the valve body in a valve structure used in a multi-duct range hood.

[0016] Figure 3 This is a partial structural diagram of the centrifugal component in a valve structure for a multi-duct range hood.

[0017] Figure 4 This is a partial structural diagram of the actuating component in a valve structure used in a multi-duct range hood.

[0018] Figure 5 This is a partial structural diagram of a support ring in a valve structure used in a multi-duct range hood.

[0019] Figure 6 This is a partial cross-sectional view of the base ring in a valve structure for a multi-duct range hood.

[0020] Figure 7 This is a schematic diagram of a partially disassembled limiting retaining ring in a valve structure used in a multi-duct range hood.

[0021] Figure 8 This is a partial cross-sectional view of the gearbox in a valve structure for a multi-duct range hood.

[0022] In the diagram: 1. Base; 2. Valve body; 3. Drive motor; 4. Cleaning baffle; 5. Central shaft plate; 6. Opening and closing plate; 7. Support ring; 8. Centrifugal assembly; 9. Actuating assembly; 10. Gearbox; 11. Drive shaft; 12. Rotating shaft; 13. Top support plate; 14. Top baffle; 15. Bottom support plate; 16. Elastic adjustment component; 17. Sleeve groove; 18. Connecting rod; 19. Pendulum ball; 20. Pull rod; 21. Sleeve plate; 22. Fixed base plate; 23. Pushing component; 24. Side 25. Plate; 26. Actuating plate; 27. Adjusting groove; 28. Fixing rod; 29. ​​Control plate; 30. Adjusting block; 31. Movable base block; 32. Spring reset component; 33. Base ring; 34. Middle support plate; 35. Auxiliary groove; 36. Washer ring; 37. Bottom ring; 38. Waste trough; 39. Cleaning scraper; 40. Transmission groove; 41. Drive disc; 42. Transmission belt; 43. Limiting ring; 44. Adjusting ring; 45. Driven wheel; 46. Meshing gear. Detailed Implementation

[0023] 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 of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0024] Please see Figures 1-8In this embodiment of the invention, a valve structure for a multi-duct range hood includes a base 1, a valve body 2 fixedly mounted on the top of the base 1, and mounting holes for easy disassembly and installation on the base 1. The base 1 is detachably mounted on the multi-duct confluence of the range hood via a threaded assembly and mounting holes. The top of the valve body 2 is also provided with mounting holes for easy disassembly and installation. The exhaust pipe is mounted on the top of the valve body 2 via a bolt assembly. A support ring 7 is installed on the inner wall of the valve body 2. A central shaft plate 5 is installed on the top of the support ring 7. The two ends of the central shaft plate 5 are fixedly installed on the inner wall of the valve body 2. Opening and closing plates 6 are movably installed on both sides of the central shaft plate 5. The opening and closing plates 6 can open and close on the central shaft plate 5. The bottom of the opening and closing plates 6 and the support ring 7 fit together. When the range hood is started, the exhaust fumes will push the opening and closing plates 6, causing the opening and closing plates 6 to rotate on the central shaft plate 5 and open upward, so that the fumes are transmitted into the exhaust pipe through the opening and closing gap of the opening and closing plates 6, thereby completing the exhaust operation.

[0025] A centrifugal assembly 8 is installed at the bottom of the support ring 7. The centrifugal assembly 8 includes a rotating shaft 12, a bottom support plate 15, and a centrifugal component. One end of the centrifugal component is fixedly installed on the top of the rotating shaft 12, and the other end of the centrifugal component is movably connected to the bottom support plate 15. The bottom support plate 15 is fitted onto the bottom of the rotating shaft 12 and can be adjusted in height on the rotating shaft 12. A groove 17 is provided on the side wall of the bottom support plate 15, and a sleeve plate 21 is fitted onto the groove 17. The sleeve plate 21 can rotate on the groove 17, and corresponding openings are provided at both ends of the sleeve plate 21. A fixed base plate 22 is fixedly installed at the position of the hinge plate 6. A pusher 23 is fixedly installed on the top of the fixed base plate 22. The pusher 23 is an inverted "U" shaped plate with an arc-shaped top. An elastic buffer block is installed on the pusher 23. The elastic buffer block allows the pusher 23 to adjust and buffer the force when it is obstructed in pushing the hinge plate 6. The top of the pusher 23 and the bottom of the hinge plate 6 fit together. A drive assembly is installed at the bottom of the centrifugal assembly 8. The rotating shaft 12 and the output end of the drive assembly are connected to each other. The drive assembly drives the rotating shaft 12 to rotate, causing the centrifugal component to drive the bottom support plate 15 to rise on the rotating shaft 12, which in turn causes the sleeve plate 21 to drive the pusher 23 to rise inside the valve body 2, causing the pusher 23 to push the bottom of the opening and closing plate 6, causing the opening and closing plate 6 to rotate and open on the central shaft plate 5. The centrifugal component includes a top support plate 13, which is fixedly installed on the top of the rotating shaft 12. Both ends of the top support plate 13 are movably mounted with connecting rods 18, which can rotate on the top support plate 13. A pendulum ball 19 is fixedly installed at the bottom of the connecting rods 18. A pull rod 20 is movably mounted on one side of each of the two sets of connecting rods 18. The bottom end of the pull rod 20 is movably mounted on the top of the bottom support plate 15. Both ends of the pull rod 20 can be rotated and adjusted on the connecting rods 18 and the bottom support plate 15, respectively, and the top end of the pull rod 20 is located above the pendulum ball 19. Rotating via the pivot 12, under the action of centrifugal force, the two sets of pendulum balls 19 will be lifted and rotated on the top support plate 13 via the connecting rod 18, and then the bottom support plate 15 will be raised and adjusted via the pull rod 20.

[0026] A top baffle 14 is fixedly installed on the rotating shaft 12. The top baffle 14 is located above the bottom support plate 15. A spring adjustment component 16 is fixedly installed at the bottom of the top baffle 14. The end of the spring adjustment component 16 away from the top baffle 14 is fixedly installed at the top of the bottom support plate 15. The elastic adjustment element 16 enables the base plate 15 to rise stably on the rotating shaft 12, and can quickly drive the base plate 15 to reset after the rotating shaft 12 stops rotating, reducing the occurrence of reset resistance.

[0027] Actuating components 9 are installed on both sides of the centrifugal assembly 8 corresponding to the opening and closing plates 6. The actuating components 9 and the inner wall of the valve body 2 are fixedly connected to each other. The actuating components 9 include two sets of side plates 24. The side plates 24 are fixedly installed on the inner wall of the valve body 2. An actuating plate 25 is movably installed on one side of the two sets of side plates 24 close to each other. The actuating plate 25 is located on the side of the side plate 24 away from the inner wall of the valve body 2. An adjusting groove 26 is opened on the actuating plate 25. Movable base blocks 30 are movably installed on the one side of the two sets of side plates 24 close to each other and on both sides of the actuating plate 25. The movable base blocks 30 can rotate on the side plates 24 and the actuating plate 25. A spring reset member 31 is fixedly installed between the two sets of movable base blocks 30 on the same side of the side plates 24 and the actuating plate 25. In the initial state, the actuating plate 25 is installed at an angle between the two sets of side plates 24, and the end of the actuating plate 25 near the inner wall of the valve body 2 is located below the side plate 24. The corresponding spring reset member 31 is installed at an angle on both sides of the actuating plate 25. At this time, the spring force of the spring reset member 31 is in a balanced state. When the actuating plate 25 is rotated upward, the actuating plate 25 will pull the spring reset member 31 for adjustment. When the end of the actuating plate 25 near the inner wall of the valve body 2 is rotated to the position above the side plate 24, the spring reset member 31 will drive the actuating plate 25 to rotate rapidly through the spring force adjustment, which will then apply instantaneous force to the opening and closing plate 6, making it easier for the opening and closing plate 6 and the support ring 7 to separate. It should be noted that when the opening and closing plate 6 and the support ring 7 are bonded together by grease, when the opening and closing plate 6 is subjected to an instantaneous impact force, the bonding strength between the opening and closing plate 6 and the support ring 7 will be reduced, making it easier for the opening and closing plate 6 to open subsequently.

[0028] A control plate 28 is installed on the adjustment groove 26. Adjustment blocks 29 are fixedly installed on the top and bottom of both sides of the control plate 28. A fixing rod 27 is fixedly installed on the side of the control plate 28 near the fixed base plate 22. The fixing rod 27 and the fixed base plate 22 are fixedly connected to each other. The rise of the fixed base plate 22 causes the control plate 28 to rise synchronously, so that the adjustment block 29 on the control plate 28 will adjust the toggle plate 25 upward, thereby driving the toggle plate 25 to rotate and adjust. Similarly, when the fixed base plate 22 falls, the adjustment block 29 on the control plate 28 will adjust the toggle plate 25 downward, thereby driving the toggle plate 25 to reset and rotate and adjust.

[0029] By means that the striking end of the actuating plate 25 is located on the side close to the inner wall of the valve body 2, when the actuating plate 25 and the opening and closing plate 6 come into contact, an upward force is applied to the bottom of the opening and closing plate 6 and towards the side close to the central shaft plate 5, so that the opening and closing plate 6 is subjected to the same force as the opening angle, making it easier for the opening and closing plate 6 and the support ring 7 to separate.

[0030] The support ring 7 includes a main body and an adjusting component. The adjusting component is movably installed within the main body. The main body includes a bottom ring 36, with a base ring 32 fixedly mounted on the top of the bottom ring 36. Auxiliary grooves 34 are spaced apart at the top of the base ring 32. A washer ring 35 is mounted on the base ring 32, located within the auxiliary grooves 34, and annularly penetrating the sidewall of the auxiliary groove 34, allowing the washer ring 35 to rotate on the base ring 32 and to adjust its deformation. A cleaning groove 38 is formed on the inner side of the base ring 32 between the two sets of auxiliary grooves 34. A cleaning scraper 39 is fixedly mounted inside the cleaning groove 38. The bottom of the cleaning scraper 39 presses against the top of the washer ring 35, causing the washer ring 35 to deform under pressure. The top of the gasket 35 and the top of the base ring 32 are on the same plane. A waste groove 37 is provided on the inner side of the bottom ring 36, and the waste groove 37 penetrates the bottom ring 36 and the side wall of the valve body 2. A cleaning baffle 4 is detachably installed on the outer wall of the valve body 2 corresponding to the position of the waste groove 37. The adjusting component and the gasket 35 are connected to each other. The adjusting component allows the gasket 35 to rotate on the base ring 32. The cleaning scraper 39 will limit and squeeze the top of the gasket 35, so that the oil stains attached to the gasket 35 are cleaned in the cleaning groove 38. The cleaned oil stains will fall into the waste groove 37, thereby effectively cleaning the oil stains attached to the support ring 7 and avoiding the situation where the opening and closing plate 6 cannot be opened due to the large area of ​​oil stains sticking together.

[0031] The adjusting component includes a central support plate 33, with both ends of the central support plate 33 fixedly installed on the inner wall of the base ring 32. The central support plate 33 is located below the central shaft plate 5. A transmission groove 40 is formed on the inner side of the central support plate 33. An active disc 41 is installed on the inner side of the transmission groove 40 corresponding to the position of the centrifugal assembly 8. The active disc 41 and the top of the rotating shaft 12 are fixedly connected to each other. A limit ring 43 is installed on the inner side of the cleaning groove 38. An adjusting ring 44 is installed on the inner side of the limit ring 43. The top of the adjusting ring 44 slides through the top of the limit ring 43 and the bottom of the pad ring 35 and is fixedly connected to each other. The inner ring of the adjusting ring 44... The drive ring 45 is movably mounted on the inner side of the transmission groove 40 near the adjusting ring 44, and the driven ring 45 can rotate in the transmission groove 40. The outer ring of the driven ring 45 is equipped with teeth that can mesh with the adjusting ring 44. A transmission belt 42 is fitted between the drive disc 41 and the driven ring 45. The rotation of the drive disc 41 through the transmission belt 42 can drive the driven ring 45 to rotate, which in turn drives the adjusting ring 44 to rotate in the cleaning groove 38, so that the pad ring 35 can rotate on the base ring 32.

[0032] The drive assembly includes a drive motor 3 and a gearbox 10. The gearbox 10 is fixedly installed inside the valve body 2 and is located below the centrifugal assembly 8. Meshing gears 46 are installed inside the gearbox 10 corresponding to the positions of the centrifugal assembly 8 and the drive motor 3. A drive shaft 11 is fixedly installed on the output end of the drive motor 3. The drive shaft 11 slides through the side wall of the valve body 2 and the gearbox 10 and is fixedly connected to the meshing gears 46 at the corresponding positions inside the gearbox 10. The bottom end of the rotating shaft 12 on the centrifugal assembly 8 slides through the gearbox 10 and is fixedly connected to the top of the meshing gears 46. The input end of the drive motor 3 is connected to the control end of the range hood. The drive motor 3 can be started by starting the range hood. The output speed of the drive motor 3 can be adjusted by adjusting the range hood speed.

[0033] The drive motor 3 can be started to drive the drive shaft 11 to rotate. Under the adjustment of the two sets of meshing gears 46, the rotating shaft 12 can be rotated, thereby allowing the centrifugal components on the centrifugal assembly 8 to be adjusted.

[0034] The working principle of this invention is: When using the structure of this invention, the base 1 is installed on the range hood using bolt assemblies, and the exhaust pipe is installed on the valve body 2 using bolt assemblies. When the range hood is started, the drive motor 3 will start synchronously. Under the adjustment of the two sets of meshing gears 46, the rotating shaft 12 on the centrifugal assembly 8 will rotate, causing the rotating shaft 12 to drive the centrifugal component to rotate, thereby causing the bottom support plate 15 to drive the sleeve plate 21 and the pusher 23 to rise in the valve body 2, pushing the opening and closing plate 6, so that the opening and closing plate 6 can rotate and open on the central shaft plate 5, allowing the fumes to be transmitted and discharged into the exhaust pipe through the opening channel. When the fixed base plate 22 rises, the control plate 28 can be driven to rise synchronously through the fixed rod 27, so that the adjustment block 29 at the bottom of the control plate 28 pushes the actuating plate 25 to rise and rotate. When the actuating plate 25 rotates above the side plate 24, the actuating plate 25 is driven to strike the opening and closing plate 6 with elastic force through the elasticity adjustment of the elastic reset member 31, thereby loosening the connection between the opening and closing plate 6 and the support ring 7, so that the push member 23 can push the opening and closing plate 6 to open, or the airflow transmission pressure can push the opening and closing plate 6 to open.

[0035] When the shaft 12 rotates, it drives the driven wheel 45 to rotate through the drive disc 41 and the transmission belt 42, which in turn causes the adjusting ring 44 to rotate and adjust within the cleaning groove 38, allowing the pad ring 35 to rotate on the base ring 32. The cleaning scraper 39 will squeeze and scrape the top of the pad ring 35 during its rotation, effectively cleaning the oil stains on the pad ring 35 and retaining them in the cleaning groove 38. Subsequently, the waste tank 37 can be cleaned by disassembling the cleaning baffle 4.

[0036] 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 valve structure for a multi-duct range hood, comprising a base (1), wherein a valve body (2) is fixedly mounted on the top of the base (1), characterized in that: A support ring (7) is installed on the inner wall of the valve body (2). A central shaft plate (5) is installed at the top of the support ring (7). Both ends of the central shaft plate (5) are fixedly installed on the inner wall of the valve body (2). Opening and closing plates (6) are movably installed on both sides of the central shaft plate (5). The bottom of the support ring (7) is equipped with a centrifugal assembly (8). The centrifugal assembly (8) includes a rotating shaft (12), a bottom support plate (15), and a centrifugal component. One end of the centrifugal component is fixedly installed on the top of the rotating shaft (12), and the other end of the centrifugal component is movably connected to the bottom support plate (15). The bottom support plate (15) is fitted on the bottom of the rotating shaft (12). The bottom support plate (15) can be adjusted up and down on the rotating shaft (12). A sleeve groove (17) is provided on the side wall of the bottom support plate (15). A sleeve plate (21) is fitted on the sleeve groove (17). A fixed base plate (22) is fixedly installed at both ends of the sleeve plate (21) corresponding to the position of the opening and closing plate (6). A pusher (23) is fixedly installed on the top of the fixed base plate (22). The centrifugal assembly (8) is equipped with a drive assembly at its bottom, and the shaft (12) and the output end of the drive assembly are connected to each other. Both sides of the centrifugal assembly (8) are equipped with actuating components (9) corresponding to the opening and closing plates (6). The actuating components (9) and the inner wall of the valve body (2) are fixedly connected to each other. The actuating components (9) include a fixing rod (27). The fixing rod (27) and the fixing base plate (22) are fixedly connected to each other. The support ring (7) includes a main body and an adjusting component. The adjusting component is movably installed inside the main body and includes an active disc (41). The active disc (41) and the top of the rotating shaft (12) are fixedly connected to each other.

2. The valve structure for a multi-duct range hood according to claim 1, characterized in that: The centrifugal component includes a top support plate (13), which is fixedly installed on the top of the rotating shaft (12). Both ends of the top support plate (13) are movably installed with connecting rods (18). A pendulum ball (19) is fixedly installed at the bottom of the connecting rod (18). A pull rod (20) is movably installed on one side of the two sets of connecting rods (18) that are close to each other. The bottom end of the pull rod (20) is movably installed on the top of the bottom support plate (15).

3. The valve structure for a multi-duct range hood according to claim 2, characterized in that: A top baffle (14) is fixedly installed on the rotating shaft (12). The top baffle (14) is located above the bottom support plate (15). An elastic adjustment component (16) is fixedly installed at the bottom of the top baffle (14). The end of the elastic adjustment component (16) away from the top baffle (14) is fixedly installed at the top of the bottom support plate (15).

4. The valve structure for a multi-duct range hood according to claim 1, characterized in that: The actuation assembly (9) includes two sets of side plates (24). The side plates (24) are fixedly installed on the inner wall of the valve body (2). The two sets of side plates (24) are movably installed with a toggle plate (25) on one side close to each other. The toggle plate (25) is located on the side of the side plate (24) away from the inner wall of the valve body (2). An adjustment groove (26) is provided on the toggle plate (25). Movable base blocks (30) are movably installed on the side of the two sets of side plates (24) close to each other and on both sides of the toggle plate (25). A spring reset member (31) is fixedly installed between the two sets of movable base blocks (30) on the same side of the side plate (24) and the toggle plate (25).

5. A valve structure for a multi-duct range hood according to claim 4, characterized in that: A control plate (28) is installed on the adjustment groove (26). Adjustment blocks (29) are fixedly installed on the top and bottom of both sides of the control plate (28). The control plate (28) is fixedly connected to the fixed rod (27) on the side near the fixed base plate (22).

6. The valve structure for a multi-duct range hood according to claim 1, characterized in that: The main body includes a bottom ring (36), a base ring (32) is fixedly installed on the top of the bottom ring (36), an auxiliary groove (34) is provided at intervals on the top of the base ring (32), a pad ring (35) is installed on the base ring (32), the pad ring (35) is located in the auxiliary groove (34), and the pad ring (35) is circumferentially penetrating the side wall of the auxiliary groove (34). A cleaning groove (38) is provided in the area between the two sets of auxiliary grooves (34) on the inner side of the base ring (32), and a cleaning scraper (39) is fixedly installed on the inner side of the cleaning groove (38).

7. A valve structure for a multi-duct range hood according to claim 6, characterized in that: The bottom ring (36) has a waste groove (37) on its inner side, and the waste groove (37) penetrates the bottom ring (36) and the side wall of the valve body (2). A cleaning baffle (4) is detachably installed on the outer wall of the valve body (2) corresponding to the waste groove (37). The adjusting component and the gasket (35) are connected to each other.

8. A valve structure for a multi-duct range hood according to claim 6, characterized in that: The adjusting component also includes a central support plate (33), the two ends of which are fixedly installed on the inner wall of the base ring (32). The central support plate (33) is located below the central shaft plate (5). A transmission groove (40) is provided on the inner side of the central support plate (33). The active disc (41) is fixedly installed on the inner side of the transmission groove (40) corresponding to the position of the centrifugal component (8). A limit ring (43) is installed on the inner side of the cleaning groove (38). An adjusting ring (44) is installed on the inner side of the limit ring (43). The top end of the adjusting ring (44) slides through the top of the limit ring (43) and the bottom of the pad ring (35) and is fixedly connected to each other. Teeth are installed around the inner ring of the adjusting ring (44).

9. A valve structure for a multi-duct range hood according to claim 8, characterized in that: A driven wheel (45) is movably installed on the inner side of the transmission groove (40) near the adjusting ring (44). The outer ring of the driven wheel (45) is surrounded by teeth that can mesh with the adjusting ring (44). A transmission belt (42) is fitted between the driving disc (41) and the driven wheel (45).

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