A fan system for a range hood and a range hood

Abstract

This invention relates to the field of fan system technology, and proposes a fan system and a range hood for cooking hoods. It is compatible with range hoods, forming a bidirectional airflow structure. While ensuring normal smoke extraction operation of the range hood, it allows for the installation of an active air supply duct on the stove surface, creating a dual smoke extraction mode combining blowing and suction. This effectively improves smoke extraction efficiency, significantly reduces smoke overflow and leakage, and enhances overall practicality. The system includes a fan assembly and an air blowing duct connected to two quick-connect pipes. The fan assembly includes a support mounting frame, a fixedly connected partition frame, and a rotatably connected exhaust fan. A ring fan is rotatably connected to the partition frame. A variable frequency motor is mounted on the support mounting frame for synchronous drive of the exhaust fan and the ring fan. An extended contact ring is fixedly connected to the support mounting frame, and a rotation seal is provided between the extended contact ring and the ring fan.

Description

Technical Field

[0001] This invention relates to the field of fan system technology, specifically to a fan system for a range hood and a range hood. Background Technology

[0002] As is well known, the fan system of a range hood refers to the functional part that provides negative pressure suction for the range hood. It uses a motor to drive the impeller to rotate and generate airflow, which quickly sucks up the oil fumes and exhaust gases produced during kitchen cooking and discharges them outdoors.

[0003] A search revealed that Chinese patent application number CN202321043345.6 discloses a fan system for a range hood and a range hood. The system generally includes a volute with an air inlet on its side wall; and a baffle plate disposed on the side wall of the volute, which can be positioned close to or away from the air inlet. The baffle plate, depending on its position, can either block a portion of the air inlet or be hidden off-center from it. In use, the fan system can adapt to different operating conditions of the range hood, achieving optimal air intake conditions at the air inlet.

[0004] While the aforementioned existing technical solutions provide a fan system and a range hood, their fan system is similar to most products on the market, which directly exhausts smoke using a negative pressure method. However, in practice, to accommodate the storage space for pots and the operating space during cooking, a sufficient height difference is usually required between the range hood and the stove. Furthermore, the sources of smoke on the stove are quite numerous, and the range hood's ability to recover smoke emitted from farther locations is weaker. Therefore, the smoke extraction effect needs to be further improved. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a fan system for a range hood and a range hood that can be adapted to and used with the range hood to form a two-way air path structure. While ensuring the normal smoke exhaust operation of the range hood, an active air supply duct can be laid on the stove surface to construct a dual smoke exhaust mode that combines blowing and suction, effectively improving the efficiency of smoke exhaust and significantly reducing the phenomenon of smoke overflow and leakage. Overall, it is more practical to use.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a fan system for a range hood, comprising a fan assembly and an air blowing pipe, wherein the air blowing pipe is connected to two quick-connect pipes; the fan assembly includes a support mounting frame, wherein a partition frame is fixedly connected to the support mounting frame, an exhaust fan is rotatably connected to the support mounting frame, and an annular fan is rotatably connected to the partition frame; a variable frequency motor is mounted on the support mounting frame, the variable frequency motor being used for synchronous driving of the exhaust fan and the annular fan; an extended contact ring is fixedly connected to the support mounting frame, a rotation seal is provided between the extended contact ring and the annular fan; an external exhaust pipe is fixedly connected to the top of the extended contact ring, and multiple air inlet pipes are connected to the extended contact ring; the external exhaust pipes are connected to the partition frame, and a gradient air collection hood is fixedly connected to the bottom of the partition frame; two external exhaust channels are connected to the partition frame, and the two external exhaust channels are respectively connected to the two quick-connect pipes.

[0007] Preferably, the air blowing pipeline includes two lifting vertical pipes, which are respectively connected to two quick-connect pipes. Each lifting vertical pipe is fixedly connected to a fixed elbow. Each of the two fixed elbows is rotatably connected to a side equalization air pipe. Each of the two side equalization air pipes is rotatably connected to a connecting elbow. A front equalization air pipe is rotatably connected between the two connecting elbows. Both ends of the front equalization air pipe are equipped with linkage structures. Each of the two side equalization air pipes is matched with one of the two linkage structures. Each of the two lifting vertical pipes is provided with a pressing and limiting structure, which is matched with one of the two side equalization air pipes.

[0008] Preferably, both of the linkage structures include end rods, the two end rods are fixedly connected to the left and right ends of the front equalization pipe, the two side equalization pipes are fixedly connected to linkage rods, and the two linkage rods are rotatably connected to transmission frames, the two transmission frames are rotatably connected to the two end rods respectively.

[0009] Preferably, both of the pressing and limiting structures include lifting sleeves and fixed ears. The two lifting sleeves are slidably connected to the two lifting vertical tubes, and the two fixed ears are fixedly connected to the two lifting vertical tubes. A fixed rotating frame is rotatably connected to each of the two fixed ears. A connecting spring is fixedly connected to each of the two fixed rotating frames. A lifting rotating frame is fixedly connected to each of the two connecting springs. The two lifting rotating frames are rotatably connected to the two lifting sleeves. An arc-shaped limiting block is fixedly connected to each of the two lifting sleeves. The two arc-shaped limiting blocks are matched with the two side air pipes.

[0010] Preferably, a transmission gear is rotatably connected inside the support mounting frame, and the transmission gear meshes with a drive gear and a shaft gear. The drive gear is fixedly connected to the output shaft of the variable frequency motor, and the shaft gear is fixedly connected to the rotating shaft of the exhaust fan. The drive gear meshes with an internal gear ring, and the internal gear ring is fixedly connected to the annular fan.

[0011] Preferably, the blades in the exhaust fan are tilted in the opposite direction to the blades in the annular fan.

[0012] Preferably, the front air equalization pipe is provided with an external hexagonal drive section and a friction drive section.

[0013] A range hood includes a housing and a fan system installed inside the housing. Guide sleeves are fixedly connected to both ends of the housing. Two vertical lifting pipes are slidably engaged with the two guide sleeves. A support frame is fixedly connected inside the housing, and a support mounting bracket is fixedly connected to the support frame. Multiple air inlet pipes are provided on the outer side of the housing, each communicating with a different air intake pipe. Two external exhaust pipes are fixedly connected to the housing. The bottom ends of the two external exhaust pipes are connected to two external exhaust channels, and the top ends of the two external exhaust pipes are connected to two quick-connect pipes.

[0014] Preferably, both ends of the outer casing are rotatably connected to a transfer frame, and both transfer frames are rotatably connected to a limit hook, with the two limit hooks respectively matching the two side air pipes.

[0015] Preferably, the outer casing of the machine body is provided with a lateral through-hole for the external exhaust pipe to be installed.

[0016] Compared with the prior art, the present invention provides a fan system for a range hood and a range hood, which has the following beneficial effects: (1). In this invention, by setting up the fan assembly, a single fan is used to construct an internal and external bidirectional air path, which can provide suction power and pushing power for the exhaust of oil fumes simultaneously. The overall structure is simple and compact, and it can also reduce the heat loss in the oil fumes, making it more practical.

[0017] (2). In this invention, by optimizing the structure of the blowing pipe and coordinating the reasonable arrangement of the blowing outlet with the fan assembly, the air supply can play a good auxiliary guiding and wind direction adjustment role, and the product function is more complete.

[0018] (3). In this invention, the range hood can be matched and assembled with the range hood, and the air blowing pipe and range hood fan system can be combined to form an integrated installation structure, which facilitates flexible adjustment of the air blowing pipe and daily use. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural schematic diagram showing a partial cross-section of the present invention; Figure 2 For the present invention Figure 1 A magnified schematic diagram of the partial structure at point A in the middle; Figure 3 For the present invention Figure 1 A magnified schematic diagram of the local structure at point B; Figure 4 For the present invention Figure 1 A magnified schematic diagram of the structure at point C in the middle; Figure 5 This is a three-dimensional structural schematic diagram showing a partial cross-section of the supporting mounting frame, partition frame, and variable frequency motor of the present invention. Figure 6 This is a three-dimensional structural diagram of the entire invention; Figure 7 This is a three-dimensional structural diagram of the exhaust fan and shaft gear of the present invention. Figure 8 This is a three-dimensional structural diagram of the engagement of the annular fan and the internal gear ring of the present invention; Figure 9 This is a three-dimensional structural diagram of the entire invention; Figure 10 For the present invention Figure 9 A magnified schematic diagram of the local structure at point D; Figure 11 This is a three-dimensional structural diagram of the supporting mounting bracket, partition bracket, and extended contact ring of the present invention.

[0020] In the diagram: 1. Quick-connect pipe; 2. Support mounting bracket; 3. Divider bracket; 4. Exhaust fan; 5. Circular fan; 6. Variable frequency motor; 7. External exhaust pipe; 8. Gradient air collection hood; 9. Extended contact ring; 10. Inlet pipe; 11. External exhaust channel; 12. Lifting riser; 13. Fixed elbow; 14. Side equalization pipe; 15. Connecting elbow; 16. Front equalization pipe; 17. End rod; 18. Linkage rod; 19. Transmission frame; 20. Lifting sleeve; 21. Fixed ear; 22. Fixed rotating frame; 23. Connecting spring; 24. Lifting rotating frame; 25. Arc-shaped limiting block; 26. Transmission gear; 27. Drive gear; 28. Shaft gear; 29. ​​Internal gear ring; 30. External hexagonal drive section; 31. Friction drive section; 32. Housing shell; 33. Guide sleeve; 34. Support frame; 35. Air inlet pipe; 36. External guide pipe; 37. Adjustment frame; 38. Limiting hook; 39. Lateral pipe opening. Detailed Implementation

[0021] 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.

[0022] For examples, please refer to Figures 1-11 A range hood fan system includes a fan assembly and an air blowing pipe connected to two quick-connect pipes 1. The fan assembly includes a support mounting frame 2, a partition frame 3 fixedly connected to the support mounting frame 2, an exhaust fan 4 rotatably connected to the support mounting frame 2, and an annular fan 5 rotatably connected to the partition frame 3. A variable frequency motor 6 is mounted on the support mounting frame 2, and a transmission gear 26 rotatably connected inside the support mounting frame 2. The transmission gear 26 meshes with a drive gear 27 and a shaft gear 28. The drive gear 27 is fixedly connected to the output shaft of the variable frequency motor 6, and the shaft gear 28 is fixedly connected to the rotation shaft of the exhaust fan 4. The drive gear 27 meshes with an internal gear ring 29, which is fixedly connected to the annular fan 5. The frequency motor 6 is used for the synchronous drive of the exhaust fan 4 and the ring fan 5. The support mounting bracket 2 is fixedly connected to the extended contact ring 9. A rotation seal is set between the extended contact ring 9 and the ring fan 5. The top of the extended contact ring 9 is fixedly connected to the exhaust pipe 7. Multiple air inlet pipes 10 are connected to the extended contact ring 9. The exhaust pipe 7 is connected to the partition frame 3. The bottom of the partition frame 3 is fixedly connected to the gradient air collection hood 8. The partition frame 3 is connected to two exhaust channels 11. The two exhaust channels 11 are respectively connected to two quick-connect pipes 1. Through the setting of the fan assembly, a single fan is used to build a bidirectional air path inside and outside, which can provide suction power and pushing power for the exhaust of oil fumes. The overall structure is simple and compact, and it can also reduce the heat loss in oil fumes, making it more practical.

[0023] It should be further explained that the air blowing pipeline includes two lifting vertical pipes 12, which are respectively connected to two quick-connect pipes 1. Each lifting vertical pipe 12 is fixedly connected to a fixed elbow 13. Each of the two fixed elbows 13 is rotatably connected to a side air equalization pipe 14. Each of the two side air equalization pipes 14 is rotatably connected to a connecting elbow 15. A front air equalization pipe 16 is rotatably connected between the two connecting elbows 15. Both ends of the front air equalization pipe 16 are equipped with linkage structures. The two side air equalization pipes 14 are respectively matched with two linkage structures. Each of the two lifting vertical pipes 12 is equipped with a pressing and limiting structure, which is matched with the two side equalization air pipes 14 respectively. Each of the two linkage structures includes an end rod 17, which is fixedly connected to the left and right ends of the front equalization air pipe 16 respectively. Each of the two side equalization air pipes 14 is fixedly connected with a linkage rod 18, and a transmission frame 19 is rotatably connected to each of the two linkage rods 18. The two transmission frames 19 are rotatably connected to the two end rods 17 respectively. Each of the two pressing and limiting structures includes a lifting sleeve 20 and a fixing ear. 21. Two lifting sleeves 20 are slidably connected to two lifting vertical pipes 12 respectively. Two fixed ears 21 are fixedly connected to two lifting vertical pipes 12 respectively. Fixed rotating frames 22 are rotatably connected to both fixed ears 21. Connecting springs 23 are fixedly connected to both fixed rotating frames 22. Lifting rotating frames 24 are fixedly connected to both connecting springs 23 respectively. Lifting rotating frames 24 are rotatably connected to both lifting sleeves 20 respectively. Arc-surface limiting blocks 25 are fixedly connected to both lifting sleeves 20 respectively. Arc-surface limiting blocks 25 are matched with two side air equalization pipes 14 respectively. By optimizing the air blowing pipe structure and cooperating with the fan assembly to reasonably arrange the air blowing outlet, it can play a good auxiliary guiding and wind direction adjustment role for the air supply airflow. The product function is more complete. The fan blades in the smoke exhaust fan 4 and the fan blades in the ring fan 5 are tilted in opposite directions, so that the air driving directions of the smoke exhaust fan 4 and the ring fan 5 are opposite. The front air equalization pipe 16 is provided with an external hexagonal drive section 30 and a friction drive section 31 to facilitate the auxiliary drive of the front air equalization pipe 16.

[0024] A range hood includes a housing 32 and a fan system installed inside the housing 32. Guide sleeves 33 are fixedly connected to both ends of the housing 32. Two vertical lifting pipes 12 are slidably engaged with the two guide sleeves 33 respectively. A support frame 34 is fixedly connected inside the housing 32, and a support mounting bracket 2 is fixedly connected to the support frame 34. Multiple air inlet pipes 35 are provided on the outer side of the housing 32, and each air inlet pipe 35 is connected to a multiple air intake pipe 10. Two external guide pipes 36 are fixedly connected to the housing 32, and the bottom ends of the two external guide pipes 36 are respectively connected to... Two external exhaust channels 11 are connected, and the top ends of two external inlet pipes 36 are respectively connected to two quick-connect pipes 1. The left and right ends of the body shell 32 are rotatably connected to adjustment brackets 37. Both adjustment brackets 37 are rotatably connected to limit hooks 38. The two limit hooks 38 are respectively matched with two side air pipes 14. The body shell 32 is provided with a side pipe through port 39 for the external exhaust pipe 7 to be installed. With the matching of the range hood, it can be adapted and assembled with the range hood, and combined with the air blowing pipe and range hood fan system to form an integrated installation structure, which facilitates flexible adjustment of the air blowing pipe and daily use.

[0025] The variable frequency motor 6 in this embodiment is a conventional device known to those skilled in the art and purchased from the market. In this invention, it is simply used without any modification to its structure or function. Its setting method, installation method, and electrical connection method can be easily understood by those skilled in the art by following the instructions for use. Therefore, they will not be described in detail here.

[0026] In summary, the working principle of the range hood's fan system and the range hood itself is as follows: Before formal operation, the assembly of the entire unit relative to the gas stove must be completed. The outer casing 32 is fixedly installed above the gas stove. The support mounting bracket 2 of the fan assembly is fixedly connected to the support frame 34 inside the outer casing 32. The two lifting vertical pipes 12 are slidably fitted with the two guide sleeves 33 to limit the vertical movement trajectory of the lifting vertical pipes 12. Then, the external exhaust pipe 7 is installed through the side through-hole 39 to ensure the sealing of the pipe connection. Subsequently, multiple air inlet pipes 35 are connected to multiple air inlet pipes 10 respectively. At the same time, the top ends of the two external exhaust pipes 36 are respectively connected to the two quick-connect pipes 1 to realize the fan assembly. The piping is interconnected with the air blowing pipe to complete the assembly of the whole machine. During the operation of the equipment, the variable frequency motor 6 serves as the sole power source to achieve the operation. This variable frequency motor 6 is a common general-purpose electrical device on the market. The staff only needs to complete the electrical connection, installation and fixing and parameter debugging according to the corresponding instruction manual. There is no need to modify or optimize the structure and function of the motor itself. The rotation of the output shaft of the variable frequency motor 6 causes the drive gear 27 fixedly connected to it to rotate. The rotation of the drive gear 27 drives the transmission gear 26 meshing with it to rotate, and also drives the internal gear ring 29 meshing with it to rotate synchronously. The rotation of the transmission gear 26 then drives the exhaust fan 4 to form a fan inside the support mounting frame 2 through the shaft gear 28 meshing with it. In the rotating operation, since the internal gear ring 29 is fixedly connected to the annular fan 5 rotatably connected to the partition frame 3, and the blades in the exhaust fan 4 and the annular fan 5 are tilted in opposite directions, the annular fan 5 rotates synchronously while the exhaust fan 4 rotates. The air drive directions of the two are set in opposite directions, forming a bidirectional airflow under the synchronous drive of a single variable frequency motor 6, thus constructing a bidirectional air path operation mode. The exhaust fumes are assisted by the suction action of the exhaust fan 4. During the exhaust process, the fumes are collected by the gradient air collection hood 8 at the bottom of the partition frame 3 and discharged through the exhaust duct 7. Simultaneously, the annular fan 5 draws in gas through the air inlet pipe 35, which is located at the necked-off point outside the outer casing 32, ensuring... While ensuring gas extraction, it also avoids the mixing of flue gas with the gas. The gas entering through the air inlet pipe 35 is guided into the quick-connect pipe 1 by the auxiliary turbulence drive of the annular fan 5 through the two external exhaust channels 11 and the two external inlet pipes 36. The gas entering the quick-connect pipe 1 will be introduced into the two side equalization pipes 14 through the two lifting vertical pipes 12 respectively. The gas entering the two side equalization pipes 14 will then be collected into the front equalization pipe 16 through the connecting elbow 15. Since the front equalization pipe 16 and the two side equalization pipes 14 are equipped with multiple exhaust holes, the gas in the front equalization pipe 16 and the two side equalization pipes 14 will be discharged through the exhaust holes to form a flowing wind wall in the area above the stove, causing the flue gas on the stove to flow towards the flue gas inlet at the bottom of the outer casing 32.

[0027] In use, the front equalization gas pipe 16 and the two side equalization gas pipes 14 are all supported on the cooktop surface of the gas stove. The cooktop surface provides height support for both. In actual use, the orientation of the exhaust port can be adjusted according to the height distance between the outer casing 32 and the cooktop, so that the tilt of the air wall matches the flue gas inlet at the bottom of the outer casing 32. During adjustment, first push the lifting sleeve 20, which is slidably connected to the lifting vertical pipe 12, upward so that the connecting spring 23 enters the upward tilting limit state after extreme compression. At this time, under the action of the connecting spring 23, the lifting sleeve 20 will be in a raised and separated state relative to the corresponding side equalization gas pipe 14. The arc-shaped limiting block 25 fixedly connected to the sleeve 20 is separated from the side equalization air pipe 14. Then, the front equalization air pipe 16 can be auxiliaryly rotated via the external hexagonal drive section 30 and friction drive section 31 provided on it. The rotation of the front equalization air pipe 16 drives the end rods 17 fixedly connected to its left and right ends to rotate. The rotation of the end rods 17 drives the transmission frame 19 rotatably connected to them to move. The movement of the transmission frame 19 then drives the linkage rod 18 rotatably connected to it to rotate. The rotation of the linkage rod 18 drives the corresponding side equalization air pipe 14, thereby achieving synchronous multi-angle attitude adjustment of the side equalization air pipe 14 and the front equalization air pipe 16, thus changing the orientation of the air outlet. The direction of the airflow is adjusted to accommodate different installation heights between the cooktop and the outer casing 32. After adjustment, the lifting sleeve 20 is pressed down, causing the connecting spring 23 to return to its downward tilted limit state after extreme compression. At this time, under the action of the connecting spring 23, the lifting sleeve 20 is in contact with the corresponding side air pipe 14. The arc-shaped limiting block 25 contacts the side air pipe 14, forming a rotation limit on the side air pipe 14. In addition, by controlling the operating power of the variable frequency motor 6, the rotation speed of the exhaust fan 4 and the ring fan 5 can be adjusted synchronously, thereby adjusting the negative pressure of oil fume extraction, the airflow pushing pressure, and the air delivery of the blowing pipe. The wind intensity is suitable for different working conditions such as light and heavy oil fumes. The entire set of equipment relies on the fan assembly to achieve bidirectional air circulation throughout the operation. Combined with the flexibly adjustable air blowing pipeline, it completes the oil fume diversion and purification. After use, the variable frequency motor 6 is turned off, and the transmission structure and fan structure stop operating synchronously. The two limit hooks 38 set on the adjustment frame 37 rotatably connected to the left and right ends of the machine body shell 32 can achieve auxiliary limit of the side air pipes 14 through the hooking action of the limit hooks 38 when the two side air pipes 14 are raised. This makes it easy to maintain the rising posture of the side air pipes 14 and the front air pipe 16 relative to the stove surface, which facilitates the cleaning of the stove surface.

[0028] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A range hood fan system comprising a fan assembly, characterized by, Also include blowing pipeline, the blowing pipeline is linked to two quick -witted pipe (1) is installed, the fan assembly includes support mounting bracket (2), support mounting bracket (2) is fixedly connected with the partition frame (3), support mounting bracket (2) is rotatably connected with the smoke exhaust fan (4), the partition frame (3) is rotatably connected with annular fan (5), support mounting bracket (2) is installed with variable frequency motor (6), the variable frequency motor (6) is used for the synchronous drive of the smoke exhaust fan (4) and annular fan (5), support mounting bracket (2) is fixedly connected with the overhanging contact ring (9), the overhanging contact ring (9) is provided with rotary seal between annular fan (5), the top of overhanging contact ring (9) is fixedly connected with the outer exhaust air pipe (7), overhanging contact ring (9) is linked to install with multiple air inlet pipe (10), the outer exhaust air pipe (7) is communicated with the partition frame (3), the bottom of partition frame (3) is fixedly connected with the gradually changing gas collection cover (8), the partition frame (3) is linked to install with two outer exhaust channels (11), two the outer exhaust channels (11) are communicated with two quick -witted pipe (1) respectively.

2. A fan system for a range hood according to claim 1, wherein The blowing pipeline includes two lifting vertical pipes (12), two the lifting vertical pipes (12) are communicated with two quick -witted pipe (1) respectively, the lifting vertical pipe (12) is fixedly communicated with fixed elbow (13), two the fixed elbow (13) are rotatably communicated with side gas pipe (14), two the side gas pipe (14) are rotatably communicated with communication elbow (15), two the communication elbow (15) are rotatably communicated with front gas pipe (16), both ends of the front gas pipe (16) are installed with linkage structure, two the side gas pipe (14) are matched with two linkage structures respectively, two the lifting vertical pipes (12) are provided with press -fitting limit structure, two the press -fitting limit structure is matched with two side gas pipe (14) respectively.

3. A range hood fan system according to claim 2 wherein, Two the linkage structures all include end rod (17), two the end rod (17) are fixedly connected in the left and right ends of the front gas pipe (16), two the side gas pipe (14) are fixedly connected with linkage rod (18), two the linkage rod (18) are rotatably connected with transmission frame (19), two the transmission frame (19) are rotatably connected with two the end rod (17) respectively.

4. The fan system for a range hood according to claim 3, wherein Two the press -fitting limit structure all include lifting sleeve (20) and fixed lug (21), two the lifting sleeve (20) are slidably connected with two lifting vertical pipes (12), two the fixed lug (21) are fixedly connected with two lifting vertical pipes (12), two the fixed lug (21) are rotatably connected with fixed swing frame (22), two the fixed swing frame (22) are fixedly connected with connecting spring (23), two the connecting spring (23) are fixedly connected with lifting swing frame (24), two the lifting swing frame (24) are rotatably connected with two the lifting sleeve (20), two the lifting sleeve (20) are fixedly connected with arc surface limit block (25), two the arc surface limit block (25) are matched with two side gas pipe (14) respectively.

5. A range hood fan system according to claim 4 wherein, The support mounting bracket (2) is rotatably connected to a transmission gear (26), which meshes with a drive gear (27) and a shaft gear (28). The drive gear (27) is fixedly connected to the output shaft of the variable frequency motor (6), and the shaft gear (28) is fixedly connected to the rotating shaft of the exhaust fan (4). The drive gear (27) meshes with an inner gear ring (29), which is fixedly connected to the annular fan (5).

6. A range hood fan system according to claim 5 wherein, The blades of the exhaust fan (4) are tilted in the opposite direction to the blades of the annular fan (5).

7. A range hood fan system according to claim 6 wherein, The front air equalization pipe (16) is provided with an external hexagonal drive section (30) and a friction drive section (31).

8. A range hood comprising a body housing (32) and a range hood fan system mounted inside the body housing (32), characterized in that, The range hood fan system adopts the range hood fan system according to any one of claims 1-7. The left and right ends of the outer casing (32) are fixedly connected with guide sleeves (33). The two lifting vertical pipes (12) are respectively slidably engaged with the two guide sleeves (33). The inner casing (32) is fixedly connected with a support frame (34). The support mounting bracket (2) is fixedly connected to the support frame (34). The outer side of the outer casing (32) is provided with multiple air inlet pipes (35). The multiple air inlet pipes (35) are respectively connected to multiple air inlet pipes (10). The outer casing (32) is fixedly connected with two external pipes (36). The bottom ends of the two external pipes (36) are respectively connected to the two external exhaust channels (11). The top ends of the two external pipes (36) are respectively connected to the two quick-connect pipes (1).

9. The range hood according to claim 8, wherein The left and right ends of the fuselage shell (32) are rotatably connected to a transfer frame (37), and the two transfer frames (37) are rotatably connected to a limit hook (38). The two limit hooks (38) are respectively matched with the two side air pipes (14).

10. The range hood according to claim 9, wherein The outer casing (32) of the fuselage is provided with a lateral through-hole (39), which is for the external exhaust pipe (7) to be installed.

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