Range hood

Abstract

A kind of range hood, including main frame, outer shell and smoke collecting hood, the outer shell of the foregoing is located outside main frame, its characterized in that the drive mechanism and the lower mechanism are equipped on the main frame, the drive mechanism can drive outer shell to move up and down relative to main frame;The smoke collecting hood is equipped with guide pillar that penetrates the aforementioned air inlet plate, the top end of the guide pillar has the enlarged head portion that the air inlet plate is separated from and is equipped with compression spring, and the lower mechanism can drive the aforementioned air inlet plate to overcome the elastic force of compression spring and approach smoke collecting port.The smoke collecting hood can complete lifting according to the size of smoke, and reaches the ideal balanced state in smoke collecting effect and use feeling.The lower mechanism can selectively open or close the first air inlet plate or the second air inlet plate according to the actual use of stove.

Description

Technical Field

[0001] This invention relates to a range hood for kitchens. Background Technology

[0002] Currently, Chinese cooking produces a lot of oil fumes. In order to maintain a clean kitchen environment and human health, range hoods have become one of the essential devices in modern family kitchens. However, as the application rate of range hoods increases, people are paying more and more attention to the oil fume extraction effect of range hoods.

[0003] If the distance between the range hood's air inlet and the area where cooking fumes are generated is large, the intake path of the fumes is longer, increasing the intake time and making it easier for fumes to escape during cooking. Lowering the installation height of the range hood and bringing the inlet as close to the smoke source as possible, thus expanding the negative pressure downwards, improves the fume extraction effect, but it also results in a smaller cooking space. The cook's head may accidentally bump into the fume hood, and a lower installation height also affects visibility and the overall appearance of the kitchen. Therefore, how to better match the fumes with the kitchen cabinets to achieve a balance between effective fume extraction and ease of use has always been a research direction for those skilled in the art. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a range hood that lowers the smoke collection box while increasing the diameter of the smoke collection port, in view of the above-mentioned technical status quo.

[0005] The technical solution adopted by the present invention to solve the above-mentioned technical problems is as follows: a range hood, including a main frame, an outer shell, and a smoke collection hood. The aforementioned outer shell is located outside the main frame, and the aforementioned smoke collection hood is located at the lower end of the outer shell. The aforementioned smoke collection hood has a downward-facing smoke collection port. The main frame is characterized by having a driving mechanism and a pressing mechanism. The driving mechanism can drive the outer shell to move up and down relative to the main frame. The smoke collection port is provided with an air inlet plate, and the smoke collection hood is provided with a guide post penetrating the aforementioned air inlet plate. The top of the guide post has an enlarged head that restricts the air inlet plate from detaching and is fitted with a compression spring. The top of the compression spring abuts against the bottom surface of the air inlet plate. The pressing mechanism can drive the aforementioned air inlet plate to overcome the elastic force of the compression spring and approach the smoke collection port.

[0006] The smoke collection port includes a first smoke collection port and a second smoke collection port arranged at intervals. Correspondingly, the air inlet plate includes a first air inlet plate for opening and closing the first smoke collection port and a second air inlet plate for opening and closing the second smoke collection port.

[0007] The pressing mechanism includes

[0008] The down-pressing motor is mounted on the main frame;

[0009] The first rotating shaft is rotatably mounted on the main frame at one end;

[0010] The second rotating shaft is rotatably mounted on the main frame at one end and connected to the first rotating shaft through a clutch mechanism;

[0011] The transmission mechanism can transmit the power of the aforementioned downward-pressing motor to the first rotating shaft;

[0012] The first deflector is mounted on the aforementioned first rotating shaft and can act on the back of the first air intake plate; and

[0013] The second deflector is located on the aforementioned second rotating shaft and can act on the back of the second air inlet plate;

[0014] The main frame is provided with a limiting rod on its inner side to restrict the first lever from continuing to rotate;

[0015] As the outer shell moves downward, the aforementioned air inlet plate gradually rises relative to the smoke collection port, causing the opening range of the smoke collection port to gradually increase.

[0016] The aforementioned pressing mechanism and air inlet plate have at least the following three states:

[0017] In the first case, neither the first nor the second paddle shifter mentioned above applies to the air intake panel;

[0018] The second type involves the first paddle shifter acting on the first air intake plate, while the second paddle shifter does not act on the second air intake plate.

[0019] The third type involves the first paddle not acting on the first air intake plate, while the second paddle acts on the second air intake plate.

[0020] Furthermore, the drive mechanism is located on the back of the main frame, and the main frame has guide rail assemblies on both sides that guide and cooperate with the outer shell.

[0021] The guide posts are at least two and arranged around the smoke collection port, preferably four, and the tops of the guide posts are connected as one piece by a crossbar.

[0022] The main frame is equipped with a fan, and the air inlet of the fan is connected to the smoke collection port.

[0023] The lower end face of the fume hood is equipped with an oil fume sensor that can be linked with the drive mechanism.

[0024] The drive mechanism includes a lifting motor, a lead screw, and a nut. The lead screw is rotatably mounted on the main frame and connected to the power output end of the lifting motor. The nut is located on the inner wall of the outer casing and rotates with the lead screw. The lower end face of the fume hood is equipped with an oil fume sensor that can be linked with the lifting motor.

[0025] To improve sealing, a first flange is provided at the bottom of the air inlet plate, and correspondingly, the smoke collection port is turned inward to form a second flange that seals with the aforementioned first flange.

[0026] The transmission mechanism is a gear set, preferably one of the following two types:

[0027] In the first embodiment, the gear set includes a first gear, a second gear, and a third gear. The first gear is connected to the output shaft of the down-pressing motor, the second gear is connected to a second rotating shaft, and the third gear meshes with both the first and second gears. The limiting rod is rotatably mounted on the main frame and one end is connected to the third gear.

[0028] The second type includes a first gear and a second gear meshing with the first gear. The first gear is connected to the output shaft of the down-pressing motor, and the second gear is connected to a second rotating shaft.

[0029] To further improve the smoking effect and user experience, the lower end face of the smoke hood is provided with a first oil fume sensor and a second oil fume sensor near the first and second smoke collection ports, respectively. The aforementioned first and second oil fume sensors are linked with the downward pressure motor.

[0030] The first rotating shaft has an insertion portion at its end, and the second rotating shaft has an inner hole at its end that is inserted into the insertion portion; the insertion portion and the inner hole have a rotational clearance; the clutch mechanism may include...

[0031] A movable ring is mounted on the first rotating shaft, capable of lateral movement.

[0032] A spring seat is provided on the second rotating shaft; and

[0033] The torsion spring has one end located on the aforementioned movable ring and the other end located on the aforementioned spring seat.

[0034] The outer wall of the first rotating shaft has guide ribs along its length, and correspondingly, the inner wall of the moving ring has guide grooves that mate with the aforementioned guide ribs. A torsion spring can be used to engage and disengage the first and second rotating shafts.

[0035] Furthermore, the elastic force of the torsion spring is greater than that of the compression spring.

[0036] Compared with the prior art, the advantages of the present invention are as follows: When the amount of oil fume is large, as the smoke hood moves downward with the outer shell, the air inlet plate slowly rises relative to the smoke collection port. As the smoke collection port approaches the smoke source, its diameter increases, which can significantly improve the smoke collection effect. When the amount of oil fume is small, as the smoke hood moves upward with the outer shell, the air inlet plate slowly approaches the smoke collection port, and the smoke collection port diameter decreases. The overall visual appearance is better, improving the user experience. The hood can be raised and lowered according to the amount of smoke, achieving an ideal balance between smoke collection effect and user experience.

[0037] The downward pressure mechanism can selectively open or close the first or second air intake plate according to the actual use of the stove, which helps to improve the smoke extraction effect and user experience. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of the structure when the air inlet plate is closed in Example 1.

[0039] Figure 2 This is a three-dimensional sectional view of Example 1.

[0040] Figure 3 This is a three-dimensional sectional view from another perspective of Example 1.

[0041] Figure 4 This is an enlarged view of the drive mechanism in Example 1.

[0042] Figure 5 This is a schematic diagram of the combination of the smoke collection hood and the pressing mechanism.

[0043] Figure 6 for Figure 5 Enlarged view of the middle and lower pressure mechanism.

[0044] Figure 7 for Figure 6 Magnified exploded view of the clutch mechanism.

[0045] Figure 8 This is a schematic diagram of the structure when the air inlet plate is opened in the embodiment.

[0046] Figure 9 for Figure 8 A schematic diagram of the combination of the central smoke hood and the downward pressing mechanism.

[0047] Figure 10 This is a schematic diagram of the structure when the first air inlet plate is closed and the second air inlet plate is open in Example 1.

[0048] Figure 11 This is a schematic diagram of the structure when the first air inlet plate is open and the second air inlet plate is closed in Embodiment 1.

[0049] Figure 12 This is an enlarged schematic diagram of the pressing mechanism in Example 2.

[0050] Figure 13 This is an enlarged schematic diagram of the pressing mechanism in Example 3. Detailed Implementation

[0051] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0052] like Figure 1 , Figure 2 , Figure 3 and Figure 5 As shown, the range hood in this embodiment includes a main frame 1, an outer shell 2, a drive mechanism 6, a pressing mechanism 7, a limiting rod 99, a fan 11, and a smoke collection hood 3. The outer shell 2 is located outside the main frame 1, and the smoke collection hood 3 is located at the lower end of the outer shell 2.

[0053] The smoke hood 3 has a downward-facing smoke collection port. The main frame 1 is equipped with a drive mechanism 6 and a pressing mechanism 9. The drive mechanism 6 can drive the outer casing 2 to move up and down relative to the main frame 1. An air inlet plate is provided on the smoke collection port. The smoke hood 3 has a guide post 8 that penetrates the air inlet plate. The top of the guide post 8 has an enlarged head 81 that restricts the air inlet plate from detaching and is fitted with a compression spring 82. The top of the compression spring 82 abuts against the bottom surface of the air inlet plate. The pressing mechanism 9 can drive the air inlet plate to overcome the elastic force of the compression spring 82 and approach the smoke collection port. A fan 11 is installed inside the main frame 1, and the air inlet of the fan 11 is connected to the smoke collection port.

[0054] Four guide pillars 8 are arranged around the smoke collection port. The tops of the guide pillars 8 are connected as one piece by a crossbar 83. The bottom of the air inlet plate is provided with a first flange 44, and correspondingly, the smoke collection port is turned inward to form a second flange 35 that seals with the first flange 44.

[0055] Combination Figure 8 As shown, the smoke collection port in this embodiment includes a first smoke collection port 33a and a second smoke collection port 33b arranged at intervals. Correspondingly, the air inlet plate includes a first air inlet plate 4a for opening and closing the first smoke collection port 33a and a second air inlet plate 4b for opening and closing the second smoke collection port 33b.

[0056] Combination Figure 3 and Figure 4 As shown, the drive mechanism 6 is located on the back of the main frame 1, and guide rail assemblies 5 are provided on both sides of the main frame 1 to guide and cooperate with the outer shell 2. In this embodiment, the drive mechanism 6 includes a lifting motor 61, a lead screw 62, and a nut 63. The lead screw 62 is rotatably mounted on the main frame 1 and connected to the power output end of the lifting motor 61. The nut 63 is located on the inner wall of the outer shell 2 and is rotatably cooperated with the lead screw 62.

[0057] Combination Figure 5 , Figure 6 and Figure 7As shown, the pressing mechanism 9 in this embodiment includes a pressing motor 91, a first rotating shaft 95, a second rotating shaft 96, a transmission mechanism, a first paddle 97, and a second paddle 98. The pressing motor 91 is mounted on the main frame 1. One end of the first rotating shaft 95 is rotatably mounted on the main frame 1. One end of the second rotating shaft 96 is rotatably mounted on the main frame 1 and connected to the first rotating shaft 95 through a clutch mechanism 7.

[0058] The transmission mechanism transmits power from the down-pressing motor 91 to the first rotating shaft 95; in this embodiment, the transmission mechanism is a gear set. The gear set includes a first gear 92, a second gear 93, and a third gear 94. The first gear 92 is connected to the output shaft of the down-pressing motor 91, the second gear 93 is connected to the second rotating shaft 96, and the third gear 94 meshes with both the first gear 92 and the second gear 93. A limiting rod 99 is rotatably mounted on the main frame 1 and one end is connected to the third gear 94.

[0059] The limiting rod 99 is used to limit the first paddle 97 from continuing to rotate; the first paddle 97 is located on the first rotating shaft 95 and can act on the back of the first air inlet plate 4a; the second paddle 98 is located on the second rotating shaft 96 and can act on the back of the second air inlet plate 4b.

[0060] The lower end face of the smoke hood 3 is provided with a first oil fume sensor 31a and a second oil fume sensor 31b near the first smoke collection port 33a and the second smoke collection port 33b, respectively. The first oil fume sensor 31a and the second oil fume sensor 31b are all linked with the lifting motor 61 and the pressing motor 91.

[0061] With the outer casing 2 moving downwards, the air inlet plate gradually rises relative to the smoke collection port, causing the opening range of the smoke collection port to gradually increase; the pressing mechanism 9 and the air inlet plate have the following three states:

[0062] In the first case, neither the first deflector 97 nor the second deflector 98 acts on the air intake plate;

[0063] In the second case, the first deflector 97 acts on the first air inlet plate 4a, while the second deflector 98 does not act on the second air inlet plate 4b.

[0064] The third type involves the first deflector 97 not acting on the first air intake plate 4a, and the second deflector 98 acting on the second air intake plate 4b.

[0065] The first rotating shaft 95 has an insertion portion 951 at its end, and the second rotating shaft 96 has an inner hole 961 at its end that is inserted into the insertion portion 951. The insertion portion 951 and the inner hole 961 have a rotational clearance. The clutch mechanism 7 includes a moving ring 71, a spring seat 73, and a torsion spring 72. The moving ring 71 is movably disposed on the first rotating shaft 95. The spring seat 73 is disposed on the second rotating shaft 96. One end of the torsion spring 72 is disposed on the moving ring 71, and the other end is disposed on the spring seat 73. In this embodiment, the elastic force of the torsion spring (72) is greater than the elastic force of the four compression springs (82). The outer wall of the first rotating shaft 95 has a guide rib 952 along its length direction. Correspondingly, the inner wall of the moving ring 71 has a guide groove that cooperates with the guide rib 952.

[0066] like Figure 1 ,and Figure 5 As shown, when the range hood is not working, it can be hidden behind the kitchen cabinet or only the front of the smoke collection hood can be displayed. In this state, the angle between the first and second levers is 0°, and the torsion spring is compressed under torsion (the initial angle between the first and second levers is 60°), pressing the air inlet plate against the air inlet of the smoke collection hood. The compression spring on the guide post is in a compressed state to prevent fumes from entering from the common flue.

[0067] like Figure 8 and Figure 9 As shown, when the user turns on the range hood, the range hood sends a command to the drive mechanism. Under the action of the drive mechanism, the outer casing and the smoke collection hood of the range hood descend. This causes the air intake plate to move upward relative to the smoke collection hood under the elastic force of the compression spring. This slowly opens the first and second smoke collection ports of the smoke collection hood until both air intake plates are fully open. At the same time, the range hood sends a command to the downward motor. The downward motor rotates clockwise and drives the second deflector to rotate. At this time, the torque of the torsion spring increases with the rotation. As the rotation gradually releases, the second rotating shaft remains stationary (because at this time, the apex of the second lever is still against the first air inlet plate; as the second lever rotates, the angle between the first and second levers slowly changes from 0° to 60° (after 60°, the torque of the torsion spring is fully released). Since stoves are generally dual-burner type, each burner is directly opposite each smoke collection chamber of the smoke collection hood. Thus, when the smoke collection hood descends, the distance between each air inlet and the burner is closer, which significantly improves the smoke extraction effect of the range hood and solves some of the user's concerns about smoke extraction efficiency.

[0068] like Figure 10As shown, if the user wants to improve the fume extraction effect above the right stove, when the range hood receives the command, the downward motor drives the first deflector counterclockwise to contact the first air intake plate. Because the torsion spring is designed to have a greater torque than the compression spring, when the first deflector contacts the first air intake plate, the downward motor continues to rotate, causing the first deflector to rotate (the torsion spring is slightly compressed, almost unchanged). The second deflector also rotates with the second shaft, but is farther away from the second air intake plate. The rotation of the first deflector causes the first air intake plate to slide down along the guide post (the compression spring is compressed) until the first air intake plate closes and the downward motor stops rotating. In this way, the first air intake plate closes and the second air intake plate opens to allow air in. According to the principle of fluid continuity, Q = V * S, where Q is the air volume, V is the flow velocity, and S is the cross-sectional area. Let the total airflow through the first and second smoke inlets be Qtotal. This airflow is determined by the fan performance. The sum of the airflow entering from the left cavity (Qleft) and the airflow entering from the right cavity (Qright) is equal to the total airflow, i.e., Qtotal = Qleft + Qright. When the left air inlet plate moves downwards, the left-side air inlet area decreases, i.e., Stotal decreases and Vtotal increases, while Sright remains unchanged, i.e., Qright increases. Since Qtotal = Qleft + Qright, with Qtotal remaining constant, Qleft decreases. In other words, when the left air inlet plate moves downwards, the airflow on the right side increases, and the airflow on the left side decreases, thus distributing the left-side airflow to the right side. If cooking is only done on one side, the other side can be completely shut off.

[0069] like Figure 11 As shown, if the user wants to improve the fume extraction effect above the left stove, when the range hood receives the command, the down-pressing motor drives the first and second rotating shafts to rotate counterclockwise. When the first deflector rotates to the position of the limit rod, it is blocked by the limit rod. If the down-pressing motor continues to rotate, it will drive the torsion spring to rotate. In this way, the second deflector continues to rotate, driving the second air intake plate to move downward. Because the first deflector has passed the lowest point, the first air intake plate slowly opens under the elastic force of the compression spring. When the first deflector rotates to the lowest point, the down-pressing motor stops rotating. In this way, the first air intake plate is completely closed and the second air intake plate is completely open, realizing the complete distribution of air volume from the right side to the left side.

[0070] With the addition of a fume sensor, when the sensor detects that the amount of fume is greater than the set value N, the fume collection hood of the range hood can automatically descend, simultaneously opening the air intake plate. Then, when the first fume sensor detects that the amount of fume above the left stove is greater than the set value N1, the flow rate of the right cavity on the right side can be distributed to the left cavity on the left side through the drive mechanism and the pressing mechanism. When the second fume sensor detects that the amount of fume above the right stove is greater than the set value N1, the flow rate of the left cavity on the left side can be distributed to the right cavity through the drive mechanism and the pressing mechanism.

[0071] Example 2, as Figure 12 As shown, in this embodiment, the limiting rod 99 is set separately and is not connected to the third gear. Other structures are as described in Embodiment 1.

[0072] Example 3, as Figure 13 As shown, in this embodiment, the gear set includes a first gear 92 and a second gear 93 meshing with the first gear 92. The first gear 92 is connected to the output shaft of the lowering motor 91, and the second gear 93 is connected to the second rotating shaft 96. Other structures are described in Embodiment 1.

Claims

1. A range hood, comprising a main frame (1), an outer casing (2), and a smoke collection hood (3), wherein the outer casing (2) is disposed outside the main frame (1), and the smoke collection hood (3) is disposed at the lower end of the outer casing (2), and the smoke collection hood (3) has a downward-facing smoke collection port, characterized in that... The main frame (1) is provided with a drive mechanism (6) and a pressing mechanism (9). The drive mechanism (6) can drive the outer shell (2) to move up and down relative to the main frame (1). The smoke collection port is provided with an air inlet plate. The smoke collection hood (3) is provided with a guide post (8) that penetrates the aforementioned air inlet plate. The top of the guide post (8) has an enlarged head (81) that restricts the air inlet plate from detaching and is fitted with a compression spring (82). The top of the compression spring (82) abuts against the bottom surface of the air inlet plate. The pressing mechanism (9) can drive the aforementioned air inlet plate to overcome the elastic force of the compression spring (82) and approach the smoke collection port. The smoke collection port includes a first smoke collection port (33a) and a second smoke collection port (33b) arranged at intervals. Correspondingly, the air inlet plate includes a first air inlet plate (4a) for opening and closing the first smoke collection port (33a) and a second air inlet plate (4b) for opening and closing the second smoke collection port (33b). The aforementioned pressing mechanism (9) includes The down-pressing motor (91) is mounted on the main frame (1); The first rotating shaft (95) is rotatably mounted on the main frame (1) at one end; The second rotating shaft (96) is rotatably mounted on the main frame (1) and connected to the first rotating shaft (95) via a clutch mechanism (7); The transmission mechanism can transmit the power of the aforementioned pressure motor (91) to the first rotating shaft (95); The first deflector (97) is disposed on the aforementioned first rotating shaft (95) and can act on the back of the first air inlet plate (4a); and The second paddle (98) is located on the aforementioned second rotating shaft (96) and can act on the back of the second air inlet plate (4b); The main frame (1) is provided with a limiting rod (99) on the inner side to limit the continued rotation of the first lever (97); As the outer shell (2) moves downward, the aforementioned air inlet plate gradually rises relative to the smoke collection port, causing the opening range of the smoke collection port to gradually increase. The aforementioned pressing mechanism (9) and air inlet plate have at least the following three states: In the first case, neither the first deflector (97) nor the second deflector (98) mentioned above act on the air intake plate; In the second case, the aforementioned first deflector (97) acts on the first air intake plate (4a), while the aforementioned second deflector (98) does not act on the second air intake plate (4b). The third type is where the first deflector (97) does not act on the first air intake plate (4a), and the second deflector (98) acts on the second air intake plate (4b).

2. The range hood according to claim 1, characterized in that... The drive mechanism (6) is located on the back of the main frame (1), and the main frame (1) has guide rail assemblies (5) on both sides that guide and cooperate with the outer shell (2).

3. The range hood according to claim 1, characterized in that... The drive mechanism (6) includes a lifting motor (61), a lead screw (62) and a nut (63). The lead screw (62) is rotatably mounted on the main frame (1) and connected to the power output end of the lifting motor (61). The nut (63) is located on the inner wall of the outer shell (2) and rotates in cooperation with the lead screw (62).

4. The range hood according to claim 1, characterized in that... The guide pillars (8) are at least two and arranged around the smoke collection port.

5. The range hood according to claim 4, characterized in that... The top of the guide post (8) is connected as one piece by a crossbar (83).

6. The range hood according to claim 4, characterized in that... The guide pillars (8) are four in number and arranged around the smoke collection port.

7. The range hood according to claim 1, characterized in that... The main frame (1) is equipped with a fan (11), and the air inlet of the fan (11) is connected to the smoke collection port.

8. The range hood according to claim 1, characterized in that... The lower end face of the smoke collection hood (3) is provided with an oil fume sensor that can be linked with the drive mechanism (6).

9. The range hood according to claim 8, characterized in that... The drive mechanism (6) includes a lifting motor (61), a lead screw (62) and a nut (63). The lead screw (62) is rotatably mounted on the main frame (1) and connected to the power output end of the lifting motor (61). The nut (63) is located on the inner wall of the outer shell (2) and rotates with the lead screw (62). The lower end face of the fume hood (3) is provided with an oil fume sensor that can be linked with the lifting motor (61).

10. The range hood according to claim 1, characterized in that... The bottom of the air inlet plate is provided with a first flange (44), and correspondingly, the smoke collection port is turned inward to form a second flange (35) that seals with the aforementioned first flange (44).

11. The range hood according to claim 1, characterized in that... The transmission mechanism is a gear set.

12. The range hood according to claim 11, characterized in that... The gear set includes a first gear (92), a second gear (93) and a third gear (94). The first gear (92) is connected to the output shaft of the down-press motor (91), the second gear (93) is connected to the second rotating shaft (96), and the third gear (94) meshes with the first gear (92) and the second gear (93) respectively.

13. The range hood according to claim 12, characterized in that... The limiting rod (99) is rotatably mounted on the main frame (1) and one end is connected to the third gear (94).

14. The range hood according to claim 11, characterized in that... The gear set includes a first gear (92) and a second gear (93) meshing with the first gear (92). The first gear (92) is connected to the output shaft of the down-press motor (91), and the second gear (93) is connected to the second rotating shaft (96).

15. The range hood according to claim 1, characterized in that... The lower end face of the smoke hood (3) near the first smoke collection port (33a) and the second smoke collection port (33b) is provided with a first oil fume sensor (31a) and a second oil fume sensor (31b), respectively. The aforementioned first oil fume sensor (31a) and second oil fume sensor (31b) are linked with the down-pressing motor (91).

16. The range hood according to claim 1, characterized in that... The first rotating shaft (95) has an insertion portion (951) at its end, and the second rotating shaft (96) has an inner hole (961) at its end that is inserted into the insertion portion (951). The insertion portion (951) and the inner hole (961) have a rotational clearance. The clutch mechanism (7) includes... The movable ring (71) is movably mounted on the first rotating shaft (95); A spring seat (73) is provided on the second rotating shaft (96); and A torsion spring (72) has one end on the aforementioned movable ring (71) and the other end on the aforementioned spring seat (73).

17. The range hood according to claim 16, characterized in that... The outer wall of the first rotating shaft (95) has a guide rib (952) along the length direction, and correspondingly, the inner wall of the moving ring (71) has a guide groove that cooperates with the aforementioned guide rib (952).

18. The range hood according to claim 16, characterized in that... The elastic force of the torsion spring (72) is greater than that of the compression spring (82).

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