Wind wheel anti-loosening mechanism and range hood

Abstract

The present invention discloses a wind wheel assembly anti-loosening mechanism and a range hood. The wind wheel assembly anti-loosening mechanism includes: a wind wheel assembly having a center hole; a drive assembly arranged outside the wind wheel assembly and having a drive shaft, the drive shaft being passed through the center hole and extending into the wind wheel assembly; a locking member arranged in the wind wheel assembly and fastened to the movable end of the drive shaft; a tongue assembly arranged between the wind wheel assembly and the locking member, for locking the locking member to the wind wheel assembly, or arranged between the wind wheel assembly and the drive shaft, for locking the drive shaft to the wind wheel assembly. The wind wheel assembly anti-loosening mechanism of the present invention can solve the problem of wind wheel assembly loosening.

Description

Technical Field

[0001] The present invention relates to the technical field of range hoods, and in particular to an anti-loosening mechanism for a wind wheel assembly and a range hood. Background Art

[0002] The fan wheel assembly of the existing household range hood is locked with a locking nut. During use, due to vibrations caused by the running of the motor and other reasons, the locking nut may become loose, causing the fan wheel assembly to loosen, thereby causing the range hood to malfunction. Summary of the Invention

[0003] The present invention aims to solve at least one of the problems existing in the existing related technologies to a certain extent. To this end, the present invention proposes a wind wheel assembly anti-loosening mechanism, which can solve the problem of wind wheel assembly loosening.

[0004] The present invention also provides a range hood having the wind wheel assembly anti-loosening mechanism.

[0005] According to the above-mentioned wind wheel assembly anti-loosening mechanism, it is achieved through the following technical solutions:

[0006] The anti-loosening mechanism of the wind wheel assembly includes: a wind wheel assembly having a center hole; a driving assembly, which is arranged outside the wind wheel assembly and has a driving shaft, and the driving shaft is passed through the center hole and extends into the wind wheel assembly; a locking member, which is arranged in the wind wheel assembly and is fastened to the movable end of the driving shaft; a tongue assembly, which is arranged between the wind wheel assembly and the locking member, and is used to lock the locking member to the wind wheel assembly, or is arranged between the wind wheel assembly and the driving shaft, and is used to lock the driving shaft to the wind wheel assembly.

[0007] In some embodiments, the wind wheel assembly has an installation cavity that opens toward the locking member or the drive shaft; the locking member or the drive shaft is provided with a plurality of grooves facing the installation cavity and arranged circumferentially at intervals; the tongue assembly is disposed in the installation cavity, and has a positioning portion facing the groove, and the positioning portion is engaged with one of the grooves.

[0008] In some embodiments, the positioning portion is a wedge-shaped positioning block with one end close to the groove being small and the other end being large; and the groove is an oblique groove that cooperates with the wedge-shaped positioning block.

[0009] In some embodiments, the tongue assembly includes: a fixing seat, which is arranged in the installation cavity and has a receiving groove connected to the installation cavity, and the receiving groove has a first groove wall and a second groove wall arranged opposite to each other; an elastic member, which is arranged in the receiving groove and abuts or connects to the second groove wall; a tongue, which is arranged in the receiving groove and clamped between the elastic member and the first groove wall, and the positioning portion is provided at one end of the tongue close to the cutting groove, and the top of the positioning portion is higher than the top of the installation cavity.

[0010] In some embodiments, the first groove wall is arranged to be inclined in the vertical direction, the second groove wall is arranged to be horizontally arranged or inclined in the vertical direction, and the angle between the second groove wall and the first groove wall is an acute angle; the tongue has an upper inclined surface adapted to the first groove wall.

[0011] In some embodiments, the elastic member includes a first elastic surface and a second elastic surface connected in a "V" shape, the second elastic surface is connected to or abuts the second groove wall, and the first elastic surface is connected to or abuts the tongue, for pressing the tongue tightly against the first groove wall.

[0012] In some embodiments, a connecting portion is provided at one end of the latch away from the positioning portion, and a countersunk hole connected to the receiving groove is provided at a position of the fixing seat corresponding to the connecting portion, and the connecting portion is rotatably inserted into the countersunk hole.

[0013] In some embodiments, the installation cavity includes a first cavity and a second cavity that are connected to each other. The fixing seat is installed in the first cavity, and the opening of the accommodating groove faces the second cavity. The positioning portion can rotate between being pressed into the second cavity and extending out of the second cavity.

[0014] In some embodiments, a limiting groove opening toward the driving assembly is provided at the bottom of the center disk of the wind wheel assembly, and a transmission pin cooperating with the limiting groove is provided on the driving shaft, and the transmission pin is engaged with the limiting groove.

[0015] According to the range hood provided above, it is implemented through the following technical solutions:

[0016] A range hood comprises the wind wheel assembly anti-loosening mechanism as described above.

[0017] Compared with the prior art, the present invention has at least the following beneficial effects:

[0018] The present invention fastens the locking piece to the drive shaft and uses a tongue assembly to lock the locking piece to the wind wheel assembly, so that a self-locking structure is formed between the locking piece and the wind wheel assembly, thereby reliably ensuring that the locking piece cannot rotate relative to the wind wheel assembly, thereby preventing the locking piece from loosening, and further ensuring that the wind wheel assembly is not loose, thereby effectively solving the problem of loosening of the wind wheel assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is an exploded view of the anti-loosening mechanism of the wind wheel assembly in Example 1 of the present invention;

[0020] Figure 2 1 is a top view of the anti-loosening mechanism of the wind wheel assembly in Example 1 of the present invention;

[0021] Figure 3 yes Figure 2 Cross-sectional view in the middle BB direction;

[0022] Figure 4 yes Figure 3 A partial enlarged view of part A;

[0023] Figure 5 is a schematic structural diagram of the locking member in Example 1 of the present invention;

[0024] Figure 6 This is a schematic structural diagram of the locking member in Example 1 of the present invention from another angle;

[0025] Figure 7 is an exploded view of the tongue assembly in Example 1 of the present invention;

[0026] Figure 8 It is a structural schematic diagram of the tongue assembly in Example 1 of the present invention.

[0027] In the figure: 1- wind wheel assembly, 101- center disk, 102- blades, 11- center hole, 12- wind wheel assembly shaft, 13- mounting cavity, 131- first cavity, 132- second cavity, 14- limiting groove;

[0028] 2-drive assembly, 21-drive shaft, 211-thread cutting, 212-transmission pin, 22-motor;

[0029] 3-locking member, 301-self-locking block, 302-protrusion, 31-slot, 311-first inclined slot wall, 312-second inclined slot wall, 32-threaded hole;

[0030] 4- tongue assembly, 41- fixing seat, 411- accommodating groove, 411a- first groove wall, 411b- first groove wall, 412- countersunk hole, 42- elastic member, 421- first elastic surface, 422- second elastic surface, 43- tongue, 431- positioning portion, 432- connecting portion. DETAILED DESCRIPTION

[0031] The following examples illustrate the present invention, but the present invention is not limited to these examples. Modifications to the specific embodiments of the present invention or equivalent replacements of some technical features without departing from the spirit of the present invention should be included in the scope of the technical solution claimed in the present invention.

[0032] Example 1

[0033] refer to Figure 1-4 This embodiment provides a rotor assembly anti-loosening mechanism, comprising a rotor assembly 1, a drive assembly 2, a locking member 3, and a tongue assembly 4. The rotor assembly 1 comprises a center disk 101 and a plurality of blades 102. A center hole 11 is provided at the center of the center disk 101. All blades 102 are circumferentially spaced apart and radially outwardly of the center disk 101, with gaps formed between adjacent blades 102 for airflow to pass through.

[0034] Drive assembly 2 includes a drive shaft 21 and a motor 22, with motor 22 mounted below center disk 101. Drive shaft 21 passes through center hole 11, with its connecting end (i.e., the lower end of drive shaft 21) connected to the output end of motor 22. The movable end (i.e., the upper end of drive shaft 21) extends above the upper end surface of center hole 11 to protrude into rotor assembly 1. Locking member 3 is preferably a locking nut, which is disposed within rotor assembly 1 and securely connected to the movable end of drive shaft 21. Thus, the locking nut, in mating connection with drive shaft 21, locks rotor assembly 1 to drive shaft 21.

[0035] The tongue assembly 4 is disposed between the wind wheel assembly 1 and the locking member 3 , and is used to lock the locking member 3 on the wind wheel assembly 1 , so as to form a self-locking structure between the locking member 3 and the wind wheel assembly 1 .

[0036] The impeller assembly of an existing range hood is locked to the drive shaft 2 using a locking nut. During use, due to factors such as vibration generated by the operation of the motor 22, the locking nut may rotate relative to the impeller assembly 1 due to the lack of a self-locking structure, thereby failing to reliably lock the impeller assembly 1. This causes the impeller assembly 1 to loosen, and further, the motor 22 cannot reliably drive the impeller assembly 1 to rotate, causing the range hood to malfunction. The present invention securely connects the locking member 3 to the drive shaft 2 and uses a tongue assembly 4 to lock the locking member 3 to the impeller assembly 1, thereby forming a self-locking structure between the locking member 3 and the impeller assembly 1. This reliably ensures that the locking member 3 cannot rotate relative to the impeller assembly 1, thereby preventing the locking member 3 from loosening and further ensuring that the impeller assembly 1 does not loosen, effectively solving the problem of the impeller assembly 1 loosening.

[0037] refer to Figure 1The center disk 101 is provided with a rotor assembly shaft 12 extending toward the locking member 3 around the periphery of the central hole 11. The rotor assembly shaft 12 is provided with three mounting cavities 13 opening toward the locking member 3. The three mounting cavities 13 are evenly spaced along the circumference of the rotor assembly shaft 12. A latch assembly 4 is mounted in each mounting cavity 13. Each latch assembly 4 engages with a corresponding locking member 3 to form multiple connection points, improving the stability and reliability of the self-locking mechanism. This embodiment, by providing the rotor assembly shaft 12 and locating the mounting cavities 13 on the rotor assembly shaft 12, not only strengthens the center disk 101 but also ensures that the rotor assembly 1 has sufficient space to mount the latch assembly 4.

[0038] In this embodiment, each mounting cavity 13 includes a first cavity 131 and a second cavity 132 that are connected to each other. The horizontal cross-sectional area of ​​the first cavity 131 is larger than the horizontal cross-sectional area of ​​the second cavity 132, and the first cavity 131 is suitable for assembling the fixing seat 41 in the tongue assembly 4, and the second cavity 132 is suitable for accommodating the tongue 43 in the tongue assembly 4 so that the tongue 43 can be pressed into the second cavity 132 during the rotation of the locking member 3.

[0039] refer to Figure 1-4 The bottom of the center plate 101 is provided with two downward-opening retaining grooves 14, spaced apart and located around the lower end surface of the center hole 11. Correspondingly, the drive shaft 21 is provided with two drive pins 212, positioned between the motor 22 and the center plate 101. Each drive pin 212 engages with a corresponding retaining groove 14. Thus, the rotor assembly 1 is secured downward by the engagement of the drive pins 212 with the retaining grooves 14.

[0040] A threaded section 211 is formed at the movable end of the drive shaft 21. This threaded section 211 is used to rotate and lock with the locking member 3 (i.e., the locking nut) to form an upper limit position for the wind rotor assembly 1. With the upper and lower limit positions coordinated, the drive shaft 21 is securely connected to the wind rotor assembly 1, thereby ensuring that the drive shaft 21 can reliably drive the wind rotor assembly 1 to rotate.

[0041] refer to Figure 5-6 The locking member 3 includes a self-locking block 301 and a protrusion 302. The protrusion 302 is fixed at the top center of the self-locking block 301 and extends upward. The locking member 3 has a threaded hole 32 that mates with the threaded segment 211. The threaded hole 32 is provided on the protrusion 302 and extends downward to penetrate the center of the self-locking block 301, with the threaded hole 32 opening toward the drive shaft 21. During installation, the threaded hole 32 and the threaded segment 211 rotate together to lock the locking member.

[0042] A plurality of slots 31 are provided at the bottom of the self-locking block 301 and are evenly spaced in the circumferential direction. The latch 43 in each latch assembly 4 is provided with a positioning portion 431 facing the slot 31, and the positioning portion 431 can be engaged with one of the slots 31 (refer to FIG. Figure 4 ) to form a self-locking.

[0043] In this embodiment, the slot 31 is an oblique slot having a first oblique slot wall 311 and a second oblique slot wall 312 connected at an acute angle. The first oblique slot wall 311 is perpendicular to the bottom surface of the locking member 3, which is designed to be a horizontal surface. This allows the first oblique slot wall 311 to reliably retain the positioning portion 431, preventing it from falling out of the slot and thus ensuring that the locking member 3 cannot rotate or loosen. The second oblique slot wall 312 is arranged at an angle in the vertical direction to serve as a guide, facilitating the smooth insertion of the positioning portion 431 into one of the oblique slots.

[0044] refer to Figure 7-8 The positioning portion 431 is a wedge-shaped positioning block with a small end near the groove 31 and a large end at the other end, so that the tip of the wedge-shaped positioning block is stuck in the inclined groove of the locking member 3 and tightly pressed against the first inclined groove wall 311 of the inclined groove (refer to Figure 4 ), forming a self-locking function to prevent the locking member 3 from rotating loose when the range hood is working.

[0045] The tongue assembly 4 includes a fixing seat 41, an elastic member 42, and a tongue 43. The fixing seat 41 is disposed in the first cavity 131 of the mounting cavity 13 and has a receiving slot 411 that opens toward the first cavity 132 and connects the first and second cavities. In this embodiment, the receiving slot 411 extends through the top left front side of the fixing seat 41, part of the left side wall of the fixing seat 41, and part of the front side wall of the fixing seat 41, so that the receiving slot 411 has three openings: upward, left, and forward. The front opening facilitates the assembly of the elastic member 42 and the tongue 43 from the front side wall of the fixing seat 41 into the receiving slot 411. The left opening is an opening toward the second cavity 132. The upward and left openings facilitate the rotation of the tongue 43 to extend out of or at least partially retract into the second cavity 132 of the mounting cavity 13.

[0046] The receiving groove 411 has a first groove wall 411a and a second groove wall 411b arranged opposite each other. The first groove wall 411a is arranged vertically and tilted, while the second groove wall 411b is arranged horizontally or vertically and tilted. The angle between the second groove wall 411b and the first groove wall 411a is acute. In this embodiment, the first groove wall 411a is designed to be arranged from bottom to top and tilted to the left, while the second groove wall 411b is arranged horizontally.

[0047] The latch tongue 43 is rotatably disposed within the receiving slot 411 and abuts the first slot wall 411a. The elastic member 42 is disposed within the receiving slot 411 and located between the second slot wall 411b and the latch tongue 43, and is used to push the latch tongue 43 against the first slot wall 411a, thereby stably and reliably clamping the latch tongue 43 between the elastic member 42 and the first slot wall 411a.

[0048] The latch 43 has an upper slope that aligns with the first slot wall 411a. A positioning portion 431 is provided at one end of the latch 43, near the slot 31. The top of the positioning portion 431 is higher than both the top of the receiving slot 411 and the top of the mounting cavity 13. The positioning portion 431 can extend or at least partially retract into the second cavity 132 of the mounting cavity 13 as the latch 43 rotates.

[0049] The end of the latch 43 away from the positioning portion 431 is provided with a connecting portion 432, which is preferably cylindrical. A countersunk hole 412 connected to the receiving groove 411 is provided at the position of the fixing seat 41 corresponding to the connecting portion 432, and the countersunk hole 412 is cylindrical and matches the connecting portion 432. During installation, the latch 43 can be movably arranged in the receiving groove 411, and the connecting portion 432 of the latch 43 can be rotatably inserted in the countersunk hole 412 so that the latch 43 can rotate with the connecting portion 432 as the rotating axis. Specifically, the diameter of the countersunk hole 412 is larger than the width of the connection between the receiving groove 411 and the countersunk hole 412 to prevent the connecting portion 432 from falling out of the countersunk hole 412 toward the receiving groove 411, thereby ensuring the installation reliability of the latch 43.

[0050] In this embodiment, the elastic member 42 includes a first elastic surface 421 and a second elastic surface 422 connected in a V-shape. The connection between the first elastic surface 421 and the second elastic surface 422 is formed in an arc transition to enhance the elastic force of the elastic member 42. The second elastic surface 422 is connected to or abuts the second groove wall 411b, while the first elastic surface 421 is connected to or abuts the lower inclined surface of the latch 43, thereby pressing the latch 43 against the first groove wall 411a.

[0051] In the initial state, under the pre-pressure of the elastic member 42, the latch tongue 43 is pressed against the first groove wall 411a. Figure 8 During the screwing and locking process of the locking member 3, the locking member 3 presses the positioning portion 431 of the latch 43, causing the second elastic surface 422 of the elastic member 42 to be compressed downwardly to the left. The latch 43 and the positioning portion 431 are pressed downwardly to the left into the second cavity 132 of the mounting cavity 13, thereby ensuring that the locking member 3 can be smoothly rotated and locked to the drive shaft 21.

[0052] The following combination Figure 1-4 To illustrate the installation principle of the anti-loosening mechanism of the wind wheel assembly of this embodiment:

[0053] During installation, the drive shaft 21 is passed through the central hole 11 of the wind wheel assembly 1, and the transmission pin 212 on the drive shaft 21 is installed into the limiting groove 14 on the middle plate 101 (refer to Figure 3 The threaded section 211 at the movable end of the drive shaft 21 is designed to be left-handed. The locking member 3 is screwed counterclockwise onto the drive shaft 21 and tightened using a wrench or other tool. It should be noted that the inclination angle of the second chute wall 312 in the slot 31 is designed within a certain range based on experimental results to ensure that the second chute wall 312 does not form an acute angle with the rotation of the locking member 3.

[0054] During the screwing and locking process, the locking member 3 presses the positioning portion 431 of the latch tongue 43, and the elastic member 42 in the latch tongue assembly is compressed to the lower left (refer to Figure 3 ), the latch tongue 43 is pressed downward to the left into the mounting cavity 13 of the mounting latch tongue assembly 4 so that the locking member 3 can be smoothly rotated and locked.

[0055] When the locking member 3 is locked to the drive shaft 21, the rebound force of the elastic member 42 causes the angled tip of the positioning portion 431 to engage the inclined groove of the locking member 3 and press against the first inclined groove wall 311 of the locking member 3, thereby forming a self-locking structure. When the range hood is in operation, the locked locking member 3 cannot be rotated clockwise to loosen, thereby preventing the impeller assembly 1 from loosening and effectively preventing the impeller assembly 1 from loosening.

[0056] This embodiment also provides a range hood including the aforementioned impeller assembly anti-loosening mechanism. The impeller assembly anti-loosening mechanism utilizes the right-hand self-locking structure formed between the oblique tip of the latch 43 and the locking member 3 to reliably secure the locking member 3 and impeller assembly 1 from loosening, effectively resolving the problem of malfunction in the range hood.

[0057] Example 2

[0058] This embodiment differs from the first embodiment in that the tongue assembly 4 has a different installation direction and engaging components. If there is sufficient assembly space, the tongue assembly 4 is positioned between the rotor assembly 1 and the drive shaft 21 to lock the drive shaft 21 to the rotor assembly 1. This creates a self-locking structure between the drive shaft 21 and the rotor assembly 1.

[0059] Specifically, the opening of the mounting cavity 13 is designed to face the drive shaft 21 and communicate with the central hole 11. To facilitate the assembly of the tongue assembly 4 into the mounting cavity 13, the center disk 101 can be divided into two or three equal parts. The divided parts can be removably connected to form a single unit via snaps, screws, or other fastening methods. The tongue assembly 4 is installed in the mounting cavity 13, with the positioning portion 13 of the tongue 43 of the tongue assembly 4 oriented toward the central axis of the central hole 11.

[0060] Multiple vertically arranged beveled slots are evenly spaced circumferentially around the drive shaft 21 at locations corresponding to the mounting cavity 13. Each beveled slot has a vertical edge and an inclined edge connected at an acute angle. The vertical edge extends vertically and is perpendicular to the central axis of the drive shaft 21 and the horizontal plane, respectively, and serves to securely retain the positioning portion 431, preventing it from falling out of the beveled slot. The inclined edges are arranged circumferentially and tilted from radially inward to radially outward, providing a guide to facilitate smooth insertion of the positioning portion 431 into one of the beveled slots.

[0061] During installation, the drive shaft 21 is passed through the center hole 11 of the wind wheel assembly 1 and rotated counterclockwise so that the oblique tip of the latch 43 is engaged with the oblique groove of the drive shaft 21 under the elastic force of the elastic member 42 and pressed against the vertical edge of the oblique groove to form a self-locking structure. At this time, the upper and lower groove edges of the oblique groove in the vertical direction can limit the oblique tip of the latch 43 in the upper and lower positions. When the motor 22 drives the drive shaft 21 to rotate clockwise, the latch 43 in the interlocked state will not loosen with the clockwise rotation of the drive shaft 21, thereby ensuring that the wind wheel assembly 1 does not loosen.

[0062] When the oblique tip of the latch 43 is engaged with the oblique groove of the drive shaft 21, the transmission pin 212 on the drive shaft 21 is inserted into the limiting groove 14 on the middle plate 101. Finally, the locking member 3 is screwed counterclockwise onto the threaded section 211 of the drive shaft 21 and tightened with a wrench or other tool.

[0063] Thus, the drive shaft 21 is locked to the wind wheel assembly 1 through the tongue assembly 4. During the operation of the motor, even if the locking member 3 becomes loose due to vibration or other reasons, it will not cause the wind wheel assembly to loosen, thereby solving the problem of the wind wheel assembly loosening and the failure of the range hood function.

[0064] The above are only some embodiments of the present invention. For those skilled in the art, several modifications and improvements can be made without departing from the inventive concept of the present invention, which all fall within the scope of protection of the present invention.

Claims

1. The anti-loosening mechanism of the wind wheel assembly is characterized by: include: A wind wheel assembly (1), the wind wheel assembly (1) comprising a center disk (101) and a plurality of blades (102), wherein a center hole (11) is provided at a center position of the center disk (101); A drive assembly (2) is arranged outside the wind wheel assembly (1) and has a drive shaft (21), wherein the drive shaft (21) passes through the central hole (11) and extends into the wind wheel assembly (1); A locking member (3) is disposed in the wind wheel assembly (1) and is fixedly connected to the movable end of the drive shaft (21); a tongue assembly (4), arranged between the wind wheel assembly (1) and the locking member (3) for locking the locking member (3) to the wind wheel assembly (1), or arranged between the wind wheel assembly (1) and the drive shaft (21) for locking the drive shaft (21) to the wind wheel assembly (1); The wind wheel assembly (1) has a mounting cavity (13) that opens toward the locking member (3) or the drive shaft (21); the locking member (3) or the drive shaft (21) is provided with a plurality of slots (31) facing the mounting cavity (13) and arranged circumferentially at intervals; the tongue assembly (4) is arranged in the mounting cavity (13) and has a positioning portion (431) facing the slots (31), the positioning portion (431) being engaged with one of the slots (31); The tongue assembly (4) comprises: A fixing seat (41) is disposed in the installation cavity (13) and has a receiving groove (411) communicating with the installation cavity (13), wherein the receiving groove (411) has a first groove wall surface (411a) and a second groove wall surface (411b) that are arranged opposite to each other; an elastic member (42), disposed in the accommodating groove (411) and abutting against or connecting to the second groove wall surface (411b); The latch tongue (43) is disposed in the receiving groove (411) and is clamped between the elastic member (42) and the Between the first groove wall surfaces (411a), the end of the latch tongue (43) close to the cut groove (31) is provided with the positioning portion (431), and the top of the positioning portion (431) is higher than the top of the installation cavity (13).

2. The anti-loosening mechanism of the wind wheel assembly according to claim 1, characterized in that: The positioning portion (431) is a wedge-shaped positioning block with a small end close to the cutting groove (31) and a large end at the other end; the cutting groove (31) is an oblique groove that cooperates with the wedge-shaped positioning block.

3. The anti-loosening mechanism of the wind wheel assembly according to claim 1, characterized in that: The first groove wall surface (411a) is arranged obliquely in the vertical direction, the second groove wall surface (411b) is arranged horizontally or obliquely in the vertical direction, and the angle between the second groove wall surface (411b) and the first groove wall surface (411a) is an acute angle; the latch tongue (43) has an upper inclined surface adapted to the first groove wall surface (411a).

4. The anti-loosening mechanism of the wind wheel assembly according to claim 1, characterized in that: The elastic member (42) comprises a first elastic surface (421) and a second elastic surface (422) connected in a "V" shape, the second elastic surface (422) being connected to or abutting against the second groove wall surface (411b), and the first elastic surface (421) being connected to or abutting against the latch tongue (43), for pressing the latch tongue (43) against the first groove wall surface (411a).

5. The anti-loosening mechanism of the wind wheel assembly according to claim 1, characterized in that: A connecting portion (432) is provided at one end of the latch tongue (43) away from the positioning portion (431), and a countersunk hole (412) communicating with the accommodating groove (411) is provided at a position of the fixing seat (41) corresponding to the connecting portion (432), and the connecting portion (432) is rotatably inserted into the countersunk hole (412).

6. The anti-loosening mechanism of the wind wheel assembly according to claim 1, characterized in that: The installation cavity (13) comprises a first cavity (131) and a second cavity (132) which are connected to each other. The fixing seat (41) is installed in the first cavity (131) with the opening of the receiving groove (411) facing the second cavity (132). The positioning portion (431) can rotate between being pressed into the second cavity (132) and extending out of the second cavity (132).

7. The anti-loosening mechanism of the wind wheel assembly according to claim 1, characterized in that: The bottom of the middle disk (101) of the wind wheel assembly (1) is provided with a limiting groove (14) opening toward the driving assembly (2), and the driving shaft (21) is provided with a transmission pin (212) cooperating with the limiting groove (14), and the transmission pin (212) is engaged with the limiting groove (14).

8. A range hood, characterized in that: It comprises the wind wheel assembly anti-loosening mechanism according to any one of claims 1 to 7.

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