Impeller mounting structure of centrifugal fan, centrifugal fan and range hood

Abstract

The utility model relates to an impeller mounting structure of a centrifugal fan, the centrifugal fan and a range hood, and the impeller mounting structure comprises a motor, an impeller, a connecting rod and a connecting rod, the impeller assembly comprises an impeller and a wheel disc, and the wheel disc is connected with an output shaft of the motor through a locking assembly; the locking assembly comprises a locking seat provided with an operation opening; the limiting sliding block can be movably arranged in the movable cavity in the transverse direction; the unlocking operation piece is rotationally arranged on the limiting sliding block, can be rotationally switched between a first position and a second position and comprises a rotary connecting part which is located in the movable cavity and connected with the limiting sliding block and an operation part which extends outwards from the rotary connecting part through the operation opening, and the operation part is further provided with a limiting blocking part which protrudes in the side direction; and the second elastic piece acts on the unlocking operation piece and enables the unlocking operation piece to have the trend of moving from the second position to the first position all the time. The impeller locking device has the advantages that unlocking operation is convenient, and the impeller is locked more firmly.

Description

TECHNICAL FIELD

[0001] The utility model relates to centrifugal fan technical field especially, it is a kind of impeller mounting structure, centrifugal fan and range hood of centrifugal fan. BACKGROUND

[0002] Centrifugal fan is the key component of range hood, due to long time contact with oil dirt, it can seriously affect the performance of range hood and cause noise to increase.But the impeller of traditional centrifugal fan is disassembled due to forced pre-tightening, hand nut is not easy to be unscrewed by hand, which causes inconvenience for user to clean or technician to clean, and cleaning experience is poor.The installation process of impeller also basically needs to use special tool, which causes low production efficiency and high cost.

[0003] In order to solve the above technical problems, the Chinese utility model patent application with application No.CN202020410167.6 (authorized announcement No.CN211976966U) discloses a range hood wind wheel mounting structure, which comprises a wind wheel and a motor, the wind wheel is installed on the motor shaft of the motor, a locking device is arranged on the wind wheel, the locking device comprises a clamping mechanism and a lock block for unlocking the clamping mechanism, a recess matched with the clamping mechanism is arranged on the motor shaft, when installing, only need to press the lock block to open the clamping mechanism, put the wind wheel into the specified position of the motor shaft, and release the lock block to complete the installation, which is simple and convenient, when disassembling, only need to press the lock block, and the wind wheel can be taken out.

[0004] The impeller mounting structure in the above patent application still has some deficiencies: the lock block of the locking device of the wind wheel is unlocked in a straight pressing manner, but after the impeller is installed and locked, the lock block is easily unlocked by the inward pressing external force, which has certain safety hazard.

[0005] Therefore, the existing centrifugal fan impeller mounting structure still needs to be further improved. UTILITY MODEL CONTENTS

[0006] The first technical problem to be solved by the utility model is to provide a centrifugal fan impeller mounting structure with convenient unlocking operation and reliable locking in view of the status of the prior art.

[0007] The second technical problem to be solved by the utility model is to provide a centrifugal fan applying the above-mentioned impeller mounting structure in view of the status of the prior art.

[0008] The third technical problem to be solved by the utility model is to provide a range hood applying the above-mentioned centrifugal fan in view of the status of the prior art.

[0009] The technical scheme adopted by the utility model to solve the first technical problem is: a centrifugal fan impeller mounting structure, comprising:

[0010] The motor has an output shaft, and the output shaft of the motor has a locking position;

[0011] The impeller assembly comprises an impeller and a wheel disc connected to the impeller, and the wheel disc is connected to the output shaft of the motor through a locking assembly;

[0012] The locking assembly comprises:

[0013] The locking seat has a mounting hole for inserting the output shaft of the motor and a movable chamber communicating with the mounting hole, and the locking seat is further provided with an operation port penetrating from the outer wall surface of the locking seat to the movable chamber;

[0014] The limiting slide block is movably arranged in the movable chamber, and the limiting slide block is provided with a locking portion for forming axial limiting with the locking position of the output shaft of the motor, and the limiting slide block has at least a locking state and an unlocking state as the moving position changes;

[0015] The first elastic member acts on the limiting slide block and always has a tendency to move from the unlocking state position to the locking state position;

[0016] The locking assembly further comprises:

[0017] The unlocking operating member is rotatably arranged on the limiting slide block and can be rotatably switched between a first position and a second position, and the unlocking operating member comprises a rotating connecting portion connected to the limiting slide block in the movable chamber and an operating portion extending outward from the rotating connecting portion through the operation port, and the operating portion further has a laterally protruding limiting stop portion, when the unlocking operating member is in the first position, the limiting stop portion is limited at the outer peripheral edge of the operation port to restrict the operating portion from entering the movable chamber through the operation port, and when the unlocking operating member is in the second position, the limiting stop portion moves to a position opposite to the operation port to allow the operating portion to enter the movable chamber through the operation port after being pressed by external force, and then the unlocking operating member is pressed to the limiting slide block for unlocking;

[0018] The second elastic member acts on the unlocking operating member and always has a tendency to move from the second position to the first position.

[0019] In order to ensure the stable sliding of the limiting slide block in the movable chamber, a limiting sliding channel extending transversely is defined on the inner wall of the movable chamber of the locking seat, and the limiting slide block is slidingly limited in the limiting sliding channel.

[0020] In an alternative, the locking position of the output shaft of the motor and the locking portion of the limiting slide can be a limiting structure using a protrusion and a groove, or a structure using two protrusions arranged in a staggered manner to form a limit in the axial direction. Preferably, the output shaft of the motor has an annular limiting groove recessed on the outer peripheral wall, which constitutes the locking position.

[0021] The mounting channel has a front port communicating with the movable chamber, and the limiting slide has a front and rear through locking hole at a position opposite to the front port of the mounting channel, and the outer peripheral edge of the locking hole can be clamped into the annular limiting groove, thereby constituting the locking portion.

[0022] In order to make the outer peripheral edge of the locking hole clamped into the annular limiting groove as much as possible, thereby ensuring the strength between the limiting slide and the output shaft of the motor, the locking hole comprises a large hole portion and a small hole portion in communication, the large hole portion is closer to the unlocking operating member than the small hole portion, the large hole portion can pass through the output shaft of the motor, the inner diameter of the small hole portion is smaller than the outer diameter of the output shaft of the motor and larger than the diameter of the annular limiting groove, and the outer peripheral edge of the small hole portion can be clamped into the annular limiting groove, thereby constituting the locking portion.

[0023] In order to rotate the unlocking operating member to be connected to the limiting slide, the limiting slide has a positioning pin shaft, and the rotating connection portion of the unlocking operating member is provided with a rotating shaft hole for the positioning pin shaft to pass through.

[0024] The above-mentioned second elastic member can adopt various existing technologies, including compression springs, torsion springs, spring leaves and various elastic elements, but in order to better cooperate with the above-mentioned unlocking operating member, the second elastic member is a torsion spring, which is sleeved on the positioning pin shaft, and the first end of the torsion spring abuts against the limiting slide, and the second end abuts against the unlocking operating member.

[0025] Similarly, the above-mentioned first elastic member can adopt various existing technologies, including compression springs, torsion springs, spring leaves and various elastic elements, but in order to better cooperate with the above-mentioned unlocking operating member, the first elastic member is a compression spring, and the side of the limiting slide away from the operating port is provided with a positioning column extending away from the operating port, one end of the compression spring is sleeved on the positioning column and abuts against the limiting slide, and the other end of the compression spring abuts against the inner wall of the movable chamber.

[0026] In order to make the unlocking operating member (pressed by external force) more stably apply force to the limiting slide to drive the limiting slide to move, the rotating connection portion further has a laterally extending limiting stop edge, which abuts against the side of the limiting slide facing the operating port.

[0027] As an improvement, in order to simplify the installation process of the impeller, the main body of the locking seat and the wheel disc are an integral piece. It is conceivable that the locking seat and the wheel disc can also be designed in a split body, and the two are connected by screws or other fasteners.

[0028] In order to limit the output shaft of the motor and the wheel disc in the circumferential direction, the output shaft of the motor has a radially extending limiting rod adjacent to the main body of the motor, and the side of the wheel disc facing the motor has a boss extending towards the motor, and the boss is provided with a limiting notch for the limiting rod to be clamped therein.

[0029] As an improvement, in the locked state, the locking portion of the limiting slide forms a limit with the locking position of the motor to limit the rearward movement of the output shaft of the motor, and in the unlocked state, the locking portion of the limiting slide releases the limit of the locking position of the motor to allow the output shaft of the motor to move rearward out of the mounting hole of the locking seat.

[0030] The technical scheme adopted by the utility model to solve the second technical problem is: a centrifugal fan, including volute, impeller rotatingly arranged in the volute and motor, further including the impeller mounting structure of the above-mentioned centrifugal fan.

[0031] The technical scheme adopted by the utility model to solve the third technical problem is: a range hood, including fan system, the fan system adopts the centrifugal fan.

[0032] Compared with the prior art, the advantages of the utility model are: the unlocking operation piece is rotatably arranged on the limiting slide, in the natural state, that is, without external force, the limiting stop portion of the operation portion of the unlocking operation piece is limited on the outer peripheral edge of the operation port of the locking seat, which can limit the operation portion from entering the movable chamber through the operation port, so that the locking assembly is not easily unlocked by the unlocking operation piece under the action of the inward pressing external force, and the locking assembly is ensured to be locked firmly. When unlocking is needed, the unlocking operation piece can be moved (overcoming the elastic force of the second elastic member) to move the limiting stop portion to a position opposite to the operation port, and then the operation portion is pressed, the unlocking operation piece is pressed to the limiting slide to unlock, and the unlocking operation process is convenient and fast. After unlocking is completed, the unlocking operation piece is released, and the unlocking operation piece is automatically reset to the initial position under the action of the elastic force of the second elastic member and the first elastic member. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 It is a three-dimensional structure schematic view of the centrifugal fan of the utility model embodiment;

[0034] Figure 2 It is a three-dimensional structure schematic view of the impeller mounting structure of the utility model embodiment;

[0035] Figure 3 Figure 6 is a right view of the impeller mounting structure of the present application;

[0036] Figure 4 Figure 7 is a cross-sectional view of the impeller mounting structure of the present application;

[0037] Figure 5 Figure 8 is a perspective view of the impeller mounting structure of the present application without the cover of the locking seat;

[0038] Figure 6 Figure 9 is a front view of the impeller mounting structure of the present application without the cover of the locking seat (the unlocking operation member is in the first position);

[0039] Figure 7 Figure 10 is a front view of the impeller mounting structure of the present application without the cover of the locking seat (the unlocking operation member is in the second position);

[0040] Figure 8 Figure 11 is an exploded view of the impeller mounting structure of the present application;

[0041] Figure 9 Figure 12 is a perspective view of the unlocking operation member of the present application;

[0042] Figure 10 Figure 13 is a perspective view of the locking seat and the wheel disc of the present application. DETAILED DESCRIPTION

[0043] The present application will be further described in detail below with reference to the accompanying drawings.

[0044] In the description and claims of the present application, terms are used to generally refer to the structure of the application as well as the components of that structure. When the applications refer to directions, such as front, back, up, down, left, right, side, top, bottom, and the like, these terms are used for convenience and are illustrative only. Unless otherwise expressly provided herein, these terms are not intended to limit the applications of the present application to any particular direction or orientation. Terms such as "above", "below", "upper", "lower", and the like are used as relative terms to describe the relative position of one structural element to another structural element. These terms are used for convenience and are illustrative only. Unless otherwise expressly provided herein, these terms are not intended to limit the applications of the present application to any particular direction or orientation.

[0045] Figures 1-10An embodiment of the impeller mounting structure of the centrifugal fan, the centrifugal fan and the range hood is shown. The range hood comprises a casing and a centrifugal fan arranged in the casing, and the casing generally comprises a fan frame and a smoke collecting hood arranged at the bottom of the fan frame, and the inner cavity of the fan frame is in communication with the inner cavity of the smoke collecting hood. An air inlet is formed in the front side wall of the smoke collecting hood, and external smoke gas can enter the smoke collecting hood through the air inlet. The centrifugal fan is arranged in the fan frame, and negative pressure is generated when the centrifugal fan operates, and external oil fume can be sucked into the smoke collecting hood through the air inlet. The bottom of the smoke collecting hood is generally provided with an oil cup, and the oil cup is a long strip extending left and right, and is used for receiving oil stains flowing down from the smoke collecting hood.

[0046] The centrifugal fan comprises a volute 10, an impeller 11 rotatably arranged in the volute 10, and a motor 12 for driving the impeller 11 to rotate. The middle disc 111 of the impeller 11 is connected with the wheel disc 1111, the wheel disc 1111 is sleeved on the output shaft 121 of the motor 12, and is locked by a locking assembly arranged on the front end of the output shaft 121 of the motor 12, so as to realize the limiting of the two in the axial direction.

[0047] Referring to Figure 3 , the output shaft 121 of the motor 12 is also provided with a radially extending limiting rod 1211 adjacent to the main body of the motor 12, and the limiting rod 1211 is generally symmetrically arranged. The side of the wheel disc 1111 facing the motor 12 has a boss 1112 extending towards the motor 12, and the boss 1112 is provided with a limiting notch 1113 for the limiting rod 1211 to be clamped therein. The output shaft 121 of the motor 12 and the wheel disc 1111 are limited in the circumferential direction by the cooperation of the limiting rod 1211 and the limiting buckle, so as to realize the rotation of the motor 12 driving the wheel disc 1111 (impeller 11).

[0048] Referring to Figures 4-10 , the locking assembly comprises a locking seat 2, a limiting sliding block 3, an unlocking operating piece 4, a first elastic member 51 and a second elastic member 52.

[0049] The locking seat 2 can be designed as a cylindrical shape as a whole. The locking seat 2 comprises a seat body 21 with a front opening and a cover body 22 covering the front opening of the seat body 21. The middle part of the seat body 21 of the locking seat 2 is provided with an installation hole 20 penetrating front and back for inserting the output shaft 121 of the motor 12. The cover body 22 and the seat body 21 further define a movable cavity 201 located on the front side of the installation hole 20, and the movable cavity 201 is in communication with the front end of the installation hole 20. The outer wall surface (specifically the circumferential side wall) of the seat body 21 of the locking seat 2 is provided with an operating port 203 penetrating to the movable cavity 201.

[0050] The limiting sliding block 3 is movably arranged in the lateral direction in the movable chamber 201. Specifically, the limiting sliding block 3 is a rectangular block structure. A lateral extending limiting sliding channel 202 is defined on the inner wall of the movable chamber 201 of the locking seat. The limiting sliding block 3 is slidingly limited in the limiting sliding channel 202, so as to ensure that the limiting sliding block 3 can stably slide in the movable chamber 201.

[0051] The outer peripheral wall of the output shaft 121 of the motor 12 has an inner recessed annular limiting groove 1210, which constitutes a locking position of the output shaft 121 of the motor 12. Correspondingly, the limiting sliding block 3 is provided with a locking portion 32 for forming axial limiting with the locking position of the output shaft 121 of the motor 12. The limiting sliding block 3 of the embodiment has at least a locking state and an unlocking state according to the change of the moving position. In the locking state, the locking portion 32 of the limiting sliding block 3 forms limiting with the locking position of the motor 12 to limit the backward movement of the output shaft 121 of the motor 12. In the unlocking state, the locking portion 32 of the limiting sliding block 3 releases the limiting of the locking position of the motor 12 to allow the backward movement of the output shaft 121 of the motor 12 out of the mounting channel 20 of the locking seat 2.

[0052] The mounting channel 20 of the locking seat 2 has a front port communicating with the movable chamber 201. The limiting sliding block 3 has a front and rear penetrating locking hole at a position opposite to the front port of the mounting channel 20. The outer peripheral edge of the locking hole can be clamped into the annular limiting groove 1210, and the locking hole constitutes the locking portion 32 of the limiting sliding block 3. Specifically, the locking hole includes a large hole portion 321 and a small hole portion 322 communicating with each other. The large hole portion 321 is closer to the operating port 203 of the locking seat 2 (i.e. closer to the unlocking operating member 4 arranged at the operating port 203) than the small hole portion 322. The diameter of the large hole portion 321 is greater than the outer diameter of the output shaft 121 of the motor 12, so that the output shaft 121 of the motor 12 can pass through the large hole portion 321. The inner diameter of the small hole portion 322 is smaller than the outer diameter of the output shaft 121 of the motor 12 and greater than the diameter of the annular limiting groove 1210. When the output shaft 121 of the motor 12 passes through the large hole portion 321 of the locking hole, the lateral movement of the limiting sliding block 3 can make the outer peripheral edge of the small hole portion 322 clamped into the annular limiting groove 1210, so as to realize the axial limiting of the output shaft 121 of the motor 12 and the limiting sliding block 3.

[0053] The first elastic member 51 is a compression spring arranged in the movable cavity 201 of the locking seat 2. Specifically, in order to achieve firm positioning of the compression spring, the side of the limiting slide block 3 away from the operation port 203 is provided with a positioning column 33 extending away from the operation port 203, one end of the compression spring is sleeved on the positioning column 33 and abuts against the limiting slide block 3. The other end of the compression spring abuts against the inner wall of the movable cavity 201. Under the elastic action of the first elastic member 51, the limiting slide block 3 always has a tendency to move from the position in the unlocked state to the position in the locked state, that is, has a tendency to move towards the position of the operation port 203.

[0054] The unlocking operation member 4 is arranged on the limiting slide block 3 and rotates, the unlocking operation member 4 includes a rotating connecting portion 41 arranged in the movable cavity 201 and connected in rotation with the limiting slide block 3, and an operation portion 42 extending outward from the rotating connecting portion 41 through the operation port 203. Specifically, the limiting slide block 3 has a positioning pin shaft 31, the extending direction of the positioning pin shaft 31 is consistent with the extending direction of the output shaft 121 of the motor 12. The rotating connecting portion 41 of the unlocking operation member 4 is provided with a rotating shaft hole 410 for the positioning pin shaft 31 to pass through, in order to avoid interference problems of the unlocking operation member 4 in the process of rotation with other components, the outer diameter size of the rotating shaft hole 410 can be slightly larger than the outer diameter of the positioning pin shaft 31, thereby allowing the unlocking operation member 4 to have a certain floating or active space relative to the positioning pin shaft 31, avoiding interference problems of the unlocking operation member 4 with other components in the process of rotation.

[0055] Referring to Figure 9 , the operation portion 42 of the unlocking operation member 4 also has a laterally protruding limiting stop portion 421, thereby the laterally protruding limiting stop portion 421 of the operation portion 42 forms a hook-shaped structure. Referring to Figure 6 and Figure 7, the second elastic member 52 can be a torsion spring, which is sleeved on the positioning pin shaft 31 of the limiting slide block 3, wherein the first end of the torsion spring is abutted against the limiting slide block 3, and the second end is abutted against the unlocking operation member 4. Under the elastic action of the torsion spring, the unlocking operation member 4 always has a tendency to move from the second position to the first position. In the natural state, that is, without external force, the lateral protruding limiting stop portion 421 of the operation portion 42 of the unlocking operation member 4 is limited at the outer peripheral edge of the operation port 203 of the locking seat, which can limit the operation portion 42 from entering the active cavity 201 through the operation port 203, so that the unlocking operation member 4 is not easily mistaken to unlock the locking assembly due to the inward pressing external force, thereby ensuring the reliability of the locking assembly. When unlocking is needed, the unlocking operation member 4 can be moved (overcoming the elastic force of the second elastic member 52) to move the limiting stop portion 421 to a position opposite to the operation port 203, and then the operation portion 42 is pressed to make the unlocking operation member 4 press the limiting slide block 3 to unlock, and the unlocking operation process is convenient and fast. After unlocking is completed, the unlocking operation member 4 is released, and the unlocking operation member 4 is automatically reset to the initial position under the elastic force of the second elastic member 52 and the first elastic member 51.

[0056] The rotating connecting portion 41 also has a lateral extending limiting stop edge 43, which is abutted against the side of the limiting slide block 3 facing the operation port 203. Specifically, in order to adapt to the rotating action of the unlocking operation member 4, the limiting stop edge 43 is designed as an arc structure, wherein the side of the limiting slide block 3 facing the operation port 203 is also designed as an arc surface structure with smooth transition, wherein the curvature radius of the arc surface structure of the limiting slide block 3 is smaller than the curvature radius of the limiting stop edge 43, thereby avoiding the interference between the limiting stop edge 43 and the limiting slide block 3 to the rotation of the unlocking operation member 4.

[0057] In the preferred embodiment, the main body of the locking seat 2 (that is, the seat body 21) is an integral part of the wheel disc 1111, thereby simplifying the installation process of the impeller 11. Of course, it is conceivable that the locking seat 2 and the wheel disc 1111 can also be designed as separate parts, which are connected by screws or other fasteners.

Claims

1. A centrifugal fan impeller mounting structure, comprising: a motor (12) having an output shaft (121), the output shaft (121) of the motor (12) having a locking position; an impeller (11) assembly comprising an impeller (11) and a wheel plate (1111) for connecting with the impeller (11), the wheel plate (1111) being connected with the output shaft (121) of the motor (12) through a locking assembly; the locking assembly comprising: a locking seat (2) having a mounting channel (20) for inserting the output shaft (121) of the motor (12) and a movable chamber (201) communicating with the mounting channel (20), the locking seat (2) further having an operation opening (203) extending from the outer wall surface of the locking seat (2) to the movable chamber (201); a limiting sliding block (3) movably arranged in the movable chamber (201), the limiting sliding block (3) being provided with a locking portion (32) for forming axial limiting with the locking position of the output shaft (121) of the motor (12), the limiting sliding block (3) having at least a locking state and an unlocking state according to the change of the moving position; a first elastic member (51) acting on the limiting sliding block (3) and making the limiting sliding block (3) always have a tendency to move from the position of the unlocking state to the position of the locking state; characterized in that the locking assembly further comprises: an unlocking operation member (4) rotatably arranged on the limiting sliding block (3) and capable of rotatingly switching between a first position and a second position, the unlocking operation member (4) comprising a rotating connecting portion (41) connected with the limiting sliding block (3) in the movable chamber (201) and an operation portion (42) extending outward from the rotating connecting portion (41) through the operation opening (203), the operation portion (42) further having a laterally protruding limiting stop portion (421), when the unlocking operation member (4) is in the first position, the limiting stop portion (421) is limited at the outer peripheral edge of the operation opening (203) to restrict the operation portion (42) from entering the movable chamber (201) through the operation opening (203), when the unlocking operation member (4) is in the second position, the limiting stop portion (421) is moved to a position opposite to the operation opening (203) to allow the operation portion (42) to enter the movable chamber (201) through the operation opening (203) after being pressed by an external force, and then the unlocking operation member (4) is pressed to the limiting sliding block (3) for unlocking; a second elastic member (52) acting on the unlocking operation member (4) and making the unlocking operation member (4) always have a tendency to move from the second position to the first position.

2. The centrifugal fan impeller mounting structure according to claim 1, characterized by: The inner wall of the movable chamber (201) of the locking seat is defined with a laterally extending limiting sliding channel (202), and the limiting sliding block (3) is slidingly limited in the limiting sliding channel (202).

3. The centrifugal fan impeller mounting structure according to claim 1, characterized by: The outer circumferential wall of the output shaft (121) of the motor (12) has an inwardly recessed annular limiting groove (1210), which constitutes the locking position; The mounting channel (20) has a front port communicating with the movable chamber (201), and the limiting slide block (3) has a front-to-rear through locking hole at a position opposite to the front port of the mounting channel (20), and the outer circumferential edge of the locking hole can be clamped into the annular limiting groove (1210), thereby constituting the locking portion (32).

4. The centrifugal fan impeller mounting structure according to claim 3, characterized by: The locking hole comprises a large hole portion (321) and a small hole portion (322) in communication, the large hole portion (321) is closer to the unlocking operating member (4) than the small hole portion (322), the large hole portion (321) can pass through the output shaft (121) of the motor (12), the inner diameter of the small hole portion (322) is smaller than the outer diameter of the output shaft (121) of the motor (12) and larger than the diameter of the annular limiting groove (1210), and the outer circumferential edge of the small hole portion (322) can be clamped into the annular limiting groove (1210), thereby constituting the locking portion (32).

5. The centrifugal fan impeller mounting structure according to claim 1, characterized by: The limiting slide block (3) has a positioning pin shaft (31), and the rotating connecting portion (41) of the unlocking operating member (4) is provided with a rotating shaft hole (410) through which the positioning pin shaft (31) passes.

6. The centrifugal fan impeller mounting structure according to claim 5, characterized by: The second elastic member (52) is a torsion spring, which is sleeved on the positioning pin shaft (31), and one end of the torsion spring abuts against the limiting slide block (3), and the other end abuts against the unlocking operating member (4).

7. The centrifugal fan impeller mounting structure according to claim 1, characterized by: The first elastic member (51) is a compression spring, and the side of the limiting slide block (3) away from the operating port (203) is provided with a positioning column (33) extending away from the operating port (203), one end of the compression spring is sleeved on the positioning column (33) and abuts against the limiting slide block (3), and the other end abuts against the inner wall of the movable chamber (201).

8. The centrifugal fan impeller mounting structure according to claim 1, characterized by: The rotating connecting portion (41) further has a laterally extending limiting stop edge (43) abutting against the side of the limiting slide block (3) facing the operating port (203).

9. The centrifugal fan impeller mounting structure according to claim 1, characterized by: The main body of the locking seat (2) and the wheel disc (1111) are an integral piece.

10. The centrifugal fan impeller mounting structure according to claim 1, characterized by: The output shaft (121) of the motor (12) further has a radially extending limiting rod (1211) adjacent to the main body of the motor (12), and the side of the wheel disc (1111) facing the motor (12) has a boss (1112) extending towards the motor (12), and the boss (1112) is provided with a limiting notch (1113) into which the limiting rod (1211) is clamped.

11. The impeller mounting structure of a centrifugal fan according to any one of claims 1 to 10, characterized in that: In the locking state, the locking part (32) of the limiting slider (3) limits the locking position of the motor (12) to limit the rearward movement of the output shaft (121) of the motor (12), and in the unlocking state, the locking part (32) of the limiting slider (3) releases the locking position of the motor (12) to allow the rearward movement of the output shaft (121) of the motor (12) to move out of the mounting channel (20) of the locking seat (2).

12. A centrifugal fan comprising a volute (10), an impeller (11) rotatably arranged in said volute (10), and an electric motor (12), characterized in that: Also included is an impeller mounting structure of the centrifugal fan according to any one of claims 1 to 11.

13. A range hood comprising a fan system, characterized by: The fan system adopts the centrifugal fan according to claim 12. The fan system adopts the centrifugal fan according to claim 12.

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