Centrifugal fan for range hood and range hood

Abstract

The utility model relates to a centrifugal fan for a range hood and the range hood, and the centrifugal fan comprises a motor, a centrifugal fan and a fan cover, the impeller assembly comprises an impeller and a wheel disc used for being connected with the impeller, and the wheel disc is connected with an output shaft of the motor through a locking assembly; the front portion of a locking base of the locking assembly is further provided with an installation cavity communicated with the movable cavity and a display opening penetrating from the front wall face of the locking base to the installation cavity, and an indicating finger capable of moving front and back relative to the locking base is arranged in the installation cavity. The output shaft of the motor abuts against the pointer forwards so that the front end of the pointer can be exposed at the display opening. The front end of the output shaft of the motor installed in place is in contact with and abuts against the rear end of the pointer, and the front end of the pointer is exposed at the display opening and is seen by an operator, so that the impeller and the locking assembly are prompted to be installed in place.

Description

TECHNICAL FIELD

[0001] The utility model relates to range hood technical field especially, relates to a centrifugal fan for range hood and range hood. BACKGROUND

[0002] Range hood is a kind of kitchen appliance that purifies kitchen environment.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 increase.But the impeller of traditional centrifugal fan is forced pre-tightening, so that hand nut cannot be easily unscrewed by hand, which causes inconvenience for user to clean or technician to clean, and the cleaning experience is poor.The installation process of impeller also basically needs special tools, which causes low production efficiency and high cost.

[0003] Therefore, the Chinese utility model patent application No.CN202020410167.6 (authorized announcement No.CN211976966U) discloses a range hood wind wheel mounting structure, which includes a wind wheel and a motor.The wind wheel is mounted on the motor shaft of the motor, and a locking device is arranged on the wind wheel.The locking device includes a clamping mechanism and a lock block for unlocking the clamping mechanism.A recess is arranged on the motor shaft to cooperate with the clamping mechanism.During installation, the wind wheel can be placed in the specified position of the motor shaft by pressing the lock block to open the clamping mechanism and then releasing the lock block, which can complete the installation simply and conveniently.During disassembly, the wind wheel can be removed by pressing the lock block.Again, the Chinese utility model patent application No.CN201620412165.4 (authorized announcement No.CN205714939U) also discloses a centrifugal fan structure with quick detachable impeller.

[0004] However, the existing quick-detachable centrifugal fan still has some deficiencies.For the quick-detachable centrifugal fan, the operator cannot confirm whether the output shaft of the motor and the impeller have been locked in place by the locking assembly.If the impeller is not locked in place, the impeller may gradually loosen during rotation and eventually fall off the motor output shaft, which poses a significant safety hazard.Even if the impeller does not completely fall off, if it is not locked in place, the connection between the impeller and the motor output shaft will not be tight enough, which will cause the impeller to vibrate during rotation, and ultimately lead to unbalanced rotation of the impeller, affecting the working performance of the centrifugal fan.

[0005] Therefore, the existing centrifugal fan for range hood needs further improvement. UTILITY MODEL CONTENTS

[0006] The first technical problem to be solved by the utility model is to provide a centrifugal fan for range hood that can help operators better identify whether the impeller is installed in place.

[0007] The second technical problem to be solved by the utility model is to provide a range hood using the centrifugal fan.

[0008] The utility model solves the above-mentioned first technical problem by adopting the following technical scheme: a centrifugal fan for a range hood, comprising:

[0009] A motor has an output shaft, and the output shaft of the motor has a locking position;

[0010] A 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;

[0011] The locking assembly comprises:

[0012] A locking seat has a mounting channel for inserting the output shaft of the motor and a movable chamber communicating with the mounting channel,

[0013] A limiting slider is movably arranged in the movable chamber, and the limiting slider is provided with a locking part for forming axial limiting with the locking position of the output shaft of the motor, and the limiting slider has at least a locking state and an unlocking state according to the change of its moving position;

[0014] A first elastic member acts on the limiting slider and makes the limiting slider always have a tendency to move from the position of the unlocking state to the position of the locking state;

[0015] The front part of the locking seat is further provided with a mounting chamber communicating with the movable chamber and a display port penetrating from the front wall of the locking seat to the mounting chamber, and the mounting chamber is provided with an indicating needle capable of moving back and forth relative to the locking seat, the rear end of the indicating needle extends into the movable chamber, and the mounting chamber is further provided with a third elastic member, which acts on the indicating needle and makes the indicating needle always have a tendency to move backward, and when the impeller is in the installed state, the output shaft of the motor presses the indicating needle forward to make the front end of the indicating needle exposed at the display port.

[0016] The "impeller in the installed state" can be understood as the output shaft of the motor being locked in place by the locking assembly, and the limiting slider also being in the locking state, in which state, the drive shaft of the motor has also moved forward to the limit position relative to the impeller, and is sufficient to press the indicating needle forward to make the front end of the indicating needle exposed at the display port.

[0017] The "front end of the indicating needle exposed at the display port" can mean that the front end of the indicating needle does not extend out of the display port, but can be observed from the outside, or the front end of the indicating needle extends out of the display port.

[0018] In order to facilitate the installation of the limiting slide and other components, the locking seat comprises a seat body having a front opening movable slot and a cover body covering the front opening of the seat body to define the movable chamber, and the cover body is provided with the installation chamber and display opening.

[0019] In order to facilitate the installation of the indicating needle and the third elastic member and other components, the cover body comprises a cover main body and a protrusion detachably connected to the front side of the cover main body, the protrusion and the cover main body jointly define the installation chamber, and the front end of the protrusion is provided with the display opening. The protrusion can be connected to the cover main body by screw connection or buckle connection. The design of the detachable protrusion can facilitate the installation of the indicating needle and the third elastic member. It is conceivable that when the thickness of the cover main body, i.e. the front-to-back dimension, is sufficient, the protrusion can also be omitted. The protrusion can also be designed integrally with the cover main body, and a corresponding detachable blocking member is arranged on the inner side of the cover main body.

[0020] The third elastic member can adopt various existing technologies, which can include compression springs, torsion springs, spring leaves and various elastic elements. In order to better cooperate with the indicating needle, a front-to-back through first through hole is formed in the cover main body, the rear end of the indicating needle extends into the movable chamber through the first through hole, the outer peripheral wall of the indicating needle is further provided with a first limiting stop flange protruding outward, the third elastic member is a spring, and the spring is sleeved outside the indicating needle and abuts between the first limiting stop flange and the protrusion.

[0021] In order to facilitate the operator to more easily identify the position state of the indicating needle, at least the front end of the indicating needle is provided with an easily identifiable color. The easily identifiable color can be a color such as red, or white or black.

[0022] As an improvement, the limiting slide is movably arranged in the movable chamber in the transverse direction. 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. In the unlocked state, the locking portion of the limiting slide releases the limit on 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.

[0023] As an improvement, the locking seat is further provided with an operation opening penetrating from the outer wall surface of the locking seat to the movable chamber.

[0024] The locking assembly further comprises:

[0025] The unlocking operation member is arranged on the limiting slider and can be switched between a first position and a second position. The unlocking operation member comprises a rotating connecting part connected with the limiting slider in the movable chamber and an operation part extending outward from the rotating connecting part through the operation port. The operation part further has a lateral protruding limiting stop part. When the unlocking operation member is in the first position, the limiting stop part is limited at the outer peripheral edge of the operation port to prevent the operation part from entering the movable chamber through the operation port. When the unlocking operation member is in the second position, the limiting stop part is moved to a position opposite to the operation port to allow the operation part to enter the movable chamber through the operation port under the pressing of external force, and then the unlocking operation member applies pressure to the limiting slider to perform unlocking.

[0026] The second elastic member acts on the unlocking operation member to always have a tendency of moving the unlocking operation member from the second position to the first position.

[0027] In the natural state, i.e. without external force, the lateral protruding limiting stop part on the operation part of the unlocking operation member is limited at the outer peripheral edge of the operation port of the locking seat, which can prevent the operation part from entering the movable chamber through the operation port. Thus, the locking assembly is not easily unlocked by mistake due to the pressing of external force, and the locking reliability of the locking assembly is ensured. When unlocking is needed, the unlocking operation member is pulled (against the elastic force of the second elastic member) to move the limiting stop part to a position opposite to the operation port, and then the operation part is pressed to apply pressure to the limiting slider by the unlocking operation member to perform unlocking. The unlocking operation process is convenient and fast. After unlocking is completed, the unlocking operation member is released and automatically returns to the initial position under the elastic force of the second elastic member and the first elastic member.

[0028] In the optional solution, the locking position of the output shaft of the motor and the locking part of the limiting slider 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 limiting structure in the axial direction. Preferably, the output shaft of the motor has an inner recessed annular limiting groove on the outer peripheral wall, which constitutes the locking position.

[0029] The mounting channel has a front port connected with the movable chamber. The limiting slider has a locking hole passing through the front and back at a position opposite to the front port of the mounting channel. The outer peripheral edge of the locking hole can be clamped into the annular limiting groove, thereby constituting the locking part.

[0030] In order to limit the output shaft of the motor and the wheel disc in the circumferential direction, the output shaft of the motor is also provided with a radially extending limiting rod adjacent to the main body of the motor, and the side of the wheel disc facing the motor is provided with a boss extending towards the motor, and the boss is provided with a limiting notch for clamping the limiting rod.

[0031] The utility model discloses a kind of range hood, including fan system, the fan system uses the centrifugal fan of above-mentioned range hood.

[0032] Compared with prior art, the utility model has the advantages that: the impeller disc and the output shaft of the motor are locked by the locking assembly, when installing, the front end of the output shaft of the motor in place will contact with the rear end of the indicator, the front end of the indicator is exposed at the display port, which is visible to the operator, which means that the impeller and the locking assembly are installed in place. If not installed in place, the front end of the motor output shaft will be away from the indicator, the indicator will retract under the elastic action of the third elastic member, the front end of the indicator will not be exposed at the display port, and the operator will not easily see it, thereby prompting the operator that the impeller or the locking assembly is not installed in place. 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 centrifugal fan of the utility model embodiment after removing components such as volute and impeller body;

[0035] Figure 3 It is a right view of the impeller mounting structure of the centrifugal fan of the utility model embodiment after removing components such as volute and impeller body;

[0036] Figure 4 It is a sectional view of the impeller mounting structure of the centrifugal fan of the utility model embodiment after removing components such as volute and impeller body along the axial direction;

[0037] Figure 5 It is a three-dimensional structure schematic view of the impeller mounting structure of the utility model embodiment after removing the cover of the locking seat;

[0038] Figure 6 It is a front view of the impeller mounting structure of the utility model embodiment after removing the cover of the locking seat (the unlocking operation piece is in the first position);

[0039] Figure 7 It is a front view of the impeller mounting structure of the utility model embodiment after removing the cover of the locking seat (the unlocking operation piece is in the second position);

[0040] Figure 8 Figure 2 is an exploded view of the impeller mounting structure of the centrifugal fan of the present application, with the volute and impeller body omitted;

[0041] Figure 9 Figure 5 is a perspective view of the unlocking operation member of the present application;

[0042] Figure 10 Figure 6 is a perspective view of the locking seat and wheel disc of the present application;

[0043] Figure 11 Figure 7 is an axial sectional view of the impeller mounting structure of the centrifugal fan of the present application, with the volute and impeller body omitted (the front end of the indicator needle is in the exposed state);

[0044] Figure 12 Figure 8 is an axial sectional view of the impeller mounting structure of the centrifugal fan of the present application, with the volute and impeller body omitted (the front end of the indicator needle is in the non-exposed state). DETAILED DESCRIPTION

[0045] The present application will be further described in detail below with reference to the accompanying drawings.

[0046] 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 terms are used in this disclosure and / or in the claims, those terms are to be interpreted both to refer to the structure as well as to refer to the components of that structure. When terms are used in this disclosure and / or in the claims, those terms are to be interpreted both to refer to the structure as well as to refer to the components of that structure. Directional terms as used in this disclosure, such as "front", "back", "up", "down", "left", "right", "side", "top", "bottom", and the like, are made only for the purpose of illustrating the present application and are not intended to be limiting. The directional terms are relative terms and are determined based on the example orientation shown in the drawings. The directional terms are used only for the purpose of illustration and should not be considered limiting. For example, "up" and "down" are not necessarily limited to the direction opposite or consistent with the direction of gravity.

[0047] Figures 1-12 A preferred embodiment of the centrifugal fan and range hood of the present application is shown. The range hood includes a housing and a centrifugal fan disposed in the housing. The housing generally includes a fan frame and a hood disposed at the bottom of the fan frame. The inner cavity of the fan frame is in communication with the inner cavity of the hood. An air inlet is formed in the front side wall of the hood, and external smoke can enter the hood through the air inlet. The centrifugal fan is disposed in the fan frame, and the centrifugal fan generates negative pressure when it operates, so that external oil fume can be sucked into the hood through the air inlet. The bottom of the hood is generally provided with an oil cup, which is a left-right extending strip-shaped structure and is used to receive oil stains flowing down from the hood.

[0048] 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. A middle disc 111 of the impeller 11 is connected with a wheel disc 1111, the wheel disc 1111 is sleeved on an output shaft 121 of the motor 12 and is locked by a locking assembly arranged on a front end of the output shaft 121 of the motor 12, so that the wheel disc 1111 is limited in the axial direction.

[0049] Referring to Figure 3 , the output shaft 121 of the motor 12 is also provided with radially extending limiting rods 1211 adjacent to a main body of the motor 12. The wheel disc 1111 is provided with a boss 1112 extending towards the motor 12 on a side facing the motor 12, and the boss 1112 is provided with limiting notches 1113 for the limiting rods 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 rods 1211 and the limiting notches 1113, so that the motor 12 drives the wheel disc 1111 (the impeller 11) to rotate.

[0050] Referring to Figures 4-10 , the locking assembly comprises a locking seat 2, a limiting slide block 3, an unlocking operating member 4, a first elastic member 51 and a second elastic member 52.

[0051] The locking seat 2 is designed in a cylindrical shape. The locking seat 2 comprises a seat body 21 with an open front part and a cover body 22 covering the open front part of the seat body 21. A middle part of the seat body 21 of the locking seat 2 is provided with an installation channel 20 extending through the front and back parts for the output shaft 121 of the motor 12 to be inserted therein. The cover body 22 and the seat body 21 further define a movable chamber 201 located on the front side of the installation channel 20, and the movable chamber 201 is in communication with the front end of the installation channel 20. An operating port 203 extending through the movable chamber 201 is formed on the outer wall surface (specifically, the circumferential side wall) of the seat body 21 of the locking seat 2.

[0052] The limiting slide block 3 is movably arranged in the movable chamber 201 in the transverse direction. Specifically, the limiting slide block 3 is a rectangular block structure, and the inner wall of the movable chamber 201 of the locking seat is provided with a limiting slide channel 202 extending in the transverse direction, and the limiting slide block 3 is limited to slide in the limiting slide channel 202, so that the limiting slide block 3 can stably slide in the movable chamber 201.

[0053] The outer circumferential wall of the output shaft 121 of the motor 12 has an inwardly recessed annular limiting groove 1210, which constitutes a locking position of the output shaft 121 of the motor 12. Correspondingly, the limiting slide 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 slide 3 of the present embodiment has at least a locking state and an unlocking state with the change of its moving position. In the locking state, the locking portion 32 of the limiting slide 3 forms limiting with the locking position of the motor 12 to restrict the backward movement of the output shaft 121 of the motor 12, and in the unlocking state, the locking portion 32 of the limiting slide 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.

[0054] The mounting channel 20 of the locking seat 2 has a front port communicating with the movable cavity 201, and the limiting slide 3 has a front-to-rear through locking hole at a position opposite to the front port of the mounting channel 20, wherein the outer circumferential 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 slide 3. In particular, 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 operation port 203 of the locking seat 2 than the small hole portion 322 (i.e. closer to the unlocking operation member 4 provided at the operation port 203), and 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 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 slide 3 can make the outer circumferential edge of the small hole portion 322 clamped into the annular limiting groove 1210, thereby realizing the axial limiting of the output shaft 121 of the motor 12 and the limiting slide 3.

[0055] The first elastic member 51 is a compression spring provided in the movable cavity 201 of the locking seat 2. In particular, in order to realize the firm positioning of the compression spring, the side of the limiting slide 3 away from the operation port 203 is provided with a positioning column 33 extending away from the operation port 203, and one end of the compression spring is sleeved on the positioning column 33 and abuts against the limiting slide 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 3 always has a tendency to move from the position in the unlocking state to the position in the locking state, i.e. a tendency to move toward the position of the operation port 203.

[0056] The unlocking operation member 4 is arranged on the limiting sliding block 3 and rotates. The unlocking operation member 4 comprises a rotating connecting part 41 arranged in the movable cavity 201 and connected with the limiting sliding block 3, and an operation part 42 extending outward from the rotating connecting part 41 through the operation port 203. Specifically, the limiting sliding block 3 has a positioning pin shaft 31, and 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 part 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 with other components during the rotation of the unlocking operation member 4, the outer diameter of the rotating shaft hole 410 can be slightly larger than the outer diameter of the positioning pin shaft 31, so that the unlocking operation member 4 can have a certain floating or moving space relative to the positioning pin shaft 31, thereby avoiding interference with other components during the rotation of the unlocking operation member 4.

[0057] Referring to Figure 9 , the operation part 42 of the unlocking operation member 4 further has a laterally protruding limiting stop part 421, so that the laterally protruding limiting stop part 421 of the operation part 42 forms a hook-shaped structure. Referring to Figure 6 and Figure 7 , the unlocking operation member 4 can be switched between the first position and the second position. The second elastic member 52 can be a torsion spring, which is sleeved on the positioning pin shaft 31 of the limiting sliding block 3. The first end of the torsion spring abuts against the limiting sliding block 3, and the second end abuts 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 laterally protruding limiting stop part 421 of the operation part 42 of the unlocking operation member 4 is limited at the outer peripheral edge of the operation port 203 of the locking seat, so that the operation part 42 cannot enter the movable cavity 201 through the operation port 203, and thus the locking assembly cannot be easily unlocked by the unlocking operation member 4 pressed inward, thereby ensuring the reliability of the locking assembly. When unlocking is needed, the unlocking operation member 4 is pulled (against the elastic force of the second elastic member 52) to move the limiting stop part 421 to a position opposite to the operation port 203, and then the operation part 42 is pressed to press the unlocking operation member 4 against the limiting sliding block 3 to unlock, so that the unlocking operation is convenient and fast. After the unlocking is completed, the unlocking operation member 4 is released and automatically returns to the initial position under the elastic force of the second elastic member 52 and the first elastic member 51.

[0058] The rotating connecting part 41 further has a second limiting flange 43 extending laterally, which abuts against the side of the limiting sliding block 3 facing the operation opening 203. Specifically, in order to adapt to the rotating action of the unlocking operation piece 4, the second limiting flange 43 is designed as an arc structure, and the side of the limiting sliding block 3 facing the operation opening 203 is also designed as an arc surface structure with smooth transition, wherein the curvature radius of the arc surface structure of the limiting sliding block 3 is smaller than that of the second limiting flange 43, so as to avoid the interference between the second limiting flange 43 and the limiting sliding block 3 to the rotation of the unlocking operation piece 4.

[0059] In the preferred embodiment, the main body (i.e. the seat body 21) of the locking seat 2 is integrated with 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 and connected through screws or other fasteners.

[0060] Referring to Figure 11 and Figure 12 , the front part of the locking seat 2 is further provided with a mounting chamber 2220 communicating with the movable chamber 201 and a display opening 2221 extending from the front wall of the locking seat 2 to the mounting chamber 2220. The seat body 21 of the locking seat 2 has a movable slot with an open front part, and the cover 22 covers the open front part of the seat body 21 to define the movable chamber 201 for accommodating the limiting sliding block 3. The cover 22 is formed with the mounting chamber 2220 and the display opening 2221 described above. In some embodiments, the cover 22 includes a cover body 221 and a protrusion 222 detachably connected to the front side of the cover body 221. Specifically, the protrusion 222 is a conical head structure, the rear end of which can be connected to the cover body 221 through screw connection or buckle connection, and the protrusion 222 and the cover body 221 together define the mounting chamber 2220, and the front end of the protrusion 222 is formed with the display opening 2221.

[0061] The installation chamber 2220 is provided with an indicating needle 23 capable of moving forward and backward relative to the locking seat 2, and the cover body 221 is provided with a first through hole 2210 extending forward and backward, wherein the rear end of the indicating needle 23 extends into the movable chamber 201 through the first through hole 2210. When the impeller 11 is in the installed state, the output shaft 121 of the motor 12 presses the indicating needle 23 forward, so that the front end of the indicating needle 23 is exposed at the display port 2221, thereby prompting the operator that the impeller 11 and the locking assembly have been installed in place. The installation chamber 2220 is further provided with a third elastic member 53, and the outer circumferential wall of the indicating needle 23 is further provided with a first limiting flange 231 protruding outward. The third elastic member 53 of the embodiment is a spring, which is sleeved outside the indicating needle 23 and abuts between the first limiting flange 231 and the inner wall of the installation chamber 2220 of the protruding block 222. Under the elastic action of the third elastic member 53, the indicating needle 23 always has a tendency to move backward, that is, to retract into the installation chamber 2220. If the impeller 11 or the locking assembly is not installed in place, the front end of the output shaft 121 of the motor 12 will be away from the indicating needle 23 or will not effectively press the indicating needle 23 (that is, the pressing is not in place), so that the indicating needle 23 will retract under the elastic action of the third elastic member 53, and the front end of the indicating needle 23 will not be exposed at the display port 2221, so that the operator can not easily see, thereby prompting the operator that the impeller 11 or the locking assembly is not installed in place.

[0062] At least the front end of the indicating needle 23 of the embodiment is provided with an easily recognizable color, thereby facilitating the operator to more easily recognize the position state of the indicating needle 23. The easily recognizable color can be a color such as red, or white or black, for example, the front end of the indicating needle 23 can be colored by painting or gluing.

Claims

1. A centrifugal fan for a range hood, comprising: The motor (12) has an output shaft (121) with a locking position on the output shaft (121); The impeller (11) assembly includes an impeller (11) and a disk (1111) for connecting to the impeller (11), the disk (1111) being connected to the output shaft (121) of the motor (12) via a locking assembly; The locking assembly includes: The locking seat (2) has a mounting hole (20) into which the output shaft (121) of the motor (12) is inserted, and a movable chamber (201) communicating with the mounting hole (20). The limiting slider (3) is movably disposed in the movable chamber (201). The limiting slider (3) is provided with a locking part (32) for axially limiting with the latch position on the output shaft (121) of the motor (12). The limiting slider (3) has at least a locked state and an unlocked state as its moving position changes. The first elastic element (51) acts on the limiting slider (3) and makes the limiting slider (3) always have the tendency to move from the position of the unlocked state to the position of the locked state. The feature is that: the front part of the locking seat (2) is also provided with an installation chamber (2220) that communicates with the movable chamber (201) and a display port (2221) that extends from the front wall of the locking seat (2) to the installation chamber (2220). The installation chamber (2220) is provided with an indicator needle (23) that can move back and forth relative to the locking seat (2). The rear end of the indicator needle (23) extends into the movable chamber (201). The installation chamber (2220) is also provided with a third elastic element (53). The third elastic element (53) acts on the indicator needle (23) and makes the indicator needle (23) always have a tendency to move backward. When the impeller (11) is in the installed position, the output shaft (121) of the motor (12) presses the indicator needle (23) forward so that the front end of the indicator needle (23) is exposed at the display port (2221).

2. The centrifugal fan for a range hood according to claim 1, characterized in that: The locking seat (2) includes a seat body (21) and a cover (22). The seat body (21) has a front-opening movable groove. The cover (22) covers the front opening of the seat body (21) to define the movable chamber (201). The cover (22) has the mounting chamber (2220) and the display port (2221) formed on it.

3. The centrifugal fan for a range hood according to claim 2, characterized in that: The cover (22) includes a cover body (221) and a protrusion (222) detachably connected to the front side of the cover body (221). The protrusion (222) and the cover body (221) together define the mounting chamber (2220). The front end of the protrusion (222) forms the display port (2221).

4. The centrifugal fan for a range hood according to claim 3, characterized in that: The cover body (221) has a first through hole (2210) that runs through the front and back. The rear end of the indicator needle (23) extends into the movable chamber (201) through the first through hole (2210). The outer peripheral wall of the indicator needle (23) also has a first limiting edge (231) that protrudes outward. The third elastic element (53) is a spring. The spring is sleeved outside the indicator needle (23) and abuts against the first limiting edge (231) and the protrusion (222).

5. The centrifugal fan for a range hood according to claim 1, characterized in that: The indicator needle (23) is provided with an easily identifiable color at least at its front end.

6. The centrifugal fan for a range hood according to any one of claims 1 to 5, characterized in that: The limiting slider (3) is movably disposed in the movable chamber (201) in the transverse direction. In the locked state, the locking part (32) of the limiting slider (3) and the locking position of the motor (12) form a limit to restrict the output shaft (121) of the motor (12) from moving backward. In the unlocked state, the locking part (32) of the limiting slider (3) releases the limit on the locking position of the motor (12) and allows the output shaft (121) of the motor (12) to move backward and disengage from the mounting hole (20) of the locking seat (2).

7. The centrifugal fan for a range hood according to claim 6, characterized in that: The locking seat (2) is also provided with an operating port (203) that extends from the outer wall of the locking seat (2) to the movable chamber (201); The locking assembly further includes: The unlocking operation component (4) is rotatably mounted on the limiting slider (3) and can rotate between a first position and a second position. The unlocking operation component (4) includes a rotating connecting part (41) located within the movable chamber (201) and connected to the limiting slider (3), and an operating part (42) extending outward from the rotating connecting part (41) through the operating port (203). The operating part (42) also has a laterally protruding limiting stop (421). When the unlocking operation component (4) is in the first position, the limiting stop (421)... 21) The operating part (42) is limited at the outer periphery of the operating port (203) to prevent the operating part (42) from entering the active chamber (201) through the operating port (203). When the unlocking operating member (4) is in the second position, the limiting stop (421) moves to a position opposite to the operating port (203) to allow the operating part (42) to enter the active chamber (201) through the operating port (203) after being pressed by external force, thereby causing the unlocking operating member (4) to press against the limiting slider (3) to unlock; The second elastic element (52) acts on the unlocking operation element (4) and makes the unlocking operation element (4) always have a tendency to move from the second position to the first position.

8. The centrifugal fan for a range hood according to claim 7, characterized in that: The output shaft (121) of the motor (12) has a concave annular limiting groove (1210) on its outer peripheral wall, and the annular limiting groove (1210) constitutes the locking position. The mounting channel (20) has a front port that communicates with the movable chamber (201). The limiting slider (3) has a locking hole that runs through the front and back at a position opposite to the front port of the mounting channel (20). The outer periphery of the locking hole can be inserted into the annular limiting groove (1210), thereby forming the locking part (32).

9. The centrifugal fan for a range hood according to claim 7, characterized in that: The output shaft (121) of the motor (12) has a radially extending limiting rod (1211) near the main body of the motor (12). The wheel (1111) has a boss (1112) extending toward the motor (12) on the side facing the motor (12). The boss (1112) has a limiting notch (1113) for the limiting rod (1211) to be inserted into.

10. A range hood, comprising a fan system, characterized in that: The fan system adopts the centrifugal fan for range hoods as described in any one of claims 1 to 9.

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