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 volute, a centrifugal fan and a fan cover, the motor is provided with an output shaft, and the output shaft of the motor is provided with a lock catch position; 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; a protective net is further arranged at the position of an air inlet of the volute, an extending piece which extends forwards and has toughness is further arranged on the front side of the locking seat, the extending piece is not in contact with the protective net when the impeller is in the in-place installation state, and the extending piece is in contact with the protective net when the impeller is not in the in-place installation state. When the impeller and the locking assembly are not installed in place, the extending piece can make contact with the protective net, sand friction sound can be made during operation, and therefore a user is reminded that reinstallation is needed.

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 with impeller still has some deficiencies.For the quick-detachable centrifugal fan with impeller, 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, leading to unbalanced rotation of the impeller and 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 timely remind the operator whether the impeller is installed in place in view of the current status of the prior art.

[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 first technical problem by adopting the following technical scheme: a centrifugal fan for a range hood, comprising:

[0009] A volute has an air inlet.

[0010] A motor has an output shaft, and the output shaft of the motor has a locking position.

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

[0012] The locking assembly comprises:

[0013] A locking seat has a mounting channel for inserting the output shaft of the motor and a movable cavity connected to the mounting channel,

[0014] A limiting slider is movably arranged in the movable cavity, 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 with the change of its moving position.

[0015] 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.

[0016] The air inlet of the volute is also provided with a protective net, and the front side of the locking seat is also provided with a flexible extension member extending forward, and the extension member is not in contact with the protective net when the impeller is in the installed state, and the extension member is in contact with the protective net when the impeller is not installed.

[0017] The "flexible extension member" can be understood as the extension member can be bent and deformed under external force, and can return to the initial state after the external force is removed, which can be a plastic part, a metal part, etc.

[0018] In order to reduce the cost, the extension member is a plastic part which can be bent and deformed under external force and can return to the initial state after the external force is removed. If the impeller is not installed in place, the front end of the extension member will be in contact with the protective net, and the plastic card will emit an easily identifiable friction sound (such as rustling sound) when the centrifugal fan is running, reminding the operator that the impeller is not installed in place.

[0019] The extension member can be a strip or a sheet, and in order to facilitate installation on the front side of the locking seat, the extension member is a plastic card.

[0020] As an improvement, the extension member is connected to the front side of the locking seat by a fastener. The fastener can be a screw.

[0021] In order to enable the extension member to have a larger moving distance relative to the protective net when the motor drives the impeller to rotate, thereby emitting a more obvious sound, the extension member is arranged eccentrically relative to the axis of the output shaft of the motor at the arranged position on the front side of the locking seat. Of course, it is also conceivable that the extension member can be arranged at the middle position on the front side of the locking seat, i.e. on the axis of the output shaft of the motor, only that the sound produced by the friction between the extension member and the protective net is relatively less obvious.

[0022] In order to increase the sound produced by the friction between the extension member and the protective net, thereby better identifying whether the impeller is installed in place, the extension member has at least two, and each of the extension members is arranged in sequence along the circumference with the axis of the output shaft of the motor as the center line.

[0023] As an improvement, in order to increase the effective air inlet area as much as possible, the protective net is an arc-shaped net with the middle part protruding forward.

[0024] As an improvement, the limiting slide is movably arranged in the movable chamber in the transverse direction, and 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 on the locking position of the motor to allow the rearward movement of the output shaft of the motor out of the mounting hole of the locking seat.

[0025] In order to ensure the locking firmness of the locking assembly and avoid the risk of unlocking due to accidental touch, the locking seat is further provided with an operation opening penetrating from the outer wall surface of the locking seat to the movable chamber;

[0026] The locking assembly further comprises:

[0027] The unlocking operation member is rotatably arranged on the limiting slide and can be switched between a first position and a second position. The unlocking operation member comprises a rotating connection portion connected to the limiting slide in the movable chamber and an operation portion extending outward from the rotating connection portion through the operation opening. The operation portion further has a laterally protruding limiting stop portion. When the unlocking operation member is in the first position, the limiting stop portion is limited at the outer peripheral edge of the operation opening to restrict the operation portion from entering the movable chamber through the operation opening. When the unlocking operation member is in the second position, the limiting stop portion moves to a position opposite to the operation opening to allow the operation portion to enter the movable chamber through the operation opening under the pressing of external force, thereby enabling the unlocking operation member to press the limiting slide for unlocking.

[0028] The second elastic member acts on the unlocking operation member and makes the unlocking operation member always have a tendency to move from the second position to the first position.

[0029] Since the unlocking operation member is rotatably arranged on the limiting slider, in a natural state, i.e., without external force, the upward protruding limiting stop portion on the operation portion of the unlocking operation member is limited at the outer peripheral edge of the operation port of the locking seat, and the operation portion can be prevented from entering the active chamber through the operation port, so that the unlocking operation member is not easily unlocked by an inward pressing external force, and the locking reliability of the locking assembly is ensured. When unlocking is needed, the unlocking operation member is moved (against the elastic force of the second elastic member) to a position opposite to the operation port, and then the operation portion is pressed to make the unlocking operation member press the limiting slider to unlock, so that the unlocking operation is convenient and fast. After unlocking is completed, the unlocking operation member is released, and the unlocking operation member is automatically reset to the initial position under the elastic force of the second elastic member and the first elastic member.

[0030] As an improvement, a flow collector is arranged at the air inlet of the volute, and the protective net is arranged on the flow collector.

[0031] In order to improve the dismounting efficiency of the flow collector, the flow collector comprises a flow guiding portion in the form of a ring and a connecting ring extending radially outward from the flow guiding portion, and a locking knob is further arranged on the connecting ring. The locking knob comprises a knob main body rotatably arranged on the connecting ring and a limiting rib arranged on the knob main body. A limiting hole is arranged on the front side plate of the volute and extends through the front side plate and the rear side plate, and the limiting hole is used for allowing the limiting rib to pass through. The locking knob has at least a locking state in which the limiting rib is limited at the rear side of the outer peripheral edge of the limiting hole to prevent the limiting rib from being pulled out of the limiting hole, and an unlocking state in which the limiting rib is moved to a position opposite to the limiting hole to allow the limiting rib to be pulled out of the limiting hole.

[0032] The flow collector is connected to the front side plate of the volute by the locking knob. When the flow collector needs to be mounted on the front side plate of the volute, the limiting rib of the locking knob is only needed to pass through the limiting hole on the front side plate of the volute and then be rotated by a certain angle, so that the limiting rib is limited at the rear side of the outer peripheral edge of the limiting hole and cannot be pulled out of the limiting hole, and the locking state is achieved. When the flow collector needs to be dismounted, the locking knob is rotated to a position in which the limiting rib is opposite to the limiting hole, so that the limiting rib can be pulled out of the limiting hole to achieve the unlocking state. The locking and unlocking modes of the locking knob make it more convenient for the operator to operate, the dismounting process is more labor-saving, and the loosening or disengagement problem caused by the movement and vibration of the fan is less likely to occur, so that the locking reliability between the flow collector and the front side plate of the volute is ensured.

[0033] The utility model discloses a technology scheme that the second technical problem is solved is: a range hood, including fan system, fan system adopts the centrifugal fan of above.

[0034] Compared with the prior art, the utility model has the advantages that: the impeller disc of the impeller and the output shaft of the motor are locked by the locking assembly, the front part of the locking seat of the locking assembly is provided with a flexible extension piece, when the impeller and the locking assembly are normally installed in place, the extension piece has a certain distance from the protective net at the air inlet of the volute, when the impeller rotates and works, the extension piece will not rub and contact the protective net to emit sound. When the impeller and the locking assembly are not installed in place, the extension piece will contact the protective net, and when running, it will emit a rustling friction sound, thereby reminding the user to reinstall. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1 It is the three-dimensional structure schematic diagram of centrifugal fan of the utility model embodiment;

[0036] Figure 2 It is the three-dimensional structure schematic diagram of centrifugal fan of the utility model embodiment's current collector is in the separation state;

[0037] Figure 3 It is the sectional view of the utility model embodiment's centrifugal fan after cutting along the axial direction;

[0038] Figure 4 It is the sectional view of the utility model embodiment's impeller mounting structure after cutting along the axial direction after the volute and impeller main body of centrifugal fan of the utility model embodiment are removed;

[0039] Figure 5 It is the three-dimensional structure schematic diagram of the impeller mounting structure of the utility model embodiment and removes the cover of locking seat;

[0040] Figure 6 It is the front view of the impeller mounting structure of the utility model embodiment and removes the cover of locking seat (the unlocking operation piece is in the first position);

[0041] Figure 7 It is the front view of the impeller mounting structure of the utility model embodiment and removes the cover of locking seat (the unlocking operation piece is in the second position);

[0042] Figure 8 It is the exploded view of the impeller mounting structure of the utility model embodiment after removing the volute and impeller main body of centrifugal fan of the utility model embodiment;

[0043] Figure 9 It is the three-dimensional structure schematic diagram of the unlocking operation piece of the utility model embodiment;

[0044] Figure 10A three-dimensional structure schematic view of the locking seat and the wheel disc of the embodiment of the utility model is designed integrally.

[0045] Figure 11 A right view of the current collector of the centrifugal fan of the embodiment of the utility model.

[0046] Figure 12 An exploded view of the current collector mounting structure of the embodiment of the utility model.

[0047] Figure 13 A three-dimensional structure schematic view of the local area of the current collector of the embodiment of the utility model.

[0048] Figure 14 A rear view of the front side plate of the volute of the embodiment of the utility model after installing the current collector (the locking knob is in the locking state). DETAILED DESCRIPTION

[0049] The utility model will be described in further detail below in combination with the embodiment of the drawings.

[0050] In the description and claims of the utility model, directional terms such as "front", "rear", "upper", "lower", "left", "right", "side", "top", "bottom" and the like are used to describe various example structural parts and elements of the utility model, but these terms are used herein only for the purpose of convenience of description and are determined based on the example orientation shown in the drawings. Since the disclosed embodiments of the utility model can be arranged in different directions, these directional terms should not be considered as limiting, for example, "upper" and "lower" are not necessarily limited to the direction opposite or consistent with the direction of gravity.

[0051] Figures 1-14 A preferred embodiment of the centrifugal fan and the range hood of the utility model is shown. The range hood comprises a casing and a centrifugal fan arranged in the casing, the casing generally comprises a fan frame and a smoke collecting hood arranged at the bottom of the fan frame, the inner cavity of the fan frame is communicated with the inner cavity of the smoke collecting hood. The front side wall of the smoke collecting hood is provided with an air inlet 100, and external smoke gas can enter the smoke collecting hood through the air inlet 100. The centrifugal fan is arranged in the fan frame, and the centrifugal fan generates negative pressure when operating, and external oil fume can be sucked into the smoke collecting hood through the air inlet 100. The bottom of the smoke collecting hood is generally provided with an oil cup, 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.

[0052] 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.

[0053] Referring to Figure 4 , 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.

[0054] 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.

[0055] 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.

[0056] 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.

[0057] 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.

[0058] 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.

[0059] 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.

[0060] 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 unlocking 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 second 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 second 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.

[0061] Referring to Figure 9 , the unlocking 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 unlocking 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, i.e. without external force, the laterally protruding limiting stop part 421 of the unlocking 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, which can limit the unlocking operation part 42 from entering the movable cavity 201 through the operation port 203, so that the locking assembly is not easily unlocked by mistake 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 (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 unlocking 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.

[0062] The rotation connecting part 41 further has a lateral extending limiting baffle 43, which abuts against the side of the limiting sliding block 3 facing the operation opening 203. Specifically, in order to adapt to the rotation action of the unlocking operation piece 4, the limiting baffle 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 the curvature radius of the limiting baffle 43, so as to avoid the interference between the limiting baffle 43 and the limiting sliding block 3 to the rotation of the unlocking operation piece 4.

[0063] In the preferred embodiment, referring to Figure 10 , the main body of the locking seat 2 (i.e. 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 and connected by screws or other fasteners.

[0064] Referring to Figures 11-14 , the volute 10 includes a front side plate 101, a rear side plate 102, and a ring wall 103 connected between the front side plate 101 and the rear side plate 102, and the front side plate is provided with an air inlet 100. The volute 10 is provided with the current collector 6 at the air inlet 100 of the front side plate 101. The current collector 6 includes a ring-shaped flow guide part 61 and a connecting ring 62 extending radially outward from the flow guide part 61. The flow guide part 61 of the current collector 6 generally includes a radial flow guide part 61 with a circular arc cross section and an axial flow guide part 61 extending circumferentially from the inner side of the radial flow guide part 61. The center opening of the flow guide part 61 of the current collector 6 is further provided with a protective net 64. The connecting ring 62 of the current collector 6 is a flat annular plate structure, which can be fitted to the outer peripheral edge of the air inlet 100 of the front side plate 101 of the volute 10.

[0065] The outer peripheral edge of the connecting ring 62 of the current collector 6 of the embodiment has an outwardly extending lug part 621, and the locking knob 7 is rotatably arranged at the lug part 621. The locking knob 7 includes a knob body 70 and a limiting rib 74 arranged on the knob body 70. The knob body 70 includes a limiting disc 72, a knob operation part 71 protruding from the front side of the limiting disc 72, and a protruding column 73 extending rearward from the rear side of the limiting disc 72, wherein the knob operation part 71 is a character-shaped knob. The lug part 621 of the connecting ring 62 is provided with a first shaft hole 6210 for rotationally limiting the protruding column 73, and the outer peripheral wall of the protruding column 73 is provided with a limiting groove 730 for clamping the peripheral edge of the first shaft hole 6210.

[0066] The convex column 73 is sleeved with the limiting elastic sheet 75 at the root position adjacent to the joint with the limiting disc 72. The limiting elastic sheet 75 of the embodiment can elastically stretch and contract in the axial direction of the convex column 73, and the limiting elastic sheet 75 is abutted between the limiting disc 72 and the connecting ring 62. Under the action of the limiting elastic sheet 75, the axial gap that the peripheral edge of the first shaft hole 6210 of the connecting ring 62 can enter the annular limiting groove 1210 of the convex column 73 is effectively eliminated or compensated, and the axial shaking problem of the locking knob 7 is avoided. On the other hand, when the current collector 6 is installed on the front side plate 101 of the volute 10, the locking knob 7 is slightly pressed backward, the limiting elastic sheet 75 can be appropriately compressed, so that the limiting rib 74 can smoothly pass over the edge of the limiting hole 1011 of the volute 10 and rotate, and when the locking knob 7 is rotated to the rear, the front end of the limiting rib 74 is abutted on the rear side of the front side wall of the volute 10, the shaking problem is avoided, and the firmness of the installation of the current collector 6 is further ensured.

[0067] The limiting rib 74 protrudes radially outward from the peripheral wall of the convex column 73, and a certain gap is left between the front end of the limiting rib 74 and the limiting disc 72. In the preferred embodiment, the limiting rib 74 is a rib plate structure extending in the axial direction of the convex column 73, and the size of the limiting rib 74 protruding outward relative to the convex column 73 gradually increases from rear to front, that is, the outer edge of the limiting rib 74 forms a guide slope, so that the limiting rib 74 can conveniently pass through the limiting hole 1011 of the front side plate 101 of the volute 10 when installing.

[0068] Referring to Figure 12 The front side plate 101 of the volute 10 is provided with a limiting hole 1011 penetrating through front and rear, and the limiting rib 74 of the locking knob 7 can pass through the limiting hole 1011 backward and be limited on the rear side of the outer peripheral edge of the limiting hole 1011 of the front side plate 101 after rotating by a certain angle. Specifically, the locking knob 7 has at least a locking state in which the limiting rib 74 is limited on the rear side of the outer peripheral edge of the limiting hole 1011 to limit the limiting rib 74 from coming out of the limiting hole 1011 forward, and an unlocking state in which the limiting rib 74 is moved to a position opposite to the limiting hole 1011 to allow the limiting rib 74 to come out of the limiting hole 1011 forward, with the change of the rotating position of the locking knob 7 relative to the connecting ring 62.

[0069] Referring to Figure 13, the limiting disc 72 of the locking knob 7 has a part of the outer peripheral edge exposed outside the connecting ring 62, and the part of the outer peripheral edge of the connecting ring 62 exposed by the limiting disc 72 is provided with a limiting convex shaft 721 extending rearward. When the limiting convex shaft 721 is rotated to the position abutting against the outer peripheral edge of the connecting ring 62 (at this time, the limiting position of the locking knob 7 is the limit position of the counterclockwise rotation of the locking knob 7), the limiting rib 74 of the locking knob 7 is just opposite to the limiting hole 1011 of the front side plate of the volute 10, that is, the locking knob 7 is in the unlocking state, thereby effectively prompting that the locking knob 7 is in the unlocking state, and improving the installation efficiency of the current collector 6. Similarly, in order to effectively prompt that the locking knob 7 is in the locking state and further improve the installation efficiency of the current collector 6, the side wall surface of the front side plate towards the volute 10 is further provided with two positioning protrusions spaced along the circumference of the locking knob 7, and the limiting rib 74 is limited between the two positioning protrusions when the locking knob 7 is in the locking state. The distance between the two positioning protrusions is matched with the thickness of the limiting rib 74 of the locking knob 7, thereby effectively limiting the left and right swing of the limiting rib 74, so that the locking knob 7 can be stably kept in the locking state. The top of the positioning protrusion can be designed as a smooth convex curved surface, so that the front end of the limiting rib 74 can smoothly pass through the opposite positioning protrusion and be limited between the two positioning protrusions during the rotation of the locking knob 7. The design of the limiting protrusion 1012 can also prompt the feeling of rotation to the position during the rotation of the locking knob 7, and improve the user experience.

[0070] Referring to Figure 2 , the outer peripheral edge of the connecting ring 62 of the embodiment is provided with an outwardly extending plug 63, and the front side plate is provided with a positioning socket 1013 for inserting the plug 63. The position of the plug 63 connected with the connecting ring 62 is inclined rearward to form a limiting step 631. After the plug 63 of the current collector 6 is installed in place, the limiting step 631 allows the current collector 6 to be deflected rearward around the plug 63, so that the connecting ring 62 of the current collector 6 is better attached to the outer side plate of the volute 10. In order to further ensure the firmness of the installation of the current collector 6, the plug 63 of the current collector 6 of the embodiment has two, and the two plugs 63 are located at the bottom of the connecting ring 62 and extend downward. The plug 63 is arranged at the bottom of the current collector 6, which is more in line with the operation habit of the operator to install downward, and facilitates the operator to insert the plug 63 into the positioning socket 1013 of the front side plate of the volute 10.

[0071] The current embodiment of the current collector 6 is connected with the front side plate 101 of the volute 10 by the locking knob 7. When the current collector 6 needs to be installed on the front side plate 101 of the volute 10, only the limiting rib 74 of the locking knob 7 needs to be rotated by a certain angle after passing through the limiting hole 1011 on the front side plate 101 of the volute 10, and the limiting rib 74 can be limited on the rear side of the peripheral edge of the limiting hole 1011 and cannot be pulled out of the limiting hole 1011 forwardly to be in a locked state. When the current collector 6 needs to be disassembled, the locking knob 7 is rotated to the position where the limiting rib 74 is opposite to the limiting hole 1011, so that the limiting rib 74 can be pulled out of the limiting hole 1011 forwardly to be unlocked. The locking and unlocking by the locking knob 7 is more convenient for the operator to operate, the disassembly process is more labor-saving, and the loosening or disengagement problem caused by the movement and vibration of the fan is less likely to occur, thereby ensuring the reliability of the connection between the current collector 6 and the front side plate 101 of the volute 10.

[0072] Referring to Figure 2 and Figure 3 , the opening defined by the flow guide part 61 of the current collector 6 is provided with a protective net 64. In order to increase the effective air inlet area as much as possible, the protective net 64 is an arc-shaped net with the middle part protruding forwardly. The protective net 64 can be fixedly connected with the current collector 6 as an integral piece.

[0073] The front side of the locking seat 2, i.e., the front wall surface of the cover 22 of the locking seat 2, is further provided with a flexible extension piece 8 extending forwardly. The "flexible extension piece 8" can be understood as that the extension piece 8 can be bent and deformed under external force and restored to the initial state after the external force is removed. The extension piece 8 can be a plastic piece, a metal piece, etc. In detail, the extension piece 8 can be in a strip-shaped or sheet-shaped structure. In order to facilitate the installation on the front side of the locking seat 2, the extension piece 8 is a plastic card. The plastic card is in an L-shaped structure as a whole, and the horizontal part is fixed on the front wall surface of the cover 22 by a screw, and the vertical part extends toward the protective net 64.

[0074] When the impeller 11 and the locking assembly are normally installed in place, the extension piece 8 has a certain distance from the protective net 64 at the air inlet 100 of the volute 10, and the extension piece 8 will not rub against the protective net 64 to make a sound when the impeller 11 rotates. When the impeller 11 and the locking assembly are not installed in place, the extension piece 8 will contact the protective net 64, and will make a rustling rubbing sound when running, thereby reminding the user to reinstall.

[0075] The extension pieces 8 of the embodiment can be provided at least two, and each extension piece 8 is arranged in sequence along a circumference with the axis of the output shaft 121 of the motor 12 as a center line, that is, the setting positions of the two extension pieces 8 on the front side of the locking seat 2 are both eccentric to the axis of the output shaft 121 of the motor 12, so that when the motor 12 drives the impeller 11 to rotate, the extension piece 8 has a larger moving distance relative to the protective net 64, thereby emitting a more obvious sound, facilitating the operator to identify.

Claims

1. A centrifugal fan for a range hood, comprising: a volute (10) having an air inlet (100); 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 the impeller (11), the wheel plate (1111) being connected to 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), a limiting slide block (3) movably arranged in the movable chamber (201), the limiting slide 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 slide 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 slide block (3) and making the limiting slide 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 air inlet (100) of the volute (10) is further provided with a protective net (64), and the front side of the locking seat (2) is further provided with a flexible extension member (8) extending forward, in the installed state of the impeller (11), the extension member (8) is not in contact with the protective net (64), and in the non-installed state of the impeller (11), the extension member (8) is in contact with the protective net (64). The extension member (8) is a plastic member capable of being bent and deformed under external force and returning to the initial state after the external force is removed. The extension member (8) is a plastic card. The extension member (8) is connected to the front side of the locking seat (2) through a fastener. The extension member (8) is arranged eccentrically relative to the axis of the output shaft (121) of the motor (12) at the arrangement position of the front side of the locking seat (2). There are at least two extension members (8), and each extension member (8) is arranged in sequence along the circumference with the axis of the output shaft (121) of the motor (12) as the center line. The protective net (64) is an arc-shaped net with the middle part protruding forward. The limiting slide block (3) is movably arranged in the movable chamber (201) in the transverse direction, in the locking state, the locking portion (32) of the limiting slide 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 slide 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). ​ 2. The centrifugal fan for a range hood according to claim 1, characterized by: ​ 3. The centrifugal fan for a range hood according to claim 2, characterized by: ​ 4. The centrifugal fan for a range hood according to claim 1, characterized by: ​ 5. The centrifugal fan for a range hood according to claim 1, characterized in that: ​ 6. The centrifugal fan for a range hood according to claim 5, characterized in that: ​ 7. The centrifugal fan according to claim 1, characterized in that: ​ 8. The centrifugal fan according to any one of claims 1 to 7, characterized in that: ​ 9. The centrifugal fan for a range hood according to claim 8, characterized in that: An operation port (203) is further formed in the locking seat (2) from the outer wall surface to the movable cavity (201); The locking assembly further comprises: An unlocking operation member (4) is rotatably arranged on the limiting sliding block (3) and can be switched between a first position and a second position, 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 unlocking operation part (42) extending outward from the rotating connecting part (41) through the operation port (203), the unlocking operation part (42) further comprises a laterally protruding limiting stop part (421), when the unlocking operation member (4) is located at the first position, the limiting stop part (421) is limited at the outer peripheral edge of the operation port (203) to limit the unlocking operation part (42) from entering the movable cavity (201) through the operation port (203), when the unlocking operation member (4) is located at the second position, the limiting stop part (421) is moved to a position opposite to the operation port (203) to allow the unlocking operation part (42) to enter the movable cavity (201) through the operation port (203) under the pressing of external force, and then the unlocking operation member (4) is pressed to the limiting sliding block (3) to be unlocked; A second elastic member (52) acts on the unlocking operation member (4) and makes the unlocking operation member (4) always have a tendency to move from the second position to the first position.

10. The centrifugal fan for a range hood according to any one of claims 1 to 7, characterized by: The inlet (100) of the volute (10) is provided with a flow collector (6), and the protective net (64) is arranged on the flow collector (6).

11. The centrifugal fan for a range hood according to claim 10, characterized in that: The flow collector (6) comprises a ring-shaped flow guide part (61) and a connecting ring (62) extending radially outward from the flow guide part (61), the connecting ring (62) is further provided with a locking knob (7), the locking knob (7) comprises a knob main body (70) rotatably arranged on the connecting ring (62) and a limiting rib (74) arranged on the knob main body (70), a front-to-back through limiting hole (1011) is formed in the front side plate (101) of the volute (10) and used for allowing the limiting rib (74) to pass through, the locking knob (7) has at least a locking state in which the limiting rib (74) is limited at the rear side of the outer peripheral edge of the limiting hole (1011) to prevent the limiting rib (74) from being pulled out of the limiting hole (1011) and an unlocking state in which the limiting rib (74) is moved to a position opposite to the limiting hole (1011) to allow the limiting rib (74) to be pulled out of the limiting hole (1011).

12. A range hood comprising a fan system, characterized by: The fan system adopts the centrifugal fan of any one of claims 1-11.

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