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

Abstract

The application relates to a centrifugal fan impeller mounting structure, a centrifugal fan and an extractor hood. The impeller quick-release structure comprises a locking assembly, the locking assembly comprises a knob part, the knob part is internally defined with a locking chamber, and a mounting slot is formed in the side wall facing the wheel disc to enable an output shaft and a pin shaft thereof to extend into the locking chamber; the locking chamber is internally provided with a limiting structure capable of locking and unlocking the output shaft and the pin shaft thereof, the limiting structure is configured as follows: in the state that the output shaft and the pin shaft thereof extend into the locking chamber from the mounting slot, the limiting structure limits the pin shaft in the axial direction of the output shaft to limit the output shaft and the pin shaft from exiting from the mounting slot; after the knob part is rotated at a set angle with the output shaft as the rotation axis, the limiting structure releases the limitation on the pin shaft in the axial direction and further allows the pin shaft to exit from the mounting slot. The advantages are as follows: quick locking and unlocking can be realized, the mounting is convenient, special tools are not needed, and the structure is suitable for frequent operation.

Description

Technical Field

[0001] This invention relates to the field of centrifugal fan technology, and in particular to an impeller mounting structure for a centrifugal fan, a centrifugal fan, and a range hood. Background Technology

[0002] Centrifugal fans are the core component of range hoods, with the impeller being a key part of the fan system. When oil accumulates on the impeller blades due to grease contamination, the oil alters the blade's streamline and increases its weight. This leads to a decline in the overall performance of the fan system. When the accumulated oil reaches a certain level, the overall performance of the range hood severely deteriorates, noise increases, airflow is significantly reduced, and smoke escape occurs, seriously affecting the user experience. Therefore, after a period of use, users need to perform a major maintenance on the range hood. However, maintenance often requires technical expertise and specialized cleaning services, which are costly. Consequently, the development trend of range hoods is gradually moving towards easier disassembly and assembly. Currently, the impeller is fixed using a left-hand twisted nut, requiring specialized tools for disassembly and assembly. The pre-tightening force is also relatively large, making it difficult to open manually. The numerous rotations also make installation and disassembly inconvenient and unsuitable for frequent operation. Furthermore, insufficient pre-tightening by the user can lead to loosening and safety risks. For example, Chinese utility model patent application CN01239583.8 discloses such a centrifugal fan impeller installation structure. With the promotion of easy-to-disassemble and clean range hoods, the frequency of disassembly and cleaning is gradually increasing, and frequent operation is becoming more inconvenient. Therefore, there is an urgent need to propose an impeller installation structure design for centrifugal fans that is easy to disassemble and assemble. Summary of the Invention

[0003] The first technical problem to be solved by the present invention is to provide an impeller mounting structure for a centrifugal fan that is easy to disassemble and assemble, in light of the current state of the prior art.

[0004] The second technical problem to be solved by the present invention is to provide a centrifugal fan that applies the above-mentioned quick-release impeller structure, in view of the current state of the prior art.

[0005] The second technical problem to be solved by the present invention is to provide a range hood that uses the above-mentioned centrifugal fan, in view of the current state of the prior art.

[0006] The technical solution adopted by the present invention to solve the first technical problem mentioned above is: an impeller mounting structure for a centrifugal fan, the centrifugal fan including a motor and an impeller assembly, the motor having an output shaft, the outer peripheral wall of the output shaft having a radially outwardly extending pin, the impeller assembly including an impeller and a wheel disk connected to the impeller, the wheel disk being connected to the output shaft of the motor;

[0007] The impeller quick-release structure includes:

[0008] A locking assembly, connected to the output shaft of the motor and located on the side of the wheel away from the motor body, is used to limit the wheel axially on the output shaft;

[0009] The locking assembly includes a knob that defines a locking chamber and has a mounting slot on its side wall facing the wheel for the output shaft and its pin to extend into the locking chamber. The locking chamber also has a limiting structure for locking and unlocking the output shaft and its pin. This limiting structure is configured such that: when the output shaft and its pin are inserted into the locking chamber from the mounting slot, the limiting structure limits the pin axially to prevent it from exiting the mounting slot; after the knob rotates a set angle about the output shaft, the limiting structure releases the axial restriction on the pin, allowing it to exit the mounting slot.

[0010] To ensure the stability of locking and unlocking of the locking assembly, as an improvement, the locking assembly further includes:

[0011] A rotary limiting member is rotatably constrained in the locking chamber with the output shaft of the motor as the rotation axis. The rotary limiting member has a sliding groove for the output shaft and its pin to enter the locking chamber and an exit groove for the output shaft and its pin to exit the locking chamber along its rotation direction. The side wall of the sliding groove of the rotary limiting member is also provided with a telescopic locking head that allows the pin to enter the locking chamber through the sliding groove and restricts its exit from the sliding groove after the pin enters the locking chamber. The rotary limiting member has at least a locked state in which its sliding groove is aligned with the mounting slot of the knob and an unlocked state in which its exit groove is aligned with the mounting slot of the knob as its rotation position changes.

[0012] The first elastic element acts on the rotation limiting element and makes the rotation limiting element always have a tendency to rotate from the position of the unlocked state to the position of the locked state.

[0013] The locking chamber of the knob is further provided with a guide groove on the inner wall opposite to the rotary limiting member. The guide groove extends in the circumferential direction and connects the sliding groove and the exit groove of the rotary limiting member. When the knob is pressed down by an external force along the extension direction of the output shaft, the pin of the output shaft can enter the guide groove from the sliding groove and rotate along the guide groove to a set position to release the pressed state and then enter the exit groove. When the pin of the output shaft enters the exit groove, it can drive the rotary limiting member to rotate from the locked position to the unlocked position.

[0014] The aforementioned rotating limiting member, telescopic locking head, and first elastic member together constitute the limiting structure.

[0015] To facilitate accurate rotation of the knob to the set angle position, the guide groove of the knob is connected at its two ends in the extending direction to the sliding groove and the exit groove of the rotation limiting member, respectively. This structural design allows the user to directly rotate the knob clockwise or counterclockwise to the limit angle position to ensure proper rotation.

[0016] To ensure a secure lock on the output shaft, the pin on the output shaft has two symmetrically arranged sections about the axis of the output shaft, and the guide groove on the knob also has two corresponding sections.

[0017] Since the knob has a certain axial displacement relative to the output shaft during the locking and unlocking process, in order to adapt to this and ensure the stability of the locking and unlocking process, a clearance channel is provided on the inner wall of the knob facing the rotation limiter in the area opposite to the end of the output shaft, so that the end of the output shaft can extend into it.

[0018] In order to achieve the installation and positioning of the rotary limiting component in the locking chamber of the knob component, the rotary limiting component is a plate-shaped structure with an overall circular shape. The outer periphery of the rotary limiting component has a protrusion extending radially outward. The locking chamber has a corresponding positioning groove on the side wall opposite to the outer periphery of the rotary limiting component, which extends in the circumferential direction and allows the protrusion to slide and limit in the circumferential direction.

[0019] The aforementioned elastic element can be made using various existing technologies, including compression springs, torsion springs, leaf springs, and other elastic elements. However, in order to better cooperate with the aforementioned rotation limiting element, the positioning groove is generally arc-shaped, and the first elastic element is a compression spring, which is arranged in the positioning groove and abuts against the protrusion of the rotation limiting element.

[0020] To facilitate the installation of components such as the rotation limiter and the first elastic element, the knob includes a knob body and a pressure plate. The knob body has a protrusion on the side wall facing the wheel, which protrudes towards the wheel. The protrusion is hollow inside and forms an installation opening on the side facing the wheel. The pressure plate covers the installation opening and, together with the protrusion, defines the locking chamber.

[0021] To improve the strength of the knob, the boss is located in the middle of the side wall of the knob body facing the wheel, and the side wall of the knob body facing the wheel is also provided with reinforcing ribs arranged circumferentially and connected to the outer peripheral wall of the boss.

[0022] To achieve the purpose of locking by pressing and unlocking by rotating, and to prevent the knob from easily detaching from the output shaft, the locking assembly further includes:

[0023] An axial limiting member is provided on the side of the knob facing the wheel in a manner that allows it to move axially along the motor shaft, and abuts against the wheel in the axial direction of the output shaft. The axial limiting member has a clearance opening at a position opposite to the mounting slot.

[0024] The second elastic element acts between the axial limiting element and the knob element, and causes the knob element to always tend to move away from the axial limiting element along the axial direction of the output shaft.

[0025] As an improvement, the knob has a receiving chamber open on one side facing the wheel, and the axial limiting member is movably disposed in the receiving chamber.

[0026] The aforementioned second elastic element can employ various existing technologies, including various elastic elements such as compression springs, torsion springs, and leaf springs. However, in order to better cooperate with the aforementioned axial limiting element, the axial limiting element is a plate structure perpendicular to the output shaft. The axial limiting element is connected to the knob element through a connecting shaft. The second elastic element is a compression spring sleeved on the connecting shaft and abutting between the axial limiting element and the knob element.

[0027] To ensure the stability of the axial movement of the axial limiting member within the receiving cavity of the knob, the outer peripheral edge of the axial limiting member slides in contact with the inner wall of the receiving cavity of the knob.

[0028] As an improvement, the outer peripheral edge of the axial limiting member also has a flange extending toward the interior of the receiving cavity, the flange slidingly contacting the inner sidewall of the receiving cavity of the knob member.

[0029] In order to install the telescopic clamp onto the rotating limiting member, the rotating limiting member is also provided with a mounting groove that communicates with the sliding groove. The telescopic clamp is movably disposed in the mounting groove and has an extended state that extends from the mounting groove into the sliding groove and a retracted state that retracts from the sliding groove into the mounting groove.

[0030] The telescopic movement of the telescopic chuck can be adjusted by the corresponding operating component. However, in order to simplify the structure and achieve the purpose of automatically extending and locking the telescopic chuck after the pin enters the sliding groove, a third elastic element is also included, which acts on the telescopic chuck. Under the action of the third elastic element, the telescopic chuck always tends to move toward the sliding groove.

[0031] The aforementioned elastic element can be made using various existing technologies, including compression springs, torsion springs, leaf springs, and other elastic elements. However, in order to better cooperate with the telescopic clip, the third elastic element is a compression spring located in the mounting groove. The first end of the compression spring abuts against the telescopic clip, and the other end abuts against the inner wall of the mounting groove.

[0032] To facilitate the insertion of the pin into the sliding groove when the knob is pressed, the side wall of the output shaft pin, which faces the wheel, has a guide slope that allows the pin to apply pressure to the mounting groove as it enters the sliding groove.

[0033] To facilitate user gripping and turning of the knob, the outer peripheral wall of the knob also has anti-slip recesses arranged sequentially along its circumference and all recessed inward.

[0034] The technical solution adopted by the present invention to solve the second technical problem mentioned above is as follows: a centrifugal fan, including a volute, an impeller assembly and a motor, wherein the main body of the motor is connected to the volute, the impeller assembly is disposed inside the volute and connected to the output shaft of the motor, characterized in that: the output shaft of the motor and the impeller assembly are connected by the impeller mounting structure of the centrifugal fan mentioned above.

[0035] The technical solution adopted by the present invention to solve the third technical problem mentioned above is: a range hood, including a fan system, wherein the fan system adopts the centrifugal fan mentioned above.

[0036] Compared with the prior art, the advantages of this invention are as follows: When the motor's output shaft and its pin extend from the mounting slot into the locking chamber of the knob, the knob's limiting structure limits the pin axially to prevent the output shaft and its pin from exiting the mounting slot; however, after the knob rotates a set angle around the output shaft, the limiting structure releases the axial restriction on the pin, allowing it to exit the mounting slot. This mounting structure enables quick locking and unlocking, is easy to install, requires no special tools, and is suitable for frequent operation; furthermore, while quickly unlocking, it has a reliable anti-loosening function, preventing loosening or detachment without external intervention, ensuring safety and reliability. Attached Figure Description

[0037] Figure 1 This is a three-dimensional structural diagram of the locking assembly according to an embodiment of the present invention;

[0038] Figure 2 This is a cross-sectional view of the locking assembly according to an embodiment of the present invention;

[0039] Figure 3 This is an exploded view of the locking assembly according to an embodiment of the present invention;

[0040] Figure 4for Figure 1 A schematic diagram of the three-dimensional structure after omitting the axial limiting component;

[0041] Figure 5 for Figure 4 A schematic diagram of the three-dimensional structure without the pressure plate;

[0042] Figure 6 for Figure 5 A schematic diagram of the structure of the rotating limiting member rotating to the unlocked state (the first elastic member is compressed and not shown);

[0043] Figure 7 for Figure 5 A three-dimensional structural diagram after omitting components such as the rotation limiter and the first elastic element;

[0044] Figure 8 This is a cross-sectional view of the locking assembly after it is connected to the output shaft of the motor according to an embodiment of the present invention;

[0045] Figure 9 This is a three-dimensional structural diagram of the rotating limiting member (with a telescopic locking head) according to an embodiment of the present invention;

[0046] Figure 10 This is a cross-sectional view of a centrifugal fan according to an embodiment of the present invention;

[0047] Figure 11 This is a cross-sectional view of the locking assembly of the centrifugal fan in the separated state according to an embodiment of the present invention;

[0048] Figure 12 This is a cross-sectional view of a centrifugal fan according to an embodiment of the present invention. Detailed Implementation

[0049] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0050] The specification and claims of this invention use terms indicating direction, such as "front," "rear," "upper," "lower," "left," "right," "side," "top," and "bottom," to describe various exemplary structural parts and elements of the invention. However, these terms are used herein merely for ease of explanation and are determined based on the exemplary orientations shown in the accompanying drawings. Since the embodiments disclosed in this invention can be arranged in different orientations, these terms indicating direction are for illustrative purposes only and should not be considered as limitations. For example, "upper" and "lower" are not necessarily limited to directions opposite to or consistent with the direction of gravity.

[0051] Figures 1-12A preferred embodiment of the present invention is shown, an impeller mounting structure for a centrifugal fan, including a locking assembly disposed at the end of the output shaft 11 of a motor 10, for limiting the impeller assembly 21 of the impeller assembly 2 in the axial direction of the output shaft 11.

[0052] In this embodiment, the output shaft 11 of the motor 10 can be understood as either the output shaft of the motor 10 itself, or as an "extended shaft" after the output shaft of the motor 10 is connected to a separate component (such as the connecting shaft 63 in the following text) via a threaded connection or other connection method. Figure 8 As shown, the end of the output shaft of motor 10 is connected to a connecting shaft 63. Specifically, the output shaft of motor 10 and the connecting shaft 63 are connected by a left-hand thread, extending the output shaft of motor 10. The purpose of this design is to add a component to the existing fan system to achieve a quick-locking solution, avoiding design modifications to the output shaft and impeller of motor 10, reducing costs, and achieving short-cycle development. The other end of the connecting shaft 63 is provided with a pin hole (not shown in the figure; pin 12 and connecting shaft 63 are drawn as a single unit). The pin hole is used to install pin 12. The extension direction of pin 12 is perpendicular to the extension direction of output shaft 11. It is conceivable that, in addition to achieving this function through connecting shaft 63, the output shaft of motor 10 can also be modified by extending the output shaft and adding a pin hole at the end of the output shaft, making the parts a single unit. The pin 12 is installed in the pin hole and is connected and fixed to the pin hole of the connecting shaft 63 by interference fit. The length of the pin 12 is smaller than the diameter of the impeller mounting hole, that is, smaller than the diameter of the impeller mating section of the output shaft of the motor 10, so as to ensure that the impeller can be quickly installed and removed after the connecting shaft 63 and the pin 12 are installed.

[0053] In this embodiment, the locking assembly is connected to the output shaft 11 of the motor 10 and is located on the side of the wheel 21 away from the main body of the motor 10, for limiting the wheel 21 axially on the output shaft 11. Figure 9 As shown, after the output shaft 11 of the motor 10 passes through the shaft hole of the impeller 21, the rear side of the impeller 21 abuts against a limiting rod extending radially on the output shaft 11 of the motor 10 (which can achieve circumferential limiting), and the front side of the impeller 21 abuts against the locking assembly connected to the output shaft 11, thereby achieving the limiting of the impeller 21 in both the front and rear directions of the output shaft 11.

[0054] See Figures 1-7 The locking assembly includes a knob 3, a rotation limiter 4, an axial limiter 6, a first elastic element 71, a second elastic element 72, a third elastic element 73, and a telescopic locking head 5.

[0055] The knob component 3 includes a knob body 31 and a pressure plate 32 connected to the knob body 31. The knob body 31 is generally a pressure cap structure with an opening facing the wheel 21, and includes a bottom wall 31a and an annular side wall 31b extending from the outer periphery of the bottom wall 31a to one side. The bottom wall 31a and the side wall 31b of the knob body 31 together define a receiving chamber 36 with an opening on one side of the wheel 21.

[0056] The inner central region of the bottom wall 31a of the knob body 31 has a boss 33 protruding towards the wheel 21. The boss 33 is hollow and forms a mounting opening 330 on the side facing the wheel 21. The inner side of the bottom wall 31a of the knob body 31 also has reinforcing ribs 35 arranged sequentially along the circumference of the boss 33 (three reinforcing ribs are shown in this embodiment). The inner end of each reinforcing rib 35 connects to the outer peripheral wall of the boss 33, and the outer end connects to the side wall 31b of the knob body 31, thereby ensuring the strength of the knob 3 and facilitating its fixation to the pressure plate 32. Specifically, the pressure plate 32 covers the mounting opening 330 and, together with the boss 33, defines a locking chamber 34. Figure 4 As shown, the height of the reinforcing rib 35 in this embodiment is basically the same as the height of the boss 33, and the pressure plate 32 is connected to the three reinforcing ribs 35 by three screws respectively.

[0057] The axial limiting member 6 is a plate-shaped structure perpendicular to the output shaft 11 of the motor 10, and it is disposed in the receiving chamber 36 of the knob 3. Specifically, the shape of the axial limiting member 6 is basically consistent with the cross-sectional shape of the receiving chamber 36, and the outer peripheral edge of the axial limiting member 6 slides in contact with the inner sidewall of the receiving chamber 36 of the knob 3. More specifically, in order to extend the axial movement stroke of the circumferential limiting member, the outer peripheral edge of the axial limiting member 6 also has a flange 62 extending toward the interior of the receiving chamber 36, and the flange 62 slides in contact with the inner sidewall of the receiving chamber 36 of the knob 3.

[0058] In this embodiment, the axial limiting member 6 is connected to the knob body 31 via three connecting shafts 63. Specifically, the three connecting shafts 63 are respectively connected to the three reinforcing ribs 35 of the knob body 31, and the axial limiting member 6 is axially constrained thereon. These three connecting shafts 63 also act as guide shafts, allowing the axial limiting member 6 to have a movable stroke in the axial direction. In this embodiment, there are three second elastic members 72, specifically three compression springs sleeved on the connecting shafts 63 and abutting between the axial limiting member 6 and the knob body 31. Under the action of these compression springs, the knob 3 always tends to move away from the axial limiting member 6 along the axial direction of the output shaft 11. In this embodiment, the axial limiting member 6 also has a clearance opening 61 in the middle, through which the output shaft 11 of the motor 10 and the pin 12 extend into the receiving chamber 36. During or after the locking assembly is installed, the axial limiting member 6 and the wheel 21 are always abutting each other in the axial direction of the output shaft 11, and the second elastic member 72 is in a compressed state.

[0059] The aforementioned connecting shaft 63 can be a stepped screw with a smooth shaft section, which is used to guide the movement of the axial limiting member 6. The second elastic member 72 needs to generate a certain preload in the installed state. This preload is the preload that presses against the impeller. At the same time, the second elastic member 72 also needs to be further compressed to achieve locking. Therefore, ensuring that the elastic force at the maximum compression meets the conventional manual pressing force can be achieved by designing and selecting parameters such as the free length and stiffness of the spring.

[0060] The axial limiting member 6 in this embodiment can achieve a pre-tightening function, providing an axial pre-tightening force to prevent impeller movement. It also serves to seal the second elastic member 72 and the internal structure, making the locking assembly a single unit and preventing internal contamination. The axial limiting member 6 is connected to the knob via a stepped screw. The axial limiting member 6 can be displaced within the knob body 31 to allow the pin 12 to slide within the locking chamber. The clearance opening 61 in the middle of the axial limiting member 6 allows for pre-guidance between the locking assembly and the output shaft 11 of the motor 10.

[0061] In this embodiment, the pressure plate 32 is provided with a mounting slot 320 for the output shaft 11 and its pin 12 to extend into the locking chamber 34. The mounting slot 320 is axially opposite to the clearance opening 61 on the axial limiting member 6. In order to be compatible with the output shaft 11 and pin 12 of the motor 10, the mounting slot 320 is a radially extending strip-shaped opening.

[0062] The locking chamber 34 of the knob 3 is also provided with a limiting structure that can lock and unlock the output shaft 11 and its pin 12. The limiting structure is configured such that: when the output shaft 11 and its pin 12 extend from the mounting slot 320 into the locking chamber 34, the limiting structure limits the pin 12 in the axial direction of the output shaft 11 to prevent the output shaft 11 and its pin 12 from exiting the mounting slot 320; after the knob 3 rotates a set angle with the output shaft 11 as the axis of rotation, the limiting structure releases the axial restriction on the pin 12 and allows it to exit the mounting slot 320.

[0063] Specifically, the rotation limiting member 4, the telescopic locking head 5, and the first elastic member 71 in this embodiment together constitute the above-mentioned limiting structure.

[0064] The rotation limiting member 4 is also a plate-shaped structure that is basically perpendicular to the output shaft 11. The rotation limiting member 4 and the first elastic member 71 are both located in the locking chamber of the knob body 31. The rotation limiting member 4 is rotatably constrained in the locking chamber 34 with the output shaft 11 of the motor 10 as the axis of rotation. The rotation limiting member 4 has a sliding groove 41 for the output shaft 11 and its pin 12 to enter the locking chamber 34 and an exit groove 42 for the output shaft 11 and its pin 12 to exit the locking chamber 34 along its rotation direction. In this embodiment, the sliding groove 41 and the exit groove 42 are also strip-shaped grooves that extend radially. Specifically, the sliding groove 41 and the exit groove 42 are basically perpendicular to each other and communicate with each other in the middle.

[0065] The rotating limiting member 4 is also provided with a telescopic locking head 5 that allows the pin 12 to enter the locking chamber 34 via the sliding groove 41 and restricts its exit from the sliding groove 41 after the pin 12 enters the locking chamber 34. To install the telescopic locking head 5 onto the rotating limiting member 4, the rotating limiting member 4 in this embodiment is also provided with a placement groove 44 that communicates with the sliding groove 41, the extension direction of the placement groove 44 being substantially perpendicular to the extension direction of the sliding groove 41. The telescopic locking head 5 is movably constrained in the placement groove 44 and has an extended state extending from the placement groove into the sliding groove 41 and a retracted state retracting from the sliding groove 41 into the placement groove 44. The third elastic element 73 is provided in the mounting groove 44 of the rotation limiting element 4. Specifically, the third elastic element 73 is a compression spring provided in the mounting groove 44. The first end of the compression spring abuts against the telescopic head 5, and the other end abuts against the inner wall of the mounting groove 44, thereby making the telescopic head 5 always tend to move towards the sliding groove 41 under the action of the third elastic element 73.

[0066] See Figure 9In this embodiment, the telescopic clamp 5 has a guide slope 51 on the side wall facing the wheel 21, which allows the pin 12 to apply pressure to the telescopic clamp 5 towards the mounting groove 44 during the process of entering the sliding groove 41. It can be understood that the side wall of the telescopic clamp 5 facing away from the wheel 21 is set as a plane, thereby preventing the pin 12 from coming out of the sliding groove 41 after passing through it.

[0067] The locking chamber 34 of the knob 3 also has a guide groove 310 on its inner wall opposite to the rotation limiting member 4. This guide groove extends circumferentially and connects to the sliding groove 41 and the exit groove 42 of the rotation limiting member 4. The two ends of the guide groove 310 in its extension direction are respectively connected to the sliding groove 41 and the exit groove 42 of the rotation limiting member 4. That is, the central angle corresponding to the extension length of the guide groove 310 of the knob 3 is approximately 90°. When unlocking, the user can directly rotate the knob 3 clockwise or counterclockwise to the limit angle position to ensure that the knob 3 is accurately rotated to the set angle position (that is, the position opposite to the sliding groove 41 or the exit groove 42).

[0068] Since the pin 12 on the output shaft 11 of the motor 10 in this embodiment has two segments symmetrically arranged about the axis of the output shaft 11, the guide groove 310 on the knob 3 also has two corresponding segments.

[0069] In this embodiment, the locking chamber of the knob 3 has a clearance channel 311 on the inner wall facing the rotation limiting member 4, in a region opposite to the end of the output shaft 11, into which the end of the output shaft 11 extends. The diameter of the clearance channel 311 is substantially the same as the outer diameter of the end of the output shaft 11. When the motor 10 is locked by the locking assembly with the pin 12, the end of the output shaft 11 also extends into the aforementioned upper channel, thereby ensuring the stability of the locking and unlocking process.

[0070] The overall outline of the rotating limiting member 4 is circular. The outer periphery of the rotating limiting member 4 has a radially outwardly extending protrusion 43. A positioning groove 38 extending circumferentially is correspondingly provided on the side wall of the locking chamber opposite to the outer periphery of the rotating limiting member 4. The positioning groove 38 is generally arc-shaped, and in this embodiment, the central angle corresponding to the extension length of the positioning groove 38 is approximately 90°. The protrusion 43 of the rotating limiting member 4 is located in the aforementioned positioning groove 38 and moves along the positioning groove 38 during the rotation of the rotating limiting member 4.

[0071] The rotation limiting member 4, as its rotational position changes, has at least a locked state where its sliding groove 41 aligns with the mounting slot 320 of the pressure plate 32, and an unlocked state where its exit groove 42 aligns with the mounting slot 320 of the knob 3. In this embodiment, the first elastic member 71 is also a compression spring, which is arranged in the positioning groove 38 and abuts against the protrusion 43 of the rotation limiting member 4, causing the rotation limiting member 4 to always have a tendency to rotate from the unlocked position to the locked position. Under no external force, the protrusion 43 of the rotation limiting member 4 abuts against the end wall of the positioning groove 38, and the sliding groove 41 of the rotation limiting member 4 aligns with the mounting slot 320 of the pressure plate 32. When the pin 12 of the motor 10 is in the locked state, the pin 12 abuts against the back of the telescopic chuck 5 axially. At this time, the pin 12 simultaneously abuts against the side wall of the sliding groove 41 of the rotation limiting member 4 and the side wall of the guide groove 310 of the knob body 31 laterally. When the knob 3 is pressed down by an external force along the extension direction of the output shaft 11, the pin 12 of the output shaft 11 can enter the guide groove 310 from the sliding groove 41 and rotate along the guide groove 310 to the set position to release the state of being pressed down by the external force and then enter the exit groove 42. When the pin 12 of the output shaft 11 enters the exit groove 42, the pin 12 is only circumferentially opposite to the side wall of the exit groove 42 of the rotation limit member 4 (that is, it is axially offset from the side wall of the guide groove 310 of the knob body 31). When the knob 3 is rotated, the rotation limit member 4 rotates relative to the knob 3, specifically from the locked position of the rotation limit member 4 to the unlocked position.

[0072] To facilitate user grip and operation and prevent slippage, the outer peripheral wall of the knob body 31 also has anti-slip recesses 37 arranged sequentially along its circumference and all recessed inward.

[0073] The working process of the impeller mounting structure in this embodiment:

[0074] First, install the connecting shaft 63 and the pin 12 as a whole at the front end of the output shaft of the motor 10, or modify them to be integrated with the output shaft of the motor 10. Align the clearance opening 61 of the knob 3 with the output shaft of the motor 10 and insert it. Lightly press the knob 3 and rotate the knob to align the pin 12 with the mounting slot 320 on the pressure plate 32. Then press it down firmly. The pin 12 acts on the guide slope of the telescopic clamp 5, pushing the telescopic clamp 5 back. The pin 12 enters the sliding groove 41 of the rotation limiter 4, and the telescopic clamp 5 resets, blocking the pin 12 and preventing it from coming out of the sliding groove 41. The installation is now complete. In this state (under the elastic force of the second elastic element 72), the pin 12 abuts against the back of the telescopic locking head 5 in the axial direction. At the same time, the pin 12 is locked between the sliding groove 41 of the rotation limiting element 4 and the side wall of the guide groove 310 of the knob body 31. That is, the pin 12 abuts against both the side wall of the sliding groove 41 of the rotation limiting element 4 and the side wall of the guide groove 310 of the knob body 31 in the lateral direction. When the impeller starts and accelerates (clockwise rotation), the pin 12 acts on the side wall of the guide groove 310 of the knob body 31 and will not loosen. Because the starting acceleration is greater, it needs to be locked against the wall of the knob 3, which has higher structural strength. When the impeller decelerates, the knob 3, due to inertia, will cause the pin 12 to lock onto the other side wall of the sliding groove 41 of the rotation limiter 4. Since the protrusion 43 of the rotation limiter 4 abuts against the end wall of the positioning groove 38 of the knob body 31 in this rotational direction, the rotation limiter 4 transmits force to the knob body 31 through the limit, ensuring the reliability of the locked state. On the other hand, the end face of the axial limiter 6 contacts the end face of the impeller disk 21, and axial force is applied through the second elastic member 72, preventing axial displacement.

[0075] When unlocking, the user presses down on the knob 3, causing the pin 12 to slide out of the sliding groove 41 of the rotation limiter 4 and contact the bottom of the guide groove 310 of the knob body 31. After rotating 90 degrees clockwise and reaching the desired position, slightly release the knob 3. This will lock the pin 12 into the exit groove 42 of the rotation limiter 4 (at this point, the pin 12 is axially abutting against the pressure plate 32). Then, rotate 90 degrees counterclockwise. The rotation limiter 4 can compress the first elastic element 71. During rotation, when the exit groove 42 aligns with the mounting slot 320 of the pressure plate 32, the quick-locking assembly can be removed. To indicate the direction, the unlocking and locking directions can be marked on the surface of the knob 3.

[0076] See Figures 10-12 This embodiment also relates to a centrifugal fan, including a volute 80, an impeller assembly 2, and a motor 10. The main body of the motor 10 is connected to the volute 80. The impeller assembly 2 is disposed inside the volute 80 and includes a central disk 20 connected to a wheel disk 21. The output shaft 11 of the motor 10 is connected to the wheel disk 21 of the impeller assembly 2 using the aforementioned mounting structure of the centrifugal fan impeller assembly 2.

[0077] This embodiment also relates to a range hood, which includes a body (not shown) and a fan system disposed within the body, wherein the fan system adopts the centrifugal fan described above.

Claims

1. An impeller mounting structure for a centrifugal fan, the centrifugal fan including a motor (10) and an impeller assembly (2), the motor (10) having an output shaft (11) having a radially outwardly extending pin (12) on the outer peripheral wall of the output shaft (11), the impeller assembly (2) including an impeller and a wheel disk (21) connected to the impeller, the wheel disk (21) being connected to the output shaft (11) of the motor (10); The impeller quick-release structure includes: A locking assembly is connected to the output shaft (11) of the motor (10) and located on the side of the wheel (21) away from the main body of the motor (10), for limiting the wheel (21) axially on the output shaft (11); The locking assembly is characterized in that: the locking assembly includes a knob (3) which defines a locking chamber (34) and has a mounting slot (320) on its side wall facing the wheel (21) for the output shaft (11) and its pin (12) to extend into the locking chamber (34). The locking chamber (34) is also provided with a limiting structure for locking and unlocking the output shaft (11) and its pin (12). The limiting structure is configured such that: when the output shaft (11) and its pin... (12) When the pin (12) is inserted into the locking chamber (34) from the mounting slot (320), the limiting structure limits the pin (12) in the axial direction of the output shaft (11) to prevent the output shaft (11) and its pin (12) from exiting the mounting slot (320); after the knob (3) rotates by a set angle about the output shaft (11) as the axis of rotation, the limiting structure releases the axial restriction on the pin (12) and allows it to exit the mounting slot (320); The locking assembly further includes: A rotation limiting member (4) is rotatably constrained in the locking chamber (34) with the output shaft (11) of the motor (10) as the rotation axis. The rotation limiting member (4) is provided with a sliding groove (41) for the output shaft (11) and its pin (12) to enter the locking chamber (34) and an exit groove (42) for the output shaft (11) and its pin (12) to exit the locking chamber (34) along its rotation direction. The side wall of the sliding groove (41) of the rotation limiting member (4) is also provided with A telescopic locking head (5) allows the pin (12) to enter the locking chamber (34) via the sliding groove (41) and restricts its exit from the sliding groove (41) after the pin (12) enters the locking chamber (34). The rotation limiting member (4) has at least a locked state in which its sliding groove (41) is opposite to the mounting slot (320) of the knob (3) and an unlocked state in which its exit groove (42) is opposite to the mounting slot (320) of the knob (3) as its rotation position changes. The first elastic element (71) acts on the rotation limiting element (4) and makes the rotation limiting element (4) always have a tendency to rotate from the position of the unlocked state to the position of the locked state. The locking chamber (34) of the knob (3) also has a guide groove (310) on its inner wall opposite to the rotation limiting member (4), which extends in the circumferential direction and connects the sliding groove (41) and the exit groove (42) of the rotation limiting member (4). When the knob (3) is pressed down by an external force along the extension direction of the output shaft (11), the pin (12) of the output shaft (11) can enter the guide groove (310) from the sliding groove (41) and rotate along the guide groove (310) to a set position to release the state of being pressed down by an external force and then enter the exit groove (42). When the pin (12) of the output shaft (11) enters the exit groove (42), it can drive the rotation limiting member (4) to rotate from the locked position to the unlocked position. The aforementioned rotating limiting member (4), telescopic locking head (5), and first elastic member (71) together constitute the limiting structure.

2. The impeller mounting structure of the centrifugal fan according to claim 1, characterized in that: The guide groove (310) of the knob (3) is connected to the sliding groove (41) and the exit groove (42) of the rotation limiting member (4) at its two ends in the extension direction.

3. The impeller mounting structure of the centrifugal fan according to claim 1, characterized in that: The pin (12) on the output shaft (11) has two sections symmetrically arranged about the axis of the output shaft (11), and the guide groove (310) on the knob (3) also has two corresponding sections.

4. The impeller mounting structure of the centrifugal fan according to claim 1, characterized in that: The locking chamber of the knob (3) is provided with a clearance channel (311) on the inner wall of the rotary limiting member (4) in the area opposite to the end of the output shaft (11) for the end of the output shaft (11) to extend into.

5. The impeller mounting structure of the centrifugal fan according to claim 1, characterized in that: The rotating limiting member (4) is a plate-shaped structure that is circular in shape. The outer periphery of the rotating limiting member (4) has a protrusion (43) that extends radially outward. The locking chamber has a positioning groove (38) that extends circumferentially and allows the protrusion (43) to slide and limit in the circumferential direction on the side wall opposite to the outer periphery of the rotating limiting member (4).

6. The impeller mounting structure of the centrifugal fan according to claim 5, characterized in that: The positioning groove (38) is generally arc-shaped, and the first elastic element (71) is a compression spring. The compression spring is arranged in the positioning groove (38) and abuts against the protrusion (43) of the rotation limiting element (4).

7. The impeller mounting structure of the centrifugal fan according to claim 1, characterized in that: The knob (3) includes a knob body (31) and a pressure plate (32). The knob body (31) has a boss (33) protruding toward the wheel (21) on the side wall facing the wheel (21). The boss (33) is hollow inside and forms a mounting opening (330) on the side facing the wheel (21). The pressure plate (32) covers the mounting opening (330) and together with the boss (33), defines the locking chamber (34).

8. The impeller mounting structure of the centrifugal fan according to claim 7, characterized in that: The boss (33) is located in the middle of the side wall of the knob body (31) facing the wheel (21). The side wall of the knob body (31) facing the wheel (21) is also provided with reinforcing ribs (35) arranged in circumferentially and connected to the outer peripheral wall of the boss (33).

9. The impeller mounting structure of the centrifugal fan according to claim 7, characterized in that: The locking assembly further includes: An axial limiting member (6) is provided on the side of the knob (3) facing the wheel (21) in such a way that it can move along the axial direction of the motor (10) shaft, and abuts against the wheel (21) in the axial direction of the output shaft (11). The axial limiting member (6) has a clearance opening (61) at a position opposite to the mounting slot (320). The second elastic element (72) acts between the axial limiting element (6) and the knob (3), and causes the knob (3) to always tend to move away from the axial limiting element (6) along the axial direction of the output shaft (11).

10. The impeller mounting structure of the centrifugal fan according to claim 9, characterized in that: The knob (3) has a receiving chamber (36) with an opening on one side facing the wheel (21), and the axial limiting member (6) is movably disposed in the receiving chamber (36).

11. The impeller mounting structure of the centrifugal fan according to claim 10, characterized in that: The axial limiting member (6) is a plate structure perpendicular to the output shaft (11). The axial limiting member (6) is connected to the knob (3) through the connecting shaft (63). The second elastic member (72) is a compression spring sleeved on the connecting shaft (63) and abutting between the axial limiting member (6) and the knob (3).

12. The impeller mounting structure of the centrifugal fan according to claim 11, characterized in that: The outer peripheral edge of the axial limiting member (6) slides in contact with the inner wall of the receiving chamber (36) of the knob member (3).

13. The impeller mounting structure of the centrifugal fan according to claim 12, characterized in that: The outer peripheral edge of the axial limiting member (6) also has a flange (62) extending toward the interior of the receiving chamber (36), and the flange (62) slides in contact with the inner wall of the receiving chamber (36) of the knob member (3).

14. The impeller mounting structure of the centrifugal fan according to claim 1, characterized in that: The rotating limiting member (4) is also provided with a placement groove (44) that communicates with the sliding groove (41). The telescopic clamp (5) is movably disposed in the placement groove (44) and has an extended state extending from the placement groove into the sliding groove (41) and a retracted state retracting from the sliding groove (41) into the placement groove (44).

15. The impeller mounting structure of the centrifugal fan according to claim 14, characterized in that: It also includes a third elastic element (73) acting on the telescopic head (5), under the action of the third elastic element (73), the telescopic head (5) always tends to move toward the sliding groove (41).

16. The impeller mounting structure of the centrifugal fan according to claim 15, characterized in that: The third elastic element (73) is a compression spring provided in the mounting groove (44). The first end of the compression spring abuts against the telescopic clip (5), and the other end abuts against the inner wall of the mounting groove (44).

17. The impeller mounting structure of the centrifugal fan according to claim 15, characterized in that: The telescopic chuck (5) has a guide slope (51) on the side wall facing the wheel (21) so that the pin (12) can press the telescopic chuck (5) toward the mounting groove (44) during the process of entering the sliding groove (41).

18. The impeller mounting structure of the centrifugal fan according to any one of claims 1 to 17, characterized in that: The outer peripheral wall of the knob (3) also has anti-slip recesses (37) arranged sequentially along its circumference and all recessed inward.

19. A centrifugal fan, comprising a volute (80), an impeller assembly (2), and a motor (10), wherein the main body of the motor (10) is connected to the volute (80), and the impeller assembly (2) is disposed within the volute (80) and connected to the output shaft (11) of the motor (10), characterized in that: The output shaft (11) of the motor (10) is connected to the impeller assembly (2) using the impeller mounting structure of the centrifugal fan as described in any one of claims 1-18.

20. A range hood, comprising a fan system, characterized in that: The fan system uses the centrifugal fan as described in claim 19.

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