A fan system and a range hood using the same

Abstract

The application discloses a fan system and a range hood applying the same. The fan system comprises: an impeller including a wheel disc; a motor including a motor body and an output shaft, the output shaft penetrating into the wheel disc and rotating synchronously; a hand-tightening device fixing the output shaft and the wheel disc; the motor further comprises an extension shaft including a shaft body coaxial with the output shaft, the shaft body extending from the end of the output shaft to a direction away from the motor body, the extension shaft penetrating through the wheel disc and the hand-tightening device; the hand-tightening device comprises a first shell and a second shell, the first shell and the second shell can synchronously rotate along the circumference of the motor; the hand-tightening device has a first position and a second position: in the first position, the first shell and the second shell can slide along the axial direction of the motor; in the second position, the first shell has a displacement along the circumferential direction of the motor relative to the first position, the second shell has a displacement along the axial direction of the motor relative to the first position, the extension shaft locks the first shell in the circumferential direction and presses the second shell against the wheel disc.

Description

Technical Field

[0001] This invention relates to power devices, particularly a fan system, and a range hood using the fan system. Background Technology

[0002] Range hoods have become an indispensable kitchen appliance in modern homes. They operate on the principles of fluid dynamics, using a centrifugal fan inside to draw in cooking fumes and a filter to remove some grease particles. The centrifugal fan consists of a casing, an impeller housed within the casing, and a motor that drives the impeller. When the impeller rotates, a negative pressure is generated at the center of the fan, drawing in the cooking fumes from below. After being accelerated by the fan, the fumes are collected by the casing and guided outwards.

[0003] For example, Chinese utility model patent application number 202220245829.8 discloses a centrifugal fan including a volute, an impeller, and a motor. The impeller is located inside the volute and is driven by the motor. The impeller includes a front disc, a rear disc, a middle disc, blades, and a wheel disc. The motor's output shaft passes through a fixed bushing of the wheel disc and is connected to a locking nut. The end of the motor's output shaft has a threaded section, which is a bidirectional threaded section. Correspondingly, the locking nut has a matching bidirectional threaded hole. Thus, the locking nut can be rotated in both the forward and reverse directions to lock onto the motor's output shaft.

[0004] The aforementioned patented impeller fixing nut uses a threaded connection, typically involving two steps during fixing: first, eliminating axial clearance through multi-turn spiral feeding; second, using mechanical equipment to forcibly pre-tighten the hand-tightened nut with a set torque. This two-step installation process, with its multi-turn rotation and tool-assisted operation, results in low production efficiency and high costs. Furthermore, the forced pre-tightening prevents the hand-tightened nut from being loosened by hand, causing inconvenience for users during self-cleaning or after-sales on-site cleaning, leading to a poor cleaning experience. Summary of the Invention

[0005] The first technical problem to be solved by the present invention is to provide a fan system that addresses the shortcomings of the prior art, with convenient disassembly and assembly of the impeller and motor, and high connection reliability.

[0006] The second technical problem to be solved by the present invention is to provide a range hood that uses the above-mentioned fan system.

[0007] The technical solution adopted by the present invention to solve the first technical problem mentioned above is: a fan system, comprising:

[0008] Impeller, including disc;

[0009] An electric motor includes a motor body and an output shaft. The motor body is located on one side of a wheel, and the output shaft passes through the wheel and rotates synchronously.

[0010] A hand-tightening device for fixing the output shaft and the wheel; characterized in that:

[0011] The motor also includes an extension shaft, which includes a shaft body coaxial with the output shaft. The shaft body extends from the end of the output shaft in a direction away from the motor body. The extension shaft passes through the wheel and the hand-tightening device.

[0012] The hand clamping device includes a first housing and a second housing, which can rotate synchronously along the circumference of the motor;

[0013] The hand-clamping device has a first position and a second position:

[0014] In the first position, the first housing and the second housing can slide along the motor axis;

[0015] In the second position, the first housing has a displacement along the circumference of the motor relative to the first position, and the second housing has a displacement along the axial direction of the motor relative to the first position. The extension shaft locks the first housing in the circumferential direction and presses the second housing against the wheel.

[0016] The axial and circumferential rotation of the hand-tightening device is controlled separately. The first housing limits the circumferential position of the wheel, and the second housing limits the axial position of the wheel. The circumferential position of the wheel is also limited by the circumferential limit of the first housing. It can be operated by simply rotating and pressing, which is convenient and reliable.

[0017] To facilitate circumferential locking of the first housing in conjunction with the extension shaft during rotation, the first and second housings can slide relative to each other along the axial direction of the motor, with the first housing maintaining a tendency to move away from the wheel.

[0018] Furthermore, the first housing is hollow and opens to one side toward the second housing, with the second housing correspondingly placed at the opening of the first housing;

[0019] The first housing has a through hole on the side away from the second housing, and a slot is provided adjacent to the through hole. The slot is formed by the outer end of the first housing being recessed inward.

[0020] The shaft body is provided with a first shaft pin, and the shape and size of the through hole are adapted to the first shaft pin. The through hole allows the first shaft pin to pass through, and the first shaft pin can be engaged in the slot, thereby locking the first housing relative to the extension shaft in the circumferential direction.

[0021] Furthermore, to facilitate the relative sliding of the first housing and the second housing, a guide post is provided between the first housing and the second housing to guide the relative sliding of the first housing and the second housing, and the guide post extends in a direction parallel to the output shaft.

[0022] Furthermore, to maintain the tendency of the first housing to move, the hand-clamping device also includes an elastic element, the two ends of which abut against the first housing and the second housing respectively, so that the first housing tends to move away from the second housing. In the second position, the elastic element is in a compressed state. In addition, the pressure applied by the compression of the elastic element generates friction in the rotation direction, which further restricts the rotation of the first housing.

[0023] To facilitate axial displacement of the second housing and the extension shaft during the rotation of the hand-tightening device, and to suppress impeller axial runout in the installed state, according to one aspect of the invention, a second shaft pin is provided on the shaft body, and a column is provided on the side of the second housing away from the wheel disk, through which the extension shaft passes. The end face of the column away from the wheel disk is inclined circumferentially, so that the second housing can be gradually pressed against the wheel disk by the second shaft pin when rotating from the first position to the second position.

[0024] To facilitate axial displacement of the second housing and the extension shaft during the rotation of the hand-tightening device, and to suppress impeller axial runout in the installed state, according to another aspect of the present invention, a column is provided on the side of the second housing away from the wheel disk, through which the extension shaft passes. A spiral guide groove is provided on the inner peripheral wall of the column, and a protrusion is provided on the outer peripheral wall of the shaft body. The protrusion can move along the guide groove, so that the second housing can be gradually pressed against the wheel disk by the second shaft pin when rotating from the first position to the second position.

[0025] To facilitate axial displacement of the second housing in conjunction with the extension shaft during the rotation of the hand-tightening device, and to suppress impeller axial runout in the installed state, according to another aspect of the invention, a column is provided on the side of the second housing away from the wheel disk, through which the extension shaft passes, and the shaft body and the column are threadedly connected, so that the second housing can be gradually pressed against the wheel disk by the second shaft pin when rotating from the first position to the second position.

[0026] To facilitate the rotation of the wheel by the motor's output shaft, a third shaft pin is provided on the output shaft. A groove is formed on the side of the wheel facing the motor body. The third shaft pin is inserted into the groove so that the output shaft and the wheel rotate synchronously.

[0027] Preferably, the wheel includes a disc-shaped disc body and a hollow connecting shaft, the motor body is located on one axial side of the disc body, the output shaft passes through the disc body and enters the connecting shaft, and the second housing abuts against the end face of the connecting shaft away from the disc body.

[0028] The technical solution adopted by the present invention to solve the second technical problem mentioned above is: a range hood, characterized in that: it applies a fan system as described above.

[0029] Compared with the prior art, the advantages of the present invention are: the axial and circumferential rotation of the hand-tightening device are managed separately, the first housing defines the circumferential position of the wheel, the second housing defines the axial position of the wheel, and the circumferential position of the wheel is defined simultaneously by the circumferential limit of the first housing. During operation, only rotation and pressing are required, which is convenient and reliable. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the fan system according to the first embodiment of the present invention;

[0031] Figure 2 This is a schematic diagram of the installation of the impeller and motor of the fan system according to the first embodiment of the present invention;

[0032] Figure 3 for Figure 2 A schematic diagram of the decomposed structure;

[0033] Figure 4 This is an exploded view of the hand-tightening device of the fan system according to the first embodiment of the present invention;

[0034] Figure 5 This is a schematic diagram of the first housing of the hand-tightening device of the fan system according to the first embodiment of the present invention;

[0035] Figure 6 This is a schematic diagram of the first housing of the hand-tightening device of the fan system according to the first embodiment of the present invention;

[0036] Figure 7-1 This is a schematic diagram of the initial installation state of the impeller and motor of the wind turbine system according to the first embodiment of the present invention (half-section of the first housing);

[0037] Figure 7-2 This is a top view (half-section of the first housing) of the wind turbine system in the initial installation state of the first embodiment of the present invention;

[0038] Figure 8 This is a schematic diagram (half-section of the first housing) showing the installation process of the impeller and motor of the fan system according to the first embodiment of the present invention.

[0039] Figure 9-1 This is a schematic diagram (half-section of the first housing) showing the installation process of the impeller and motor of the fan system according to the first embodiment of the present invention.

[0040] Figure 9-2This is a schematic diagram (half-section of the first housing) showing the installation process of the impeller and motor of the fan system according to the first embodiment of the present invention.

[0041] Figure 10 This is a schematic diagram of the completed installation state of the impeller and motor of the fan system according to the first embodiment of the present invention (half-section of the first housing);

[0042] Figure 11 This is a cross-sectional view of the impeller and motor of the wind turbine system according to the first embodiment of the present invention in their installation state.

[0043] Figure 12 This is a partial sectional view of the impeller and motor of the fan system according to the second embodiment of the present invention, showing their installation state.

[0044] Figure 13 This is a schematic diagram of the second housing of the hand-tightening device of the fan system according to the second embodiment of the present invention;

[0045] Figure 14 This is a schematic diagram of the extension shaft of the motor in the fan system according to the second embodiment of the present invention;

[0046] Figure 15 This is a partial sectional view of the impeller and motor of the wind turbine system according to the third embodiment of the present invention, showing their installation state.

[0047] Figure 16 This is a schematic diagram of the second housing of the hand-tightening device of the fan system according to the third embodiment of the present invention;

[0048] Figure 17 This is a schematic diagram of the extension shaft of the motor of the fan system according to the third embodiment of the present invention. Detailed Implementation

[0049] The embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions.

[0050] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Since the embodiments disclosed in this invention can be arranged in different directions, these terms indicating direction are only for illustration and should not be regarded as limitations. For example, "upper" and "lower" are not necessarily limited to directions opposite to or consistent with the direction of gravity. In addition, features defined with "first" and "second" may explicitly or implicitly include one or more of such features.

[0051] Example 1

[0052] See Figure 1 and Figure 2 A fan system includes a volute 1, an impeller 2 disposed within the volute 1, and a motor 3 for driving the impeller 2 to rotate.

[0053] The impeller 2 includes a front disc 21, a rear disc (not shown), a middle disc 23 positioned between the front disc 21 and the rear disc, and blades 24. The blades 24 extend axially along the fan system, passing through the front disc 21, middle disc 23, and rear disc, and are fixed to each of these discs, forming a double-inlet fan. Alternatively, the impeller 2 may omit the middle disc 23, forming a single-inlet fan. This structure is identical to that of existing centrifugal fans and will not be described further. Alternatively, the fan system can also be an axial flow fan, a cross-flow fan, etc., as long as it includes the impeller 2 and the motor 3, requiring the impeller 2 and the motor 3 to be connected.

[0054] The impeller 2 also includes a disc 25 for fixing to the motor 3. The disc 25 can be fixed to the middle disc 23 (dual air intake) or the rear disc (single air intake). The motor 3 includes a motor body 31 and an output shaft 32. The disc 25 includes a disc-shaped disc body 251 and a hollow connecting shaft 252. The motor body 31 is located on one axial side of the disc body 251, and the output shaft 32 passes through the disc body 251 and is inserted into the connecting shaft 252. The output shaft 32 of the motor 3 and the disc 25 of the impeller 2 are fixed by a hand-tightening device 4.

[0055] See Figures 3-6The hand-clamping device 4 includes a first housing 41, a second housing 42, a guide post 43, and an elastic element 44. The first housing 41 is a hollow column, and the second housing 42 can be a base-like structure. The first housing 41 has an opening facing the second housing 42, and the second housing 42 can be correspondingly placed at the opening of the first housing 41. Preferably, the first housing 41 covers the outer periphery of the second housing 42. The first housing 41 and the second housing 42 are slidably engaged, and can slide relative to each other along the axial direction of the output shaft 32 of the motor 3 (described in this invention as the axial direction of the motor 3, which is the axial direction of the output shaft 32). To facilitate guiding the sliding of the first housing 41 and the second housing 42, the aforementioned guide post 43 is fixedly provided on the second housing 42. The guide post 43 extends in a direction parallel to the output shaft 32, and can penetrate the first housing 41 along the axial direction of the motor 3 away from the second housing 42. The guide post 43 is slidably connected to the first housing 41. An elastic element 44, preferably a spring, is sleeved around the outer periphery of the guide post 43. Its two ends abut against the first housing 41 and the second housing 42, respectively, causing the first housing 41 to tend to move away from the second housing 42. Alternatively, the guide post 43 can be fixed to the first housing 41 and slidably connected to the second housing 42. The guide post 43 also allows the first housing 41 and the second housing 42 to rotate synchronously around the circumference of the motor 3 (i.e., around the axial direction of the motor 3).

[0056] The first housing 41 has a through hole 411 and a slot 412 on the side away from the second housing 42. The through hole 411 is an elongated hole that matches the shape of the first shaft pin 331 described below. The slot 412 is formed by recessing inward (towards the second housing 42) from the outer end face of the first housing 41 (the end face away from the second housing 42). The slot 412 is arranged adjacent to the through hole 411. Preferably, there are two slots 412, arranged on opposite sides of the through hole 411, which also match the shape of the first shaft pin 331 described below.

[0057] The motor 3 also includes an extension shaft 33, which includes a shaft body 333. The extension shaft 33 extends coaxially from the end of the output shaft 32 away from the motor body 31 in a direction away from the motor body 31, and can pass through the first housing 41 and the second housing 42. The shaft body 333 and the output shaft 32 can be an integral structure or a separate structure. In this embodiment, it is a separate structure, and the end of the output shaft 32 can be inserted into the shaft body 333 for connection and fixation.

[0058] The extension shaft 33 also includes a first pin 331 and a second pin 332 disposed on the shaft body 333. Preferably, the axial directions of both the first pin 331 and the second pin 332 are perpendicular to the axial direction of the motor 3. Compared to the first pin 331, the second pin 332 is closer to the output shaft 32. The shape and size of the through hole 411 of the first housing 41 are adapted to the first pin 331, allowing the first pin 331 to pass through. Guide rails 413 can be disposed on both sides of the through hole 411 of the first housing 41. The surface of the guide rail 413 (the surface away from the second housing 42) is higher than the through hole 411, and the aforementioned slot 412 is formed within the guide rail 413. Preferably, the surface of the guide rail 413 is a plane, perpendicular to the axial direction of the motor 3, guiding the hand-clamping device 4 to rotate relative to the extension shaft 33 along the circumference of the motor 3.

[0059] The second housing 42 abuts against the end face of the connecting shaft 252 of the wheel 25 away from the motor body 31. A column 421 is formed on the side of the second housing 42 facing the cavity jointly formed by the first housing 41 and the second housing 42. A through hole 4211 is provided in the column 421, penetrating both opposite ends of the column 421 along the axial direction of the motor 3, allowing the extension shaft 33 to pass through. The end face of the column 421 away from the wheel 25 is inclined circumferentially (i.e., the axial height of the column 421 is not equal). The through hole 4211 also penetrates the side of the second housing 42 that abuts against the wheel 25.

[0060] A third shaft pin 321 is provided on the output shaft 32 of the motor 3. It is perpendicular to the output shaft 32 and can have a certain angle with the first shaft pin 331. The disc body 251 of the wheel 25 has a groove 253 formed on the side facing the motor body 31. The third shaft pin 321 can be inserted into the groove 253. (See reference...) Figure 11 The shape of the groove 253 is adapted to the third shaft pin 321, preferably in a straight line. When the third shaft pin 321 is engaged in the groove 253, the output shaft 32 can drive the wheel 25 to rotate synchronously. This kind of cooperation between the third shaft pin 321 and the wheel 25 is prior art. For details, please refer to the fan impeller mounting structure of a deep range hood disclosed in the applicant's prior application with application number CN01239583.8, which will not be described again here.

[0061] See Figure 7-1 and Figure 7-2In the initial installation state of the impeller 2 and motor 3 (the second housing 42 is placed on the wheel 25, and the extension shaft 33 of the motor 3 passes through the wheel 25), the first shaft pin 331, the second shaft pin 332, and the through hole 411 of the first housing 41 are aligned. Then, as shown in the figure, the hand-tightening device 4 is installed from top to bottom. The second shaft pin 332 and the first shaft pin 331 pass through the column 421 in sequence. The second shaft pin 332 enters the cavity formed by the first housing 41 and the second housing 42, while the first shaft pin 331 passes through the through hole 441 and is located on the side of the through hole 441 away from the second housing 42. There is a small gap between the second shaft pin 332 and the end face of the column 42 away from the wheel 25. The third shaft pin 321 is stuck in the groove 253 of the wheel 25. This state is the first position of the hand-tightening device 4. At this time, the hand-tightening device 4 only has two degrees of freedom: linear movement relative to the extension shaft 33 along the axial direction of the motor 3.

[0062] See Figure 8 During installation, firstly, press the hand-tightening device 4 towards the wheel 25 and rotate it circumferentially along the motor 3. At this time, the first housing 41 compresses the elastic element 44 and moves downwards towards the wheel 25, while the second housing 42 abuts against the wheel 25. When the hand-tightening device 4 is fully pressed down, the elastic element 44 is compressed to its maximum extent. Due to the rotation and linear movement of the hand-tightening device 4, the first shaft pin 331 is no longer opposite the through hole 411, but opposite the guide rail 413. It can then rotate along the surface of the guide rail 413. Since the end face of the column 421 of the second housing 42 is inclined, the distance between the second shaft pin 332 and the end face of the column 421 decreases as the hand-tightening device 4 rotates. At this time, the elastic element 44 is in a compressed state, and remains compressed throughout the entire process. Then, see... Figure 9-1 and Figure 9-2 As the rotation continues, the second pin 332 eventually contacts the end face of the column 421, at which point it can no longer rotate. At the same time, the slot 412 in the guide rail 413 rotates to correspond with the first pin 331.

[0063] See Figure 10 and Figure 11Upon release, the first housing 41 rebounds under the restoring force of the elastic element 44, moving away from the wheel 25. This causes the first shaft pin 331 to fall into the slot 412, placing the first housing 41 and the extension shaft 33 in a circumferentially locked state. At this time, the elastic element 44 remains compressed, completing the installation of the impeller 2 and the motor 3. The circumferential locking is due to the first shaft pin 331 fitting into the slot 412, limiting its circumferential position. Simultaneously, the pressure applied by the elastic element 44 creates friction in the rotational direction, further restricting the rotation of the first housing 41. Meanwhile, the second shaft pin 332 abuts against the end face of the column 421, pressing the second housing 42 against the wheel 25, placing it in an axially locked state. Friction then fixes the hand-tightening device 4 to the wheel 25. This state represents the second position of the hand-tightening device 4.

[0064] Thus, the axial and circumferential rotation of the hand-tightening device 4 are managed separately. The axial clearance is eliminated by the spiral feed method, and the circumferential rotation is avoided by the elastic force of the elastic element 44, the guide rail 413 with the slot 412, and each shaft pin.

[0065] The hand-tightening device 4 of the present invention can solve the axial runout of the impeller 2: ① The contact surface between the second shaft pin 332 and the mobile phone device 4 is an inclined surface. As the rotation angle is different, the distance between the second shaft pin 332 and the inclined surface becomes smaller and smaller until the second shaft pin 332 contacts the inclined surface; ② When the first housing 41 is no longer pressed, the elastic element 44 is in a compressed state, and the force-bearing surface is the first shaft pin 331 and the wheel disk 25 of the impeller 2.

[0066] If the impeller 2 jumps during rotation, the impeller 2's disc 25 transmits force to the second housing 42, and the second housing 42 transmits force to the second shaft pin 332, thereby suppressing axial runout. If there is a slight gap between the second shaft pin 332 and the column 421, when the impeller 2 jumps, the impeller 2's disc 25 transmits force to the second housing 42, and the second housing 42 will tend to jump towards the second shaft pin 332. The movement of the second housing 42 will suppress the elastic element 44. At this time, the elastic element 44 will suppress the runout of the second housing 42, which will also help suppress axial runout.

[0067] Example 2

[0068] See Figures 12-14In this embodiment, the difference from Embodiment 1 is that the inclined surface of the column 421 and the second shaft pin 332 of the extension shaft 33 are omitted. Instead, a spiral guide groove 422 is provided on the inner peripheral wall of the column 421. The guide groove 422 has a travel in the axial direction of the output shaft 32. A protrusion 334 is provided on the outer peripheral wall of the shaft body 333. Preferably, two protrusions 334 are provided, symmetrically positioned relative to the circumferential direction of the extension shaft 32, and with different axial heights. The protrusions 334 can move along the guide groove 422, allowing the second housing 42 to move axially while rotating. Axial clamping is achieved through the guide groove 422 and the protrusions 334.

[0069] When the hand-tightening device 4 is tightened counterclockwise, the protrusion 334 enters the guide groove 422 of the second housing 42. As the rotation angle increases, the protrusion 334 presses the second housing 42 towards the wheel 25, pressing the second housing 42 and the wheel 25 together to eliminate axial clearance. Similar to Embodiment 1, the protrusion 334 can suppress axial runout of the guide groove 422 (second housing 42).

[0070] Example 3

[0071] See Figures 15-17 In this embodiment, the difference from the first embodiment is that an internal thread 423 is provided on the inner peripheral wall of the column 421 to replace the guide groove 422, and an external thread 335 is provided on the outer peripheral wall of the shaft body 333 at the position corresponding to the internal thread 423 to replace the protrusion 334. The cooperation of the external thread 335 and the internal thread 423 enables the second housing 42 to move circumferentially and axially while rotating. Axial clamping is achieved through the external thread 335 and the internal thread 423.

[0072] When the hand-tightening device 4 is tightened counterclockwise, the external thread 335 enters the cylinder 421 of the second housing 42 and is threadedly connected to the internal thread 423. As the rotation angle increases, the extension shaft 33 forces the second housing 42 to press against the wheel 25, thereby eliminating the axial clearance.

Claims

1. A fan system, comprising: Impeller (2), including disc (25); The motor (3) includes a motor body (31) and an output shaft (32). The motor body (31) is located on one side of the wheel (25), and the output shaft (32) passes through the wheel (25) and rotates synchronously. A hand-tightening device (4) for fixing the output shaft (32) and the wheel (25); characterized in that: The motor (3) also includes an extension shaft (33), which includes a shaft body (333) coaxial with the output shaft (32). The shaft body (333) extends from the end of the output shaft (32) in a direction away from the motor body (31). The extension shaft (33) passes through the wheel (25) and the hand clamping device (4). The hand clamping device (4) includes a first housing (41) and a second housing (42), and the first housing (41) and the second housing (42) can rotate synchronously along the circumference of the motor (3); The hand-gripping device (4) has a first position and a second position: In the first position, the first housing (41) and the second housing (42) can slide along the axial direction of the motor (3); In the second position, the first housing (41) has a displacement along the circumference of the motor (3) relative to the first position, and the second housing (42) has a displacement along the axial direction of the motor (3) relative to the first position. The extension shaft (33) locks the first housing (41) in the circumference and presses the second housing (42) against the wheel (25). The first housing (41) and the second housing (42) can slide relative to each other along the axial direction of the motor (3). The first housing (41) tends to move away from the wheel (25). The hand clamping device (4) also includes an elastic element (44). The two ends of the elastic element (44) abut against the first housing (41) and the second housing (42) respectively, so that the first housing (41) tends to move away from the second housing (42). In the second position, the elastic element (44) is in a compressed state.

2. The fan system of claim 1, wherein: The first housing (41) is hollow and opens to one side toward the second housing (42), and the second housing (42) is placed at the opening of the first housing (41); The first housing (41) has a through hole (411) on the side away from the second housing (42), and a slot (412) is provided adjacent to the through hole (411). The slot (412) is formed by the outer end face of the first housing (41) being recessed inward. The shaft body (333) is provided with a first shaft pin (331). The shape and size of the through hole (411) are adapted to the first shaft pin (331). The through hole (411) allows the first shaft pin (331) to pass through. The first shaft pin (331) can be inserted into the slot (412), thereby locking the first housing (41) relative to the extension shaft (33) in the circumferential direction.

3. The fan system according to claim 1, characterized in that: A guide post (43) is provided between the first housing (41) and the second housing (42) for guiding the relative sliding of the first housing (41) and the second housing (42), the guide post (43) extending in a direction parallel to the output shaft (32).

4. The fan system according to claim 1, characterized in that: A second shaft pin (332) is provided on the shaft body (333). A column (421) is provided on the side of the second housing (42) away from the wheel (25). The column (421) is for the extension shaft (33) to pass through. The end face of the column (421) away from the wheel (25) is inclined in the circumferential direction, so that when the second housing (42) rotates from the first position to the second position, it can be gradually pressed against the wheel (25) by the second shaft pin (332).

5. The fan system according to claim 1, characterized in that: A column (421) is provided on the side of the second housing (42) away from the wheel (25). The column (421) is for the extension shaft (33) to pass through. A spiral guide groove (422) is provided on the inner peripheral wall of the column (421). A protrusion (334) is provided on the outer peripheral wall of the shaft body (333). The protrusion (334) can move along the guide groove (422) so that when the second housing (42) rotates from the first position to the second position, it can be gradually pressed against the wheel (25) by the second shaft pin (332).

6. The fan system according to claim 1, characterized in that: The second housing (42) has a column (421) on the side away from the wheel (25). The column (421) is for the extension shaft (33) to pass through. The shaft body (333) and the column (421) are threaded together, so that when the second housing (42) rotates from the first position to the second position, it can be gradually pressed against the wheel (25) by the second shaft pin (332).

7. The fan system according to claim 1, characterized in that: The output shaft (32) is provided with a third shaft pin (321), and the wheel (25) has a groove (253) formed on the side facing the motor body (31). The third shaft pin (321) is inserted into the groove (253) so that the output shaft (32) and the wheel (25) rotate synchronously.

8. The fan system according to claim 1, characterized in that: The wheel (25) includes a disc-shaped disc body (251) and a hollow connecting shaft (252). The motor body (31) is located on one axial side of the disc body (251). The output shaft (32) passes through the disc body (251) and enters the connecting shaft (252). The second housing (42) abuts against the end face of the connecting shaft (252) away from the disc body (251).

9. A range hood, characterized in that: The application uses a fan system as described in any one of claims 1 to 8.

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