Self-adaptive impeller and range hood comprising same

Abstract

The utility model provides a self-adaptive impeller and a range hood comprising the same, the self-adaptive impeller comprises an impeller upper disc, an impeller middle disc, an impeller lower disc and a blade, and further comprises a transmission part, the transmission part is positioned between the impeller upper disc and the impeller middle disc, and the transmission part is clamped with the inlet end of the blade; the driving part is arranged in the axial direction of the self-adaptive impeller, the driving part is used for pushing the transmission part to be close to or far away from the impeller middle disc in the axial direction of the self-adaptive impeller, and when the transmission part is close to or far away from the impeller middle disc through the driving part, the driving part drives the transmission part to rotate. The transmission part rotates in the radial direction of the self-adaptive impeller and drives the angles of the inlet ends of the blades to be increased or decreased. And the air volume sensor is electrically connected with the driving part, and when the air volume sensor detects that the air volume in the self-adaptive impeller is different from the rotating speed of the corresponding impeller, the air volume sensor is communicated with the driving part through a control panel.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of self-adapting impeller and range hood comprising it. BACKGROUND

[0002] Range of range hood can usually be divided into weak block, strong block, automatic block, and outlet air volume is not identical when the speed of impeller is different at different range, and the inlet and outlet angle of impeller blade is designed at a certain design operating point (air volume) at present. That is to say, at the design operating point, because the inlet and outlet angle of impeller blade is reasonable, so the gas flow in the impeller passage is relatively uniform.

[0003] Therefore, only when air volume is close to design operating point, the gas flow in the impeller passage is relatively uniform, flow separation is weakened, and aerodynamic noise is reduced. When actual air volume is lower than design operating point air volume, gas enters the impeller passage slowly, and the space in the impeller passage is not full. Because the gas flow rate in the impeller passage is not uniform, the pressure distribution is not uniform, which leads to pressure difference and flow separation. When actual air volume is higher than design operating point air volume, the speed of impeller is higher, and the gas flow rate into the impeller is faster. Because the inlet and outlet angle of blade does not match the design operating point, the angle of gas impacting the pressure surface of blade is large after flowing into the impeller passage, which causes large energy loss, and the unstable gas flow is more violent, which leads to strong flow separation, so aerodynamic noise increases and efficiency decreases sharply. SUMMARY

[0004] The utility model wants to solve the technical problem that the inlet and outlet angle of blade does not match the speed of impeller at different range in the working process of range hood in the prior art, and provides a kind of self-adapting impeller and range hood comprising it.

[0005] The utility model solves the above technical problem by the following technical scheme:

[0006] A kind of self-adapting impeller, the self-adapting impeller includes impeller upper disc, impeller middle disc, impeller lower disc and blade, and the self-adapting impeller further includes:

[0007] Transmission part, the transmission part is located between the impeller upper disc and the impeller middle disc, the transmission part is synchronous with the blade, and the transmission part is connected with the inlet end of the blade;

[0008] Driving part, the driving part is arranged along the axial direction of the self-adapting impeller, and the driving part is used to push the transmission part to be close to or away from the impeller middle disc along the axial direction of the self-adapting impeller. When the transmission part is close to or away from the impeller middle disc by the driving part, the transmission part rotates along the radial direction of the self-adapting impeller and drives the angle of the inlet end of the blade to increase or decrease;

[0009] An airflow sensor is electrically connected to a control board, which in turn is electrically connected to the drive unit. When the airflow sensor detects that the airflow in the adaptive impeller is different from the corresponding impeller speed, the airflow sensor connects to the drive unit through the control board.

[0010] In this solution, a transmission unit and a drive unit are incorporated to adjust the inlet angle of the high-speed rotating blades. An airflow sensor activates the drive unit to match the inlet angle of the blades at different speeds with the actual operating conditions, thereby reducing energy loss, minimizing gas flow separation, reducing aerodynamic noise, and improving impeller efficiency. The transmission unit moves along the axis of the adaptive impeller and then rotates radially to change the inlet angle of the blades. Compared to the drive unit directly driving the blades radially, which easily leads to jamming between the high-speed rotating blades and the components driving the blades, the transmission unit maintains synchronous rotation with the blades during radial rotation, i.e., a relatively stationary state. Furthermore, the transmission unit rotates further from this relatively stationary state to avoid jamming while still achieving the desired change in the inlet angle of the blades.

[0011] Preferably, the transmission unit includes a turntable and a connecting assembly, the radius of the turntable being smaller than the axial dimension from the inlet end of the blade to the adaptive impeller, and the connecting assembly being located between the edge of the turntable and the inlet end of the blade.

[0012] In this solution, the above-mentioned configuration is used to avoid direct contact between the turntable and the blade. Instead, the turntable is connected to the inlet end of the blade via a connecting component, thereby indirectly transmitting the rotational torque and preventing the blade from jamming, which may occur with direct transmission.

[0013] Preferably, the turntable has a guide block on the side facing the impeller disk, and the impeller disk is provided with a guide groove corresponding to the guide block. The guide groove is arranged circumferentially along the impeller disk and has an inclined slope.

[0014] Alternatively, both the guide block and the guide groove may have inclined slopes, and the slopes on the guide block and the guide groove may be in opposite directions.

[0015] In this scheme, the above settings are used to convert the axial motion of the turntable into radial motion.

[0016] Preferably, multiple guide blocks and guide grooves are provided.

[0017] In the scheme, the stability of the radial rotating rotating disc is improved by increasing the number of guide blocks and guide slots to set the guide blocks and guide slots at different positions, thereby ensuring the stability of the inlet end angle change of the driven blade and preventing the blade from being stuck under high-speed rotation.

[0018] Preferably, the connecting assembly comprises a first connecting piece arranged in the axial direction of the adaptive impeller and a second connecting piece arranged in the radial direction of the adaptive impeller, the edge of the rotating disc is provided with a mounting groove, one end of the first connecting piece extends into the mounting groove, the other end of the first connecting piece is connected with the second connecting piece, the end of the second connecting piece away from the first connecting piece has an opening, and the inlet end of the blade is clamped in the opening.

[0019] In the scheme, the position of the first connecting piece in the mounting groove remains unchanged when the rotating disc moves axially, only the depth of the first connecting piece extending into the mounting groove changes, and the first connecting piece moves in the mounting groove when the rotating disc rotates radially, so that the second connecting piece moves with the first connecting piece, thereby realizing the rotation of the inlet end of the driven blade.

[0020] Preferably, the transmission part further comprises a resilient member arranged between the rotating disc and the impeller disc.

[0021] In the scheme, the inlet end angle of the blade can be restored in time after the inlet end angle of the blade is adjusted to follow the movement of the rotating disc, so that the inlet end angle of the blade at different rotating speeds under different gear positions of the impeller matches the actual working condition.

[0022] Preferably, the driving part comprises a driving motor and a push rod connected with the driving motor, when the driving part is turned on, the push rod is driven by the driving motor and pushes the transmission part.

[0023] In the scheme, the driving part drives the transmission part to move in the axial direction.

[0024] Preferably, the driving part further comprises a lead screw, the output shaft of the driving motor is connected with the lead screw, the lead screw is screwed with the push rod, and the end of the push rod away from the driving motor is connected with the transmission part.

[0025] In the scheme, the lead screw is screwed with the push rod, the driving motor drives the lead screw to rotate, thereby ensuring the accuracy of driving the push rod, and the accuracy of driving the blade by the transmission part is also ensured.

[0026] Preferably, the driving part further comprises a guide rail extending from the driving motor towards the transmission part, and the screw rod and the push rod are located in the guide rail.

[0027] In the present solution, the push rod is prevented from deviating from the axial direction of the impeller when being driven.

[0028] A range hood comprising the self-adapting impeller as described above.

[0029] In the present solution, the range hood comprises the self-adapting impeller as described above to rotate the inlet end of the blades to match the inlet end angle of the blades at different rotating speeds with the actual working condition, and the driving part is connected by the air volume sensor to improve the automation of the impeller. The process of rotating the blades is precise, and the blades are prevented from being stuck, thereby improving the safety and convenience of the impeller and the range hood.

[0030] The positive progress effect of the present utility model lies in that: the present utility model sets the transmission part and the driving part to adjust the inlet end angle of the blades in high-speed rotation, and the driving part is connected by the air volume sensor to match the inlet end angle of the blades at different rotating speeds with the actual working condition, thereby reducing energy loss, reducing gas flow separation, reducing aerodynamic noise, and improving the working efficiency of the impeller. The transmission part moves along the axial direction of the self-adapting impeller and then rotates in the radial direction to change the inlet end angle of the blades. Compared with the case that the driving part directly rotates the blades in the radial direction, the blades in high-speed rotation are prone to be stuck with the parts rotating the blades. In the process of radial rotation of the transmission part, the blades rotate synchronously, i.e. in a relatively static state, and the transmission part further rotates on the basis of the relatively static state to avoid being stuck and change the inlet end angle of the blades. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 It is a perspective view of the range hood of a preferred embodiment of the present utility model.

[0032] Figure 2 It is a perspective view of the impeller of a preferred embodiment of the present utility model.

[0033] Figure 3 It is a perspective view of the impeller of a preferred embodiment of the present utility model. Figure 2

[0034] Figure 4 It is a position relationship diagram of the turntable and the blades of a preferred embodiment of the present utility model.

[0035] Figure 5 It is a position relationship diagram of the guide block and the elastic member of a preferred embodiment of the present utility model.

[0036] ​Figure 6 is a partial enlarged view of the first connecting piece. Figure 5

[0037] Figure 7 is a structure schematic view of the guide groove of a preferred embodiment of the present application.

[0038] Figure 8 is a position relation view of the lead screw and the push rod of a preferred embodiment of the present application.

[0039] BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Transmission part 1

[0041] Rotating disc 11

[0042] Guide block 111

[0043] Connecting assembly 12

[0044] First connecting piece 121

[0045] Second connecting piece 122

[0046] Elastic member 13

[0047] Driving part 2

[0048] Driving motor 22

[0049] Push rod 23

[0050] Lead screw 24

[0051] Guide rail 25

[0052] Slope surface 3

[0053] Mounting groove 4

[0054] Impeller upper disc 10

[0055] Impeller middle disc 20

[0056] Guide groove 21

[0057] Impeller lower disc 30

[0058] Blade 40

[0059] Inlet end 41

[0060] Self-adaptive impeller 100 DETAILED DESCRIPTION

[0061] The present application will be described in more detail below with reference to the drawings.

[0062] The present application provides a self-adaptive impeller 100, and the specific structure is as shown in Figure 1 , Figure 2 ,​Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 、 Figure 7 and Figure 8 As shown in the figure, the adaptive impeller 100 comprises an impeller upper disc 10, an impeller middle disc 20, an impeller lower disc 30 and blades 40, and further comprises:

[0063] a transmission part 1, which is located between the impeller upper disc 10 and the impeller middle disc 20, and rotates synchronously with the blades 40, and is clamped with the inlet ends 41 of the blades 40;

[0064] a driving part 2, which is arranged along the axial direction of the adaptive impeller 100, and is used to push the transmission part 1 to move towards or away from the impeller middle disc 20 along the axial direction of the adaptive impeller 100, so that when the transmission part 1 moves towards or away from the impeller middle disc 20 through the driving part 2, the transmission part 1 rotates along the radial direction of the adaptive impeller 100 and drives the angle of the inlet ends 41 of the blades 40 to increase or decrease;

[0065] an air volume sensor (not shown in the figure), which is electrically connected with a control board, and the control board is electrically connected with the driving part 2, so that when the air volume sensor detects that the air volume in the adaptive impeller 100 is different from the corresponding impeller rotating speed, the air volume sensor turns on the driving part 2 through the control board (not shown in the figure).

[0066] Specifically, the transmission part 1, the impeller upper disc 10 and the impeller middle disc 20 are coaxially arranged and synchronously rotate, the transmission part 1 is arranged close to the impeller middle disc 20, and the transmission part 1 is clamped with the inlet end 41 of the blade 40, thereby realizing the connection with the blade 40, while the outlet end of the blade 40 has a groove to be clamped with the hole wall of the impeller middle disc 20 for installing the blade 40, that is, the angle of the outlet end of the blade 40 cannot be adjusted. It can be understood that the transmission part 1 and the blade 40 remain relatively static under synchronous rotation, so as to prevent the blade 40 from being clamped with the impeller middle disc 20 when the transmission part 1 rotates too fast or too slow. The embodiment is also provided with the driving part 2, which is arranged on the fan support of the adaptive impeller 100, and the driving part 2 pushes the transmission part 1 to approach or move away from the impeller middle disc 20 along the axial direction of the adaptive impeller 100. It should be noted that, compared with the traditional way of directly driving the parts to rotate radially through the driving structure, it is difficult to arrange the driving structure and the impeller, and the direct driving also makes the angle of the inlet end 41 of the blade 40 change, which is difficult to match the rotation speed of the impeller, so that the blade 40 is easily clamped with the impeller middle disc 20. In the embodiment, when the driving part 2 drives the transmission part 1 to approach or move away from the impeller middle disc 20 along the axial direction, the transmission part 1 can convert the force received in the axial direction into the power of radial rotation, that is, convert the axial movement into radial movement, so that the transmission part 1 and the blade 40 remain relatively static after the transmission part 1 is driven by the driving part 2, and the transmission part 1 further rotates on the basis of the static state, the slight rotation of the transmission part 1 is transmitted to the blade 40, and the blade 40 synchronously rotates with the transmission part 1, so as to prevent the inlet end 41 or the outlet end of the blade 40 from rotating under high-speed rotation and being clamped with the impeller middle disc 20 when the transmission structure is lacking, and the change of the angle of the inlet end 41 of the blade 40 can also be realized.

[0067] In the embodiment, the transmission part 1 rotates along the radial direction of the adaptive impeller 100 to increase or decrease the angle of the inlet end 41 of the blade 40. In the embodiment, the angle of the inlet end 41 of the blade 40 is decreased when the transmission part 1 is close to the impeller center disc 20, and the angle of the inlet end 41 of the blade 40 is increased when the transmission part 1 is away from the impeller center disc 20, but the embodiment is not limited to this. In the embodiment, the air volume sensor and the control board are also provided. The air volume sensor is a sensor for measuring the air volume in the impeller in the prior art, which is not described in detail herein. The control board is a structure provided in the extractor hood. The air volume sensor is electrically connected with the control board, and the driving part 2 is electrically connected with the control board. By integrating the air volume sensor on the control board in the extractor hood, the additional circuit structure is reduced, and the manufacturing cost is reduced. By setting the transmission part 1 and the driving part 2 to cooperate with each other, the angle of the inlet end 41 of the blade 40 in high-speed rotation is adjusted, and the signal is transmitted to the control board by the air volume sensor. The control board is correspondingly connected with the driving part 2 to match the angle of the inlet end 41 of the blade 40 at different rotating speeds with the actual working condition, thereby reducing the energy loss, reducing the flow separation of the gas, reducing the aerodynamic noise, and improving the working efficiency of the impeller. It should be noted that the control board and the signal feedback thereof are not improved in the embodiment, which are the prior art and are not described in detail herein.

[0068] In the embodiment, the transmission part 1 includes a rotating disc 11 and a connecting assembly 12. The radius of the rotating disc 11 is smaller than the dimension from the inlet end 41 of the blade 40 to the axis of the adaptive impeller 100.

[0069] Specifically, the rotating disc 11 is a disc structure, and the diameter of the rotating disc 11 is smaller than the diameter of the impeller center disc 20. At the same time, the radius of the rotating disc 11 is smaller than the dimension from the inlet end 41 of the blade 40 to the axis of the adaptive impeller 100, so that when the rotating disc 11 and the blade 40 rotate synchronously, the edge of the rotating disc 11 is prevented from contacting the blade 40 to avoid being stuck. The connecting assembly 12 is arranged at the edge of the rotating disc 11 to connect the blade 40 indirectly through the connecting assembly 12. When the rotating disc 11 is pushed by the driving part 2 to move along the axial direction of the adaptive impeller 100, the rotating disc 11 converts the axial direction movement into the radial direction movement, so that the rotating disc 11 does not directly contact the blade 40, but is clamped with the inlet end 41 of the blade 40 through the connecting assembly 12 to indirectly transmit the torque of rotation, thereby preventing the blade 40 from being stuck in the direct transmission.

[0070] Further, in the embodiment, the side of the rotating disc 11 facing the impeller center disc 20 is provided with a guide block 111, and the impeller center disc 20 is provided with a guide groove 21 corresponding to the guide block 111. The guide groove 21 is arranged along the circumferential direction of the impeller center disc 20 and has an inclined slope 3.

[0071] Specifically, the two side edges of the guide groove 21 have a stop edge, the groove bottom of the guide groove 21 has an inclined slope 3, the slope 3 is inclined from one end of the guide groove 21 to the other end, and is arranged along the circumferential direction of the impeller disc 20. The guide groove 21 is an arc-shaped groove, and the arc-shaped groove extends around the axial direction of the impeller disc 20. The guide block 111 can be a rectangular structure or other existing convex structure, such as an arc-shaped convex or a rod-shaped structure with a flat end. The guide block 111 protrudes from the rotating disc 11 towards the impeller disc 20 and is used for sliding connection in the guide groove 21. When the guide block 111 extends into the guide groove 21, when the rotating disc 11 moves along the axial direction of the self-adaptive impeller 100 through the driving part 2, the guide block 111 first contacts the end of the slope 3 in the guide groove 21 with a higher height. With the further approach of the rotating disc 11 to the impeller disc 20, the rotating disc 11 can rotate in the radial direction by means of the slope 3, and the torque of rotation is transmitted to the inlet end 41 of the blade 40 through the connecting assembly 12, thereby realizing the adjustment of the angle of the inlet end 41. Similarly, when the rotating disc 11 moves away from the impeller disc 20, the guide block 111 is gradually driven by the slope 3 in the guide groove 21, which can realize the reverse driving of the connecting assembly 12 to the blade 40 to adapt to the different working conditions of the impeller, and the adjustment of the angle of the inlet end 41 of the blade 40.

[0072] In another embodiment, the guide block 111 and the guide groove 21 both have an inclined slope 3, and the directions of the slopes 3 on the guide block 111 and the guide groove 21 are opposite.

[0073] Specifically, the guide block 111 and the guide groove 21 both have a slope 3. From the cross section, the guide block 111 is a wedge-shaped structure, and the groove bottom of the guide groove 21 also has a wedge-shaped structure. The inclination directions of the slopes 3 of the guide block 111 and the guide groove 21 are opposite, so that when the guide block 111 cooperates with the guide groove 21, the axial movement of the rotating disc 11 is converted into radial movement by increasing the slope 3, and the stability of the transmission torque is improved.

[0074] In this embodiment, the guide block 111 and the guide groove 21 are provided with a plurality of.

[0075] Specifically, the guide block 111 is provided with a plurality of along the circumferential direction of the rotating disc 11. This embodiment illustrates four guide blocks 111, but is not limited thereto. The guide groove 21 is correspondingly provided with four guide grooves. By increasing the number of guide blocks 111 and guide grooves 21, the guide blocks 111 and guide grooves 21 are arranged at different positions, which improves the stability of the rotating disc 11 rotating in the radial direction, and further ensures the stability of the inlet end 41 of the blade 40 when driving the change of the angle of the inlet end 41, thereby preventing the blade 40 from being stuck during high-speed rotation.

[0076] In the embodiment, the connecting assembly 12 comprises a first connecting piece 121 arranged along the axial direction of the adaptive impeller 100 and a second connecting piece 122 arranged along the radial direction of the adaptive impeller 100, the edge of the rotating disc 11 is provided with a mounting groove 4, one end of the first connecting piece 121 extends into the mounting groove 4, the other end of the first connecting piece 121 is connected with the second connecting piece 122, and the end of the second connecting piece 122 away from the first connecting piece 121 is provided with an opening, and the inlet end 41 of the blade 40 is clamped in the opening.

[0077] Specifically, the mounting groove 4 is arranged at the edge of the rotating disc 11 along the radial direction of the rotating disc 11, the first connecting piece 121 is a rod and is arranged along the axial direction of the adaptive impeller 100, and the second connecting piece 122 is a plate and is arranged along the radial direction of the adaptive impeller 100, that is, the first connecting piece 121 and the second connecting piece 122 are arranged perpendicularly, the second connecting piece 122 is provided with the opening, the inlet end 41 of the blade 40 extends into the opening and is connected with the second connecting piece 122, and the end of the first connecting piece 121 away from the second connecting piece 122 extends into the mounting groove 4, so that the position of the first connecting piece 121 in the mounting groove 4 remains unchanged when the rotating disc 11 moves axially, only the depth of the first connecting piece 121 extending into the mounting groove 4 changes, when the rotating disc 11 rotates along the radial direction through the guide block 111 and the guide groove 21, the rotating disc 11 rotates along the radial direction to drive the first connecting piece 121 to move in the mounting groove 4, so that the second connecting piece 122 moves along with the first connecting piece 121 and transmits the torque to the inlet end 41, thereby driving the inlet end 41 of the blade 40 to rotate.

[0078] It can be understood that the end of the second connecting piece 122 away from the first connecting piece 121 abuts against the edge of the impeller middle disc 20, and the second connecting piece 122 is limited along the axial direction of the adaptive impeller 100 by the impeller middle disc 20, thereby preventing the second connecting piece 122 from falling off.

[0079] In the embodiment, the transmission part 1 further comprises an elastic piece 13 arranged on the rotating disc 11 or the impeller middle disc 20 and between the rotating disc 11 and the impeller middle disc 20, and the elastic piece 13 is used to provide the elastic force of the rotating disc 11 away from the impeller middle disc 20.

[0080] Specifically, the elastic member 13 is a spring in the prior art, and the embodiment takes the spring fixedly connected to the side surface of the rotating disc 11 facing the impeller disc 20 as an example for description, but is not limited thereto. When the impeller gear position changes, the rotating speed of the blade 40 changes. When the rotating disc 11 moves towards the impeller disc 20 in the axial direction of the self-adaptive impeller 100, the spring is compressed, and at the same time, the rotating disc 11 drives the connecting assembly 12 to adjust the angle of the inlet end 41 of the blade 40. When the gear position changes again and the angle of the inlet end 41 of the blade 40 needs to be restored, the driving part 2 drives the transmission part 1 to move away from the impeller disc 20, so as to provide the elastic force of the rotating disc 11 moving away from the impeller disc 20 by the spring, so that the angle of the inlet end 41 can be adjusted in time, the response time is reduced, and the angle of the inlet end 41 of the blade 40 under different rotating speeds of the blade 40 under different gear positions of the impeller can be matched with the actual working condition.

[0081] In the embodiment, the driving part 2 comprises a driving motor 22 and a push rod 23 connected with the driving motor 22. When the driving part 2 is turned on, the push rod 23 is driven by the driving motor 22 and pushes the transmission part 1.

[0082] Specifically, the driving motor 22 is arranged on the fan bracket of the self-adaptive impeller 100 in the axial direction of the self-adaptive impeller 100. The driving motor 22 is a servo motor in the prior art. The servo motor is electrically connected with a control board. The output shaft of the driving motor 22 is connected with the push rod 23, so as to drive the push rod 23 to move the rotating disc 11 of the transmission part 1 in the axial direction by the driving motor 22, thereby realizing the conversion of the axial force into the radial movement by the rotating disc 11, and driving the angle of the inlet end 41 of the blade 40 to change.

[0083] It can be understood that the end of the push rod 23 away from the driving motor 22 has a pushing surface, and the size of the pushing surface is greater than the diameter of the push rod 23, so as to increase the contact area with the rotating disc 11, thereby improving the stability when the rotating disc 11 is pushed.

[0084] In the embodiment, the driving part 2 further comprises a lead screw 24. The output shaft of the driving motor 22 is connected with the lead screw 24. The lead screw 24 is screwed with the push rod 23, and the end of the push rod 23 away from the driving motor 22 is connected with the transmission part 1.

[0085] Specifically, the outer surface of the lead screw 24 has an external thread. The push rod 23 is provided with a threaded hole corresponding to the lead screw 24. The lead screw 24 is located between the push rod 23 and the driving motor 22 bracket. The push rod 23 and the lead screw 24 are coaxially arranged. The lead screw 24 is coaxially arranged with the output shaft of the driving motor 22, so as to drive the lead screw 24 to rotate by the output shaft, thereby driving the push rod 23 to move in the axial direction. By the screwing mode of the lead screw 24 and the push rod 23, the driving motor 22 drives the lead screw 24 to rotate, thereby ensuring the accuracy when the push rod 23 is driven, and also reflecting the accuracy when the transmission part 1 drives the blade 40 to rotate.

[0086] In the embodiment, the driving part 2 further comprises a guide rail 25 extending from the driving motor 22 towards the transmission part 1, and the lead screw 24 and the push rod 23 are located in the guide rail 25.

[0087] Specifically, the guide rail 25 is a track for accommodating a rod in the prior art, the guide rail 25 is arranged along the axial direction of the self-adaptive impeller 100 and extends from the driving motor 22 towards the rotating disc 11, and the push rod 23 and the lead screw 24 are located in the guide rail 25 to limit the axial direction of the push rod 23 and the lead screw 24, so as to avoid the deviation of the push rod 23 from the axial direction of the impeller when the push rod 23 is driven.

[0088] The embodiment further provides a range hood comprising the self-adaptive impeller described above, the self-adaptive impeller drives the inlet end 41 of the blade 40 to rotate to match the angle of the inlet end 41 of the blade 40 under different rotating speeds with the actual working condition, and the air volume sensor is used to turn on the driving part 2 to improve the automation degree of the impeller, the whole process of driving the blade 40 to rotate has high precision, and the blade 40 can be prevented from being stuck, and the use safety and convenience of the impeller and the range hood are improved.

[0089] Although the specific embodiments of the utility model are described above, those skilled in the art should understand that this is only an example, the protection scope of the utility model is defined by the appended claims. Those skilled in the art can make various changes or modifications to these embodiments without departing from the principles and essence of the utility model, but these changes and modifications all fall within the protection scope of the utility model.

Claims

1. An adaptive impeller comprising an upper impeller disc, a middle impeller disc, a lower impeller disc, and blades, characterized in that, The adaptive impeller further comprises: a transmission part located between the upper disc and the middle disc of the impeller, the transmission part rotates synchronously with the blades, and the transmission part is clamped with the inlet end of the blades; a driving part arranged in the axial direction of the adaptive impeller, the driving part is used to push the transmission part to move towards or away from the middle disc of the impeller in the axial direction of the adaptive impeller, when the transmission part moves towards or away from the middle disc of the impeller by the driving part, the transmission part rotates in the radial direction of the adaptive impeller and drives the angle of the inlet end of the blades to increase or decrease; an air volume sensor electrically connected with a control board, the control board is electrically connected with the driving part, when the air volume sensor detects that the air volume in the adaptive impeller is different from the corresponding impeller rotating speed, the air volume sensor turns on the driving part through the control board.

2. The self-adapting impeller of claim 1, wherein, The transmission part comprises a rotating disc and a connecting assembly, the radius of the rotating disc is smaller than the size from the inlet end of the blades to the axis of the adaptive impeller, and the connecting assembly is located between the edge of the rotating disc and the inlet end of the blades.

3. The self-adapting impeller of claim 2, wherein, The side of the rotating disc facing the middle disc of the impeller is provided with a guide block, the middle disc of the impeller is provided with a guide groove corresponding to the guide block, the guide groove is arranged in the circumferential direction of the middle disc of the impeller and has an inclined slope surface, or the guide block and the guide groove both have an inclined slope surface and the directions of the slope surfaces on the guide block and the guide groove are opposite.

4. The self-adapting impeller of claim 3, wherein, The guide block and the guide groove are provided with a plurality of guide blocks and guide grooves.

5. The self-adapting impeller of claim 2, wherein, The connecting assembly comprises a first connecting piece arranged in the axial direction of the adaptive impeller and a second connecting piece arranged in the radial direction of the adaptive impeller, the edge of the rotating disc is provided with a mounting groove, one end of the first connecting piece extends into the mounting groove, the other end of the first connecting piece is connected with the second connecting piece, the end of the second connecting piece away from the first connecting piece has an opening, and the inlet end of the blades is clamped in the opening.

6. The self-adapting impeller of claim 2, wherein, The transmission part further comprises an elastic member arranged on the rotating disc or the middle disc of the impeller and located between the rotating disc and the middle disc of the impeller, the elastic member is used to provide the elastic force of the rotating disc away from the middle disc of the impeller.

7. The self-adapting impeller of claim 1, wherein, The driving part comprises a driving motor and a push rod connected with the driving motor, when the driving part is turned on, the push rod is driven by the driving motor and pushes the transmission part.

8. The self-adapting impeller of claim 7, wherein, The driving part further comprises a lead screw, the output shaft of the driving motor is connected with the lead screw, the lead screw is screwed with the push rod, and the end of the push rod away from the driving motor is connected with the transmission part.

9. The self-adapting impeller of claim 8, wherein, The driving part further comprises a guide rail, the guide rail extends from the driving motor to the transmission part, and the lead screw and the push rod are located in the guide rail.

10. A range hood characterized by, The range hood comprises the adaptive impeller according to any one of claims 1-9.

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