CN220956107U

CN220956107U - Fan system and range hood with same

Info

Publication number: CN220956107U
Application number: CN202322626693.2U
Authority: CN
Inventors: 何立博
Original assignee: Ningbo Fotile Kitchen Ware Co Ltd
Current assignee: Ningbo Fotile Kitchen Ware Co Ltd
Priority date: 2023-09-26
Filing date: 2023-09-26
Publication date: 2024-05-14
Anticipated expiration: 2033-09-26

Abstract

The utility model discloses a fan system and a range hood with the fan system, wherein the fan system comprises an impeller, a motor for driving the impeller to rotate and a screwing nut for connecting the impeller with the motor, the impeller comprises a wheel disc, the motor comprises an output shaft, the screwing nut comprises a connecting part, and the output shaft penetrates through the wheel disc along the axial direction of the impeller and penetrates into the connecting part to be fixed with the screwing nut; the end face of the connecting part, which faces one side of the wheel disc, is a first matching surface, the end face of the wheel disc, which faces one side of the screwing nut, is a second matching surface, and an included angle is formed between the first matching surface and the second matching surface to form partial contact inclined matching.

Description

Fan system and range hood with same

Technical Field

The utility model relates to a power device, in particular to a fan system and a range hood using the fan system.

Background

The kitchen ventilator is used as an indispensable kitchen appliance of every family, and has the functions of sucking oil smoke from an air inlet through an impeller rotating at a high speed in a volute, filtering the oil smoke by the impeller, and discharging the filtered oil smoke from an air outlet so as to finish the purification work of kitchen air.

The utility model patent of China with the application number 202220245829.8 discloses a centrifugal fan, which comprises a volute, an impeller and a motor, wherein the volute comprises a first side plate, a second side plate and a ring wall, the first side plate and the second side plate are opposite in front and back and are arranged at intervals, the ring wall is connected between the first side plate and the second side plate, the impeller is arranged in the volute, the impeller comprises a middle plate and a wheel disc connected with the middle plate, the motor is arranged on the first side plate or the second side plate through a fixed bracket, and an output shaft of the motor is in transmission connection with the impeller; the motor is a bidirectional motor with an output shaft capable of rotating forward and backward, the centrifugal fan further comprises a lock nut, and the output shaft of the motor penetrates through a fixed shaft sleeve of the wheel disc to be connected with the lock nut.

The motor shaft of traditional range hood passes through impeller wheel hub with the impeller and is connected, and the reuse screws the nut and screws up (for convenient dismouting service, range hood generally adopts the special-shaped nut that the workman can hand screw up), and the impeller is stained with greasy dirt after using a period, and dynamic balance variation, vibration, impact etc. increase can influence the reliability of screwing the nut connection, appears screwing the nut and becomes flexible even, drops, causes the trouble easily. In particular to a range hood with a part of forward and reverse cleaning functions, which is more easy to loose.

Disclosure of utility model

The first technical problem to be solved by the utility model is to provide a fan system capable of preventing the screw nut from loosening, aiming at the defects existing in the prior art.

The second technical problem to be solved by the utility model is to provide a range hood with the fan system.

The technical scheme adopted by the utility model for solving the first technical problem is as follows: the fan system comprises an impeller, a motor for driving the impeller to rotate and a screwing nut for connecting the impeller with the motor, wherein the impeller comprises a wheel disc, the motor comprises an output shaft, the screwing nut comprises a connecting part, and the output shaft penetrates through the wheel disc along the axial direction of the impeller and penetrates into the connecting part to be fixed with the screwing nut; the method is characterized in that:

The end face of the connecting part, which faces one side of the wheel disc, is a first matching surface, the end face of the wheel disc, which faces one side of the screwing nut, is a second matching surface, and an included angle is formed between the first matching surface and the second matching surface to form partial contact inclined matching.

Through making to screw and adopt inclined plane cooperation between nut and the rim plate, can make the pressure center of mating surface deviate from geometric center, produce the additional moment of bending to the output shaft of motor, increase axial pretightning force, on the other hand make the bearing of all engaged screw thread teeth tend to even, the tooth that this cooperation bears the weight of the screw thread increases, further increase friction surface, produce positive influence to improving locking performance, realize preventing the pine taking off under the prerequisite of not changing the operation habit, make things convenient for no special instrument quick assembly disassembly, can adapt to the self-cleaning function of continuous corotation, the wholeness is good, need not to increase auxiliary parts spare parts such as extra bullet pad, round pin secondary locking.

Further, for the fixation of the nut of being convenient for screw and output shaft, be formed with the connecting hole in the connecting portion, screw the nut and still including inlaying the embedded nut of locating in the connecting hole, output shaft and embedded nut threaded connection.

Further, an included angle is formed between the embedded nut and the axis of the connecting hole, so that the screwed nut is obliquely matched with the contact end face of the wheel disc after the threads are screwed.

Further, a notch is formed in the peripheral wall of the embedded nut, so that the embedded nut can generate elastic deformation and is matched with an additional bending moment, on one hand, the axial pretightening force is increased, and in addition, the additional load enables the nut threads on the side of the side notch to generate eccentric wedging force to be further loose-proof.

Further, an inner thread in threaded connection with the output shaft is formed on the inner peripheral wall of the embedded nut, the surface of the inner thread is provided with saw teeth, and compared with the common tooth shape, the concave-convex matching surface of the thread surface has the anti-loosening capability of inhibiting local sliding.

Further, the outer circumference of the embedded nut is formed with a toothed protrusion, which is embedded into the wall surface of the connecting portion at the outer circumference of the connecting hole, thereby preventing the internal thread from rotating so as to carry torque.

Further, in order to facilitate manual operation of the tightening nut, the tightening nut further includes a manual tightening operation portion located at the outer periphery of the connecting portion.

Preferably, the wheel disc comprises a disc body and a connecting shaft part protruding from the disc body towards the direction of screwing the nut, and the second matching surface is an end surface of the connecting shaft part.

The utility model solves the second technical problem by adopting the technical proposal that: a range hood, characterized in that: a fan system as described above is applied.

Preferably, the fan system is a centrifugal fan, the fan system further comprises a volute, and the impeller is arranged in the volute.

Compared with the prior art, the utility model has the advantages that: through making to screw and adopt inclined plane cooperation between nut and the rim plate, can make the pressure center of mating surface deviate from geometric center, produce the additional moment of bending to the output shaft of motor, increase axial pretightning force, on the other hand make the bearing of all engaged screw thread teeth tend to even, the tooth that this cooperation bears the weight of the screw thread increases, further increase friction surface, produce positive influence to improving locking performance, realize preventing the pine taking off under the prerequisite of not changing the operation habit, make things convenient for no special instrument quick assembly disassembly, can adapt to the self-cleaning function of continuous corotation, the wholeness is good, need not to increase auxiliary parts spare parts such as extra bullet pad, round pin secondary locking.

Drawings

FIG. 1 is a schematic diagram of a fan system according to an embodiment of the present utility model;

FIG. 2 is a cross-sectional view of a fan system according to an embodiment of the present utility model;

FIG. 3 is a schematic view of the installation of a motor, wheel and tightening nut of a fan system according to an embodiment of the present utility model;

FIG. 4 is a schematic diagram of an exploded view of a motor, wheel and tightening nut of a fan system according to an embodiment of the present utility model;

FIG. 5 is a schematic view of an exploded view of the motor, wheel and tightening nut of the fan system (from a different perspective than FIG. 4) according to an embodiment of the present utility model;

FIG. 6 is a cross-sectional view of a motor, wheel and tightening nut of a fan system according to an embodiment of the present utility model;

FIG. 7 is an enlarged partial schematic view of FIG. 6;

FIG. 8 is a schematic view of an in-line nut of a fan system according to an embodiment of the present utility model.

Detailed Description

The utility model is described in further detail below with reference to the embodiments of the drawings.

In the description of the present utility model, 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", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for purposes of describing the present utility model and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and because the disclosed embodiments of the present utility model may be arranged in different orientations, these directional terms are merely for illustration and should not be construed as limitations, such as "upper", "lower" are not necessarily limited to orientations opposite or coincident with the direction of gravity. Furthermore, features defining "first", "second" may include one or more such features, either explicitly or implicitly.

Referring to fig. 1 to 6, a fan system, in this embodiment, a centrifugal fan, or other types of fans that require a motor and an impeller to be fixed by screwing nuts. The centrifugal fan is mainly used in a range hood, and can be used for replacing the range hood and other occasions needing the power device.

The fan system comprises a volute 1, an impeller 2 arranged in the volute 1, a motor 3 for driving the impeller 2 to rotate and a screwing nut 4.

The impeller 2 includes a first end ring 21, a second end ring 22, and a plurality of blades 23 disposed between the first end ring 21 and the second end ring 22, the blades 23 being arranged at intervals along the circumferential direction of the first end ring 21 (the second end ring 22). The impeller 2 further comprises a wheel disc 24 for mounting the motor 3, which may be integral with the second end ring 22 (single air intake impeller) or fixed with a central disc 25 (double air intake impeller), the construction being the same as in the prior art.

The motor 3 includes a motor body 31 and an output shaft 32, the motor body 31 being located at one side of the wheel disc 24, the output shaft 32 passing through the wheel disc 24 in the axial direction of the impeller 2 and being connected to the wheel disc 24 by screwing the nut 4.

The wheel 24 includes a disk body 241 and a connecting shaft portion 242 protruding from the middle of the disk body 241 in the direction of tightening the nut 4. The tightening nut 4 includes a tightening nut body 41 configured as a conventional hand tightening nut and an embedded nut 42 provided in the tightening nut body 41, and the tightening nut body 41 is typically a die cast or plastic member. Tightening the nut 4 secures the output shaft 31 of the motor 3 with the connecting shaft portion 242 of the wheel disc 24 of the impeller 2. The output shaft 32 is provided with a linear pin 33, a matched groove 243 is formed on one side, facing the motor body 31, of the disc body 241 of the wheel disc 24, and in the connection state, the pin 33 is clamped into the groove 243, so that the motor 3 and the impeller 2 can be prevented from rotating relatively.

The tightening nut body 41 includes a connecting portion 411 and a tightening operation portion 412 located at an outer periphery of the connecting portion 411, wherein the connecting portion 411 is hollow, and is open toward one side of the wheel disc 24, and the embedded nut 42 is embedded in the connecting portion 411. The end surface of the connecting portion 411 facing the side of the wheel disc 24 is a first mating surface 4111, the end surface of the connecting shaft portion 242 of the wheel disc 24 facing the side of the screw nut 4 is a second mating surface 2421, and the first mating surface 4111 and the second mating surface 2421 are in a non-tightly fit state, but have a certain included angle, so that partial contact inclined fit is formed.

The connection portion 411 has a connection hole 4112 formed therein, and the embedded nut 42 is embedded in the connection hole 4112, see fig. 8. The protrusion 421 is formed on the outer circumference of the insert nut 42, and the protrusion 421 is inserted into a wall surface of the connecting portion 411 located on the outer circumference of the connecting hole 4112 (a groove corresponding to the protrusion 421 is formed on the wall surface), thereby preventing the insert nut 42 from rotating and thus bearing torque. The peripheral wall of the embedded nut 42 is preferably provided with a notch 422 in the peripheral wall of the middle upper part (the part further away from the wheel disc 24) of the embedded nut 42, so that the whole embedded nut 42 is elastic and can be elastically deformed to a certain extent when being pressed, the axial pretightening force can be increased, the eccentric wedging force is generated, and the locking can be further realized. The end of the output shaft 32 penetrates into the connection hole 4112 and is screwed with the embedded nut 42.

The two matching surfaces directly form inclined matching, alternatively, the two matching surfaces can also be: an included angle is formed between the embedded nut 42 and the connecting hole 4112, that is, the axes of the embedded nut 42 and the connecting hole 4112 do not coincide, so that the first mating surface 4111 of the connecting portion 411 and the second mating surface 2421 of the wheel disc 24 form an inclined fit after the embedded nut 42 and the output shaft 32 are screwed tightly.

The sloped surfaces of the first and second mating surfaces 2421, 2421 mate such that the center of pressure of the second mating surface 2421 is offset from the geometric center, creating additional bending moments on the output shaft 32. At the same time, the combined action of the additional bending moment and the elastic deformation of the embedded nut 42 increases the axial pretightening force on one hand, and makes the bearing among all engaged threads tend to be uniform on the other hand, and compared with a standard nut, the bearing acting forces of the first two circles of threads have obvious difference. The teeth of the matched bearing threads are increased, so that the friction surface is further increased, and positive influence is brought to the improvement of the anti-loosening performance.

As described above, the female nut 42 is screwed to the output shaft 32, and therefore, the female screw 423 is formed on the inner peripheral wall of the female screw 42, the surface of the female screw 423 is provided with the serrations 4231, and the serrations 4231 may be rectangular or triangular, thereby forming a concave-convex surface, and the threaded surface is a concave-convex mating surface, compared with a general tooth shape, having a locking ability to suppress local slippage.

Claims

1. A fan system, comprising an impeller (2), a motor (3) for driving the impeller (2) to rotate and a screwing nut (4) for connecting the impeller (2) and the motor (3), wherein the impeller (2) comprises a wheel disc (24), the motor (3) comprises an output shaft (32), the screwing nut (4) comprises a connecting part (411), and the output shaft (32) penetrates into the connecting part (411) along the axial direction of the impeller (2) through the wheel disc (24) to be fixed with the screwing nut (4); the method is characterized in that:

the end face of the connecting part (411) facing to one side of the wheel disc (24) is a first matching surface (4111), the end face of the wheel disc (24) facing to one side of the screwing nut (4) is a second matching surface (2421), and an included angle is formed between the first matching surface (4111) and the second matching surface (2421) to form partial contact inclined matching.

2. The fan system of claim 1, wherein: the connecting part (411) is internally provided with a connecting hole (4112), the screwing nut (4) further comprises an embedded nut (42) embedded in the connecting hole (4112), and the output shaft (32) is in threaded connection with the embedded nut (42).

3. The blower system of claim 2, wherein: an included angle is formed between the embedded nut (42) and the axis of the connecting hole (4112).

4. The blower system of claim 2, wherein: a cutout (422) is formed in the peripheral wall of the embedded nut (42).

5. The blower system of claim 2, wherein: an inner thread (423) in threaded connection with the output shaft (32) is formed on the inner peripheral wall of the embedded nut (42), and saw teeth (4231) are formed on the surface of the inner thread (423).

6. The blower system of claim 2, wherein: the periphery of the embedded nut (42) is provided with tooth-shaped bulges (421), and the bulges (421) are embedded into the wall surface of the connecting part (411) positioned at the periphery of the connecting hole (4112).

7. The fan system according to any one of claims 1-6, wherein: the screwing nut (4) further comprises a hand tightening operation part (412) positioned at the periphery of the connecting part (411).

8. The fan system according to any one of claims 1-6, wherein: the wheel disc (24) comprises a disc body (241), a connecting shaft portion (242) protruding from the disc body (241) towards the direction of screwing the nut (4), and the second matching surface (2421) is an end face of the connecting shaft portion (242).

9. A range hood, characterized in that: use of a fan system according to any of claims 1-8.

10. The range hood of claim 9, wherein: the fan system is a centrifugal fan and further comprises a volute (1), and the impeller (2) is arranged in the volute (1).