CN114483655A

CN114483655A - Fan system and electric appliance

Info

Publication number: CN114483655A
Application number: CN202210204852.7A
Authority: CN
Inventors: 蒋婷婷; 冯国平; 刘俊龙; 刘亚琼; 陈金涛
Original assignee: Guangdong Welling Motor Manufacturing Co Ltd; Midea Welling Motor Technology Shanghai Co Ltd
Current assignee: Guangdong Welling Motor Manufacturing Co Ltd; Midea Welling Motor Technology Shanghai Co Ltd
Priority date: 2017-04-28
Filing date: 2017-04-28
Publication date: 2022-05-13
Also published as: CN107131154A; CN114483654A

Abstract

The invention relates to the technical field of power transmission, and discloses a fan system and an electric appliance. By utilizing the fan system provided by the invention, the air cover structure can be prevented from generating backflow, so that the pressure relief is prevented, and the efficiency of the system is improved.

Description

Fan system and electric appliance

Technical Field

The invention relates to the technical field of power transmission, in particular to a fan system and an electric appliance.

Background

The fan system is used for changing mechanical energy into gas pressure energy and kinetic energy, and generally, the fan system is a cavity which is formed by a fan cover and other parts and provided with an inlet and an outlet, the efficiency of the whole air path system is directly influenced by the design of a fan cover structure, and the fan cover structure in the existing structure can possibly generate large backflow to cause certain pressure relief, so that the conversion efficiency of the system is greatly reduced.

Disclosure of Invention

The invention aims to solve the problem that a fan cover structure of a fan system in the prior art can generate backflow, and provides the fan system which can prevent the backflow generated by the fan cover.

In order to achieve the above object, an aspect of the present invention provides a fan system, where the fan system includes a fan housing and a movable impeller, the fan housing has an air inlet and an annular groove disposed around the air inlet, the movable impeller includes a front cover plate, the front cover plate has a central through hole and is bent upward from outside to inside toward the central through hole, and a top of the front cover plate extends into the annular groove and maintains a gap with a sidewall of the annular groove.

Preferably, the movable impeller includes a back cover plate and a blade connected between the front cover plate and the back cover plate, the wind shield includes a top cover portion corresponding to a top surface of the front cover plate and a side wall portion corresponding to an edge of the blade, and the annular groove is provided on the top cover portion.

Preferably, the fan system includes a diffuser for diffusing, the diffuser including diffuser blades disposed radially outside the blades of the moving impeller.

Preferably, the top cover part includes a first portion corresponding to a front cover plate and a second portion corresponding to the diffuser, the first portion maintaining a gap of 0.2-1.5mm from a top surface of the front cover plate, the second portion having a curved surface part engaged with a top surface of the diffuser vane.

Preferably, the second portion includes a boss bent from the first portion in a direction axially away from the air inlet, the boss extending axially to a lowest position not lower than the bottom surface of the front cover plate.

Preferably, the junction of the first portion and the boss is a circular arc transition.

Preferably, the side wall portion is cylindrical and defines a hood outlet at a bottom of the side wall portion, and the air inlet and the hood outlet are coaxially arranged.

Preferably, the fan system comprises a driving device, the driving device comprises a housing and a driving mechanism installed in the housing and used for driving the movable impeller, and the housing is connected to the fan cover.

Preferably, the annular groove has a flow guiding structure therein for reducing backflow.

Preferably, the flow guide structure comprises at least one of sawteeth arranged on the inner side wall of the annular groove, a bending part which is arranged at the tail end of the inner side wall of the annular groove and is bent inwards in the radial direction, a baffle plate arranged in parallel with the side wall of the annular groove, and a labyrinth seal arranged on the top wall of the annular groove.

The invention also provides an electric appliance, wherein the electric appliance comprises the fan system.

Preferably, the electric appliance is a vacuum cleaner, a hand dryer, a fan, an air pump, an air cleaning device or a centrifugal pump.

Through the technical scheme, the fan cover is provided with the annular groove, and the top of the front cover plate of the movable impeller extends into the annular groove, so that gas backflow can be effectively prevented, and the pressure relief of a fan system is prevented.

Drawings

FIG. 1 is an exploded view of a fan system according to a preferred embodiment of the present invention;

FIG. 2 is an exploded view of the fan housing and other components of the blower system of FIG. 1 in an assembled state;

FIG. 3 is a schematic view of the impeller of FIG. 2;

FIG. 4 is a cross-sectional view of the hood of FIG. 2;

FIG. 5 is a cross-sectional view of the blower system of FIG. 1 in an assembled state;

FIG. 6 is an enlarged view at A in FIG. 5;

FIG. 7 is a schematic view of a preferred embodiment of the annular groove shown in FIG. 4;

FIG. 8 is a schematic view of another preferred embodiment of the annular groove shown in FIG. 4;

fig. 9 is a schematic view of yet another preferred embodiment of the annular groove shown in fig. 4.

Description of the reference numerals

10-a fan cover, 10 a-a top cover part, 10 b-a side wall part, 11-an air inlet, 12-an annular groove, 121-a bent part, 122-a baffle, 123-a labyrinth seal, 13-a first part, 14-a second part, 141-a boss, 20-a movable impeller, 21-a front cover plate, 22-a rear cover plate, 23-a blade, 30-a diffuser, 31-a diffuser blade, 40-a driving device, 41-a shell, 42-a stator component, 421-an annular main body part, 422-a mounting part, 43-a rotor component, 44-a rotor mounting part and 45-a connecting piece.

Detailed Description

In the present invention, unless otherwise specified, the use of directional terms such as "upper and lower" generally refer to the orientation of the drawing shown in FIG. 1, and "inner and outer" refer to the interior and exterior of the various components of the blower system shown in FIG. 1.

According to an aspect of the present invention, a fan system is provided, the fan system includes a fan housing 10 and an impeller 20, the fan housing 10 has an air inlet 11 and an annular groove 12 disposed around the air inlet 11, the impeller 20 includes a front cover plate 21, the front cover plate 21 has a central through hole and is bent upward from outside to inside toward the central through hole, and a top of the front cover plate 21 extends into the annular groove 12 and maintains a gap with a sidewall of the annular groove 12.

As shown in fig. 4 to 6, since the wind shield 10 provided by the present invention is provided with the annular groove 12, the top of the front cover plate 21 of the movable impeller 20 is inserted into the annular groove 12, so as to effectively prevent the backflow of the air, thereby preventing the pressure of the fan system from being released. Specifically, when the movable impeller 20 operates, air entering from the air inlet 11 of the fan housing 10 enters the impeller cavity of the movable impeller 20 from the central through hole and is stirred by the blades 23 to form an air flow. Meanwhile, the gas flowing back from the impeller cavity to the air inlet 11 is blocked by the annular groove 12 and returns to the impeller cavity, so that the gas is effectively prevented from flowing back, and the pressure relief of the fan system is prevented.

Wherein, the movable impeller 20 can rotate freely relative to the wind shield 10 because a gap is kept between the front cover plate 21 and the side wall of the annular groove 12. Further, as shown in fig. 3, the moving impeller 20 includes a front cover plate 21, a rear cover plate 22, and a blade 23. Wherein, the two sides of the blade 23 are respectively connected with the front cover plate 21 and the rear cover plate 22. When the movable impeller 20 works, air entering from the air inlet 11 of the fan cover 10 enters the impeller chamber of the movable impeller 20 from the central through hole and is stirred by the blades 23 to form an air flow flowing out from the gap between the blades 23.

The wind shield of the present invention may be of any suitable structure, and preferably, the wind shield 10 includes a top cover portion 10a corresponding to the top surface of the front cover plate 21 and side wall portions 10b corresponding to the edges of the blades 23, and the annular groove 12 is provided on the top cover portion 10 a.

In order to provide a diffuser effect, it is preferable that the fan system includes a diffuser 30 for diffusing, as shown in fig. 1, the diffuser 30 includes diffuser blades 31, and the diffuser blades 31 are radially disposed outside the blades 23 of the moving impeller 20. The diffuser blades 31 are arranged in the direction opposite to the direction in which the blades 23 of the movable impeller 20 are arranged, and when the fan system is operated, the movable impeller 20 rotates and the diffuser blades 31 are kept from rotating.

Referring to the structure shown in fig. 1 and 2, the cover dome section 10a includes the first section 13 corresponding to the front cover plate 21 and the second section 14 corresponding to the diffuser 30, and the first section 13 maintains a gap of 0.2 to 1.5mm from the top surface of the front cover plate 21. By minimizing the gap between the first portion 13 and the top surface of the front cover plate 21, on one hand, a gap can be provided between the first portion 13 and the top surface of the front cover plate 21 to allow the impeller 20 to rotate relative to the wind shield 10 without interfering with each other, and on the other hand, the fan system can be made compact, which is advantageous for product miniaturization. Wherein, preferably, the first portion 13 may be formed in a shape corresponding to the front cover 21 to facilitate assembly. In addition, the second portion 14 has a curved surface portion engaged with the top surface of the diffuser vane 31, thereby substantially forming a sealing structure between the cowl 10 and the diffuser 30 to prevent pressure release.

Preferably, the second portion 14 includes a boss 141 bent from the first portion 13 in a direction axially away from the tuyere, and the boss 141 axially extends to a lowest position not lower than the bottom surface of the front cover 21. Referring to the structure shown in fig. 4 and 6, the lowest position of the boss 141 is higher than the lowest position of the bottom surface of the front cover plate 21, so that a structure similar to a labyrinth is formed between the boss 141 and the front cover plate 21, which is not favorable for gas to flow from the gap between the first portion 13 and the top surface of the front cover plate 21 to the side wall of the wind shield 10, thereby enhancing the effect of suppressing the backflow.

It is also preferable that the connection between the first portion 13 and the boss 141 is a circular arc transition, so that the gap between the wind shield 10 and the impeller 20 is significantly reduced at a certain position or a certain section of the circular arc transition, thereby increasing the resistance to backflow.

The side wall of the wind shield 10 of the present invention may be selected to have a suitable structure to reduce wind resistance, and preferably, the side wall portion 10b is cylindrical and defines a wind shield outlet at the bottom of the side wall portion 10b, and the wind inlet 11 and the wind shield outlet are coaxially arranged. By providing the side wall portion 10b in a cylindrical shape, positioning connection with other cylindrical components downstream (e.g., the housing 41 below) is facilitated.

In order to further reduce the occurrence of backflow, it is preferable that the annular groove 12 has a flow guide structure therein for reducing backflow. Specifically, the flow guiding structure includes at least one of serrations provided on the inner sidewall of the annular groove 12, a bent portion 121 provided at an end of the inner sidewall of the annular groove 12 and bent radially inward, a baffle 122 provided adjacent to and parallel to the inner sidewall of the annular groove 12, and a labyrinth seal 123 provided on a top wall of the annular groove 12.

Referring to the structures shown in fig. 7 and 8, the bent portion 121 and the baffle 122 can stop the backflow gas and stop the backflow gas back to the impeller cavity; in addition, serrations (not shown) may be provided on inner sidewalls of both sides of the annular groove 12 to reduce backflow; further, it is also possible to enhance sealing by providing a plurality of seal teeth on the top wall of the annular groove 12 to form a labyrinth seal 123, thereby reducing backflow. It should be noted that, in the present invention, at least one of the bent portion 121, the baffle 122, the saw tooth and the labyrinth seal 123 may be selected, and any two, three or all of them may be selected, which are within the protection scope of the present invention. In addition, the baffle 122 may be an integral annular baffle surrounding the annular groove 12, or may be a plurality of arcuate baffles surrounding the annular groove 12.

The blower system provided by the present invention may be driven by an appropriate structure, and preferably, the blower system includes a driving device 40, the driving device 40 includes a housing 41 and a driving mechanism installed in the housing 41 for driving the movable impeller 20, and the housing 41 is connected to the wind shield 10. The driving device may be an electric motor, and referring to the structure shown in fig. 1, the driving mechanism includes a stator assembly 42 and a rotor assembly 43, and the movable impeller 20 is mounted on the rotor assembly 43 to rotate along with the rotor assembly 43. The diffuser blade 31 may be attached to the casing 41 of the driving device 40, or may be directly formed integrally with the casing 41.

The stator assembly 42 and rotor assembly 43 may be in various suitable forms and may be mounted within the housing 41 in various suitable ways. For example, the driving device 40 may include a rotor mounting portion 44 mounted inside the housing 41 and a connection member 45 connecting the rotor mounting portion 44 and the housing 41, the rotor assembly 43 may be mounted to the rotor mounting portion 44, and the stator assembly 42 may be mounted to the connection member 45.

The rotor assembly 43 may include a bearing and a rotor, wherein the bearing is mounted to the rotor mounting portion 44.

In addition, the stator assembly 42 may include an annular main body 421 and a mounting portion 422 protruding outward from an edge of the annular main body 421, the mounting portion 422 extends in an axial direction of the annular main body 421 and is connected to the connection member 45, and the mounting portion 422 is spaced apart from an inner wall of the housing 41. By providing the mounting portion 422 at a distance from the inner wall of the casing 41, an annular flow passage can be formed between the stator assembly 42 and the casing 41, and after the airflow generated by the impeller 20 enters the casing 41 along the side wall portion 10b, the airflow can flow through the annular flow passage along the inner wall of the casing 41 and provide a heat dissipation effect for each component of the stator assembly 42 and a component downstream of the annular flow passage.

In addition, according to another aspect of the invention, the invention also provides an electric appliance, which comprises the fan system. The electric appliance provided by the invention adopts the fan system, so that gas backflow can be effectively prevented, the electric appliance is prevented from being decompressed, and the efficiency of the electric appliance is improved.

Further, the electric appliance may be any device that generates pressure energy and kinetic energy of gas using the impeller, and preferably, the electric appliance is a vacuum cleaner, a hand dryer, a fan, an air pump, an air cleaning device, or a centrifugal pump.

The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, many simple modifications can be made to the technical solution of the invention. Including the combination of specific features in any suitable manner, the invention is not described in detail in order to avoid unnecessary repetition. Such simple modifications and combinations should be considered within the scope of the present disclosure as well.

Claims

1. A fan system is characterized by comprising a fan cover, a movable impeller and a diffuser for diffusing pressure; the fan cover is provided with an air inlet and an annular groove arranged around the air inlet; the movable impeller comprises a front cover plate, the front cover plate is provided with a central through hole and is bent upwards from outside to inside towards the central through hole, and the top of the front cover plate extends into the annular groove and keeps a gap with the side wall of the annular groove; the diffuser includes diffuser vanes; the fan housing comprises a top cover part corresponding to the top surface of the front cover plate, the top cover part comprises a first part and a second part, the first part corresponds to the front cover plate, a gap of 0.2-1.5mm is kept between the first part and the top surface of the front cover plate, and the second part is provided with a curved surface part.

2. The fan system of claim 1, wherein the movable impeller comprises a back cover plate and a blade connected between the front and back cover plates, the annular groove being disposed on the top cover portion.

3. The fan system of claim 2, wherein the diffuser blades are disposed radially outward of the blades.

4. The fan system of claim 1, wherein the second portion includes a boss bent from the first portion in a direction axially away from the inlet, the boss extending axially to a lowermost position no lower than a bottom surface of the front cover plate.

5. The fan system of claim 4, wherein a junction of the first portion and the boss is a circular arc transition.

6. The fan system of claim 1, wherein the fan housing further comprises a sidewall portion corresponding to an edge of the blade, the sidewall portion being cylindrical and defining a fan housing outlet at a bottom of the sidewall portion, the air inlet and the fan housing outlet being coaxially disposed.

7. The fan system of claim 1, comprising a drive device including a housing and a drive mechanism mounted within the housing for driving the impeller, the housing being connected to the shroud.

8. The fan system of any of claims 1-7, wherein the annular groove has a flow guide structure therein for reducing backflow.

9. The fan system of claim 8, wherein the flow directing structure comprises at least one of serrations disposed on an inner sidewall of the annular groove, a radially inwardly bent bend disposed at an end of the inner sidewall of the annular groove, a baffle disposed parallel to the sidewall of the annular groove, and a labyrinth seal disposed on a top wall of the annular groove.

10. An electrical appliance, characterized in that it comprises a fan system according to any one of claims 1-9.

11. The electrical appliance of claim 10, wherein the electrical appliance is a vacuum cleaner, a hand dryer, a fan, an air pump, an air cleaning device, or a centrifugal pump.