CN209860684U

CN209860684U - Heat radiation fan assembly

Info

Publication number: CN209860684U
Application number: CN201920959953.9U
Authority: CN
Inventors: 彭东琨
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-06-24
Filing date: 2019-06-24
Publication date: 2019-12-27
Anticipated expiration: 2029-06-24

Abstract

The utility model relates to a radiator fan assembly, this radiator fan assembly include installing support, oiliness bearing, enameled wire, driver chip, flabellum, permanent magnetism piece and pivot, the stator subassembly in installing support, oiliness bearing, enameled wire and the synthesis of driver chip, flabellum, permanent magnetism piece and pivot are constituteed into external rotor assembly to constitute a brushless DC motor fan assembly. The utility model has the advantages of simple installation, low cost, high production efficiency, low energy consumption, small noise, good fitting performance, high safety, stable operation and the like.

Description

Heat radiation fan assembly

Technical Field

The invention relates to a microwave oven, in particular to a radiating fan assembly of a microwave oven.

Background

Because the radiator fan of traditional microwave oven all adopts interchange shaded pole motor drive flabellum rotatory, the following defect of ubiquitous:

1. the shaded pole motor needs to be fixed on the mounting bracket by self-tapping screws, a self-tapping hole of a plastic piece is easy to slip, once the fan blade is pressed into the transmission shaft, if the fan blade or the shaded pole motor needs to be replaced, the transmission shaft and the fan blade of the shaded pole motor can be seriously damaged and deformed and cannot be used for the second time, so that inconvenience and cost loss increase are brought to subsequent work;

2. the fan blades, the mounting bracket, the shaded pole motor and the screws are purchased before the fan assembly is assembled by a microwave oven manufacturer, the parts are produced by different manufacturers, a large number of bin positions are occupied after materials return to the factory, the storage cost is increased, and meanwhile, the fan assembly is assembled by self, so the production cost is increased;

3. the shaded pole motor uses 220V mains supply, is close to the ventilation opening (the ventilation opening is made of metal materials), and has potential safety hazards of electric leakage;

4. the shaded pole motor has low output efficiency (10-20 percent), large volume, small output air quantity, high energy consumption and large noise;

5. the unit price of the shaded pole motor is high.

Disclosure of Invention

The invention discloses a cooling fan assembly, aiming at overcoming the defects existing in the prior similar products:

therefore, the invention adopts the following technical scheme:

a cooling fan assembly comprises an installation support, an oil bearing, an enameled wire, a driving chip, fan blades, permanent magnet pieces and a rotating shaft, wherein the installation support, the oil bearing, the enameled wire and the driving chip are combined into an inner stator component, and the fan blades, the permanent magnet pieces and the rotating shaft are combined into an outer rotor component to form a brushless direct current motor type fan assembly.

As a preferred scheme, a rear-open type iron core barrel is arranged in a frame opening of the mounting bracket, an iron core is arranged on the front end face of the iron core barrel, an axle hole is formed in the iron core, the oil-retaining bearing is arranged in the axle hole, the enameled wire is coated on the periphery of the iron core, and the driving chip is electrically connected to the enameled wire;

the fan blade comprises a rear-opening central cylinder and a plurality of fan blades circumferentially and annularly arranged on the outer wall of the central cylinder, the permanent magnet array is annularly arranged on the inner side wall of the central cylinder, the front end of the rotating shaft is fixedly inserted into a hole column arranged in the center of the inner cylinder wall of the central cylinder, and the rear end of the rotating shaft is movably inserted into the oil-containing bearing, so that the fan blade is rotatably connected to the mounting bracket, and the outer rotor assembly is further rotatably connected to the inner stator assembly.

Preferably, the opening of the mounting bracket is circular, and the core barrel is arranged in the center of the opening of the mounting bracket and fixedly connected to the mounting bracket through spokes arranged on the periphery of the core barrel.

Preferably, the iron core cylinder, the iron core and the mounting bracket are integrally formed.

Preferably, the driving chip is fixed on a fixing plate arranged on the outer wall of the mounting bracket.

Preferably, the fan blades are enclosed within the mounting bracket.

Preferably, the rear end of the rotating shaft penetrates through the oil-retaining bearing and then is exposed out of the iron core cylinder, a clamping groove is formed in the rear end of the rotating shaft, and a split retainer ring used for locking the rotating shaft to the iron core cylinder to prevent the fan blades from loosening and swinging is clamped in the clamping groove.

The invention adopts the brushless direct current motor to drive the fan blades to rotate, and has the following advantages compared with the traditional microwave oven cooling fan:

1. the outer rotor assembly taking the fan blade as a main body is connected with the inner stator assembly taking the mounting bracket as a main body in an interference fit mode, and the two assemblies are fixed in a mode that a rotating shaft at the rear end of the fan blade penetrates through an oil-containing bearing on the mounting bracket and then is clamped into a clamping groove at the front end of the rotating shaft by using an open retainer ring so as to prevent the fan blade from loosening and swinging when the motor works;

2. only the fan assembly is purchased by a manufacturer for producing the microwave oven, so that the storage cost is greatly reduced, and the fan assembly does not need to be assembled automatically, so that the production cost is effectively reduced;

3. the brushless direct current motor uses DC12V safe voltage, so that the potential leakage hazard is completely avoided, and the occurrence of the leakage accident is avoided;

4. the brushless direct current motor has high output efficiency (improved to 40-50 percent), small volume, large output air quantity, low energy consumption, low noise and stable rotation;

5. the unit price of the brushless direct current motor is lower than that of a shaded pole motor with the same performance.

Drawings

FIG. 1 is a schematic diagram of an embodiment of the present invention;

FIG. 2 is a longitudinal sectional view of the overall structure of an embodiment of the present invention;

FIG. 3 is an exploded view of the overall structure of an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of an inner stator assembly according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of an outer rotor assembly according to an embodiment of the present invention.

Detailed Description

The invention is described below with reference to the accompanying drawings and specific embodiments.

Referring to FIGS. 1-5:

a cooling fan assembly comprises an inner stator assembly 01 and an outer rotor assembly 02, wherein the inner stator assembly 01 comprises an installation support 1, an oil bearing 2, an enameled wire 3 and a driving chip 4, and the outer rotor assembly 02 comprises fan blades 5, permanent magnet sheets 6 and a rotating shaft 7.

The mounting bracket 1 is provided with a circular bracket opening, the center of the bracket opening is provided with a rear open type iron core cylinder 101, the iron core cylinder 101 is fixedly connected to the mounting bracket 1 through spokes 1011 arranged on the periphery of the iron core cylinder 101, the bottom of the outer cylinder of the iron core cylinder 101 is vertically provided with an iron core 1012, and the mounting bracket 1, the iron core cylinder 101 and the iron core 1011 are integrally formed. The iron core 1012 is internally provided with a shaft hole communicated with the cavity of the iron core barrel 101, the oil-retaining bearing 2 is arranged in the shaft hole, the enameled wire 3 is coated on the periphery of the iron core 1012, and the driving chip 4 is fixed on the fixing plate 102 fixed on the outer wall of the mounting bracket 1 and electrically connected to the enameled wire 3. 4

The fan blade 5 comprises a rear-opening central cylinder 501 and a plurality of fan blades 502 circumferentially and annularly arranged on the outer wall of the central cylinder 501, the permanent magnet blades 6 are annularly arranged on the inner cylinder wall of the central cylinder 501 in an array mode, and the front end of the rotating shaft 7 is fixedly inserted into a hole column 5011 arranged in the center of the inner cylinder wall of the central cylinder 501 in an inserting mode.

The rear end of the rotating shaft 7 penetrates through the oil-retaining bearing 3 and then is exposed in the iron core cylinder 101, the clamping groove arranged at the rear end part of the rotating shaft 7 is clamped into the split retainer ring 8, the rotating shaft 7 can be locked in the iron core cylinder 101 to prevent the fan blades 5 from loosening and swinging, at the moment, the permanent magnet sheets 6 are wound around the periphery of the enameled wire 3 at intervals, so that the fan blades 5 are arranged in the opening of the bracket 1 and are rotatably connected to the mounting bracket 1 in an interference fit mode, and meanwhile, the outer rotor component 02 is rotatably connected to the inner stator component 01 to form a brushless direct current motor fan assembly.

When the fan blade type enameled wire winding machine works, the driving chip 4 sequentially switches on power supplies of coils of all phases of the enameled wire 3, so that a magnetic field with the direction changing uniformly is formed, and the rotating shaft 7 is driven by the magnetic field to rotate so as to drive the fan blades 5 to rotate.

Claims

1. A cooling fan assembly, its characterized in that: the fan blade, the permanent magnet pieces and the rotating shaft are combined into an outer rotor component to form a brushless direct current motor type fan assembly.

2. The heat dissipation fan assembly as claimed in claim 1, wherein: a rear-opening iron core barrel is arranged in a frame opening of the mounting bracket, an iron core is arranged on the front end face of the iron core barrel, an axle hole is formed in the iron core, the oil-containing bearing is arranged in the axle hole, the enameled wire is coated on the periphery of the iron core, and the driving chip is electrically connected to the enameled wire;

3. The heat dissipation fan assembly as claimed in claim 2, wherein: the frame opening of the mounting bracket is circular, and the iron core cylinder is arranged in the center of the frame opening of the mounting bracket and is fixedly connected to the mounting bracket through spokes arranged on the periphery of the iron core cylinder.

4. The heat dissipation fan assembly as claimed in claim 2, wherein: the iron core cylinder, the iron core and the mounting bracket are integrally formed.

5. The heat dissipation fan assembly as claimed in claim 2, wherein: the driving chip is fixed on a fixing plate arranged on the outer wall of the mounting bracket.

6. The heat dissipation fan assembly as claimed in claim 2, wherein: the fan blades are enclosed in the mounting bracket.

7. The heat dissipation fan assembly as claimed in claim 2, wherein: the rear end of the rotating shaft penetrates through the oil-retaining bearing and then is exposed out of the iron core cylinder, a clamping groove is formed in the rear end of the rotating shaft, and a split retainer ring used for locking the rotating shaft to the iron core cylinder to prevent the fan blades from loosening and swinging is clamped in the clamping groove.