CN2519860Y

CN2519860Y - Fan for radiation

Info

Publication number: CN2519860Y
Application number: CN 02201250
Authority: CN
Inventors: 陈建荣; 刘智光
Original assignee: Yen Sun Technology Corp
Current assignee: Yen Sun Technology Corp
Priority date: 2002-01-10
Filing date: 2002-01-10
Publication date: 2002-11-06
Anticipated expiration: 2012-01-10

Abstract

An exhaust fan comprises a frame, a base arranged at the bottom of the frame, a stator coil arranged on the base, a rotation axis hinged on the stator coil, a fan wheel arranged on the rotation axis and a circuit board arranged between the stator coil and the base. The fan wheel is provided with an induction magnet ring which mutually induces with the stator coil. A position on the base corresponding to the center of the rotation axis is provided with a magnetic supporter which supports the bottom of the rotation axis. The utility model can keep the rotation balance of the fan wheel and increase the smoothness of starting and running.

Description

Radiation fan

[technical field]

The utility model relates to a kind of radiation fan.

[background technique]

General small-sized heat radiating fan is in order to reduce the axial vibrations that is produced when impeller rotates, balance and stability more when impeller is rotated, as shown in Figure 1, and between the circuit board 10 of fan 1 and stator coil 12, set up a sense magnetic tinsel 14, magnetic force so as to the inductive magnetic ring 18 in the induction impeller 16, can be drop-down when impeller 16 is rotated by this induced magnetism, and reach aforementioned balance and stability effect when keeping impeller 16 and rotating, or as shown in Figure 2, be arranged at top in the impeller 22 and will feel magnetic tinsel 20, can reach the magnetic force of the inductive magnetic ring 24 in the induction impeller 22 equally, reach the more effect of balance and stability when impeller 22 is rotated.

Above-mentioned general radiation fan 1,2 is when reality is used, and having following missing values must improve:

(1) inrush current height and moment of torsion are required great effort greatly:

General radiation fan 1,2 is owing to borrow the whole inductive magnetic ring of feeling in magnetic tinsel 14, the 20

surface induction impellers

16,22 18,24, therefore the magnetic attraction that is produced between the two is bigger, when causing

stator coil

12,26 to desire energization excitation with 16,22 rotations of startup impeller, also must remove to overcome aforesaid magnetic attraction, can make

impeller

16,22 start rotation, the inrush current that so will cause being energized in the

stator coil

12,26 must be quite high, the starting torque of

impeller

16,22 also increases relatively simultaneously, causes general radiation fan 1,2 quite to require great effort when starting.

(2) rotating speed can't effectively promote:

Because general radiation fan 1,2 must overcome the magnetic attraction between sense

magnetic tinsel

14,20 and the inductive

magnetic ring

18,24 when starting, and comparatively require great effort when causing starting, therefore be activated and after the entry into service when

impeller

16,22,

impeller

16,22 integral body still can be attracted by aforesaid magnetic attraction, and cause in the part that promotes rotating speed comparatively limited and can't effectively promote.

[model utility content]

The purpose of this utility model is to be to provide a kind of radiation fan, it can effectively be reached keep the impeller rotary balance, increases the effects such as smoothness that start and turn round.

In order to achieve the above object, the utility model provides a kind of radiation fan, comprising pedestal, that a framework, is arranged at this framework bottom is arranged at stator coil, on this pedestal and is hubbed at rotatingshaft, on this stator coil and is fixedly arranged on impeller and on this rotatingshaft and is arranged at circuit board between this stator coil and this pedestal, be provided with the inductive magnetic ring that interacts with this stator coil in this impeller, it is characterized in that:

To being provided with a magnetic supporter in the rotatingshaft central position, on the magnetic supporter, be supported rotation on this pedestal for the rotatingshaft bottom.

Described radiation fan is characterized in that: this pedestal is provided with the central siphon that a bottom is closed shape, is equipped with bearing in this central siphon, be placed through in the bearing for rotatingshaft, and the magnetic supporter promptly is arranged on the central siphon bottom surface.

Described radiation fan is characterized in that: this pedestal is provided with the central siphon that a bottom is open shape, is equipped with bearing in this central siphon, be placed through in the bearing for rotatingshaft, and the magnetic supporter promptly seals and is arranged at the central siphon bottom.

Described radiation fan is characterized in that: this magnetic supporter surface depression is provided with an arc recess, the then corresponding pushing and drawing shape that forms convergent in this rotatingshaft bottom.

Described radiation fan is characterized in that: this magnetic supporter is a permanent magnet.

By above-mentioned explanation, and the utility model is done one relatively with general, when learning advantage and the effect that the utlity model has what follows:

(1) startup is comparatively smooth and easy:

The utility model is provided with a magnetic supporter by corresponding rotatingshaft center position on pedestal, on the magnetic supporter, be supported rotation for the rotatingshaft bottom, therefore can be drop-down by the magnetic attraction rotatingshaft of this magnetic supporter, can be drop-down when making that impeller rotates by this induced magnetism, except having the balanced action of keeping the impeller rotation, more only attract rotatingshaft separately but not attract inductive magnetic ring in the impeller by the magnetic force of this magnetic supporter, make the inrush current when the whole impeller of startup rotates to reduce relatively, starting torque also can reduce simultaneously, and increases the smoothness that starts.

(2) can effectively promote rotating speed:

Inductive magnetic ring because the magnetic force of magnetic supporter of the present utility model only attracts rotatingshaft separately in the attraction impeller, so the magnetic attraction that this impeller need overcome when being activated rotation diminishes relatively, so the rotating speed when impeller of the present utility model rotates can improve in comparison relatively with general radiation fan, and effectively reaches the effect that promotes rotating speed.

Below by preferred embodiment and accompanying drawing radiation fan of the present utility model is elaborated:

[description of drawings]

Shown in Figure 1 is the combination cross-sectional schematic of radiation fan in the past.

Shown in Figure 2 is the another kind of combination cross-sectional schematic of radiation fan in the past.

Shown in Figure 3 is the combination cross-sectional schematic of the utility model one preferred embodiment.

Shown in Figure 4 is the combination cross-sectional schematic of another preferred embodiment of the utility model.

[embodiment]

As shown in Figure 3, the radiation fan 3 that present embodiment is shown, it mainly is to include a framework 30, one is arranged at the pedestal 31 of framework 30 bottoms, one is arranged at the stator coil 32 on the pedestal 31, one is hubbed at the rotatingshaft 33 on the stator coil 32, one is fixedly arranged on the impeller 34 on the rotatingshaft 33, an and circuit board 35 that is arranged at 31 of stator coil 32 and pedestals, be provided with the inductive magnetic ring 36 that interacts with this stator coil 32 in this impeller 34, particularly, corresponding rotatingshaft 33 central positions are provided with a magnetic supporter 37 on this pedestal 31, on magnetic supporter 37, be supported rotation for rotatingshaft 33 bottoms, moreover, this pedestal 31 is provided with the central siphon 38 that a bottom is closed shape, be equipped with bearing 39 in this central siphon 38, be placed through in the bearing 39 for rotatingshaft 33, and aforementioned magnetic supporter 37 promptly is arranged on central siphon 38 bottom surfaces, in addition, this magnetic supporter 37 is a permanent magnet.

As shown in Figure 3, present embodiment produces when excitatory in being energized to stator coil 32, promptly with impeller 34 in inductive magnetic ring 36 interact and produce magnetic force and make impeller 34 rotations, this moment is because rotatingshaft 33 is supported rotation by magnetic supporter 37, therefore the magnetic force that this rotatingshaft 33 can induced magnetism supporter 37, and can be drop-down by this induced magnetism when whole impeller 34 is rotated, and reach the effect of keeping impeller 34 rotary balances, simultaneously, because the magnetic force that the magnetic supporter 37 of present embodiment is produced is only at rotatingshaft 33 do attractions but not at the inductive magnetic ring 36 in the impeller 34, so the magnetic attraction that this impeller 34 need overcome when being activated rotation diminishes relatively, so inrush current and starting torque also can reduce relatively, and make startup comparatively laborsaving and the running also comparatively smooth and easy.

As shown in Figure 4, the radiation fan 4 that present embodiment is shown, its structure is roughly the same with last embodiment, be as for its difference, central siphon 48 bottoms on this pedestal 41 are open shape, and 47 sealings of magnetic supporter are arranged at this central siphon 48 bottoms, and these magnetic supporter 47 surface depressions are provided with an arc recess 470, the then corresponding pushing and drawing shape that forms convergent in these rotatingshaft 43 bottoms, therefore, when the impeller 44 of present embodiment rotates, can reach identical with last embodiment impeller 44 rotary balances of keeping except same, increase outside the effects such as smoothness that start and turn round, another different enforcement structure more can be provided.

Claims

1. radiation fan, comprising pedestal, that a framework, is arranged at this framework bottom is arranged at stator coil, on this pedestal and is hubbed at rotatingshaft, on this stator coil and is fixedly arranged on impeller and on this rotatingshaft and is arranged at circuit board between this stator coil and this pedestal, be provided with the inductive magnetic ring that interacts with this stator coil in this impeller, it is characterized in that:

To being provided with a magnetic supporter in the rotatingshaft central position, this magnetic support member is in this rotatingshaft bottom on this pedestal.

2. radiation fan as claimed in claim 1 is characterized in that: this pedestal is provided with the central siphon that a bottom is closed shape, is equipped with bearing in this central siphon, and this rotatingshaft is placed through in this bearing, and this magnetic supporter is arranged on this central siphon bottom surface.

3. radiation fan as claimed in claim 1 is characterized in that: this pedestal is provided with the central siphon that a bottom is open shape, is equipped with bearing in this central siphon, and this rotatingshaft is placed through in this bearing, and this magnetic supporter is that sealing is arranged at this central siphon bottom.

4. radiation fan as claimed in claim 1 is characterized in that: this magnetic supporter surface depression is provided with an arc recess, and this rotatingshaft bottom is then to should arc recess being arranged to the pushing and drawing shape of convergent.

5. radiation fan as claimed in claim 1 is characterized in that: this magnetic supporter is a permanent magnet.