CN2198709Y

CN2198709Y - DC radiation fan

Info

Publication number: CN2198709Y
Application number: CN 94219180
Authority: CN
Inventors: 李子义
Original assignee: Zhengyixingye Co ltd
Current assignee: Zhengyixingye Co ltd
Priority date: 1994-08-12
Filing date: 1994-08-12
Publication date: 1995-05-24
Anticipated expiration: 2004-08-12

Abstract

The utility model relates to a DC radiation fan. An upper pole yoke sheet and a lower pole sheet of a stator form a backplane formed from two staggered semicircles, a magnetic sheet is arranged on the connecting position of the two semicircles along both sides of the backplane and is vertical to the backplane, the magnetic sheet forms two stages of discontinuous arc lines, a coil holder is arranged between the upper and the lower pole yoke sheets, and a blade type rotor is arranged in the matching way in the central hole of the coil holder. During operation, the magnetic induction of the end face is asymmetrically distributed, when an unexpected stoppage in the work occurs, the rotor can not be attracted because of different poles, the outer end face of the central shaft hole of the rotor is arranged in the annular turning way with a plurality of screw blocks, the rotating shaft of the rotor is matched with the shaft hole; when rotating, oil and grease are prevented from overflowing by the screw blocks, and the service life of the product is prolonged.

Description

DC radiation fan

The utility model relates to a kind of direct current radiator fan, You Zhiqi has and can prevent that rotor shaft and stator axis hole adapted space grease are excessive and prolong product useful life, and makes that to produce magnetic force between the magnetic sheet of upper and lower long-pending yoke sheet and the permanent magnet uneven and can prevent that magnetic sheet and permanent magnet from causing that there is a natural attraction between the sexes and possibly can't restarting after stopping.

The direct current radiator fan is installed in mostly as host computer, copying machines, Video Recorder .... wait electric product, avoid to discharge the heat that its running the time produced that internal works is overheated to cause damage; The direct current radiator fan of prior art uses carbon-free brush d.c. motor mostly, its clamping one between two upper and lower long-pending yoke sheets twines the coil holder of enamelled wire, upper and lower long-pending yoke sheet is sheathed and be fixed on the circuit board with a central siphon, and long-pending yoke sheet periphery is convexly equipped with several magnetic sheets, and the magnetic sheet of upper and lower long-pending yoke sheet is staggered arrangement, the fan that again a bottom is had rotating shaft, among its rotating shaft insertion central siphon, imperial palace hole peripheral in fan is provided with permanent magnet simultaneously, makes this permanent magnet be positioned at the periphery of long-pending yoke sheet; When coil passes through electric current, this is staggered magnetic sheet and forms magnetic pole, and the sensing element of circuit board is located in utilization, can respond to the magnetic pole of the pairing permanent magnet of magnetic sheet, constantly conversion magnetic sheet magnetic pole makes the magnetic pole of magnetic sheet and permanent magnet keep same magnetic, for example S-S homopolarity or N-N homopolarity, reach the purpose of homopolar-repulsion, force the permanent magnet of stator outer shroud to gyrate, make also rotation thereupon of fan with the permanent magnet one.

But the rotation strength of the direct current radiator fan of prior art, because stator is identical with the magnetic of blade inner edge permanent magnet, and the strength that generation repels each other, because the strength that magnetic force produced is little, so work as in the blade movement if be subjected to resistance improperly, as long as and this resistance can overcome magnetic force and just can force blade to shut down, and this moment magnetic sheet magnetic pole if different with permanent magnet, and when circuit does not convert magnetic sheet to magnetic pole as yet, permanent magnet and magnetic sheet then can be attracted each other, and the formation inactive state, so when resistance is removed, because of attracting each other, permanent magnet and magnetic sheet cause a dead angle to cause fan to start, must stir blade with external force makes it break away from the dead angle, or power-on could start blade once more again, for the cooling fan that is arranged on machine intimate, it is when designing that reason stops improperly, the user is not if noted being difficult to perceive, so do not know in good time again power-on or stir to make fan rotate once more, so can cause machine to damage because of overheated, present brushless DC fan stator as shown in the above description, imperfection still in design.

The purpose of this utility model is to provide a kind of direct current radiator fan.

The purpose of this utility model is to realize like this, a kind of direct current radiator fan promptly is provided, comprise stator and flabellum rotor, this stator is last, establish a coil holder between the long-pending yoke sheet down, and wear a central siphon and have on the circuit board of magnetic pole sensing element in the default medium pore and of coil holder, and on being somebody's turn to do, following long-pending yoke sheet periphery is provided with several magnetic sheets and is arrangement alternately, flabellum rotor is to be provided with permanent magnet at the default big endoporus inner edge of rotor, and be provided with axis hole in big endoporus central authorities, in the rotating shaft of axis hole internal fixation, the medium pore that rotating shaft is matched with coil holder is driven when coil electricity, upward long-pending yoke sheet and down long-pending yoke sheet form has a base plate with two semicircle interleaved set one-tenth, magnetic sheet vertically is provided with along two semicircle junctions of base plate both sides, magnetic sheet forms two sections discontinuous camber lines, magnetic force induction at end face when circuit working is unequal distribution, makes rotor stop Shi Buhui in the work accident and inhales mutually because of opposed polarity; Outer several spiral pieces that can stop grease excessive that are provided with in end ring week of rotor shaft hatch.

Advantage of the present utility model is that it has and prevents coil holder and the excessive shortcoming of fan shaft fit clearance grease, prolong life of product, and overcome magnetic sheet and the permanent magnet issuable false dead angle of institute and blade can easily be restarted when stopped operating by resistance, do not need again power-on or stir blade with external force and restart.

Below in conjunction with accompanying drawing, embodiment of the present utility model is described, wherein:

Fig. 1 is the three-dimensional exploded view of the utility model fan;

Fig. 2 is the partial perspective view of the utility model fan propeller axis hole;

Fig. 3 is matched with the section plan of rotor shaft hatch for the utility model fan shaft;

Fig. 4 is matched with down the plan view of long-pending yoke sheet for the utility model fan loop seat.

As shown in Figure 1, the direct current radiator fan that the utility model provides comprises stator and flabellum rotor 4, wherein this stator 2 is mainly by a central siphon 24, long-pending yoke sheet 22 on one, a long-pending once yoke sheet 21 and a coil holder 23 are formed, its central siphon 24 is stratum's column, the centre is provided with a mesopore 240, go up in addition, following long-

pending yoke sheet

22,21 all have a base plate 220 with two semicircle interleaved set one-tenth, 210, and along this base plate 220, two semicircle junctions of 210 both sides vertically are provided with magnetic sheet 221,211, make magnetic sheet 221,211 form two sections discontinuous camber lines, and at base plate 220,210 centre respectively are provided with a perforation 222,212, in addition, coil holder 23 centre are provided with a medium pore 230, periphery is winding around then, also be provided with a circuit board 3, in the middle of this circuit board 3 hole is arranged also, and be provided with a magnetic pole sensing element 31 in the appropriate location.The compound mode of stator at first from top to bottom penetrates the perforation 222 of long-pending yoke sheet 22, the medium pore 230 and the perforation 212 of long-pending yoke sheet 21 down of coil holder 23 respectively successively with central siphon 24, coil holder 23 is fixed between the upper and lower long-

pending yoke sheet

22,21, the magnetic sheet of upper and lower long-

pending yoke sheet

22,21 of while is staggered mode and arranges, again central siphon 24 is penetrated the set hole of circuit board 3, whole stator is fixed on the circuit board 3; This central siphon 24 is fixed in the fan base 1 at last; Flabellum rotor 4 is provided with blade 41 at its flabellum body periphery in addition, be provided with a big endoporus 40 in the body bottom surface, be provided with all permanent magnets 42 of ring in big endoporus 40 inner peripherals, and in the middle of big endoporus 40, be provided with an axis hole 43, axis hole 43 outer faces ring is provided with spiral piece 431 week, other is provided with a rotating shaft 5 and is engaged in this axis hole 43 and central siphon 24 mesopores 240, screw action by spiral piece 431 when being matched with axis hole 43 rotation in rotating shaft 5 can stop the grease that is filled in central siphon 24 in excessive, the useful life of prolongation product.

Have again, when current flowing fan of the present utility model, be staggered magnetic sheet and form magnetic pole, simultaneously can induce the polarity of permanent magnet 42 and change magnetic pole on the magnetic sheet 221,211 at any time by the magnetic pole sensing element 31 of circuit board 3, make magnetic pole on the magnetic sheet 221,211 all be like pole and be the N-N utmost point or the S-S utmost point with corresponding permanent magnet 42, and form a kind of strength of homopolar-repulsion, utilize this strength constantly to force to be surrounded on the permanent magnet in the stator outside to rotate, and drive the vane group rotation, can reach the effect of expection.

When magnetic sheet 221 of the prior art, 211 when being subjected to resistance suddenly in rotation, resistance is if can overcome the strength that magnetic is repelled each other, promptly can force the flabellum body to stop operating, and magnetic sheet 221,211 stop positions are not if proper and corresponding permanent magnet 42 same magnetic and this circuit change magnetic sheet 221 as yet, during 211 magnetic pole, it is magnetic sheet 221,211 with among corresponding permanent magnet 42 stays in the N-S utmost point or S-N utmost point state, make magnetic sheet 221,211 inhale mutually with permanent magnet 42, when resistance is removed, structure of the prior art then may be because of magnetic sheet 221,211 and permanent magnet 42 between keep a uniform suction and the strength that can't rotate, cause fan body to start, must stir blade 41 or power-on again with external force, quite trouble; And the utility model fan forms two sections discontinuous arc shapes with magnetic sheet 221,211, make magnetic sheet 221,211 form a kind of magnetic force of inequality, so when resistance is removed, even magnetic sheet of inhaling mutually for opposite pole 221,211 and permanent magnet 42, also can cause moving of permanent magnet 42 because of the magnetic force of magnetic sheet 221,211 is uneven, power is provided in a flash by this and fan blade is rotated.

Claims

1, a kind of direct current radiator fan, comprise stator and flabellum rotor, this stator is established a coil holder between upper and lower long-pending yoke sheet, and wear a central siphon and have on the circuit board of magnetic pole sensing element in the default medium pore and of coil holder, and this upper and lower long-pending yoke sheet periphery is provided with several magnetic sheets and is arrangement alternately, flabellum rotor is to be provided with permanent magnet at the default big endoporus inner edge of rotor, and be provided with axis hole in big endoporus central authorities, in the rotating shaft of axis hole internal fixation, the medium pore that rotating shaft is matched with coil holder is driven when coil electricity, it is characterized in that:

Upward long-pending yoke sheet and down long-pending yoke sheet form has a base plate with two semicircle interleaved set one-tenth, magnetic sheet vertically is provided with along two semicircle junctions of base plate both sides, magnetic sheet forms two sections discontinuous camber lines, when circuit working, be unequal and distribute at the magnetic force induction of end face, make rotor at work accident stop Shi Buhui and inhale mutually because of opposed polarity; Outer several spiral pieces that can stop grease excessive that are provided with in end ring week of rotor shaft hatch.