CN1280548C

CN1280548C - Fan motor

Info

Publication number: CN1280548C
Application number: CN 02145378
Authority: CN
Inventors: 白木学; 小野寺启; 钱华
Original assignee: SHANGHAI SIKAO ELECTRONIC CO Ltd
Current assignee: SHANGHAI SIKAO ELECTRONIC CO Ltd
Priority date: 2002-11-25
Filing date: 2002-11-25
Publication date: 2006-10-18
Anticipated expiration: 2022-11-25
Also published as: CN1502817A

Abstract

The present invention provides a fan motor capable of reducing oil consumption and decreasing noise, which is composed of a rotor and a stator, wherein a rotating shaft of the rotor is inserted into a through hole of a stator bearing, and the through hole is poured with oil liquid; the periphery of the upper port of the through hole of the stator bearing is provided with an annular oil seal; a position on the inner wall of the stator bearing and under the oil seal is provided with a space which is communicated with the bottom of the through hole. Because the oil seal is arranged at the periphery of the upper port of the through hole for holding the oil liquid, and a passage which is communicated with the through hole is formed on the inner wall of the stator bearing, the oil liquid dispersed from the port of the through hole of the stator bearing can circularly flow back into the through hole; thus, oil consumption is reduced, and friction force between the rotating shaft and the stator bearing is decreased so as to reduce the noise.

Description

Fan motor

Technical field

The present invention relates to a kind of fan motor, thereby it can distribute the heat that produces in the various Electrical and Electronic devices and reaches the cooling purpose.

Background technique

In common fan motor, in order to reduce cost, bearing part does not generally adopt ball bearing and adopts comparatively cheap sintered metal bearing.But because contained fluid may be lost to the outside or disperses away in the bearing, cause the bearing oil content to reduce, therefore need try every possible means to prevent the consumption of oil content.

Fig. 5 shows the sectional drawing according to the fan motor of prior art.As shown in Figure 5, fan motor 101 is made up of rotor 102 and stator 103 two-part, wherein, rotor comprises rotating shaft 104, impeller 105 and magnetite 106, magnetite 106 ringwise and the center insert rotating shaft 104, and impeller 105 is fixed in the outer surface of magnetite 106, and impeller 105 and magnetite 106 rotate when rotating shaft 104 is rotated; Stator 103 comprises casing 107, be positioned at the casing central interior and with the integrated base 109 of bottom of shell, be placed in the sintered metal bearing 108 of base 109 and motor subcoil 111, yoke plate 112 and the substrate 113 that is fixed together by screw 114 and base 109.

As shown in Figure 5, revolving meber 115 is fixed in rotating shaft 104 roots, the convex portion 116 of it and sintered metal bearing 108 constitutes a restriceted envelope, contained fluid rises along rotating shaft 104 surfaces in the bearing 108, arrive convex portion 116 in the back that stops that is subjected to revolving meber 115, thereby make the fluid circulation flow into the inside of sintered metal bearing 108, prevented the loss of fluid.

But said structure can not stop fluid to disperse to the bearing outside under action of centrifugal force completely effectively.In case and oil mass reduces, then rotating shaft 104 aggravates with the friction of sintered metal bearing 108, produces noise thus.

Summary of the invention

Order of the present invention just provides a kind of fan motor that can reduce oil consumption and reduce noise.

Form by rotor and stator according to fan motor of the present invention, the rotating shaft of described rotor is inserted in the through hole of the stator bearing that injects fluid, annular oil seal is set around bearing through hole upper end-hole, part below described bearing inner wall is positioned at described oil sealing is offered the space that is communicated with the through hole bottom, bottom, described space comprises some passages that are communicated with the through hole bottom, and every passage is made up of lateral grooves that is opened in the bearing inner wall bottom and the bottom groove that is opened in the bearing inner wall bottom and communicate with lateral grooves.

Because the oil sealing that stops fluid is set around the through hole upper end-hole, and at path that is communicated with through hole of bearing inner wall formation, therefore capable of circulation the passing back in the through hole of fluid of dispersing away from bearing through hole port, reduced fuel consumption, reduce the frictional force between rotating shaft and bearing, thereby reduced noise.

Reasonable is that the described bottom groove degree of depth is reduced to the inner gradually by the outer end.Because the outer end is dark inner shallow, thus stoped fluid from through hole to the flowing of bottom groove, so better effects if.

Reasonable is that described bearing snaps in the base that is fixed in stator cage, and base is made by metallic material.Owing to adopt metallic material to make, so the base thermal expansion that the resin bearing produces can sustain rotating shaft well and rotate the time.

Reasonable is that described bearing inner wall shoulder tightens together with the bearing cap that is fixed in casing, so bearing can not thrown off from base.

Description of drawings

Fig. 1 is the fan motor sectional drawing according to preferred embodiment of the present invention;

Fig. 2 is the decomposition parts drawing of fan motor shown in Figure 1;

Fig. 3 is the schematic representation of fan motor of the present invention with fluid circulating path around the bearing; And

Fig. 4 (a)～4 (c) is the sectional drawing of fan motor of the present invention with bearing;

Fig. 5 is the sectional drawing according to the fan motor of prior art.

Embodiment

Fan motor 1 is made up of rotor 2 and stator 3, below describes their structure by Fig. 1 and Fig. 2.

As illustrated in fig. 1 and 2, rotor 2 comprises rotating shaft 4, impeller 5 and magnetite 6, magnetite 6 ringwise and the center insert rotating shaft 4, and impeller 105 is fixed in the outer surface of magnetite 6, impeller 105 and magnetite 106 rotate when rotating shaft 4 is rotated, thereby produce wind-force in rotor shaft direction.The lower end of rotating shaft 4 is a hemisphere, and magnetite 6 useful binders are bonded in the rotating shaft 4, and as shown in Figure 2, magnetic pole is uniformly-spaced alternately arranged in a circumferential direction.

As illustrated in fig. 1 and 2, in stator 3, packing ring 16 and base 9 are placed by casing 7 inner bottom parts central authorities, bearing 8 snaps in the base 9, annular base plate 13 and yoke plate 12 are inserted in the bearing 8 successively, motor subcoil 11 and bearing cap 10 are placed on the yoke plate 12 successively, with screw 14 bearing cap 10, yoke plate 12 and substrate 13 are fixed on bottom of shell at last.As shown in Figure 1, substrate 13 and yoke plate 12 are laminated on the protrusion platform of base 9 near the peripheral part in endoporus aperture, so base 9 also is fixed on the casing 7.

The detailed structure of bearing 8 will be described in conjunction with Fig. 3 and 4 (a)～4 (c) below, consider that bearing has than complex inner structure, and for easily manufactured, it can adopt resin material to make.In addition, because the pivoting friction of rotating shaft 4 and resin bearing 8 will make the bearing thermal expansion, so bearing base 9 can adopt metallic material to make.As illustrated in fig. 1 and 2, bearing cap 10 is pushed down the shoulder of bearing 8 downwards, can prevent bearing 8 and base 9 disengagements.

The inherent rotating shaft 4 of the center through hole of bearing is injected fluid before inserting in advance, and annular oil seal is inserted in rotating shaft 4 and covers in bearing through hole upper end-hole, therefore can stop from bearing through hole port to the fluid that disperses away.As shown in Figure 1, therefore oil sealing 15 lower end diameter prevent oil sealing and bearing 8 disengagements greater than the diameter of bearing cap 10 upper sheds.

Referring to Fig. 1, the action of a magnetic field that produces during to motor subcoil 11 power supply when the circuit in the substrate 13 is in magnetite 6 and yoke plate 12, thereby in magnetite 6, produce turning power, causing rotating shaft 4 is that fulcrum drives whole rotor 2 rotations with packing ring 16, at this moment, outside air slave shell opener 20 places flow into and flow out from relief opening 21.

Below describe the structure of fan motor of the present invention in detail by Fig. 4 (a)～4 (c) with bearing, Fig. 4 (a) be the plan view of this bearing, Fig. 4 (b) is the sectional view along the middle A-A ' line of Fig. 4 (a), and Fig. 4 (c) is the worm's eye view of this bearing.Shown in Fig. 4 (a)～4 (c), the center of this bearing 8 has and can form annular space 8a between through hole outer wall 8e and the bearing inner wall 8b by the through hole 8d of rotating shaft 4.Offer a plurality of through hole 8c in annular space 8a bottom along circumference, through hole 8c is communicated with through hole 8d through bearing lateral grooves 8g and bottom groove 8h.In order to prevent that fluid from flowing to bottom groove 8h from through hole 8d, the degree of depth of bottom groove 8h reduces to the inner gradually from the outer end.

The principle that fan motor of the present invention reduces oil consumption is below described.As shown in Figure 3, leave the space between oil sealing 15 and the bearing cap 10, when rotating shaft 4 was rotated, the fluid in the bearing through hole rose to the through hole top along direction shown in the arrow, and under the stopping of oil sealing 15 in the annular space 8a of inflow bearing.Subsequently, the oil in the annular space 8a flows into through hole 8c along direction shown in the arrow, after the passage that groove constitutes returns the through hole bottom, thereby forms a circuit oil circuit, has realized recycling of fluid.

Claims

1. fan motor, form by rotor and stator, the rotating shaft of described rotor is inserted in the through hole of the stator bearing that injects fluid, it is characterized in that, annular oil seal is set around bearing through hole upper end-hole, part below described bearing inner wall is positioned at described oil sealing is offered the space that is communicated with the through hole bottom, bottom, described space comprises some passages that are communicated with the through hole bottom, and every passage is made up of lateral grooves that is opened in the bearing inner wall bottom and the bottom groove that is opened in the bearing inner wall bottom and communicate with lateral grooves.

2. fan motor as claimed in claim 1 is characterized in that, the described bottom groove degree of depth is reduced to the inner gradually by the outer end.

3. fan motor as claimed in claim 2 is characterized in that described bearing snaps on the base that is fixed in stator cage, and described base is made by metallic material.

4. fan motor as claimed in claim 3 is characterized in that, described bearing inner wall shoulder tightens together with the bearing cap that is fixed in casing.

5. as any described fan motor among the claim 1-4, it is characterized in that described bearing is made by resin material.