CN2556824Y

CN2556824Y - Ground brush device

Info

Publication number: CN2556824Y
Application number: CN 02268223
Authority: CN
Inventors: 庞卓卉; 孔令江
Original assignee: YONGJI MOTOR FACTORY
Current assignee: YONGJI MOTOR FACTORY
Priority date: 2002-07-09
Filing date: 2002-07-09
Publication date: 2003-06-18
Anticipated expiration: 2012-07-09

Abstract

The utility model discloses a grounding brush gear, and relates to an accessory device of an electric motor which is a device for preventing and reducing electric current generation. The utility model comprises an electric brush which is contacted with a shaft-extension end of the electric motor, a brush bracket which is connected with and fixed with the electric brush and is used for the location of the electric brush, a compaction mechanism of the electric brush which consists of a bolt, a nut, and a spring sleeved on the bolt is fixed on the brush bracket, a device connecting plate is fixed with the brush bracket, an extraction conducting line is connected with the electric brush. The whole device is fixed on an outer cover of motor bearings by a connecting plate; the electric brush is contacted with the shaft-extension end of the electric motor; the extraction conducting line is connected with the motor base, thus being short-circuited between a generator rotor shaft and the motor base and reducing or removing shaft current, so as to play the role of protecting the bearings. The grounding brush gear has the advantages of simple structure, easy manufacturing, low cost and reliable use, thus effectively avoiding the production of shaft current and preventing the electrolytic corrosion caused by the shaft current to the bearings.

Description

The grounding brush device

Technical field

The utility model relates to a kind of auxiliary equipment of motor---and prevent, reduce the device that the motor shaft electric current produces, be specially a kind of grounding brush device.

Background technology

Motor shaft voltage be between the motor shaft two ends or bearing and the axle between voltage.The reason that produces mainly contains magnetic imbalance, electrostatic induction and one pole effect etc.When shaft voltage is very little, can the normal operation of bearing not impacted; When just can puncturing bearing film during greater than 300mV, shaft voltage make electric current between axle, support, form the loop.When electric current can cause the rolling bearing galvanic corrosion during greater than 1A, directly have influence on the safe operation of motor.At present shaft voltage adopts insulation bearing usually than higher motor, cuts off the loop between axle and support, and it has fundamentally stopped the generation of shaft current, but the costing an arm and a leg of insulation bearing, complex structure, production and processing is difficulty.

Summary of the invention

The utility model solves the problem that prior art exists, and a kind of simple in structure, grounding brush device that can effectively prevent, reduce the motor shaft electric current is provided.

The utility model is to adopt following technical scheme to realize: the grounding brush device, comprise with the brush of motor shaft extension end in contact, connect with brush, fixing be used for brush holder that brush locatees, be fixed on the brush holder by bolt, nut and brush hold-down mechanism that the spring on being placed in bolt constitutes, with brush holder stationary device connecting plate, be connected with brush draw lead.Whole device is fixed on motor bearings by connecting plate and covers outward, and brush and motor shaft extension end in contact are drawn lead and linked to each other with support, like this, is equivalent to machine shaft and support short circuit, reduces or has eliminated shaft current, thereby play the effect of protection bearing.

According to the difference of occupation mode, this grounding brush device structurally has radial and axial type; The former brush rubs mutually with the axle periphery of motor shaft extension end, and latter's brush rubs mutually with motor shaft extension end axial end; Correspondingly, the attrition surface of radial brush is the face of cylinder, and the attrition surface of axial type brush is the plane; In addition, both modification to some extent on the brush holder structure, the brush holder of radial has side plate, and the two ends of brush and brush holder side plate are fixed, and like this, help the location between brush and the motor shaft extension end; And axial brush holder need not side plate, axis hole that cooperates with motor shaft extension end by brush end and the location that can not realize brush with the brush holder of side plate.Though both brush holders are modification to some extent structurally, it all has been the effect of brush location.As can be seen; essence of the present utility model is to draw lead and link to each other with support from the shaft extension end of motor by brush; make short circuit between machine shaft and support; or more strictly say it is branch road that resistance is minimum in parallel on bearing; thereby play the effect that prevents the bearing galvanic corrosion; difference according to occupation mode; its brush should allow different constructional variant with shape, the structure of location, fixed structure and the brush of motor shaft extension end itself; and this constructional variant ought to be all in the protection range of the utility model claim.

Grounding brush device described in the utility model, simple in structure, easy to manufacture, cost is low, uses reliably, and the generation that can effectively stop shaft current prevents the galvanic corrosion that shaft current causes bearing.

Description of drawings

Fig. 1 is the structural representation of radial grounding brush device;

Fig. 2 is the structural representation of axial type grounding brush device;

Embodiment

Embodiment 1:

Present embodiment is a radial grounding brush device, comprise with the brush 1 of motor shaft extension end in contact, connect with brush, the fixing brush holder 2 that is used for the brush location, be fixed on the brush holder by bolt 3, nut 4 and brush hold-down mechanism that the spring 5 on being placed in bolt constitutes, with brush holder stationary device connecting plate 6, be connected with brush draw lead 7.The brush of this grounding brush device contacts, rubs with the axle periphery of motor shaft extension end, and therefore, the contact-making surface of brush and motor shaft extension end is a cylinder.Its brush holder 2 adopts the structure that has side plate, and the side plate of brush and brush holder is fixed.Device is fixed on motor bearings by connecting plate 6 and covers outward, draws lead 7 and links to each other with support.By adjusting the pressure that bolt 3 can regulating spring 5, thereby adjust the pressure between brush and motor shaft head, brush can fully be contacted with spindle nose, reduce contact resistance, be unlikely again that pressure is excessive to cause the brush abrasion too fast.For reducing loop resistance, brush selects for use red copper to make, and adds an amount of carbon dust, strengthens the abrasive resistance of brush.

Embodiment 2:

Present embodiment is an axial type grounding brush device, also comprise with the brush 1 of motor shaft extension end in contact, connect with brush, the fixing brush holder 2 that is used for the brush location, be fixed on the brush holder by bolt 3, nut 4 and brush hold-down mechanism that the spring 5 on being placed in bolt constitutes, with brush holder stationary device connecting plate 6, be connected with brush draw lead 7.The brush of this brush earthing device contacts, rubs with motor shaft extension end axial end, and brush has the axis hole 8 that cooperates with motor shaft extension end on its contact end face; As different from Example 1, its brush holder does not have side plate, and bolt, the spring of brush holder by hold-down mechanism connects with brush and brush and motor shaft extension end are compressed.

Claims

1, a kind of grounding brush device is characterized by: comprise with the brush (1) of motor shaft extension end in contact, connect with brush, the fixing brush holder (2) that is used for the brush location, be fixed on the brush holder by bolt (3), nut (4) and the brush hold-down mechanism of the formation of the spring (5) on being placed in bolt, with brush holder stationary device connecting plate (6), be connected with brush draw lead (7).

2, grounding brush device as claimed in claim 1 is characterized by: the contact-making surface of brush and motor shaft extension end is a cylinder.

3, grounding brush device as claimed in claim 1 is characterized by: brush has the axis hole (8) that cooperates with motor shaft extension end on its contact end face.