CN111173844A

CN111173844A - Conductive bearing

Info

Publication number: CN111173844A
Application number: CN201911356155.8A
Authority: CN
Inventors: 王俊华; 沈雅丽; 文明
Original assignee: Wujiang Tianlong Electronic Machinery Equipment Co ltd
Current assignee: Wujiang Tianlong Electronic Machinery Equipment Co ltd
Priority date: 2019-12-25
Filing date: 2019-12-25
Publication date: 2020-05-19

Abstract

The invention discloses a conductive bearing which comprises a bearing and a conductive assembly, wherein the conductive assembly is composed of a conductive fiber bundle and a conductive sleeve for fixing the conductive fiber bundle, the conductive assembly is fixed on an outer ring of the bearing, the conductive assembly and the outer ring of the bearing form a conductive ring, and the conductive fiber bundle is in contact with an inner ring of the bearing. The invention integrally designs and manufactures the conducting ring and the bearing, conducts electricity at a position closer to a shaft current source and bypasses the shaft current, thereby prolonging the service life of the motor equipment for replacing the bearing, improving the guarantee period of the equipment and reducing unnecessary shutdown times.

Description

Conductive bearing

Technical Field

The present invention relates to a bearing structure.

Background

The frequency converter of the variable frequency motor can generate abundant harmonic components when supplying power, and the harmonic components can cause shaft magnetization, induce shaft voltage and generate shaft current. Shaft current flows through a rolling body of the bearing, so that oil films on the rolling body are easy to break down, and the bearing is easy to corrode. To avoid shaft currents flowing through the bearings, three solutions commonly used in the prior art are: firstly, a grounding carbon brush is additionally arranged; secondly, an insulating bearing is adopted; and thirdly, an insulating bearing bush structure is adopted. All three prior art mentioned above have the problems of high cost and weak use.

The application publication No. CN106787455A discloses an ultra-thin side circuit conductive ring. This conducting ring in use need install on the motor casing, need reform transform the motor casing, adapt to the installation requirement, cause the process complicacy, the higher problem of cost.

Disclosure of Invention

The present invention is directed to overcome the above-mentioned drawbacks of the prior art, and to provide a bearing with a new structure, which can effectively prevent the shaft current from flowing through the rolling elements.

The technical scheme of the invention is as follows: a conductive bearing comprises a bearing and a conductive assembly, wherein the conductive assembly is composed of a conductive fiber bundle and a conductive sleeve for fixing the conductive fiber bundle, the conductive assembly is fixed on an outer ring of the bearing, the conductive assembly and the outer ring of the bearing form a conductive ring, and the conductive fiber bundle is in contact with an inner ring of the bearing.

The conductive assembly and the outer ring of the bearing are integrated to form a conductive ring, and the shell of the bearing is the shell of the conductive ring.

The polishing degree of the contact surface of the bearing inner ring contacted with the conductive fiber bundle is Ra less than or equal to 0.4 micrometer.

The invention has the beneficial effects that: with conducting ring and bearing integrated design preparation, electrically conduct in the place that is more close to axle current source, bypass axle current to the life-cycle of motor equipment change bearing has been prolonged, has improved the guarantee cycle of equipment, reduces unnecessary shut down number of times.

Drawings

FIG. 1 is a block diagram of the present invention;

FIG. 2 is an axial current flow diagram of the present invention;

fig. 3 is a prior art axial current walk diagram.

Wherein: 1. the bearing comprises a bearing outer ring, 2, a bearing inner ring, 3, a rolling body, 4, a conductive component, 5, a conductive fiber bundle, 6, a motor outer cover, 7 and a conductive ring.

Detailed Description

As shown in fig. 1, the conductive bearing is an integrated design of a bearing and a conductive ring, and the structure of the conductive assembly is the same as the conductive member structure of the ultra-thin side circuit conductive ring previously applied by the applicant, and the publication number of the structure is CN 106787455A. The conductive component (4) is fixed on the inner side of the bearing outer ring (1) in a clamping or screw fixing mode. The conductive fiber bundle (5) is in contact friction with the bearing inner ring (2).

As shown in fig. 3, the conducting ring of the above-mentioned ultrathin side circuit of the prior application is installed on the outer cover of the motor, a distance exists between the conducting ring (7) and the bearing, the conducting ring (7) and the bearing are connected in parallel, the shaft current is shunted, the smaller the resistance of the conducting ring relative to the resistance of the bearing is, the higher the proportion of the shaft current flowing through the conducting ring is, and when the resistance of the conducting ring is small to a certain degree, the shaft current flowing through the bearing can be ignored. However, the resistance of the conducting ring with such a structure includes the resistance of the conducting assembly and the conducting ring housing, and a certain distance exists between the conducting ring and the bearing, and the control design of the overall resistance of the conducting ring relative to the resistance of the bearing is relatively complex.

As shown in fig. 2, which is a shaft current direction diagram of the structure of the present invention, only the conductive element (4) and the rolling element (3) are substantially connected in parallel, and the shaft current is required to flow through the motor cover (6) from the conductive element to avoid the rolling element, only the resistance of the conductive element needs to be much smaller than that of the rolling element, which is easier to achieve than the conductive ring which is much smaller than that of the whole bearing.

Claims

1. A conductive bearing is characterized by comprising a bearing and a conductive component, wherein the conductive component is composed of a conductive fiber bundle and a conductive sleeve for fixing the conductive fiber bundle, the conductive component is fixed on an outer ring of the bearing, the conductive component and the outer ring of the bearing form a conductive ring, and the conductive fiber bundle is in contact with an inner ring of the bearing.

2. The conductive bearing of claim 1, wherein the contact surface of the inner race of the bearing with the conductive fiber bundle has a finish Ra of 0.4 μm or less.

3. The conductive bearing of claim 1, wherein the conductive sleeve of the conductive member is fixed to the inner side of the outer race of the bearing by means of a snap-fit or screw-fit.