Explosion-proof current diverting device

• US 9,831,739 B2
• Filed: 06/17/2016
• Issued: 11/28/2017
• Est. Priority Date: 06/18/2012
• Status: Active Grant

• Current Assignee: Inpro/Seal LLC (Waukesha Bearings Corporation)
• Original Assignee: Inpro/Seal LLC (Waukesha Bearings Corporation)
• Inventors: Tejano, Robert A., Hoehle, Neil F.
• Primary Examiner(s): NGUYEN, TRAN N
• Application Number:
  US15/186,191
• Publication Number:
  US 20160372987A1
• Time in Patent Office: 529 Days
• CPC Class Codes: F16J 15/4478 Pre-assembled packings
• CPC Class Codes: H01R 39/12 using bearing or shaft surface as contact surface
• CPC Class Codes: H01R 39/18 Contacts for co-operation with commutator or slip-ring, e.g. contact brush
• CPC Class Codes: H01R 39/64 Devices for uninterrupted current collection
• CPC Class Codes: H02K 11/40 Structural association with grounding devices
• CPC Class Codes: H02K 5/136 explosion-proof
• CPC Class Codes: H02K 5/1732 radially supporting the rotary shaft at both ends of the rotor H02K5/1737 takes precedence

Abstract

A bearing isolator and explosion-proof current diverting device may be configured to dissipate an electrical charge from a rotating piece of equipment to ground, such as from a motor shaft to a motor housing. One aspect of an explosion-proof current diverter ring may include a stator that may be mounted to the equipment housing and a rotor that may be mounted to a shaft. The rotor may rotate with the shaft. A conductive assembly may be positioned in a radial bore formed in the stator such that the conductive assembly contacts the rotor to conduct electricity from the shaft to the housing through the explosion-proof current diverting device. The explosion-proof current diverting device may be configured to define a flame path to achieve various explosion-proof certifications.

Claims

1. A bearing isolator comprising:

a. a stator configured for engagement with an equipment housing, wherein said stator is in electrical communication with said equipment housing, said stator comprising;

i. a main body;

ii. an axial groove formed in said main body;

iii. a radial bore extending from a radially exterior surface of said stator to said axial groove;

b. a rotor configured for engagement with a shaft extending from and rotatable with respect to said equipment housing, wherein said rotor is in electrical communication with said shaft, said rotor comprising;

i. a main body;

ii. an axial projection extending from said main body of said rotor and into said radial bore of said stator, wherein said axial projection is formed with a radially exterior surface; and

,

c. a conductive assembly positioned in said radial bore, wherein said conductive assembly is in electrical communication with said stator, and wherein a contact portion of said conductive assembly extends radially inward and physically contacts said radially exterior surface of said axial projection of said rotor.

2. The bearing isolator according to claim 1 wherein said radially exterior surface of said axial projection of said rotor is further defined as being smooth and having a circular cross-sectional shape.

3. The bearing isolator according to claim 1 wherein said stator further comprises a shoulder formed on a radially exterior surface thereof.

4. The bearing isolator according to claim 1 wherein said rotor further comprises a first radial projection extending from said axial projection, wherein said first radial projection defines a first axial boundary of said radially exterior surface of said axial projection of said rotor.

5. The bearing isolator according to claim 4 wherein said rotor further comprises a second radial projection extending from said axial projection, wherein said second radial projection defines a second axial boundary of said radially exterior surface of said axial projection of said rotor, wherein a distance between said first and said second radial projections define a contact channel, and wherein a part of said contact portion of said conductive assembly is positioned between said first radial projection and said second radial projection of said rotor.

6. The bearing isolator according to claim 1 wherein said stator further comprises:

a. a radial groove extending in a radially outward direct from said shaft, wherein said radial groove is annular; and

,

b. an interior drain in fluid communication with said radial groove in said stator and an interior portion of said equipment housing.

7. The bearing isolator according to claim 1 wherein said stator further comprises:

a. a radial groove extending in a radially outward direction from said shaft; and

,

b. an external drain in fluid communication with said radial groove in said stator.

8. The bearing isolator according to claim 7 wherein said rotor further comprises a radial groove extending in a radially inward direction to said shaft.

9. The bearing isolator according to claim 8 wherein said radial groove in said stator is axially aligned with said radial groove in said rotor.

10. The bearing isolator according to claim 1 further comprising:

a. a second radial bore formed in said stator, wherein said second radial bore extends from said radially exterior surface of said stator to said axial groove;

b. an insulator positioned in said second radial bore; and

,

c. an indicator assembly positioned in said insulator, wherein said indicator assembly is not in electrical communication with said stator.

11. The bearing isolator according to claim 10 further comprising a communication plug, wherein said communication plug is in communication with said indicator assembly.