Flexible dielectric material for high voltage switch

Patent metadata

Field	Value
Publication number	US-9443681-B2
Application number	US-201414268159-A
Country	US
Kind code	B2
Filing date	May 2, 2014
Priority date	Jul 29, 2013
Publication date	Sep 13, 2016
Grant date	Sep 13, 2016

Abstract

An electrical switch includes a tubular housing having a conductor receiving end and an operating end opposite the conductor receiving end. The tubular housing also includes a conductive interface positioned intermediate the conductor receiving end and the operating end. An operating rod extends through the operating end toward the conductor receiving end. The operating rod is moveable between a first position to engage the electrical switch and a second position to disengage the electrical switch. A gelatinous dielectric material is provided within a portion of the tubular housing, and around the operating rod, in the operating end to prevent voltage from the conductive interface from arcing to the operating end. The gelatinous dielectric material is configured to deform to maintain contact with the operating rod in the first position and the second position.

First claim

What is claimed is:

1. An electrical switch, comprising:
a tubular housing having a conductor receiving end and an operating end opposite the conductor receiving end,
wherein the tubular housing includes a conductive buttress positioned intermediate the conductor receiving end and the operating end;
an operating rod extending through the operating end toward the conductor receiving end,
wherein the operating rod is moveable between a first position to engage the electrical switch and a second position to disengage the electrical switch;
a gelatinous silicone material contained within a portion of the tubular housing, and around the operating rod, in the operating end to prevent voltage from the conductive buttress from arcing to the operating end,
wherein the gelatinous silicone material is configured to deform to maintain contact with the operating rod in the first position and the second position; and
a flexible partition located between the gelatinous silicone material and the conductive buttress,
wherein the flexible partition includes a bore therethrough for receiving the operating rod, and
wherein the flexible partition separates the gelatinous silicone material from the conductive buttress.

2. The electrical switch of claim 1 , wherein the tubular housing includes an air gap in the operating end between the flexible partition and the conductive buttress.

3. The electrical switch of claim 2 , wherein a compression spring is included within the air gap between the flexible partition and the conductive buttress.

4. The electrical switch of claim 1 , wherein the flexible partition comprises a semi-conductive material.

5. The electrical switch of claim 4 , wherein the semi-conductive material includes silicone.

6. The electrical switch of claim 1 , wherein the tubular housing includes a reinforcing sleeve comprising an intermediate segment, a first tubular extension on a first end of the intermediate segment, and a second tubular extension on a second end of the intermediate segment.

7. The electrical switch of claim 6 , wherein the intermediate segment includes one of a conductive or semi-conductive material, and wherein the first and second tubular extensions include a dielectric material.

8. The electrical switch of claim 7 , wherein the flexible partition, the intermediate segment, and the conductive buttress form a faraday cage to prevent corona discharge.

9. The electrical switch of claim 1 , wherein the flexible partition is secured to the operating rod via an interference fit.

10. The electrical switch of claim 1 , wherein the gelatinous silicone material bonds to the flexible partition, and
wherein the gelatinous silicone material adheres to the operating rod and the tubular housing in a semi-permanent manner.

11. The electrical switch of claim 1 , wherein the flexible partition is configured to be inserted over the operating rod prior to providing the gelatinous silicone material into the operating end.

12. The electrical switch of claim 11 , wherein the operating rod includes a shoulder portion joining a first diameter of the operating rod and a second diameter of the operating rod, such that the shoulder portion provides a stop for the insertion of the flexible partition.

13. The electrical switch of claim 1 , wherein the flexible partition includes an outer circumference that is frictionally engaged with an inside of the tubular housing and an inner circumference that is frictionally engaged with the operating rod.

14. The electrical switch of claim 1 , wherein the conductor receiving end further comprises:
a fixed contact electrically coupled to the conductor receiving end; and
a moveable contact electrically coupled to the conductive buttress and the operating rod,
wherein the moveable contact engages the fixed contact when the operating rod is in the first position, and
wherein the moveable contact is disengaged from the fixed contact when the operating rod is in the second position.

15. A high-voltage electrical switch, comprising;
a tubular housing including a reinforcing sleeve,
wherein the reinforcing sleeve includes a conductive intermediate segment, a first dielectric tubular extension on an operating end of the tubular housing, and a second dielectric tubular extension on a conductor receiving end of the tubular housing;
a conductive buttress positioned within the intermediate segment;
an operating rod extending through the operating end toward the conductor receiving end,
wherein the operating rod is moveable between a first position to engage the electrical switch and a second position to disengage the electrical switch;
a gelatinous dielectric material contained within a portion of the reinforcing sleeve to prevent voltage from the conductive buttress from arcing to the operating end,
wherein the gelatinous dielectric material is configured to deform to maintain contact with the operating rod in the first position and the second position; and
a flexible partition located between the gelatinous dielectric material and the conductive buttress,
wherein the flexible partition includes a bore therethrough for receiving the operating rod, and
wherein the flexible partition separates the gelatinous dielectric material from the conductive buttress.

16. The high-voltage switch of claim 15 , wherein the operating rod includes a shaft of a dielectric material.

17. The high-voltage switch of claim 15 , further comprising:
an air gap within a portion of the reinforcing sleeve between the flexible partition and the conductive buttress.

18. The high-voltage switch of claim 15 , wherein the gelatinous dielectric material adheres to the operating rod and the tubular housing in a semi-permanent manner.

19. A method of assembling a high-voltage switch, the method comprising:
molding a reinforcing sleeve into a tubular housing,
wherein the reinforcing sleeve includes a conductive intermediate segment, a first dielectric tubular extension on an operating end of the tubular housing, and a second dielectric tubular extension on a conductor receiving end of the tubular housing;
positioning an operating rod, a conductive buttress, and a contact assembly within the reinforcing sleeve,
wherein the operating rod is positioned to extend through the operating end toward the conductor receiving end, and wherein the operating rod is moveable between a first position to engage contacts within the contact assembly and a second position to disengage the contacts within the contact assembly;
inserting, over the operating rod and into the reinforcing sleeve, a flexible partition,
wherein the flexible partition is retained against the operating rod and an interior surface of the reinforcing sleeve by an interference fit; and
adding components of a dielectric, gelatinous silicone material into the operating end of the reinforcing sleeve around the operating rod,
wherein the gelatinous silicone material cures and adheres to the operating rod such that contacting surfaces of the operating rod and the gelatinous silicone material do not move relative to each other when operating rod is moved from the first position to the second position, and
wherein the flexible partition prevents the gelatinous silicone material from reaching the conductive buttress prior to the curing.

20. The method of claim 19 , wherein the gelatinous silicone material bonds to the flexible partition.

Assignees

• Thomas & Betts Int
• Thomas & Betts Int Llc

Inventors

• Siebens Larry N

Classifications

• H01H33/6606

  Terminal arrangements · CPC title

• H01H11/00

  Apparatus or processes specially adapted for the manufacture of electric switches (processes specially adapted for manufacture of rectilinearly movable switches having a plurality of operating members associated with different sets of contacts, e.g. keyboards, H01H13/88) · CPC title

• H01H33/22 Primary

  Selection of fluids for arc-extinguishing · CPC title

• H01H33/42 Primary

  Driving mechanisms · CPC title

• Y10T29/49105

  Switch making · CPC title