Pressure resistant static and dynamic seal assembly and method

Patent metadata

Field	Value
Publication number	US-9249884-B2
Application number	US-201214366940-A
Country	US
Kind code	B2
Filing date	Dec 14, 2012
Priority date	Dec 19, 2011
Publication date	Feb 2, 2016
Grant date	Feb 2, 2016

Abstract

A shaft sealing assembly for static and dynamic sealing includes a stator member attached to a housing and a rotor member attached to a shaft rotatable about an axis. The rotor member includes first and second pocket sections extending from upper and lower radial flanges extending in a cantilevered fashion from a tubular member. At least one static sealing member is attached to and encapsulates each pocket section. Each static sealing member presents a core portion and a pair of radial lips extending from the core portion. The stator member presents an annular wall extending to inner walls inclined conically to a central radial rim or flange separating two pocket portions and the static sealing members presenting a contact and frictionally engaging with the central radial rim as the rotor member is at a stand-still or static position.

First claim

We claim:

1. A seal assembly functionally interposed between a housing and a shaft rotatable about an axis and extending through the housing for providing a seal between the shaft and the housing, said seal assembly comprising:
a stator member attached to the housing;
a rotor member attached to the shaft and rotatable about the axis with the shaft and relative said stator member defining fluid passages therebetween; and
at least one sealing member connected to said rotor member to define enclosed pocket portions fluidly communicated with said fluid passages with said at least one sealing member deforming between a static position as said at least one sealing member frictionally engages said stator member thereby creating a closed area defined between said rotor member and said stator member and a dynamic position as said rotor member rotates about the axis thereby creating vacuum inside said enclosed pocket portions with said at least one sealing member disengaging from said stator member and moving away from said rotor member partially extending into said enclosed pocket portions in response to vacuum formed during rotation of said rotor member thereby allowing contaminants to escape the closed area and leave said seal assembly through said fluid passages.

2. A seal assembly as set forth in claim 1 , wherein there are two sealing members.

3. A seal assembly as set forth in claim 2 , wherein each of said sealing member presents a core portion and a pair of radial lips extending radially from said core portion with one of said lips extending from one distal end of said core portion and another distal end terminating into a third lip.

4. A seal assembly as set forth in claim 3 , wherein said sealing members are formed from resilient elastomeric materials.

5. A seal assembly as set forth in claim 4 , wherein said stator member presents an annular wall extending to upper and lower side walls and further inclined outwardly from said annular wall to form inclined walls and further extending into a radial flange extending generally perpendicular to said annular wall.

6. A seal assembly as set forth in claim 4 , wherein said radial flange is terminated into inner edge extending parallel to said annular wall and an axis (A) of the seal assembly.

7. A seal assembly as set forth in claim 6 , wherein said radial flange presents a terminal portion having inclined surfaces.

8. A seal assembly as set forth in claim 7 , wherein said rotor member includes a first expeller rotor presenting a plurality of radial protrusions separated by a plurality of recesses and inlets defined therein and extending through said first expeller.

9. A seal assembly as set forth in claim 8 , including a second expeller rotor attached to the shaft and presenting a tubular body having upper and lower radial flanges including inclined walls extending parallel said inclined walls of said stator member thereby forming said fluid passages.

10. A seal assembly as set forth in claim 9 , wherein said upper and lower radial flanges further include said pocket portions extending from said upper and lower radial flanges wherein each said pocket portion includes inlets defined therethrough and exposed to said fluid passages.

11. A seal assembly as set forth in claim 10 , wherein each pocket portion presents a step portion defined between said pocket portions and said upper and lower radial flanges to receive one of said radial lips of said sealing members.

12. A seal assembly as set forth in claim 11 , including at least one electromagnet device connected to at least one of said stator member and said rotor member.

13. A seal assembly functionally interposed between a housing and a shaft rotatable about an axis and extending through the housing for providing a seal between the shaft and the housing, said seal assembly comprising:
a stator member attached to the housing and presenting an annular wall extending to upper and lower side walls and further inclined outwardly from said annular wall to form inclined walls and further extending into a radial flange extending generally perpendicular to said annular wall;
a rotor member attached to the shaft and rotatable about the axis with the shaft and relative said stator member defining fluid passages therebetween with said rotor member presenting a tubular body having upper and lower radial flanges including inclined walls extending parallel said inclined walls of said stator member thereby presenting pocket portions extending from said upper and lower radial flanges wherein each said pocket portion includes inlets defined therethrough and exposed to said fluid passages; and
at least one sealing member presenting a core portion and a pair of radial lips extending radially from said core portion with one of said radial lips extending from one distal end of said core portion and another distal end terminating into a third lip with said at least one sealing member connected to said rotor member to enclose said pocket portions fluidly communicated with said fluid passages with said at least one sealing member deforming between a static position as said at least one sealing member frictionally engages said stator member thereby creating a closed area defined between said rotor member and said stator member and a dynamic position as said rotor member rotates about the axis thereby creating vacuum inside said pocket portions with said at least one sealing member disengaging from said stator member and moving away from said rotor member with said at least one sealing member partially extending into said pocket portions in response to vacuum formed during rotation of said rotor member thereby allowing contaminants to escape the closed area and leave said seal assembly through said fluid passages.

14. A seal assembly as set forth in claim 13 , wherein there are two sealing members.

15. A seal assembly as set forth in claim 14 , wherein said sealing member is formed from resilient elastomeric material.

16. A seal assembly as set forth in claim 15 , wherein said radial flange is terminated into inner edge extending parallel to said annular wall and an axis (A) of the seal assembly and presenting a terminal portion having inclined surfaces.

17. A seal assembly as set forth in claim 16 , wherein said rotor member further includes a second expeller rotor presenting a plurality of radial protrusions separated by a plurality of recesses and inlets defined therein and extending through said first expeller rotor.

18. A seal assembly as set forth in claim 17 , including at least one electromagnet device connected to at least one of said stator member and said rotor member.

19. A method of forming a pressure resistant static and dynamic seal interposed between a housing and a shaft rotatable about an axis and extending through the housing, said method comprising the steps of:
connecting a stator member attached to the housing with a rotor member attached to the shaft to define fluid passages therebetween;
rotating the rotor member about the axis with the shaft and relative the stator member; and
connecting at least one sealing member to the rotor member to define an enclosed pocket portion fluidly communicated with the fluid passages to deform the at least one sealing member between a static position as the at least one sealing member frictionally engages the stator member to create a closed area between the rotor member and the stator member and a dynamic position as the rotor member rotates about the axis to create vacuum inside the pocket portion and disengaging from th

Assignees

• Jönsson Sven Anders
• Epshetsky Yefim
• Uncapher Bryan
• Skf Ab

Inventors

• Jönsson Sven Anders
• Epshetsky Yefim
• Uncapher Bryan

Classifications

• F16J15/44

  Free-space packings · CPC title

• F16J15/164 Primary

  the sealing action depending on movements; pressure difference, temperature or presence of leaking fluid · CPC title

• F16J15/3404 Primary

  and characterised by parts or details relating to lubrication, cooling or venting of the seal · CPC title