Sealing system and method for the production thereof

Patent metadata

Field	Value
Publication number	US-10161525-B2
Application number	US-201514802067-A
Country	US
Kind code	B2
Filing date	Jul 17, 2015
Priority date	Jul 17, 2014
Publication date	Dec 25, 2018
Grant date	Dec 25, 2018

Abstract

The invention relates to a seal for high pressure applications, in which a static and a dynamic sealing portion are separated from each other by a material thin point in such a manner that plastic flowing through the thin point is suppressed even if one of the two sealing portions is acted upon under high pressure as far as elastic compression.

First claim

What is claimed is:

1. A sealing system comprising:
a housing, the housing having a pressurizable stroke space in relation to a movable rod, the pressurizable stroke space is formed about an axis;
a press-on element including an annular projection; and
a seal including:
a first dynamic sealing portion configured to encircle the rod and seal between the seal and the rod; and
a second static sealing portion extending radially from the first sealing portion and configured to seal between the seal and the housing,

wherein the first and the second sealing portions are formed integrally with each other of a sealing material, and
wherein the first sealing portion merges into the second sealing portion via a thin portion formed by compression of a portion of the second sealing portion when the press-on element is pressed against the seal mounted on the housing to define a narrow clearance between the annular projection and the housing, wherein the narrow clearance restricts extrusion of the sealing material from the second sealing portion through the narrow clearance in the direction of the first sealing portion when pressurized.

2. The sealing system as claimed in claim 1 , wherein the second sealing portion is bounded by the thin portion, the housing and a press-on element, and screwing the press-on element onto the housing causes a predetermined pressure in the second sealing portion.

3. The sealing system as claimed in claim 1 , wherein the thin portion has a thickness of less than 0.5 mm.

4. The sealing system as claimed in claim 1 , wherein the thin portion has a thickness of less than 0.1 mm.

5. The sealing system as claimed in claim 1 , wherein the thin portion has a thickness of less than 0.05 mm.

6. The sealing system as claimed in claim 1 , wherein the thin portion encircles the axis as a ring.

7. The sealing system as claimed in claim 6 , wherein the thin portion includes a rectangular cross section.

8. The sealing system as claimed in claim 3 , wherein the thickness of the thin portion is a smallest distance between two opposite boundary lines in a cross section of the thin portion where the two opposite boundary lines extend perpendicularly to the axis.

9. The sealing system as claimed in claim 1 , wherein the first sealing portion is configured to extend parallel to a central axis thereof, and includes a portion configured to press against the rod at a pressure prevailing in the stroke space.

10. A sealing system comprising:
a housing, the housing having a pressurizable stroke space in relation to a movable rod, the pressurizable stroke space is formed about an axis;
a seal including a first dynamic sealing portion configured to encircle the rod and seal between the seal and the rod, and a second static sealing portion extending radially from the first sealing portion and configured to seal between the seal and the housing, wherein the first and the second sealing portions are formed integrally with each other of a sealing material; and
a press-on element including an annular projection, the press-on element configured to subject the seal to a press-on force in an axial direction to displace the sealing material of the seal radially in a plastic or elastic manner so that the annular projection produces a thin portion defined by a narrow clearance between the annular projection and the housing, in which the first sealing portion merges into the second sealing portion via the thin portion formed by compression of the second sealing portion by the annual projection against the housing, wherein the narrow clearance between the annular projection and the housing restricts extrusion of the sealing material from the second sealing portion through the narrow clearance in the direction of the first sealing portion when pressurized.

11. The sealing system of claim 10 further comprising: a sliding element configured to be pressed into a region of the first sealing portion to form a form-fitting connection in the axial direction between the first sealing portion and the sliding element.

12. The sealing system as claimed in claim 10 , wherein the thin portion has a thickness of less than 0.5 mm.

13. The sealing system as claimed in claim 10 , wherein the thin portion is formed as a ring and includes a rectangular cross section.

14. The sealing system as claimed in claim 13 , wherein a thickness of the thin portion is a smallest distance between two opposite boundary lines in a cross section of the thin portion where the two opposite boundary lines extend parallel to one another.

15. A sealing system comprising:
a rod movable along an axis;
a housing including a seal seat and a pressurizable stroke space extending along the axis from the seal seat, the rod extending into the stroke space;
a seal received by the seal seat, the seal including a first dynamic sealing portion extending along the axis and encircling the rod to seal between the seal and the rod, and a second static sealing portion extending radially from one end of the first sealing portion and configured to seal between the seal and the housing, wherein the first and the second sealing portions are integrally formed of a sealing material; and
a press-on element screwed into the housing along the axis, the press-on element including an annular projection subjecting a press-on force against the second sealing portion as the press-on element is screwed into the housing, the annular projection compressing a portion of the second sealing portion against the seal seat to form a thin portion in the second sealing portion defined by a narrow clearance between the annular projection and the seal seat;
wherein the narrow clearance between the annular projection and the seal seat restricts extrusion of the sealing material from the second sealing portion through the narrow clearance in the direction of the first sealing portion when pressurized.

16. The sealing system of claim 15 , wherein the thin portion has a rectangular cross section having a thickness of less than 0.5 mm.

17. The sealing system of claim 15 , wherein another end of the first sealing portion includes an outer circumference in fluid communication with the stroke space, wherein the prevailing pressure of the stroke space acts on the outer circumference to radially force the first sealing portion inwardly against the rod.

18. The sealing system of claim 15 , wherein the first sealing portion includes a sliding element radially prestressed inwardly against the rod.

19. The sealing system of claim 18 , wherein the first sealing portion includes a tapered portion that produces a prestressing force against the sliding element.

Assignees

• Dionex Softron Gmbh

Inventors

• Satzinger Adolf
• Eichhorn Thomas Armin Alexander

Classifications

• F04B53/164

  Stoffing boxes · CPC title

• G01N30/6034

  joining multiple columns · CPC title

• F16J15/18 Primary

  with stuffing-boxes for elastic or plastic packings · CPC title

• G01N30/6026 Primary

  Fluid seals · CPC title

• F16J15/3268

  Mounting of sealing rings · CPC title