Sealing system and retractable assembly including such

Patent metadata

Field	Value
Publication number	US-9243714-B2
Application number	US-201414506834-A
Country	US
Kind code	B2
Filing date	Oct 6, 2014
Priority date	Oct 7, 2013
Publication date	Jan 26, 2016
Grant date	Jan 26, 2016

Abstract

A retractable assembly and a sealing system, the sealing system comprising: an essentially hollow, cylindrical housing with an inner space and a peripheral groove open to the inner space in the housing. The peripheral groove defines a plane in the housing and the normal of the plane is parallel to the longitudinal axis of the housing. The groove includes at least one, preferably two, extension spaces expanding the groove. The extension space is arranged on the side of the groove facing away from the inner space. An annular seal corresponding to the groove is arranged in the groove. The annular seal is formed of at least a first section facing the inner space and a second section facing away from the inner space.

First claim

The invention claimed is:

1. A sealing system, comprising:
an essentially hollow, cylindrical housing with an inner space and a peripheral groove open to the inner space in said housing, said peripheral groove defines a plane in said housing and the normal of the plane is parallel to the longitudinal axis of said housing, said groove includes at least one, extension space expanding said groove, and said extension space is arranged on the side of said groove facing away from said inner space;
an annular seal corresponding to said groove and arranged in said groove, said annular seal is formed of at least a first section facing said inner space and a second section facing away from said inner space; and
wherein a component, which is movable parallel to the longitudinal axis of said housing and which has an end region, which is so embodied that in a first position it closes and gap-freely seals said inner space of said housing, especially when said end region of said movable component is located at the same axial position as said annular seal, especially the same axial position as a dynamic sealing surface, wherein:
the first section includes said dynamic sealing surface.

2. The sealing system as claimed in claim 1 , wherein:
said housing includes a first part and a second part;
said first part makes said housing connectable with a containment;
said second part forms said inner space;
said groove is formed by the assembly of said first part with said second part; and
said second section includes a first static sealing surface and a second static sealing surface; and
said annular seal is so embodied that said groove surrounds said annular seal at least at said first static sealing surface and said second static sealing surface gap-freely.

3. The sealing system as claimed in claim 1 , wherein:
the cross section of said annular seal is formed from the combination of a circularly shaped section facing away from said inner space, and a rectangularly shaped section facing said inner space.

4. The sealing system as claimed in claim 1 , wherein:
the cross section of said groove is smaller than the cross section of said annular seal.

5. The sealing system as claimed in claim 1 , wherein:
the material of said annular seal is ethylene-propylene rubber (EPM), ethylene-propylene-diene rubber (EPDM), a fluorine containing rubber (FKM), perfluoro rubber (FFKM), polytetra-fluoroethylene (PTFE) or a silicone.

6. The sealing system as claimed in claim 1 , wherein:
the volume of said extension space is 3-15% of the volume of said annular seal.

7. The retractable assembly as claimed in claim 1 , wherein said groove includes two extension spaces expanding said groove, and said extension spaces are arranged on the side of said groove facing away from said inner space.

8. A retractable assembly for immersion-, flow- and attachment measuring systems in analytical process technology for measuring at least one measured variable of a medium in a containment, comprising:
an essentially hollow, cylindrical, housing having a service chamber formed in the inner space of said housing; and
an immersion tube having an end region, which is axially movable in said housing between a service position run out from the medium and a process position run into the medium; wherein:
in the service position said immersion tube is positioned in said service chamber;
at least one sealing system as claimed in claim 1 ;
said housing is formed by the retractable assembly housing;
said movable component is formed by said immersion tube;
the first position corresponds to the service position; and
in the service position said annular seal closes and gap-freely seals off said service chamber, in that said end region of said immersion tube lies against said dynamic sealing surface of said annular seal.

9. The retractable assembly as claimed in claim 8 , further comprising:
a rinsing/washing chamber, which is arranged in said housing between containment and said service chamber, wherein:
a sealing system as claimed in claim 1 seals said service chamber from said rinsing/washing chamber.

10. The retractable assembly as claimed in claim 8 , wherein:
arranged on said housing for said service chamber and/or for said rinsing/washing chamber is at least one rinse, wash connection, which is so embodied that washing, or rinsing, medium flowing through said rinse, wash connection rinses, washes, cleans and/or sterilizes said annular seal or seals, especially said dynamic sealing surface, when said end region of said immersion tube in the case of the movement from the service position into process position runs over said annular seal.

11. The retractable assembly as claimed in claim 10 , further comprising:
a locking apparatus, which locks said immersion tube in a position, in which a cleaning of said annular seal is possible.

Assignees

• Conducta Endress & Hauser
• Conducta Endress & Hauser

Inventors

• Wunderlich Ingrid
• Pfauch Thomas

Classifications

• F16J15/184

  Tightening mechanisms · CPC title

• F16J15/3276

  with additional static sealing between the sealing, or its casing or support, and the surface on which it is mounted · CPC title

• F16J15/18 Primary

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

• G01N1/2035

  by deviating part of a fluid stream, e.g. by drawing-off or tapping · CPC title

• F16K11/0712 Primary

  comprising particular spool-valve sealing means · CPC title