Pipe connection for conducting a pressurized fluid

Patent metadata

Field	Value
Publication number	US-9903514-B2
Application number	US-201414903959-A
Country	US
Kind code	B2
Filing date	Jun 25, 2014
Priority date	Jul 15, 2013
Publication date	Feb 27, 2018
Grant date	Feb 27, 2018

Abstract

A pipe connection that includes two tubular connection pieces for a conical clamping connection, the connection pieces being screwed together by a union nut while one connection piece is plugged inside the other. Each connection piece has a conical sealing surface which sealingly rests against the other, and an annular groove is provided in one of the sealing surfaces. The union nut is slit on the collar side.

First claim

The invention claimed is:

1. A pipe connection for conducting a pressurized fluid, comprising:
two tubular connection pieces which are screwed together by a union nut in a conical clamping connection with one plugged into the other,
wherein each connection piece has a conical sealing surface which bears in each case against the other of the two conical sealing surfaces,
wherein the union nut comprises a tubular portion which at least partially has an internal thread for screwing the union nut on a first connection piece of the two tubular connection pieces, and a collar, arranged at one end of the tubular portion, for axially clamping a second connection piece of the two tubular connection pieces to the first connection piece, wherein the collar has a number of slits distributed around its circumference, and wherein the number of slits form an annular array of axially projecting clamping hooks, and
an insulating tube arranged in an interior formed by the two tubular connection pieces and comprising a first end sealed against an inner surface of the first connection piece, a second end sealed against an inner surface of the second connection piece, and a flange abutting the inner surface of the first connection piece at a respective conical sealing surface of the first connection piece,
wherein an outer surface of the insulating tube is spaced apart from the first connection piece and the second connection piece, forming a gap therebetween, the gap thermally isolating an interface of the two conical sealing surfaces from the insulating tube.

2. The pipe connection as claimed in claim 1 ,
wherein in the union nut the number of slits have a slit length that is measurable in an axial direction and that the number of slits extend into the tubular portion.

3. The pipe connection as claimed in claim 1 ,
wherein the union nut has an overall axial length and the slits extend as far as a middle of the overall axial length.

4. The pipe connection as claimed in claim 1 , wherein the second connection piece comprises a flange, wherein the clamping hooks clamp on the flange to urge the conical sealing surfaces together.

5. The pipe connection as claimed in claim 4 , wherein radially inner surfaces of the clamping hooks cooperate to form a first ramp, wherein the flange comprises a ramped outer surface configured to form a second ramp, wherein the first ramp and the second ramp cooperate so a radial clamping force exerted by the clamping hooks produces axial force that urges the conical sealing surfaces together.

6. The pipe connection as claimed in claim 4 , further comprising a monolithic body comprising the second connection piece and the flange.

7. The pipe connection as claimed in claim 1 , wherein one of the conical sealing surfaces comprises an outward conical sealing surface and the other of the conical sealing surfaces comprises an inward conical sealing surface, wherein the outward conical sealing surface comprises an annular groove recessed therein that is suitable for holding graphite therein and also for holding the graphite in a sealing manner against the inward conical sealing surface.

8. The pipe connection as claimed in claim 1 , wherein the clamping hooks are configured to flex radially outward when the union nut is turned after the conical sealing surfaces seat on each other.

9. The pipe connection as claimed in claim 1 , wherein an interference between the flange and the inner surface of the first connection piece prevents axial movement of the insulating tube.

Assignees

• Siemens Ag

Inventors

• Boettcher Andreas
• Krieger Tobias
• Lapp Patrick

Classifications

• F16L19/025 Primary

  the pipe ends having integral collars or flanges · CPC title

• F16L59/181

  Joints in which sealing surfaces are pressed together by means of a member, e.g. a swivel nut, screwed on or into one of the joint parts · CPC title

• F16L51/00

  Expansion-compensation arrangements for pipe-lines (telescopic pipes F16L27/12) · CPC title