Bellows accumulator, in particular pulsation damper

Patent metadata

Field	Value
Publication number	US-10584759-B2
Application number	US-201615755156-A
Country	US
Kind code	B2
Filing date	Aug 12, 2016
Priority date	Sep 18, 2015
Publication date	Mar 10, 2020
Grant date	Mar 10, 2020

Abstract

A bellows accumulator, in particular a pulsation damper, includes a bellows ( 3 ) arranged in an accumulator housing ( 1 ) and separating two media chambers ( 27, 28 ) from each other. Bellows folds ( 19 ) of the bellows can be moved at least partially along the inner wall ( 35 ) of the accumulator housing ( 1 ). The outside diameter of the bellows folds ( 19 ) is selected to be slightly smaller than the associated diameter of the inner wall ( 35 ) of the accumulator housing ( 1 ) in such a way that spaces ( 37, 41 ) are formed, which spaces together form a hydraulic damper for at least one medium.

First claim

The invention claimed is:

1. A bellows accumulator comprising:
an accumulator housing having first and second media chambers therein; and
a bellows inside said accumulator housing separating said first and second media chambers from each other, said bellows having bellows folds movable at least partially along an inner wall of said accumulator housing, said bellows folds having an outer diameter slightly smaller than an inner diameter of an inner wall of said accumulator housing with interspaces being formed between said bellows folds and said inner wall forming a hydraulic damper for medium in at least one of said first and second media chambers, said interspaces having a size achieving a damping effect with medium being in a gap between outer free ends of said bellows folds and said inner wall of said accumulator housing and forming a sliding guide of said bellows folds in said gap, said gap has a gap width being between 3.0 mm and 0.15 mm in a radial direction transverse to a longitudinal axis of said bellows, said bellows having a length along said longitudinal axis of 1.0 to 1.5 times an internal diameter thereof in an extended state of said bellows, said outer free ends and inner free ends of said bellows folds being tapered in cross section radially outwardly and inwardly, respectively.

2. A bellows accumulator according to claim 1 wherein
said sliding guide facilitates movement of said bellows parallel to said longitudinal axis and impedes movement of said bellows transverse to said longitudinal axis.

3. A bellows accumulator according to claim 2 wherein
said gap between said sliding guide and a corresponding bellows fold transforms into damping spaces at said inner wall of said accumulator housing at least when said bellows is extended, each of said damping spaces being delimited by said bellows folds located adjacent one another.

4. A bellows accumulator according to claim 2 wherein
no additional guides for said bellows are in a vicinity of said sliding guide inside said accumulator housing.

5. A bellows accumulator according to claim 1 wherein
medium spaces between a radial outside surface of said bellows and said inner wall of said accumulator housing contains a liquid of high viscosity; and
an interior of said bellows contains a gas.

6. A bellows accumulator according to claim 5 wherein
said liquid is phosphoric acid ester oil.

7. A bellows accumulator according to claim 6 wherein
said gas is nitrogen gas.

8. A bellows accumulator according to claim 5 wherein
said gas is nitrogen gas.

9. A bellows accumulator according to claim 1 wherein
said gap width is between 2.0 mm and 0.15 mm.

10. A bellows accumulator according to claim 1 wherein
said bellows is made of metallic material.

11. A bellows accumulator according to claim 1 wherein
a moveable end body is attached to a first axial end of said bellows; and
a second axial end of said bellows is secured to a retaining ring fixed to said accumulator housing, said second axial end being opposite said first axial end.

12. A bellows accumulator according to claim 11 wherein
said moveable end body closes an inside of said bellows relative to a medium connection in said accumulator housing, has a circular shape and has protruding guide members contacting inner wall parts of said housing with media passages extending between said guide members of said moveable end body.

Assignees

• Hydac Technology Gmbh

Inventors

• Baltes Herbert

Classifications

• F16F9/006

  characterised by the nature of the damping medium, e.g. biodegradable (variable viscosity damping adjustment F16F9/53) · CPC title

• F15B2201/3153

  the flexible separating means being bellows · CPC title

• F16F9/082 Primary

  characterised by the hydropneumatic accumulator · CPC title

• F15B2201/3158

  Guides for the flexible separating means, e.g. for a collapsed bladder · CPC title

• F15B2201/205

  using gas · CPC title