Separator and hydraulic accumulator having such a separator

Patent metadata

Field	Value
Publication number	US-12404879-B2
Application number	US-202218566793-A
Country	US
Kind code	B2
Filing date	May 24, 2022
Priority date	Jun 10, 2021
Publication date	Sep 2, 2025
Grant date	Sep 2, 2025

Abstract

Separator and hydraulic accumulator having such a separator. A separator, in particular for a hydraulic accumulator, such as a bellows accumulator, which is produced by a 3D printing process, consisting of one single diaphragm, which, when viewed in cross section, is deflected in an arcuate shape to form a multitude of bellows pleats at deflection points, which delimit the bellows pleats on the outside and the inside, and in that, to obtain an isotensoid or essentially isotensoid stress profile in the diaphragm, the notional extensions of the diaphragm surfaces adjacent to each deflection point form an acute angle with each other, at least in an initial state.

First claim

What is claimed is:

1. A hydraulic accumulator, having an accumulator housing and a bellows-shaped separator disposed therein, which separates two media chambers from each other inside the accumulator housing, wherein the separator is produced by a 3D printing process, consisting of one single diaphragm; wherein the diaphragm, when viewed in cross section, is deflected in an arcuate shape to form a multitude of bellows pleats at deflection points, which delimit the bellows pleats on an outside and an inside; wherein to obtain an isotensoid or essentially isotensoid stress profile in the diaphragm, notional extensions of the diaphragm surfaces adjacent to each deflection point form an acute angle (a) with each other at least in an initial state; wherein
the individual diaphragm surface between two adjacent deflection points, which are located on opposite sides of the diaphragm, has an undulating course, wherein the diaphragm material of the diaphragm is reduced in wall thickness between two adjacent deflection points located on any common side of the diaphragm.

2. The hydraulic accumulator of claim 1 , wherein the respective deflection points, which are arcuate when viewed in cross-section, are at least partially formed from a semicircular arc.

3. The hydraulic accumulator of claim 2 , wherein the acute angle (α) is ≤30°.

4. The hydraulic accumulator of claim 2 , wherein the acute angle (α) is ≤20°.

5. The hydraulic accumulator of claim 1 , wherein the acute angle (α) is ≤30°.

6. The hydraulic accumulator of claim 1 , wherein an undulating curve of the individual diaphragm surfaces is configured to be identical in such a way that, when the diaphragm surfaces are placed against each other in full contact, they engage flush with one another.

7. The hydraulic accumulator of claim 1 , wherein for a waveform of the diaphragm, in which one diaphragm surface in stacking sequence has a greater inclination relative to the arcuate deflection point than the diaphragm surface adjacent to the deflection point.

8. The hydraulic accumulator of claim 1 , wherein the material from which the diaphragm is made is one of:
Titanium,
Stainless steel, or
Aluminum.

9. The hydraulic accumulator of claim 1 , wherein the diaphragm forms a hollow cylinder in the final printed state.

10. The hydraulic accumulator of claim 1 , wherein the acute angle (α) is ≤20°.

11. A separator for a bellows accumulator, which separator movably separates a gas media chamber and a fluid media chamber from each other, consisting of one single diaphragm; wherein the diaphragm, when viewed in cross section, is deflected in an arcuate shape to form a multitude of bellows pleats at deflection points, which delimit the bellows pleats on an outside and an inside; wherein to obtain an isotensoid or essentially isotensoid stress profile in the diaphragm, notional extensions of the diaphragm surfaces adjacent to each deflection point form an acute angle with each other at least in an initial state; wherein
the individual diaphragm surface between two adjacent deflection points, which are located on opposite sides of the diaphragm, has an undulating course, wherein the diaphragm material of the diaphragm is reduced in wall thickness between two adjacent deflection points located on any common side of the diaphragm.

12. A separator for a bellows accumulator with an accumulator housing for receiving the separator therein, the separator consisting of one single diaphragm; wherein
the diaphragm, when viewed in cross section, is deflected in an arcuate shape to form a multitude of bellows pleats at deflection points, which delimit the bellows pleats on an outside and an inside; wherein
to obtain an isotensoid or essentially isotensoid stress profile in the diaphragm, notional extensions of the diaphragm surfaces adjacent to each deflection point form an acute angle (α) with each other at least in an initial state; wherein
the acute angle (α) is ≤30°; and wherein
the diaphragm material of the diaphragm is reduced in wall thickness between two adjacent deflection points located on any common side of the diaphragm, and the individual diaphragm surface between two adjacent deflection points, which are located on opposite sides of the diaphragm, has an undulating course.

13. The separator of claim 12 , wherein the respective deflection points, which are arcuate when viewed in cross-section, are at least partially formed from a semicircular arc.

14. The separator of claim 12 , wherein for a waveform of the diaphragm, in which one diaphragm surface in stacking sequence has a greater inclination relative to the arcuate deflection point than the diaphragm surface adjacent to the deflection point.

15. A separator, which is produced by a 3D printing process, consisting of one single diaphragm; wherein
the diaphragm, when viewed in cross section, is deflected in an arcuate shape to form a multitude of bellows pleats at deflection points, which delimit the bellows pleats on an outside and an inside; wherein
to obtain an isotensoid or essentially isotensoid stress profile in the diaphragm, notional extensions of the diaphragm surfaces adjacent to each deflection point form an acute angle (α) with each other at least in an initial state; wherein
the diaphragm material of the diaphragm is reduced in wall thickness between two adjacent deflection points located on any common side of the diaphragm; and wherein the individual diaphragm surface between two adjacent deflection points, which are located on opposite sides of the diaphragm, has an undulating course.

16. The separator of claim 15 , wherein the acute angle (α) is ≤30°.

17. The separator of claim 15 , wherein an undulating curve of the individual diaphragm surfaces is configured to be identical in such a way that, when the diaphragm surfaces are placed against each other in full contact, they engage flush with one another.

18. The separator of claim 15 , wherein for a waveform of the diaphragm, in which one diaphragm surface in stacking sequence has a greater inclination relative to the arcuate deflection point than the diaphragm surface adjacent to the deflection point.

Assignees

• Hydac Technology Gmbh

Inventors

• Kloft Peter
• Kusserow Torsten

Classifications

• F16J3/047

  Metallic bellows · CPC title

• F15B2201/61

  Assembling or methods for making separating means therefor · CPC title

• F15B2201/3153

  the flexible separating means being bellows · CPC title

• B33Y80/00

  Products made by additive manufacturing · CPC title

• B22F10/28

  Powder bed fusion, e.g. selective laser melting [SLM] or electron beam melting [EBM] · CPC title