Bellows accumulator

Patent metadata

Field	Value
Publication number	US-11434932-B2
Application number	US-201917275745-A
Country	US
Kind code	B2
Filing date	Sep 9, 2019
Priority date	Sep 14, 2018
Publication date	Sep 6, 2022
Grant date	Sep 6, 2022

Abstract

A bellows accumulator has at least one accumulator housing (2) and a separating bellows (20) movably arranged in the accumulator housing (2). The separating bellows 20 has a plurality of bellows folds and separates two media spaces (8, 22) from one another. The stationary open end of the separating bellows (20) is fixed to the accumulator housing (2) by a securing device (24). The separating bellows (20) has, at its movable other end, a closure part (36) having a guide device (40) by which the closure part (36) is guided in the accumulator housing (2). The closure part (36) has, in addition to the guide device (40), a sealing device (50). At least in the one extended end position of the separating bellows (20), the sealing device (50) separates a fluid space (8), in which the bellows folds are arranged in the accumulator housing (2), from a fluid port (12) in the accumulator housing (2). At least in some of the other working positions, the sealing device (50) releases this fluid connection.

First claim

The invention claimed is:

1. A bellows accumulator, comprising:
an accumulator housing having a gas space and a fluid space with a fluid port and a concave inner contour adjacent the fluid port;
a separating bellows being movably arranged in the accumulator housing, having a plurality of bellows folds and separating the gas and fluid spaces from one another, a stationary open end of the separating bellows being fixed to the accumulator housing by a securer, a movable end of the separating bellows being opposite the stationary open end;
a closure part being coupled to the movable end of the separating bellows, having a guide guiding movement of the closure part in the accumulator housing and having a seal separating fluid communication of a portion of the fluid space with the bellows folds from the fluid port in an extended end position of the separating bellows and opening fluid communication in at least some other positions of the separating bellows in the accumulator housing; and
a dome on an end of the closure part facing the fluid port, the dome having a convex outer contour facing the fluid port, conforming to the concave inner contour and at least partially contacting the concave inner contour in the extended end position of the separating bellows.

2. A bellows accumulator according to claim 1 wherein
the seal on the closure part is set back from and has a reduced outer diameter relative to the guide.

3. A bellows accumulator according to claim 1 wherein
a shoulder extends radially inwardly from the accumulator housing into the fluid space, the guide engaging the shoulder in the extended end position of the separating bellows.

4. A bellows accumulator according to claim 3 wherein the shoulder has a slope tapering in a direction away from the fluid port between the guide and the seal in the extended end position.

5. A bellows accumulator according to claim 1 wherein the guide of the closure part comprises a guide ring contacting an inner wall of the accumulator housing in every working position of the separating bellows.

6. A bellows accumulator according to claim 1 wherein the bellows folds have an outer diameter smaller than an adjacent inner diameter of the accumulator housing, forming partial spaces of the fluid space causing a hydraulic damping of hydraulic fluid in the fluid space when the separating bellows is moving.

7. A bellows accumulator according to claim 1 wherein
the seal is arranged between the guide and the dome on the closure part.

8. A bellows accumulator according to claim 1 wherein the bellows folds are capable of being in contact with another in a position opposite the extended end position.

9. A bellows accumulator according to claim 1 wherein
the accumulator housing has a wrapping increasing resistance to pressure.

10. A bellows accumulator, comprising:
an accumulator housing having a gas space and a fluid space with a fluid port and a concave inner contour adjacent the fluid port;
a separating bellows being movably arranged in the accumulator housing, having a plurality of bellows folds and separating the gas and fluid spaces from one another, a stationary open end of the separating bellows being fixed to the accumulator housing by a securer, a movable end of the separating bellows being opposite the stationary open end;
a closure part being coupled to the movable end of the separating bellows, having a guide guiding movement of the closure part in the accumulator housing and having a seal separating fluid communication of a portion of the fluid space with the bellows folds from the fluid port in an extended end position of the separating bellows and opening fluid communication in at least some other positions of the separating bellows in the accumulator housing; and
a shoulder extending radially inwardly from the accumulator housing into the fluid space, the guide engaging the shoulder in the extended end position of the separating bellows, the shoulder having a slope tapering in a direction away from the fluid port between the guide and the seal in the extended end position.

11. A bellows accumulator, comprising:
an accumulator housing having a gas space and a fluid space with a fluid port and a concave inner contour adjacent the fluid port;
a separating bellows being movably arranged in the accumulator housing, having a plurality of bellows folds and separating the gas and fluid spaces from one another, a stationary open end of the separating bellows being fixed to the accumulator housing by a securer, a movable end of the separating bellows being opposite the stationary open end; and
a closure part being coupled to the movable end of the separating bellows, having a guide guiding movement of the closure part in the accumulator housing and having a seal separating fluid communication of a portion of the fluid space with the bellows folds from the fluid port in at least one extended position of the separating bellows when the seal engages a shoulder extending radially inwardly from and fixed on the accumulator housing and opening the fluid communication in at least some other positions of the separating bellows in the accumulator housing when the seal is disengaged with the shoulder, the seal being arranged between the guide and a dome on the closure part.

12. A bellows accumulator according to claim 11 wherein the guide engages the shoulder in an extended end position of the separating bellows, the shoulder having a slope tapering in a direction away from the fluid port.

13. A bellows accumulator, comprising:
an accumulator housing having a gas space and a fluid space with a fluid port and a concave inner contour adjacent the fluid port;
a separating bellows being movably arranged in the accumulator housing, having a plurality of bellows folds and separating the gas and fluid spaces from one another, a stationary open end of the separating bellows being fixed to the accumulator housing by a securer, a movable end of the separating bellows being opposite the stationary open end;
a closure part being coupled to the movable end of the separating bellows, having a guide guiding movement of the closure part in the accumulator housing and having a seal separating fluid communication of a portion of the fluid space with the bellows folds from the fluid port in at least one extended position of the separating bellows and opening fluid communication in at least some other positions of the separating bellows in the accumulator housing; and
a shoulder extending radially inwardly from and fixed on an inner surface of the accumulator housing into the fluid space having an end surface facing away from the fluid port and having an inwardly facing side surface, the end surface being engaged by the guide in an extended end position of the separating bellows, the seal engaging the side surface in the extended end position of the separating bellows.

Assignees

• Hydac Technology Gmbh

Inventors

• Baltes Herbert
• Kloft Peter

Classifications

• F15B2201/3157

  Sealings for the flexible separating means · CPC title

• F15B2201/3153

  the flexible separating means being bellows · CPC title

• F15B1/103 Primary

  the separating means being bellows · CPC title

• F15B2201/4056

  characterised by the attachment of housing components · CPC title

• F15B2201/205

  using gas · CPC title