Damping device

Patent metadata

Field	Value
Publication number	US-10465832-B2
Application number	US-201515542671-A
Country	US
Kind code	B2
Filing date	Dec 23, 2015
Priority date	Jan 14, 2015
Publication date	Nov 5, 2019
Grant date	Nov 5, 2019

Abstract

A damping device, in particular for damping or preventing pressure impacts, like pulsations, in hydraulic supply circuits has a damping housing ( 1 ) surrounding a damping chamber with a fluid inlet ( 13 ) and a fluid outlet ( 15 ). A damping tube ( 21; 51 ) is located in the flow path between the damping inlet and outlet and has a branch opening ( 29; 73, 75, 77, 79, 81 ) passing through the tube wall and leading to a Helmholtz volume ( 27; 53, 55, 57, 59, 61 ) inside of the damping housing ( 1 ) forming a Helmholtz resonator in a region positioned inside of the length of the damping tube. A fluid filter ( 35 ) is arranged inside of the damping housing ( 1 ) in the flow path between the fluid inlet ( 13 ) and fluid outlet ( 15 ).

First claim

The invention claimed is:

1. A damping device for damping pulsations in hydraulic circuits, the damping device comprising:
a damping housing having a fluid inlet and a fluid outlet, said fluid inlet and said fluid outlet defining a flow direction from said fluid inlet to said fluid outlet;
a damping tube located in said damping housing in a flow path between said fluid inlet and said fluid outlet;
a space between an outer side of said damping tube and an inner side of said damping housing being divided into plural axially separated damping chambers forming plurality of Helmholtz resonators and being arranged in succession in said flow direction, each of said damping chambers being connected directly in fluid communication to an interior of said damping tube via a constantly open branch opening in a wall of said damping tube, said branch opening of each of said damping chambers having only an increasing opening cross section in said flow direction from each of said damping chambers to a next successive one of said damping chambers; and
a fluid filter inside said damping tube in said flow path between said fluid inlet and said fluid outlet.

2. A damping device according to claim 1 wherein
said fluid filter comprises a circular cylindrical filter element arranged coaxially to a longitudinal axis of said damping tube and arranged in said damping tube.

3. A damping device according to claim 1 wherein
said damping housing is a circular cylinder and is closed on both axial ends thereof by first and second housing covers having said fluid inlet and said fluid outlet, respectively, therein; and
said damping tube extends coaxially to a cylinder axis of said damping housing and has opposite axial ends are mounted on the housing covers, said damping tube being in fluid communication with said fluid inlet at one axial end of said damping tube and with said fluid outlet at an opposite axial end of said damping tube, said fluid inlet or said fluid outlet being connected in fluid communication with said interior of said damping tube via said filter element.

4. A damping device according to claim 3 wherein
said fluid filter is mounted on said second housing cover with said fluid outlet connected to an internal filter cavity surrounded by a hollow cylindrical filter medium of said fluid filter, an outside of said hollow cylindrical filter medium adjoining said interior of said damping tube.

5. A damping device according to claim 1 wherein
each of said damping chambers has a different volume.

6. A damping device according to claim 5 wherein
each successive one of said damping chambers has a decreasing volume in said flow direction.

7. A damping device according to claim 3 wherein
said damping tube has a stepped external diameter and abuts said first housing cover by a length section of reduced diameter compared to other sections of said damping tube, said length section of reduced diameter defining one of said damping chambers closest to said fluid inlet.

8. A damping device according to claim 1 wherein
said damping tube has only a single branch opening in each of said damping chambers.

9. A damping device for damping pulsations in hydraulic circuits, the damping device comprising:
a damping housing having a fluid inlet and a fluid outlet, said fluid inlet and said fluid outlet defining a flow direction from said fluid inlet to said fluid outlet;
a damping tube located in said damping housing in a flow path between said fluid inlet and said fluid outlet;
a space between an outer side of said damping tube and an inner side of said damping housing being divided into plural axially separated damping chambers forming plurality of Helmholtz resonators and being arranged in succession in said flow direction, each successive one of said damping chambers having a different decreasing volume in said flow direction, each of said damping chambers being directly connected in fluid communication to an interior of said damping tube via a single constantly open branch opening in a wall of said damping tube, said branch opening of each said damping chambers having only an increasing opening cross section in said flow direction from each of said damping chambers to a next successive one of said damping chambers; and
a fluid filter inside said damping tube in said flow path between said fluid inlet and said fluid outlet.

10. A damping device according to claim 9 wherein
said fluid filter comprises a circular cylindrical filter element arranged coaxially to a longitudinal axis of said damping tube and arranged in said damping tube.

11. A damping device according to claim 9 wherein
said damping housing is a circular cylinder and is closed on both axial ends thereof by first and second housing covers having said fluid inlet and said fluid outlet, respectively, therein; and
said damping tube extends coaxially to a cylinder axis of said damping housing and has opposite axial ends are mounted on the housing covers, said damping tube being in fluid communication with said fluid inlet at one axial end of said damping tube and with said fluid outlet at an opposite axial end of said damping tube, said fluid inlet or said fluid outlet being connected in fluid communication with said interior of said damping tube via said filter element.

12. A damping device according to claim 11 wherein
said fluid filter is mounted on said second housing cover with said fluid outlet connected to an internal filter cavity surrounded by a hollow cylindrical filter medium of said fluid filter, an outside of said hollow cylindrical filter medium adjoining said interior of said damping tube.

13. A damping device according to claim 12 wherein
said damping tube has a stepped external diameter and abuts said first housing cover by a length section of reduced diameter compared to other sections of said damping tube, said length section of reduced diameter defining one of said damping chambers closest to said fluid inlet.

14. A damping device according to claim 12 wherein
said internal fluid cavity of said fluid filter is closed by an unperforated end cap on an end of said fluid cavity remote from said second housing cover.

15. A damping device for damping pulsations in hydraulic circuits, the damping device comprising:
a damping housing surrounding a damping chamber and having a fluid inlet and a fluid outlet, said fluid inlet and said fluid outlet defining a flow direction from said fluid inlet to said fluid outlet with a hydraulic fluid flowing through said damping housing from said fluid inlet to said fluid outlet;
a damping tube located in said damping housing in a flow path between said fluid inlet and said fluid outlet, said damping tube having a branch opening extending radially through a tube wall of said damping tube and connected to a Helmholtz volume inside said damping housing forming Helmholtz resonator positioned inside a length of said damping tube;
a fluid filter element inside said damping tube in said flow path between said fluid inlet and said fluid outlet, said fluid filter element having a hollow cylindrical filter medium with a cylinder axis coaxial to said damping tube, said filter medium surrounding an inner perforated support tube, said fluid flowing through said filter medium from an outside surface of said filter medium to an inside clean surface of said filter medium, said support tube having an inner cavity with a first end thereof merging directly into and being in direct fluid communication with said fluid outlet; and
an unperforated end cap on and closing a second end of said filter element opposite said first end

Assignees

• Hydac Technology Gmbh
• Airbus Operations Gmbh

Inventors

• Baltes Herbert
• Kloft Peter
• Wohlers Alexander
• Behr Robert Marinus
• Maclennan Simon

Classifications

• F16L55/02781

  The regulating element being provided with radial outputs · CPC title

• F15B2211/615

  Filtering means · CPC title

• F16L55/045 Primary

  specially adapted to prevent or minimise the effects of water hammer · CPC title

• F15B21/008

  Reduction of noise or vibration · CPC title

• F17D1/20

  Arrangements or systems of devices for influencing or altering dynamic characteristics of the systems, e.g. for damping pulsations caused by opening or closing of valves (fluid dynamics F15D; damping pulsations in fluids in pipes in general F16L55/04) · CPC title