Pressure exchanger

Patent metadata

Field	Value
Publication number	US-12270422-B2
Application number	US-202217878991-A
Country	US
Kind code	B2
Filing date	Aug 2, 2022
Priority date	Aug 4, 2021
Publication date	Apr 8, 2025
Grant date	Apr 8, 2025

Abstract

A pressure exchanger with a valve system includes a cylinder barrel ( 1 ), two valve plates ( 2 ) and two port plates ( 3, 4 ), wherein the cylinder barrel ( 1 ) has at least one cylinder ( 7 ) which accommodates a piston ( 8 ). The objective is to provide a pressure exchanger with low wear and a low maintenance effort. This objective is solved by a pressure exchanger including a piston ( 8 ) braking system and that the piston ( 8 ) includes a pressure relief arrangement.

First claim

The invention claimed is:

1. A pressure exchanger with a valve system comprising a cylinder barrel, two valve plates and two port plates, wherein the cylinder barrel comprises at least one cylinder which accommodates a piston, wherein the pressure exchanger comprises a piston braking system and that the piston comprises a pressure relief arrangement, wherein the piston comprises two sides facing in a longitudinal direction of the cylinder, and wherein the pressure relief arrangement comprises at least temporarily a fluidic connection between the two sides of the piston.

2. The pressure exchanger according to claim 1 , wherein the piston is arranged floating in the cylinder.

3. The pressure exchanger according to claim 1 , wherein the piston braking system comprises at least one thrust pad forming a chamber between the cylinder barrel and the valve plates.

4. The pressure exchanger according to claim 3 , wherein the at least one thrust pad protrudes partially radially inward with respect to an inner surface of the cylinder.

5. The pressure exchanger according to claim 3 , wherein the piston comprises at least a conical part.

6. The pressure exchanger according to claim 5 , wherein the chamber is at least partly closed by the conical part when the piston is in an end position of the cylinder.

7. The pressure exchanger according to claim 6 , wherein the at least one conical part is an annular projection from a center part of the piston.

8. The pressure exchanger according to claim 1 , wherein the pressure relief arrangement comprises at least a cavity arranged in an interior of the piston, wherein the cavity is fluidly connected to both sides of the piston.

9. The pressure exchanger according to claim 1 , wherein the pressure relief arrangement comprises at least a cavity filled with a spongy material, wherein the cavity is fluidly connected to both sides of the piston.

10. The pressure exchanger according to claim 1 , wherein the pressure relief arrangement comprises at least one relief channel.

11. The pressure exchanger according to claim 1 , wherein the pressure relief arrangement comprises at least a valve.

12. A pressure exchanger with a valve system comprising a cylinder barrel, two valve plates and two port plates, wherein the cylinder barrel comprises at least one cylinder which accommodates a piston, wherein the pressure exchanger comprises a piston braking system and that the piston comprises a pressure relief arrangement, wherein the piston comprises two sides facing in a longitudinal direction of the cylinder, and wherein the pressure relief arrangement is configured to reduce excess pressure on one of the two sides of the piston through a fluidic connection between the two sides of the piston.

Assignees

• Danfoss As

Inventors

• Andersen Stig Kildegaard
• Hansen Poul Erik
• Enevoldsen Georg Herborg
• Evald Kevin

Classifications

• F03C1/0636

  having rotary cylinder block · CPC title

• Y02A20/131

  Reverse-osmosis · CPC title

• F04B9/1172

  the movement of each pump piston in the two directions being obtained by a double-acting piston liquid motor · CPC title

• F04B1/20

  having rotary cylinder block · CPC title

• F04F13/00 Primary

  Pressure exchangers · CPC title