# US 11,994,118 B2 · Pulsation damping system

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- Number: US 11,994,118 B2
- Document ID: US11994118B2
- Status: Granted
- Kind: B2
- Application number: 17/053,073
- Filed: 2019-04-15
- Published: 2021-07-29
- Granted: 2024-05-28
- Earliest claimed: 2018-05-07
- Assignees: Mhwirth AS
- Applicants: Mhwirth GmbH
- Inventors: Roman Jansen
- Web page: https://patentgrep.com/patent/US11994118B2

## CPC

- F04B 11/00: Equalisation of pulses, e.g. by use of air vessels; Counteracting cavitation
- F04B 11/0016: {with a fluid spring}
- F04B 11/0091: {using a special shape of fluid pass, e.g. throttles, ducts}
- F04B 43/073: the actuating fluid being controlled by at least one valve
- F04B 53/10: Valves; Arrangement of valves
- F04B: POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS (machines for liquids, or pumps, of rotary-piston or oscillating-piston type F04C; non-positive-displacement pumps F04D; pumping of fluid by direct contact of another fluid or by using inertia of fluid to be pumped F04F)

## Abstract

A pulsation damping system for reducing pressure oscillations in an inlet line and/or in an outlet line of a piston pump. The piston pump includes a pump chamber which is connected to the inlet line of the piston pump via a first fluid connection and to the outlet line of the piston pump via a second fluid connection to convey a conveyance fluid. The pulsating damping system includes a damping device. The pump chamber includes a damping fluid connection via which the pump chamber is fluidically connected to the damping device to damp the pressure oscillations.

## Claims

### Claim 1

A pulsation damping system for reducing pressure oscillations in at least one of an inlet line and an outlet line of at least one piston pump,
the at least one piston pump comprising a pump chamber which is connected to the inlet line of the at least one piston pump via a first fluid connection and to the outlet line of the at least one piston pump via a second fluid connection so as to convey a conveyance fluid,
the pulsation damping system comprising:
a damping device;
a hydraulic connection line arranged between the pump chamber and the damping device; and
a throttle valve arranged in the hydraulic connection line,
wherein,
the pump chamber comprises at least one damping fluid connection via which the pump chamber is fluidically connected to the damping device so as to damp the pressure oscillations in the at least one of the inlet line and the outlet line of the at least one piston pump, and
the damping device is at least one of directly and indirectly operatively connected to the inlet line via a pressure line, the pressure line being separate from the hydraulic connection line, so as to regulate a gas pressure prevailing in the damping device.

### Claim 2 (depends on 1)

The pulsation damping system as recited in claim 1, wherein,
the at least one piston pump is provided as a piston diaphragm pump,
the pump chamber of the at least one piston pump comprises a pump working chamber and a pump conveyance chamber which is fluidically separated from and operatively connected to the pump working chamber,
the first fluid connection and the second fluid connection are arranged on the pump conveyance chamber, and
the at least one damping fluid connection is arranged on the pump working chamber.

### Claim 3

A pulsation damping system for reducing pressure oscillations in at least one of inlet line and in an outlet line of at least one piston pump,
the at least one piston pump comprising a pump chamber which is connected to the inlet line of the at least one piston pump via a first fluid connection and to the outlet line of the at least one piston pump via a second fluid connection so as to convey a conveyance fluid,
the pulsation damping system comprising:
a damping device which comprises a displacement body which is provided as a displaceable wall, as a displaceable piston, or as a displaceable diaphragm; and
at least one pressure chamber which is fluidically connected to the pump chamber,
wherein,
the pump chamber comprises at least one damping fluid connection via which the pump chamber is fluidically connected to the damping device so as to damp the pressure oscillations in the at least one of the inlet line and the outlet line of the at least one piston pump,
the displacement body of the damping device is configured to change a volume of the at least one pressure chamber,
the at least one pressure chamber is provided as a first pressure chamber which is fluidically connected to the pump chamber, and a second pressure chamber which is fluidically separated from the first pressure chamber via the displacement body, the first pressure chamber being operatively connected to the second pressure chamber,
a reservoir is arranged in at least one of the inlet line and in the outlet line, the reservoir comprising a conveyance fluid inlet and a conveyance fluid outlet, the conveyance fluid being temporarily storable in a lower area of the reservoir, and a gas volume being arranged in an upper area of the reservoir, and
the gas volume of the reservoir is fluidically connected to the second pressure chamber of the damping device.

### Claim 4 (depends on 3)

The pulsation damping system as recited in claim 3, wherein,
the at least one piston pump is provided as a piston diaphragm pump,
the pump chamber of the at least one piston pump comprises a pump working chamber and a pump conveyance chamber which is fluidically separated from and operatively connected to the pump working chamber,
the first fluid connection and the second fluid connection are arranged on the pump conveyance chamber, and
the at least one damping fluid connection is arranged on the pump working chamber.