# US 11,306,745 B2 · Accumulator

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- Number: US 11,306,745 B2
- Document ID: US11306745B2
- Status: Granted
- Kind: B2
- Application number: 16/474,107
- Filed: 2017-12-21
- Published: 2020-08-06
- Granted: 2022-04-19
- Earliest claimed: 2016-12-27
- Assignees: Eaton Intelligent Power Limited
- Applicants: Eaton Intelligent Power Limited
- Inventors: Guillaume Barras
- Web page: https://patentgrep.com/patent/US11306745B2

## CPC

- F15B 1/24: with rigid separating means, e.g. pistons
- F15B 20/00: Safety arrangements for fluid actuator systems; Applications of safety devices in fluid actuator systems; Emergency measures for fluid actuator systems
- F15B 20/004: {Fluid pressure supply failure}
- F15B 20/005: {Leakage; Spillage; Hose burst}
- F15B 20/007: {Overload}
- F15B 2201/20: Accumulator cushioning means
- F15B 2201/205: using gas
- F15B 2201/31: having rigid separating means, e.g. pistons
- F15B 2201/40: Constructional details of accumulators not otherwise provided for
- F15B 2201/405: Housings
- F15B 2211/30505: Non-return valves, i.e. check valves
- F15B 2211/62: Cooling or heating means
- F15B 2211/8606: the abnormal condition being a shock
- F15B 2211/89: Control specific for achieving vacuum or "negative pressure"
- F15B: SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR

## Abstract

An accumulator includes: a main cylindrical housing having a closed first axial end and a second axial end; a piston arranged in the main cylindrical housing and sealed to an inner surface of the main cylindrical housing, which piston is movable in an axial direction and provides with the main cylindrical housing and the closed first axial end of the main cylindrical housing a variable accumulating space; an urging device arranged between the piston and the second axial end of the main cylindrical housing for urging the piston towards the first axial end of the main cylindrical housing; a fluid supply opening arranged in the first axial end of the main cylindrical housing, which fluid supply opening is in fluid connection with the variable accumulating space; and a protective cylindrical housing having a first and a second axial end, the protective cylindrical housing being arranged concentrically.

## Claims

### Claim 1

An accumulator, comprising:
a main cylindrical housing having a closed first axial end and a second axial end;
a piston arranged in the main cylindrical housing and sealed to an inner surface of the main cylindrical housing, which piston is movable in an axial direction and provides with the main cylindrical housing and the closed first axial end of the main cylindrical housing a variable accumulating space;
an urging device arranged between the piston and the second axial end of the main cylindrical housing configured to urge the piston towards the first axial end of the main cylindrical housing;
a fluid supply opening arranged in the first axial end of the main cylindrical housing, which fluid supply opening is in fluid connection with the variable accumulating space;
a protective cylindrical housing having a first and a second axial end, the protective cylindrical housing being arranged concentrically with and spaced apart from the main cylindrical housing, the protective cylindrical housing being arranged with its first axial end to the first axial end of the main cylindrical housing, and the second axial end of the protective cylindrical housing being closed and spaced apart from the second axial end of the main cylindrical housing, wherein a hole is arranged in the protective cylindrical housing; and
a one way valve arranged in the hole.

### Claim 2 (depends on 1)

The accumulator according to claim 1, wherein the space between the protective cylindrical housing and the main cylindrical housing is vacuumized.

### Claim 3 (depends on 1)

The accumulator according to claim 1, further comprising a fire extinguishing substance comprising an inert gas or an expansive foam arranged in the space between the protective cylindrical housing and the main cylindrical housing.

### Claim 4 (depends on 1)

The accumulator according to claim 1, wherein the second axial end of the main cylindrical housing is closed to provide a piston pressure chamber, and
wherein the urging device comprises a pressurized gas arranged in the pressure chamber.

### Claim 5 (depends on 4)

The accumulator according to claim 4, further comprising a fluid port extending through the closed second axial end of the protective cylindrical housing and the closed second axial end of the main cylindrical housing, which fluid port is configured to enable filling and pressurizing of the pressure chamber.

### Claim 6 (depends on 1)

The accumulator according to claim 1, wherein the hole is arranged in the protective cylindrical housing in the closed second axial end.

### Claim 7 (depends on 2)

The accumulator according to claim 2, further comprising a fire extinguishing substance comprising an inert gas or an expansive foam arranged in the space between the protective cylindrical housing and the main cylindrical housing.