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Electro-hydraulic actuator with spring energized accumulators

一种液压致动器、蓄能器的技术，应用在蓄能器的装置、流体压力致动装置等方向，能够解决弹性隔膜恶化、液压系统不可靠操作、没法检测泄漏等问题

Inactive Publication Date: 2007-03-07
WOODWARD GOVERNOR CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Elastomeric diaphragms deteriorate over time, causing nitrogen to leak into the hydraulic fluid
Typically, as the diaphragm deteriorates over time, nitrogen slowly escapes, making it impossible to detect such leaks
Unknown failure of an accumulator can lead to unreliable operation of the hydraulic system

Method used

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  • Electro-hydraulic actuator with spring energized accumulators
  • Electro-hydraulic actuator with spring energized accumulators
  • Electro-hydraulic actuator with spring energized accumulators

Examples

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Embodiment Construction

[0015] Although the invention will be described in connection with certain preferred embodiments, it is not meant to be limited to these embodiments. On the contrary, the intention is to cover all alternatives, modifications and equivalents as included within the spirit and scope of the invention as defined by the appended claims.

[0016] The present invention overcomes many of the problems caused by conventional accumulators by providing a fail-safe electrohydraulic actuator having a plurality of accumulators integral with the actuator to provide fail-safe functionality. The integrity of the accumulator results in a fully tested and proven, backup fail-safe actuator. Diaphragm and nitrogen-filled conventional accumulators are replaced by spring-loaded piston accumulators. Due to the use of multiple accumulators built into the actuator, any accumulator may cease to function properly while the others will sufficiently shock the actuator / valve to its failsafe state.

[0017] ...

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PUM

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Abstract

An electro-hydraulic actuator with built-in fail safes is provided. Multiple accumulators are integrated into the actuator to improve reliability and redundancy. One or more accumulators can fail and the remaining accumulators provide sufficient energy to move the actuator to its fail-safe condition.

Description

technical field [0001] The present invention relates generally to electrohydraulic actuators, and in particular to electrohydraulic actuators with accumulators. Background technique [0002] An accumulator is a device that stores energy in pressurized fluid. Accumulators are a useful tool in developing efficient hydraulic systems due to their ability to store excess energy and release it when needed. Accumulators are used to provide various functions in hydraulic systems. These functions include leakage compensation, bounce and vibration absorption, noise cancellation and load balancing. [0003] Conventional accumulators for electrohydraulic actuators are nitrogen loaded. Such accumulators are generally considered to consist of an elastic diaphragm filled with nitrogen gas to provide potential energy to the hydraulic fluid to operate the actuator. The elastomeric diaphragm deteriorates over time, causing nitrogen to leak into the hydraulic fluid. Typically, nitrogen sl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F15B15/00
CPCF15B1/022
Inventor W·A·博狄克G·M·波曼J·T·斯图尔特
Owner WOODWARD GOVERNOR CO
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