Device for measuring the displacement travel of a hydraulic displacement mechanism
US7874801B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 7, 2007 |
| Grant date | Jan 25, 2011 |
| Priority date | — |
| Expiry date | Oct 23, 2029 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF04D27/001
- WIPO fieldEngines, pumps, turbines
- WIPO sectorMechanical engineering
Abstract
A device for measuring the displacement travel of a hydraulic displacement mechanism for blades of an impeller of an axial-flow fan, wherein the displacement mechanism includes as components a displacement cylinder and a piston rod having a piston, one of the components being axially displaceable and the other component not being axially displaceable. Respective spindles of the blades are secured to a displacement disk to which is connected the axially displaceable component of the displacement mechanism. An oil transfer element surrounds an extension of the piston rod that extends out of the displacement cylinder. A magnetostrictive displacement-measuring device that includes a sensor housing with a wave guide, sensor head, and an annular magnet is coupled to the displacement mechanism. The sensor housing and the sensor head are connected to the oil transfer element. Either the oil transfer element or one of the displacement mechanism components is axially displaceable relative to the other component. The magnet is connected to that component for which the axial displacement relative to the oil transfer element exists.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.