Servovalve with torque motor

US7234482B2 · kind B2 · utility

Assignee

• JIHOSTROJ A.S. · CZ

Inventors

• Vladimír Ryne{hacek over (s)} · Lanškroun, CZ
• Tomá{hacek over (s)} Hrachovský · Znojmo, CZ

Key dates

• Filing date: Mar 21, 2005
• Grant date: Jun 26, 2007
• Expiry date: Aug 25, 2025

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T137/2278
• WIPO field: Control
• WIPO sector: Instruments

Abstract

The servovalve with torque motor consists of a cylindrical case (3) in which an armature (1) is arranged on one end of an arm (16) and a orifice (18) closing a nozzle (19) with working liquid (2) on the other side of the arm (16). The arm (16) is free to rotate round the pivot point of a flexible suspension (15) with a hole (21) of diameter corresponding to the maximum deflection of the arm (16). There are two magnetic pole shoes (5) and two electric pole shoes (4) located around the armature (1), equipped with sealing rings (6), and so the working liquid (2) filling the inside of the case (3) and surrounding the arm (16) and the armature (1) does not leak out of the inside space. Coils (7) are located outside the case (3). The pole shoes (4, 5) are equipped with threaded parts (12), fitting either into the outer ring (10) or the body (3). The magnetic pole shoes (5) are equipped with a non-magnetic protective housing (9). The servovalve solution minimizes flow of the working liquid (2) through the electromagnetic circuit area, separates this area from the working liquid (2) and facilitates adjustment of the torque motor characteristics. The servo valve is suitable for high pressur…