A type of electro-hydraulic proportional servo valve with a spiral positioning and control mechanism for shut-off valve sleeve.

By adopting a novel structural design for the pilot-controlled valve sleeve and valve core, the problems of large rotational inertia and complex maintenance of existing two-dimensional electro-hydraulic servo valves have been solved, achieving higher precision and response time, reducing maintenance costs, and improving flow rate and anti-contamination capabilities.

CN117738952BActive Publication Date: 2026-06-30ZHEJIANG UNIV
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Patent Information

Application Number
CN202311785083.5
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-12-22
Publication Date
2026-06-30
Estimated Expiration
2043-12-22

AI Technical Summary

Technical Problem

The existing two-dimensional electro-hydraulic servo valves have a large moment of inertia due to the external rotor directly driving the valve core, which requires high-performance motors, and the friction affects performance. They are also complex and costly to maintain.

Method used

The design employs a pilot-controlled valve sleeve and valve core insertion section. The axial movement of the valve core is driven by the rotation of the pilot-controlled valve sleeve, which simplifies the maintenance process. The variable throttling orifice is formed by the cooperation of the sensitive cavity channel with the high-pressure orifice and the low-pressure orifice to control the pressure.

Benefits of technology

It reduces the effects of rotational inertia and friction, improves accuracy and response time, simplifies the maintenance process, reduces maintenance costs, and enhances resistance to contamination and flow rate.

✦ Generated by Eureka AI based on patent content.

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Abstract

This invention provides a valve sleeve spiral positioning and guided electro-hydraulic proportional servo valve. The electro-hydraulic proportional servo valve includes a spool valve assembly, an oil port changing plate at the left end of the spool valve assembly, and an electric actuator at the right end of the spool valve assembly. A valve core that can slide in the axial direction is disposed inside the spool valve assembly, and the valve core portion is inserted into the electric actuator. A guide-stage valve sleeve is rotatably connected inside the electric actuator, and the guide-stage valve sleeve is connected to the valve core insertion portion. A guide structure is provided between the valve core insertion portion and the guide-stage valve sleeve. This invention successfully reduces the moment of inertia, enabling the motor to drive the valve core movement with lower torque output. Furthermore, this invention can also reduce the subsequent maintenance costs of the servo valve.
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Citation Information

Patent Citations

  • Single-spring axial reset type half-bridge two-dimensional electro-hydraulic servo valve directly driven by two-dimensional motor

    CN115823050A

  • Double-spring axial reset type half-bridge two-dimensional electro-hydraulic servo valve directly driven by two-dimensional motor

    CN115875499A

  • High-pressure high-response plug-in type electro-hydraulic proportional directional valve

    CN113339347A

  • Underconstrained external rotor motor direct-driven two-dimensional electro-hydraulic servo valve

    CN115949638A