Rotating speed sensor measuring device for liquid rocket engine

By designing a liquid rocket engine speed measurement device that includes a housing, front cover, rotor assembly, and speed sensor, the problem that existing devices cannot accurately test under normal/low temperature environments is solved. This enables the simulation of the turbopump's actual operating conditions and simplifies installation, thereby improving measurement accuracy and flexibility.

CN121633547APending Publication Date: 2026-03-10BEIJING AEROSPACE PROPULSION INST
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-12-26
Publication Date
2026-03-10

AI Technical Summary

Technical Problem

Existing liquid rocket engine speed sensor measurement devices cannot be accurately tested in normal/low temperature environments, and are complex to install, making it impossible to simulate the actual working conditions of turbopumps.

Method used

Design a speed sensor measuring device for liquid rocket engines, including a housing, a front cover, a rotor assembly, a speed sensor, and a cryogenic bearing. Speed ​​measurement is achieved by radially engaging a magnetic rod with the speed sensor. Non-magnetic materials and aluminum foil are used to isolate electromagnetic signals and simulate the working state of a turbopump under different environments.

Benefits of technology

It enables accurate speed measurement in both ambient and low temperature environments, simplifies sensor installation, simulates the real working conditions of a turbopump, and improves measurement accuracy and flexibility.

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Abstract

The invention relates to a rotating speed sensor measuring device for a liquid rocket engine. The rotating speed sensor measuring device can provide a normal-temperature working environment and a low-temperature working environment. A coil is arranged in the rotating speed sensor, the rotating speed sensor is mounted on the front cover, a certain radial matching distance is formed between the rotating speed sensor and the matched magnetic bar, and the matched magnetic bar is mounted on the rotor assembly; the rotor assembly is sleeved in the shell, and high-speed rotation of the rotor assembly drives the magnetic bar to perform circular motion, so that an internal coil of the rotating speed sensor generates periodic alternating potential, and the working performance of the rotating speed sensor is tested. The test device has normal-temperature and low-temperature test functions and a function of testing various types of sensors, and can realize rapid test verification of the rotating speed sensor in a normal-temperature state and test verification of the rotating speed sensor in a low-temperature state.
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Citation Information

Patent Citations

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  • Low-temperature high-speed bearing test device for liquid rocket engine

    CN114112387A

  • Coaxiality adjusting method for low-temperature high-speed bearing test of liquid rocket engine

    CN117103162A