US 2024/0003264 A1Published application

Testing mechanical overspeed protection systems

AssigneesDurali System Design & Automation Co., Sharif University of Technology

InventorsMohammad Durali, Mohammad Hossein Heydari, Amir Mahdi Soufi Enayati, Seyed Mahdi Hosseini

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Abstract

A system for calibrating the trip speed of a mechanical overspeed sensing device by manipulating the compression of a spring of the overspeed sensing device. The system may include a rotatable annular mount, on which the mechanical overspeed sensing device is mounted and a trip sensor. The system may drive a rotational movement of the annular mount with a varying speed over time during a test run. The system may designate a rotational speed of the annular device at which the trip sensor is struck by the mechanical overspeed sensing device as a measure trip speed. The measured trip speeds may be determined for various compressions of the spring of an exemplary mechanical overspeed sensing device and based on a desired tripping speed received from a user, a compression value of the spring may be selected for which the closest measured tripping speed to the desired tripping speed is obtained.

Claims12

Dependent claims

A system for testing a mechanical overspeed sensing device, the system comprising:

a main chassis;
an annular support mounted on the main chassis, the annular support configured to allow for the mechanical overspeed sensing device to be mounted on the annular support, the mechanical overspeed sensing device comprising a spring-loaded trip weight with a predetermined spring tension;
a motor coupled to the annular support, the motor configured to drive a rotational movement of the annular support;
a rotational speed sensor coupled to the annular support, the rotational speed sensor configured to generate output signals indicative of rotational speed of the annular support at any given instance during a test interval;
a trip sensor coupled to the mechanical overspeed sensing device, the trip sensor configured to generate an output signal responsive to the trip sensor being struck by the spring-loaded trip weight;
a control unit coupled to the motor, the rotational speed sensor, and the trip sensor, the control unit comprising:
at least one processor;
at least one non-transitory memory coupled to the at least one processor, the at least one non-transitory memory configured to store executable instructions to urge the at least one processor to:
receive a plurality of test parameters, the plurality of test parameters comprising the spring tension for the spring-loaded trip weight and a speed-over-time data;
urge the motor to drive the rotational movement of the annular support based on the received speed-over-time data during the test interval;
continually receive the output signals from the rotational speed sensor during the test interval;
designating an output signal from the rotational speed sensor at a given instance as a measured trip speed responsive to receiving the output signal from the trip sensor at the given instance;
and
generate a test metric by associating the measured trip speed with the received spring tension.

11 more elements

A method for testing a mechanical overspeed sensing device, the method comprising:

receiving a speed-over-time data, a designated trip speed, and a spring tension of the mechanical overspeed sensing device;
urging the overspeed sensing device to assume a rotational movement of varying speed based on the receive speed-over-time data utilizing a test apparatus, the test apparatus comprising:
a main chassis;
an annular support mounted on the main chassis, the annular support configured to allow for the mechanical overspeed sensing device to be mounted on the annular support, the mechanical overspeed sensing device comprising a spring-loaded trip weight with a predetermined spring tension;
a motor coupled to the annular support, the motor configured to drive a rotational movement of the annular support;
a rotational speed sensor coupled to the annular support, the rotational speed sensor configured to generate output signals indicative of rotational speed of the annular support at any given instance during a test interval;
a trip sensor coupled to the mechanical overspeed sensing device, the trip sensor configured to generate an output signal responsive to the trip sensor being struck by the spring-loaded trip weight,
wherein, urging the overspeed sensing device to assume a rotational movement of varying speed based on the receive speed-over-time data comprises urging the motor to drive a rotational movement of the annular support with a varying speed based on the receive speed-over-time data;
continually receiving rotational speed readings of the rotational speed sensor;
designating a rotational speed reading of the rotational speed sensor at a given instance as a measured trip speed responsive to receiving an output signal from the trip sensor;
calculate a speed difference between the measured trip speed and the designated trip speed;
and
calibrating the trip speed of the overspeed sensing device by manipulating the spring tension of the overspeed sensing device.

10 more elements

Dependencies are inferred from the claim text.

Facts

Application: 18/346,825Filed 4 Jul 2023
Priority: 4 Jan 2021
Published: 4 Jan 2024
Term ends: Not estimatedThe source records don’t support an estimate.

Classification15 codes

F01D 21/003
Shutting-down of machines or engines, e.g. in emergency; Regulating, controlling, or safety means not otherwise provided for: arrangements for…
F01D 5/26
Blades: antivibration means not restricted to blade form or construction or to blade-to-blade connections or to the use of particular materials
F01D 21/00
Shutting-down of machines or engines
F01D 21/02
Shutting-down of machines or engines, e.g. in emergency; Regulating, controlling, or safety means not otherwise provided for: shutting-down…