Flexible mounting structure for a runner blade stress detection sensor

By installing a flexible protection device on the impeller blades, the problems of sensor positioning and protection were solved, enabling accurate dynamic stress measurement, improving the accuracy of measurement and the protection effect of the sensor, and enhancing the understanding of the water-induced force effect on the impeller blades.

CN224517976UActive Publication Date: 2026-07-17CHINA YANGTZE POWER
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
CHINA YANGTZE POWER
Filing Date
2025-07-31
Publication Date
2026-07-17

AI Technical Summary

Technical Problem

In existing technologies, it is difficult to position the strain gauges on the rotor blades, the measurement point location does not match the theoretical analysis, the impact of high-speed water flow renders the measurement data invalid, and the sensor processing method damages the blades, making it impossible to achieve accurate measurement and effective protection.

Method used

A flexible protection device is adopted, including an adhesive layer, a base layer, and a hydrophobic liquid film. The sensor is installed on the surface of the rotor blade and forms a matrix of monitoring points through equidistant positioning lines. The base layer is formed by polyurethane organic polymer material and lubricating oil, and the hydrophobic liquid film is formed by silicone oil and other lubricating oils, providing adhesive fixation and protection.

Benefits of technology

It achieves precise sensor positioning and protection, improves the accuracy of dynamic stress measurement, enhances the understanding of the coupling effect between the impeller blades and water-induced forces, and provides operational convenience and practicality.

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Abstract

The utility model belongs to the field of fluid machinery and hydroelectric generation technology, specifically provide a flexible installation structure of stress detection sensor of runner blade, sensor is installed on the surface of runner blade, the sensor surface is covered with flexible protection device, flexible protection device is from below to above in proper order is adhesion layer, base layer and hydrophobic liquid film, adhesion layer is coated in the surface of sensor and the runner blade around sensor, base layer is porous structure, and the hydrophobic liquid film is composed of lubricating oil coating perfusion on the surface of base layer. The sensor flexible installation structure realizes the sensor installation runner blade, and can carry out flexible protection to the sensor simultaneously, will not cause the damage to runner blade.
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Claims

1. A flexible installation structure of a runner blade stress detection sensor, a plurality of sensors (1) are installed on the surface of a runner blade (2), characterized in that, The sensor (1) is covered with a flexible protective device (3). The flexible protective device (3) consists of an adhesive layer (301), a base layer (302), and a hydrophobic liquid film (303) from bottom to top. The adhesive layer (301) is coated on the sensor (1) and the surface of the rotor blades (2) around the sensor (1). The base layer (302) has a porous structure. The hydrophobic liquid film (303) is composed of lubricating oil coated and injected on the surface of the base layer (302).

2. A flexible mounting structure for a runner vane stress detection sensor according to claim 1, characterized by The sensor (1) is arranged on two adjacent sets of rotor blades (2).

3. A flexible mounting structure for a runner vane stress detection sensor according to claim 2, wherein The sensor (1) is arranged on the pressure surface of one set of rotor blades (2) and the suction surface of another set of rotor blades (2).

4. The flexible mounting structure for a runner blade stress detection sensor of claim 1, wherein Multiple equidistant positioning lines (4) are arranged on the surface of the rotor blade (2). The intersection of the equidistant positioning lines (4) forms a matrix of pre-selected monitoring points. The sensor (1) is arranged at the pre-selected monitoring points along the streamline direction.

5. A flexible mounting structure for a runner vane stress detection sensor according to claim 4, wherein The equidistant positioning lines (4) are arranged at equal intervals along the streamline direction and the direction perpendicular to the streamline direction of the impeller blade (2).

6. A flexible mounting structure for a runner vane stress detection sensor according to claim 1, wherein The adhesive layer (301) is composed of a coupling agent coated on the surface of the rotor blade (2).

7. The flexible mounting structure for a runner vane stress detection sensor of claim 1, wherein The porosity of the substrate layer (302) is not less than 80%.

8. The flexible mounting structure for a runner vane stress detection sensor of claim 1, wherein The base layer (302) is a polyurethane organic polymer material.

9. The flexible mounting structure for a runner vane stress detection sensor of claim 1, wherein The lubricating oil used in the hydrophobic liquid film (303) includes one or more of silicone oil, perfluoropolyether, mineral oil, and ionic liquid.

10. The flexible mounting structure for a runner vane stress detection sensor of claim 1, wherein The lubricant used in the hydrophobic liquid film (303) is silicone oil.