In the high-speed fluid pipeline system of a thermal power plant, the platinum resistance temperature sensor WZPM2-08-44-M18-S, as a core measuring device, needs to operate stably for a long time under high temperature, high pressure and complex fluid dynamic conditions. However, the vibration fatigue fracture of the probe rod often occurs due to fluid impact, pipeline vibration or resonance effect, which directly affects the measurement accuracy and equipment reliability. In response to this challenge, a comprehensive analysis from multiple dimensions such as equipment design, installation optimization, vibration reduction measures and maintenance strategies is required to achieve effective control of the vibration fatigue of the probe rod.

1. Force characteristics of the probe rod in a high-speed fluid environment

In a high-speed fluid pipeline, the probe rod, as a direct contact component of the temperature sensor WZPM2-08-44-M18-S, needs to withstand the impact force of the fluid, vibration energy transfer and possible cavitation effects. When a high-speed fluid flows through the probe rod, pressure fluctuations and vortex shedding will form on its surface. Especially when the fluid velocity approaches or exceeds the critical value, the fluid vortex shedding frequency may be close to the natural frequency of the probe rod, thereby causing resonance. This resonance effect will significantly amplify the vibration amplitude of the probe, accelerate the accumulation of material fatigue, and eventually lead to fracture. In addition, the insertion depth and diameter design of the probe also directly affect its force distribution: the longer the insertion depth, the more obvious the bending moment and stress concentration at the cantilever end; while a too small diameter may reduce the structural rigidity and aggravate the vibration response. Therefore, in the design stage, it is necessary to optimize the geometric parameters and material selection of the probe through fluid mechanics simulation and material mechanics analysis to balance the strength and vibration resistance.

2. Installation optimization and structural design

In high-speed fluid pipelines, the installation position and method of the thermal resistor WZPM2-08-44-M18-S probe are crucial to its vibration resistance. First, avoid areas with severe fluid disturbances such as valves and elbows, and choose straight pipe sections with stable fluid flow. The insertion depth needs to be reasonably determined according to the pipeline diameter and flow rate. It is usually required that the end of the probe is in the isothermal zone of the fluid, rather than the center of the pipeline. This design can shorten the cantilever length, reduce the vibration amplitude of the end point, and reduce the stress concentration caused by fluid impact. For large-diameter pipes, segmented insertion or additional support brackets can be used to avoid bending and deformation of the probe rod due to its own weight or fluid impact.

In addition, the cross-sectional shape design of the probe rod also needs to be combined with fluid dynamics. Traditional circular cross-sections are prone to vortex shedding, while elliptical, triangular or cross-sections with spoiler structures can destroy the vortex shedding law and reduce the risk of resonance. For example, grooves or protrusions are machined on the surface of the probe rod to make the fluid flow more uniform and reduce local pressure fluctuations.

3. Vibration reduction measures and system coordination

The vibration source of the pipeline system usually comes from water pumps, valve opening and closing or fluid pulsation. In order to reduce the transmission of vibration to the probe rod, vibration reduction elements can be introduced during installation. For example, elastic gaskets or rubber buffers are installed at the connection between the probe rod and the pipeline to absorb high-frequency vibration energy by deformation. For high-amplitude low-frequency vibration, the overall vibration reduction design of the pipeline can be combined, such as setting expansion joints or damping brackets to reduce the vibration amplitude from the source. In addition, optimizing the pipeline flow rate and pressure gradient can also alleviate the vibration of the probe rod. By rationally designing the pipe diameter and arranging the bypass valve, the fluid can be evenly distributed in the pipe and local impact can be reduced. Regularly check the filter device of the water supply system to prevent impurities from entering the high-pressure pump or the one-way valve, and avoid pressure pulsation caused by blockage or jamming, which indirectly affects the stability of the thermal resistor WZPM2-08-44-M18-S.

4. Material selection and manufacturing process

The material selection of the temperature sensor WZPM2-08-44-M18-S directly affects its fatigue resistance. In high temperature and high pressure environments, stainless steel or corrosion-resistant alloys are common choices, which can not only resist medium erosion, but also enhance vibration resistance through their rigidity. However, relying solely on material strength is not omnipotent, and advanced manufacturing processes are also needed to improve the structural integrity of the probe rod. For example, the use of seamless forging technology can reduce internal defects in the material and reduce the risk of stress concentration; while surface heat treatment can increase surface hardness and fatigue life. In addition, a strict quality inspection process can ensure that the probe rod is free of processing defects such as cracks and pores, and eliminate the risk of breakage caused by material problems from the source.

5. Maintenance strategy and long-term reliability

Even if vibration reduction measures have been taken during the design and installation phase of the equipment, maintenance is still required to maintain its performance during long-term operation. Regular calibration is the basis for ensuring measurement accuracy, and it can also indirectly evaluate the mechanical state of the probe. During the calibration process, the temperature sensor WZPM2-08-44-M18-S and the standard reference source need to be placed in the same environment, observe the deviation between the indicated value and the actual value, and compensate the error by adjusting the zero position or range. For sensors in high-speed fluid pipelines, it is recommended to conduct on-site calibration once a quarter and send them for inspection once a year to cope with possible performance degradation caused by mechanical fatigue or medium corrosion.

Routine inspections should focus on the integrity of the probe. If surface cracks, dents or corrosion marks are found, they should be replaced in time to avoid aggravating vibration transmission due to weak structure. At the same time, check whether the connection between the temperature sensor WZPM2-08-44-M18-S probe and the pipeline is loose, and re-tighten or replace the seal if necessary. For sensors with electrical contacts, it is also necessary to verify the reliability of the contact action to prevent false triggering of control signals due to jitter. In extreme working conditions, if severe cavitation or pipeline explosion vibration occurs, the machine must be shut down for inspection immediately. At this time, the sealing and supporting structure of the pipeline system should be checked to ensure that all connections are not loose or worn. If the probe is damaged, it needs to be replaced with a device of the same model that meets the vibration resistance requirements to avoid hidden dangers due to insufficient performance of temporary substitutes.

When looking for high-quality, reliable temperature sensors, YOYIK is undoubtedly a choice worth considering. The company specializes in providing a variety of power equipment including steam turbine accessories, and has won wide acclaim for its high-quality products and services. For more information or inquiries, please contact the customer service below:
E-mail: sales@yoyik.com
Tel: +86-838-2226655
Whatsapp: +86-13618105229

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