In the bypass oil station system of the power plant, the main oil pump is the core power equipment, and its operating stability directly affects the reliability of the entire hydraulic system. Among them, the concentricity control of the pump and the motor shaft is a key technical link in the installation and commissioning stage. This article takes the plunger pump PV152R5EC00 as an example, combined with engineering practice, to systematically explain the control method and operation points of the shaft concentricity.

I. The influence and standard requirements of shaft concentricity deviation

1. Three major hazards of concentricity deviation

Mechanical vibration intensifies: When the shaft deviation exceeds 0.1mm, the vibration amplitude of the equipment can increase by 3-5 times, causing premature wear of the pump PV152R5EC00 bearing.

Transmission efficiency decreases: The measured data shows that for every 0.05mm increase in deviation, the transmission efficiency decreases by about 1.2%-1.8%.

Risk of seal failure: Long-term eccentric operation will cause uneven wear at the shaft seal, and the probability of leakage will increase by more than 40%.

2. Industry control standards

According to the hydraulic system installation specifications, the concentricity of the plunger pump PV152R5EC00 and the motor shaft should be controlled within 0.100mm, the end face clearance of the coupling should be maintained at 2-4mm, and the flatness deviation should not exceed 0.3mm13. Under special working conditions (such as high temperature environment), it is recommended to increase the standard to within 0.08mm.

II. Operation guide for the whole process of shaft concentricity control

1. Pre-installation preparation stage

Basic inspection: Use a laser level to check the basic flatness to ensure that the error is ≤0.05mm/m².

Component pre-installation: Temporarily fix the PV152R5EC00 pump body and motor base, pre-install the coupling but do not tighten the bolts for the time being.

Tool preparation: Equipped with professional tools such as dial indicator (accuracy 0.01mm), feeler gauge, magnetic base, etc.

2. Rough adjustment positioning process

Use the three-point support method to adjust the base height of the main oil pump PV152R5EC00, and first use a feeler gauge to roughly measure the axial clearance.

Use a ruler to initially calibrate the outer circle of the coupling, and the deviation should be controlled within 0.5mm.

Tighten the anchor bolts to 50% torque, leaving space for subsequent fine-tuning.

3. Precision calibration steps

Record data every 90° rotation to form a complete circumference measurement

Adjust the wedge-shaped gasket of the motor base to achieve micron-level precision adjustment

It is recommended to use a flexible coupling to compensate for dynamic deviations of 0.02-0.05mm

III. Application of advanced technologies and innovative practices

1. Application advantages of laser alignment instrument

Efficiency improvement: Traditional methods take 2-3 hours, and laser alignment instrument can complete precision calibration within 30 minutes.

Dynamic compensation: It can simulate the expansion of the shaft system during hot operation of the equipment and reserve compensation values.

Data traceability: Automatically generate calibration reports, record deviation curves and adjustment processes.

2. Intelligent monitoring system integration

Online monitoring module: Install vibration sensors and temperature probes to monitor the status of the shaft system in real time.

Warning threshold setting: When the radial vibration value exceeds 4.5mm/s, the alarm is triggered.

Historical data analysis: Establish the shaft health file of the plunger pump and motor to predict the maintenance cycle.

IV. Solutions to common problems

1. Increased deviation in hot operation

Cause analysis: The difference in thermal expansion coefficient between the motor and the main oil pump PV152R5EC00 pump body.

Countermeasures: Preset 0.03-0.05mm reverse deviation compensation.

2. Soft foot phenomenon treatment

Detection method: Loosen the anchor bolts one by one and observe the change in the dial indicator reading.

Correction plan: Use special wedge-shaped gaskets to ensure that the support force at the four corners is evenly distributed.

3. Accuracy deterioration after long-term operation

Maintenance strategy:

Retest concentricity every 2000 hours of operation

Regularly check the aging of the coupling rubber element

Establish a vibration spectrum analysis system to identify shaft faults early

Precise control of shaft concentricity is the basis for ensuring the long-term stable operation of the main oil pump PV152R5EC00. With the development of intelligent monitoring technology, traditional empirical debugging is gradually shifting to data-driven maintenance. It is recommended that the power plant operation and maintenance team establish standardized shaft management procedures and combine them with condition-based maintenance strategies to achieve equipment performance optimization throughout its life cycle.

When looking for high-quality, reliable piston pumps, 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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