Face grooves for state monitoring in dry gas seals

Hu, Fengming; He, Qiang; Huang, Weifeng; Yin, Yuan; Wen, Xue; Liu, Ying; Wang, Yuming

doi:10.1016/j.triboint.2023.108950

Cited by 3 publications

(3 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…During operation, the sealing system inevitably experiences a low-speed stage before the opening of the seal face when transitioning from the stopped state to the operating condition or from the operating rotation to shut down. At this time, the dynamic contact friction caused by external excitation affects the reliability and stability of the sealing system to a certain extent [45,46]. Industrial practice [47] demonstrates that wear failures in dry gas sealing devices occur during the startup and trial operation stages of sealing.…”

Section: Starting and Stopping Phasesmentioning

confidence: 99%

Research Progress on the Dynamic Stability of Dry Gas Seals

Zhang,

Ding,

Wang

et al. 2024

Processes

View full text Add to dashboard Cite

Concerning the application of high-precision, enormous rotating equipment under harsh working conditions, the advantages of dry gas sealing technology are increasingly obvious. Herein, research on the dynamic stability of dry gas seals is reviewed based upon their operating mechanisms. The influence of the dry gas seal structure, vibration response, and dynamic followability on the reliability of the shaft end sealing system of rotating machinery is the focus of current dry gas sealing technology. This work reviews the research history; analyzes the key coefficient of the instability of the sealing system under external disturbances, and the existing research on stability models; discusses the influence of starting and stopping characteristics, working conditions, and groove parameters on the stability of dry gas seals; and points out the shortcomings in the existing research. In addition, potential developments in dynamic stability are proposed, including improving model accuracy, improving experimental techniques, or applying intelligent control and optimization methods to enhance the dynamic stability of the sealing system. Finally, the development prospects for dry gas sealing technology in intelligent monitoring and wide temperature range adaptations are discussed, and theoretical guidance for improving a dry gas seal system is provided.

show abstract

Section: Starting and Stopping Phasesmentioning

confidence: 99%

Research Progress on the Dynamic Stability of Dry Gas Seals

Zhang,

Ding,

Wang

et al. 2024

Processes

View full text Add to dashboard Cite

show abstract

“…The fractal dimension and the characteristic coefficients of the end-faces are shown as Table 2. The acoustic emission sensor can effectively characterize the opening characteristics of the seal during startup [35,36]. A dynamic pressure seal test setup was constructed to measure the acoustic emission signals and leakage during seal initiation.…”

Section: Model Validationmentioning

confidence: 99%

Study on the Evolution of Sealing Performance during the Start-Up Process of Dynamic Pressure Seals Based on Three-Dimensional Fractal Functions

Bi,

Li,

Zhang

et al. 2024

Machines

View full text Add to dashboard Cite

A model based on a three-dimensional fractal function is developed and used in conjunction with experiments to analyze the evolutionary pattern of sealing performance during the start-up process of dynamic pressure seals, and the influence of end-face microscopic features on the evolution law is discussed. It is found that the opening state of the seal is divided into three stages: the non-opened stage, transition stage, and full-opened stage. The isotropic dimensions of the cavities have a coupling effect on the leakage, and they diminish as the speed increases. In order to enhance the sealing performance during start-up, it is suggested that the seal faces have a fractal dimension of 2.4 to 2.6, and a characteristic factor of less than 1 × 10−9 m.

show abstract

“…Acoustic emission (AE) testing, as an online nondestructive monitoring technology, has demonstrated high sensitivity to the tribological behavior of rotating machinery, including turbines [9][10][11], bearings [12][13][14][15], and dry gas seals [16,17]. Because AE sensors detect the actual mechanism of acoustic emission sources, AE technology is highly favored in the field of state monitoring and fault diagnosis of rotating machinery [18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Fault Diagnosis of Dry Gas Seal Operation Status Based on Acoustic Emission Monitoring

Ding,

Yu,

Liu

et al. 2024

Lubricants

View full text Add to dashboard Cite

A dedicated test bench is employed to record acoustic emission signals from dry gas seals under various operating conditions. Time-domain and frequency-domain analysis methods are utilized to process and analyze the acoustic emission signals during start/stop, stable operation, and two common fault states (end-face defects and compensation spring failure). Furthermore, feature recognition research is conducted. A method for identifying the operational states of seals (low-speed friction, gradual detachment, stable operation) based on the root mean square (RMS) was established, with transition points at speeds of 100 and 1000 RPM, respectively. Additionally, spectral analysis is conducted using Fourier transform to determine the frequency band of acoustic emission signals (240–320 kHz) generated during contact wear of dry gas seals. Investigation into two typical faults of dry gas seals reveals that the RMS value of the acoustic emission signal gradually increases with the rotational speed during the operation of dry gas seal end-face defects. This is attributed to the insufficient dynamic pressure effect on the end face, resulting in long-term wear and tear. When the dry gas seal compensates for spring failure, the RMS value of the acoustic emission signal initially increases, then decreases, and finally increases again as the speed increases. It reaches the stable operating inflection point when the end-face speed is 800 r/min.

show abstract

Face grooves for state monitoring in dry gas seals

Cited by 3 publications

References 36 publications

Research Progress on the Dynamic Stability of Dry Gas Seals

Research Progress on the Dynamic Stability of Dry Gas Seals

Study on the Evolution of Sealing Performance during the Start-Up Process of Dynamic Pressure Seals Based on Three-Dimensional Fractal Functions

Fault Diagnosis of Dry Gas Seal Operation Status Based on Acoustic Emission Monitoring

Contact Info

Product

Resources

About