The Experts below are selected from a list of 18 Experts worldwide ranked by ideXlab platform

Zhang Baojun - One of the best experts on this subject based on the ideXlab platform.

  • Carbon Ring Seal employing lst
    2015
    Co-Authors: Xiao Peipei, Zhang Baojun
    Abstract:

    The invention discloses a Carbon Ring Seal employing an LST. The Carbon Ring Seal employing the LST comprises a Carbon Ring and a Sealing cavity; the Carbon Ring is located in the Sealing cavity; the Carbon Ring and the Sealing cavity both sleeve a shaft or a shaft sleeve; micropores are formed in surface of the shaft or the shaft sleeve. The Carbon Ring Seal employing the LST has the characteristics that a series of laser micropores are formed in the surface of the shaft or the shaft sleeve in contact with the Carbon Ring; Carbon Ring Seal is borne under the dynamic pressure effect of the LST duRing running, so that the Carbon Ring is avoided direct contact with the shaft or the shaft sleeve, and the wear of the Carbon Ring and the shaft or the shaft sleeve can be decreased; the service life of the Carbon Ring is greatly prolonged while the Sealing performance is ensured.

Xiao Peipei - One of the best experts on this subject based on the ideXlab platform.

  • Carbon Ring Seal employing lst
    2015
    Co-Authors: Xiao Peipei, Zhang Baojun
    Abstract:

    The invention discloses a Carbon Ring Seal employing an LST. The Carbon Ring Seal employing the LST comprises a Carbon Ring and a Sealing cavity; the Carbon Ring is located in the Sealing cavity; the Carbon Ring and the Sealing cavity both sleeve a shaft or a shaft sleeve; micropores are formed in surface of the shaft or the shaft sleeve. The Carbon Ring Seal employing the LST has the characteristics that a series of laser micropores are formed in the surface of the shaft or the shaft sleeve in contact with the Carbon Ring; Carbon Ring Seal is borne under the dynamic pressure effect of the LST duRing running, so that the Carbon Ring is avoided direct contact with the shaft or the shaft sleeve, and the wear of the Carbon Ring and the shaft or the shaft sleeve can be decreased; the service life of the Carbon Ring is greatly prolonged while the Sealing performance is ensured.

Gutzwiller H. Leslie - One of the best experts on this subject based on the ideXlab platform.

  • Practical Use Of Rotordynamic Analysis And Troubleshooting Skills To Correct A Long-Term Synchronous Vibration Problem In An Overhung Turboblower.
    Texas A&M University. Turbomachinery Laboratories, 2002
    Co-Authors: Corbo, Mark A., Kuli, Thomas J., Gutzwiller H. Leslie
    Abstract:

    LecturePg. 17-28The two subject blowers operate in parallel to circulate wet chlorine gas. Both units had large synchronous vibrations that led to multiple beaRing failures. After simple rotordynamic studies failed to identify the problem, a comprehensive model that accounted for both the motor and blower was successful at identifying the problem as high sensitivity to unbalance loads due to an extremely lightly-loaded (less than one pound) condition at the blower’s inboard beaRing (refer to Gutzwiller and Corbo, 2011). Based on the results of the rotordynamic analysis, two changes were made to both units. The couplings were changed from disk to gear couplings, and the blower’s beaRings were changed from plain cylindrical to tilting-pad designs. After implementing these changes, unit “A” ran smoothly for a period of six weeks, in accordance with the predictions of the rotordynamic analysis, and it appeared to all that the problem was completely solved. However, when the “B” blower was then started up the two machines then commenced a three month period of operation in which each suffered from intermittent periods of high synchronous vibrations. DuRing this time, the following behavior traits, which can only be described as bizarre, were observed: 1. After a smooth startup, vibration increased to a high level after about one week. 2. The transition from low vibrations to high vibrations was almost instantaneous. Additionally, this transition was always accompanied by an axial motion of the blower rotor away from the active thrust beaRing. 3. The units appeared to be more likely to suffer high vibrations when both were running simultaneously. 4. Starting one machine might result in increased vibrations on the other, and shutting down a machine might lower vibrations on the other. 5. Someone observed that duRing a rainstorm the vibration levels decreased. (Note: the blowers are located outside.) Spraying water on the beaRings sometimes (but not always) had a similar effect. A task force of experts was then commissioned and an extensive troubleshooting effort commenced. Some of the potential root causes that were hypothesized included blower surging, starvation of the tilting-pad beaRings, thermally-induced misalignment, insufficient blower thrust, acoustic resonance, axial vibration, Seal rubbing, and Morton effects. After an extensive troubleshooting effort that included more rotordynamic analysis, beaRing flow analysis, blower thrust analysis, and extensive studying of orbit plots, spectrum plots, and vibration and temperature histories, the task force concluded that the most likely cause was rubbing at the blower’s Carbon Ring Seal. Accordingly, the Seal was disassembled and its locating pins were found to have come loose and generated a rub. Design changes were then implemented to provide better retention for the pins. The units were then restarted and it was verified that the modifications had finally eliminated the vibration problems. This paper shows how the combination of rotordynamic analysis and troubleshooting skills was employed to identify and generate corrective actions for two independent causes of high synchronous vibrations

Koutný Filip - One of the best experts on this subject based on the ideXlab platform.

  • Single Stage Steam Turbine
    Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2019
    Co-Authors: Koutný Filip
    Abstract:

    Tato diplomová práce se zabývá termodynamickým výpočtem, výpočtem uhlíkové ucpávky a integrované převodovky jednostupňové parní turbíny pro mechanický pohon. Rešeršní část práce pojednává o základním rozdělení parních turbín, pohonových turbínách, typu lopatkování a provedení parních ucpávek. V diskuzi je řešeno porovnání uhlíkových ucpávek s ucpávkami labyrintovými.This diploma thesis aims to thermodynamic calculation, Carbon Ring Seal calculation and integrated gearbox calculation of single stage mechanicl drive steam turbine. The theoretical part of this work presents general classification of steam turbines, mechanicl drive steam turbine, types of blading and design of turbine Seals. In the second part, we further discuss difference between Carbon and labyrinth packing.

Corbo, Mark A. - One of the best experts on this subject based on the ideXlab platform.

  • Practical Use Of Rotordynamic Analysis And Troubleshooting Skills To Correct A Long-Term Synchronous Vibration Problem In An Overhung Turboblower.
    Texas A&M University. Turbomachinery Laboratories, 2002
    Co-Authors: Corbo, Mark A., Kuli, Thomas J., Gutzwiller H. Leslie
    Abstract:

    LecturePg. 17-28The two subject blowers operate in parallel to circulate wet chlorine gas. Both units had large synchronous vibrations that led to multiple beaRing failures. After simple rotordynamic studies failed to identify the problem, a comprehensive model that accounted for both the motor and blower was successful at identifying the problem as high sensitivity to unbalance loads due to an extremely lightly-loaded (less than one pound) condition at the blower’s inboard beaRing (refer to Gutzwiller and Corbo, 2011). Based on the results of the rotordynamic analysis, two changes were made to both units. The couplings were changed from disk to gear couplings, and the blower’s beaRings were changed from plain cylindrical to tilting-pad designs. After implementing these changes, unit “A” ran smoothly for a period of six weeks, in accordance with the predictions of the rotordynamic analysis, and it appeared to all that the problem was completely solved. However, when the “B” blower was then started up the two machines then commenced a three month period of operation in which each suffered from intermittent periods of high synchronous vibrations. DuRing this time, the following behavior traits, which can only be described as bizarre, were observed: 1. After a smooth startup, vibration increased to a high level after about one week. 2. The transition from low vibrations to high vibrations was almost instantaneous. Additionally, this transition was always accompanied by an axial motion of the blower rotor away from the active thrust beaRing. 3. The units appeared to be more likely to suffer high vibrations when both were running simultaneously. 4. Starting one machine might result in increased vibrations on the other, and shutting down a machine might lower vibrations on the other. 5. Someone observed that duRing a rainstorm the vibration levels decreased. (Note: the blowers are located outside.) Spraying water on the beaRings sometimes (but not always) had a similar effect. A task force of experts was then commissioned and an extensive troubleshooting effort commenced. Some of the potential root causes that were hypothesized included blower surging, starvation of the tilting-pad beaRings, thermally-induced misalignment, insufficient blower thrust, acoustic resonance, axial vibration, Seal rubbing, and Morton effects. After an extensive troubleshooting effort that included more rotordynamic analysis, beaRing flow analysis, blower thrust analysis, and extensive studying of orbit plots, spectrum plots, and vibration and temperature histories, the task force concluded that the most likely cause was rubbing at the blower’s Carbon Ring Seal. Accordingly, the Seal was disassembled and its locating pins were found to have come loose and generated a rub. Design changes were then implemented to provide better retention for the pins. The units were then restarted and it was verified that the modifications had finally eliminated the vibration problems. This paper shows how the combination of rotordynamic analysis and troubleshooting skills was employed to identify and generate corrective actions for two independent causes of high synchronous vibrations