Large-axis peristaltic detection method applicable to power station unit

A technology for power station units and detection methods, which is applied in the direction of motor generator testing, the use of electrical devices, and the use of electromagnetic means, can solve problems such as hidden dangers in the operation of bearing bushes, and achieve the effect of advanced algorithms

Pending Publication Date: 2019-09-06
CHINA YANGTZE POWER
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0012] The purpose of the present invention is to provide a unit creep detection method, by accurately and effectively detecting the tiny creep of the unit, and

Method used

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  • Large-axis peristaltic detection method applicable to power station unit
  • Large-axis peristaltic detection method applicable to power station unit
  • Large-axis peristaltic detection method applicable to power station unit

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[0045] Examples:

[0046] Such as Figure 1 to 3 As shown, the number of speed measuring toothed belts and the number of empty slots of the main shaft of the Three Gorges Right Bank Harbin Power Generation Unit are both 80, the length of a single toothed belt: 50mm, the length of a single slot: 110mm, and the duty cycle is 0.31. The arc length of a toothed belt plus the arc length of an empty slot corresponds to the center angle of the major shaft:

[0047] φ=360° / 80=4.5°.

[0048] The angle of the center of the major axis corresponding to the arc length of a single sprocket: 4.5°*50 / 160=1.4°.

[0049] The angle of the center of the major axis corresponding to the arc length of a single slot:

[0050] 4.5°*110 / 160=3.1°.

[0051] After analysis and calculation, six probes must be installed, and the spacing of each probe is a multiple of 0.5° in order to meet the peristaltic requirements of the national standard. The identifiable domain of one cycle of the chainring is 0.5*2=1 degree (t...

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Abstract

A large-axis peristaltic detection method applicable to a power station unit is provided. The method comprises the following steps in use: 1) obtaining the respective number A of speed measuring toothed belts on a toothed disc and empty grooves in a power station unit speed control system, the length B of a single speed measuring toothed belt, and the length C of a single empty groove; 2)solving alarge-axis center angle value phi corresponding to the arc length of a toothed belt plus the arc length of an empty groove; 3) solving the large-axis center angle value corresponding to the arc length of a single toothed disc and the large-axis center angle value corresponding to the arc length of the single empty groove; and 4) determining the number of to-be-installed sensor probes through calculation, and arranging the sensor probes continuously around the toothed disc and at a distance D. In order to accurately, precisely and effectively monitor the peristaltic motion of a large-scale power station unit, the present invention provides a large-axis peristaltic detection method applicable to a power station unit.

Description

technical field [0001] The invention belongs to the field of power station units and their auxiliary equipment, and in particular relates to a large shaft creep detection method suitable for power station units. Background technique [0002] Unit creep detection device is one of the indispensable equipment for turbine automation. When the hydro-generator set is in the shutdown state, the movable guide vanes of the hydro-turbine are in the closed state. Due to the large number of guide vanes, there may be water leakage between the guide vanes. When the water leakage increases to a certain extent, the water flow impacts the turbine runner blades, which will cause the rotating parts of the unit to produce slow rotational motion, that is, the unit will creep. Phenomenon. The creep phenomenon of the unit is hidden, but it is a major hidden danger to the safe and stable operation of the turbine unit. If the creeping time of the main shaft of the unit is too long, it will easily ...

Claims

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Application Information

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IPC IPC(8): G01R31/34G01B7/30
CPCG01B7/30G01R31/34
Inventor 周立成白二邓友汉朱斌艾远高翟玉杰谭勇陈宇凡金笑笑李翰夫
Owner CHINA YANGTZE POWER
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