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Turbine speed adapter plate

A technology of steam turbine and adapter plate, which is applied to devices using electric/magnetic methods, etc., can solve problems such as difficulty in taking into account accuracy and reliability, and achieve the effect of avoiding inaccurate low-speed measurement.

Active Publication Date: 2017-10-24
HARBIN TURBINE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that the existing speed measurement sensors of steam turbines are limited by their respective functions, making it difficult to balance accuracy and reliability, and provide a speed adapter plate for steam turbines

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specific Embodiment approach 1

[0019] Specific implementation mode one: the following combination figure 1 with figure 2 Describe this embodiment, the steam turbine speed adapter board described in this embodiment includes a DC power supply 1, a first frequency-to-voltage converter 2, a second frequency-to-voltage converter 3, a high-selection circuit 4, a comparison circuit 5, and an inverter 6. The first relay 7 and the second relay 8,

[0020] DC power supply 1 is used to provide working power for the eddy current speed sensor;

[0021] The positive input end of the first frequency voltage converter 2 is connected to the pulse signal positive output end of the eddy current speed sensor, and the negative input end of the first frequency voltage converter 2 is connected to the pulse signal negative output end of the eddy current speed sensor;

[0022] The positive input end of the second frequency voltage converter 3 is connected to the positive output end of the unequal amplitude sine wave signal of th...

specific Embodiment approach 2

[0032] Specific implementation mode two: the following combination figure 2 This embodiment will be described. This embodiment will further describe the first embodiment. The voltage threshold set by the comparison circuit 5 is the corresponding voltage value when the steam turbine speed is 500 RPM.

[0033] When the speed is greater than 500 rpm, the two relays are controlled to lose power, the normally open contacts of the relays are disconnected, and the normally closed contacts are closed. At this time, the sine wave signal of the magnetoresistive speed sensor is output; When it is equal to 500 revolutions, the pulse signal of the eddy current speed sensor is output.

[0034] figure 2 As shown, the steam turbine eddy current speed sensor enters the first channel of the adapter board, the DC power supply of the eddy current speed sensor is provided by the steam turbine speed adapter board, and the steam turbine magnetoresistive speed sensor enters the second channel of t...

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Abstract

The utility model relates to a steam turbine rotational speed adapter plate, which belongs to the technical field of steam turbine rotational speed measurement. The invention aims to solve the problem that the existing speed measuring sensors of steam turbines are limited by their respective functions, making it difficult to balance accuracy and reliability. It includes a DC power supply, a first frequency voltage converter, a second frequency voltage converter, a high selection circuit, a comparison circuit, an inverter, a first relay and a second relay. The speed signal output by the sensor and the eddy current speed sensor will output a larger value through the high selection circuit. After comparing with the voltage threshold of the comparison circuit, the inverter is used to control the relay to be powered on or off according to the level signal of the comparison circuit. Output one speed signal. The invention is used for selecting and outputting the rotation speed signal obtained by the speed measuring sensor.

Description

technical field [0001] The invention relates to a speed adapter plate of a steam turbine and belongs to the technical field of speed measurement of a steam turbine. Background technique [0002] At present, there are two ways to measure the speed of the steam turbine. One way is to use a magnetoresistive speed sensor. Its advantages are that it does not need an external power supply, the sensor has a simple structure, is easy to install and use, and has high reliability. The disadvantage is that the sine wave induced at low speed The wave amplitude is small and susceptible to interference, resulting in inaccurate or impossible measurement of the turbine speed; another way is to use an eddy current speed sensor, which has the advantage of being able to output standard speed pulses within the effective range of the speed of the steam turbine from 0 to 3600RPM The signal, measurement and display unit can accurately measure the speed of the steam turbine. The disadvantage is tha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01P3/49
Inventor 王春月林守玉周明钢胡宁伊静
Owner HARBIN TURBINE
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