CN109139135B - Alarm device for preventing water supply pump LVDT universal joint of steam turbine from falling off - Google Patents
Alarm device for preventing water supply pump LVDT universal joint of steam turbine from falling off Download PDFInfo
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- CN109139135B CN109139135B CN201811255402.0A CN201811255402A CN109139135B CN 109139135 B CN109139135 B CN 109139135B CN 201811255402 A CN201811255402 A CN 201811255402A CN 109139135 B CN109139135 B CN 109139135B
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- universal joint
- lvdt
- valve adjusting
- falling
- travel switch
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 19
- 238000006073 displacement reaction Methods 0.000 claims abstract description 7
- 238000000034 method Methods 0.000 claims description 5
- 230000000007 visual effect Effects 0.000 claims description 4
- 230000001960 triggered effect Effects 0.000 claims description 3
- 238000005259 measurement Methods 0.000 description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D21/00—Shutting-down of machines or engines, e.g. in emergency; Regulating, controlling, or safety means not otherwise provided for
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Turbines (AREA)
Abstract
An alarm device for preventing the universal joint of the water feeding pump LVDT of the steam turbine from falling off. When the unit operates, the universal joint and the support connection on the valve adjusting rod are loosened and gradually withdrawn outwards due to various reasons such as uneven expansion of the valve adjusting and the LVDT, vibration of the valve adjusting and incorrect fixation of the LVDT feedback rod. The invention comprises a valve adjusting rod (1) of a steam turbine feed pump, wherein the valve adjusting rod is connected with a bracket (2), the bracket is connected with a universal joint (3) through a screw rod, the universal joint is connected with an LVDT displacement sensor (7), the bracket is connected with a switch fixing bracket (4), one end of the switch fixing bracket is provided with a travel switch (5), the travel switch is positioned on a straight line where the screw rod is positioned, the action distance of the travel switch is 1/3-1/4 of the length of the screw rod on the universal joint, and the travel switch sends a signal to a sound-light alarm logic unit for the falling-off of the pneumatic feed pump LVDT of the DCS system of an operator station. The invention is applied to the alarm device for the falling off of the universal joint.
Description
Technical field:
the invention relates to an alarm device for preventing a universal joint of a water supply pump LVDT of a steam turbine from falling off.
The background technology is as follows:
the current installed capacity of the big Tang Haer shore first thermal power plant is 2X 300MW, each unit is provided with 2 steam-driven water supply pumps, a valve actuating mechanism of the MDEH control system of the steam-driven water supply pumps is a closed-loop control device formed by a valve position servo valve control loop, and a valve displacement sensor (LVDT) which moves along with the valve converts a valve position signal into an electrical signal to serve as negative feedback of the servo control loop. When the valve position command signal output by the computer is equal to the valve position feedback signal, the valve is controlled at a certain position. The valve position feedback signal is a very important signal in the valve servo control loop, the reliability of which is directly related to the reliability of the closed loop control device. In order to ensure the reliability of displacement signal measurement, two LVDT redundancy measurements are generally adopted, a bracket on a valve adjusting rod is excessively connected with an LVDT feedback rod connecting piece by using a transverse connecting rod and a universal joint, and a feedback device moves along with a valve to play a role in measurement when the valve acts, and meanwhile, the parallelism of the LVDT feedback rod and the valve adjusting rod and the levelness of the transverse connecting rod of the LVDT feedback rod are also ensured.
However, this measurement has the following disadvantages: the steam turbine LVDT feedback connecting rod is directly installed and fixed on the feedback bracket, and the iron core connected with the LVDT and the inner wall of the coil are easy to generate radial friction due to vibration and other reasons, so that the iron core or the coil is worn out, and the tuning fluctuation is caused. The valve adjusting LVDT universal joint of the steam turbine of the steam feed pump is in threaded connection with a support on a valve adjusting rod, and various reasons such as uneven expansion of the valve adjusting valve and the LVDT, vibration of the valve adjusting valve, improper fixation of a LVDT feedback rod and the like can lead the universal joint to gradually and outwards withdraw from the support on the valve adjusting rod when the unit operates, and finally, the valve adjusting feedback device drops off the steam feed pump to stop at a rotating speed or stop at an overspeed of the unit.
The invention comprises the following steps:
in order to overcome the problems in the prior art, the invention aims to provide an alarm device for preventing a universal joint of a water feeding pump LVDT of a steam turbine from falling off.
The above object is achieved by the following technical scheme:
an alarm device for preventing a water supply pump LVDT universal joint of a steam turbine from falling off, which comprises the following components: the valve adjusting rod of the water feeding pump of the steam turbine is connected with a support, the support is connected with a universal joint through a screw rod, the universal joint is connected with an LVDT displacement sensor, the support is connected with a switch fixing support, one end of the switch fixing support is provided with a travel switch, the travel switch is arranged on a straight line where the screw rod is located, the action distance of the travel switch is 1/3-1/4 of the length of the screw rod on the universal joint, and the travel switch sends a signal to a sound-light alarm logic unit for the falling of the LVDT of the water feeding pump of the DCS system of the operator station.
According to the alarm method of the alarm device for preventing the water feeding pump LVDT universal joint of the steam turbine from falling off, when a production field unit operates, due to uneven expansion of the valve adjusting and the LVDT, vibration of the valve adjusting and incorrect fixation of the valve adjusting feedback rod, the valve adjusting feedback support or the support connection of the universal joint and the valve adjusting rod is loose, the universal joint gradually withdraws outwards, when the support connection of the universal joint and the valve adjusting rod is loose, the universal joint gradually withdraws outwards, the stroke switch is triggered to act, a signal is sent to an operator station DCS system steam feeding pump LVDT falling off alarm logic to trigger an audible and visual alarm signal, and operators are reminded to pay attention to and timely contact with overhaulers to check and treat loosening faults of the water feeding pump LVDT universal joint.
The invention has the beneficial effects that:
the invention can timely find the loosening condition of the universal joint in the LVDT feedback device and send out an acousto-optic signal to remind operators to pay attention to the moment in the operation of the pneumatic feed pump, and rapidly contact with the maintainer to process the moment, thereby avoiding the tripping of the pneumatic feed pump and even the shutdown accident of the whole machine set.
The invention is suitable for early warning before the valve adjusting feedback bracket or the universal joint falls off due to various reasons such as uneven expansion of the valve adjusting and the LVDT, vibration of the valve adjusting, improper fixation of the LVDT feedback rod and the like during the operation of the unit on the production site, and has the characteristics of strong anti-interference capability, accurate measurement, low equipment maintenance cost and the like.
According to the invention, a travel switch is arranged outside the universal joint, a travel switch action signal is sent to a pneumatic feed pump LVDT falling alarm logic of an operator station DCS system to trigger an audible and visual alarm signal, so that an operator is reminded to pay attention and timely contact with an maintainer to check and treat the loosening fault of the universal joint of the pneumatic feed pump LVDT.
The invention can be widely applied to other industries such as electric power, chemical industry and the like.
The invention comprises a travel switch for receiving the loosening signal of the LVDT universal joint, a fixed bracket of the travel switch and a sound-light alarm logic for the falling of the LVDT of the pneumatic feed pump in the DCS system of the operator station. A travel switch for receiving the loosening signal of the LVDT universal joint is fixed on a support, a high-strength fixing support is mounted on a valve rod support of the pneumatic feed pump through screws, the action distance of the travel switch can be adjusted to be 1/3-1/4 of the length of a screw rod on the universal joint, the travel switch signal is sent to a sound-light alarm logic of the falling-off of the LVDT of the pneumatic feed pump control system, and when a unit operates, the travel switch acts to send an alarm signal after the support connection on the universal joint and the valve rod is loosened to the adjusted action distance due to the reasons of valve adjusting vibration, the abnormal fixation of the LVDT feedback rod and the like, so that operators are reminded to pay attention to and timely contact with maintenance staff to check and process the loosening fault of the LVDT universal joint of the pneumatic feed pump.
Description of the drawings:
fig. 1 is a schematic structural view of the present invention. In the figure, 1 is a valve adjusting rod, 2 is a bracket, 3 is a universal joint, 4 is a switch fixing bracket, 5 is a travel switch, 6 is a transverse connecting rod, and 7 is an LVDT displacement sensor.
The specific embodiment is as follows:
example 1:
an alarm device for preventing a water supply pump LVDT universal joint of a steam turbine from falling off, which comprises the following components: the valve adjusting rod of the water feeding pump of the steam turbine is connected with a support, the support is connected with a universal joint through a screw rod, the universal joint is connected with an LVDT displacement sensor, the support is connected with a switch fixing support, one end of the switch fixing support is provided with a travel switch, the travel switch is arranged on a straight line where the screw rod is located, the action distance of the travel switch is 1/3-1/4 of the length of the screw rod on the universal joint, and the travel switch sends a signal to a sound-light alarm logic unit for the falling of the LVDT of the water feeding pump of the DCS system of the operator station. The support on the valve adjusting rod of the steam feed pump steam turbine is excessively connected with the LVDT feedback rod connecting piece through the transverse connecting rod and the universal joint, and the feedback device moves along with the valve to play a role in measurement when the valve moves, so that the parallelism of the LVDT feedback rod and the valve adjusting rod and the levelness of the transverse connecting rod of the LVDT feedback rod are guaranteed.
Example 2:
according to the alarm method of the alarm device for preventing the water feeding pump LVDT universal joint of the steam turbine from falling off, when a production field unit operates, due to uneven expansion of the valve adjusting and the LVDT, vibration of the valve adjusting and incorrect fixation of the valve adjusting feedback rod, the valve adjusting feedback support or the support connection of the universal joint and the valve adjusting rod is loose, the universal joint gradually withdraws outwards, when the support connection of the universal joint and the valve adjusting rod is loose, the universal joint gradually withdraws outwards, the stroke switch is triggered to act, a signal is sent to an operator station DCS system steam feeding pump LVDT falling off alarm logic to trigger an audible and visual alarm signal, and operators are reminded to pay attention to and timely contact with overhaulers to check and treat loosening faults of the water feeding pump LVDT universal joint.
Claims (2)
1. An alarm device for preventing a water supply pump LVDT universal joint of a steam turbine from falling off, which comprises the following components: the valve adjusting rod of the water feeding pump of the steam turbine is characterized in that; the valve adjusting rod is connected with the support, the support is connected with the universal joint through the screw rod, the universal joint is connected with the LVDT displacement sensor, the support is connected with the switch fixing support, a travel switch is installed at one end of the switch fixing support, the travel switch is located on a straight line where the screw rod is located, the action distance of the travel switch is 1/3-1/4 of the length of the screw rod on the universal joint, and the travel switch sends a signal to a pneumatic feed pump LVDT falling sound-light alarm logic unit of the DCS system of the operator station.
2. An alarm method of an alarm device for preventing a turbine feedwater pump LVDT universal joint from falling off according to claim 1, characterized by: when the production field unit operates, due to uneven expansion of the valve adjusting and the LVDT, vibration of the valve adjusting and improper fixation of the LVDT feedback rod, the valve adjusting feedback support or the universal joint is loose with the support on the valve adjusting rod, the universal joint gradually withdraws outwards, when the universal joint is loose with the support on the valve adjusting rod, the travel switch action is triggered when the universal joint gradually withdraws outwards, a signal is sent to the LVDT falling alarm logic of the pneumatic feed pump of the DCS system of the operator station to trigger the audible and visual alarm signal, and the operator is reminded to pay attention and timely contact with an maintainer to check and treat the loosening fault of the LVDT universal joint of the pneumatic feed pump.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811255402.0A CN109139135B (en) | 2018-10-26 | 2018-10-26 | Alarm device for preventing water supply pump LVDT universal joint of steam turbine from falling off |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811255402.0A CN109139135B (en) | 2018-10-26 | 2018-10-26 | Alarm device for preventing water supply pump LVDT universal joint of steam turbine from falling off |
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| Publication Number | Publication Date |
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| CN109139135A CN109139135A (en) | 2019-01-04 |
| CN109139135B true CN109139135B (en) | 2024-03-29 |
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| CN201811255402.0A Active CN109139135B (en) | 2018-10-26 | 2018-10-26 | Alarm device for preventing water supply pump LVDT universal joint of steam turbine from falling off |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111822579A (en) * | 2020-08-11 | 2020-10-27 | 沃得精机(中国)有限公司 | Reversible stretching pad structure for press machine |
| CN112377274B (en) * | 2020-10-22 | 2023-03-21 | 呼和浩特科林热电有限责任公司 | LVDT prevents fracture device and steam turbine |
| CN113531513B (en) * | 2021-07-28 | 2023-05-02 | 哈尔滨沃华智能电力技术有限公司 | Protection method of drum water level control system in case of failure of steam inlet valve of steam feed pump |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN205779040U (en) * | 2016-05-27 | 2016-12-07 | 河南华润电力古城有限公司 | A kind of feed pump turbine and LVDT thereof |
| CN106705822A (en) * | 2016-11-29 | 2017-05-24 | 中国神华能源股份有限公司 | Turbine valve stroke measuring device, turbine valve stroke monitoring system and turbine valve stroke monitoring method |
| CN206972317U (en) * | 2017-06-27 | 2018-02-06 | 河南华润电力首阳山有限公司 | A kind of feedback device suitable for feed pump turbine |
| CN208996774U (en) * | 2018-10-26 | 2019-06-18 | 大唐黑龙江发电有限公司哈尔滨第一热电厂 | The warning device for preventing steam turbine feed pump LVDT universal joint from falling off |
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2018
- 2018-10-26 CN CN201811255402.0A patent/CN109139135B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN205779040U (en) * | 2016-05-27 | 2016-12-07 | 河南华润电力古城有限公司 | A kind of feed pump turbine and LVDT thereof |
| CN106705822A (en) * | 2016-11-29 | 2017-05-24 | 中国神华能源股份有限公司 | Turbine valve stroke measuring device, turbine valve stroke monitoring system and turbine valve stroke monitoring method |
| CN206972317U (en) * | 2017-06-27 | 2018-02-06 | 河南华润电力首阳山有限公司 | A kind of feedback device suitable for feed pump turbine |
| CN208996774U (en) * | 2018-10-26 | 2019-06-18 | 大唐黑龙江发电有限公司哈尔滨第一热电厂 | The warning device for preventing steam turbine feed pump LVDT universal joint from falling off |
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| CN109139135A (en) | 2019-01-04 |
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