A kind of displacement alarm for monitoring vertical water turbine top cover

Abstract

The present application belongs to the technical field of water turbine vibration monitoring, and particularly relates to a vertical water turbine top cover displacement monitoring alarm, which comprises a monitoring device and a monitoring terminal. The monitoring device is arranged between the top cover and the pit wall. The monitoring device comprises a first fixed connecting plate, a second fixed connecting plate, a cylindrical pin and a signal indicator. The first fixed connecting plate and the second fixed connecting plate are arranged in an up-down manner and are spaced apart by a certain distance. One end of the first fixed connecting plate is fixed to the top cover, and the other end is provided with a first through hole. One end of the second fixed connecting plate is fixed to the pit wall, and the other end is provided with a second through hole. The first through hole and the second through hole are coaxial. The cylindrical pin penetrates through the first through hole and the second through hole. The cylindrical pin is hollow, and the hollow part is provided with the signal indicator. The signal indicator is in communication connection with the monitoring terminal. The present application has high reliability, can avoid false alarms or errors of existing vibration sensors, and can avoid false alarms or equipment malfunctions caused by human errors.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of water turbine vibration monitoring, and particularly relates to a vertical water turbine top cover displacement monitoring alarm. BACKGROUND

[0002] The water turbine top cover is an important component in the water turbine generator set and is an important component of the water guide mechanism of the set. The top cover, the spiral case, the guide vane and the seat ring jointly form an annular space to guide water flow into the runner to generate electricity. Due to the large water pressure between the top cover and the runner during the operation of the set and the continuous change of the water pressure during the operation, vibrations of different degrees are generated, which affect the safety of the top cover.

[0003] At present, the monitoring device of the top cover in a medium and large-sized hydropower plant is to install vibration sensors in the horizontal and vertical directions of the top cover, and then transmit the sensor monitoring data to a vibration device for monitoring and accident shutdown. The main core component of the monitoring device is the vibration sensor, which is installed at the top cover rack part and senses the vibration of the installed part through the internal measuring device, rather than directly measuring the relative displacement value of the top cover with a relatively fixed point (such as the pit wall), so that the measured value has an error. Moreover, due to the relatively complex internal structure, sensor failure false alarm or large monitoring data deviation often occurs in actual use, causing equipment false alarm and set malfunction, so many power plants use the monitoring device for fault alarm, but not for set accident shutdown. This brings great hidden dangers to the safe operation of the set. Once the top cover fixing bolt is broken and the top cover is flooded, a hydropower station accident will occur. SUMMARY

[0004] In view of this, the purpose of the present application is to provide a vertical water turbine top cover displacement monitoring alarm, which aims to solve the problems of false alarm and data collection deviation of the existing top cover monitoring device.

[0005] In order to achieve the above purpose, the technical scheme adopted by the present application is as follows:

[0006] A vertical water turbine top cover displacement monitoring alarm comprises a monitoring device and a monitoring terminal, the monitoring device is arranged between the top cover and the pit wall, the monitoring device is in communication connection with the monitoring terminal, the monitoring device comprises a first fixed connection plate, a second fixed connection plate, a cylindrical pin and a signaler, the first fixed connection plate and the second fixed connection plate are arranged in an up-down manner and are spaced apart by a certain distance, one end of the first fixed connection plate is fixed on the top cover, and the other end is provided with a first through hole, one end of the second fixed connection plate is fixed on the pit wall, and the other end is provided with a second through hole, the first through hole and the second through hole are coaxial, the cylindrical pin penetrates through the first through hole and the second through hole, the cylindrical pin is hollow, and the hollow part is provided with the signaler, and the signaler is in communication connection with the monitoring terminal.

[0007] The cylindrical pin comprises a first vertical part, a shearing part and a second vertical part, the first vertical part is arranged in the first through hole, the shearing part is arranged between the first through hole and the second through hole, and the second vertical part is arranged in the second through hole, the shearing part is funnel-shaped, the opening of the large head of the funnel-shaped shearing part is large circular, the diameter of the large circular is the same as the outer diameter of the cylindrical pin, and the large circular is connected with the first vertical part, and the opening of the small head of the funnel-shaped shearing part is small circular, the diameter of the small circular is the same as the inner diameter of the cylindrical pin, and the small circular is connected with the second vertical part.

[0008] Further, the strength of the first fixed connecting plate and the second fixed connecting plate is higher than that of the cylindrical pin.

[0009] Further, a baffle limiting the movement of the signaler is arranged at the bottom of the cylindrical pin.

[0010] Further, the thickness of the shearing part is 0.5-2mm.

[0011] Further, the signaler is a signaler for a water turbine guide vane shearing pin.

[0012] Further, the top cover is arranged perpendicularly to the cylindrical pin, and monitoring devices are uniformly arranged around the top cover.

[0013] Further, the monitoring terminal is connected with a plurality of alarms, the alarms are in communication connection with the monitoring terminal, and each alarm corresponds to a monitoring device.

[0014] The present application has the following beneficial effects:

[0015] The vertical water turbine top cover displacement alarm can form a rigid connection structure between the top cover and the pit wall through the first fixed connecting plate, the second fixed connecting plate and the cylindrical pin, when the top cover is displaced or misaligned, the cylindrical pin is sheared, the signaler in the cylindrical pin is sheared, and then an accident signal is sent. The present application has high reliability, can avoid false alarms or errors of the existing vibration sensor, and can avoid false alarms of the unit or malfunctions of the equipment caused by human errors. Moreover, through the rapid feedback of the internal electrical signal, alarm and accident handling information can be sent in time, the reliability and sensitivity of the present application are improved, and the safety of the equipment is improved. Moreover, the present application can be connected to the accident shutdown process of the unit, and is used for emergency closing of the guide vane and closing of the inlet accident door when the top cover has a water leakage accident, so as to prevent the accident from expanding. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to make the technical solutions in the embodiments of the present application or the prior art clearer, the accompanying drawings needed in the embodiments or prior art description will be briefly introduced. Obviously, the accompanying drawings in the following description only show some embodiments of the present application, and other drawings can be obtained by those of ordinary skill in the art without any creative effort based on these drawings.

[0017] Figure 1 is a vertical water turbine top cover displacement alarm of the present application;

[0018] Figure 2 is a structure diagram of the monitoring device provided on the top cover in the present application;

[0019] Figure 3 is Figure 2 is a structure diagram of the monitoring device in the structure shown in the present application;

[0020] Figure 4 is Figure 3 is a front view of the structure shown in the present application;

[0021] Figure 5 is Figure 3 is a structure diagram of the cylindrical pin involved in the present application;

[0022] Figure 6 is Figure 5 is a structure diagram of the shear cut part involved in the present application. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without any creative effort belong to the scope of protection of the present application.

[0024] The monitoring device of the top cover in the existing large hydropower plant is to install a vibration sensor in the horizontal and vertical directions of the top cover, to sense the vibration of the installed part through the internal measuring device, and to measure the relative displacement value of the top cover directly through the displacement value with a relatively fixed point (such as the pit wall), so that the measurement value has an error. Moreover, due to the relatively complex internal structure, the sensor often fails to report an alarm or the monitoring data deviates in actual use, which causes the equipment to report an alarm and the unit to malfunction.

[0025] The inventor of the present application provides a vertical water turbine top cover displacement alarm for monitoring the above problems, which forms a rigid connection structure between the top cover and the pit wall by being provided with a first fixed connecting plate, a second fixed connecting plate and a cylindrical pin; and a signaler is arranged in the cylindrical pin, when the top cover is displaced or misaligned, the cylindrical pin is cut off, so that the signaler inside the cylindrical pin is cut off, and thus an accident signal is sent. The present application has high reliability, can avoid false alarms or errors of existing vibration sensors, and avoid unit false alarms or equipment misoperation problems caused by human error.

[0026] As shown in Figures 1-6 A vertical water turbine top cover displacement alarm for monitoring, which comprises a monitoring device 1, a monitoring terminal 2 and an alarm 3. The monitoring device 1 is arranged between the top cover 4 and the pit wall 5, the monitoring device 1 is in communication connection with the monitoring terminal 2, and the number of the alarm 3 corresponds to the number of the monitoring device 1 and is in communication connection with the monitoring terminal 2.

[0027] The monitoring device 1 comprises a first fixed connecting plate 6, a second fixed connecting plate 7, a cylindrical pin 8 and a signaler 9.

[0028] The first fixed connecting plate 6 and the second fixed connecting plate 7 are arranged in an up-down manner and are spaced apart by a certain distance, one end of the first fixed connecting plate 6 is fixed on the top cover 4, the other end is provided with a first through hole 601, one end of the second fixed connecting plate 7 is fixed on the pit wall 5, the other end is provided with a second through hole 701, and the first through hole 601 and the second through hole 701 are coaxial, the cylindrical pin 8 penetrates through the first through hole 601 and the second through hole 701, the cylindrical pin 8 is hollow, and the hollow part is provided with the signaler 9, the signaler 9 is in communication connection with the monitoring terminal 2, and a baffle 10 is arranged at the bottom of the cylindrical pin 8 to limit the movement of the signaler 9 and prevent the signaler 9 from falling. The signaler 9 is a commonly used signaler for water turbine guide vane shear pins on the market, which is convenient for daily maintenance and procurement; the size of the cylindrical pin 8 can be adjusted according to the size of the signaler 9, and monitoring devices 1 of different specifications and models can be designed and manufactured.

[0029] According to the working characteristics of the vertical water turbine generator set top cover, when the top cover 4 fixing bolt fails to displace, it is generally in the vertical direction of the top cover 4, and the cutting direction of the cylindrical pin 8 is vertical, therefore, the monitoring device 1 is installed in the horizontal direction of the top cover 4; and in order to improve the reliability of monitoring, the monitoring device 1 is installed in four directions symmetrically around the circumference of the top cover 4, which ensures full coverage of each direction of the top cover 4 in operation.

[0030] The first fixed connecting plate 6 and the second fixed connecting plate 7 can be fixed on the top cover 4 and the pit wall 5 by welding or bolts to form a rigid connection structure of the top cover 4 and the pit wall 5. During installation, the first through hole 601 and the second through hole 701 are aligned, then the cylindrical pin 8 precisely matched with the first through hole 601 and the second through hole 701 is inserted, and the signal indicator 9 is arranged in the hollow part of the cylindrical pin 8.

[0031] In order to ensure that the whole has sufficient strength and rigidity, the strength and installation strength of the first fixed connecting plate 6 and the second fixed connecting plate 7 are greater than the strength of the shear cut of the cylindrical pin 8, and the first fixed connecting plate 6 and the second fixed connecting plate 7 are made of a material with higher strength than the cylindrical pin 8, such as 20# or Q345 commonly used steel; in order to ensure that the cylindrical pin 8 is sheared when the top cover 4 is displaced, the cylindrical pin 8 is made of steel with a material of Q235.

[0032] Based on the above embodiment, the cylindrical pin 8 includes a first vertical part 801, a shear cut part 802 and a second vertical part 803, the first vertical part 801 is arranged in the first through hole 601, the shear cut part 802 is arranged between the first through hole 601 and the second through hole 701, and the second vertical part 803 is arranged in the second through hole 701, the shear cut part 802 is funnel-shaped, the opening of the large head of the funnel-shaped shear cut part 802 is a large circle, the diameter of the large circle is the same as the outer diameter of the cylindrical pin 8, and the large circle is connected with the first vertical part 801, the opening of the small head of the funnel-shaped shear cut part 802 is a small circle, the diameter of the small circle is the same as the inner diameter of the cylindrical pin 8, and the small circle is connected with the second vertical part 803; in order to improve the reliability of the sheared cylindrical pin 8, the thickness of the shear cut part 802 is designed to be between 0.5-2mm according to the size of the unit.

[0033] When the fixing bolts of the unit top cover 4 are loose or broken, the top cover 4 is displaced or misaligned, the shear cut of the cylindrical pin 8 in the monitoring device 1 is sheared, the signal indicator 9 arranged in the cylindrical pin 8 is sheared, and then an accident signal is sent, therefore, the monitoring device 1 has high reliability, can avoid false reports or errors of existing vibration sensors, and can avoid unit false alarms or equipment misoperation problems caused by human error.

[0034] The monitoring terminal 2 is a common intelligent terminal, which is in communication connection with the signal indicators 9 of all monitoring devices 1, the signal indicators 9 send a sheared signal after being sheared, and transmit the sheared signal to the monitoring terminal 2, the monitoring terminal 2 receives the sheared signal and knows that the top cover 4 is displaced or misaligned; the monitoring terminal 2 can display whether the displacement or misalignment occurs at the monitoring position of each monitoring device 1 in real time.

[0035] The alarm 3, which is a common alarm indicator, is in communication connection with the monitoring terminal 2, and each alarm indicator corresponds to one monitoring device 1. When the monitoring terminal 2 receives the cutting signal, the monitoring terminal 2 sends an alarm signal to the alarm 3 corresponding to the monitoring device 1 sending the cutting signal, and the alarm 3 sends an alarm.

[0036] The monitoring device 1, the monitoring terminal 2 and the alarm 3 are in communication connection in the application. When the monitoring device 1 detects a fault, the alarm and the accident handling information can be sent in time through the rapid feedback of the internal electrical signal, the reliability and the sensitivity of the application are improved, and thus the safety guarantee of the equipment is also improved. The application can also be connected to the accident shutdown process of the unit, and is used for closing the guide vane and the intake accident door in an emergency when the water leakage accident occurs on the top cover, so as to prevent the accident from being expanded.

[0037] Finally, it should be noted that: the above only describes the preferred embodiments of the application and is not used to limit the application. Although the application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments or make equivalent replacements to some technical features, and any modification, equivalent replacement, improvement, etc. within the spirit and principles of the application should be included in the protection scope of the application.

Claims

1. An alarm device for monitoring the displacement of the top cover of a vertical water turbine, comprising monitoring devices and a monitoring terminal, wherein there are several monitoring devices disposed between the top cover and the sump wall, and the monitoring devices are communicatively connected to the monitoring terminal, characterized in that, The monitoring device includes a first fixed connecting plate, a second fixed connecting plate, a cylindrical pin, and a signal device. The first and second fixed connecting plates are arranged vertically and spaced apart by a certain distance. One end of the first fixed connecting plate is fixed to the top cover, and the other end has a first through hole. One end of the second fixed connecting plate is fixed to the pit wall, and the other end has a second through hole. The first and second through holes are coaxial. The cylindrical pin passes through the first and second through holes. The cylindrical pin is hollow, and the hollow part is equipped with a signal device. The signal device is communicatively connected to the monitoring terminal. The cylindrical pin includes a first vertical part, a shearing opening, and a second vertical part. The first vertical part is located inside the first through hole, the shearing opening is located between the first and second through holes, and the second vertical part is located inside the second through hole. The shearing opening is funnel-shaped, with the larger end of the funnel-shaped opening having a large circular opening whose diameter is the same as the outer diameter of the cylindrical pin and connecting to the first vertical part. The smaller end of the funnel-shaped opening has a small circular opening whose diameter is the same as the inner diameter of the cylindrical pin and connects to the second vertical part. The strength of the first and second fixed connecting plates is higher than that of the cylindrical pin. There is a baffle at the bottom of the cylindrical pin to restrict the movement of the signal device. The thickness of the shearing opening is 0.5-2mm. The signal device is a signal device for cutting the guide vane shear pin of a water turbine. The top cover is perpendicular to the cylindrical pin, and monitoring devices are evenly arranged around the top cover. The monitoring terminal is connected to several alarms, which are communicatively connected to the monitoring terminal, and each alarm corresponds to one monitoring device.

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