CN107152368B - A kind of hydraulic turbine guide vane shear pin cutting signal detection system - Google Patents

Abstract

The invention relates to a shearing signal detection system for guide vane shear pins of a hydraulic turbine, comprising a shearing pin shearing signal sensor, a shearing pin detection relay, a failure shearing pin number display module, and an alarm module. The shearing pin shearing signal sensor is installed on a friction device of a water turbine unit , the number of shear pin shear signal sensors is the same as that of shear pins, the normally open contacts of each shear pin shear signal sensor are connected to the fault shear pin number display module, and the normally closed contacts are connected in series to the excitation circuit of the shear pin detection relay, and the shear pin The normally closed auxiliary contact of the detection relay is connected to the alarm module; the hydraulic turbine guide vane shear pin shear signal detection system provided by the present invention detects the working state of the shear pin by setting the shear pin shear signal sensor, and by setting the failure shear pin number display module and corresponding The connecting circuit realizes the number display of fault shearing pins, without troubleshooting, the fault guide vane can be directly located, and the defect processing time is greatly shortened.

Description

A shearing signal detection system for hydraulic turbine guide vane shearing pins

technical field

The invention relates to a shearing signal detection system of a guide vane shear pin of a water turbine, which is suitable for detecting whether a shear pin of a movable guide vane of a water turbine in a hydropower station is cut, and belongs to the technical field of detection systems of a hydropower station.

Background technique

The water turbine in the hydropower plant is equipped with multiple movable guide vanes, which play the role of regulating flow and forming circulation. Referring to Fig. 1, the shearing pin 200 is installed in the friction device 500 of the movable guide vane 400 and the pin hole on the crank arm 300, and each movable guide vane 400 is equipped with a shearing pin 200, under normal circumstances, the guide vane is in the process of action, The shearing pin 200 has sufficient strength to drive the guide vane arm 300 to rotate. When the guide vane is stuck by a foreign object, the guide vane shaft and the guide vane arm 300 cannot rotate, and the friction device 500 is driven by the control ring through the connecting plate 600 to continue to rotate. Therefore, a shear force is generated on the shear pin, the shear pin is sheared, and the guide vane is out of control.

When the shearing pin is cut off, the computer monitoring system of the power station should trigger a corresponding alarm message. The operation and maintenance personnel of the power station need to check the shearing pin cutting situation on site. Due to the large number of shearing pins, some large power plants have as many as 20 guide vanes. As mentioned above, the existing shearing pin shearing signal detection system can only judge whether a shearing pin has been sheared, but cannot locate the position of the damaged shearing pin, which brings great inconvenience to maintenance.

Contents of the invention

The purpose of the present invention is to overcome the deficiencies of the existing shearing pin shearing signal detection system, and provide a hydraulic turbine guide vane shearing pin shearing signal detection system that can accurately display the number of the sheared shearing pin, which is convenient for operation and maintenance personnel to quickly handle faults, Improve the work efficiency of operation and maintenance personnel.

The technical solution adopted to realize the object of the present invention is, a hydraulic turbine guide vane shearing pin shearing signal detection system, comprising a shearing pin shearing signal sensor, a shearing pin detection relay, a failure shearing pin number display module and an alarm module, and a shearing pin shearing signal sensor The number is the same as that of the shearing pin; the shearing pin shearing signal sensor is composed of a shell and a pressure column packaged in the shell, a spring, 2 pieces of conductor shrapnel and 2 pairs of contacts, and the spring is fixed in the spring groove opened at the bottom of the inner cavity of the shell , the bottom of the pressure column is connected to the spring, and the top protrudes from the shell. Two pairs of contacts are distributed on the upper and lower sides of the inner cavity of the shell. Two pieces of conductor shrapnel are installed on the pressure column in parallel. The contacts form a normally closed contact. The conductor shrapnel on the lower side is located above a pair of contacts on the lower side to form a normally open contact. The normally open contacts of each shear pin shear signal sensor are connected to the fault shear pin number display module. 1. The normally closed contact is connected in series to the coil excitation circuit of the shear pin detection relay, and the normally closed auxiliary contact of the shear pin detection relay is connected to the alarm module; the shear pin shear signal sensor is installed on the friction device of the hydraulic turbine and is close to the guide The blade end cover and the edge of the guide vane end cover are provided with a pressure groove matching the shape of the end of the pressure column protruding from the casing, and the end of the pressure column protruding from the casing extends into the pressure groove.

The alarm module includes a shear pin failure indicator light and a buzzer, and the normally closed auxiliary contacts of the shear pin detection relay are respectively connected to the working circuit of the shear pin failure indicator light, the buzzer working circuit and the electrical alarm circuit of the turbine monitoring system.

The fault shear pin serial number display module is powered by 220V DC, and includes more than two input contacts, and the normally open contacts of each shear pin shear signal sensor are respectively connected to corresponding input contacts.

The fault shear pin number display module has an internal integrated register, and each input contact is connected to the register, and the control unit of the fault shear pin number display module retrieves data from the register and displays them cyclically through the display screen of the fault shear pin number display module.

It can be seen from the above technical solution that the hydraulic turbine guide vane shear pin shear signal detection system provided by the present invention installs a shear pin shear signal sensor next to each shear pin to detect the working state of the shear pin, and the shear pin shear signal sensor is installed on The friction device of the water turbine unit is close to the guide vane end cover, and the end is a contact. Since the shear pin connects the guide vane crank arm and the friction device, under normal circumstances, the shear pin shear signal sensor and the guide vane rotate together, and the internal contact is connected. The breaking situation remains unchanged. When the guide vane is stuck by foreign matter, the friction device continues to rotate without being affected, forming a shearing force, cutting off the shear pin, separating the movement of the arm of the guide vane and the friction device, and cutting the contact of the signal sensor by the shear pin. Breaking away from the pressure groove provided on the edge of the guide vane end cover, the on-off status of the internal contact changes, triggering an alarm.

The normally open contacts of each shear pin shear signal sensor are connected to the fault shear pin number display module. The number display module receives the signal from the shear pin shear signal sensor and displays it. At the same time, the alarm module alarms to remind the operation and maintenance personnel that the shear pin is sheared. The operation and maintenance personnel can quickly locate it according to the number displayed by the fault shear pin number display module. The water turbine where the fault shear pin is located can be repaired.

Compared with the prior art, the hydraulic turbine guide vane shear pin shear signal detection system provided by the present invention detects the working state of the shear pin by setting the shear pin shear signal sensor, and realizes the fault shear by setting the fault shear pin number display module and the corresponding connection circuit. Pin number display, without troubleshooting, can directly locate the faulty guide vane, greatly shortening the defect processing time.

Description of drawings

Fig. 1 is the first installation structure diagram of the shear pin shear signal sensor in the hydraulic turbine guide vane shear pin shear signal detection system provided by the present invention.

Fig. 2 is the second installation structure diagram of the shear pin shear signal sensor in the hydraulic turbine guide vane shear pin shear signal detection system provided by the present invention.

Fig. 3 is an overall structure diagram of a shear pin shear signal sensor in a shear pin shear signal detection system for a hydraulic turbine guide vane provided by the present invention.

Fig. 4 is a circuit diagram of a shearing signal detection system for a hydraulic turbine guide vane shearing pin provided by the present invention.

Fig. 5 is an internal structure diagram of a shear pin shear signal sensor in the shear pin shear signal detection system of a hydraulic turbine guide vane provided by the present invention.

Fig. 6 is a diagram showing the use status of the shear pin shear signal sensor in the hydraulic turbine guide vane shear pin shear signal detection system provided by the present invention.

Among them, 100-shearing pin shearing signal sensor, 200-shearing pin, 300-swing arm, 400-guide vane, 500-friction device, 600-connecting plate, 700-guide vane end cover, 800-failure shearing pin number display module , 900-alarm module, 1000-cutting pin detection relay, 1100-electrical alarm circuit; 11-shell, 12-contact, 13-pressure column, 14-spring, 15-conductor shrapnel, 16-contact, 17-spring Groove; 91-cutting pin fault indicator light, 92-buzzer.

Detailed ways

The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments, and the content of the present invention is not limited to the following embodiments.

Referring to Fig. 1, Fig. 2 and Fig. 4, a hydraulic turbine guide vane shear pin shear signal detection system includes a shear pin shear signal sensor FC100, a shear pin detection relay 1000, a failure shear pin number display module 800 and an alarm module 900, the shear pin The shear signal sensor FC100 has the same quantity as the shear pin 200;

Referring to Figure 3 and Figure 5, the shear pin shearing signal sensor FC100 is composed of a housing 11, a pressure column 13 packaged in the housing 11, a spring 14, 2 pieces of conductor shrapnel 15 and 2 pairs of contacts 16, and the spring 14 is fixed to the housing 11 In the spring groove 17 opened at the bottom of the inner cavity, the bottom end of the pressure column 13 is connected with the spring 14, and the top end protrudes from the shell 11 to form a contact 12. Two pairs of contacts 16 are distributed on the upper and lower sides of the inner cavity of the shell 11. Two pieces The conductor shrapnel 15 are installed in parallel on the pressure column 13, the upper conductor shrapnel contacts the pair of contacts a/b on the upper side to form a normally closed contact, and the lower conductor shrapnel 15 is located at the lower pair of contacts c/ Above d, it constitutes a normally open contact;

Referring to Fig. 1 and Fig. 2, the shear pin shearing signal sensor FC100 is installed on the friction device 500 of the water turbine unit and is close to the guide vane end cover 700. The matched pressure groove, the contact 12 is spherical and extends into the pressure groove;

Referring to Figure 4, the alarm module 900 includes a shear pin fault indicator light 91 and a buzzer 92, and the normally open contacts c/d of each shear pin shear signal sensor FC100 are connected to the fault shear pin number display module 800, normally closed Contacts a/b are connected in series to the excitation circuit of the shear pin detection relay 1000, and the normally closed auxiliary contacts K1, K2, and K3 of the shear pin detection relay 1000 are respectively connected to the working circuit of the shear pin fault indicator light 91 and the buzzer 92 to work Electrical alarm circuit 1100 of the hydraulic turbine monitoring system equipped with the circuit and the hydraulic turbine unit of the hydropower plant;

In this embodiment, the failure shear pin number display module 800 is powered by 220V DC, and has 30 input contacts in1-30 in total. The fault shear pin number display module 800 has an internal integrated register, and each shear pin cuts the normally open contact of the signal sensor FC100 c/d are respectively connected to the corresponding input contacts, each input contact is connected to the register, and the control unit of the fault shear pin number display module 800 retrieves data from the register and circulates through the display screen of the fault shear pin number display module 800 show.

In actual use, under normal circumstances, the shear pin is not cut, the friction device and the guide vane rotate together, the normally open contact c/d of the shear pin shear signal sensor FC100 is separated, and the normally closed contact a/b is closed, so that the fault shear pin number The display module 800 displays "00", and at the same time the coil KM of the shear pin detection relay 1000 is energized, its normally closed auxiliary contacts K1, K2, K3 are all disconnected, and the whole system has no alarm signal.

When the shear pin is cut, the normally open contact c/d of the shear pin shear signal sensor FC100 is closed, and the normally closed contact a/b is separated, because the normally open contact of each sensor is connected to the fault shear pin number display one by one through the cable Module 800, the shear pin shear signal sensor FC100 corresponding to the faulty shear pin will send a signal to the register, which corresponds to the number of the shear pin one by one, and the register temporarily stores all the signals received within a certain period of time, and the fault shear pin number display module The control unit of 800 retrieves the above-mentioned signals from the register, and displays the serial number of the faulty shearing pin through the display screen of the faulty shear pin number display module 800. At the same time, since the normally closed contact a/b is separated, the shearing pin detection The coil KM of the relay 1000 is deenergized and demagnetized, and its normally closed auxiliary contacts K1, K2, and K3 are all closed, respectively triggering the flashing of the shear pin fault indicator light 91, the sound of the buzzer 92, and the alarm of the electrical alarm circuit of the hydro turbine monitoring system of the power station , to remind the operation and maintenance personnel that the shearing pin is sheared, and the operation and maintenance personnel can quickly locate the turbine where the faulty shearing pin is located according to the number displayed by the faulty shearing pin number display module, so as to carry out maintenance.

Claims (4)

1. a kind of hydraulic turbine guide vane shear pin cuts signal detection system, including break pin cuts signal transducer, break pin inspection Relay and alarm module are surveyed, it is identical as break pin quantity that break pin cuts signal transducer, it is characterised in that：It further include event Hinder break pin number display module；The break pin cuts signal transducer by shell and the compression leg being packaged in shell, bullet Spring, 2 conductor shell fragments and 2 pairs of contacts are constituted, and spring is fixed in the spring groove that shell inner cavity bottom of chamber opens up, compression leg bottom end and bullet Spring connection, top protrude from shell, and 2 pairs of contacts are distributed in the both sides up and down of shell inner cavity, and 2 conductor shell fragments are parallelly mounted to press On column, a pair of contact of the conductor shell fragment contact upside of upside constitutes normally-closed contact, the conductor shell fragment of downside is located at the one of downside To above contact, constituting normally opened contact, the normally opened contact that each break pin cuts signal transducer accesses failure break pin number The coil magnetization circuit of display module, normally-closed contact series connection access break pin detection relay, break pin detect the normal of relay Close auxiliary contact access alarm module；The break pin cut signal transducer be installed on the rubbing device of water turbine set and Close to guide vane end cap, the edge of guide vane end cap has the indent that the shape for the end for protruding from shell with compression leg matches, and presses The end that column protrudes from shell is stretched into indent.

2. hydraulic turbine guide vane shear pin according to claim 1 cuts signal detection system, it is characterised in that：The alarm Module includes break pin malfunction indicator lamp and buzzer, and the normally closed auxiliary contact of break pin detection relay is respectively connected to break pin The electrical alarm circuit of malfunction indicator lamp performance loop, buzzer performance loop and hydraulic turbine monitoring system.

3. hydraulic turbine guide vane shear pin according to claim 1 cuts signal detection system, it is characterised in that：The failure Break pin number display module is with 220V direct current supplys, including 2 or more input contact, and each break pin cuts signal transducer Normally opened contact is respectively connected to corresponding input contact.

4. hydraulic turbine guide vane shear pin according to claim 3 cuts signal detection system, it is characterised in that：The failure Break pin number display module is internally integrated register, and register is accessed in each contact that inputs, and failure break pin number shows mould The control unit of block from register called data and pass through the display screen of failure break pin number display module cycle display.