阅读说明：本技术 一种水轮发电机组接力器行程检测装置及系统 (Hydroelectric set servomotor stroke detection device and system ) 是由 龙增辉 郑治国 于 2021-08-05 设计创作，主要内容包括：本发明公开了一种水轮发电机组接力器行程检测装置及系统,包括接力器本体、可高度调节的支架、光纤光栅拉绳式位移传感器和光纤光栅解调器,所述接力器本体包括静止部件、伸缩部件和移动部件；本发明通过在接力器本体安装的机架上安装有支架,支架上安装有光纤光栅拉绳式位移传感器,通过光纤光栅拉绳式位移传感器、接力器本体与光纤光栅解调器的配合,便于精准检测接力器的位移距离,且支架安装在安装接力器本体安装的机架上,便于检测装置的安装,通过光纤光栅拉绳式位移传感器、光纤光栅解调器和显示屏形成位移检测系统,该系统结构简单,一定程度上提高导叶开度位置位置整定的精准度。(The invention discloses a stroke detection device and system for a servomotor of a hydroelectric generating set, which comprises a servomotor body, a bracket with adjustable height, a fiber grating stay cord type displacement sensor and a fiber grating demodulator, wherein the servomotor body comprises a static part, a telescopic part and a moving part; according to the invention, the bracket is arranged on the rack on which the servomotor body is arranged, the fiber bragg grating pull rope type displacement sensor is arranged on the bracket, the displacement distance of the servomotor is conveniently and accurately detected through the matching of the fiber bragg grating pull rope type displacement sensor, the servomotor body and the fiber bragg grating demodulator, the bracket is arranged on the rack on which the servomotor body is arranged, the detection device is conveniently arranged, and the displacement detection system is formed through the fiber bragg grating pull rope type displacement sensor, the fiber bragg grating demodulator and the display screen.)

1. The utility model provides a hydroelectric set servomotor stroke detection device, includes servomotor body (1), but height-adjusting's support (3), fiber grating stay cord formula displacement sensor (4) and fiber grating demodulator (6), its characterized in that: the servomotor body (1) comprises a moving part (101), a telescopic part (102) and a static part (103), the moving part (101) and the static part (103) are respectively located at two ends of the telescopic part (102), a support (3) is installed on a rack in the middle of the maximum displacement position of the static part (103) and the moving part (101) through bolts, an angle steel (2) is fixed on the outer wall of the moving part (101), a height adjusting mechanism is arranged on the support (3), a fiber grating stay cord type displacement sensor (4) is fixed on the support (3) through an expansion bolt, the fiber grating stay cord type displacement sensor (4) is connected with the angle steel (2) through a stay cord (402), a limiting mechanism for installing the fiber grating stay cord type displacement sensor (4) is arranged on the support (3), and the fiber grating stay cord type displacement sensor (4) is connected with a fiber grating demodulator (6) through an optical cable (5) .

2. The stroke detection device of the servomotor of the hydroelectric generating set according to claim 1, characterized in that: fiber grating stay cord formula displacement sensor (4) include casing (401), mounting groove (14) that supply expansion bolts to install are all seted up at casing (401) both ends, leading wheel (403) that supply stay cord (402) direction are installed to the one end of casing (401), the recess that supplies leading wheel (403) installation is seted up to the lateral wall of casing (401), and one of them mounting groove (14) are located the inside of recess.

3. The stroke detection device of the servomotor of the hydroelectric generating set according to claim 1, characterized in that: the support (3) comprises a base (301) and a supporting block (302), a screw (9) is rotatably connected to the upper surface of the base (301), one end of the screw (9) is in threaded connection with the lower end of the supporting block (302), a threaded blind hole for the screw (9) to be screwed is formed in the lower end of the supporting block (302), the supporting block (302) is connected with the base (301) through two telescopic rods (16), and the fiber bragg grating stay cord type displacement sensor (4) is installed on the supporting block (302).

4. The stroke detection device of the servomotor of the hydroelectric generating set according to claim 3, wherein: the height adjusting mechanism comprises an adjusting rod (12), an adjusting disc (10) is fixed at one end of the adjusting rod (12), an adjusting handle is fixed at one side of the adjusting disc (10), the other end of the adjusting rod (12) is rotatably connected with the upper surface of the base (301), and the adjusting rod (12) is in transmission connection with the screw rod (9) through a transmission mechanism.

5. The stroke detection device of the servomotor of the hydroelectric generating set according to claim 4, wherein: base (301) are the setting of T type, a plurality of mounting holes (15) have been seted up at the edge of the horizontal board of base (301), erect of base (301) and put inside cavity (13) of having seted up of piece, drive mechanism includes two gears (11), two the other end at screw rod (9) and regulation pole (12), two are installed respectively in gear (11) meshing, and two gear (11) all are located the inside of cavity (13).

6. The stroke detection device of the servomotor of the hydroelectric generating set according to claim 5, wherein: limiting mechanism includes limiting plate (7) of L shape, one side at supporting shoe (302) is fixed in limiting plate (7), abdication breach (8) that supply optical cable (5) to pass are seted up to one side of the vertical board of limiting plate (7), screw (17) that supply expansion bolts to fix are seted up to one side of supporting shoe (302).

7. The stroke detection device of the servomotor of the hydroelectric generating set according to claim 3, wherein: telescopic link (16) are the setting of aliging with screw rod (9), and two telescopic link (16) are located the both sides of screw rod (9), the circular slot that supplies telescopic link (16) installation is seted up to the upper surface of base (301), telescopic link (16) are located the inside of circular slot completely when not extending.

8. The stroke detection device of the servomotor of the hydroelectric generating set according to claim 7, wherein: the telescopic rod (16) comprises a sleeve (1601), an inner rod (1602) and a stop block (1603), wherein the stop block (1603) is located inside the sleeve (1601), a through hole for the one end of the inner rod (1602) to penetrate through is formed in one end of the sleeve (1601), and the one end of the inner rod (1602) penetrates through the side wall of the sleeve (1601) and is fixed to one side of the stop block (1603).

9. The utility model provides a hydroelectric set servomotor stroke detecting system, includes detection module, response module and display module, its characterized in that: the sensing module is connected with the detection module through an optical fiber, the sensing module comprises a fiber bragg grating pull rope type displacement sensor (4), the detection module comprises a fiber bragg grating demodulator (6), and the display module comprises a liquid crystal display screen.

Technical Field

The invention belongs to the technical field of water turbine speed regulation, and particularly relates to a stroke detection device and system for a servomotor of a water turbine generator set.

Background

The servomotor is arranged on a cylindrical gate valve between a fixed guide vane and a movable guide vane of the water turbine, when the unit has accidents such as runaway or failure of a water distributor and incapability of closing, the movable water closes the cylindrical valve and stops, when a speed regulating system of the water turbine generator set overhauls, the full-opening and full-closing positions of the guide vanes are set, the opening values of the guide vanes correspond to the displacements of the servomotor one by one, so the setting of the full-opening and full-closing positions of the guide vanes is the setting of a servomotor displacement monitoring system, however, the existing servomotor displacement monitoring system usually adopts a pulse encoder, the system is complex in process and inconvenient to install, the accuracy and precision of a setting result cannot be completely guaranteed, and the lean operation of the unit and equipment can be influenced, so the servomotor stroke detection device and system for the water turbine generator set need to be provided.

Disclosure of Invention

The invention aims to provide a stroke detection device and system for a servomotor of a water turbine generator set.

In order to achieve the purpose, the invention adopts the following technical scheme:

a stroke detection device for a servomotor of a hydroelectric generating set comprises a servomotor body, a bracket with adjustable height, a fiber grating stay cord type displacement sensor and a fiber grating demodulator, the servomotor body comprises a static part, a telescopic part and a moving part, the static part and the moving part are respectively positioned at two ends of the telescopic part, the bracket is arranged on the machine frame in the middle of the maximum displacement position of the moving part and the static part through a bolt, the outer wall of the moving part is fixed with angle steel, the bracket is provided with a height adjusting mechanism, the fiber bragg grating pull rope type displacement sensor is fixed on the bracket through an expansion bolt, and the fiber grating stay cord type displacement sensor is connected with the angle steel through a stay cord, a limiting mechanism for mounting the fiber grating stay cord type displacement sensor is arranged on the support, and the fiber grating stay cord type displacement sensor is connected with the fiber grating demodulator through an optical cable.

Preferably, the fiber grating stay cord type displacement sensor comprises a shell, mounting grooves for mounting expansion bolts are formed in two ends of the shell, guide wheels for guiding the stay cords are mounted at one end of the shell, grooves for mounting the guide wheels are formed in the side wall of the shell, and one mounting groove is located inside each groove.

Preferably, the support comprises a base and a supporting block, the upper surface of the base is rotatably connected with a screw, one end of the screw is in threaded connection with the lower end of the supporting block, the lower end of the supporting block is provided with a threaded blind hole for the screw to be in threaded connection, the supporting block is connected with the base through two telescopic rods, and the fiber grating stay cord type displacement sensor is installed on the supporting block.

Preferably, the height adjusting mechanism comprises an adjusting rod, an adjusting disc is fixed at one end of the adjusting rod, an adjusting handle is fixed at one side of the adjusting disc, the other end of the adjusting rod is rotatably connected with the upper surface of the base, and the adjusting rod is in transmission connection with the screw rod through a transmission mechanism.

Preferably, the base is the setting of T type, a plurality of mounting holes have been seted up at the edge of the horizontal board of base, the cavity has been seted up to the perpendicular piece of putting of base, drive mechanism includes two gears, two the gear is installed respectively at the other end of screw rod and regulation pole, two gear engagement, and two the gear all is located the inside of cavity.

Preferably, the limiting mechanism comprises an L-shaped limiting plate, the limiting plate is fixed to one side of the supporting block, an abdicating notch for the optical cable to pass through is formed in one side of a vertical plate of the limiting plate, and a screw hole for fixing the expansion bolt is formed in one side of the supporting block.

Preferably, the telescopic link is the setting of aliging with the screw rod, and two the telescopic link is located the both sides of screw rod, the circular slot that supplies the telescopic link installation is seted up to the upper surface of base, the telescopic link is located the inside of circular slot completely when not extending.

Preferably, the telescopic rod comprises a sleeve, an inner rod and a stop block, the stop block is positioned inside the sleeve, a through hole for penetrating through one end of the inner rod is formed in one end of the sleeve, and one end of the inner rod penetrates through the side wall of the sleeve to be fixed with one side of the stop block.

The stroke detection system for the servomotor of the hydroelectric generating set comprises a detection module, a sensing module and a display module, wherein the sensing module is in optical fiber connection with the detection module, the sensing module comprises a fiber grating stay rope type displacement sensor, the detection module comprises a fiber grating demodulator, and the display module comprises a liquid crystal display screen.

Compared with the prior art, the stroke detection device and the stroke detection system for the servomotor of the water turbine generator set have the following advantages that:

1. according to the invention, the bracket is arranged at the position close to the servomotor body, the fiber bragg grating pull rope type displacement sensor is arranged on the bracket, the displacement distance of the servomotor can be conveniently and accurately detected through the matching of the fiber bragg grating pull rope type displacement sensor, the servomotor body and the fiber bragg grating demodulator, the bracket is arranged on the rack for mounting the servomotor body, the mounting of the detection device is convenient, and the accuracy of full opening and position setting of the guide vane is improved to a certain extent;

2. according to the invention, the fiber bragg grating pull rope type displacement sensor, the fiber bragg grating demodulator and the display screen form a displacement detection system, the system is simple in structure, and the accuracy of detection data is improved through the matching of the fiber bragg grating pull rope type displacement sensor and the fiber bragg grating demodulator;

3. the height adjusting mechanism is convenient for adjusting the height of the fiber bragg grating pull rope type displacement sensor according to the position of the angle steel, and the limiting mechanism is convenient for positioning the position of the fiber bragg grating pull rope type displacement sensor during installation.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic view of the stent structure of the present invention;

FIG. 3 is a schematic structural diagram of a fiber grating pull-cord type displacement sensor according to the present invention;

FIG. 4 is a schematic structural view of a limiting mechanism of the present invention;

FIG. 5 is a schematic view of a base structure of the present invention;

FIG. 6 is a schematic view of the telescopic rod of the present invention;

in the figure: 1. a servomotor body; 101. a moving member; 102. a telescopic member; 103. a stationary member; 2. angle steel; 3. a support; 301. a base; 302. a support block; 4. a fiber grating pull rope type displacement sensor; 401. a housing; 402. pulling a rope; 403. a guide wheel; 5. an optical cable; 6. a fiber grating demodulator; 7. a limiting plate; 8. a abdication gap; 9. a screw; 10. an adjusting disk; 11. a gear; 12. adjusting a rod; 13. a cavity; 14. mounting grooves; 15. mounting holes; 16. a telescopic rod; 1601. a sleeve; 1602. an inner rod; 1603. a stopper; 17. and a screw hole.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The specific embodiments described herein are merely illustrative of the invention and do not delimit the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The invention provides a stroke detection device of a servomotor of a water turbine generator set, which comprises a servomotor body 1, a bracket 3 capable of adjusting height, a fiber bragg grating pull rope type displacement sensor 4 and a fiber bragg grating demodulator 6, wherein the servomotor body 1 comprises a moving part 101, a telescopic part 102 and a static part 103, the moving part 101 and the static part 103 are respectively positioned at two ends of the telescopic part 102, the bracket 3 is arranged on a machine frame between the static part 103 and the maximum displacement part of the moving part 101 through bolts, an angle steel 2 is fixed on the outer wall of the moving part 101, a height adjusting mechanism is arranged on the bracket 3, the fiber bragg grating pull rope type displacement sensor 4 is fixed on the bracket 3 through an expansion bolt, the fiber bragg grating pull rope type displacement sensor 4 is connected with the angle steel 2 through a pull rope 402, a limiting mechanism for installing the fiber bragg grating pull rope type displacement sensor 4 is arranged on the bracket 3, the fiber bragg grating pull rope type displacement sensor 4 is connected with the fiber bragg grating demodulator 6 through an optical cable 5;

the fiber bragg grating pull rope type displacement sensor 4 comprises a shell 401, mounting grooves 14 for mounting expansion bolts are formed in two ends of the shell 401, a guide wheel 403 for guiding a pull rope 402 is mounted at one end of the shell 401, a groove for mounting the guide wheel 403 is formed in the side wall of the shell 401, one mounting groove 14 is located inside the groove, the pull rope 402 can be pulled out in multiple directions through the guide wheel 403 by means of the arrangement of the guide wheel 403, the mounting under different working conditions can be met, the position of an angle steel 2 for fixing the pull rope 402 is selected at the upper limit of the working range of the fiber bragg grating pull rope type displacement sensor 4, the angle steel is not suitable for being too far away, the risk of damage to the pull rope 402 is increased more and more, the pull rope is prevented from being damaged, and marks can be marked at eye positions or protected by barrier strips;

the support 3 comprises a base 301 and a supporting block 302, the upper surface of the base 301 is rotatably connected with a screw 9, one end of the screw 9 is in threaded connection with the lower end of the supporting block 302, the lower end of the supporting block 302 is provided with a threaded blind hole for the screw 9 to be in threaded connection, the supporting block 302 is connected with the base 301 through two telescopic rods 16, the fiber bragg grating stay cord type displacement sensor 4 is installed on the supporting block 302, and the supporting block 302 can move up and down on the screw 9 in the vertical direction conveniently through the matching of the telescopic rods 16 and the supporting block 302;

the height adjusting mechanism comprises an adjusting rod 12, an adjusting disc 10 is fixed at one end of the adjusting rod 12, an adjusting handle is fixed at one side of the adjusting disc 10, the other end of the adjusting rod 12 is rotatably connected with the upper surface of the base 301, and the adjusting rod 12 is in transmission connection with the screw rod 9 through a transmission mechanism, so that the screw rod 9 is driven to rotate by rotating the adjusting handle;

the base 301 is arranged in a T shape, a plurality of mounting holes 15 are formed in the edge of a transverse plate of the base 301, a cavity 13 is formed in the inner portion of a vertical placing block of the base 301, the transmission mechanism comprises two gears 11, the two gears 11 are respectively mounted at the other ends of the screw rod 9 and the adjusting rod 12, the two gears 11 are meshed, the two gears 11 are both located in the cavity 13, the adjusting rod 12 is driven to rotate by the adjusting handle through rotation, the screw rod 9 is driven to rotate through transmission of the two gears 11, the supporting block 302 is moved on the screw rod 9, the height of the supporting block 302 is convenient to adjust, and the mounting height of the fiber grating pull rope type displacement sensor 4 can be adjusted according to actual mounting requirements;

the limiting mechanism comprises an L-shaped limiting plate 7, the limiting plate 7 is fixed on one side of the supporting block 302, an abdicating notch 8 for the optical cable 5 to pass through is formed in one side of a vertical plate of the limiting plate 7, a screw hole 17 for fixing an expansion bolt is formed in one side of the supporting block 302, and the limiting plate 7 is used for limiting the position of the fiber grating stay cord type displacement sensor 4 during installation, so that the fiber grating stay cord type displacement sensor 4 can be installed quickly;

the telescopic rods 16 are aligned with the screw rods 9, the two telescopic rods 16 are positioned on two sides of the screw rods 9, circular grooves for mounting the telescopic rods 16 are formed in the upper surface of the base 301, the telescopic rods 16 are completely positioned in the circular grooves when not extending, and the two telescopic rods 16 are convenient for enabling the supporting block 302 to move upwards or downwards in the vertical direction;

the telescopic rod 16 comprises a sleeve 1601, an inner rod 1602 and a stopper 1603, the stopper 1603 is located inside the sleeve 1601, a through hole for one end of the inner rod 1602 to penetrate through is formed in one end of the sleeve 1601, and one end of the inner rod 1602 penetrates through the side wall of the sleeve 1601 to be fixed with one side of the stopper 1603;

when in use, the bracket body 3 is firstly installed on a frame, then the base 301 is installed on the frame between the moving part 103 and the maximum displacement position of the static part 101 through the installation hole 15 by using bolts, the fiber grating stay cord type displacement sensor 4 is installed on one side of the supporting block 302 through the limiting plate 7, the fiber grating stay cord type displacement sensor 4 is fixed with the supporting block 302 through the matching of the expansion bolt and the screw hole 17, then one end of the stay cord 402 of the fiber grating stay cord type displacement sensor 4 is fixed with the angle iron 2, when the fiber bragg grating pull rope type displacement sensor 4 detects the displacement distance, one end of the pull rope 402 is driven to be elongated by the moving part 103, through the cooperation of the fiber bragg grating pull rope type displacement sensor 4 and the fiber bragg grating demodulator 6, the displacement distance of the moving part 103 can be conveniently and accurately measured, and the accuracy of full opening and position setting of the guide vane is improved to a certain extent.

The utility model provides a hydroelectric set servomotor stroke detecting system, includes detection module, response module and display module, and response module and detection module optical fiber connection, response module include fiber grating stay cord formula displacement sensor 4, and detection module includes fiber grating demodulator 6, and display module includes liquid crystal display.

The fiber grating demodulator 6 is the core of the whole set of system, the wavelength demodulation principle of the demodulator is that a broadband spectrum light source is adopted to output light, and the light reaches the fiber grating sensor through an optical splitter; the reflected light is sent to the wavelength tunable filter through the branching unit, and can be received by the detector through the filter only when the wavelength of the reflected light is the same as that of the tunable filter, and the wavelength change of the sensing grating is calculated according to the corresponding relation of the wavelength of the tunable filter and the power of the detector;

the fiber grating stay cord type displacement sensor 4 is suitable for measuring the displacement of mechanical components, can also measure the change of expansion joints and the like, the product is connected with two measured components inside the sensor through a steel wire rope, when relative displacement occurs between the components, the steel wire rope is pulled out or retracted, and the displacement/stroke amount is converted into the stress action on the internal fiber grating, so that the wavelength output value of the fiber grating is changed, and the test purpose is achieved. A built-in temperature sensor for measuring temperature and compensating the displacement;

the fiber grating is a structure with refractive index periodically distributed along the axial direction of a fiber core by utilizing the natural photosensitive characteristic of a fiber material, the special structure periodically distributed can change the transmission path of light with a certain specific wavelength, so that the propagation direction of the light is changed, namely a filter or a reflector with a certain bandwidth is formed in the fiber, and the influence of the outside on the reflection wavelength of the fiber grating is mainly realized by the action of temperature (thermal expansion effect, thermo-optic effect and elasto-optic effect) and strain (elastic deformation, elasto-optic effect and waveguide effect); physical information can be restored by monitoring the corresponding relation between the reflection wavelength change of the fiber bragg grating and the physical quantity to be measured in real time, which is the theoretical basis of fiber bragg grating sensing; the fiber grating can adopt different forms and packaging forms according to different application occasions;

form displacement detection system through fiber grating stay cord formula displacement sensor 4, fiber grating demodulator 6 and display screen, this system simple structure, and through fiber grating stay cord formula displacement sensor 4, the cooperation of fiber grating demodulator 6, improved the precision of detecting data.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments or portions thereof without departing from the spirit and scope of the invention.