CN203163976U - Hydropower station machinery hydraulic overspeed protection device simulation test stand - Google Patents
Hydropower station machinery hydraulic overspeed protection device simulation test stand Download PDFInfo
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- CN203163976U CN203163976U CN 201320135191 CN201320135191U CN203163976U CN 203163976 U CN203163976 U CN 203163976U CN 201320135191 CN201320135191 CN 201320135191 CN 201320135191 U CN201320135191 U CN 201320135191U CN 203163976 U CN203163976 U CN 203163976U
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- protection device
- simulation test
- test stand
- overspeed protection
- device simulation
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Abstract
The utility model discloses a hydropower station machinery hydraulic overspeed protection device simulation test stand. The hydropower station machinery hydraulic overspeed protection device simulation test stand comprises a platform support, a variable frequency motor and a revolution system, wherein the variable frequency motor is connected with the revolution system through a shaft coupling and then through a center shaft, the center shaft is equipped with a velocity measurement tooth disc, one side of the velocity measurement tooth disc is provided with a velocity measurement sensor, the velocity measurement sensor is connected with a PLC controller of a control cabinet through signal wires, the platform support is equipped with a fixing support, the revolution system is equipped with a clamp, and the PLC controller of the control cabinet is further connected with the variable frequency motor and a micro switch arranged on a hydraulic reversing valve set respectively through signal wires. The hydropower station machinery hydraulic overspeed protection device simulation test stand is advantaged in that: operation is convenient to carry out by dismounting a protection device and then mounting the protection device on the simulation test stand, a number of tests can be improved randomly, destroy and fatigue damage to a set do not occur, the hydropower station machinery hydraulic overspeed protection device simulation test stand further has properties of high reliability, convenient adjustment, high efficiency, energy-saving performance and environmental protection.
Description
Technical field
The utility model relates to a kind of power station mechanical-hydraulic overspeed protection device simulation test stand.
Background technology
Along with the requirement to the power station security of operation improves, the power station all is provided with pure mechanical-hydraulic overspeed protection device basically at present.This device be overrun in the electric one-level of unit, secondary last together for the protection of emergency stop after overrunning all and losing efficacy; it can worked under the situation of power supply; accident appears at unit, when rotating speed reaches the alarming value of setting the direct control hydraulic circuit come direct closure plane group servomotor and (or) unit water inlet main valve.
The machinery overdrive mainly is made up of fly to escape detector and hydraulicdirectional control valve group two parts:
Fly the detector that escapesBe fixed on the macro-axis and rotate with macro-axis,
The hydraulicdirectional control valve groupThen be fixed on around the foundation ditch.The detector front end that flies to escape be one by spring compression
Centrifugal,The front end of hydraulicdirectional control valve group is one
The touching device(being cam, outstanding arch section).During installation, guarantee centrifugal with the touching device over against the time
Space D 1(the installing space difference of different overdrives often is 1.5mm, 3mm) to meet product use regulation.Its ultimate principle is to utilize the principle of centrifugal force to make detector stretch out, clash into the touching device of hydraulicdirectional control valve group, and then triggers the emergency stop hydraulic circuit.
Fly to escape detector in along with the macro-axis rotating process, be subjected to square being directly proportional of outside centrifugal force and generating unit speed in the horizontal direction: F=m r ω, the detector acting in opposition that can be subjected to a preloading spring and the position-limit mechanism N that makes a concerted effort simultaneously.The course of action of machinery overdrive is as follows:
Step1: as generating unit speed≤rated speed n
1The time, spring is in stable precompression length;
Step2: when generating unit speed raises, when making centrifugal force F＞N, centrifugal of the detector that flies to escape then begins to stretch out laterally (detector disengaging this moment position-limit mechanism, the acting force of N=spring), spring further compresses the increase of equilibrium centrifugation power, simultaneously, centrifugal radius of turn r has also increased Δ r.
Step3:
When continue raising, unit transient speed n reaches the highest level setting valve n that overruns 2 The time (generally being that the third level is overrun), centrifugal distance, delta r that stretches out of the detector 〉=installing space D1 that flies to escape,Centrifugal is fixed on the touching device of hydraulicdirectional control valve group on one side with bump, and the valve group is switched the emergency cutoff hydraulic circuit immediately, finally reaches the purpose of shutdown.
Can the machinery overdrive protect genset reliably when accident takes place,
Key be to fly to escape detector can be in accuracy rating action message and reversal valve group whether can commutate i.e.: n=n flexibly 2 Be relevant equation with Δ r=D1, in the accuracy rating of device, must set up simultaneously.
More than told about result and the ultimate principle of mechanical-hydraulic overspeed protection device, below our the on-the-spot prototype of talking this device overrun test and static check.
Last pipe protection that major accident prevents from being expanded into afterwards catastrophic failure occurring because the mechanical-hydraulic overspeed protection device is whole power station, also is a most important pipe protection, so country very payes attention to this! All need to do the test of overrunning after unit puts into operation for the first time, the unit scheduled overhaul finishes.The spring of detector of flying to escape is in the state that compression and complicated machinery vibrate for a long time, its rigidity value can be along with the passage of time of operation change (this variation generally is that rigidity value diminishes), so even if test is accurately for the first time, each power station also may change after the operation certain hour, so can be done once inspection surely in general 2 ~ 3 years according to the characteristics of self.
Test has the disadvantage of himself but prototype is overrun:
(1) this test belongs to destructive test fully, and just as fire-fighting drill on the spot, the accident rotating speed that needs generating unit speed n to surpass highest level (generally all is n
2〉=150% n
1) time aptitude test go out mechanical overdrive whether can precision maneuver, often whole factory building is finished this test at every turn and all can be brought serious mechanical wear and damage to the whole generating unit all at high vibration, produces volume of smoke, reduce unit serviceable life, power consumption and not environmental protection.
(2) also need do a health check-up comprehensively to whole unit after each prototype is overrun and tested, and readjust the work of multinomial complexity such as bearing guide shoe gap.This destructive test just is reluctant to continue very much in some power station again in first time unsuccessful test, but still or select revision test, or it is reliable and put into operation to select to trust this equipment.
In view of above disadvantage, some power plant has taked the static check method:
The centrifugal force N2 of correspondence during with the mode simulated action rotating speed of tautness meter or counterweight, this moment is with centrifugal length of stretching out of stadia surveying
Δ rWhether equal
D1, if not, then adjust the setting nut of spring end, change the precompression length of spring, make
Δ r=D1
The static check methodCan avoid the destruction to the unit generation, also can save a lot of numerous and diverse check and adjustment work to genset, yet, owing to envelope test is finished by theoretical calculation mode, its
Composition error is very big, mainly comes from the accumulation of the following aspects error, reliability and precision that can not assurance device:
(1) says from the front " step2 " as can be known, the power of stretching out rear spring when probe is becoming, and centrifugal mass centre is becoming, and the mass centre of spring is also becoming, spring itself is also bearing action of centrifugal force and is compressing, so its N reality that acts on centrifugal also is an approximate value; In addition, for different springs, different unit major axial diameter, these two kinds of changes are to result's influence degree difference.Generally speaking, these influences are smaller, so often calculating formula has been ignored as an error.
(2) even if detector action is accurate, but the valve group may not action message.The touching device of reversal valve group is the ratchet device of pure machinery, and its intrinsic touching stroke and repeated deviation is arranged.When centrifugal cambered surface from tangential bump cam, be not action at a touch, otherwise ratchet device is also too sensitive and cause malfunction.So which kind of degree detector need collide with cam could allow the touching device response be incalculable, and bigger to result's influence.
(3) through operation for a long time, the mechanical wear of detector and reversal valve group, lubricated, dirigibility also can exert an influence to the precision of device, this influence is much smaller relatively, but but took place because the stuck situation of akinesia, cause the unit driving, guide shoe burns, and unit is reprocessed, reset.
In sum, the destructiveness of dynamic test is strong, and the error of static check is big, but having to again test is a power station contradiction for a long time.
The utility model content
The utility model has overcome shortcoming of the prior art, and a kind of power station mechanical-hydraulic overspeed protection device simulation test stand is provided.
The technical solution of the utility model is: a kind of power station mechanical-hydraulic overspeed protection device simulation test stand, comprise platform support and be arranged on the platform support bottom variable-frequency motor, be arranged on the rotary system on platform support top, described variable-frequency motor links to each other with rotary system through central shaft by shaft coupling; At central shaft speed measuring fluted disc is installed, is provided with tachogenerator in a side of speed measuring fluted disc, described tachogenerator is connected with the PLC controller of switch board by signal wire; At platform support fixed support is installed, at rotary system anchor clamps is installed; The PLC controller of described switch board also is connected with microswitch on being arranged on the hydraulicdirectional control valve group with variable-frequency motor respectively by signal wire.
Compared with prior art, the utility model has the advantages that:
(1) can not produce destruction and fatigue damage to unit;
(2) easy to operate, only need be pulled down overspeed protection device, are installed on the simulation test stand to get final product;
(3) success of the test rate also is an important indicator of reliability, real machine test can not thresh several times, like that unit is destroyed serious, do test if adopt simulation test stand according to the radius of turn of prototype, can arbitrarily increase test number (TN), the result who draws like this is only credible;
(4) it is higher, easy to adjust to compare the reliability of static check precision, and the efficient height is energy-conservation, environmental protection.Prior, the direct real machine test in power station is resetted and is needed a week consuming time from preparing crew check after the off-test, can finish in short several hrs and test (verification) at simulation test stand of the present utility model.
Description of drawings
The utility model will illustrate by example and with reference to the mode of accompanying drawing, wherein:
Fig. 1 is structural representation of the present utility model.
Embodiment
A kind of power station mechanical-hydraulic overspeed protection device simulation test stand; as shown in Figure 1; mainly comprise: platform support 1, rotary system 2, central shaft 3, speed measuring fluted disc 4, thrust bearing 5, shaft coupling 7, variable-frequency motor 8, systems stabilisation 9, fixed support 10, anchor clamps 11, switch board etc., wherein:
Platform support 1 is connected with the earth basic rigidity by systems stabilisation 9, and all devices is installed on this platform support.The variable-frequency motor 8 of foot links to each other with the rotary system 2 that is arranged on platform support 1 top through central shaft 3 by shaft coupling 7, transmits kinetic energy and damping force.Thrust bearing 5 is installed on the central shaft 3, beats with the axle center of restriction central shaft 3 in the high speed rotary course, anchorage force upwards is provided for simultaneously rotary system 2.Speed measuring fluted disc 4 has been installed on the central shaft 3, has been provided with a current vortex sensor in a side of speed measuring fluted disc 4, described current vortex sensor is connected with the PLC controller of switch board by signal wire, is used for measuring in real time the rotating speed of rotary system 2.Fixed support 10 is installed on the platform support 1, is used for installing the reversal valve group of overdrive, and 11 of anchor clamps are installed on the rotary system 2, is used for fixedly flying the detector that escapes, and detector and rotary system are rotated synchronously.
Switch board is arranged in the position outside the simulation test stand handling safety distance, is used for controlling the whole simulation process of the test.When doing l-G simulation test, directly control variable-frequency motor 8 by switch board and drive rotary system 2; Each tooth of speed measuring fluted disc 4 just sends a pulse signal to switch board during through the tachogenerator (current vortex sensor) on testing table, and switch board just can record the rotating speed of revolving dial in real time like this; Served as quick-mounting and put when moving, the microswitch on the hydraulicdirectional control valve group also can send an electric signal and send switch board to, and switch board records the tachometer value n on this time point at once
T0, immediately, switch board is shut down up to simulation test stand to variable-frequency motor 8 output braking moments.Operating personnel can finish entire test on switch board, the various information in the process of the test will be presented on the man-machine interface, and test data sheet simultaneously also will be preserved automatically.In the process of the test, test revolving dial and switch board have been made videograph respectively.
Variable-frequency motor 8 is the power of whole simulation test platform, and the rated speed of 50 ~ 1000rpm can be provided, simultaneously can be to the motor plugging.Frequency converter is controlled by the PLC controller that is arranged in the switch board, can control the rotating speed of rotary system 2 according to setting curve.
Although frequency converter can feed back rotating speed, for the precision that guarantees to measure, we are provided with independently velocity-measuring system, and a speed measuring fluted disc 4 that rotates synchronously has been installed in rotary system 2 lower ends, improve precision and the reliability that tests the speed by the mode of counting tooth.
Actuating signal is gathered and buzzing is reported to the police is used for accurately and timely determining protective device action rotating speed constantly.When the hydraulicdirectional control valve group was moved, signal pickup assembly in time recorded the rotating speed of current time.
Switch board is the nervous centralis of whole simulation test platform, is used for the running of control whole simulation test platform, and the various signals of gathering are recorded, analyze.Adopt human-computer conversational mode.
Claims (3)
1. power station mechanical-hydraulic overspeed protection device simulation test stand, it is characterized in that: comprise platform support and be arranged on the platform support bottom variable-frequency motor, be arranged on the rotary system on platform support top, described variable-frequency motor links to each other with rotary system through central shaft by shaft coupling; At central shaft speed measuring fluted disc is installed, is provided with tachogenerator in a side of speed measuring fluted disc, described tachogenerator is connected with the PLC controller of switch board by signal wire; At platform support fixed support is installed, at rotary system anchor clamps is installed; The PLC controller of described switch board also is connected with microswitch on being arranged on the hydraulicdirectional control valve group with variable-frequency motor respectively by signal wire.
2. power station according to claim 1 mechanical-hydraulic overspeed protection device simulation test stand is characterized in that: at central shaft thrust bearing is installed.
3. power station according to claim 1 mechanical-hydraulic overspeed protection device simulation test stand, it is characterized in that: described tachogenerator is current vortex sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320135191 CN203163976U (en) | 2013-03-22 | 2013-03-22 | Hydropower station machinery hydraulic overspeed protection device simulation test stand |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320135191 CN203163976U (en) | 2013-03-22 | 2013-03-22 | Hydropower station machinery hydraulic overspeed protection device simulation test stand |
Publications (1)
| Publication Number | Publication Date |
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| CN203163976U true CN203163976U (en) | 2013-08-28 |
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ID=49025153
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320135191 Expired - Lifetime CN203163976U (en) | 2013-03-22 | 2013-03-22 | Hydropower station machinery hydraulic overspeed protection device simulation test stand |
Country Status (1)
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103196664A (en) * | 2013-03-22 | 2013-07-10 | 四川中鼎自动控制有限公司 | Hydraulic power plant mechanical hydraulic pressure over-speed protection device simulation test platform and test method |
| CN112268705A (en) * | 2020-10-23 | 2021-01-26 | 湛江海滨船厂 | Dynamic inspection equipment for mechanical overspeed protection device of engine |
-
2013
- 2013-03-22 CN CN 201320135191 patent/CN203163976U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103196664A (en) * | 2013-03-22 | 2013-07-10 | 四川中鼎自动控制有限公司 | Hydraulic power plant mechanical hydraulic pressure over-speed protection device simulation test platform and test method |
| CN103196664B (en) * | 2013-03-22 | 2015-06-10 | 四川中鼎自动控制有限公司 | Hydraulic power plant mechanical hydraulic pressure over-speed protection device simulation test platform and test method |
| CN112268705A (en) * | 2020-10-23 | 2021-01-26 | 湛江海滨船厂 | Dynamic inspection equipment for mechanical overspeed protection device of engine |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130828 |