CN111537206A - Simulated overspeed protection test device and method - Google Patents
Simulated overspeed protection test device and method Download PDFInfo
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- CN111537206A CN111537206A CN202010335551.9A CN202010335551A CN111537206A CN 111537206 A CN111537206 A CN 111537206A CN 202010335551 A CN202010335551 A CN 202010335551A CN 111537206 A CN111537206 A CN 111537206A
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- flyweight
- overspeed protection
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- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
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Abstract
A simulated overspeed protection test device and a simulated overspeed protection test method relate to a test device and a test method, in particular to a simulated overspeed protection test device and a simulated overspeed protection test method. The invention aims to solve the problems of poor reliability and more workload in the later period of the conventional overspeed protection test method. The device comprises a rotor and a flyweight assembly, wherein the rotor is provided with a through hole penetrating through two sides of the rotor, and the flyweight assembly is arranged in the through hole. The invention belongs to the field of machining.
Description
Technical Field
The invention relates to a test device and a test method, in particular to a simulated overspeed protection test device and a simulated overspeed protection test method, and belongs to the field of machining.
Background
The steam turbine set has an overspeed protection function, when the rotating speed of the set exceeds rated power, tripping, steam cut-off and shutdown are realized through a designated mechanism, and the set is protected from being damaged. The mechanism for realizing overspeed protection of the steam turbines with different models is also different. Before leaving the factory, the reliability of the overspeed protection mechanism is tested through tests. The size of the adjusting washer is adjusted, the compression amount of the spring is changed, and the pressure of the spring is changed, so that the flyweight can bounce and strike the safety device at a certain rotating speed, and tripping and stopping are realized.
Disclosure of Invention
The invention provides a simulated overspeed protection test device and method for solving the problems of poor reliability and more workload in the later period of the conventional overspeed protection test method.
The technical scheme adopted by the invention for solving the problems is as follows: the testing device comprises a rotor and a flyweight assembly, wherein the rotor is provided with a through hole penetrating through two sides of the rotor, and the flyweight assembly is arranged in the through hole.
Furthermore, the flyweight component comprises a flyweight, a spring, a first plug and a second plug, the first plug is embedded in the left end of the through hole, the second plug is embedded in the right end of the through hole, the flyweight is horizontally arranged in the through hole, the left end of the flyweight is inserted into the first plug, the left side surface of a clamping platform on the flyweight is in contact with the first plug, the right end of the flyweight is inserted into the second plug, the spring is sleeved on the flyweight, the left end of the spring is in contact with the right side surface of the clamping platform on the flyweight, and the right end of the spring is in contact with the second plug.
Furthermore, the testing device also comprises an adjusting washer and a fixed washer, wherein the adjusting washer and the fixed washer are sequentially arranged in the right end of the through hole from left to right, and the adjusting washer and the fixed washer are both positioned on the right side of the second plug.
The test method comprises the following specific steps:
step one, adjusting the thickness of an adjusting washer to enable the thickness of the adjusting washer to be matched with the rotating speed of a flyweight;
step two, acquiring the mass center of the flyweight;
step three, acquiring a centrifugal force F borne by the flyweight;
and step four, calculating the compression amount of the spring.
Further, in the second step, the mass center of the flyweight is directly obtained by UG three-dimensional drawing software, the distance r between the mass center of the flyweight and the rotation axis of the rotor is obtained by calculation, and r is N- (phi A3/2-Q + P), wherein phi A3 represents the diameter of the rotor, Q represents the thickness of the first plug at the left end of the flyweight, P represents the tail size of the flyweight, and N represents the mass center of the flyweight and the tail size of the flyweight.
Further, the centrifugal force of the flyweight in the third step is calculated as F ═ mv2/r, where m represents the mass of the flyweight, v represents the designated rotation speed of the rotor when tripping is required, and r represents the centrifugal motion radius of the flyweight.
Further, the spring force of the spring is given by the formula F ═ -kx, where F denotes the spring force of the spring, k denotes the spring constant of the spring, and x denotes the amount of compression of the spring.
The invention has the beneficial effects that: the invention can directly draw the reliability conclusion of the overspeed test in a simple and visual way. The thickness size of the adjusting washer can be obtained through calculation, the later adjusting range is small, and the working efficiency is improved; the invention has the advantages of speed and efficiency improvement, simplicity and convenience; the invention is specially used for simulating the overspeed protection test, and the test effect is verified in advance, thus being simple and direct; according to the invention, under the condition of no oil and no steam, the reliability of the overspeed mechanism is verified through manually turning the gear transmission mechanism, the thickness of the adjusting washer is calculated through measuring the size of a part, the adjusting range is controlled within a minimum size, the working efficiency is improved, the test period is shortened, and the disassembling times are reduced.
Drawings
FIG. 1 is a schematic view of the structure of the test apparatus of the present invention.
Detailed Description
The first embodiment is as follows: the embodiment is described with reference to fig. 1, and the simulated overspeed protection test device of the embodiment comprises a rotor 1 and flyweight assemblies, wherein the rotor 1 is provided with through holes 1-1 penetrating through two sides of the rotor 1, and the flyweight assemblies are installed in the through holes 1-1.
The second embodiment is as follows: the embodiment is described with reference to fig. 1, and the flyweight assembly of the simulated overspeed protection test apparatus of the embodiment includes a flyweight 2, a spring 3, a first plug 4 and a second plug 5, wherein the first plug 4 is embedded in the left end of the through hole 1-1, the second plug 5 is embedded in the right end of the through hole 1-1, the flyweight 2 is horizontally arranged in the through hole 1-1, the left end of the flyweight 2 is inserted into the first plug 4, the left side surface of the clamping platform 2-1 on the flyweight 2 is in contact with the first plug 4, the right end of the flyweight 2 is inserted into the second plug 5, the spring 3 is sleeved on the flyweight 2, and the spring 3 is provided. Other components and connections are the same as those in the first embodiment.
The third concrete implementation mode: the embodiment is described with reference to fig. 1, and the overspeed protection simulation test device according to the embodiment further includes an adjusting washer 6 and a fixing washer 7, the adjusting washer 6 and the fixing washer 7 are sequentially disposed in the right end of the through hole 1-1 from left to right, and both the adjusting washer 6 and the fixing washer 7 are located on the right side of the second plug 5.
The fourth concrete implementation mode: the embodiment is described with reference to fig. 1, and the specific steps of the simulated overspeed protection test method according to the embodiment are as follows:
step one, adjusting the thickness of an adjusting washer 6 to enable the thickness of the adjusting washer 6 to be matched with the rotating speed of the flyweight 2;
step two, acquiring the mass center of the flyweight 2;
step three, acquiring a centrifugal force F borne by the flyweight 2;
and step four, calculating the compression amount of the spring 3.
The fifth concrete implementation mode: the embodiment is described with reference to fig. 1, in the second step of the simulated overspeed protection test method in the embodiment, the centroid of the flyweight 2 is directly obtained by UG three-dimensional drawing software, the distance r between the centroid of the flyweight 2 and the rotation axis of the rotor 1 is obtained by calculation, and r is N- (Φ A3/2-Q + P), where Φ A3 represents the diameter of the rotor 1, Q represents the thickness of the first plug 4 at the left end of the flyweight 2, P represents the tail size of the flyweight 2, and N represents the centroid of the flyweight 2 and the tail size of the flyweight.
In the embodiment, Φ a3 and Q, P can be directly obtained by using a measuring tool such as a caliper, and N can be directly obtained by UG mapping.
The sixth specific implementation mode: the present embodiment is described with reference to fig. 1, and the centrifugal force calculation formula of the flyweight 2 in the third step of the simulated overspeed protection test method according to the present embodiment is F ═ mv2/r, where m denotes the mass of the flyweight 2, v denotes the specified rotation speed of the rotor 1 when tripping is requested, and r denotes the centrifugal motion radius of the flyweight 2.
In this embodiment m is measured by a balance, which deduces: f-mv 2/r-mv 2/[ N- (Φ A3/2-Q + P) ].
The seventh embodiment: the present embodiment is described with reference to fig. 1, and the spring force of the spring 3 in the simulated overspeed protection test method according to the present embodiment is obtained by the formula F — kx, where F denotes the spring force of the spring 3, k denotes the spring constant of the spring 3, and x denotes the compression amount of the spring 3.
In the embodiment, the k value can be directly measured by a professional spring rigidity detection instrument; it can also be calculated from the formula K ═ G × d4)/(8 × Dm3 × Nc; wherein G represents the modulus of stiffness of the wire; d represents the wire diameter; do denotes the outer diameter; di represents an inner diameter; dm represents the pitch diameter; n represents the total number of turns; nc represents the number of effective turns N-2.
-kx ═ mv2/[ N- (Φ A3/2-Q + P) ], from which the amount of compression x that the spring 3 needs to reach can be calculated, and then the height value W, W-L in the free state of the spring 3 is measured, from which the actual amount of compression of the spring 3 at that time can be calculated.
X- (W-L), which is the theoretical thickness value of the adjustment washer.
Principle of operation
The gear structure is rotated by a manual disc, the rotor 1 is driven to rotate, the flying hammer 2 rotates along with the rotor, the front end of the flying hammer 2 dials a trigger which is safely assembled, and if the trigger acts to trigger tripping, the mechanism functions normally; if the trigger does not act, the front end of the flyweight 2 can not contact the trigger and the like, the thicknesses of the adjusting washer 6 and the fixing washer 7 can be reduced, the extension amount of the flyweight 2 is increased, the test steps are repeated, and an effective R value is determined; the thickness of the gasket 6 can be adjusted by repairing the front end face of the flyweight 2 or thinning the flyweight in the later period to fix the R value
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (7)
1. The utility model provides a simulation overspeed protection test device which characterized in that: the simulated overspeed protection test device comprises a rotor (1) and a flyweight assembly, wherein a through hole (1-1) penetrating through two sides of the rotor (1) is formed in the rotor (1), and the flyweight assembly is installed in the through hole (1-1).
2. A simulated overspeed protection test apparatus as set forth in claim 1, wherein: the flyweight component comprises a flyweight (2), a spring (3), a first plug (4) and a second plug (5), the first plug (4) is embedded in the left end of the through hole (1-1), the second plug (5) is embedded in the right end of the through hole (1-1), the flyweight (2) is horizontally arranged in the through hole (1-1), the left end of the flyweight (2) is inserted into the first plug (4), the left side surface of a clamping platform (2-1) on the flyweight (2) is in contact with the first plug (4), the right end of the flyweight (2) is inserted into the second plug (5), the spring (3) is sleeved on the flyweight (2), the left end of the spring (3) is in contact with the right side surface of the clamping platform (2-1) on the flyweight (2), and the right end of the spring (3) is in contact with the second plug (5).
3. A simulated overspeed protection test apparatus as set forth in claim 1 or 2, wherein: the simulated overspeed protection test device further comprises an adjusting washer (6) and a fixing washer (7), wherein the adjusting washer (6) and the fixing washer (7) are sequentially arranged in the right end of the through hole (1-1) from left to right, and the adjusting washer (6) and the fixing washer (7) are both positioned on the right side of the second plug (5).
4. A simulated overspeed protection test method is characterized in that: the method for simulating the overspeed protection test comprises the following specific steps:
step one, adjusting the thickness of an adjusting washer (6) to enable the thickness of the adjusting washer (6) to be matched with the rotating speed of the flyweight (2);
secondly, acquiring the mass center of the flyweight (2);
step three, acquiring a centrifugal force F borne by the flyweight (2);
and step four, calculating the compression amount of the spring (3).
5. A simulated overspeed protection test method as set forth in claim 4, wherein: and in the second step, the mass center of the flyweight (2) is directly obtained by UG three-dimensional drawing software, the distance r between the mass center of the flyweight (2) and the rotation axis of the rotor (1) is obtained by calculation, and r is N- (phi A3/2-Q + P), wherein phi A3 represents the diameter of the rotor (1), Q represents the thickness of the first plug (4) at the left end of the flyweight (2), P represents the tail size of the flyweight (2), and N represents the size of the mass center of the flyweight (2) from the tail end of the flyweight.
6. A simulated overspeed protection test method as set forth in claim 4, wherein: the centrifugal force calculation formula of the flyweight (2) in the third step is F ═ mv2/r, wherein m represents the mass of the flyweight (2), v represents the designated rotating speed of the rotor (1) when tripping is required, and r represents the centrifugal motion radius of the flyweight (2).
7. A simulated overspeed protection test method as set forth in claim 4, wherein: the elastic force of the spring (3) is obtained by the formula F ═ -kx, wherein F represents the elastic force of the spring (3), k represents the elastic coefficient of the spring (3), and x represents the compression amount of the spring (3).
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| CN202010335551.9A CN111537206B (en) | 2020-04-25 | 2020-04-25 | Simulated overspeed protection test device and method |
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| CN202010335551.9A CN111537206B (en) | 2020-04-25 | 2020-04-25 | Simulated overspeed protection test device and method |
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| CN111537206A true CN111537206A (en) | 2020-08-14 |
| CN111537206B CN111537206B (en) | 2022-01-28 |
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Citations (6)
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| CN87209385U (en) * | 1987-12-01 | 1988-12-07 | 国家机械工业委员会无锡油泵油嘴研究所 | Negative corrected device for centrifugal governor of diesel engine |
| RU2013571C1 (en) * | 1991-02-25 | 1994-05-30 | Комсомольский-на-Амуре политехнический институт | Safety arrangement |
| CN105351470A (en) * | 2015-11-30 | 2016-02-24 | 重庆红江机械有限责任公司 | Gear transmission device having overspeed circumferential displacement output function |
| CN105928709A (en) * | 2016-04-22 | 2016-09-07 | 大唐东北电力试验研究所有限公司 | Steam turbine set emergency governor test device |
| CN108131173A (en) * | 2018-02-06 | 2018-06-08 | 中国船舶重工集团公司第七0四研究所 | It is peculiar to vessel can on-line tuning formula hypervelocity protective device |
| CN209639949U (en) * | 2019-04-04 | 2019-11-15 | 山东赫德能源科技有限公司 | A kind of emergency governor testing device |
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2020
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN87209385U (en) * | 1987-12-01 | 1988-12-07 | 国家机械工业委员会无锡油泵油嘴研究所 | Negative corrected device for centrifugal governor of diesel engine |
| RU2013571C1 (en) * | 1991-02-25 | 1994-05-30 | Комсомольский-на-Амуре политехнический институт | Safety arrangement |
| CN105351470A (en) * | 2015-11-30 | 2016-02-24 | 重庆红江机械有限责任公司 | Gear transmission device having overspeed circumferential displacement output function |
| CN105928709A (en) * | 2016-04-22 | 2016-09-07 | 大唐东北电力试验研究所有限公司 | Steam turbine set emergency governor test device |
| CN108131173A (en) * | 2018-02-06 | 2018-06-08 | 中国船舶重工集团公司第七0四研究所 | It is peculiar to vessel can on-line tuning formula hypervelocity protective device |
| CN209639949U (en) * | 2019-04-04 | 2019-11-15 | 山东赫德能源科技有限公司 | A kind of emergency governor testing device |
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Effective date of registration: 20221221 Address after: 150000 building 3, high tech production base, Nangang District, Harbin City, Heilongjiang Province Patentee after: HARBIN TURBINE Co.,Ltd. Patentee after: HADIAN POWER EQUIPMENT NATIONAL ENGINEERING RESEARCH CENTER CO.,LTD. Address before: 150046 No. three power road 345, Xiangfang District, Heilongjiang, Harbin Patentee before: HARBIN TURBINE Co.,Ltd. |
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