CN109374305B - MTU956 diesel engine main valve performance test system and test method thereof - Google Patents
MTU956 diesel engine main valve performance test system and test method thereof Download PDFInfo
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- CN109374305B CN109374305B CN201811390680.7A CN201811390680A CN109374305B CN 109374305 B CN109374305 B CN 109374305B CN 201811390680 A CN201811390680 A CN 201811390680A CN 109374305 B CN109374305 B CN 109374305B
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- 238000011056 performance test Methods 0.000 title claims description 11
- 238000010998 test method Methods 0.000 title claims description 5
- 238000012360 testing method Methods 0.000 claims abstract description 42
- 238000007789 sealing Methods 0.000 claims description 11
- 230000001105 regulatory effect Effects 0.000 claims description 5
- 238000003825 pressing Methods 0.000 claims description 4
- 238000012795 verification Methods 0.000 claims description 4
- 238000004891 communication Methods 0.000 claims description 3
- 238000001514 detection method Methods 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 3
- 230000007812 deficiency Effects 0.000 claims description 2
- 230000005540 biological transmission Effects 0.000 claims 2
- 238000012423 maintenance Methods 0.000 abstract description 9
- 238000004519 manufacturing process Methods 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
- G01M15/04—Testing internal-combustion engines
- G01M15/05—Testing internal-combustion engines by combined monitoring of two or more different engine parameters
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Examining Or Testing Airtightness (AREA)
- Testing Of Devices, Machine Parts, Or Other Structures Thereof (AREA)
Abstract
The system comprises a tightness test system and an opening time test system, wherein the tightness test system comprises an air source quick connector for providing compressed air for the whole tightness test system, a two-position three-way electromagnetic valve for dividing the compressed air into two paths, a first pressure pipeline and a second pressure pipeline which are respectively connected with a pilot air hole Z and a flange P of a main valve, and also comprises a pressure gauge M3 communicated with a blind plate of the main valve, wherein the first pressure pipeline is sequentially provided with a pressure reducing valve and a pressure gauge M1 from the two-position three-way electromagnetic valve to the main valve, and the second pressure pipeline is provided with a pressure gauge M2; the opening time test system comprises a 24V direct current power supply for supplying power to a position relation sensor S of the two-position three-way electromagnetic valve and the main valve at the same time, and a oscillograph connected with the two-position three-way electromagnetic valve and the main valve at the same time. The invention has high test precision, does not need to return the main valve to foreign factories, reduces the production cost and saves the maintenance time.
Description
Technical Field
The invention relates to the field of performance test of a main valve of a diesel engine, in particular to a system and a method for testing the performance of the main valve of an MTU956 diesel engine.
Background
The main starting valve of the MTU956 diesel engine of the nuclear power plant adopts a piston type pneumatic pilot valve, the valve structure is compact and complex, the valve is internally composed of a piston, a spring, various sealing elements and a valve opening position sensor, and the main valve sealing element is required to be replaced periodically by a maintenance department of the power plant due to the limited service life of the rubber element. The emergency diesel engine is required to be started in 10S after the bus power-losing signal appears in the nuclear power plant, so that the performance requirement on the main starting valve is very high, if the main valve is driven or acts slowly due to improper maintenance process, the starting success rate and the starting time of the diesel engine are influenced, the performance of the main valve after maintenance is ensured to meet the use requirement, the performance of the main valve is required to be tested, including a tightness test and a starting time test, but the power plant does not have a pressing tool capable of carrying out the work, and at present, the maintenance of the valve mainly depends on the maintenance test of returning German manufacturers, so that the working efficiency of the nuclear power plant is influenced, and the maintenance cost is high.
Disclosure of Invention
The invention aims to provide a system and a method for testing the performance of a main valve of an MTU956 diesel engine, which aim to solve the technical problem that the test time of the main valve is too long in the prior art; and solves the problem of high production cost in the prior art.
The technical scheme adopted for solving the technical problems is as follows:
the system is characterized by comprising a tightness test system and an opening time test system, wherein the tightness test system comprises a gas source quick connector for providing compressed air for the whole tightness test system, a two-position three-way electromagnetic valve for dividing the compressed air into two paths, a first pressure pipeline and a second pressure pipeline which are respectively connected with a pilot gas hole Z and a flange P of the main valve, and a pressure meter M3 communicated with a blind plate of the main valve, wherein a pressure reducing valve and a pressure meter M1 are sequentially arranged on the first pressure pipeline from the two-position three-way electromagnetic valve to the main valve, and a pressure meter M2 is arranged on the second pressure pipeline;
the opening time testing system comprises a 24V direct current power supply for supplying power to a position relation sensor S of the two-position three-way electromagnetic valve and the main valve at the same time, and a oscillograph connected with the two-position three-way electromagnetic valve and the main valve at the same time.
Further preferably, the pressure of the compressed air connected to the air source quick connector is 38-42 bar.
Further, the pressure of the compressed air connected to the air source quick connector is 40bar.
Further, the pressure reducing valve reduces the pressure of compressed air to 6-7bar, and the compressed air is introduced into the pilot air hole Z to drive the mechanical pilot mechanism of the main valve.
Further, the main valve is a piston type pneumatic pilot valve.
In addition, a hollow switch is arranged on a communication wire between the 24V direct current power supply and the two-position three-way electromagnetic valve.
More preferably, the main valve comprises a push rod, a piston, a valve body, a spring, a limit sleeve, an upper slide valve, a lower slide valve, a guide bushing, an end cover, a slide valve rod, a valve position switch, a sealing ring, an exhaust valve and a handle.
A test method of a main valve performance test system of an MTU956 diesel engine, comprising the steps of:
s1, judging tightness of a main valve: closing the two-position three-way electromagnetic valve, wherein the indication number of the pressure gauge M1 and the pressure gauge M3 is 0bar; maintaining the reading of the pressure gauge M2 at 40bar, maintaining the pressure for 5min, and using leakage detection liquid to detect leakage of the main valve; if the pressure of the pressure gauge M2 is stable and the pressure gauge M1 and the pressure gauge M3 are unchanged, judging that the main valve has good tightness;
s2, testing the opening time of the main valve: the power supply is opened, the pressure reducing valve is regulated, the pressure gauge M1 displays 5bar, when the readings on the pressure gauge M2 and the pressure gauge M3 are the same, the oscillometer calculates that the time interval between the power supply of the two-position three-way electromagnetic valve and the triggering of the valve opening signal by the position relation sensor S is within 0.5S;
s3, detecting tightness of the main valve with insufficient pilot gas pressure: firstly, adjusting the pressure reducing valve until the pressure gauge M1 displays 0.5bar, namely, when the pilot gas pressure is insufficient, checking that the pressure of the pressure gauge M3 is restored to 0 and the pressure of the pressure gauge M2 is still 40bar, and ensuring that the main valve is not opened at the moment;
s4, manually testing the switching performance of the main valve, manually pressing a handle of the main valve, observing that the indication number of the pressure gauge M1 is kept to be 0, measuring the pressure of 40bar by the pressure gauge M2 and the pressure gauge M3, and triggering a valve opening signal by a valve position sensor S;
s5, rechecking: and (5) repeating the operation steps for 2-3 times in sequence, wherein if the repeated verification results are all qualified, the main valve performance is normal.
The implementation of the invention can achieve the following beneficial effects:
the invention can realize triple functions of main valve tightness test, function test and opening time test under the same platform, comprehensively verify the quality of the spare parts of the main starting valve after maintenance or newly purchased in place, and ensure the starting reliability of diesel engine equipment;
the invention has high testing precision, simple use and cost saving, the platform uses the high-precision oscillograph to test the opening time of the main starting valve, the testing precision is high, the main valve does not need to return to foreign factories, the production cost is reduced, and the maintenance time is saved.
The invention has strong expandability. The platform can be used for testing the main starting valve after overhauling, analyzing and comparing the reasons of the defects of the main starting valve, and can realize verification of other similar valves by adjusting the size and the air pressure of each interface, so that the platform is strong in expansibility and wide in application range.
Drawings
FIG. 1 is a schematic diagram of a system for testing the main valve performance of an MTU956 diesel engine according to the present invention;
fig. 2 is a schematic structural view of a main valve according to the present invention.
Reference numerals of the specific embodiments illustrate:
1-an air source quick connector; 2-two-position three-way electromagnetic valve; 3-a pilot air hole Z; 4-flange P; 5-pressure pipe I; 6-a second pressure pipeline; 7-a main valve; 71-ejector pins; 72-a piston; 73-valve body; 74-springs; 75-limiting sleeve; 76-upper slide valve; 77-lower spool valve; 78-guiding bushings; 79-end cap; 80-a spool stem; 81-valve position switch; 82-sealing rings; 83-exhaust valve; 84-handle; 8-a pressure reducing valve; 9-a pressure gauge M1; 10-pressure gauge M2; 11-blind plates; 12-pressure gauge M3; 13-a positional relationship sensor S; 14-a recorder; 15-24V DC power supply; 16-open.
Detailed Description
For a clearer understanding of technical features, objects and effects of the present invention, a detailed description of embodiments of the present invention will be made with reference to the accompanying drawings. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The utility model provides a MTU956 diesel engine main valve performance test system, as shown in FIG. 1, including leakproofness test system and opening time test system, leakproofness test system includes air supply quick-operation joint 1 for whole leakproofness test system provides compressed air, divide into two-way two-position three way solenoid valve 2 with compressed air, and pressure pipe one 5 and pressure pipe two 6 that link to each other with the guide's gas pocket Z3 and flange P4 of main valve 7 respectively, still include the manometer M312 that communicates with the blind flange 11 of main valve 7, be equipped with relief pressure valve 8 and manometer M19 on the pressure pipe one 5 in order from two-position three way solenoid valve 2 to main valve 7, be equipped with manometer M210 on the pressure pipe two 6, relief pressure valve 8 drops compressed air to 6-7bar, after leading gas pocket Z3, be used for driving the mechanical guide of main valve 7.
The open time test system includes a 24V dc power supply 15 for supplying power to the positional relationship sensor S13 of the two-position three-way electromagnetic valve 2 and the main valve 7 at the same time, and a oscillograph 14 connected to the two-position three-way electromagnetic valve 2 and the main valve 7 at the same time. The pressure of the compressed air connected into the air source quick connector 1 is 38-42 bar, the pressure of the compressed air connected into the air source quick connector 1 is preferably 40bar, and an air switch 16 is arranged on a communication wire between the 24V direct current power supply 15 and the two-position three-way electromagnetic valve 2.
The main valve 7 is a piston type pneumatic pilot valve, as shown in fig. 2, the main valve 7 includes a carrier 71 for manually operating a valve drive, a piston 72 for receiving a pneumatic drive, a valve body 73, a spring 74 for providing a restoring valve sealing force, a stop collar 75 for limiting a piston limit position, an upper spool 76 for pilot valve action, a lower spool 77 for opening/shutting off compressed air, a guide bush 78 for guiding a direction of movement of a lower spool piston, an end cap 79 for sealing the valve body and limiting the direction of movement of the lower spool piston, a spool rod 80 for guiding the direction of movement of the lower spool piston, a valve position switch 81 for feeding back whether the valve is completely opened, a seal ring 82 for sealing, an exhaust valve 83 for exhausting residual compressed air, and a handle 84 for manually operating the valve.
A test method of a main valve performance test system of an MTU956 diesel engine, comprising the steps of:
s1, judging the tightness of the main valve 7: closing the two-position three-way electromagnetic valve 2, wherein the numbers of the pressure gauge M19 and the pressure gauge M312 are 0bar; maintaining the reading of the pressure gauge M210 at 40bar, maintaining the pressure for 5min, and using leakage detection liquid to detect leakage of the main valve 7; if the pressure of the pressure gauge M210 is stable and the pressure gauge M19 and the pressure gauge M312 are unchanged, judging that the tightness of the main valve 7 is good;
s2, testing the opening time of the main valve 7: the power supply idle switch 16 is opened, the pressure reducing valve 8 is regulated, when the pressure gauge M19 displays 5bar and the readings on the pressure gauge M210 and the pressure gauge M312 are the same, the oscillograph 14 calculates that the time interval between the power supply of the two-position three-way electromagnetic valve 2 and the triggering of the valve opening signal by the position relation sensor S13 is within 0.5S;
s3, detecting tightness of the pilot gas pressure deficiency main valve 7: firstly, regulating the pressure reducing valve 8 to the pressure gauge M19 to display 0.5bar, namely, when the pilot gas pressure is insufficient, checking that the pressure of the pressure gauge M312 is restored to 0 and the pressure of the pressure gauge M210 is still 40bar, and ensuring that the main valve 7 is not opened at the moment;
s4, manually testing the switching performance of the main valve 7, manually pressing a handle 84 of the main valve 7, observing that the indication number of the pressure gauge M19 is kept to be 0, measuring the pressure of 40bar by the pressure gauge M210 and the pressure gauge M312, and triggering a valve opening signal by a valve position sensor S;
s5, rechecking: and repeating the operation steps for 2-3 times in sequence, and if the repeated verification results are all qualified, indicating that the performance of the main valve 7 is normal.
The embodiments of the present invention have been described above with reference to the accompanying drawings, but the present invention is not limited to the above-described embodiments, which are merely illustrative and not restrictive, and many forms may be made by those having ordinary skill in the art without departing from the spirit of the present invention and the scope of the claims, which are to be protected by the present invention.
Claims (6)
1. The system for testing the performance of the main valve of the MTU956 diesel engine is characterized by comprising a tightness testing system and an opening time testing system, wherein the tightness testing system comprises a gas source quick connector (1) for providing compressed air for the whole tightness testing system, a two-position three-way electromagnetic valve (2) for dividing the compressed air into two paths, a first pressure pipeline (5) and a second pressure pipeline (6) which are respectively connected with a pilot gas hole Z (3) and a flange P (4) of a main valve (7), and a pressure meter M3 (12) communicated with a blind plate (11) of the main valve (7), a pressure reducing valve (8) and a pressure meter M1 (9) are sequentially arranged on the first pressure pipeline (5) from the two-position three-way electromagnetic valve (2) to the main valve (7), and a pressure meter M2 (10) is arranged on the second pressure pipeline (6);
the opening time test system comprises a 24V direct current power supply (15) for supplying power to a position relation sensor S (13) of the two-position three-way electromagnetic valve (2) and the main valve (7) at the same time, and a oscillograph (14) connected with the two-position three-way electromagnetic valve (2) and the main valve (7) at the same time;
the main valve (7) comprises a push rod (71) for manually operating valve transmission, a piston (72) for bearing pneumatic transmission, a valve body (73), a spring (74) for providing restoring valve sealing force, a limit sleeve (75) for limiting the limit position of the piston, an upper slide valve (76) for pilot valve action, a lower slide valve (77) for opening/cutting off compressed air, a guide bushing (78) for guiding the action direction of the lower slide valve piston, an end cover (79) for sealing the valve body and limiting the action direction of the lower slide valve piston, a slide valve rod (80) for guiding the action direction of the lower slide valve piston, a valve position switch (81) for feeding back whether the valve is completely opened, a sealing ring (82) for sealing, an exhaust valve (83) for exhausting residual compressed air and a handle (84) for manually operating the valve;
the pressure of compressed air connected to the air source quick connector (1) is 38-42 bar.
2. An MTU956 diesel engine main valve performance test system as set forth in claim 1, wherein: the pressure of the compressed air connected into the air source quick connector (1) is 40bar.
3. An MTU956 diesel engine main valve performance test system as set forth in claim 1, wherein: the pressure reducing valve (8) reduces the pressure of compressed air to 6-7bar, and the compressed air is introduced into the pilot air hole Z (3) to drive the mechanical pilot mechanism of the main valve (7).
4. An MTU956 diesel engine main valve performance test system as set forth in claim 1, wherein: the main valve (7) is a piston type pneumatic pilot valve.
5. An MTU956 diesel engine main valve performance test system as set forth in claim 1, wherein: an empty switch (16) is arranged on a communication wire between the 24V direct current power supply (15) and the two-position three-way electromagnetic valve (2).
6. The test method of the main valve performance test system of the MTU956 diesel engine according to any one of claims 1 to 5, comprising the following steps:
s1, judging the tightness of a main valve (7): closing the two-position three-way electromagnetic valve (2), wherein the numbers of the pressure gauge M1 (9) and the pressure gauge M3 (12) are 0bar; the indication of the pressure gauge M2 (10) is maintained at 40bar, the pressure is maintained for 5min, and the leakage of the main valve (7) is detected by using leakage detection liquid; if the pressure of the pressure gauge M2 (10) is stable and the pressure gauges M1 (9) and M3 (12) are unchanged, judging that the tightness of the main valve (7) is good;
s2, testing the opening time of a main valve (7): the power supply is opened (16), the pressure reducing valve (8) is regulated, when the pressure gauge M1 (9) displays 5bar and the numbers displayed on the pressure gauge M2 (10) and the pressure gauge M3 (12) are the same, the oscillograph (14) calculates that the time interval between the power acquisition of the two-position three-way electromagnetic valve (2) and the triggering of the valve opening signal by the position relation sensor S (13) is within 0.5S;
s3, detecting tightness of the pilot air pressure deficiency main valve (7): firstly, regulating the pressure reducing valve (8) to the pressure gauge M1 (9) to display 0.5bar, namely, checking that the pilot gas pressure is insufficient at the moment, the pressure of the pressure gauge M3 (12) is restored to 0, and the pressure of the pressure gauge M2 (10) is still 40bar, so that the main valve (7) is ensured not to be opened at the moment;
s4, manually testing the switching performance of the main valve (7), manually pressing a handle (84) of the main valve (7), observing that the indication number of the pressure gauge M1 (9) is kept to be 0, measuring the pressure of 40bar by the pressure gauge M2 (10) and the pressure gauge M3 (12), and triggering a valve opening signal by a valve position sensor S;
s5, rechecking: and (3) repeating the operation steps for 2-3 times in sequence, wherein if the repeated verification results are all qualified, the main valve (7) has normal performance.
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| CN110987444B (en) * | 2019-12-13 | 2021-06-08 | 贵州航天计量测试技术研究所 | Calibration device and calibration method for time zero of multi-parameter test system |
| CN111596148B (en) * | 2020-04-16 | 2022-08-09 | 岭东核电有限公司 | Test method, device and equipment for starting diesel engine in case of power failure of emergency bus of nuclear power station |
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