JB/T 51184-2000 Reliability assessment method, test method and failure judgment of fuel injection nozzle components

JB/T 51184-2000 This standard is a revision of JB/T 51184-94 "Reliability Assessment Method, Test Method and Failure Judgment of Injection Nozzle Pairs". The revised standard has changes in the calculation of MTTF. This standard specifies the reliability assessment method, bench test method, fault classification and judgment rules for medium and small power diesel engine injection nozzle pairs. This standard is applicable to the reliability measurement and assessment of medium and small power diesel engine injection nozzle pairs. This standard was first issued in 1991 as JB/NQ 240-91, and the standard number was adjusted to JB/T 51184-94 in 1994. JB/T 51184-2000 Reliability Assessment Method, Test Method and Failure Judgment of Injection Nozzle Pairs JB/T51184-2000 Standard download decompression password: www.bzxz.net

Mechanical Industry Standard of the People's Republic of China
JB/T51184-2000
Reliability assessment of fuel injection nozzle components
Evaluation method, test method and failure judgment (internal use)
Published on 2000-03-30
National Bureau of Machinery Industry
Implementation on 20-00-01
JHT51184-2000
This standard is a revision of JB/T51184-94 "Reliability assessment of fuel injection nozzle components - evaluation method, test method and failure judgment": the original standard was revised logically during the revision. Compared with B/51[8494, this standard has the following technical changes: the formula for calculating the one-sided confidence limit of 90% confidence level when -0 is cancelled, and it is changed to when -0 is set as MTTF=2. This standard replaces JB51184-94 from the date of implementation: This standard is proposed and confirmed by the Technical Committee for Oil Nozzle Standardization, and the drafting unit of this standard is: Oil Nozzle Research Institute. The main drafters of this standard are: Zhang Li and Zhu Fen. This standard was first issued in 1991, and the standard number was adjusted to JB/T51184-94 in 1994 [Standard of the Machinery Industry of the People's Republic of China] Reliability Assessment of Injection Nozzle Pairs Evaluation Method, Test Method and Failure Judgment (Internal Use) JB/T S1184-2000 J31184-94 This standard specifies the fixed point method, bench test force method, fault classification and judgment rules for medium and small power diesel engine injection nozzle pair reliability measurement and assessment. The whole standard is used for medium and small power diesel engine injection nozzle pair reliability measurement and assessment. 2 Referenced Standards The following standards contain the provisions of this standard by citing them in this standard. When this standard is published, the versions shown are valid. All standards are subject to revision. The use of this standard should be considered when the possibility of using the underlined standard is reported. GH 252- 1994
Light nest sprinkler
TB/T72961994 Diesel engine fuel injection parts specification Diesel engine fuel injection nozzle adjustment parts performance test
JIB/T 7297—1994
[B/T511782000 Reliability assessment of synthetic spray pump assembly or load determination method, test method, fault classification and judgment rules J/T51183-2000 Reliability assessment of spray filter assembly or load determination method, test method, fault classification and judgment rules 1 Reliability assessment
3.I Reliability assessment standard (MTF)
MTTF refers to the average time before failure of spray end components, and is calculated by formula (1): MTTT.E
Wherein: MTTF is the average time before failure of a type 1 product; the number of samples that fail within the test deadline: the number of reliability test samples;
T. Test truncation time, h;
--the time when the first fuel injector nozzle pair fails, h;
--the acceleration factor, that is, the number of operating cycles of the injector assembly caused by each revolution of the oil recorder on the test bench: in the non-accelerated test, -].
When -, now TF=2
3.2 Reliability determination or assessment
The reliability determination or assessment of the spray nozzle shall be carried out through the frame test and evaluated. 3.3 Reliability evaluation
Approved by China Machinery Industry Bureau on March 30, 2000, implemented on October 1, 2000
JB/T51184—200wwW.bzxz.Net
After the reliability assessment of the product is completed, calculate its reliability index value. If these indexes are greater than or equal to the specified value, and there is a small drop in the value (no correction), it is judged to be qualified; otherwise, it is judged to be unqualified. 4. Reliability test method
4.1 Test sample In
4.1, the spray nozzle parts to be tested for reliability shall meet the requirements of product samples and related technical documents, and be inspected and qualified by the factory inspection department.
4.1.2 Sampling at the warehouse or production line of the production plant. The sample body shall not be less than 90 pairs: sampling at the user or market, no limit on the sample body. 4.1.3 Random sampling. All shall be subjected to the feasibility test. 4.2 Test conditions
4.2.1 Cold drag on the indoor bench, the test shall be carried out according to method B51178: In order to shorten the test time, the indoor bench can be used for fast cooling. The fast test can be achieved by using the method of fast oiling frequency under the condition of oil spraying process. 4.2.2 When testing with the oil pump, the speed shall be controlled according to the speed of the suction pump. During the speed test: the speed of the feasibility test bench shall be controlled at 1000/min ± 20 r/ming
4.2.3 The test oil shall be the No. 0 light oil specified in GD252. 4.2.4 The temperature of the test oil should be controlled at 40±5%. 4.3 Test conditions
The fuel injection of the diesel engine with 120% rated power is selected as the test condition 1. 4.4 Test specifications and stage inspections
The reliability assessment of the fuel injection terminal is carried out in a timed tailing test. The test time is determined by the additive coefficient K, but it must be guaranteed to be equal to (×10 times of operation cycle (aging drag)
5 Head efficiency determination || tt||During the process of sharp effect, 5 tests must be carried out at equal intervals. 5.1 If the test nozzle between the membranes is damaged, it is considered as failure and the test of the failed sample is stopped. 5.2 During the test, the test items are 3.9-3.13 in JB/T72961994, and the inspection method is in accordance with the corresponding provisions of JB/T7297. If the failure items listed in Table 1 are found, the test is stopped and the occurrence time is recorded; Table 1 Example of failure of nozzle parts| |tt||No.:
Failure items
Slight cracking of oil
Needle jamming
Spray lubrication and deterioration
Poor spray quality
Poor closeness
Tested according to D/T29 requirements, oil is not deteriorated
Tested according to the old T729 requirements, there is deflection, continuous dripping and uneven embedding of points that are easy to distinguish. The spray hole mouth is very obvious. The phenomenon of oil dripping||t t||Calculation: If the failure listed in this table occurs, the failure occurrence time can be determined according to IB/T51184-2000
6.1 The failure that can be discovered in time, that is, the exact failure time is recorded. .2 The failure that cannot be discovered in time, according to formula (2) to determine its occurrence time Tm. If a failure occurs within the time interval of ,, then the time of occurrence of the first failure is: -Tt = t.-r
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