JB/T 50033-1999 Internal combustion engine cooling water pump bench reliability assessment
Some standard content:
Mechanical Industry Standard of the People's Republic of China
FBT5033-1999
Cooling Water Pump
Internal Combustion Engine
Bench Reliability Assessment
(Internal Use)
Published on December 30, 1999
National Bureau of Machinery Industry
Implementation on June 1, 2000
[B/T 50033-1999
This standard is a revision of JB50033-1999 "Internal Combustion Engine Cooling Water Pump Bench Reliability Assessment": During the revision, the standard was revised, and the main technical content remained unchanged. This standard replaces JB50033-1994 from the date of implementation. Appendix A, Appendix B, and Appendix C of the standard are all informative appendices. Appendix D of the minor standard is the standard appendix, and the minor standard is formulated and approved by the National Technical Committee for Standardization of Internal Combustion Engines. The originator of this standard is China Internal Combustion Engine Research Institute. The main author of this standard is Xu Zhisheng.
This standard was first issued in 1994
Mechanical Industry Standard of the People's Republic of China
Internal Combustion Engine Cooling Water Pump
Reliability Assessment of Bench
(Internal Use)
JB/T50033—1999
B:T 5003—94
This standard defines the reliability assessment method of cooling water pump for small and medium-sized internal combustion engines, and the test results, classification and judgment rules of several chapters
This standard is applicable to the reliability assessment of cooling water pump for small and medium-sized internal combustion engines (hereinafter referred to as water pump) produced in batches. 2 Referenced Standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. This standard is correct, the requested version is valid, all standards will be reviewed, please use the components of this standard to discuss the possibility of using the latest version of the following standards JB: T126.2-1999 Internal Combustion Engine Cooling Water Pump Performance Test Method 6 3 Evaluation Method
3.1 Reliability Assessment Index
3.1.1 Mean Time Before First Failure (MTTFE) -a) Point estimate is:
-Test sample coefficient;
-The average value of the accumulated working time when the first failure occurs, h: ( :
Number of units that have first failure (minor failures are not counted) in the test sample: 1-the cumulative working time of the first sample when the first failure occurs, b: the cumulative working time of the remaining samples that have not failed at the end of the sequential test, h; acceleration factor, 4-3.
Calculation: When the test results are obtained, the MITFF of the total product is the time, the end system and the test sample collection strategy, 6? The lower limit of the one-sided confidence interval of the mean working time before the first failure with a confidence level of 1 is estimated as follows: (MTTF)
Formula: 9-risk coefficient "or significant level! x:, 21:
x'te iria
Confidence level (1), degree of freedom () is 2r+2 distribution quantile, can be obtained from the distribution score table of A (provided in the attached).
Is the average working time between two consecutive failures: 6:3.1.2 Mean time between failures (MTDF) Approved by the State Machinery Industry Bureau on November 30, 1999, implemented on June 1, 2000
a) The point estimate is:
Is the test sample system score:
JB/T50033-1999
Is the average working time between two consecutive failures: 6:3.1.2 Mean time between failures (MTDF) Approved by the State Machinery Industry Bureau on November 30, 1999, implemented on June 1, 2000
a) The point estimate is:
Is the test sample system score:
JB/T50033-1999
Is the average working time between two consecutive failures: , the sample multiplied by the working time, h: the test cut-off time determined by the time-limited test, 1\—the total number of failures (minor failures) occurring within the test cut-off time: Note: When the test result is r=>「, the BF performance of the product is calculated according to the test time, the product of the continuity coefficient and the number of test units. The single confidence lower limit estimate of the mean time between failures with a confidence level of (1-) is: (MTBP) E.1
3.1.3 Comprehensive score for fault-free performance (】—is a comprehensive evaluation index for product fault-free performance. 0-10- NT)(x,)
Where: (MTBF)—the MTBF daily standard value that the specified water pump product should reach, h; the total number of failures of the sample occurring within the test deadline (including the performance test period): F
The failure hazard coefficient of each failure, the hazard coefficients of various failures are as follows: Severe failure K,=G0
General failure K,=30
Minor failure K-9
The time of occurrence of the first failure is 27.
Where: T—the cumulative working time of the sample when the first failure occurs, h, Note: When the calculation result 2<0. When -0, 2-1003, Reliability Assessment Method
The reliability assessment of water pump products is carried out through two aspects, such as bench reliability test and user survey. 3.2.1 Bench reliability test 1.2.1.1 The bench reliability test shall be conducted in accordance with the provisions of Chapter 4. 3.2.1.2 The assessment indicators are the mean half time to first fault (MTTFF), the mean time between failures (MTEF) and the comprehensive score of fault-free performance (9). 3.2.2 User survey 3.2.1.1 The user survey shall focus on investigating the actual reliability of the pump in normal use by users, exploring the main fault patterns that occur during use, and calculating the average working time before the first fault during product use. 3.2.2.2 The user survey shall be carried out together with the user survey report, and a certificate with the official seal of the investigated unit shall be attached. 3.3 Fault determination Each fault that occurs during the bench reliability test shall be determined one by one in accordance with the provisions of Chapter 5. 2
3.4 Reliability assessment
JB/T50033-1999
3.4.1 After the assessment of the water-jet product is completed according to the provisions of 3.2, all the assessment indicators should be calculated according to the calculation formula in 3.1, and the product reliability assessment report should be written.
3.4.2 When the reliability test indicators of the product all meet the specified target values, the reliability level of the product is assessed. If any of the assessment indicators do not meet the specified target values, the product will not pass the reliability assessment. 4 Test methodbzxz.net
4. 1 Test sample pump
4.1.1 The sample pump should meet the requirements of the product sample and relevant technical documents. 4.1.2 The micro pump selection system should be the following inspection products: 1.1.3 The inspection style is random sampling method: When the manufacturer makes the sample, the sample time is not less than 100 units; When the user unit or market sweeps the sample, it must be within 1 year! The product has no limit on the number of stocks. 4.1.4 The number of test samples is 2 units, and the number of samples is 3 units. One of them is used as a spare sample pump to be used after the normal inspection in case of problems other than the sample pump itself.
4.2 Test items and methods
4.2.1 Performance test
Before the bench test, the head and shaft speed of the pump under the calibrated working condition should be measured according to B/T81262. 4.2.2 Bench test
4.2.2. 1 The feasibility test device is shown in Figure 1, 18
1-left flow motor: 2-tested water: 3-difference: 4-inlet pressure gauge: 5-inlet water: 6-water inlet network: 7: hot water: R-water discharge: 4-water outlet: 10-sealed box: 11-water level gauge: 12-compressed air valve; 13-installation ditch: 14-vacuum pressure gauge: 15-air diffuser, 16-gauge, 17-outlet pressure chamber: 1R-water pipe diagram! Test device schematic diagram
4.2.1.2 Test specification
JH/T50033-1999
! The water test speed is 1.1 times the calibrated speed and is rounded to the nearest digit. The time from zero to the test speed is 155, maintained at 309, and the total number of cycles from the test speed to the test speed is 5%, and the total number of cycles is 3×1 (00) 4.2.2.3 Test conditions
a) The test medium is clean water, the water temperature is 953, and the temperature of the temperature gauge should not exceed! Level: b) The water pump is driven by a belt, and the gear-driven water pump can be transmitted to the test
! The water tank is cut off and the pressure of the refrigeration system is equal to the vacuum pressure of the water system. It is assumed that the dry level is not low:
) The water recording test should be equipped with a weight plate: the calculation of the amount of the equipment and the wind speed are different, and the uneven size of the equipment is specified in the table [specified,
*= t0k
equipped with a balance sheet
) The head of the water pump test speed is H
>400~500
56 ±3
H-() v
In it: the head of the ice system test, m: a water test speed, rmn;
calculate the remaining calibration speed, r/min:
water is calibrated when it is turned through, and.
「】Allowable head difference
Cumulative number of cycles ±50:
Water pump test speed -1%;
Water humidity ±2%:
Water flow rate at the test speed ±15%. 4.2.1. Measurement of water discharge from the water pump drain hole sntl-4xk:
72 - 5
Use a small container to collect the leakage from the water hole. To prevent the upper container from leaking too much oil, add some oil to the container end and use the method to measure the leakage from the water hole.
4.2.2.5 Test record
Measure the water pump speed, water temperature, inlet pressure, outlet pressure difference, cumulative cycle times, stop the machine for 1 minute, observe the leakage from the water pump water hole, and make a record. During the test, any faults should be recorded at any time and stored in the Appendix R! Appendix) Cooling water table for performance test. Statistics are made according to Chapter 5
4. 2. 3 Performance retest
JB/T50033—1999
The sample should be placed for at least 24 hours after the non-performance test. The performance retest should be carried out as specified in 4.21: 4.2.4 Check whether the parts are damaged
4.3 Test requirements
The thermal test is summarized as follows: a) Record the fault record table of the cold water system performance test results (attached with the prompt): 5. Fault classification and judgment rules
5. tFault classification
An event or phenomenon that causes the pump to fail to perform its specified functions during use is called a fault. The fault is classified into severe fault, general fault and mild fault according to the severity and severity of the fault.
5.1. Severe fault
Fault indicating that the pump is not functioning properly. 5. 1. 2
Equipment (Chuan capital:
refers to the fault of the environmental performance of the report recording part: the fault exceeds the prescribed allowable limit. 5.1.3 Degree fault (V category)
refers to the fault that is not dismantled, that is, non-age,
5.2 Fault judgment rules
5.2.1 The fault category can be judged by the attached [(standard can be shown), and the structure of the water system has differences. If it is found that the fault elimination method is not suitable for the original plan, some principles can be accumulated, and the examples in the attached can be used to determine its type. 5.2.2 After the fault is eliminated, the fault will reappear. The total number of faults should be counted, 5 .2.3 Calculate the time of efficiency degradation by the cumulative working time when the pump fails. At the beginning of the test, the total time the pump has been running is
5.2.4 If any fault is found during the performance verification and maintenance inspection after the test is completed, the cumulative working time of the pump shall be calculated according to the cumulative working time of the pump. 1. JBrTS0033—1999 Appendix A (Appendix A for pumps with indications) Distribution quantile table: (,) rlu543.4.594.12 002
12 857
13 716
14 578
.1.386
3 hot 7
14 339
16 222
.38418
22 775
23 900
22 352
sexual instant
appearance time
tester
lan product)
tester
policy complaint number
deep accumulation
x (b)
5n033—1990
Appendix 8
(Appendix of suggestion)
Cooling water tea bench reliability test fault record table product model
test exemption person
Appendix Record C
Remedy
Image summary
Time:
Monitoring start and end date
(Appendix for reminder)
Summary of cooling water pump performance test results
Product model
Tester
Water pump shaft efficiency
Test person
Inspection 1. Condition
Test start and end date
Calibration information|| tt||Cause analysis
Factory release period
Factory release period
Test results
Test data
JB/T50033—1999
Appendix D
(Standard Appendix)
Classification table of fault modes of cooling water system of internal combustion engine. Classification table of fault modes of cooling water system of internal combustion engine is shown in Table D, Category
Science and technology
Squeeze process reduction
Shaft power|| tt||Fat double ratio water sliding
Water sliding hole water sliding
Water drain hole water drain
Combination surface condensation
Situation matching said
Dynamic effect, etc.
Bright body, combined with other places
Performance recovery, process comparison test>1c%
When the rate comparison test
1g special pool water≤10g
<Cumulative water volume 1
No explanation can be eliminated
Sound slip at the bearing2 After the fault is eliminated, the total number of failures should be counted. 5.2.3 Calculate the time of occurrence of efficiency degradation. The cumulative working time when the pump fails is calculated. At the beginning of the test, the total system time is
5.2.4 If any fault is found during the performance verification and maintenance inspection after the test is completed, the cumulative working time of the pump shall be calculated according to the cumulative working time of the pump. JBrTS0033—1999 Appendix A (Appendix A for pumps with indications) Distribution quantile table: (,) rlu543.4594.12002.12857.13716.1414.1 578
.1.386
3 heat 7
14 339
16 222
.38418
22 775
23 900
22 352
sexual instant
appearance time
tester
production)
tester
policy complaint times
deep accumulation work
x (b)
5n033—1990
Appendix 8
(Appendix of suggestion)
Cooling water tea bench reliability test fault record table production model
test exemption person
Appendix Record C
Remedy
Image summary
Time:
Monitoring start and end date
(Appendix for reminder)
Summary of cooling water pump performance test results
Product model
Tester
Water pump shaft efficiency
Test person
Inspection 1. Condition
Test start and end date
Calibration information|| tt||Cause analysis
Factory release period
Factory release period
Test results
Test data
JB/T50033—1999
Appendix D
(Standard Appendix)
Classification table of fault modes of cooling water system of internal combustion engine. Classification table of fault modes of cooling water system of internal combustion engine is shown in Table D, Category
Science and technology
Squeeze process reduction
Shaft power|| tt||Fat double ratio water sliding
Water sliding hole water sliding
Water drain hole water drain
Combination surface condensation
Situation matching said
Dynamic effect, etc.
Bright body, combined with other places
Performance recovery, process comparison test>1c%
When the rate comparison test
1g special pool water≤10g
<Cumulative water volume 1
No explanation can be eliminated
Sound slip at the bearing2 After the fault is eliminated, the total number of failures should be counted. 5.2.3 Calculate the time of occurrence of efficiency degradation. The cumulative working time when the pump fails is calculated. At the beginning of the test, the total system time is
5.2.4 If any fault is found during the performance verification and maintenance inspection after the test is completed, the cumulative working time of the pump shall be calculated according to the cumulative working time of the pump. JBrTS0033—1999 Appendix A (Appendix A for pumps with indications) Distribution quantile table: (,) rlu543.4594.12002.12857.13716.1414.1 578
.1.386
3 heat 7
14 339
16 222
.38418
22 775
23 900
22 352
sexual instant
appearance time
tester
production)
tester
policy complaint times
deep accumulation work
x (b)
5n033—1990
Appendix 8
(Appendix of suggestion)
Cooling water tea bench reliability test fault record table production model
test exemption person
Appendix Record C
Remedy
Image summary
Time:
Monitoring start and end date
(Appendix for reminder)
Summary of cooling water pump performance test results
Product model
Tester
Water pump shaft efficiency
Test person
Inspection 1. Condition
Test start and end date
Calibration information|| tt||Cause analysis
Factory release period
Factory release period
Test results
Test data
JB/T50033—1999
Appendix D
(Standard Appendix)
Classification table of fault modes of cooling water system of internal combustion engine. Classification table of fault modes of cooling water system of internal combustion engine is shown in Table D, Category
Science and technology
Squeeze process reduction
Shaft power|| tt||Fat double ratio water sliding
Water sliding hole water sliding
Water drain hole water drain
Combination surface condensation
Situation matching said
Dynamic effect, etc.
Bright body, combined with other places
Performance recovery, process comparison test>1c%
When the rate comparison test
1g special pool water≤10g
<Cumulative water volume 1
No explanation can be eliminated
Sound slip at the bearing
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