JB/T 11880.5-2014 PDF English
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Diesel engines - Selective catalytic reduction (SCR) systems - Part 5: Urea solution injectors
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JB/T 11880.5-2014: PDF in English (JBT 11880.5-2014) JB/T 11880.5-2014
JB
MECHANICAL INDUSTRY STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
ICS 27.020
J 93
Filing number: 47529-2014
Diesel engines - Selective catalytic reduction (SCR)
systems - Part 5: Urea solution injectors
ISSUED ON: JULY 09, 2014
IMPLEMENTED ON: NOVEMBER 01, 2014
Issued by: Ministry of Industry and Information Technology of PRC
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Terms and definitions ... 5
4 Type and model ... 6
4.1 Type ... 6
4.2 Model ... 7
5 Technical requirements ... 7
5.1 Technical requirements for airless urea solution injectors ... 7
5.2 Technical requirements for air-assisted urea solution injectors ... 13
6 Test method ... 15
6.1 Test method for injector for airless urea solution ... 15
6.2 Test method for air-assisted urea solution injector ... 20
7 Inspection rules ... 24
7.1 Qualified documents and marking ... 24
7.2 Product inspection category ... 24
7.3 Exit-factory inspection ... 24
7.4 Type inspection ... 24
7.5 Sampling inspection ... 26
8 Marking, packaging, transportation, storage ... 26
8.1 General ... 26
8.2 Marking ... 26
8.3 Packaging ... 27
8.4 Transportation ... 27
8.5 Storage ... 27
Diesel engines - Selective catalytic reduction (SCR)
systems - Part 5: Urea solution injectors
1 Scope
This part of JB/T 11880 specifies the terms and definitions, type and model,
technical requirements, test methods, inspection rules, marking, packaging,
transportation, storage of urea solution injectors in the selective catalytic
reduction (SCR) system for diesel engines...
This part applies to jet injectors for urea solution.
2 Normative references
The following documents are essential to the application of this document. For
the dated documents, only the versions with the dates indicated are applicable
to this document; for the undated documents, only the latest version (including
all the amendments) are applicable to this standard.
GB/T 2423.1 Environmental testing - Part 2: Test methods - Tests A: Cold
GB/T 2423.2 Environmental testing - Part 2: Test methods - Tests B: Dry heat
GB/T 2423.8 Environmental testing for electric and electronic products Part
2: Test methods Test Ed: Free fall
GB/T 2423.10 Environmental testing for electric and electronic products -
Part 2: Tests methods - Test Fc: Vibration (sinusoidal)
GB/T 2423.30 Environmental testing - Part 2: Test methods - Test XA and
guidance: Immersion in cleaning solvents
GB/T 2828.1 Sampling procedures for inspection by attributes - Part 1:
Sampling schemes indexed by acceptance quality limit (AQL) for lot-by-lot
inspection
GB/T 10125 Corrosion tests in artificial atmospheres - Salt spray tests
GB/T 13277.1-2008 Compressed air - Part 1: Contaminants and purity
classes
GB/T 13384 General specifications for packing of mechanical and electrical
product
GB/T 16538-2008 Acoustics - Determination of sound power levels of noise
sources using sound pressure - Comparison method in situ
GB/T 17619 Limits and methods of testing for immunity of electrical /
electronic sub-assemblies in vehicles to electromagnetic radiation
GB 18655 Limits and methods of measurement of radio disturbance
characteristics for the protection of receivers used on board vehicles
GB/T 25363 Electromechanical solenoid fuel injector assemblies of gasoline
engines - Testing methods
SH 0004 Solvent oil for use in rubber industry
QC/T 413-2002 Basic technical requirements for automotive electric
equipment
ISO 22241-1 Diesel engines - NOx reduction agent AUS 32 - Part 1: Quality
requirements first edition
SAE J2044 Quick connect coupling specification for liquid fuel and
vapor/emissions systems
3 Terms and definitions
The following terms and definitions apply to this document.
3.1
Urea solution injector
A device for injecting urea solution into the exhaust pipe of an engine, which
includes two types: an air-assisted urea solution injector and an airless urea
solution injector.
3.2
Airless urea solution injector
A device in which a certain amount of urea solution is directly injected into
the exhaust pipe of the engine by a control valve.
3.3
Airless urea solution injector assembly
5.1.2.2 Torsion strength
5.1.2.2.1 Apply a torsion torque of 6.0 N • m to both ends of the injector
assembly; the injector shall not be deformed after 5 s.
5.1.2.2.2 After the test, the tightness of the injector shall meet the requirements
specified in 5.1.8; the flow consistency shall meet the requirements specified in
5.1.13.
5.1.2.3 Bending strength
5.1.2.3.1 Simultaneously apply a bending moment of 4.0 N • m to both ends of
the longitudinal axis of the injector assembly; it shall not deform after 30 s.
5.1.2.3.2 After the test, the tightness of the injector shall meet the requirements
specified in 5.1.8; the flow consistency shall meet the requirements specified in
5.1.13.
5.1.3 Vibration resistance
5.1.3.1 During the vibration test, there shall be no damage to the parts of the
injector and no loosening or falling off of the fasteners.
5.1.3.2 After the test, the tightness of the injector shall meet the requirements
specified in 5.1.8; the flow consistency shall meet the requirements specified in
5.1.13.
5.1.4 Pressure resistance
5.1.4.1 During the pressure resistance test, there shall be no deformation or
rupture of the injector.
5.1.4.2 After the test, the tightness of the jet injector shall meet the requirements
specified in 5.1.8; the consistency of the flow view shall meet the requirements
specified in 5.1.13.
5.1.5 Salt spray resistance
5.1.5.1 After the salt spray test, the outer surface of the injector shall be clean
and there shall be no signs of corrosion.
5.1.5.2 After the test, the tightness of the injector shall meet the requirements
specified in 5.1.8.
5.1.6 Resistance to industrial solvents
5.1.6.1 After the end of the industrial solvent resistance test, there shall be no
corrosion marks, cracks, discoloration and other abnormal phenomena on the
outer surface of the injector.
5.2 Technical requirements for air-assisted urea solution
injectors
5.2.1 General requirements
5.2.1.1 The appearance of the injector shall not have defects such as rust spots,
knocks, etc. The size of the injector shall be manufactured in accordance with
the product drawings and technical documents approved by the prescribed
procedures.
5.2.1.2 The parts of the injector shall be complete, and the trademark shall be
clear.
5.2.1.3 When using the urea solution for vehicles as specified in ISO 22241-1,
the injector shall work normally.
5.2.1.4 The fluid piping joints of the injector meet the requirements of SAE
J2044.
5.2.2 Strength performance
5.2.2.1 Apply an axial pressure of 600 N to the longitudinal axis of the injector,
the injector shall not be deformed after 60 s.
5.2.2.2 Apply a torsion torque of 6.0 N • m at both ends of the injector, the
injector shall not be deformed after 5 s.
5.2.2.3 Simultaneously apply a bending moment of 4.0 N • m at both ends of
the longitudinal axis of the injector, the injector shall not be deformed after 30
s.
5.2.3 Vibration resistance
After the vibration test, there shall be no damage to parts and fasteners; there
is no loosening or falling off of fasteners.
5.2.4 Pressure resistance
The inside of the injector shall be able to withstand 1.5 times the maximum
working pressure for 1 min. During the test, the injector has no deformation or
rupture.
5.2.5 Salt spray resistance
After the salt spray test, the outer surface of the injector is clean and there is
no trace of corrosion.
6.1.4.3.1 Install the injector assembly on the bending moment test bench. Apply
a bending moment of 4.0 N • m to the injector assembly for 30 s.
6.1.4.3.2 Observe whether the injector is deformed.
6.1.4.3.3 Then carry out the tests as specified in 6.1.10 and 6.1.15.
6.1.5 Vibration resistance test
6.1.5.1 According to the provisions of GB/T 2423.10, fix the injector assembly
on the vibration test bench according to the normal installation position; perform
the sinusoidal vibration test in the three directions of X, Y, Z.
6.1.5.2 Under the conditions of 10 Hz ~ 2000 Hz random frequency conversion
and 30 g acceleration, perform longitudinal and lateral vibration for 48 h
6.1.5.3 After the end of the test, observe whether the parts of the injector
assembly are loose; then perform the tests as specified in 6.1.10 and 6.1.15.
6.1.6 Pressure resistance test
6.1.6.1 Connect the injector inlet to the hydraulic test bench; start the test bench
to slowly increase the pressure to 1.5 times the maximum working pressure;
hold this pressure for 1 min.
6.1.6.2 Observe whether the injector is deformed or broken.
6.1.6.3 After the end of the test, perform the tests as specified in 6.1.10 and
6.1.15.
6.1.7 Salt spray resistance test
6.1.7.1 Carry out the salt spray resistance test according to GB/T 10125.
6.1.7.2 Place the injector assembly in the salt spray chamber for continuous 96-
hour salt spray resistance (sodium chloride solution with a mass fraction of 5%)
test.
6.1.8 Industrial solvent resistance test
6.1.8.1 Carry out test in accordance with the requirements of the corresponding
test method in GB/T 2423.30.
6.1.8.2 The recommended reagents are vehicle urea solution, brake fluid,
engine oil, diesel oil or glass cleaner. The test chemical reagents shall be
negotiated and determined by the supplier and the user.
6.1.8.3 The reagent temperature is 20 °C ~ 30 °C; the injector is immersed in
the reagent for 24 hours.
According to the provisions of the corresponding test method of Be in GB/T
2423.2, set the test environment temperature to 80 °C, to perform the tests as
specified in 6.1.10 and 6.1.15.
6.1.13.2 Low-temperature resistance test
According to the provisions of the corresponding test method of Ae in GB/T
2423.1, set the test environment temperature to -40 °C to perform the tests as
specified in 6.1.10 and 6.1.15.
6.1.14 Flow linear deviation test
6.1.14.1 The reagent is vehicle urea solution; the temperature is 20 °C ~ 30 °C.
Randomly take 10 injector samples.
6.1.14.2 The pressure of the urea solution is the rated working pressure; the
injector pre-sprays 1000 times.
6.1.14.3 Set the duty cycle to 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80%;
measure the urea solution injection volume of 2000 consecutive injections of
the injector.
6.1.14.4 Use the least square method to simulate the test data. Calculate the
flow linear deviation of the injector.
6.1.15 Flow consistency test
6.1.15.1 The reagent is a urea solution for vehicles with a temperature of 20 °C
~ 30 °C. Randomly take 10 injector samples.
6.1.15.2 Install the injector on the flow test bench and set the duty cycle to 10%;
the injector continuously sprays 2000 times under the rated working pressure.
Use a utensil or a flow meter (the accuracy level is not less than 4) to measure
each spray volume.
6.1.15.3 Set the duty cycle to 20%, 30%, 40%, 50%, 60%, 70%, 80%. Replace
the injector. Repeat the above test. Obtain the flow consistency deviation under
each duty cycle.
6.1.16 Noise test
According to the relevant provisions of GB/T 16538-2008, measure the sound
power level of the injector’s noise under the rated working pressure.
6.1.17 Spray test
6.1.17.1 According to the provisions of GB/T 25363, install the injector on the
fixed support. Adjust the distance h from the injector nozzle to the center of the
6.1.20.1 The electromagnetic immunity test of the injector shall be carried out
in accordance with the relevant requirements of GB/T 17619.
6.1.20.2 The electromagnetic disturbance test of injector is carried out in
accordance with the relevant requirements of GB 18655.
6.1.21 Cleanliness test
6.1.21.1 Randomly select 10 samples of the injector. The filter membrane uses
a 0.45 µm and 5 µm microporous membrane with a diameter of more than Φ50
mm. The cleaning solution complies with the class-1 reagent oil as specified in
SH 0004. The accuracy class of the weighing analytical balance (0.1 mg) is
class 3.
6.1.21.2 The method of non-disassembly is adopted for the measurement. The
sampling location is the internal surfaces of the injector (including the needle
valve surface). Clean the outer surface of the pipeline, all sampling tools,
supports, containers, injectors. Install the injector on the test bench. The
cleaning solution entering the injector is first filtered through a 0.45 µm filter
membrane. The injector sprays 2000 times at a 50% duty cycle. Collect the
sprayed cleaning solution in the container. Use tweezers to place the weighed
5 µm microporous filter membrane for use in the clean solution to moisten it.
Place it on the sand core of the filter device. Perform suction filtration of the
cleaning solution with impurities.
6.1.21.3 After the washing solution evaporates, put the filter membrane with
impurities in an electric thermostatic drying oven at a temperature of 90 °C ±
5 °C for 1 h. Then take it out. Place it in a drying container to cool for 30 min.
Use a balance to weigh the impurities to get the mass of the impurities. After
drying and weighing twice, the second time shall prevail (the difference between
the two dryings is not more than 0.4 mg).
6.1.21.4 After weighing, use a measuring magnifying glass to measure the size
of the largest particle. Take another injector and repeat the test.
6.2 Test method for air-assisted urea solution injector
6.2.1 Test conditions
6.2.1.1 Unless there are special requirements, the injector test shall be carried
out in accordance with the requirements as specified in GB/T 25363 under the
following environmental conditions: the ambient temperature is 20°C ~ 30°C;
the relative humidity is 25% ~ 65%; the air pressure is 101.3 kPa ± 5 kPa
6.2.1.2 The vehicle urea solution used for the test shall be implemented in
accordance with ISO 22241-1.
6.2.6.3 Observe whether the injector is deformed or broken.
6.2.7 Salt spray resistance test
6.2.7.1 Carry out the salt spray resistance test according to the requirements of
GB/T 10125. The injector does not work during the test.
6.2.7.2 Place the injector in the salt spray box for continuous 96-hour salt spray
resistance (sodium chloride solution with a mass fraction of 5%) test.
6.2.8 Industrial solvent resistance test
6.2.8.1 Carry out test according to the requirements of the corresponding test
methods in GB/T 2423.30.
6.2.8.2 It is recommended to use vehicle urea solution, brake fluid, engine oil,
diesel oil or glass lotion. The chemical reagents used in the test shall be
negotiated and determined by the supplier and the user.
6.2.8.3 The temperature of the reagent is 20 °C ~ 30 °C. The injector is
immersed in the reagent for 30 min.
6.2.9 Spray test
6.2.9.1 Randomly sample 10 injectors. The reagent is a urea solution for
vehicles; the temperature is 20 °C ~ 30 °C; the injection pressure is the rated
working pressure.
6.2.9.2 Install the injector on the support of the laser particle size tester. Make
the nozzle of the injector downward. Adjust the distance h from the nozzle of
the injector to the center of the test source to be 75 mm ± 1 mm, as shown in
Figure 3.
6.2.9.3 Randomly detect the diameter of 10000 droplets from the collected
droplets and record the data.
6.2.10 Spray cone angle test
6.2.10.1 There are 6 test injector samples. The reagent is a vehicle urea
solution. The temperature is 20 °C ~ 30 °C.
6.2.10.2 According to the provisions of GB/T 25363, install the injector on the
spray test bench, so that the nozzle of the injector is downward. Perform spray
under the rated working. Use calculation method or measurement method to
obtain spray cone angle.
6.2.11.5 After weighing, use a measuring magnifying glass to measure the size
of the largest particle. Take another injector and repeat the test.
6.2.12 Flow consistency test
6.2.12.1 Randomly sample 10 injectors. The reagent is a urea solution for
vehicles. The temperature is 20°C ~ 30°C. The accuracy level of the flowmeter
is not lower than level 4.
6.2.12.2 Install the injector on the flow test bench and connect the flowmeter.
After the flow is stable, measure the flow of the injector for a duration of 2 min.
The pressure of the urea solution in the test is the rated working pressure.
6.2.12.3 Record the test results. Replace the injector, to perform the next test.
Finally calculate the injector's flow consistency deviation.
7 Inspection rules
7.1 Qualified documents and marking
Each injector product can only exit-factory after passing the inspection and
being accompanied with the product quality certificate or mark.
7.2 Product inspection category
Product inspection is divided into exit-factory inspection, type inspection,
sampling inspection.
7.3 Exit-factory inspection
The inspection items, technical requirements and test methods for the exit-
factory inspection of the airless urea solution injector shall be in accordance
with Table 1.
The inspection items, technical requirements and test methods for the exit-
factory inspection of the air-assisted urea solution injector shall be in
accordance with Table 2.
7.4 Type inspection
In one of the following situations, the manufacturer shall carry out type
inspection:
......
Source: Above contents are excerpted from the PDF -- translated/reviewed by: www.chinesestandard.net / Wayne Zheng et al.
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