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QC/T 793-2020
QC
AUTOMOTIVE INDUSTRY STANDARD
ICS 43.140
T 13
Replacing QC/T 793-2007
Air filter for motorcycles and mopeds
ISSUED ON. AUGUST 31, 2020
IMPLEMENTED ON. JANUARY 01, 2021
Issued by. Ministry of Industry and Information Technology of PRC
Table of Contents
Foreword... 5
1 Scope... 7
2 Normative references... 7
3 Terms and definitions... 7
4 Parameter names, symbols, units... 10
5 Requirements... 10
6 Test methods... 13
7 Inspection rules... 16
8 Marking, packaging, transportation, storage... 17
Appendix A (Normative) Calculation formula for rated air volume flow... 19
Appendix B (Normative) Test device... 20
Air filter for motorcycles and mopeds
1 Scope
This document specifies the requirements, test methods, inspection rules and marking,
packaging, transportation, storage of air filters for motorcycle and moped.
This document applies to air filters for motorcycle and moped (hereinafter referred to
as air filters), which have a rated air volume flow rate not greater than 120 m3/h. The
air filters for motorcycle which has a rated air volume flow rate of 120 m3/h or above
can also refer to this document.
2 Normative references
The contents of the following documents constitute essential provisions of this
document through normative references in the text. Among them, for dated reference
documents, only the version corresponding to the date applies to this document; for
undated reference documents, the latest version (including all amendments) applies to
this document.
GB/T 19 Pictorial marking for packing, storage, transportation
GB/T 28949 Inlet air cleaning equipment for internal combustion engines and
compressors - Performance testing
GB/T 28950.1 Road vehicles and internal combustion engines - Filter vocabulary -
- Part 1.Definitions of filters and filter components
GB/T 28950.2 Road vehicles and internal combustion engines - Filter vocabulary -
- Part 2.Definitions of characteristics of filters and their components
GB/T 28957.1 Road vehicles - Test dust for filter evaluation - Part 1.Silicon dioxide
test dust
QC/T 32 Test methods of air cleaners for automobiles
QC/T 683 Motorcycle and moped engine cleanliness limits and measurement
methods
3 Terms and definitions
The terms and definitions as defined in GB/T 28950.1 and GB/T 28950.2, as well as
the following terms and definitions, apply to this document.
3.1
Air filter with dry paper element
An air filter, which uses dry filter paper as the filter element.
3.2
Air filter with paper element louvered by engine oil
An air filter, that uses filter paper with an appropriate amount of engine oil sprayed
on the surface as the filter element.
3.3
Air filter with foam plastic filter element
An air filter, which uses a foam material soaked in an appropriate amount of engine
oil as the filter element.
3.4
Rated air volume flow
The volume of air flowing through the air filter outlet per unit time under standard
atmospheric conditions specified by the user or manufacturer. It is determined based
on the actual demand measurement and calculation of the engine. See Appendix A
for the recommended calculation formula.
3.5
Resistance
When air flows through the air filter, the static pressure value measured at the
downstream pressure measuring point of the air filter under test.
3.6
Initial resistance
For a new air filter, the static pressure value as measured at the downstream pressure
measuring point at rated air volume flow.
3.7
Filtration efficiency
The ability of the test piece to filter out specific test dust according to the prescribed
test method, which is expressed as the mass percentage (%) of the dust filtered by
the test piece to the mass of the added dust.
3.8
Initial filtration efficiency
The ability of an air filter equipped with a new filter element to filter out specific
test dust according to the prescribed test method, which is expressed as the mass
percentage (%) of the filtered dust to the mass of the added dust.
3.9
Full life filtration efficiency
The filtration efficiency measured when the test termination condition is reached,
which is evaluated by the mass percentage (%) of dust filtered by the test piece
during the entire test to the dust added.
3.10
Dust holding capacity
The total amount of specific test dust filtered out by the test piece, when the test
termination condition is reached.
3.11
Inner cleanliness
The mass of impurities remaining in the air filter cavity before use.
3.12
Recovery ratio of air flow resistance
The ratio -- of the initial resistance of the assembly with a new filter element TO the
resistance after the dust holding capacity test (laboratory life test) is completed, that
is, after the filter element is cleaned, expressed as a percentage (%).
3.13
Shower load
The amount of water added per unit of effective filtration area of the filter element.
3.14
The damage pressure of the filter element shall not be less than 6 kPa.
5.2.10 Air filter/filter element's water immersion resistance
After the air filter with paper filter element is soaked in (23 ± 5) °C pure water for 4
hours, the paper pleats of the filter element shall not be damaged.
5.2.11 Recovery ratio of air flow resistance
After the air filter/filter element's dust capacity test is completed, the recovery ratio of
air flow resistance shall not be less than 80% after performing restorative treatment on
the air filter element.
5.2.12 High and low temperature resistance
After the air filter is subject to the high and low temperature resistance test, no structural
defects such as brittleness and deformation are allowed; the sealing performance of the
assembly shall meet the requirements of 5.2.6.
5.2.13 Water splash resistance of air filter/filter element
After the air filter is subject to the shower test at a shower load of 50 g/m2 per unit
effective filtration area, its filtration efficiency shall meet the requirements of 5.2.2; the
dust holding capacity shall not be less than 90% of the value specified in 5.2.4.
6 Test methods
6.1 Initial resistance test
The initial resistance test is performed in accordance with 6.3 in GB/T 28949-2012.
6.2 Initial filtration efficiency test
6.2.1 In the initial filtration efficiency test, the dust concentration is 1 g/m3, the dust
mass is 20 g.
6.2.2 The initial filtration efficiency test is performed in accordance with 5.1.4 in QC/T
32-2017.
6.3 Test of full life filtration efficiency and dust holding capacity
6.3.1 The dust concentration for the full life filtration efficiency and dust holding
capacity test is 1 g/m3.The test termination condition is that the air filter resistance
reaches the specified value of 3 kPa.
6.3.2 The test methods for full life filtration efficiency and dust holding capacity are
carried out in accordance with 5.1.6 in QC/T 32-2017.
6.4 Inner cleanliness test
The test method for inner cleanliness of wet air filters shall be implemented in
accordance with QC/T 683.The test method for inner cleanliness of dry air filters is
carried out according to 5.1.1 in QC/T 32-2017.
6.5 Sealing test
After the air filter's filtration efficiency test or dust holding capacity test, immediately
disassemble the air filter, to check and record whether there is any dust leakage in the
sealing parts inside the air filter.
6.6 Vibration resistance test
6.6.1 Fix the air filter on the special fixture of the vibration test bench, according to the
installation method when loading; then send the vibration bench to the temperature
control box.
6.6.2 According to the conditions of vibration frequency of 50 Hz, vibration
acceleration of 98 m/s2, temperature of (-20 ± 1) °C, vibrate in the up and down
direction for 1 hour. Then heat up to (80 ± 1) °C. Vibrate in the up and down direction
for 1 hour. After the vibration is completed and the temperature returns to normal,
remove the vibration bench from the high and low temperature box. Conduct a
comprehensive inspection of the outside of the air filter, to see if there are any cracks,
deformations and other structural defects in each component. If there is any defect, stop
and follow each test step according to 6.6.3.
6.6.3 Then, according to the conditions of vibration frequency of 50 Hz, vibration
acceleration of 98 m/s2, temperature of (23 ± 5) °C, vibrate in the front, rear, left and
right directions for 1 hour each. After the vibration is completed, check whether it
complies with the provisions of 5.2.1 and 5.2.8.Disassemble the air filter and
comprehensively inspect each component for cracks, deformation, or other structural
defects.
6.7 Air leakage test
6.7.1 While ensuring that the test pipeline is sealed, securely connect the new air filter
to be tested to the test device as shown in Figure B.1.The air filter inlet and all possible
air inlet locations on the non-clean air side shall be tightly sealed.
6.7.2 Start the vacuum pump, to vacuum at the air outlet. Adjust and stably maintain
the vacuum value on the clean side of the air filter at 5 kPa.
6.7.3 Measure the air leakage on the clean air side at the sealing edges of the filter
element and the upper and lower end covers. Record the measurement results.
6.8 Filter element damage pressure test
and cold tests. The heat and cold cycle sequence is -20 °C/7.5 h → 25° C/0.5 h →
100 °C /15.5 h → 25 °C /0.5 h. The test heating and cooling rate is 3°C /min. The test
is conducted for a total of 4 cycles. After the test, take out the air filter and visually
inspect the appearance changes. Conduct a sealing test according to the provisions of
6.5.
6.12 Water splash resistance performance test of air filter/filter element
6.12.1 Securely connect the new air filter to be tested to the test device as shown in
Figure B.2.
6.12.2 Under the rated air volume flow, start the water spraying system. According to
the effective filtration area of the filter element, determine the water spraying amount,
at a watering load of 50 g/m2.Continuously spray, at a shower concentration of 5 g/m3
and dry compressed air at a pressure of 100 kPa. Stop the test after the water reaches
the specified value.
6.12.3 After shower, the test piece shall be continuously ventilated and dried at the rated
air volume flow, until the pressure drop returns to the initial value or becomes stable.
6.12.4 The dried test piece shall be subjected to performance testing according to the
requirements of 6.2 and 6.3.The filter element status and measurement results shall be
recorded.
7 Inspection rules
7.1 Categories of inspection
The inspection of air filters is divided into two categories. Exit-factory inspection and
type inspection.
7.2 Exit-factory inspection
The exit-factory inspection items are listed in 5.1.
7.3 Type inspection
7.3.1 Products shall undergo type inspection when one of the following circumstances
occurs.
a) Type finalization inspection of trial production of new products or old products
after trans-plant production (the first batch of products manufactured after
identification and type finalization);
b) After formal production, there are changes in structure, materials, processes,
suppliers, etc.;
c) During formal production, periodic inspections shall be carried out regularly or
after accumulating a certain amount of output;
d) When the production is resumed after suspension for more than half a year.
7.3.2 The samples for type inspection shall be selected from the same batch of products
that have passed the exit-factory inspection; the inspection items shall be all items
specified in Chapter 5.
8 Marking, packaging, transportation, storage
8.1 Marking
8.1.1 Each set of products shall be marked with the permanent mark of the manufacturer
(factory name or factory logo); the location of the mark shall not affect product
performance and appearance.
8.1.2 The outer surface of the packaging box shall be marked of the following.
a) Manufacturer’s name, factory logo or trademark;
b) Product name;
c) Product model;
d) Quantity and total mass;
e) Packing box volume dimensions (length × width × height);
f) Storage and transportation pictorial signs such as “Handle with caution” and
“Avoid moisture” shall comply with the provisions of GB 191;
g) Manufacturing date;
h) The number of the implemented standard.
8.2 Packaging, transportation, storage
8.2.1 Each air filter shall be accompanied by a product certificate and product use and
maintenance instructions.
8.2.2 The air filter shall be put into a packaging bag, which is made of waterproof
material; then put into a dry packaging box.
8.2.3 The exit-factory packaging of the air filter shall ensure that it is not damaged
during normal transportation.
8.2.4 The air filter shall be stored in a dry and ventilated warehouse. Under normal
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