QC/T 708-2019 English PDF (QCT708-2019)

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QC/T 708-2019: Vehicle air conditioning fan
QC/T 708-2019
QC
AUTOMOTIVE INDUSTRY STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
ICS 43.040.10
T 36
Replacing QC/T 708-2004, QC/T 29092-1992
Vehicle air conditioning fan
ISSUED ON: NOVEMBER 11, 2019
IMPLEMENTED ON: APRIL 01, 2020
Issued by: Ministry of Industry and Information Technology of PRC
Table of Contents
Foreword ... 7
1 Scope ... 10
2 Normative references ... 10
3 Terms and definitions ... 11
4 Requirements ... 12
5 Test methods ... 18
6 Inspection rules ... 25
7 Marking, packaging, storage, custody ... 28
Vehicle air conditioning fan
1 Scope
This standard specifies the terms and definitions, requirements, test methods,
inspection rules, marking, packaging, storage, custody of vehicle air-
conditioning fans (including evaporator blowers, condenser fans, air heater
blowers).
This standard applies to vehicle air-conditioning fans (including evaporator
blowers, condenser fans, air heater blowers), hereinafter referred to as fans.
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) is applicable to this standard.
GB/T 1236 Industrial fan - Performance testing using standardized airways
GB/T 2423.17-2008 Environmental testing for electric and electronic
products - Part 2: Test method - Test Ka: Salt mist
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 18655-2018 Vehicles, boats and internal combustion engines - Radio
disturbance characteristics - Limits and methods of measurement for the
protection of on-board receivers
GB/T 19951-2019 Road vehicles - Disturbances test methods for
electrical/electronic component from electrostatic discharge
GB/T 21437.2-2008 Road vehicles - Electrical disturbances from conduction
and coupling - Part 2: Electrical transient conduction along supply lines only
GB/T 28046.1 Road vehicles - Environmental conditions and testing for
electrical and electronic equipment - Part 1: General
GB/T 28046.3-2011 Road vehicles - Environmental conditions and testing
for electrical and electronic equipment - Part 3: Mechanical loads
GB/T 28046.4-2011 Road vehicles - Environmental conditions and testing
for electrical and electronic equipment - Part 4: Climatic loads
GB/T 28046.2-2019 Road vehicles - Environmental conditions and testing
for electrical and electronic equipment - Part 2: Electrical loads
GB/T 30038-2013 Road vehicles - Degrees of protection (IP-code) -
Protection of electrical equipment against foreign objects, water and access
GB/T 33014.2-2016 Road vehicles - Component test methods for
electrical/electronic disturbances from narrowband radiated electromagnetic
energy - Part 2: Absorb-lined shielded enclosure
GB/T 33014.4-2016 Road vehicles - Component test methods for
electrical/electronic disturbances from narrowband radiated electromagnetic
energy - Part 4: Bulk current injection (BCI)
QC/T 413-2002 Basic technical requirements for automotive electric
equipment
QC/T 29106-2014 Technical specification of automobile wire harness
3 Terms and definitions
The terms and definitions in GB/T 28046.1, as well as the following terms and
definitions, apply to this document.
3.1
Compressor blower and fan
An air drive assembly, which consists of an electric motor, a fan blade or
rotor, a casing, etc.
3.2
Evaporator blower
A fan, that delivers air volume to the cabin, in an automotive air conditioner.
3.3
Condenser fan
A fan, which is used to remove energy from the condenser, in an automotive
air conditioner.
3.4
run, to carry out the temperature rise test. After the temperature rise of the motor
is stable, the temperature rise of the motor casing shall not exceed 55K.
4.6 Vibration resistance
During the vibration test of the fan, there shall be no damage to the parts. After
the test, the performance of the fan shall not change by more than 15%, as
specified in 4.2; the noise value is allowed to increase by up to 3dB (A).
4.7 Connection strength of condenser fan blade
The motor and the fan blade of the condenser fan shall be able to withstand the
connection strength test of 8 times the rated torque; there shall be no visible
deformation, after the test.
4.8 Strength of wire harness and terminal connection
The wiring harness and terminal of the fan connector shall be firmly connected;
the minimum tensile force shall comply with the provisions of 4.4.6 in QC/T
29106-2014.
4.9 Stall resistance
4.9.1 Stall resistance of brushed motor
The brushed fan shall meet the requirements of the stall test, when energized
with the test voltage UA for 30s and 30min, respectively. After the power-on test
for 30s, the fan is not allowed to be damaged; its basic performance shall
comply with the provisions of 4.2.1; during the power-on test for 30min, smoke
is allowed, BUT open fire is not allowed.
4.9.2 Stall resistance of brushless motor
The brushless fan shall meet the locked-rotor test, when the test voltage UA is
applied for 30 minutes. After the test, the fan is not allowed to be damaged; the
basic performance shall meet the requirements of 4.2.1.
4.10 Overvoltage resistance
The fan shall meet the requirements of 4.2.1 after the voltage test.
4.11 Resistance to superimposed AC voltage
The fan shall meet the requirements of 4.2.1, after the superimposed AC
voltage test.
4.12 Resistance to power supply voltage ramp down and ramp up
The fan shall meet the requirements of 4.2.1, after subject to the power supply
voltage ramp down and ramp up test.
4.13 Resistance to power supply voltage transient change
The fan shall meet the requirements of 4.2.1, after subject to the power supply
voltage transient change test.
4.14 Resistance to reverse voltage
The fan shall meet the requirements of 4.2.1, after the reverse voltage test.
4.15 Open circuit performance (for brushless fans)
The fan shall meet the requirements of 4.2.1, after the open-circuit test.
4.16 Short-circuit protection (for brushless fans)
After the short-circuit protection test, the fan shall meet the requirements of
4.2.1.
4.17 Withstanding voltage performance
The fan armature shall withstand a sinusoidal voltage of 500V (effective value,
50Hz ~ 60Hz), for a duration of 60s. There shall be no breakdown and flashover
during the test; the leakage current shall not exceed 5mA. In the case of
continuous production in large quantities, it can be replaced by a test of sine
voltage of 660V (effective value, 50Hz ~ 60Hz), which lasts for 1s.
4.18 Insulation resistance
The resistance of the fan armature, through the insulation resistance test, shall
not be less than 10MΩ.
4.19 Salt spray resistance
The salt spray resistance of the fans shall be carried out in a non-working state.
The continuous test duration of the evaporator blower and the air heater blower
is 48h; the continuous test duration of the condenser fan is 96h. After the test,
the corrosion rate on the sprayed surface shall not be higher than 20%; rust
and air bubbles shall be allowed within 2mm from the edge and weld; the
performance shall meet the requirements of 4.2.1.
4.20 Low-temperature storage performance