QC/T 661-2019 English PDF (QCT661-2019)

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QC/T 661-2019: Vehicle air conditioner accumulator
QC/T 661-2019
QC
AUTOMOBILE INDUSTRY STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
ICS 43.040.60
T 26
Replacing QC/T 661-2000
Vehicle air conditioner accumulator
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 ... 9
2 Normative references ... 9
3 Terms and definitions ... 9
4 Technical requirements ... 10
5 Test methods ... 13
6 Inspection rules ... 18
7 Marking, packaging, transportation, storage ... 19
Vehicle air conditioner accumulator
1 Scope
This standard specifies the technical requirements, test methods, inspection rules,
marking, packaging, transportation, storage of accumulators (hereinafter referred to as
accumulators) for automobile air conditioning systems.
This standard is applicable to accumulators for automobile air conditioners using HFC-
134a and HFO-1234yf as refrigerants. Those using other types of refrigerants may refer
to it.
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 191 Packaging - Pictorial marking for handling of goods
GB/T 6287 Determination of static adsorbed water for molecular sieve
ISO 12103-1 Road vehicle - Test dust for filter evaluation - Part 1: Arizona test dust
ASTM G85 A3 Acidified synthetic sea water testing (SWAAT Test)
3 Terms and definitions
The following terms and definitions apply to this standard.
3.1
Accumulator
The accumulator is a device that separates refrigerant liquid and gas, ensures the
outflow of refrigerant gas, has a refrigerator oil return flow compressor, filters the
residual impurities of the refrigerant, adsorbs the residual moisture in the
refrigeration system, stores the refrigerant.
3.2
Accumulators shall comply with the provisions of this standard and be manufactured
according to drawings and technical documents, which are approved through prescribed
procedures. This standard uses absolute pressure, in the unit of MPa or kPa.
4.2 Air tightness
After testing in accordance with 5.2, the total leakage rate of the refrigerant of the
accumulator shall not be greater than 2 g/y, under the condition of 2.0 MPa detection
pressure.
4.3 Pressure rupture resistance
After testing in accordance with 5.3, there shall be no leakage and obvious deformation
under a pressure of 2.5 MPa; there shall be no rupture under a pressure of 3.5 MPa.
4.4 Vacuum resistance
After testing in accordance with 5.4, the pressure rise shall not exceed 0.5 kPa in 30
minutes.
4.5 Internal cleanliness
After testing in accordance with 5.5, the internal impurity content shall not be greater
than 2.7 mg/dm2 (internal surface area); the size of solid particle impurities shall not be
greater than 0.5 mm × 0.5 mm × 1.0 mm; the length of fiber impurities shall not be
greater than 1.0 mm.
4.6 Drying performance
4.6.1 After testing according to 5.6.1, the water absorption capacity of the desiccant
shall not be less than 15%.
4.6.2 After testing according to 5.6.2, the residual moisture of the desiccant shall not be
greater than 2.0%.
4.7 Pressure loss
After testing in accordance with 5.7, the pressure difference between the inlet and outlet
shall not be greater than 15 kPa.
4.8 Effective capacity
After calculation according to 5.8, the calculated value shall not be less than the value
specified in the drawing.
4.9 Oil return capability
After testing according to 5.9, the mass of the compressor refrigeration oil remaining
in the accumulator shall comply with the agreement between the supplier and the buyer.
4.10 Filtering capability
After testing according to 5.10, the size of impurity particles shall not be less than 200
μm.
4.11 Liquid-gas separation capability
After testing according to 5.11, the vapor content of the outlet refrigerant shall not be
less than 85%.
4.12 High temperature resistance
After testing in accordance with 5.12, the appearance shall be free of abnormal
deformation or damage; the air tightness shall meet the requirements of 4.1; the internal
parts shall be free of damage.
4.13 Low temperature resistance
After testing in accordance with 5.13, the appearance shall be free of abnormal
deformation or damage; the air tightness shall meet the requirements of 4.1; the internal
parts shall be free of damage.
4.14 Resistance to temperature alternation
After testing in accordance with 5.14, the appearance shall be free of abnormal
deformation or damage; the air tightness shall meet the requirements of 4.1; the internal
parts shall be free of damage.
4.15 Vibration resistance
After testing in accordance with 5.15.1 and 5.15.2, the appearance shall be free of
abnormal deformation or damage; the air tightness shall meet the requirements of 4.1;
the internal parts shall be free of damage.
4.16 Resistance to pressure alternation
After testing in accordance with 5.16, the appearance shall be free of abnormal
deformation or damage; the air tightness shall meet the requirements of 4.1; the internal
parts shall be free of damage.
4.17 Corrosion resistance
After testing in accordance with 5.17, the air tightness and pressure resistance shall
meet the requirements of 4.1 and 4.2.
5 Test methods
5.1 Requirements for measuring instruments
5.1.1 The accuracy of the temperature measuring instrument shall not be less than
±0.2 °C.
5.1.2 The accuracy of the pressure measuring instrument shall not be less than ±1% of
the absolute pressure reading.
5.1.3 The accuracy of the flow measuring instrument shall not be less than ±2% of the
measured value.
5.1.4 The precision of the analytical balance shall not be less than 0.1 mg.
5.1.5 The precision of filter paper is not less than 5 μm.
5.1.6 The precision of the leak detector shall not be less than 1.0 × 10-8 Pa·m3/s.
5.2 Air tightness test
Fill the accumulator with 2.0 MPa dry helium gas, at a purity of not less than 75%. Use
a helium leak detector to make detection. The pressure holding time is not less than 15
seconds. The total leakage rate of refrigerant equivalent shall not be greater than 1.5 ×
106 Pa·m3/s.
5.3 Pressure rupture test
Under protective conditions, the accumulator is filled with liquid medium, at a
temperature of 23 °C ± 5 °C; the pressure increase rate is not greater than 0.1 MPa/s;
the pressure is increased to 2.5 MPa; the pressure is held for 5 minutes. After inspection,
if there is no leakage or obvious deformation, continue to increase the pressure to 3.5
MPa; hold the pressure for 3 min, it shall not rupture. Then increase the pressure until
the product ruptures. Record the pressure value when the rupture begins.
5.4 Vacuum resistance test
Close one end of the inlet and outlet of the accumulator. Vacuum the other end. The
internal pressure drops below 0.5 kPa. Stop vacuuming, after the exhaust pipeline in
front of the vacuum pump is closed. The pressure rise change is not greater than 0.5
kPa in 30 minutes.
5.5 Internal cleanliness test
Weigh the filter paper, after placing it at a temperature of 90 °C ± 5 °C for no less than
30 minutes (mA). Pour analytical grade isooctane or ethanol solvent, that is about 30% ...