QC/T 770-2020Dry air cleaner assemblies for automobiles (English PDF)

5.1 Cleanliness of assembly

The air cleaner assembly shall be operated in accordance with the provisions of 5.1.1 in QC/T 32-2017. For the whole process of the initial weighing - disassembling - cleaning - re-assembling and restoration - secondary weighing of the assembly, it shall be finished within 30 min, under the specified laboratory environment.

5.2 Original air intake resistance of assembly

According to the requirements of 5.1.2 of QC/T 32-2017, the test is carried out at the rated air volume flow.

5.3 Original filtration efficiency of assembly

According to the absolute filter method of 5.1.4.1 OR the direct weighing method of 5.1.4.2 in QC/T 32-2017, the test is carried out at the rated air volume flow.

5.4 Pre-filtration efficiency

According to requirement of 5.1.5 in QC/T 32-2017, the test is carried out at the rated air volume flow.

5.5 Laboratory life of assembly

Carry out the laboratory life test of assembly, according to the requirements of 5.1.6 in QC/T 32-2017. Under the rated air volume flow, when the assembly reaches the test termination condition, that is, the air intake resistance reaches 6 kPa, OR the filtration efficiency of the assembly is that, the original filtration efficiency drops by 0.5%, the test ends.

5.6 Whole-life filtration efficiency of assembly

Carry out the test of whole-life filtration efficiency of the assembly, according to the provisions of 5.1.6 in QC/T 32-2017. Under the rated air volume flow, when the assembly reaches the test termination condition, that is, the air intake resistance reaches 6 kPa, OR the filtration efficiency of the assembly is that, the original filtration efficiency drops by 0.5%, the test ends.

5.7 Ash capacity of assembly

For the weather resistance test of the assembly, it may use a new assembly, OR use an assembly, that has been subjected to the air intake resistance/pressure loss test, the original filtration efficiency test, the pre-filtration efficiency test. The actual condition of the assembly shall be indicated in the test report.

5.13 Resistance to low-temperature shock

Place the assembly in a low-temperature chamber, at -30 °C ± 2 °C, for 4 hours.

Take it out. Quickly install it on the test bench. According to the test Ehc: vertical fall hammer, in Chapter 6 of GB/T 2423.55-2006, select the 500 g steel hammer, to carry out the test, by impacting the surface of the sample, at a height of 400 mm from the sample.

5.14 Resistance to free fall impact

The test is carried out in accordance with 5.2 Free fall - method 1 in GB/T 2423.7-2018. For the test severity level, it shall select the fall height and mass, according to the preferred number, which is indicated in boldface in Table 1.

5.15 Corrosion resistance

The assembly is tested according to the neutral salt spray (NSS) test procedure, which is specified in GB/T 10125-2012.

5.16 Seals

The rubber seal of the assembly shall be tested in accordance with the requirements of HG/T 4785.

6.1 Exit-factory inspection

a) Each product can only be exit-factory, after passing the inspection by the quality inspection department AND being accompanied by a product certificate.

b) The inspection items shall meet the requirements of 4.17.

c) When the ordering organization randomly inspects the products, it shall be carried out in accordance with the provisions of GB 2828.1. The sampling scheme and the acceptance quality limit (AQL) shall be determined, through negotiation, between the supplier and the buyer.

6.2 Type inspection

6.2.1 Type inspection shall be carried out in one of the following situations:

a) Identification of type finalization of new products;

b) For normally produced products, when the major changes in structure, materials, processes, may affect performance;

c) For the products that are normally produced, they shall be inspected once every two years;

d) When there is a big difference between the result of the exit-factory inspection and the result of the last type inspection;

e) When the national quality supervision agency puts forward a requirement for type inspection.

6.2.2 The items for type inspection are all the items specified in Chapter 4. The test of resistance to vibration fatigue of assembly is an optional test item.

6.2.3 The sampling scheme is determined, through negotiation, between the supplier and the buyer. However, it cannot be less than 3 pieces.