QC/T 1122-2019Technical specifications of electric water pump for vehicle engine (English PDF)

3.1 Rated condition of electric water pump

The operating conditions of the electric water pump, under the voltage, rated flow, head conditions, which are specified in the technical documents.

4.1 General technical requirements

4.1.1 Electric water pumps shall comply with the provisions of this standard. It shall be manufactured according to the drawings and technical documents, which are approved by the prescribed procedures.

4.1.2 The surface of the electric water pump shall have no defects, obvious color difference, deformation, cracks; the sealing surface shall have no scratches; the chamfers of the sealing ring groove shall be smooth AND shall be free from flash.

4.1.3 The starting and normal operating voltage range of the electric water pump is 12 V ± 4 V.

4.1.4 The recommended operating temperature range of the electric water pump is -40 °C ~ 125 °C, OR meet the requirements of relevant technical conditions.

4.5.6 Reverse voltage

Carry out the test according to 5.5.6. The reverse voltage performance of the electric water pump shall at least reach the level C, which is defined in GB/T 28046.1-2011.

4.6 Environmental adaptability

4.6.1 Temperature gradient

Carry out the test according to 5.6.1. The temperature gradient performance of the electric water pump shall reach the level A, which is defined in GB/T 28046.1-2011.

4.6.2 Cold water shock

Conduct the test according to 5.6.2. The cold water shock performance of the electric water pump shall reach the level A, which is defined in GB/T 28046.1-2011. In addition:

a) After the test, it shall meet the sealing performance requirements in 4.4;

b) Visual inspection after the test, there shall be no visible deformation and cracks;

c) After the test, there shall be no sticking when turning the rotor of the electric water pump.

4.6.3 Damp heat cycle

Carry out the test according to 5.6.3. The damp heat cycle performance of the electric water pump shall reach the level A, which is defined in GB/T 28046.1-2011.

4.7 Electromagnetic compatibility

4.7.1 Electromagnetic immunity

Carry out the test according to 5.7.1. The test results shall meet the requirements of relevant technical documents.

4.7.2 Electromagnetic disturbance

Carry out the test according to 5.7.2. The test result shall meet the requirements of relevant technical documents.

4.8 Reliability and durability

4.8.1 General durability

Carry out the test according to 5.8.1. The test time shall be at least 2000 h. The electric water pump shall meet the following requirements:

a) The performance before and after the test shall meet the requirements of 4.2. During the test and re-inspection after the test, the performance difference from that before the test shall not exceed 5%; the sealing performance shall meet the requirements of 4.4;

b) Check the appearance after the test; there shall be no deformation, crack, leakage;

c) After the performance re-inspection, disassemble and measure the wear of the electric water pump's impeller, shaft, retaining ring; each wear shall meet the requirements of the technical documents.

4.8.2 Start-stop durability

The test shall be carried out according to 5.8.2. The electric water pump shall meet the following requirements:

a) Perform performance re-inspection after the test, which shall meet the requirements of 4.2;

b) It can be started normally during and after the test. The variation of the start-up time shall not exceed the requirements of the technical documents.

4.8.3 Corrosion resistance

Carry out the test according to 5.8.3. After the test, the electric water pump shall meet the following requirements:

a) The performance and tightness re-inspection shall meet the requirements of 4.2 and 4.4;

b) The structure in contact with the cooling liquid shall have no wear and corrosion beyond the relevant technical requirements.

4.8.4 Thermal shock

Carry out the test according to 5.8.4. After the test, the electric water pump shall meet the following requirements:

a) Carry out performance and tightness re-inspection, which shall meet the requirements of 4.2 and 4.4;

b) During visual inspection, it shall show no damage, visible deformation, or cracks.

4.8.5 Waterproof and dustproof

Waterproof and dustproof shall meet the requirements of IP 6K 9K. It implements the relevant requirements of GB/T 30038.

4.8.11 Salt spray test

Carry out the test according to 5.8.10. The electric water pump shall meet the following requirements:

a) The performance and tightness re-inspection after the test shall meet the requirements of 4.2 and 4.4;

b) The functional condition reaches the level A, which is defined in GB/T 28046.1-2011;

c) During visual inspection, the corrosion condition of each component and marking shall not exceed the requirements of relevant technical documents.

4.8.12 High temperature working durability

Carry out the test according to 5.8.11. The electric water pump shall meet the following requirements:

a) The performance and tightness re-inspection after the test shall meet the requirements of 4.2 and 4.4;

b) During and after the test, there shall be no abnormalities in starting and running;

c) During visual inspection, the pump body and impeller shall be free from leakage, visible cracks, deformation;

d) Disassemble and measure the wear of the electric water pump's impeller, shaft, retaining ring; each wear shall meet the requirements of relevant technical documents.

4.8.13 Low temperature working durability

Carry out the test according to 5.8.12. The electric water pump shall meet the following requirements:

a) The performance and tightness re-inspection after the test shall meet the requirements of 4.2 and 4.4;

b) During and after the test, there shall be no abnormalities in starting and running;

c) During visual inspection, the pump body and impeller shall be free from leakage, visible cracks, deformation;

d) Disassemble and measure the wear of the electric water pump's impeller, shaft, retaining ring; each wear shall meet the requirements of relevant technical documents.

4.8.14 Idling test

Carry out the test according to 5.8.13. The electric water pump shall meet the following requirements:

a) Perform performance re-inspection after the test; the performance shall meet the requirements of 4.2;

b) During the test, there is no stagnation, sharp and piercing sound, or damage;

c) Disassemble and measure the wear of the electric water pump's impeller, shaft, retaining ring. The wear shall meet the requirements of relevant technical documents.

4.8.15 Vibration durability

Carry out the test according to 5.8.14. The electric water pump shall meet the following requirements:

a) The performance and tightness re-inspection after the test shall meet the requirements of 4.2 and 4.4;

b) During and after the test, there shall be no abnormal start-up and operation failure;

c) During visual inspection, there shall be no leakage, visible deformation, or cracks;

d) There shall be no loosening of fasteners and solder joints.

5.1 Test conditions

5.1.1 Environmental conditions

Unless otherwise specified, the test shall be carried out in an environment, of which the temperature is 23 °C ± 5 °C, relative humidity is 25% ~ 85%, and atmospheric pressure is 86 ~ 106 kPa.

5.1.2 Test device

Unless otherwise specified, the closed test bench shall be assembled, according to the provisions in 6.4 of JB/T 8126.2-2010; the steam pressure inside the closed water tank shall be consistent with the water tank pressure of the automobile engine cooling system.

5.5.2 Overvoltage test method

The test shall be carried out under the rated operating conditions of the electric water pump, according to the provisions in 4.3.1.1.2 of GB/T 28046.2-2011.

5.5.3 Superimposed alternating voltage test method

The test shall be carried out under the rated operating conditions of the electric water pump, according to the provisions in 4.4.2 of GB/T 28046.2-2011.

5.5.4 Test method for ramp down and up of supply voltage

The test shall be carried out under the rated operating conditions of the electric water pump, according to the provisions in 4.5.2 of GB/T 28046.2-2011.

5.5.5 Test method for transient change of supply voltage

The test shall be carried out under the rated operating conditions of the electric water pump, according to the provisions in 4.6.1.2 of GB/T 28046.2-2011.

5.5.6 Reverse voltage test method

The test shall be carried out under the rated operating conditions of the electric water pump, according to the provisions in 4.7.2 of GB/T 28046.2-2011.

5.6 Environmental adaptability test method

5.6.1 Temperature gradient test method

The test shall be carried out under the rated operating conditions of the electric water pump, according to the provisions in 5.2.2 of GB/T 28046.4-2011. Among them, Tmax and Tmin are the upper and lower limits of the ambient temperature, which is specified in 4.1.4 of this document.

5.6.2 Cold water shock test method

The test shall be carried out under the rated working conditions of the electric water pump, according to the provisions in 5.4.2 of GB/T 28046.4-2011.

5.6.3 Damp heat cycle test method

The test shall be carried out under the rated working conditions of the electric water pump, according to the provisions in 5.6.2 of GB/T 28046.4-2011.

5.7 Electromagnetic compatibility test method

5.7.1 Electromagnetic immunity test method

The electromagnetic radiation immunity test shall be carried out according to the large current injection method and the free field method, respectively. The frequency range of the high current injection method is 1 MHz ~ 400 MHz; the frequency range of the free field method is 200 MHz ~ 2.5 GHz and 2.7 GHz ~ 3.2 GHz.

The large current injection method test shall be carried out, according to GB/T 17619; the injection current shall be carried out, according to the requirements of the technical documents;

The free field method test shall be carried out, according to GB/T 17619; the field strength shall be carried out, according to the requirements of the technical documents;

The anti-interference test of electrical transient conduction shall be carried out, according to GB/T 21437.2 and GB/T 21437.3. The pulse type and severity shall be carried out, in accordance with the relevant provisions in the standard or the requirements of relevant technical documents;

The electrostatic discharge performance test shall be carried out, according to GB/T 19951. The test requirements include: powered state contact discharge ±2 kV and ±4 kV, air discharge ±8 kV; powered state contact discharge ±2 kV, ±4 kV, ±8 kV, air discharge ±4 kV, ±8 kV, ±15 kV.

5.7.2 Electromagnetic disturbance test method

It shall be tested, under the rated working conditions of the electric water pump, according to the measurement method of parts and modules in GB/T 18655-2018.

5.8 Reliability and durability test methods

5.8.1 General durability test method

The general durability test shall be carried out, using the test device specified in 5.1.2; the azimuth angle of the electric water pump shall be the same as that of the engine.

Coolant is used as the test medium; the temperature of the medium is controlled at 90 °C ± 2 °C; the ambient temperature is not controlled.

The performance of the sample before the test shall meet the index requirements. The test shall be carried out under the rated working condition of the electric water pump.

5.8.2 Start-stop durability test method

The start-stop test is carried out, under rated working conditions; the medium is coolant; the temperature of the coolant is controlled at 90 °C ± 2 °C. The test cycle process is as shown in Figure 1, including T1, T2, T3. The T1 stage is the start-up stage; the T2 stage is 2 s, the electric water pump is maintained at the rated working condition in this stage; the T3 stage is 3 s, this stage is the stalling stage. A total of 345000 cycles are performed in the test.

5.8.11 High temperature working durability test method

Install the electric water pump on the system, as shown in Figure 3, for the test. The electric water pump is placed in a high-temperature environment chamber, which has a constant temperature of 125 °C. The medium is coolant. The temperature is 90 °C ± 2 °C. The test is carried out for 500 h, under the rated working condition of the electric water pump.

5.8.12 Low temperature working durability test method

Install the electric water pump on the system, as shown in Figure 3, for the test. The electric water pump is placed in a low-temperature environment chamber, which has a constant temperature of -40 °C. The test medium meets the requirements of relevant documents. The test is carried out for 500 h, under the rated working condition of the electric water pump.

5.8.13 Idling test method

The electric water pump is subjected to an idling test, at a rated voltage of 12 V; the test time is 24 hours.

5.8.14 Vibration durability test method

5.8.14.1 Vibration test requirements

The electric water pump is connected according to the system as shown in Figure 3. The electric water pump is fixed on the vibration test bench, according to the requirements of relevant technical documents. The test is carried out under the rated working condition of the electric water pump. The test medium is coolant.

The hose -- between the electric water pump and the water tank -- shall be long enough, to reduce the pulling force, which is caused by vibration.

The vibration durability test items include vibration durability at a fixed frequency and frequency-sweeping vibration durability. Different pumps are used for the test.

5.8.14.2 Fixed-frequency vibration durability test method

Sweep frequency vibration in three directions of X, Y, Z respectively, for the electric water pump. The frequency sweep acceleration is 1 g. Determine the frequency, corresponding to the maximum vibration acceleration of the electric water pump, within the frequency range of 10 Hz ~ 200 Hz. Then vibrate 10^7 times at this frequency, at an acceleration of 20 g.

5.8.14.3 Frequency sweep vibration durability test method

Sweep frequency vibration in three directions of X, Y, Z respectively, for the electric water pump. The relationship between the acceleration and frequency of the vibration cycle can be as shown in Figure 5, to vibrate for 8 hours in each direction.