QC/T 780-2024 in English
VALIDMotorcycles Radiator
- Issued on:-
- Implemented on:-
- File Format:PDF
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| Standard No: | QC/T 780-2024 |
| Document status: | VALID |
| Title in English: | Motorcycles Radiator |
| Title in Chinese: | 摩托车散热器 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 1~3 business days |
| Superseding: |
QC/T 780-2007 Water radiator used in motorcycles
|
| Professional Classification: | QC-Automobile |
| Related Topics: | electronic radiator
|
本文件规定了摩托车散热器的要求和试验方法本文件适用于采用水冷汽油发动机的摩托车和轻便摩托车用散热器
Introduction
Core changes in the standard revision
| Technical indicators | Requirements of the 2007 version | Requirements of the 2024 version | Range of change |
|---|---|---|---|
| Low temperature resistance | Not specified | -40℃±2℃ maintained for 10h | New clauses |
| Sealing test | Wet detection priority | Dry detection method is mainly used | Method change |
| Residue limit | 20mg | 15mg | Strictly 25% |
Analysis of key performance requirements
4.3.1 Sealing requirements
The new standard clarifies the welding repair process specifications: The heat sink must not be burned during the welding process, and the collapsed heat sink must meet the requirement of ≤1% of the collapsed area in Clause 4.2.2 after repair.
4.3.5 Low temperature resistance test
Newly added -40℃ extreme cold environment test:
- Use antifreeze with freezing point ≤-45℃
- Low temperature holding time 10h±10min
- Detection is based on QC/T468 wet leak detection method
Test method innovation
Wind duct test device specification
Appendix B specifies the key parameters of the test device: Transition section angle:Diffusion angle θ≤8°, convergence angle δ≤15°
Wind speed control:Adjustable range of 25-30m/s
Water temperature fluctuation:Precise control of ±0.2℃
Structural parameter calculation model
Appendix A of the standard provides four core calculation formulas:
- Heat dissipation Q=0.1~0.16×fuel thermal energy
- Air flow rate V=Q/(Δt·ρ·C)
- Positive area A=V/Vp
- Coolant circulation volume Vw=Q/(Δtw·ρw·Cw)
Implementation suggestions
Manufacturers need to pay attention to:
- Establish a -40℃ low temperature test room
- Upgrade dry leak detection equipment
- Optimize welding process to prevent damage to heat sink
- Use turbine flowmeter and other instruments specified in Clause B.2
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