Fan equipment quality appraisal

fan equipment uses the core principle of impeller rotation to drive the directional flow of fluid media. Through aerodynamic design and intelligent control technology, it realizes ventilation, heat dissipation, material transportation and other functions. It is widely used in industrial manufacturing, construction engineering, environmental protection and other fields. In the metallurgical industry, it is responsible for blast furnace blast; in the construction field, it is used in underground garage smoke exhaust systems; in environmental protection projects, it is used as the core equipment for VOCs waste gas treatment. Compared with traditional ventilation equipment, modern fans have the characteristics of high efficiency, energy saving, low noise, and intelligent speed regulation. They are important infrastructure in the industrial and civil fields.

Zhongke Testing is a product quality appraisal service organization registered with the court. It can provide quality appraisal services for wind turbine equipment. It has a professional appraisal team and advanced instruments and equipment to provide fair and accurate appraisal results for wind turbine equipment quality appraisal.

As the application scenarios of wind turbines become more complex, quality dispute cases are gradually increasing. The focus of judicial disputes is:

1. Disputes over performance indicators: whether the actual air volume meets the standard and whether the full pressure efficiency meets the design value;

2. Material defects: insufficient corrosion resistance of the impeller material, insufficient corrosion resistance of the shaft, The bearing life is not up to standard;

3. Process problems: Insufficient dynamic balance level of the blades and defects in the welding process lead to structural cracks;

4. Contract performance issues: The delivered equipment does not comply with the technical agreement.

Fan equipment quality appraisal technical methods mainly include:

1. Appearance inspection: Inspect the appearance, surface defects, installation accuracy, etc. of the fan equipment.

2. Performance testing: Test the power, efficiency, noise, vibration and other performance indicators of the fan equipment, and compare them with the indicators specified in the contract or standards.

3. Material analysis: Analyze the materials of key components such as blades, gears, and bearings of wind turbine equipment, and check their mechanical properties, chemical composition, etc.

4. Failure analysis: Analyze the cause of fan equipment failure and determine whether it is a design defect, manufacturing defect or improper use.

A chemical company of the applicant signed an "Explosion-proof Axial Flow Fan Procurement Contract" with a fan company of the respondent, agreeing to purchase 10 fans of model BZF-1000 for workshop ventilation. After being put into production, the vibration of the fan exceeded 2.8mm/s, and the impeller weld cracked, causing production to stop. The chemical company believed that the equipment had quality defects and demanded compensation for losses. The wind turbine company argued that the problem was caused by improper installation, and both parties took the matter to court.

Identification analysis results:

The quality analysis expert group discussed and comprehensively analyzed the relevant information of "fan equipment", contract technical agreements, on-site investigation case materials and other data, and made the following quality analysis opinions:

The impeller material of the involved fan equipment is 304 stainless steel (316L required by the contract), and the Cr content is only 18%, insufficient corrosion resistance;

bearing material is ordinary carbon steel (contract requires GCr15 bearing steel), with a hardness of only HRC40 (standard ≥HRC60). The dynamic balance grade of the blade is only G6.3 (standard G2.5), with a residual imbalance of 15g·cm; the unfused depth of the weld reaches 2mm (standard ≤1mm), and the surface porosity exceeds 3%.

The fan equipment quality appraisal report should include the following content:

1. The purpose and basis of the appraisal.

2. Model, specification, manufacturer and other information of the equipment being identified.

3. Identification method.

4. Identification results (including whether there are quality problems, causes of problems, etc.).