【正文】 meet the provisions of JB/T 10214. Balance correction should be conducted for each impeller。d) Coupler (couplerdrive centrifugal fan)。c) Inspection of quality of parts, appearance, assembly, painting, and cleanliness。 flow rate (unit: m3/min)。 the balance quality grade of belt wheel should not exceed Overspeed test results of impeller should meet the provisions of JB/T6445. Pressure deviation (or static pressure deviation) or flow rate deviation or fan impeller efficiency (or static efficiency) of the fan should meet the requirements in clause . The noise of the fan should meet the provisions of JB/T8690. Mechanical running test results, and effective value of bearing temperature, and vibration speed should meet the requirements in clause . Radial clearance between air inlet and wheel disc, and axial overlapping length should meet the provisions in clause . If one of mechanical running test, aerodynamic performance test, impeller overspeed test and noise test of the fan is not passed, samples to be tested should be doubled。g) List of instruments, index dial, piping system and supporting equipment。c) No more than 12mm if the machine No. is more than . There should be sealing device in the outside of centre opening of enclosure if the fan is a highpressure fan.. Others Appearance and cleanliness The inside and outside surface of the cast should be smooth, and free from air bubbles, fissures, and such defects as significantly uneven thickness. The outside surface of the enclosure should be clean, wellproportioned, and smooth. The weld should be smoothed. The inside surface of the enclosure should be painted with antirust coating。 side plate and volute plate of the enclosure may be assembled if the strength is ensured。5%。s Republic of ChinaTable of ContentsPreface III1 Scope 12 Normative References 13 Technical Requirements 1 Drawings and Technical Documents 1 Product Performance 1 Structure 2 Materials for Main Parts 3 Manufacturing 4 Assembling Requirements 4 Others 44 Test Method 55 Inspection Rules 56 Guarantee Period 67 Marks and Packaging 6 Marks 6 Packaging 7Technical Specifications for General Purposes Centrifugal Fans1 ScopeThis standard specifies the technical requirements, test method, inspection rules, guarantee period, marks and packaging of the general purposes centrifugal fans (hereinafter referred to as the Fan).This standard is applicable to ventilation system, airconditioner and centrifugal fan for industrial purpose. The medium it conveys is air or air and other noncorrosive gas mixtures with maximum fan pressure of no more than 30kPa. The inlet temperature of the medium does not exceed 80℃。 specific Aweighted sound level should ply with the provisions of JB/T8690. Mechanical running test should be conducted for fans。 the balance quality grade should meet the provisions of JB/T 9101. Speed of impeller should be 110% of maximum running speed of the fan, and ply with the provisions of JB/T 6445. Impeller is usually coupled with spindle using bolt. The opening and shaft is transitionally fit. The shaft should be longitudinally fastened using fixture which may not loosen in the process of running. The impeller should have sufficient rigidity, and may not transformed in the process of transportation and operation. Molded lines, assembling and processing accuracy of the blade should meet the provisions of JB/T 10214. The surface of impeller that is not processed shall be painted with R03 red paint according to the provisions of GB/T3181 or painted according to the provisions of the contract. Spindle Spindle is usually made from highquality carbon steel or alloy steel, and should have sufficient strength and ri