GB 26410-2011Explosion-proof fan (English PDF)

3.1 Fan performance

3.1.1 at rated speed and within a predetermined flow rate range, the measured deviation fan aerodynamic performance and aerodynamic performance should meet the provisions of the following Provisions.

a) at a predetermined flow rate, machine number less than or equal to .10 fan pressure value does not exceed 8% to 5% of the value; gauge .10 fan pressure is greater than the value does not exceed -5% to 5% of the value.

b) Fan efficiency of not less than 8% of the corresponding point of efficiency.

3.1.2 Fan noise sound level than A LSA best efficiency operating point values should be consistent with the provisions of JB/T 8690's.

3.1.3 Fan bearing temperature and vibration velocity support shall meet the following requirements.

a) in the bearing surface of the measured bearing temperature not higher than the ambient temperature 40 °C.

b) rigid support RMS vibration velocity shall not exceed 4.6mm/s, flexible support RMS vibration velocity shall not exceed 7.1mm/s.

3.2.1 Basic design requirements

3.2.1.1 under specified operating conditions, fans and auxiliary equipment according to last at least 10a (except wearing parts), the first overhaul Safe operation shall be not less than 18000h time before the design.

3.2.1.2 Fan rigid shaft critical speed should be not less than

1.3 times the maximum operating speed.

3.2.1.3 Basic fan type, size parameters and characteristics should be consistent with the provisions of GB/T 3235's.

3.2.1.4 Fan in the structure, adjacent to the requirements of the rotating member and the stationary member to avoid grazing, to prevent sparks. Other aspects such as structure Type, strength, stiffness, etc. should be met. axial fan should be consistent with the relevant provisions of JB/T 10562, the centrifugal fan should be consistent with JB/T 10563 The relevant provisions of other fans shall comply with the relevant standards.

3.2.2 Impeller

3.2.2.1 Impeller shall be subject to the test speed, impeller operate at a maximum operating speed of not less than 110% of the speed, duration is not Less than 2min, and in accordance with the provisions of JB/T 6445's.

3.2.2.2 impeller balance should be corrected, balanced quality rating shall comply with the provisions of JB/T 9101's.

3.2.2.3 impeller rivet rivet through-hole diameter according to Table 1, the riveting quality requirements should be consistent with the provisions of JB/T 10214 of. Table 1 rivet through-hole diameter in millimeters Rivet diameter d 2 2.5 3 3.5 4 5 6 8 10

3.3 Main parts and materials

3.3.1 Impeller aluminum alloy material, the inlet chamber, the housing is necessary to use carbon steel.

3.3.2 Fan impeller with steel material, the centrifugal fan inlet chamber port ring and rivets material must be made of brass or aluminum; Axial Fan The corresponding part of the inner steel impeller enclosure must be made of brass or aluminum ring and the corresponding rivet.

3.3.3 Other materials should be used in rotating and stationary parts grazing non-sparking materials, technical requirements should be consistent with JB/T 10562 And JB/T 10563 requirements.

3.4.1 Casting Requirements

3.4.1.1 quality iron castings shall comply with JB/T 6887's.

3.4.1.2 quality steel castings shall comply with JB/T 6888's.

3.4.1.3 quality aluminum alloy castings shall comply with GB/T 9438's.

3.4.2 Maohan requirements

3.4.2.1 welding quality should be consistent with the provisions of JB/T 10213 of.

3.4.2.2 Maohan manufacturing shall comply with JB/T 10214 of.

3.4.2.3 Other welding requirements should be consistent with JB T 10562 and JB/T 10563 requirements /.

3.5 assembly requirements

3.5.1 centrifugal fan inlet chamber and impeller inlet port ring circumferential radial clearance should be uniform, machine number less than or equal to .10 ventilator Unilateral radial clearance is 2.5mm ~ 4mm, machine number is greater than the radial ventilator .10 unilateral clearance (0.15% ~ 0.4%) D the impeller diameter, But not less than the minimum radial clearance unilateral 2.5mm, an axial length of the overlap (0.8% ~ 1.2%) D of the impeller diameter.

3.5.2 radial clearance axial fan casing and impeller should be uniform, machine number less than or equal to one-sided radial fan for clearance .10 2.5mm ~ 4mm, machine number is greater than the radial ventilator .10 unilateral clearance (0.15% ~ 0.35%) D of the impeller diameter, but the minimum radial unilateral Clearance of not less than 2.5mm.

3.6 Safety Requirements Flameproof motors, and electric fan equipped with Annex

3.6.1 should be consistent with GB 3836.1, GB 3836.2, GB 3836.3 and JB/T 7565.5 Provisions. Where appropriate

3.6.2 Fan cabinet surface and the surface of the drive assembly should be grounded device complies with the requirements of explosion-proof and has a permanent ground Mark.

3.6.3 Fan inlet chamber open direct air intake chamber must be installed to protect the fixed grid (or network) to prevent foreign body aspiration Ventilator Inside. The cause of protecting grid (net) in addition to the structural design of the machine number considering the size of the fan, the working environment and other factors should be considered unprotected grid (net) The minimum airflow resistance.

3.6.4 transmission group, couplings, pulleys, belts and other rotating (driving) member shall have a safety device cover, and in accordance with the provisions of GB/T 19074, and Shield structure should be strong and avoid contact with the rotating member. To avoid the accumulation of electrostatic sparks the shroud, and the chassis insulation shield should be set Reliable grounding device.

3.6.5 Fan rotating parts must be firmly fixed, there should be measures to prevent loosening (impeller and shaft lock; bearing housings, bearing housings and motors Measures and positioning bracket).

3.6.6 When the fan impeller shaft through the housing, through parts of the shaft hole steel housing and shaft should be installed with aluminum spigot sealing septum From the ring; unilateral gap is sealed from the bore and the shaft with is 0.5mm.

3.7 Other

3.7.1 Fan coating shall comply with JB/T 6886's.

3.7.2 Fan appearance and cleanliness should meet the JB T 10562 and JB/T 10563 requirements /. Test Method 4

4.1 impeller (or rotor) and pulley balance correction shall comply with the provisions of JB/T 9101's.

4.2 Impeller test shall comply with JB/T 6445's.

4.3 mechanical operation test. acceleration from zero speed to a predetermined speed, and at least in stable bearing temperature measured after 20min bearing temperature and vibration Move, its bearing temperature and vibration should be consistent with the provisions of 3.1.3.

4.4 aerodynamic performance tests shall comply with GB/T 1236's.

4.5 noise measurement shall comply with GB/T 2888, the noise limits should be consistent with the provisions of JB/T 8690's.

7.1 Marks

7.1.1 in the apparent position of the fan and auxiliary equipment shall be provided with nameplate, which includes.

a) type and name;

b) The main technical parameters. Fan pressure (or static pressure) units Pa, kPa; flow units m3/min, m3/h; motor power Unit kW; speed unit is r/min;

c) product number;

d) the date of manufacture;

e) manufacturer's name.

7.1.2 On the chassis fan should adjust the position and direction of rotation of the impeller sign axial fan should be medium flow direction signs.

7.1.3 product label size and technical requirements should be consistent with the provisions of GB/T 13306 of.

7.2 Packaging Fan package should comply with JB/T 6444, it shall be the number of the packing list, and the number of packaging items. 1102- Rights Proprietary Rights Reserved ISBN. 155 066 · 1-43286