JB/T 6885-1993 Ventilator circular flange dimensions

This standard specifies the dimensions of circular flanges of general-purpose ventilators. This standard is applicable to general-purpose air machines and their pipe network usage that convey non-toxic, unsaturated, non-corrosive, non-flammable, non-abrasive particles and a temperature not exceeding 80°C (not exceeding 40°C if the motor or fan bearing is in the air flow). orchid. This standard does not apply to large, special-purpose ventilators with larger flange thicknesses. JB/T 6885-1993 Ventilator circular flange dimensions JB/T6885-1993 Standard download and decompression password: www.bzxz.net

Machinery Industry Standard of the People's Republic of China||tt ||Dimensions of round flange of ventilators
Subject content and scope of application
This standard specifies the dimensions of round flanges of general-purpose ventilators. JB/T6885--93
This standard is suitable for conveying non-toxic, unsaturated, non-corrosive, non-flammable, non-abrasive particles and the temperature does not exceed 80C (if the motor or fan bearing is in the air flow, it does not exceed 40℃ 》Flanges for air ventilators and their pipe networks. This standard does not apply to large-scale, special-purpose ventilators with larger flange thicknesses. 2 Reference standard
GB95--85 Flat Washer Class C||tt ||GB 97.185 Flat Washer—Grade A
GB97.2-85 Flat Washer Chamfer Type—Grade A
GB321—80 Priority Number and Priority Number System
3 Technical Requirements| |tt||3.1 The size of the impeller outer diameter should comply with the R20 basic series given in GB321. For medium-sized ventilators, it is recommended to use the R40 basic series (Appendix A). In special cases, the increase in the impeller outer diameter size is smaller. The fan is allowed to use R80 to supplement the series values. 3.2 The number of flange holes should be an integer divisible by 4, and should be arranged equidistantly from the pitch circle line coaxial with the outer axis of the impeller. The casing is divided into two parts, allowing the flange to be divided into two halves. 3.3 The gasket should be selected according to GB97.1, GB97.2 or GB95. 3.4 The specifications of the general purpose ventilator are marked with the outer diameter of the wheel (i.e. the nominal diameter of the ventilator). Diameter design ventilator. The nominal diameter adopts R20 series. The specifications of ventilators from 100mm to 2000mm are as shown in Table 1. Table 1 Impeller outer diameter (ie nominal diameter of ventilator) D100
125| |tt||140
315||tt ||355
Impeller diameter greater than 2000mm, R20.R40 or R80 series can also be used. 3.5 flange and assembly hole dimensions (see the figure and table 2 below) Approved by the Ministry of Machinery Industry of the People's Republic of China on 1993-07-13 332
mm| |tt||1994-07-01 Implementation
140||tt| |160
1000|| tt||1120
120||tt| |137
770|| tt||860
1880||tt| |2080
JB/ T6885—93
Table 2
22.5||tt| |18
30|| tt||mm
Thickness
(reference)
333|| tt||F
1250|| tt||1400
315||tt| |335
850|| tt||900
1320||tt| |1400
Additional notes: ||tt| |di
770|| tt||810
1190||tt| |1250
2| |tt||20
JB/T 6885-93
Appendix A||tt ||(reference)bzxZ.net
Table A1
N pieces
This standard is proposed by the National Technical Committee for Fan Standardization. This standard is drafted and managed by Shenyang Blower Research Institute. The main drafters of this standard are: Chen Mingliang and Tian Suwen. This standard is equivalent to ISO65801 "General Industrial Fan - 334
18|| tt||15
10||tt| |12
Size》No. 1 in 1981 Version.
Circular flange one
Thickness (test)
5| |tt||6
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