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

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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
112
125| |tt||140
160
180
200
224
250
280
315||tt ||355
400
450
500
560
630
710
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
800
900
1000
1120
1250
1400
1600
1800
2000
mm| |tt||1994-07-01 Implementation
D
R20
100
112
125
140||tt| |160
180
200
224
250
280
315
355
400
450
500
560
630
710
800
900
1000|| tt||1120
1250
1400
1600
1800
2000
d
120||tt| |137
150
165
185
205
225
254
280
320
355
395
450
500
560
620
690
770|| tt||860
970
1070
1190
1320
1470
1680
1880||tt| |2080
dp
2
10
12.5
15
20
25
30
35
40
N
12
16
20
24
JB/ T6885—93
Table 2
d2
90
10
45
30
22.5||tt| |18
15
12
15
19
d3
6
8
10
12
16
d
12
16
20
24
30|| tt||mm
Thickness
(reference)
2.5
wide
3.5
8
333|| tt||F
...-.
R20
315
355
400
450
500
560
630
710
800
900
1000
1120
1250|| tt||1400
1600
1800
2000
D
R40
300
315||tt| |335
355
375
400
425
4.50
475
500
530
560
600
630
670
710
750
800
850|| tt||900
950
1000
1060
1120
1180
1250
1320||tt| |1400
1500
1600
1700
1800
1900
2000
Additional notes: ||tt| |di
340
355
375
395
415
450
475
500
525
560
590
620
660
690
730
770|| tt||810
860
910
970
1020
1070
1130
1190||tt| |1250
1.320
1390
1.470
1570
1680
1780
1880
1980
2080
dD
2| |tt||20
25
30
35
40www.bzxz.net
JB/T 6885-93
Appendix A||tt ||(reference)
Table A1
N pieces
8
12
16
20
24
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
Q
90
30
30
22.5
18|| tt||15
10
12
15
19
d
8
10||tt| |12
16
d.
16
20
24
30
Size》No. 1 in 1981 Version.
Circular flange one
mm
Thickness (test)
2.5
3
3.5
5| |tt||6
8
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