JB/T 8523-1997 Technical requirements for explosion-proof ventilators

This standard specifies the technical requirements, test methods, inspection rules, warranty period, marking, packaging and transportation of general-purpose explosion-proof fans. This standard applies to fans used for ventilation and ventilation in explosive environments that transport gases below the minimum flash point concentration or flammable and explosive gas mixtures with air. The maximum temperature does not exceed 80°C, the dust content and other solid impurities do not exceed 100 mg/m3, and the diameter does not exceed 1mm. JB/T 8523-1997 Technical conditions for explosion-proof fans JB/T8523-1997 Standard download decompression password: www.bzxz.net

JB8523-1997
This standard is compiled by revising ZBJ72034-90 "Technical Conditions for Explosion-proof Fans". ① The explosion-proof safety of the electrical part is added. ② The single radial clearance between the impeller and the air inlet of the centrifugal fan is changed from the original standard (0.1%~~0.4%)Dt wheel to the radial single-side clearance of the fan with a machine number less than or equal to No.10 is 2.5~4mm, and the radial single-side clearance of the fan with a machine number greater than No.10 is (0.15%~0.4%)D impeller, but the minimum radial single-side clearance shall not be less than 2.5mm. ③ The radial unilateral clearance between the casing and the impeller of the axial flow fan is changed from the original standard (0.15%~0.35%)D-leaf to 2.5~4mm for fans with machine numbers less than or equal to No.10, and (0.15%~0.35%)D-leaf for fans with machine numbers greater than No.10, but the minimum radial unilateral clearance shall not be less than 2.5mm. ④ The assessment standard for the aerodynamic performance of the fan is slightly relaxed, and it is stipulated that the pressure value of the fan with machine numbers less than or equal to No.10 at the specified flow rate should not exceed -10%~+5% of the specified value, and the pressure value of the fan with machine numbers greater than No.10 at the specified flow rate should not exceed -5%~+5% of the specified value. This standard will replace ZBJ72034-90 from the date of entry into force. The appendix A and appendix B of this standard are both appendices of the standard. This standard is proposed and managed by the National Technical Committee for Fan Standardization. The drafting unit of this standard: Shenyang Blower Research Institute. The main drafters of this standard are Kong Fanwen and Peng Xiuman. 338
1 Scope
Machinery Industry Standard of the People's Republic of China
Explosion-proof Ventilator
Technical Conditions
JB85231997
Replaces ZBJ72034-90
This standard specifies the technical requirements, test methods, inspection regulations, warranty period, marking, packaging and transportation of general-purpose explosion-proof ventilators. This standard applies to fans for ventilation and ventilation that transport gases with concentrations below the minimum flash point or flammable and explosive gas mixtures formed with air in explosive environments. The maximum temperature shall not exceed 80°C, the dust content and other solid impurities shall not exceed 100mg/m, and the diameter shall not exceed 1mm.
This standard does not apply to explosion-proof fans for special purposes, such as marine explosion-proof fans, coal mine explosion-proof fans, etc. 2 Reference standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and the parties using this standard should explore the possibility of using the latest versions of the following standards. GB1236-85 Test method for aerodynamic performance of fans GB/T1804--92-General tolerances Unmarked tolerances for linear dimensions GB/T2888--91 Noise measurement method for fans and Roots blowers GB3235-82 Basic type dimension parameters and performance curves of fans GB 3836-83(87)
Explosion-proof electrical apparatus for explosive atmospheres
GB3836.1--83 General requirements for explosion-proof electrical apparatus for explosive atmospheres GB 9438--88
Technical conditions for aluminum alloy castings
GB/T 13274--91
GB/T 13275--91
Technical conditions for general-purpose axial flow fans
-Technical conditions for general-purpose centrifugal fans
GB/T 13306—91
JB/T 6445—92
JB/T 6886—93
ZB J72 038-90
ZB J72 039--90
ZB J72 042—90
Fan impeller overspeed test
Fan coating technical conditions
Fan welding quality inspection
Fan riveted welded parts technical requirements
Fan rotor balancing
MT113-85
Safety performance inspection specification for non-metallic (polymer) products used in underground coal mines 3 Technical requirements
3.1 Explosion-proof ventilators shall comply with the provisions of this standard and be manufactured according to the drawings and technical documents approved through the prescribed procedures or as agreed between the supply and demand parties.
3.2 The type, size, parameters and performance curve of explosion-proof ventilators shall comply with the provisions of GB3235. 3.3 The structure of explosion-proof ventilators requires that the rotating parts and adjacent stationary parts avoid collision to prevent sparks. Other aspects such as structural type, strength, rigidity, etc. should meet the following requirements: Centrifugal explosion-proof fans should comply with the relevant provisions of "Structure" in GB/T13275-91. Axial flow explosion-proof fans should comply with the relevant provisions of "Structure" in GB/T13274-91. Approved by the Ministry of Machinery Industry of the People's Republic of China on March 4, 1997 and implemented on October 1, 1997
JB8523-1997
3.4 ​​The explosion-proof motors and their auxiliary electrical components such as junction boxes and switches used in explosion-proof fans should comply with the provisions of GB3836 and have explosion-proof product certificates. Their manufacturers must have corresponding explosion-proof electrical equipment production licenses. 3.5 Under the specified working conditions, explosion-proof fans and auxiliary equipment should be kept at a service life of up to The design period is at least 10 years, and the safe operation time before the first overhaul is not less than 13,000 hours.
3.6 Product performance of explosion-proof fans
3.6.1 The pressure value of explosion-proof fans at the specified flow rate shall not exceed -10% to +5% of the specified value for fans with machine numbers less than or equal to No.10, and shall not exceed -5% to +5% of the specified value for fans with machine numbers greater than No.10. 3.6.2 The noise limit of explosion-proof fans at rated flow rate shall comply with the provisions of Appendix A (Appendix to the standard) for the A sound level. 3.7 The impeller shall be statically and dynamically balanced. The dynamic balancing accuracy shall not be lower than level G6.3. 3.8 The vibration accuracy of explosion-proof fans shall comply with the provisions of Appendix B (Appendix to the standard), and the bearing temperature shall not be higher than the ambient temperature of 40C. 3 .9 The critical speed of the rigid shaft of the explosion-proof fan should be more than 1.3 times the maximum operating speed. 3.10 The impeller of the explosion-proof fan should be subjected to an overspeed test. The impeller overspeed should be 110% of the maximum operating speed, and the overspeed time should be no less than 2 minutes. 3.11 The design of the materials of the explosion-proof fan parts, especially the rotating parts and the adjacent fixed parts, should not only meet the requirements of strength, toughness and wear resistance, but also consider explosion-proofness. For example, the air inlet door is made of steel plate, the impeller should be made of alloy aluminum, and the air inlet ring (the part adjacent to the impeller) should be kept rust-free or have a copper (H62) safety ring. If the impeller is made of steel (such as austenitic stainless steel 1Cr18Ni9Ti), the air inlet ring should be made of brass (such as H62) and corresponding brass rivets. If non-metallic Metal materials (polymers) shall comply with the provisions of MT113.
3.12 The tolerance of the overall dimensions of explosion-proof fans shall not be lower than the provisions of C (rough grade) in GB/T1804--92, and the position deviation of the inlet and outlet flanges shall not be greater than 1.2% of the position dimension. 3.13 The hole spacing tolerance of the drilled holes on the inlet and outlet flanges of explosion-proof fans shall not be greater than ±0.5mm. 3.14 The circular run-out tolerance of the inner diameter of the wheel cover of centrifugal explosion-proof fans shall be equal to or less than half of the minimum radial single-sided clearance between the impeller and the air inlet, and the circular run-out tolerance of the impeller end face shall not exceed the provisions of Table 1. Table 1 Impeller end face circular run-out tolerance
Wheel disc end face circular run-out
Wheel cover end face circular run-out
200～400
≥400~1 000
≥1 000~1 600
>1 600～~2 500
3.15 The verticality tolerance of the centrifugal explosion-proof fan impeller blade outlet edge to the wheel disc shall be less than or equal to 1% of the blade outlet width. 3.16
The flatness tolerance of the centrifugal explosion-proof fan impeller wheel disc shall not exceed the provisions of Table 2. Table 2 Wheel disc flatness tolerance
Wheel disc flatness
>120～400
≥400～~1 000
3.17 The deviation of the centrifugal explosion-proof fan blade outlet installation angle shall not be greater than ±1°. Fan
≥1000～2000
3.18 The tolerance K of the chord length of any three adjacent blades at the outlet of the centrifugal explosion-proof fan impeller shall be in accordance with the following provisions: Machine No
Machine No. ≥10
Machine No. ≥10～20
3.19 The casing and air inlet of the centrifugal explosion-proof fan should be flat, and no defects such as crushing, unevenness and skewness are allowed. The shape and position tolerance of the casing side panel should not exceed the provisions of Table 3. 340
>2 000~4 000
provisions.
Flatness of casing side plate
JB8523—
Flatness of casing plate
>120～400
≥400～1 ​​000
The runout tolerance of axial flow explosion-proof fan impeller shall not exceed the provisions of Table 4. Table 4 Runout tolerance of axial flow fan impeller
Radial and end face runout of hub
Radial runout of impeller outer diameter
End face runout of impeller outer diameter
>630～~800
≥1 000~-2 000
>2 000~-4 000
>800~1250≥1250~2 000|>2000~31502.0
The difference between the pitch (chord length) of the two corresponding end points of any three adjacent blades of the axial flow explosion-proof fan at the outer circle shall not exceed the blade pitch difference k in Table 5
>630~800
>800~~1250>1250~2000>2000~31506.0
The limit deviation and form and position tolerance of the casing size of the axial flow explosion-proof fan shall not exceed the provisions of Table 6. Table 6
Casing size deviation and form and position tolerance
Unprocessed cylinder inner diameter
Limit deviation
Parallelism tolerance of flange rings at both ends
Inner diameter roundness tolerance
≥630~~800
3The technical requirements for aluminum alloy castings shall comply with the relevant provisions of GB9438. 3.23
>800~1 250
>1 250~2 000|>2 000~3 150
All parts made of aluminum alloy must comply with the provisions of GB3836-83 (87) on aluminum alloy materials. +5.00
5The materials selected for welded parts should have good weldability. The technical conditions of riveted welded parts should comply with the provisions of ZBJ72039. The welding quality should comply with the provisions of ZB72038. The fan electric welding.T must be qualified before welding rotating parts. 3.26
The gap of riveted parts should not be greater than 0.1mm within the range of twice the rivet diameter, and should not be greater than 0.2~~0.3mm in other parts. The rivet head should be smooth and flat, and any loose rivet, skewed rivet head, cracks and unriveted rivets are not allowed. Assembly requirements
3.28.1 The radial single-sided clearance between the air inlet of the centrifugal explosion-proof fan and the inlet of the impeller cover should be uniform along the circumference. The radial single-sided clearance of the fan with a machine number less than or equal to No.10 is 2.5~4mm, and the radial single-sided clearance of the fan with a machine number greater than No.10 is (0.15%~0.4%)D blade, but the minimum radial single-sided clearance shall not be less than 2.5mm, and the axial overlap length shall be 0.8%~1.2% of the impeller diameter (same for D blade).
Impeller diameter, the radial clearance between the casing and the impeller of the axial-flow explosion-proof fan should be uniform, the radial single-side clearance of the fan with a machine number less than or equal to No.10 is 2.5-4mm, and the radial single-side clearance of the fan with a machine number greater than No.10 is (0.15%-0.35%)D) impeller, but the minimum radial single-side clearance shall not be less than 2.5mm.
JB8523-1997
3.29 The technical requirements for painting explosion-proof fans shall comply with the provisions of JB/T6886. The inner wall of the metal shell at the part where sparks may be generated shall be evenly coated with arc-resistant paint. The technical conditions of arc-resistant paint shall be in accordance with the provisions of C12 in Appendix C of GB3836.1--83. 3.30 There shall be grounding marks and devices that meet the explosion-proof requirements at appropriate places on the outer surface of the fan casing and the surface of the transmission components. 3.31 The mechanical safety protection of the fan shall be implemented in accordance with 3.31.1 to 3.31.3. 3.31.1 When the air inlet of the fan is directly released to the atmosphere, a fixed protective grille (or net) must be installed at the air inlet to prevent foreign matter from being sucked into the fan. In addition to considering factors such as the size of the fan and the working environment, the structural design of the protective grille (net) shall also consider the minimum air flow resistance caused by the addition of the protective grille (net).
3.31.2 Transmission groups, pulleys, couplings and other rotating transmission parts shall be covered with protective shields. The structure of the protective shields shall be strong and avoid contact with rotating parts. To avoid the accumulation of static electricity on the shield to generate sparks, the shield should be equipped with a reliable grounding device. 3.31.3 The rotating parts of the fan must be firmly fixed and have measures to prevent loosening. 4 Test method
4.1 Impeller dynamic balance correction
The impeller should be dynamically balanced on the dynamic balancing machine according to ZBJ72042. The dynamic balance accuracy should not be lower than G6.3 level. 4.2 Impeller overspeed test shall be in accordance with the provisions of JB/T6445. 4.3 Mechanical operation test
The explosion-proof fan should be subjected to a mechanical operation test, running continuously at the working speed, and measuring the bearing temperature rise and vibration after the bearing temperature stabilizes for 20 minutes. The technical requirements shall comply with the provisions of 3.8, and the vibration test method shall comply with the provisions of Appendix B. 4.4 Aerodynamic performance test
It shall be carried out in accordance with the provisions of GB1236. The technical requirements shall comply with the provisions of 3.6.1. 4.5 Noise test
It shall be carried out in accordance with GB/T2888, and the noise limit shall comply with the provisions of Appendix A. 4.6 Safety inspection
4.6.1 The first explosion-proof ventilator of a newly developed product must pass the safety inspection at a safety inspection unit recognized by the state. 4.6.2 A series of explosion-proof ventilator products must obtain a nationally recognized mechanical safety certification certificate. 5 Inspection rules
5.1 Inspection classification
The inspection of explosion-proof ventilators is divided into factory inspection and type inspection. 5.2 Factory inspection
5.2.1 Explosion-proof ventilators produced in batches shall be subject to factory inspection upon delivery. 5.2.2 Specific provisions for factory inspection: Axial flow explosion-proof ventilators shall be carried out in accordance with GB/T13274; centrifugal explosion-proof ventilators shall be carried out in accordance with GB/T13275.
5.3 Type inspection
5.3.1 Explosion-proof ventilators shall be subjected to type inspection in any of the following situations: a) the first product of each type of explosion-proof ventilator; b) the first product of each type of explosion-proof ventilator produced in a transferred factory; c) when there are major modifications to the design, structure, materials and process, which may affect product performance and safety requirements; d) when the factory inspection results are significantly different from the last type inspection; e) when the national quality supervision and inspection department proposes to conduct type inspection. 5.3.2 Type inspection: Axial flow explosion-proof ventilators shall be carried out in accordance with GB/T13274; centrifugal explosion-proof ventilators shall be carried out in accordance with GB/T13275. 5.4 Judgment rules
JB8523—1997
5.4.1 Each explosion-proof ventilator must be inspected and qualified by the quality inspection department of the manufacturer, and can only be shipped after a certificate of conformity is issued. 5.4.2 If the explosion-proof ventilators sampled are out of tolerance, they should be double-sampled, and those that meet the requirements are still qualified. If they are still out of tolerance, the batch of products is unqualified and should be repaired and inspected one by one before they can be shipped out of the factory. 5.5 User requirements
When the user needs to participate in the test and inspection of explosion-proof ventilators, it should be stipulated in the contract between the supply and demand parties. 6 Warranty period
Within no more than 18 months after delivery (calculated from the date of shipment), if the product is damaged or cannot work normally due to manufacturing quality problems, the manufacturer should repair or replace parts for the user free of charge. 7 Marking, packaging, transportation
7.1 Marking
7.1.1 A turning arrow, product label and explosion-proof mark should be installed in a conspicuous position on the fan casing. The content of the product label should at least include:
a) model and name;
b) main technical parameters: fan total pressure (or static pressure), flow, motor power, speed; c) product number;
d) manufacturing date;
e) manufacturer name and trademark.
7.1.2 The size and technical requirements of the product label should comply with the provisions of GB/T13306. 7.2 Packaging and transportation
7.2.1 Explosion-proof ventilators should be packed as a whole in packaging boxes as much as possible. For those that are inconvenient to pack as a whole, separate packaging can be used, but measures must be taken to ensure that the installation clearance and coaxiality of the product after on-site installation meet the product technical requirements. 7.2.2 Explosion-proof ventilators should be leveled, clamped and bolted in the packaging box. Disassembly tools and other parts should also be fastened and fixed in the gaps in the box to prevent movement and displacement during transportation 7.2.3 The documents accompanying explosion-proof fans include:
a) Product certificate;
b) Product manual or sample;
c) Packing list (complete set supply list). 7.2.4 The dimensions and weight of the packaging box shall comply with the regulations of the transportation department. 7.2.5 The structure of the packaging box shall be convenient for lifting, handling, long-distance transportation, multiple loading and unloading, climatic conditions, etc., and suitable for water and land transportation. Product damage, quality reduction or parts loss due to poor packaging will not occur. 343
JB8523--1997bzxz.net
Appendix A
(Appendix to the standard)
Regulations on noise limits for fans
A1 The LsA limit values ​​of the noise level of various types of fans at the highest efficiency operating point are shown in Table A1. Table A1
Fan type
Forward blade centrifugal fan
Backward plate blade centrifugal fan
Wing blade centrifugal fan
Radial blade centrifugal fan
Axial flow fan
Specific A sound level IsA, dB
The specific A sound level of fan noise is measured and calculated according to GB/T2888. The calculation formula is;
LsA=LA10lg(QP2) +19.8
Where: LSA
Specific A sound level of fan inlet (or outlet), dB (A); La—\—-A sound level of fan inlet (or outlet), dB (A); Q
Fan flow, m/min;
-Fan total pressure, Pa.
Appendix B
(Appendix to the standard)
Regulations on the vibration accuracy of ventilators
B1 The effective value of the vibration accuracy of the fan (root mean square velocity) shall not exceed 6.3mm/s. The measurement locations of the fan vibration velocity are as follows:B2
Measurement location
a) For fans with impeller diameters mounted on the motor shaft, the effective values ​​of the vibration velocity in the vertical, horizontal and axial directions (see Figure B1) shall be measured at the bearings at both ends of the motor stator, and the maximum reading shall be taken as the measurement value. When the motor is equipped with a fan cover, the axial vibration shall not be measured.
Horizontal direction
b) For fans with double bearings and two bearing bodies. The effective value of the moving speed of each bearing body shall be measured in accordance with the requirements of the three directions shown in Figure B2, and the maximum reading shall be taken as the measurement value. 344
JB8523-1997
Horizontal direction
c) When both bearings are installed in the same bearing box, measure the effective value of the vibration velocity at the bearing part of the bearing box according to the requirements shown in Figure B3, and take the maximum reading as the measurement value. Vertical
Horizontal direction
d) When the bearing box to be measured is inside the fan, according to the requirements of b) or c), a vibration sensor can be installed in advance. Then it is led out of the fan and the indicator reading is used as the measurement basis. The deviation between the sensor installation direction and the measurement direction shall not exceed ±5°B3 The vibration measuring instrument adopts a contact vibration measuring instrument with a frequency range of (10~~500) Hz and a speed range of (1~~10) mm/s. When measuring the vibration velocity value (effective value), it is not allowed to convert it with the displacement peak value. B4 The vibration measuring instrument must be qualified by the metrology department before it can be used. B5 The fan under test must be installed on a base or test bench with a mass greater than 10 times that of the fan, and the natural frequency of the device shall not be greater than 0.3 times the speed of the motor and fan.
B6 When testing the vibration speed, the influence of the external or surrounding environment on the base or test bench shall comply with the following provisions: The difference between the vibration speed of the fan when it is running and the vibration speed of the fan when it is stationary must be greater than 3 times. When the difference is less than this value, the fan shall take measures to avoid external influences.
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