MT 222-1996 Local ventilation fans for coal mines MT222-1996 Standard download decompression password: www.bzxz.net

Coal Industry Standard of the People's Republic of China
Local Ventilators for Coal Mines
Subject Content and Scope of Application
MT 222-1996
MT222-90
This standard specifies the classification, technical requirements, test methods, inspection rules, marking, packaging, transportation and storage of local ventilators for coal mines (hereinafter referred to as ventilators).
This standard applies to ventilators driven by flameproof motors in underground coal mines, and does not apply to local ventilators other than those driven by electricity and counter-rotating local ventilators.
2 Reference standards
GB1236 Test method for aerodynamic performance of ventilator GIB/T2888 Noise measurement method for fan and Roots blower GB3836.2 Explosion-proof electrical equipment for explosive atmospheres Flame-proof electrical equipment\d” GB10111 Random sampling method using random numbers GB/T13306 Signs
Test method and judgment rule for friction spark safety of metal materials used in coal mines GB 13813
MT113 General test method and judgment rule for flame retardancy and antistatic properties of polymer products used in coal mines JB/T6445 Overspeed test method for impeller of ventilator JB/TQ334
ZB J72 038
ZB J72 039
ZB J72042
JB/TQ 339
3 Terminology
Ventilator vibration accuracy
Ventilator welding quality inspection
Ventilator riveted parts technical requirements
Ventilator rotor balance
Ventilator product appearance quality and cleanliness
3.1 Push-in local ventilator
Ventilation equipment used to deliver fresh air flow to local ventilation locations through the air duct under positive pressure. 3.2 Extraction local ventilator
Ventilation equipment used to exhaust the exhaust air in the local ventilation location through the air pipe under negative pressure and discharge it to the designated location. 3.3 Economic working area
The working area of ​​the fan determined by 90% of the maximum full pressure efficiency of the fan. 3.4 Top clearance
The vertical distance between the top of the blade of the diagonal flow fan impeller and the casing. 3.5 Specific A sound level LsA
The A sound level of the fan at unit flow base and unit full pressure, its mathematical expression is: IsA - LA -10 IgQP2 - 2
Specific A sound level of the fan when it is operating at the highest efficiency condition, dB; formula: LsA
The sound level of the fan in dB when it is operating at the highest efficiency; Approved by the Ministry of Coal Industry of the People's Republic of China on March 13, 1996 and implemented on August 1, 1996
MT222—1996
Q—The flow rate of the fan when it is operating at the highest efficiency, m/s; P
The total pressure of the fan when it is operating at the highest efficiency, Pa. 4 Fan classification
4.1 Type
Fans are divided into according to the flow direction of the airflow after entering the impeller : Axial flow fans, centrifugal fans and oblique flow (mixed flow) fans.
According to their uses, fans are divided into push-in local fans (hereinafter referred to as push-in fans) and exhaust local fans (hereinafter referred to as exhaust fans) in which the flameproof motor is placed outside the flow channel or inside the flow channel, and the flameproof motor is placed in the explosion-proof sealed cavity. 4.2 Structural dimensions
4.2.1 The fan is mainly composed of a collector, an impeller, a guide, a casing and a motor. 4.2.2 The transmission mode of the fan is a direct drive of the motor. The fan impeller can be in the form of axial flow, oblique flow, centrifugal, etc. The blades are divided into airfoil type and circular plate type. 4.2.3
The fan impeller is generally single-stage or two-stage. 4.2.4
The fan casing is a circular cylinder.
4.2.6 The machine number of the fan is indicated by the decimeter of the impeller diameter and the symbol \No.". 4.2.7
The machine number and diameter of the fan shall comply with the provisions of Table 1: Table 1
Note: The machine number with "^" is preferred.
4.3 Connection size
Impeller (blade edge)
Diameter, mm
Impeller (blade edge)
Diameter, mm
4.3.1 The flange connection structure and size of the fan shall be in accordance with Figure 1 for push-in fans and Figure 2 for exhaust fans, and comply with the provisions of Table 2.128
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MT222--1996www.bzxz.net
Continued Table 2
Note: (i) d. · Nominal diameter of fan impeller d Flange hole center circle diameter N Number of flange holes: d Flange hole diameter d True diameter of legal connection bolts Simple wall thickness.
For fans with oblique flow and externally wrapped compound silencer structures, the flange size can be increased or reduced according to the provisions of Table 2 4.3.2 The diameter of the air inlet and outlet of the exhaust fan should generally be consistent with the specifications and dimensions of the positive pressure wind tube or negative pressure wind tube used in coal mines. If a transition joint is used, its shape, The dimensions shall be in accordance with Figure 3 and in accordance with the provisions of Table 3. Expanded-sensitivity type
5 Technical requirements
General requirements
Table 3 Diameter of inlet and outlet ports
Effective type
5.1.1 The fan shall comply with the requirements of this standard and be manufactured in accordance with the drawings and technical documents approved by the prescribed procedures or in accordance with the requirements of the agreement between the supplier and the buyer.
5.1.2 The materials and accessories used for the fan shall comply with the provisions of the corresponding standards. Self-made parts and outsourced parts shall be inspected and qualified before they can be assembled. Purchased parts shall have a certificate of conformity and a safety mark permit and It can be used only after acceptance. 5:1.3 The casing of the fan should have sufficient rigidity to ensure that the casing will not be deformed due to collision. It should also have holes or hooks for lifting, and a skid can also be installed.
5.1.4 After the fan is assembled, a mechanical operation test is carried out. The operation should be smooth and without abnormal noise. 5.1.5 Fans are generally designed for horizontal installation. For axial flow fans with machine numbers less than or equal to No. 6.3, they can be designed with an axial inclination angle of less than 30°. 5.1.6 The fan should have a service life of not less than 4 years and should be operated before the first overhaul. 12000h for design. 5.2 Safety requirements
5.2.1 The electrical explosion-proof performance of the supporting motor of the fan must comply with the provisions of GB3836.2, and obtain the explosion-proof electrical equipment inspection certificate and safety mark approval certificate.
5.2.2 The metal materials of the blades and shell (or protective ring) of the exhaust fan impeller (the impeller should not be made of aluminum alloy) must be inspected for friction spark safety by the National Coal Mine Dust and Ventilation Safety Product Quality Supervision and Inspection Center, and obtain the inspection certificate. 130
MT 222--1996
5.2.3 The polymer products used in the fan must comply with the provisions of MT113 and obtain the inspection certificate. 5.2.4 The radial clearance between the blades of the exhaust axial flow fan impeller and the casing (or protective ring); the radial clearance or axial clearance between the wheel cover and the air intake row (or protective ring) of the exhaust centrifugal fan impeller; the top clearance between the top of the impeller blade of the exhaust diagonal flow fan and the casing (or protective ring) must be greater than 2.5mm. 5.2.5 The cold insulation resistance of the fan motor winding must be higher than 0.38MQ when the rated voltage is 380V; it must be higher than 0.66MQ when the rated voltage is 660V; it must be higher than 1.14MQ2 when the rated voltage is 1140V. 5.2.6 The air inlet of the fan must be equipped with a fixed protective grid to prevent foreign matter with a particle size greater than 50mm from entering the fan. 5.2.7 The rotating parts of the fan must be firmly fixed and have measures to prevent loosening. 5.2.8 The fan must have a grounding device and a permanent grounding mark. 5.3 Quality requirements
5.3.1 The appearance quality of the fan shall comply with all provisions of JB/TQ339 except for Articles 1.7, 1.8, 2.2 and 2.3. 5.3.2 The radial clearance between the impeller blades and the casing of the forced-in axial flow fan shall be 1.5% to 3.5% of the nominal diameter of the impeller. The radial clearance between the impeller cover and the air inlet of the forced-in centrifugal fan impeller shall be 1.5% to 4.0% of the nominal diameter of the impeller; the axial overlap length between them shall be 8% to 12% of the nominal diameter of the impeller. The top clearance between the impeller blades and the casing of the forced-in diagonal flow fan impeller shall be 1.5% to 3.5% of the nominal diameter of the impeller. 5.3.3 Product performance
5.3.3.1 All fans shall be subjected to aerodynamic performance tests and typical air performance curves shall be drawn. 5.3.3.2 The fan shall have stable aerodynamic performance. In the working area, its performance curve should be smooth without any breaks or sudden changes. 5.3.3.3 The maximum full pressure efficiency of the push-in ventilator should comply with the requirements of Table 4. Table 4
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