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★ Properties and Uses

The company produces four a 72 -type fan with good aerodynamic performance , high efficiency, smooth running characteristics .

    Contained in the dust and hard particles should not exceed 150mg/m3, gas temperature does not exceed 8 this environment can be used as input

Gas , can be used as export gas .

★ Type

    From the motor side of the face , the impeller rotates clockwise , called D- blower to " right" : the impeller counterclockwise rotation, called L- blower to " left".

    Fan outlet location to the chassis of the outlet angle . No2.8-6 # factory are made ​​of a type , its angle adjustment range from 0 - 225 interval 45. No6-20 # exports made ​​from a fixed position of the three : Oy, 90v, 180, can not be adjusted .

    The fan drive with A, B, C, D four kinds . No2.8 a 6 # with A -type transmission , No6 -12 # using C, D type transmission , No16 a 20 # using C, D type transmission .

 ★ Structure

    4-72 type fan in Not. 8 -6 # mainly by the impeller , casing, air inlet with direct-motor and other components. In addition to a 20 # No6 with some of the above , there are transmission department.

    1, the impeller 10 backward wing -shaped leaves , curved front plate and the plate after plate composed by static and dynamic balance correction .

    2 , chassis made ​​of two different types , Not. 8 a 12 # casing made whole, can not open : No16 a casing made of two 20 # open along the horizontal plane carved separately bolted .

    3 , air inlet is made whole, mounted on the fan side parallel with the axial cross-sectional shape of the curve , the gas can successfully enter the impeller, and a smaller loss .

    4 , the transmission part of the spindle , bearing housing, bearings , pulleys or couplings components.

    "B4 a 72 -proof centrifugal fan for the explosion environment, transport concentration below the minimum flash point formed by gas or air flammable, explosive gas mixtures are generally used for ventilation purposes. Highest transmission medium temperature does not exceed 8 0 0c, dust content and other solid impurities is not greater than 100mg/m3, diameter less than lmma B4 a 72 -proof centrifugal fan , the fan performance and structure has the following characteristics :

    1 , fan basic types and structures , dimensions and four a 72 the same type , the user can directly use the performance table . Performance selection table is divided into ordinary and explosion-proof motors are two to choose from. Common to Ah series motor, explosion-proof as Ah B series motors.

    2, the fan rotating parts and stationary pieces of material adjacent to the design , in addition to meet the strength stiffness requirements , but also give full consideration to the explosion-proof . To avoid grazing , to prevent sparks , fan inlet using steel manufacturing, aluminum alloy impeller . The distribution of the explosion-proof motor and ancillary electrical components with GB3836 requirements and explosion-proof product certification, its manufacturer has a corresponding explosion-proof electrical equipment production license.

    3 , couplings and other transmission group rotating pulley transmission parts safety guard , solid structure and reliable fixation to avoid contact with rotating parts produced . To avoid the chassis , transmission group or electrostatic shield is gathering sparks in these parts has a reliable grounding device , the installation must be grounded this point , the land shall not be buried in the ground less than 2m, to ensure safety .

    4, the fan rotating parts , assembly time has been fixed firmly , and has measures to prevent loosening . Should be checked before driving the fan inlet and impeller wheel cover imports minimum radial clearance of not less than one-sided }. 5mm, to ensure safety.

5 , in order to prevent explosive gas leakage inside the casing , the casing cover and the spindle after the junction . With aluminum seals .

★ Security Tips

    1, when the use of explosion-proof fan inlet open to the atmosphere when directly . Inlet protection must be installed fixed grid ( or mesh ) to prevent foreign body aspiration fan inside . And the installation of additional protective devices should note that the user is responsible for two -proof fan guard can not offset occurs due to mishandling accident .

    2, A -type explosion-proof fan must be equipped with explosion-proof motors. When users use an ordinary motor, the user should take full account of the resulting system is the possibility of an accident .

    3 , explosion proof electric motor with attached electrical components such as junction boxes , switches, etc. shall comply with the provisions } aaea} . And have proof product certification . The manufacturers must have the appropriate explosion-proof electrical equipment production license. Wiring should standardize operations in order to avoid accidents resulting system is possible.

    4 , the correct installation and maintenance related to the fans called wow with explosion safety , for the entire life cycle of the fan . Should seriously according to the company's " fan installation, maintenance manual " for installation, commissioning, use and maintenance.



★ 4-72 centrifugal fan performance table