The YAHED7 and YAHED8 series of medium-pressure centrifugal fans are a kind of dust removal and environmental protection fans. They are equipment used to improve air and improve air convection, which can effectively achieve in-situ dust purification and have high dust removal efficiency for respirable dust. Prevent the human body from inhaling, which is beneficial to human health. The working principle of the general fan is basically the same. When the impeller rotates at a high speed, all parts of the air in the impeller are also driven to rotate together. At this time, the air at the center of the impeller will be thrown to the edge of the impeller due to centrifugal force. A vacuum is formed in the center, so the external air constantly flows in under the action of the pressure difference and supplements to the center of the impeller, so that the ventilator has the ability to suck in air. Since the speed of air leaving the impeller blades in rotation is much greater than the airflow speed in the space around the impeller, this makes part of the kinetic energy of the gas in motion converted into static pressure energy. In the process of converting kinetic energy into static pressure energy, the volute of the fan The space presents a positive pressure, so that the fan has the ability to transfer gas into the impeller, and then convert part of the kinetic energy into static pressure energy in the impeller, and then flow into the volute channel, and then discharge through the air outlet. It is a high-efficiency, high-pressure centrifugal fan. 1 Purpose As a general indoor ventilation of factories and buildings, it can be used as input gas and materials, and can also be used as output gas and materials. The transport gas types are air and other gases that are not spontaneously combustible, harmless to the human body, and non-corrosive to steel materials. No sticky substances are allowed in the gas, the dust and hard particles contained are not more than 150mg/m3, and the temperature of the gas must not exceed 80C.
Form: YAHED7 and YAHED8 medium-pressure centrifugal fans are single suction fans. There are three main types of installation, A-type, C-type, and D-type. Among them, Type A is motor direct connection, and the temperature of the conveying medium can reach up to 180°C; Type C is belt drive, and the temperature of the conveying medium can reach up to 800C; Type D is coupling drive and cantilever installation.
This series of fans can now be made into two types of right-handed fans and left-handed fans. When viewed from one end of the motor, the impeller rotates in a clockwise direction, which is called a right-handed fan. It is represented by "right" and rotates counterclockwise, which is called a left-handed fan. Fan, indicated by "left".
The outlet position of the fan is expressed by the angle of the air outlet of the casing. Both “left” and “right” can be made into three kinds of movable angles: 0°, 90↵, 180↵, etc., which can be adjusted. If there is a special angle, it must be adjusted. Specify when ordering.
The drive mode of the fan is Type A (No.4~No.6.3), Type D (No.7.1-No.15), and Type C (No.3.15~No.15).
Structural features: YAHED7 and YAHED8 medium-pressure centrifugal fans are mainly composed of impeller, casing, air inlet, motor and motor base. Belt-driven models have transmission parts and bases in addition to the above parts. Part and other components.
1) YAHED7 and YAHED8 impellers are composed of 12 blades. The fan impeller blades of these two series are all backward inclined flat blades. It is welded with the cone-arc front disc and the flat back disc. It is made of steel plate or stainless steel and has been adjusted for static and dynamic balance. It has good air performance, high efficiency, low vibration, high strength, and stable operation.
2) The casing is welded by steel plates, and the whole adopts a welded structure, which is easy to install. At the same time, the casing is interchangeable for easy installation and use. No3.15~No.12.4 housings are made as a whole and cannot be disassembled; under special circumstances, the housings are made up and down, divided into two halves along the midpoint horizontal plane, and connected by bolts.
3) The air inlet is installed on the front side plate of the fan, on a section parallel to the main shaft, made into a converging and diverging streamlined overall structure, and fixed on the inlet side of the casing with bolts.
4) The stator of the motor is fixed and the impeller is installed on the main shaft extending from the rotor. The rotor of the motor rotates to drive the impeller installed on the main shaft to rotate. The soft start method can be used when the motor is started to evenly adjust the fan speed to meet the changing requirements of the system load.
5) The transmission part is composed of the main shaft, bearing box, rolling bearing, belt wheel or coupling, etc. The main shaft is made of high-quality steel quenched and tempered, the bearing box adopts an integral bearing box, and the bearings for the bearing box adopt deep groove ball rolling bearings. The products of NSK, SKF and other companies are selected, and the new structure of the shaft end seal is adopted to ensure that the lubricating oil does not leak and keep the operating environment clean. The whole is lubricated with bearing grease.
6) Protection. The exposed rotating part of the ventilator is covered with a protective cover to play a protective role. All C-type and D-type fans have belt covers outside the pulleys or couplings for protection. Observation windows and cooling holes are reserved on the belt cover to facilitate belt heat dissipation. At the same time, the observation windows are convenient for observing the rotation direction of the fan. .
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