Meaning of fan model parameters
1, model
Fan model is composed of basic model and supplementary model , divided into three groups, separated by a short horizontal. The basic models occupy two groups, which are expressed by the full pressure coefficient at the highest efficiency point of the fan, multiplied by 10, whichever is the integer and the specific revolution. The supplementary model accounts for the last group, which is indicated by the fan inlet suction type code and design serial number.
2. Machine No.
The outer diameter of the fan impeller is expressed in decimeters (dm). Integer or 1/2 (0, 5) prefixed with “№”.
3. Transmission mode
The fan transmission mode is specified in six forms, which are indicated by the Chinese pinyin alphabet.
4. Rotation direction
The rotation direction of the fan refers to the rotation direction of the impeller, and the code is written after the transmission mode.
5. The position of the air outlet
The position of the air outlet is divided into the air inlet and the air outlet, which are different according to the rotation direction of the impeller. Inlet angle. There are eight basic air outlet positions, and the representation method and original code can be added and supplemented for special purposes. See Table (5). The basic air inlet positions are five: 0°, 45°, 90°, 135°, 180°, special The exception is the use. If the fan of the air intake chamber is not installed, the position of the air inlet may not be indicated. The position of the air outlet is written as: the right (left) air outlet angle.
Meaning of centrifugal fan model parameters
The centrifugal fan model consists of basic model and supplementary model. If the basic model of the fan is the same, but the purpose is different, for the convenience of distinction, add a symbol such as “G” or “Y” before the basic model. “G” means a blower (blower) “Y” means an induced draft fan. The supplementary model number consists of two digits. The first digit represents the suction type of the fan inlet, represented by “0”, “1”, “2”, where “0” represents a double suction fan; “1” represents a single suction fan; “2” represents a two-stage series fan. The second digit represents the design serial number. The complete representation method of the fan model includes: name, model, machine number, transmission mode, rotation direction, outlet position and other parts.
The main performance parameters of the fan
1. Flow rate
The flow rate of the fan is the outlet flow rate It is expressed by the result of conversion into its intake state, usually expressed in m3/h and m3/min. However, when the inlet and outlet pressure ratios are below 1 and 03 (such as fans in the fan category), the outlet air volume is usually regarded as the same as the inlet air flow. In the chemical industry and other fields, it is mostly expressed by m3/h (normal temperature and normal pressure), which is to convert the flow into a standard state, that is, a dry state of 0 degrees Celsius, 0, and 1MPa. In addition, the mass m is sometimes expressed in Kg/s.
2. Pressure
For normal ventilation, there needs to be a pressure to overcome the resistance of the pipes, and the fan must generate this pressure. The pressure of the fan is divided into three forms: static pressure, dynamic pressure and full pressure. Among them, the pressure to overcome the aforementioned air supply resistance is static pressure; the form of converting the kinetic energy required in the gas flow into pressure is dynamic pressure. In practice, in order to achieve the purpose of air supply, both static pressure and dynamic pressure are required.
3. Power
The power transmitted by the motive force of the fan (usually a motor or a diesel engine, etc.) to the fan shaft is the shaft power N of the fan. The power obtained when the gas flows through the fan is called the effective power N1. The difference between the two is expressed as mechanical loss, volume loss and hydraulic loss.
4. Gas medium and density
Usually we mean the density of gas medium in the standard state, that is, the temperature is 0 degrees Celsius, the atmospheric pressure for 760mm Hg.
Declare: The above methods are derived from the program system index or shared by netizens. They are for your reference only and do not represent the research views of this website. sex and authority.
