Total flow of centrifugal fan
1. Total flow
Explosion-proof and anti-corrosion fanThe total flow rate refers to the volume of steam passing through the centrifugal fan during the enterprise time. Enterprises have M3/h, M3/mln, M3/s. In China, M3/h is habitually used for blower motors, and M3/mln is used for blower motors, but M3/s is mostly used in the design and characteristic calculation of blowers.
Special attention must be paid to the total volumetric flow of the blower specifically refers to the total volumetric flow at the "inlet" of the blower. Since the working pressure of the blower is different in each flow cross section, the total flow of the volume through each flow cross section Will follow differently.
2. Full pressure
The total pressure of the blower is defined as the difference between the total pressure on the cross section of the outlet value of the blower and the total pressure on the cross section of the inlet.
The total pressure of a cyclone at a certain point or a certain cross-section is equivalent to the sum of the dynamic pressure and wind pressure at that point or the cross-section.
3. Dynamic pressure
The dynamic pressure of the blower is defined as the working pressure qualitatively analyzed by the mechanical energy of the steam on the cross section of the blower outlet value. Or: Dynamic pressure is the working pressure required to accelerate the velocity of the vapor from zero to a certain velocity.
The dynamic pressure is proportional to the mechanical energy of the cyclone.
Dynamic pressure only works on the position of the cyclone, and it coincides after all.
Pd＝0.6×ρV%*p2%*p%*b
Where Pd=dynamic pressure Sa
ρ= relative density of steam kg/m%*p3%*p%*b
V=velocity m/s.
11. Wind pressure
Explosion-proof and anti-corrosion fanThe wind pressure is defined as the total pressure of the blower minus the dynamic pressure of the blower. In fact, the wind pressure is the pressure difference between the absolute pressure and the atmospheric pressure at a certain point in the cyclone or a certain point in the indoor space filled with steam. When the working pressure at that point is higher than the atmospheric pressure, it coincides, and if it is less than this, it is a negative number.
The wind pressure energy works in every direction of the steam body, and is not related to the speed, and is a measure of the potential in the steam body.
Ps=P%*p%*pt%*b-Pd
Where Ps=wind pressure Sa
Pt=total pressure Sa
Pd=dynamic pressure Sa
4. Speed ratio
The speed ratio of the blower refers to the speed of rotation of the centrifugal impeller within the enterprise, usually called the angular speed, and is habitually expressed by n, and the number of rotations per minute is the enterprise (r/mln).
6. Shaft power
The shaft power of the blower refers to the actual output power of the centrifugal fan. It includes the internal output power of the centrifugal fan and the damage to the mechanical equipment of the rolling bearing and gear transmission.
Shaft power is also called the typed output power of the blower, which is actually the power of the electric motor.
11. High efficiency of blower
(1) High efficiency in full pressure of blower η%*p%*pin%*b
The full pressure internal high efficiency of the blower η%*p%*pin%*b is equivalent to the ratio of the reasonable output power of the blower full pressure to the internal output power.
(2) High efficiency in the air pressure of the blower η%*p%*Ps.In%*b
The high efficiency in the air pressure of the blower η%*p%*Ps.In%*b is equal to the ratio of the reasonable output power of the blower air pressure to the internal output power.
The high efficiency within the full pressure of the blower and the high efficiency within the air pressure of the blower are the key main parameters for the qualitative analysis of the aerodynamic characteristics of the centrifugal fan.
(3) Full pressure and high efficiency of blower η%*p%*ptf%*b
The full pressure and high efficiency of the blower η%*p%*ptf%*b is equivalent to the ratio of the reasonable output power of the full pressure of the blower to the shaft power.
(4) High efficiency of blower air pressure η%*p%*psf%*b
The high efficiency of the blower air pressure η%*p%*psf%*b is equivalent to the ratio of the reasonable output power of the blower air pressure to the shaft power.
8. Closed wind pressure (BTSP)
The closed wind pressure of the blower refers to the wind pressure when the blower outlet value is completely closed without steam body.
0. Full opening gas pressure of blower (WOCMS)
The full opening gas pressure of the blower is also called the open cms source code (WOCMS), that is, the total flow of the centrifugal fan when the full opening is in operation. At this time, the wind pressure of the centrifugal fan is zero.
11. Application category
It is determined by the manufacturer of the centrifugal fan that the total operating flow and working pressure range of the centrifugal fan must be satisfactorily achieved during the operation of the centrifugal fan.
Typical applications of centrifugal fans:
Forward-curved centrifugal fan: 40%-90% WOCMS
Backbend centrifugal fan: 50%-86% WOCMS
Axial centrifugal fan: 45%-90% WOCMS