What Is a Blower Assembly?

The centrifugal blower uses the centrifugal force generated by a working wheel equipped with many blades to squeeze air to achieve a certain amount of air pressure and pressure.

This type of compressor is called a centrifugal compressor because it continuously sucks refrigerant vapor and is continuously thrown out in the radial direction when it works. Which is divided into single-stage and multi-stage according to the number of working wheels installed in the compressor. If there is only one work wheel, it is called a single-stage centrifugal compressor. If it consists of several work wheels in series, it is called a multi-stage centrifugal compressor. In air conditioners, single-stage is generally used because the pressure increases less. Most of the centrifugal refrigeration compressors used in other areas are multi-stage. The structure of a single-stage centrifugal refrigeration compressor is mainly composed of a working wheel, a diffuser and a volute. When the compressor is operating, the refrigerant vapor enters the suction chamber axially from the suction port, and the diversion effect of the suction chamber guides the refrigerant vapor from the evaporator (or intercooler) to uniformly enter the high-speed rotating work wheel. (The working wheel is also called the impeller, which is an important part of the centrifugal refrigeration compressor, because energy can be transferred to the gas only through the working wheel). Under the action of the blade, the steam body rotates at a high speed following the working wheel, and due to the centrifugal force, it diffuses and flows in the blade channel, thereby increasing the pressure and speed of the steam body. The steam coming out of the work wheel then enters the diffuser with a gradually enlarged cross-sectional area (because the steam has a higher flow rate when it flows out of the work wheel, the diffuser partially converts the kinetic energy into pressure energy, thereby improving the steam's pressure). As the gas flows through the diffuser, the speed decreases and the pressure increases further. After the diffuser, the steam is collected in the volute, and then guided to the intercooler or condenser through the exhaust port. ^[1]

Compared with piston refrigeration compressors, centrifugal refrigeration compressors have the following advantages:

(1) The single machine has a large cooling capacity. When the cooling capacity is the same, it has a small volume, a small footprint, and a weight that is 5-8 times lighter than a piston type.

(2) Because it has no vulnerable parts such as steam valve piston rings, and no crank link mechanism, it has reliable operation, stable operation, low noise, simple operation, and low maintenance costs.

(3) There is no friction between the work wheel and the casing, no lubrication is required. Therefore, the refrigerant vapor does not contact the lubricating oil, thereby improving the heat transfer performance of the evaporator and the condenser.

(4) The cooling capacity can be adjusted economically and conveniently with a large adjustment range.

(5) The adaptability to refrigerant is poor. A centrifugal refrigeration compressor with a certain structure can only adapt to one refrigerant.

(6) Since it is suitable to use a refrigerant with a relatively large molecular weight, it is only suitable for large cooling capacity, and is generally above 250,000 to 300,000 kcal / hour. If the cooling capacity is too small, the flow rate is small and the flow channel is narrow, so that the flow resistance is large and the efficiency is low. However, after continuous improvement in recent years, the centrifugal refrigeration compressor used for air conditioning can reduce the cooling capacity of a single unit to about 100,000 kcal / hour. ^[1]

With the rapid development of China's industrialization and the improvement of the economic level, the production of industrial wastewater and domestic sewage has also increased tremendously. A large number of sewage treatment plants have been built nationwide. Currently, activated sludge is the most widely used and mature method in sewage treatment processes. One of the indispensable equipment in this process is the blower. The blower sends compressed air into the pool through aeration and diffuses oxygen into the mud-water mixture in the form of bubbles. The aerobic microorganisms in the sludge grow. Needed. At present, commonly used blowers include Roots-type blowers, centrifugal blowers, etc. In the sewage treatment process, the energy consumption of the aeration system of the blower accounts for more than half of the energy consumption of the entire process system. It plays a vital role. The air suspension centrifugal blower has the advantages of high efficiency, low noise, low wear, energy saving and environmental protection. This blower uses the two core technologies of "high-speed direct-connected motor" and "air suspension bearing". Green environmental protection equipment without cooling system and oil lubrication system.

Main components of centrifugal blower

The main components of air suspension centrifugal blowers are air suspension bearings, motors, inverters, vent valves, etc. All components are installed on a common base as a whole. Air suspension bearings are one of the most critical components of the blowers. Suspension, maintaining high-speed operation, compared with traditional bearings, no contact, no lubricant, low friction, low energy loss during operation , High efficiency, stable operation and other characteristics; through the inverter to adjust the air volume and pressure, a wide range of adjustment, high accuracy, the maximum efficiency increase of nearly 30%. In short, the air suspension centrifugal blower has the characteristics of high efficiency, low energy consumption, low noise, simple installation and convenient maintenance.

Application of centrifugal blower air suspension centrifugal blower in sewage treatment

In the wastewater treatment process, the blower mainly provides oxygen for the aerobic biochemical process and maintains the growth of aerobic microorganisms, and is used for mixing and stirring, preventing sludge precipitation, further contacting pollutants with microorganisms, and removing organic matter. At present, sewage treatment plants Commonly used blowers are Roots blowers, stand-alone high-speed centrifugal blowers, air suspension centrifugal blowers, etc. The performance comparison of the three types of blowers is shown in Table 1. From Table 1, it can be seen that air suspension centrifugal blowers are more efficient than other two types of blowers. Low energy consumption, wide adjustment range, small equipment footprint, simple installation and convenient maintenance, it has broad application prospects in sewage treatment.

In the sewage treatment process, the energy consumption of the blower aeration system accounts for more than half of the energy consumption of the entire process system. The use of air suspension centrifugal blowers can achieve the effect of saving electricity and saving costs.

The energy consumption of the blower aeration system accounts for more than half of the energy consumption of the entire process system. Under the premise of China's vigorous promotion of energy conservation and emission reduction, the use of energy-efficient blowers is an inevitable development trend. Air suspension centrifugal blowers have high efficiency and energy efficiency. The advantages of low consumption, low noise, simple installation, and convenient maintenance will have broad application prospects in sewage treatment. ^[2]