High Speed Centrifugal Blower

Series B Single-stage High-speed Centrifugal Blower is the new product which designed by Shandong Zhangqiu Blower Co., Ltd and Xi'an Jiao Tong University. The pneumatic performance and structural design of the series of products has reached the advanced level of similar products at home and abroad. The blowers are widely used in sewage water treatment, metallurgy, fluidization of circulating fluidized bed boiler in power station, exhaust gas desulphurization, pharmacy, gas booster and so on.

Product Features

Advanced impeller profile curve and high efficiency

The ternary flow theory design of the impeller and the application of flow analysis technology forecasting performance of blower make the polytropic efficiency to reach up 82%.

The flow capacity can be controlled in the wide range, and the blower can be applied to variety of working conditions.

The blowers are adopted axial air-inlet guide vane, flow capacity control range is the rated flow capacity of 60% to 110%, so operating efficiency of blower is also high at non-rated condition. And the blowers are adopted anti-surge device, it can avoid the blower surge effectively.

The compact blower structure and small size.

The blowers are adopted integrated structure of assembly-type, in details, the blower body is assembled on the casing of gear accelerating box, the lubricating oil system distributed, the motor and gear accelerating box are installed on the common pedestal compactly; the pedestal doubles as a oil tank.

After strict dynamic balance, the rotor has low vibration, high reliability and low overall noise.

The Moment of inertia of rotor is small, the startup and stop time has been decreased and the oil box with high oil level and accumulator has been abrogated. Compared with the multistage centrifugal blower of same flow capacity and pressure, this product enjoys low energy consumption, light weight and small size.

The structure of blower is advanced and reasonable. Easy-worn parts are few. Installation, operation and maintenance are convenient.

The parameters (such as bearing vibration of whole machine, temperature rise; inlet and outlet pressure and temperature; anti-surge control; start of the interlock protection; failure alarm; oil pressure of lubricating system, oil temperature control and so on) are controlled by programmable logic controller that can be get real-time control. The whole machine has no easy-worn parts and the daily maintenance is convenient.

Main Structure

Guide Vane Controller The Guide Vane Controller is installed in front of the impeller. It consists of casing, guide vane, impeller cover, electric actuator, adjustable diffuser etc. The clearance between the impeller cover and the impeller insure stable running of the blower. The angle degree of guide vane is adjusted by electric actuator, it makes the air flow pre-rotate before coming into the impeller. The using of adjustable diffuser makes the running of blower with more wide range.
Impeller The impeller design is based on the ternary flow theory, enjoys high efficiency. Each impeller is dynamically balanced after precision machining, and all impeller get through the test of the rated 1.15 times speed and strength test. In order to meet the needs of different conditions, the impeller materials could be optional, such as cast aluminum, forged steel and stainless steel etc.
High-speed Rotor The high-speed rotor is consists of the impeller, the high-speed gear and the high-speed shaft. Impeller and high-speed shaft are connected by rod and torque transmission is by end pins. The dynamic balancing test accords to the international standards and the precision could reach G1 grade to ensure the operation to be smooth and reliable.
Volute Casing This part adopts round section volute casing, and the profile line of the scrollwall is designed to be the logarithm spiral line, meet the airflow law of motion and it is low impact to blower, so the blower is high flow efficiency, low vibration and low noise.
Gear The acceleration gear pair adopts the involute tooth profile. The surface of gearwheel and pinion gets through the grinding and nitride-harden treatment to maintain the high speed stable operation, low vibration and low noise. The lifetime can be 20 years.

Bearing

The high-speed shaft support, composed by many flexible pads, adopts tilting pad journal bearing. The pads could deflex around the fulcrum, its anti-vibration performance and automatically adjusting ability according to the variation of load and speed are both excellent.

Seal

This part adopts the split type labyrinth seal structure, which could be changed without dismantling the impeller, with effective air-tightness and replaces easily.

Lubrication System

The lubrication system is consists of the oil tank and the oil pipeline. The pedestal doubles as a oil tank, the immersion-type electric heater and temperature control switch are both included in the oil tank. The oil pipeline is composed of the main oil pump, the electric pump, the double cylinder oil filter etc.

The main oil pump would be driven by the low-speed gear and it supplies the pre-lubrication to gear and bearing with certain pressure when the units operate normally. The electric pump would supply the pre-lubrication before the units start and keep the oil pressure still under the emergency and downtime. The electric pump also plays a role of stand-by oil pump.

The oil filter with double cylinder is high-precision. The pressure difference alarm device on filter is also equipped.

Monitoring and Control System

The monitoring and control system are designed for protecting running of single-stage high-speed centrifugal blower.

The startup is provided with the mode of interlock, anti-surge control, the accessorial pump automatic start & stop according to the oil pressure, protection for over high bearing temperature and vibration.

There are oil pressure sensors on oil-supplying pipeline, oil temperature sensors following oil coolers, temperature sensors and vibration sensors on high speed sliding bearings.

The inlet and outlet pipeline are equipped with primary & secondary meters and transmitter to measure air temperature & pressure, so that, it can monitor the parameters real-time, to ensure the safe, stable and reliable operation of the blower.