Blower Product Classification

Roots blower
Roots blower is a positive displacement blower, a type of rotary blower, which uses two bladed rotors or three bladed rotors to make relative motion in the cylinder to transport gas. Due to the continuous rotation of the rotor, the pumped gas is sucked from the air inlet into the air space between the rotor and the pump casing, and then discharged through the exhaust port. The gas does not undergo an internal compression process when passing through the Roots blower.
Roots blower is a commonly used blower in small and medium-sized sulfuric acid plants. When the required air volume is small, centrifugal blowers are often not suitable because of their small impeller diameter and the difficulty of achieving the pressure head required for sulfuric acid production at a speed of 2950 revolutions per minute. Roots blower has the advantages of both reciprocating compressors and centrifugal blowers. It has the characteristics of a reciprocating compressor that the air pressure changes slightly when the speed is constant, and the air volume can remain unchanged, that is, the proportional relationship between the speed and the air volume is maintained. It also has the advantages of a centrifugal blower, such as high speed, no air valve and crankshaft, light weight, and easy application. The disadvantage is that when the outlet is blocked, the pressure is likely to increase and even cause damage to the machine itself. After long-term use, the air supply volume decreases due to the expansion of the gap between the two rotors and the gap between the rotor and the casing.
Blast furnace blower
Current blast furnace blowers all use blade fans, mainly centrifugal and axial flow. Centrifugal blowers have the advantages of simple structure, reliable operation, high design point efficiency, and low noise. Centrifugal blast furnace blowers have relatively mature manufacturing and use experience in China, and blast furnaces below 400m3 are widely used in industrially backward areas and countries. However, with the increase in blast furnaces, the adjustment loss, external dimensions and weight of centrifugal blowers have increased significantly, which brings great difficulties to manufacturing, transportation, installation and maintenance, and is also limited by factors such as the rotating parts-impeller material strength, main shaft stiffness, motor start-up, etc., which reduces the reliability and economy of the fan operation. Axial flow blowers have the characteristics of compact structure, small size, light weight, good load adjustment, wide application range, small blower rotational inertia, and easy motor starting, so they are widely used in large and modern blast furnaces. China has widely adopted axial flow blowers in blast furnaces above 500m3, and has accumulated certain experience in manufacturing and operation.
Magnetic levitation blower
Magnetic levitation blower is a type of turbine using magnetic levitation bearings. Its main structure is that the blower impeller is directly installed on the extended end of the motor shaft, and the rotor is vertically suspended on the active magnetic bearing controller. It does not require a speed increaser and coupling, and is directly driven by a high-speed motor. The core of the single-stage high-speed centrifugal blower with frequency converter is magnetic levitation bearing and permanent magnet motor technology. The main technical features of magnetic levitation blower are:
(1) High-efficiency impeller: The high-efficiency impeller adopts three-dimensional flow design, and the five-axis machining technology ensures the manufacturing accuracy of the impeller.
(2) Magnetic levitation bearing: no mechanical wear, low energy, and semi-permanent life.
(3) Integrated structural design: The fan impeller is directly installed on the motor shaft end, integrated with the control system, and installed in the box, with a simple and concise structure.
(4) Easy installation and maintenance: No lifting equipment and high space are required, no special foundation is required, maintenance is convenient, and the capital construction cost of the machine room is saved.
(5) Modular system design: According to different user flow rates, multiple blowers are allowed to work in parallel, with a wide adjustment range and strong flexibility.
Advantages of magnetic levitation blower:
(1) Energy saving and high efficiency: The use of magnetic levitation bearings has no contact loss and mechanical loss, and realizes high-speed stepless speed regulation.
(2) High system integration: It has imported filters, cooling systems, fully automatic anti-surge systems, power outage and fault protection systems, etc., which brings safety, convenience and reliability to operation.
(3) High cooling efficiency: The cooling system adopts an external condenser, which can effectively protect the fan system and realize the start and stop of the fan at any time.
Single-pole high-speed centrifugal blower
Single-pole high-speed centrifugal blower is a product developed in the 1990s with the application of "three-dimensional flow theory" in the design of centrifugal compressors and blowers. The single-pole high-speed centrifugal blower adopts the three-dimensional flow design theory in its design, which makes the efficiency of the single-pole centrifugal blower reach more than 82%, which is far superior to the multi-pole centrifugal blower. The structure adopts an axial air inlet guide vane adjustment device. Under constant pressure, the flow rate is adjusted to 65%~105% of the rated current, and the single-unit flow rate adjustment range is 45%-100%, which makes it more efficient even under low-load conditions. This is an advantage that low-speed multi-pole blowers and Roots blowers do not have. Due to the characteristics of small size, light weight, high efficiency, energy saving, wide performance range adjustment and high level of automation, the single-pole high-speed centrifugal blower is currently the mainstream product of aeration blowers in the sewage treatment industry.