Vibration and Vibration Modification of Vertical Centrifugal Pump
Domestic large-scale vertical centrifugal pump in the course of operation, there vibration, often up and down the bearing fever, damage, and even pump shaft and bearing connections wear. Pump instability, affecting the normal water supply, the need for its damping control.
First, the pump vibration analysis
1, domestic vertical pump 28SLA-10 is a direct transformation from the horizontal pump. The vertical height between the motor base and the pump base is 4.3m and the drive shaft weighs 3t. Compared with the horizontal pump, it adds a length of 3752mm diameter 140mm intermediate drive shaft. In the structure, in addition to the middle drive shaft with a bearing, without any modification (Figure 1). The four pumps long-term operating pressure of 0.7 ~ 0.85MPa. In the high head, flow conditions, such a high center of gravity, high-quality system of high-speed rotation, the centrifugal force is great, will cause greater vibration of the unit. Coupled stent and pump out of the water connection stiffness is not enough, resulting in a large displacement of the pump and the connector. Displacement of the pump during operation results in a change in the bearing condition of the bearing. As the vibration increases, it is easy to generate heat. If the correction of displacement pump to improve bearing stress conditions, can reduce the vibration of the system.
2, rigid connection between pump and drive shaft. Due to manufacturing and installation reasons, the pump shaft is concentric with the drive shaft during operation, causing the pump to vibrate. The vibrations generated by motors, transmission shafts and other sources are also directly transmitted to the pump to form a superposition of vibrations to further increase the vibration of the pump. In addition, this rigid connection to increase the water pump bearing the external force, resulting in easy to heat the bearing, affecting the pump shaft.
Second, the transformation of the situation
For the above reasons, we have taken the following two steps to transform.
1, to strengthen the pipeline stiffness. Taking into account the more difficult for the pump to strengthen, take the outlet pipe in the pump welding "stiffener" approach. Along the direction of inlet and outlet water, flanges at both ends of the connection pipe between the outlet pipe and outlet valve at the outlet of the water pump are welded with 8 steel plates with a thickness of 32mm and a width of 100mm. Increase the stiffness of the steel pipe to reduce the amount of deformation, resistance to pump displacement. After measuring, stiffened, the displacement of pump A point dropped to 0.35mm.
2, the transformation of the transmission system. In order to reduce the motor, the vibration of the transmission shaft is transmitted to the water pump, and the rigid connection between the water pump and the transmission shaft is changed to the elastic connection. Use GB4323-84 elastic sleeve pin coupling, the maximum compensation displacement of 0.6mm, compensation angle of 1 ° 30 '. In this way, the vibration of the motor and drive shaft can be compensated by the flexible coupling, and the vibration can not be directly transmitted to the pump.
Third, the transformation results
After the transformation, measured by the vibration of the pump before the transformation from 4.3cm / s reduced to 1.48cm / s. According to the vibration intensity standard ISO2372-1974 can determine that the pump is running in the best area. At the same time, the pump runs smoothly, the bearings only need normal maintenance, and the shaft of the pump is worn out, indicating that the reform is successful.
Rutile Titanium Dioxide is used in coatings, plastics, paper, printing inks, chemical fiber, rubber, cosmetics and other industries. It has a high melting point and is also used to make refractory glass, glaze, enamel, clay, high temperature resistant laboratory utensils, etc.
At the same time, titanium dioxide has a good UV shielding effect, and is often incorporated into textile fibers as a sunscreen. Ultra-fine titanium dioxide powder is also added to sunscreen cream to make sunscreen cosmetics.
Titanium dioxide is not only used as a coloring agent in the rubber industry, but also has the functions of strengthening, anti-aging and filling. Titanium dioxide is added to white and colored rubber products. It is resistant to sunlight under sunlight, does not crack, does not change color, has high elongation and is acid and alkali resistant. Titanium dioxide for rubber is mainly used in car tires, rubber shoes, rubber flooring, gloves, sports equipment, etc., generally anatase type. However, when used in the production of automobile tires, a certain amount of rutile products are often added to enhance the anti-ozone and anti-ultraviolet capabilities.
Rutile titanium dioxide
Rutile titanium dioxide
Titanium dioxide is also widely used in cosmetics. Because titanium dioxide is non-toxic and far superior to lead white, almost all kinds of fragrant powder use titanium dioxide instead of lead white and zinc white. You only need to add 5%-8% of titanium dioxide to the fragrance powder to get a permanent white color, making the fragrance smoother, having adhesion, absorption and hiding power. In gouache and cold cream, titanium dioxide can weaken the greasy and transparent feeling. Titanium dioxide can also be used in various other spices, sunscreens, soap flakes, white soap and toothpaste.
The glaze made of titanium dioxide has strong transparency, low quality, strong impact resistance, good mechanical properties, bright colors, and is not easy to be polluted. Titanium dioxide for food and medicine is titanium dioxide with high purity, low heavy metal content and strong hiding power.
Rutile Titanium Dioxide,Titanium Dioxide Rutile Grade,Rutile Titanium Dioxide,Tio2 Titanium Dioxide Rutile
Henan Shunbang Chemical Industry CO.,Ltd , https://www.suspensionpvc.com