Shanghai Dongfeng Pneumatic Butterfly Valve Manufacturing Co., Ltd. has established a marketing network and a perfect service system all over China's major and medium-sized cities to ensure that after-sales service is in place in a timely manner; As the company has followed the tenet of "quality first, integrity first", it has won the reputation of the majority of users, and its market share is getting higher and higher. Its products are sold well all over the country.
According to the characteristics of large adjustable speed water pump, this paper analyzes and studies the vibration transmission of the pump, the selection and calculation of the shock absorber, the selection and calculation of the pipe support, the design and installation of the vibration isolation system, and puts forward the design and installation points of the pneumatic butterfly valve system for large adjustable speed water pump.
With the increasing construction scale of central heating projects, more and more circulating water pumps with high lift and large flow and adjustable speed are used in the first heating station, relay pump station and large heating station. Vibration is the main cause of noise. In order to reduce noise pollution, elastic vibration isolation measures are generally adopted. The author has participated in a number of thermal engineering commissioning, and found that some large water pumps have poor vibration isolation effect, loud noise, pump displacement, and damage to the inlet and outlet soft valves of the pump. This paper takes single-stage, double suction, horizontal split centrifugal pump as an example for analysis and research.
1. Calculation and selection of shock absorbers At present, water pump shock absorbers are generally in the form of shock pads, shear shock absorbers, ball valve shock absorbers, etc. Because the damping pad has the advantages of superior structural stress performance, good stability, good heat and oil resistance, convenient installation, low price, wide application range, etc., it is widely used. Scattering of collector
1.1 Calculation of shock absorber selection The main parameters of shock absorber selection calculation are: allowable vibration transmissibility T and vibration isolation efficiency I (1) Allowable vibration transmissibility T=■ When the damping ratio D=0, the above equation can be simplified as:
T=■ where: T - allowable vibration transmissibility;
F/f0 - frequency ratio of vibration isolation system;
F -- vibration frequency at rated speed of water pump, HZ, f=n/60;
N - rated speed of water pump, r/min;
F0 - vertical natural frequency of shock absorber under static load, HZ;
D - damping ratio of vibration isolation material, general vibration damper D=0.07~0.15, metal ball valve vibration damper D=0.005~0.015. (2) vibration isolation efficiency II=(1-T) 100, where I - vibration isolation efficiency,%;
Many people in our life know that the pneumatic butterfly valve of the water pump is often used in urban water supply, sewage treatment, agricultural water conservancy projects, and the petroleum industry. Our daily life cannot be separated from the water pump. In addition to the impeller inside the pump and several important parts of the pump shaft that need to be protected, the pump must also be equipped with the pneumatic butterfly valve of the water pump. Pneumatic butterfly valve plays an important role in water pump operation, and vibration and noise reduction are indispensable.