Shanghai Dongfeng Electric 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 water pump, the selection and calculation of electric butterfly valve, the selection and calculation of pipe support, the design and installation of vibration isolation system, and puts forward the key points for the design and installation of electric butterfly valve system of 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 electric butterfly valve At present, the electric butterfly valve of water pump generally adopts several forms, such as shock pad, shear electric butterfly valve, butterfly valve electric butterfly valve, 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 Selection calculation of electric butterfly valve Main parameters for selection calculation of electric butterfly valve 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 electric butterfly valve under static load, HZ;
D - damping ratio of vibration isolation material, general electric butterfly valve D=0.07~0.15, metal butterfly valve electric butterfly valve 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 electric butterfly valve of water pump. The mechanical equipment of 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 installed with the electric butterfly valve equipment. The electric butterfly valve plays an important role in the operation of the water pump, and vibration and noise reduction are indispensable.