Spring vibration dampers _ _ Huaneng Pipeline Equipment Figure Compound shock absorber damping spring

Recently my company Huaneng applicable norms our vibration dampers also made a relevant understanding. This special vibration dampers will use our standards and applicable specifications published as follows: 1. The vibration dampers should be manufactured in accordance with the requirements of this standard. 2. The shock absorber damping material is silico-manganese spring steel 60Si2Mn (y) 249-8A1. 3. The vibration dampers misalignment of the two mounting holes should not exceed I mme 4. vibration dampers should be galvanized, and by the dehydrogenation process. 5. The vibration dampers surface should not have cracks and scratches and other defects. 6. shock absorber damping technology by manufacturing a wide acceptance inspection department and issued a certificate. 7. The shock absorber damping characteristics and dimensional inspection, sampling each batch lUr, but each type not less than five. } 00% visual inspection performed. Inspection process if found defective product, you should double sampling retest. Vibration dampers retest still has failed, after the elimination of defects by the manufacturer, submission and acceptance of new children. Rated working load and load test, the length of the compressed deviation shall not exceed the load brigade plus 8 hours, measured permanent deformation, its value should not be warped values ??tested before the test shock absorber damping. The main control method blower noise damping spring shock absorbers and sound insulation, vibration isolation technology. Blowers equipment noise blower equipment mainly from two types: centrifugal blower equipment and displacement blowers devices. ① centrifugal blower, also known as turbine blowers rely on the interaction between the rotor blades and airflow mechanical energy into the gas pressure and kinetic energy. ② positive displacement blowers, by changing the volume of the rotor, the mechanical energy is converted to gas pressure and kinetic energy. Compared with centrifugal, positive displacement blowers with a head high flow resistance by small impact, stability, etc. for the wind. According to the structure of the rotor displacement blowers are divided into Roots blowers and leaf blowers. Noise blower up to 100 a 130dB, mostly broadband spectral characteristics, it is one of the most harmful noise equipment. Noise level and spectral characteristics of the different types of blowers produce different noise and radiated portion but substantially the same. Noise blower including aerodynamic noise and mechanical noise, mainly in aerodynamic noise. Aerodynamic noise radiated from the main intake and exhaust ports. Mechanical noise is mainly radiated from the motor, the chassis and the wall out by radiation solid foundation vibration noise also. Aerodynamic noise generated by the rotation of the vortex noise and noise components. When the rotation of the impeller blower, periodically squeezing gas, causing muddy around the impeller gas pressure pulsation in the form of acoustic radiation to the impeller, resulting in periodic intake and exhaust noise, that is, rotation noise.