DD-type rubber shock absorber applied to mushroom fan noise control

DD-type rubber shock absorber applied to mushroom fan noise control DD DD rubber shock absorber rubber shock absorber with one end by a bolt of steel wire in the end plate, the middle of the cylindrical rubber body composition, compressibility and elongation, structural Simple, easy to install, oil, acid, anti-aging, temperature and other properties, are widely used in electronic equipment, instruments, equipment cabinet, it can also be used for fans, pumps, chillers and so on. Since the complete separation of the upper and lower plate, without an additional annex to subtract off the sound bridge to pass, it is a very useful shock absorber, especially for electronic instruments. Item Type DH d M * 1 rubber hardness 45IRHD (daN / mm) rubber hardness 60IRHD (daN / mm) rubber hardness 70IRHD (daN / mm) Maximale statische Einferung appropriate amount of compression (mm) 1008DD10 10 8 M4 M4 * 10 4.0 7.3 10.3 1.6 2520DD18 25 20 M6 M6 * 18 10.3 18.8 25.0 4.0 2520DD20 25 20 M8 M8 * 20 10.3 18.8 25.0 4.0 2522DD20 25 22 M8 M8 * 20 8.2 15.6 20.6 4.4 2525DD18 25 25 M6 M6 * 18 6.1 11.4 15.7 5.0 2525DD20 25 25 M8 M8 * 20 6.1 11.4 15.7 5.0 2530DD18 25 30 M6 M6 * 18 4.4 8.5 11.1 6.0 2530DD20 25 30 M8 M8 * 20 4.4 8.5 11.1 6.0 3015DD20 30 15 M8 M8 * 20 20.9 30.3 53.6 3.0 3020DD20 30 20 M8 M8 * 20 13.1 22.4 33.1 4.0 3025DD20 30 25 M8 M8 * 20 8.3 14.3 19.5 5.0 3030DD20 30 30 M8 M8 * 20 6.0 11.2 15.0 6.0 3040DD20 30 40 M8 M8 * 20 4.0 7.8 10.3 8.0 4020DD23 40 20 M8 M8 * 23 26.3 49.4 68.1 4.0 4020DD25 40 20 M10 M10 * 25 26.3 49.4 68.1 4.0 4025DD25 40 25 M10 M10 * 25 18.6 34.8 47.6 5.0 4028DD25 40 28 M10 M10 * 25 15.0 27.9 38.3 5.6 4030DD23 40 30 M8 M8 * 23 13.1 24.6 34.2 6.0 4030DD25 40 30 M10 M10 * 25 13.1 24.6 34.2 6.0 4035DD23 40 35 M8 M8 * 23 10.0 18.4 25.8 7.0 4035DD25 40 35 M10 M10 * 25 10.0 18.4 25.8 7.0 4040DD23 40 40 M8 M8 * 23 8.3 15.3 21.1 8.0 4040DD25 40 40 M10 M10 * 25 8.3 15.3 21.1 8.0 4045DD25 40 45 M10 M10 * 25 8.3 15.3 21.1 9.0 5020DD25 50 20 M10 M10 * 25 58.0 109.3 150.7 4.0 5025DD25 50 25 M10 M10 * 25 40.5 75.5 104.5 5.0 5030DD25 50 30 M10 M10 * 25 28.0 51.6 71.2 6.0 5040DD25 50 40 M10 M10 * 25 14.3 26.9 37.1 8.0 5045DD25 50 45 M10 M10 * 25 11.3 21.0 29.3 9.0 5050DD25 50 50 M10 M10 * 25 9.1 17.3 23.8 10.0 6036DD25 60 36 M10 M10 * 25 35.2 65.5 90.3 7.2 6036DD37 60 36 M12 M12 * 37 35.2 65.5 90.3 7.2 6040DD25 60 40 M10 M10 * 25 28.9 53.7 73.1 8.0 6040DD37 60 40 M12 M12 * 37 28.9 53.7 73.1 8.0 6045DD25 60 45 M10 M10 * 25 23.0 42.8 59.3 9.0 6045DD37 60 45 M12 M12 * 37 23.0 42.8 59.3 9.0 6050DD37 60 50 M12 M12 * 37 18.2 34.0 46.9 10.0 6535DD25 65 35 M10 M10 * 25 44.3 82.3 114.0 7.0 6545DD37 65 45 M12 M12 * 37 25.8 47.5 66.0 9.0 6550DD37 65 50 M12 M12 * 37 19.6 36.2 50.2 10.0 7030DD25 70 30 M10 M10 * 25 72.9 135.8 185.4 6.0 7035DD25 70 35 M10 M10 * 25 53.1 105.9 145.9 7.0 7035DD37 70 35 M12 M12 * 37 53.1 105.9 145.9 7.0 7040DD25 70 40 M10 M10 * 25 42.1 78.2 107.9 8.0 7040DD37 70 40 M12 M12 * 37 42.1 78.2 107.9 8.0 7045DD25 70 45 M10 M10 * 25 33.1 61.3 82.3 9.0 7050DD25 70 50 M10 M10 * 25 26.3 49.3 68.2 10.0 7050DD37 70 50 M12 M12 * 37 26.3 49.3 68.2 10.0 7070DD25 70 70 M10 M10 * 25 17.3 32.2 44.7 14.0 7540DD37 75 40 M12 M12 * 37 45.3 84.7 116.8 8.0 7550DD37 75 50 M12 M12 * 37 33.4 62.7 86.6 10.0 7555DD37 75 55 M12 M12 * 37 26.1 49.4 68.0 11.0 8030DD35 80 30 M14 M14 * 35 115.8 219.6 302.1 6.0 8040DD35 80 40 M14 M14 * 35 61.8 115.3 159.7 8.0 8050DD35 80 50 M14 M14 * 35 40.9 77.3 106.1 10.0 8050DD37 80 50 M12 M12 * 37 40.9 77.3 106.1 10.0 8060DD35 80 60 M14 M14 * 35 27.4 51.5 70.6 12.0 10040DD44 100 40 M16 M16 * 44 118.8 215.6 296.9 8.0 10050DD44 100 50 M16 M16 * 44 71.4 128.6 178.6 10.0 10055DD44 100 55 M16 M16 * 44 58.5 109.6 151.1 11.0 10060DD44 100 60 M16 M16 * 44 51.0 92.3 128.8 12.0 10075DD44 100 75 M16 M16 * 44 32.8 58.2 80.6 15.0 Suzhou Seles Shock Absorber Technology Ltd. Tel: 0512-68786858 Mobile: 18551266677 Company Website: www.sailaisi.com Address : Riverside Road, Suzhou New District 1701 Noise Control Method One: active noise reduction. Active noise reduction is the use of computer technology, based on the noise of the sampling frequency, amplitude, period, etc., and generates near synchronous inverted signal superimposed to achieve the purpose of noise control. Currently, this type of noise control method is not mature enough, in the research and development stage. Noise Control Method two: passive noise reduction. Most noise reduction methods are passive noise reduction. In accordance with the use of materials and parts can be divided into vibration noise control, acoustic noise control and soundproofing noise control. In most cases, a variety of methods are usually combined use. According to the current material technology and construction techniques, basic can control any noise. Beijing Branch source of sound noise control engineering and technology Equipment Co., Ltd. adopt measures to control the sound output noise source, the control of noise propagation and reception, to give it the desired acoustic environment, namely noise control. Using a variety of noise control methods can receive different noise reduction. As ordinary gear mechanical transmission parts changed elastic sleeve gear, it can reduce noise 15 to 20 db; caulking into welding, forging into the friction pressure processing, generally 30 to 40 db noise reduction. Select control measures and reasonable measures to control noise is based on the cost of noise control and noise standards to allow the relevant factors, labor productivity such as a comprehensive analysis determined. Control of environmental noise control technology is the basic means. Administrative measures and proper planning are also very important. Noise control technology basically all of the noise problem can be divided into three parts: source - transmission - receiver. Thus, the general noise control techniques are divided into three parts to consider. The first is to reduce the sound source of the noise, if you can not do, or can do but not the economy, is considered to reduce the spread pathway. As the above scheme still meet the requirements of noise control or uneconomical may consider the recipient's personal protection. (1) sound source control reduces noise source itself is the ultimate solution; (2) the transmission of noise control; (3) the absorption: the main use of sound-absorbing material or absorbent structure to absorb acoustic energy; (4) Noise: with sound shield block, isolate, is one of the most effective measures to control the noise; (5) muffler: muffler is the use of mufflers to reduce the spread of sound in air.