Three-layer noise reduction drainage pipe and manufacture method thereof

Abstract

The invention discloses a three-layer noise reduction drainage pipe, which comprises a drainage pipe body, wherein the drainage pipe body is a three-layer co-extrusion composite pipe formed by an impact-resistance outer layer, a noise reduction middle layer and an impact-resistance inner layer through co-extrusion. The noise reduction middle layer is a sound-absorbing middle layer or a sound insulation middle layer made of expandable polyvinyl chloride composition materials. The above layers are prepared with the following materials. The impact-resistance outer layer is made of polyvinyl chloride resin, chlorinated polyethylene, dibasic lead phosphite, tribasic lead sulfate, calcium stearate, lead stearate, paraffin, PVC processing and modifying agent, active light calcium carbonate, titanium dioxide and dioctyl phthalate. The sound-absorbing middle layer is made of polyvinyl chloride resin, chlorinated polyethylene, lead salt stabilizer, calcium stearate, stearic acid, paraffin, dioctyl phthalate, active light calcium carbonate and barium sulfate. The sound insulation middle layer is made of polyvinyl chloride resin, methacrylic ester polymer and inorganic foaming agent. Compared with the outer layer, the impact-resistance inner layer comprises the same components with the outer layer, except that PVC is adopted instead of polyvinyl chloride resin. The noise of the drainage pipe can be effectively reduced and the intensity of the drainage pipe is enhanced.

Description

technical field [0001] The invention relates to the field of pipelines, in particular to a three-layer noise-reducing drainage pipe and a manufacturing method thereof. Background technique [0002] Living in a world of sound, if the surrounding sound is too loud, it becomes noise. Every household has water pipelines. The sound of drainage in daily drainage pipes is one of the noise sources. Noise makes people upset, distracted, anxious, and easily anger, hearing damage, and affect people's cardiovascular and nervous systems, especially in middle and high-rise buildings. In the dead of night, people wake up from sweet dreams, affecting sleep, study and work, etc. The damage to people is well known. of. [0003] According to the installation position, the drainage pipe is divided into a drainage horizontal pipe and a drainage vertical pipe. The water discharged from the sanitary ware to the horizontal pipe causes the impact of the water body and the horizontal pipe wall to ge...

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Problems solved by technology

[0003]According to the installation position, the drainage pipe is divided into a horizontal drainage pipe and a vertical drainage pipe. The water discharged from the sanitary ware etc. goes to the horizontal pipe, causing the impact of the water body and the horizontal pipe wall At the same time, the hydraulic jump in the drainage horizontal pipe and the pressure fluctuation in the horizontal pipe cause the water seal to bubble and generate noise; the water flow forms a rotating water film layer and air plug flow during the straight down process of the drainage riser, and then The sharp change of these two states makes the air pressure in the standpipe fluctuate rapidly and make noise. At the same time, the water flow collides with the wall of the drainpipe, which also causes vibration noise. The drainage noise generated by the horizontal drainage pipe and the vertical drainage pipe is just It is the most common source of noise. For this reason, relevant technical personnel in the industry have been developing the noise reduction problem of drainage pipes, but there has been no good solution. With the rapid development of industrial buildings and residential buildings in China, drainage pipes The demand has increased greatly. It is very important to summarize the solutions to these problems in order to ensure that the drainage pipes can not only maintain the physical properties of the strength that meet the standard requirements, but also have the function of noise reduction, and at the same time improve the cost performance of the drainage pipes. the meaning of

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