Ventilating pipe and manufacturing method thereof

Abstract

The invention relates to a ventilating pipe and a manufacturing method thereof. The ventilating pipe comprises a hollow outer pipe body. A polyurethane layer is arranged on the inner wall of the outer pipe body. The manufacturing method of the ventilating pipe comprises the following steps that (a), the hollow outer pipe body and an inner pipe body are provided, the inner pipe body is inserted into the outer pipe body, and a filling space is formed between the inner wall of the outer pipe body and the outer wall of the inner pipe body; (b), polyurethane foam is sprayed into the filling space; and (c), the inner pipe body is taken out after the polyurethane foam is solidified. According to the ventilating pipe, asbestos which is applied in a traditional air pipe is replaced by the polyurethane, and thus better noise reduction and vibration reduction effects can be achieved; in addition, the ventilating pipe is simple in structure and low in manufacturing cost. The manufacturing method of the ventilating pipe is simple, convenient and easy to implement, low in cost, easy to popularize and free of pollution.

Description

technical field [0001] The invention relates to a ventilation pipe and a manufacturing method thereof. Background technique [0002] With the development of the shipbuilding industry and the improvement of ship comfort requirements, the existing engineering ships, especially the ships that must meet the requirements of the ILO International Labor Organization, have a certain impact on the comfort of the working environment of the crew on board, such as vibration, noise, and illuminance. Further requirements. For example, engineering ships with the "HAB" classification symbol have high requirements for noise and vibration. How to improve the living environment on board and solve the vibration transmission and vibration sources on board (such as: air conditioning ventilation and mechanical ventilation piping systems on board, etc.) The excessive vibration and noise generated by the accessories, machines, and wind speed have become an urgent problem to be solved. [0003] At ...

AI Technical Summary

Problems solved by technology

[0003] At present, the method of damping and silencing the excessive vibration and noise generated by accessories, machines and wind speed is to add silencers at the machine outlet, the middle position of the contact and the end, but this method takes up a lot of space and is inconvenient to install. It is supplied on offshore platforms. It is difficult to arrange and use on board

In addition, at present, asbestos layers are applied to some ventilation pipes on ships to reduce noise. Although the asbestos layers play a certain role in reducing noise, the effect is still far from ideal, and the use of asbestos materials on ships has now been banned.

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