Plunger chestnut is a commonly used power source of hydraulic system. The existing plunger pump, whether it is an axial plunger pump or a radial plunger pump, is composed of the working manifold. Regardless of the complexity of the pipeline, it can be divided into two types: series pipeline and parallel pipeline. The total resistance of the series pipeline should be equal to the sum of the resistances of the various pipeline sections; the resistance of each branch pipe in the parallel pipeline is equal; the flow of the junction (diversion or merge) of each pipeline should be balanced.
In the ventilation system, if the resistance of the parallel branches is unbalanced, the air cannot be delivered according to the predetermined air volume value. That is, the actual air volume of the branch with low resistance is larger than the predetermined air volume, and the actual air volume of the branch with high resistance is smaller than the predetermined air volume. Therefore, the resistance of the pipe section must be adjusted, generally the following measures can be taken: valve adjustment. By changing the valve opening, adjust the pipeline resistance.
However, for the actual commissioning of a multi-branch ventilation system, it must be adjusted repeatedly to complete the test and achieve the expected flow distribution.
D Pipe diameter before adjustment, mm; resistance of branch pipe before AP adjustment, pa; resistance of branch pipe after AP 'adjustment, Pa. In general, the resistance difference between two parallel branches does not exceed 1 ~ 15%, and the above resistance may not be necessary balance.
3.3 System division The exhaust of the same type of work should be combined into an exhaust system as much as possible, but it should be noted that the exhaust points should not be excessive, otherwise the exhaust effect of each exhaust point should not be balanced. The exhaust of the following processes cannot be combined into one system: the exhaust of the grinder and cloth polishing machine cannot be combined, the exhaust of the chemical and electrochemical parts should be separated from the exhaust of the grinding, polishing, sandblasting, etc .; The exhaust air cannot be combined with the exhaust air of the acid tank; the organic solvent degreasing should have a separate exhaust system, and consider fire prevention and explosion prevention measures.
3.4 Air duct layout and type air duct layout are directly related to the overall layout of the ventilation system. It has close professional relations with technology, civil engineering, electrical, water supply and drainage, etc., and should be coordinated and coordinated with each other. The air duct layout should meet the following requirements: Since the inner wall of the exhaust pipe will produce condensate, the air duct should have a drainage slope of not less than 0.005, and drainage measures should be taken at the lowest point of the air pipe and the local part of the fan.
For the exhaust system of chemical and organic degreasing tanks, the positive pressure section of the air pipe should not pass through other rooms.
Due to the light weight, smooth surface, easy production and good anti-corrosion performance of the hard polyvinyl chloride, the air pipes that exclude harmful gases from the process tank are generally made of hard polyethylene plastic plates.
In order to reduce the resistance of the system, the pipeline should be arranged with short pipelines and few turns. Try to avoid the use of right-angle elbows and sudden changes in cross-section. When the cross-sectional size of the air duct is large, in order to make full use of the building space, rectangular air ducts are usually used. The closer the aspect ratio is to 1, the better.
In order to maximize the use of plates and realize the mechanization and factoryization of the production and installation of air ducts, the unified scale should be used as much as possible to make the pipes stereotyped.
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