Ductile Manhole Cover is made of ductile;
we make the manhole cover on BS EN124, Mainly our products are A15, B125, C250
and D400, sometimes also make it E600 and F900 in case of need. For A15, B125,
C250 and D400 ductile manhole covers to be used in Green belt, Pavement, Auxiliary
road, Main road and Express way. We make ductile manhole covers all by
producing line, the quality is very good, and we warmly welcome customers all
over the world to do business with us.
Ductile Manhole Cover,Ductile Iron Manhole Cover,Ductile Iron Cover And Frame,Ductile Iron Cover Zhoushan Runchun Import & Export Co., Ltd. , https://www.en124casting.com
Automotive water pump At present, China has begun to study the reliability and life of the automotive pump is the first one. 1, due to high engine speed, and changes in operating conditions, the coolant temperature is high (about 90 degrees, the limit of 110 degrees), increasing the design of automotive cooling pump more difficult. 2, car cooling pump, the current domestic manufacturers do not pay much attention to the efficiency of the pump, in order to reduce costs, the general pump efficiency is about 30%. I know Japan's Honda, Mazda's automotive cooling pumps are 42-46% efficiency. Open impeller efficiency is very high, the manufacturing process is also very good. 3, car cooling pump should be said that one of the special applications of centrifugal pumps. Its design concept and principle are the same as those of centrifugal pump, but considering the special requirements of cylinder structure, technology and automobile engine, we can find that the design method of automobile pump is different from that of common centrifugal pump, and the width of impeller is wide The design of the volute shell is not completely in accordance with the design of the volute of the ordinary centrifugal pump. The current structure of the impeller used by foreign enterprises are more stamping impeller, low cost, high efficiency; leaf structure varied, with circular blades, straight blades, but also after bending blades and so on. 4, for the reliability of automotive pumps I think the first thing to consider is the axial force balance and cavitation performance. These two points in the design must be rigorous calculations, we usually use CFD calculations and forecasts. In this respect, we have cooperated with the manufacturers in Chongqing to start the research, and we have achieved some achievements. We have also developed some products. 5, because imports generally have a system pressure of 0.98MP, cavitation performance improvement, the easiest way is to increase the import of impeller, of course, the placement of the blade and the inlet angle of the impact of cavitation performance is also greater. 6, shaft seals, bearings for better reliability, are generally imported. The reliability of these delicate parts is even more important. 7, the pressure difference for the car pump generally require 140kp, according to our experience, manufacturers are designed at 200kp above, this is not taking into account the system piping characteristic curve requirements or conservative design? If you can drop to 14KPa, so you can reduce Shaft power, improve engine efficiency. 8, to study and design of automotive pumps, you must test the characteristics of the vehicle cooling system curve, so as to be reasonable and scientific design.