Can be supplied as single stage, two stage and three stage.Capable of creating Vacuum upto 0.5 torr.Mended in single stage, two stage and three stage.Capable of creating Vacuum up to 0.5 Torr.The products we provide are very stable to and ensure durability in affordable prices. With the help of our capable employees we are able to create optimum-grade products made to ensure the satisfaction of our clients. The new formula proposed here, coincoided well with the test results.After setting up a perfect industry, we are able to provide our clients with our best-in-class Three Stage Graphite Ejector made by the gifted hands of our work force and skilled engineers. The authors proposed a new formula for ejector design, based on the results of the experiment, theoretical formula and empirical formula which have been used for the design. But in reality, it is very difficult to calculate the characteristics curve of a volute pump or turbine pump, therefore, it is not easy to find out the most economical operation point of them.
It is desirable that the pump, regardless its type, is operated at the most effective operation point. The water effeciency and the character of vacuum reduction in the suction pipe were studied for designing ejectors. This report is one of the reports in continuous series, preceded by The repart of the port and harbour research institute No.4 vol.4 'Study on the Pumping Efficiency of Jet-water Ejector.' For both experiments, reported here and in the former paper, the same apparatus was used, but in the experiment reported here, the experimental condations such as ratios of nozzle area to pipe and throttle area, vary more widely than the last time, and the diffuser has uniform pipe diameter in some length, (the former experiment was carried out without it). In this report, the authors intend to present the results of practical experiments with the large ejector experiment apparatus drived with flesh water and tranport the flesh water. But, no practical method to design ejector devices if available, at present. In this case, the ejector is no wear, no damage, and some effective at all.Īs described above, there are many applications of efectors in harbour construction works. Another application of an ejector is a samprehandling pump.
Then, the soil can be tranported longer distance easily. In this case, it is desirable to provide a ejector at the middle of the discharge pipeline and to increase the discharging pressure inb the pipe. Since frictional loss is proportional to length of discharge pipe, the total frictional loss is very large and there will be pipe blocking for sedimentation of the soil, when the soil is transported through long distance by pipeline. Also, soil must be transported long distance when a new port is digged into land, and there is no place to damp the soil near the digging area. When large area is reclamed, soil must be transported longer distance, from dredging area to reclaiming area. The new dredgers in this type are working some places in Japan. In such a case, the sand can be taken effectively and economically ejecting out it from under water by deep dredging machine with ejector at a mouth of the suction pipe, or by cutter suction dredger with vacuum reducing ejector at suction pipe. However, sand suitable for reclamation lay more than 20m below the water level. The above descrived reason, the economical maximum dredging depth for ordinary dredgers, is less than about 20m below the water level.
Therefore, the dredger pump must be operated at the lower mud content, for continious operation of it. But, generally in accordance with the increase of dredging depth, the suction vacuum of the pump become more larger,and it couses wearing of a runner of dredging pomp due to cavitation and the operation has to be frequently interrupted to repair the weared runner. The pomp dredgers have become more larger recently, and the maximum dredging depth is more than 30m below the water level. Sometimes, people has to dredge the sand lying in deep place. The most important things are to dredge and transport soil efficiently and economically. This paper presents the test results of a water ejector and new procedure to design it.Ī water ejector is applicable for dredging sand in deep place and also for incleasing pressure in suction pipe and preventing cavitation in a pump.įor reclaiming land for a seacoast-industrial-area, and constructing the port facilities for it, a large amount of soil must be dredged and transported. Machinery Division Chief of Machinery Division Jin MATSUDA,Motoi KONDO,Teruaki MORIGUCHI