Low Ripple Gear Pump Mechanism Analysis And Optimization Design

The structure and craftwork of gear pump is the most simple among the other hydraulic pump, and the aspects of its price, dependability, life-span, anti-contaminativity, self-absorb ability have more strong advantage too, so gear pump are used widely in fluid drive and cybernetic technology, such as lathe machine, light industry, agriculture, metallurgy, mining, building, ships, airplanes , cars , petrochemical machine and soon on .But gear pump also have some defects ,the strong flow and press pulse ,the low of dynamic capability, the high noise ,the unchangeable output. Among them the flow pulse is more standing-out, which is the main reason of its not more widely used .because high flow pulse will lead to the worse of the smooth movement of hydraulic motor and pipe , also cause pressure pulse which lead to a high noise ,and give the destructive damage to the axial ,bearing ,valve, the connect of pipe etc. How to make the flow pulse low has become the research of scholars of many country.On base of the cases above , how to reduce the flow pulse of gear pump and preserve its good characters are presented in the paper .The primary method to solve the problem is to replace the spur gear with helical gear in the pump ,which is base on the theory that the swing of a periodical cure will decrease on the case of the add of the same cure with some phase difference. Through the way the goals of reducing the flow pulse of gear pump and preserving the good characters can be achieved at the same time .At first, on the base of the analysis of the mechanism of the helical gear pump,the paper try to find the relationship of the helical gear pump flow pulse with its corresponding parameters , give the solution of the problems brought by the replace of spur gear to lay the firm basis for the structural design of helical gear pump .The following is the detail design of the pump, and a optimum mathematical model are presented to mostly reduce the helical gear pump flow pulse .And at last the measurement of helical gear pump flow pulse has been presented , which include how to measure the flow pulse and the validating the theory mentioned before and to try to the solve the problems happened during the process . And the results have been shown that the theory is right.With the research in the paper succeeded it would be certain that the helical gear pump would replace the spur gear pump now widely existed in the market and also could replace the other type of hydraulic pump in some areas , which surely greatly decrease the cost of manufacture and advance the development of technology .The importance is undisputable.