The analysis about the central gear ' s mentions impact on the flow pulsation of the five poles of the external meshing gear integral pump 中心轮齿数对五极外啮合齿轮复合泵流量脉动的影响分析
With the advance of frequency conversion technology , the effect of frequency conversion technology on regulation of pump flow is acknowledged by companies 摘要随着变频技术的发展，它在泵流量调节方面的作用越来越受企业认可。
The pump transport mechanism of mortar pump is core of mortar pump technique , and it is the key of technic problem on well - proportioned flux of mortar pump 砂浆泵泵送机构是砂浆泵技术的核心，是保证砂浆泵流量均匀性的技术关键。
Eventually with the optimizing method , primarily to the maximum flow , this paper makes an account of the researches on the optimum parameters of the gear geometry of gear pumps 最后利用优化方法，以齿轮泵流量最大为目标函数对轮齿的齿形参数进行了优化设计。
2 . the flux characteristics of ordinary helical gear pump are lucubrated by theory for the first time , on this condition the selective qualification of the helical gear pump is gained 首次对普通斜齿齿轮泵流量特性进行了深入的理论研究，在此基础上研究了全齿廓啮合斜齿齿轮泵流量特性，首次得到了完全消除斜齿齿轮泵流量脉动的螺旋角的选择条件。
In the mode using constant rate water pump , pumps are put to run atfull capacity in all operation cycles , with no means for water flow rateregulation attached , incurring significant waste of electric power 高位水箱造价较高，并且需要增加楼房的设计强度，增加了投资成本。恒速泵打水总是满负荷运转，不能根据用水量的多少调整泵流量，因此浪费电能。
Then a formula about flow of the gear pump and the coefficient of engagement overlap to find is obtained by area method . through analysis contact ratio and overlap ratio has the effect on the volume oil and the flow pulsating ratio 然后采用面积法求得齿轮泵流量与齿轮啮合重合系数的关系式，研究了齿轮啮合重合系数对齿轮泵困油和流量脉动率的影响。
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 根据齿轮泵流量脉动的检测要求，采用新的测试方法和手段，建立了中高压齿轮泵性能测试装置，并对样机进行了性能测试。
As external gear pump has the most serious problem of flow pulsation , how to analyze the flow pulsation of gear pump and to optimize the construction parameters of gear pump is especially important for the design and performance improvement of gear pump 在液压泵中,以外啮合齿轮泵的流量脉动最大,因此对齿轮泵流量脉动进行分析,以减小流量脉动为目标,对齿轮泵的结构参数进行优化设计,从而为齿轮泵的设计及齿轮泵性能的提高提供理论基础。
In chapter 3 , the pressure pulse under the two situations of the system with and without damper is discussed at the basic of analyzing the flow rate pulse . then the conclusion that the system has filtering effect is drew after adding a damper in it , but its serious in power wastage because of adding a damper 第三章，在分析液压泵流量脉动的基础上，讨论并对比了系统加与不加阻尼两种情况下各自的压力脉动，得出系统中加一个阻尼后，具有一定的滤波作用，但是当流量较大时，由于阻尼的存在，系统功率损失比较严重。
