Gear pump hydraulic system development

In order to adapt hydraulic system is toward fast response , small size, low noise direction, gear pumps in addition to actively take measures to maintain its low-pressure dosing system , lubrication system dominance , but still need the following directions:
( 1 ) low flow pulsation : flow pulsation will cause pressure fluctuations , causing the system to generate vibration and noise, which is associated with the requirements of modern hydraulic systems are inconsistent . Reduce flow pulsation method , in addition to the previously described measures, Saikawa complex multi- gear pump is a trend.
( 2 ) high-voltage technology : higher pressure is required by the system , but also gear pumps and piston pumps, vane pumps competition must be addressed . The high pressure gear pump of the work has made ​​great progress , but by its own structural limitations , in order to further improve the working pressure is very difficult to be developed a new structure of the gear pump . In this regard, by a plurality of composite gear pump gear will have a great advantage, the country has many researchers has conducted some research, and achieved remarkable results pull tight plastic seals.
( 3 ) Low noise: abroad have long been "quiet" pump said. As people's awareness of environmental protection , the gear pump noise requirements have become more stringent. Gear pump noise is mainly composed of two parts , part of the process of meshing gear mechanical noise generated in the other part of the trapped oil hydraulic pressure generated by the impact of noise. The former gear precision machining and installation , while the latter mainly depends on the thoroughness of the pump unloading . For external gear pump , to achieve complete unloading is very difficult, thus further reducing pump noise subject to certain restrictions . In this regard, due to internal gear pump has a smooth , non- trapped oil phenomenon , low noise characteristics and attracted universal attention , especially linear conjugate tooth profile of the internal gear pump because of its smooth operation, low noise, and much favor , is becoming the focus of research .
( 4 ) Variable Displacement: gear pump displacement can not be adjusted , limiting its scope to use the same . In order to change the gear pump displacement , domestic and foreign scholars have done a lot of research work, and made ​​a lot of research results. For variable displacement gear pump has a lot of aspects of the patent , but really very little can be converted into products . Balanced compound gear internal gear pump can be adjusted by changing the speed of the pump displacement meters , but the specific methods and structures to be studied further tamper seal.
( 5 ) Large displacement : For some systems require fast moving rice , said large displacement is required. But conventional gear pump displacement increased by many factors. This regard , balanced compound gear pump has significant advantages , such as a table three composite idler gear pump displacement equivalent to 6 units with a single pump displacement dimensions .